DE2002087A1 - Electrode coil for fluorescent lamps or the like. as well as method and device for producing such a helix - Google Patents

Description

Düsseldorf, January 16, 1970

Westinghouse Electric Corporation,
Pittsburgh, Pa., V. St. A.

Electrode filament for fluorescent lamps or the like and a method and device for production such a helix

The present invention relates to the manufacture of serpentine or coiled items such as filaments for electrical Lamps, in particular on heat-resistant electrode wire coils for fluorescent lamp electrodes, which can be handled and shipped en masse without getting caught in one another. The invention also relates to methods and apparatus for making such tangle-free wire coils and to an improved one Mounting arrangement for light bulbs ο. Like. In which a filament coil according to the invention is used.

Filament coils for fluorescent and incandescent lamps are currently usually manufactured in such a way that a tungsten wire is wound on a mandrel made of a different metal, such as iron, the resulting structure is cut into sections of the desired length, and the mandrels are then loosened so that the desired ones individual tungsten wire coils remain. So-called '• barrel or barrel section-free ¹¹ electrode coils, as they are currently used as cathodes for fluorescent lamps, have a coiled tungsten core wire around which the fine tungsten wire is loosely wound so that it forms a basket-like arrangement through which the capability of the coil is increased to take up material suitable for electron emission. As a result of the

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small diameter of the tungsten core wire, a ridge is formed, when the wire is cut during the manufacture of the helix. The ends of the loosely guided ends with the formation of burrs Core wires protrude beyond the ends of the helix so that they attack the turns of other helices and get caught in them, as soon as the coils are filled into a container and touch each other. In extreme cases, this entanglement can go so far that it is possible, the entire contents of the container with hundreds of spirals by simply grasping one end of a single helix and then pulling on it.

Because of this tendency of such, which lies in the nature of the matter run-free or barrel-free fluorescent lamp filaments, yourself hooking together, it has been extremely difficult to find a satisfactory working device for the supply of the coils to build that automatically separates the filaments and feeds them to a machine for assembling the lamp parts. The coils will accordingly manually separated from one another and also fed to the assembly machine by hand. This activity is time consuming and tiring and is a major contributor to the cost of the lamps. In addition, a large number of the finished coils must be sorted out as scrap during the manufacturing process and in connection with the inspection because it is practically impossible is to free them from their mutual entanglement. The percentage of rejects is therefore very high and triggers thereby also contributing to the increase in lamp manufacturing costs.

The object of the present invention is to create a very economical one and practical solution of the cited entanglement problem and thus in particular a reduction in manufacturing costs of fluorescent lamps.

Accordingly, a helix with a plurality of turns arranged at a distance from one another is characterized according to the invention by at least one thickening made of molten material integral with the helix and thereby forming one end thereof.

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ORIGINAL INSPECTED

In the case of the production of a luminescent material free of barrel or barrel areas lamp electrode filament, the ends of the iron mandrel are melted in situ, so that the resulting softened mass accumulations molten iron loosen the tungsten wire windings arranged above it, so that integral thickenings of tungsten-iron wire alloy arise which are united and fused with the corresponding end turns of the tungsten wire. the Thickenings are formed in such a way that the helical turns remain in their original, non-recrystallized state. Since the Thickenings containing tungsten are used to dissolve them and removal of the iron mandrel, the acid used is not dissolved, so that the finished coils at their ends with deformable (ductile) Thickenings are provided which complete the respective ends of the helix * and the separated ends of the Tungsten core wire and the fine tungsten wire wound over it mounting. The finished coils can be processed, checked and dispatched en masse without getting caught or jammed with one another break. The amount of waste generated during manufacture and handling Scrap is drastically reduced, and the coils can be conveniently set up for automatic introduction into the assembly, disconnect machine.

The thickenings from the fused tungsten-iron alloy can be formed on the ends of precut coils that still contain their iron mandrel. Preferably, the separation is carried out ά and thickening of the filaments by passing moved at the same time, a continuous mandrel / coiled wire stock in front of a laser, the laser in timed relation with the wire supply-advance speed is turned on, so that the focused laser beam given the mandrel portion of the wire feedstock to a to a Distance from the free end of the wire and by then exerting an axial pull on the free end of the wire stock after the laser beam has melted the iron mandrel and formed a softened mass of molten tungsten-iron alloy. By suitably setting the wire advance speed, the duration and intensity of the laser beam as well as the point in time and the speed at which or at which

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the end section is removed from the wire stock, non-recrystallized sections of prepared (embryonic), nor the Mandrel containing coils of precisely set length with deformable thickenings at both ends can be generated very quickly. These Sections are then immersed in an acid bath that dissolves the iron mandrels and the sections into finished tungsten electrode coils transforms with thickened ends.

For the automatic implementation of the above procedural steps A device with cam-actuated clamping jaws is used to guide the wire supply past the laser, as well as with cam-actuated jaws Switches for the control of the laser and the excitation of an electromagnetic winding which is the end section of the wire supply withdraws.

To form the tungsten-iron alloy thickenings at the ends of the finished heat-resistant wire coils or as integral components Various methods can be used for a helical guide insert.

In connection with the invention there is a further advantage of an improved thread holder arrangement in which the luminous The length of the filament filament is determined by means of integral thickenings at the ends of the filament, which are provided during the assembly of the filament serve as reference points for attaching the power supply wires to the filament.

The invention is explained below together with further features of exemplary embodiments explained in connection with the accompanying drawing. Show in it;

1 shows, in perspective, on an enlarged scale, a holder of a fluorescent lamp with a holder according to the invention run-free electrode coil provided with thickenings at their ends;

2 shows a side view of the electrode coil before it is connected to the power supply wires and before

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their coating with emission material;

Fig. 3 shows, on an enlarged scale, a cross section through the uncoated coil along the line III-III of the Fig. 2; -

4 shows a partial side view on an enlarged scale

a portion of one used in connection with the manufacture of the helix of Figures 1-3 Wire construction; '·

5 shows a partial view of the wire structure on an enlarged scale 4 after it has been wound onto the iron mandrel to form the continuous wire supply; .

6 shows a side view of a on an enlarged scale cut from the wire stock after the formation of the thickenings at the two ends and prior to the dissolution of the iron mandrel and iron filler wire;

7a-7d are partial side views of a portion of the

Wire stock showing the various steps involved in the simultaneous thickening and separation of an embryonic coil section according to the present Illustrate invention;

8 is a partial side elevational view of one end of the finished non-recrystallized tungsten wire electrode coil after removing the iron mandrel and the filler wire;

χ.

9a-9d schematically show the structure of a mechanical device as well as the associated electrical circuit for the automatic disconnection of a continuously supplied Wire supply into thickened sections of uniform length with the help of a Laser, according to the phases passed through during a cycle;

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Fig. 10 is a perspective view of a corresponding one

the schematic layout of FIGS. 9a-9d Machine for the production of I / Endeln nach the invention;

11 is a phase diagram showing the actuation of the various components of the machine as it passes through a full cycle illustrated in time series;

Fig. 12 is a side view of a somewhat modified one

Possible embodiment of the invention, the wire supply being thickened separately by means of a laser and is cut into embryonic coil sections with the aid of a knife;

13 shows a perspective view of a further possible embodiment of the invention, in which thickenings are formed at the same time at both ends of the pre-cut sections of the wire stock will;

14a-14d side views of a preformed wire helix,

which the various operations according to a further embodiment of the invention for thickening and> oi

^ the short sections of metal wire into the ends of the

Helix is inserted and then melted with the help of lasers to the desired integral to get fused thickenings;

15 is a partial side view of the end of a preformed helix, with which another possibility the thickening is illustrated, after which the end of a motorized wire melted and fusing with the end turn of the coil when the wire penetrates the coil;

000 031 / $ 15 1 _BAD ORIGINAL.

16 ■ "" "is a perspective view of a according to a

filament coil produced in a further modified embodiment of the invention of the thickenings formed as integral components of wire sections inserted into the helix will; and

17a-17b are side views of an enlarged scale

Double coiled filament provided with thickenings and the associated power supply parts of an incandescent lamp holder, the thickenings serving to determine the luminous length of the mounted filament.

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1 shows a holder 10 for a fluorescent lamp. The holder 10 has a glass shaft 11, which at one end into a conical plate 12 and a pump tube 13 passes, which extends into the glass shaft 11 and together with an opening arranged laterally in the glass shaft 11 14 a passage for evacuating and for metering the mercury of the lamp after the sealing of the glass shaft 11 in the Forms lamp bulb. Two power supply wires 16 and 17 are sealed by a pinch foot 15 at the other end of the glass shaft llguided. The two power supply wires go at their free ends each in a clamping bracket 18, with the help of which the ends of a hot cathode are clamped, which is of a non-running Electrode coil 20 is formed from non-recrystallized tungsten wire, which has a layer of a suitable electron-emitting Material E as a mixture of alkaline earth oxides carries.

The two ends of the helix 20 have a pearl-like thickening 21 of molten, deformable metal, which extends over the end face of the helix. The coating material E extends only over the middle section of the helix 20, so that those located in the immediate vicinity of the clamping bracket 18 Turns of the coil 20 are without a coating. Such spirals are referred to as "barrelless" spirals, because they consist of a plurality of spaced turns of the same diameter and thus a spiral of linear course and across the entire length constant cross-sectional dimensions. Such non-running spirals therefore have no major secondary turns and no central helix barrel section, as is the case for double or triple helix filaments applies.

As shown in FIGS. 1 and 2, the thickenings 21 are integral with the end turns 22 of the coil 20, terminating the end turns 22 and being approximately the same size as the outer diameter of the coil. The thickenings 21 accordingly merge into the ends of the helix 20 and close them off. As in enlarged

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3, the helix 20 has a coiled core wire 23 made of a suitable heat-resistant material such as non-recrystallized tungsten, which is surrounded by a winding of fine, loosely wound heat-resistant wire 24 such as non-recrystallized tungsten. The turns of the fine wire 24 enclose the core wire 23 and thereby form a basket-like structure which increases the ability of the coil 20 to accommodate emissive material. When the central region of the coil 20 is coated with the emission material E after the coil has been attached to the lead wires 16 and 17, the emission material E fills the basket-like structure μ formed by the loops of the fine wire 24 wound with play, the windings 22 of the Helix 20 can be bridged in the manner shown in FIG.

To produce the electrode coil 20, the tungsten core wire 23 is paired with a somewhat larger filler wire 25 made of a different metal such as iron, the iron then being chemically separated from the coil without affecting the tungsten core wire. The core wire 23 and iron filler wire 25, which are guided in pairs, form a two-core core structure. The fine tungsten wire 24 is tightly wound around this two-core core structure, so that the wire arrangement 26 of FIG. 4 is produced. The wire arrangement 26 is in turn wound around a wire-shaped iron mandrel 27, so that a structure, referred to below as wire stock 28 %, is obtained in accordance with FIG.

According to the prior art of the wire stock 28 with desired Dipped lengths of cut sections in an acid bath (e.g. hydrochloric acid) containing the iron cored wire 25 and loosens the iron mandrel 27, so that the desired finished coil of the coiled tungsten core wire 23 and the fine tungsten wire 24 loosely running around it remains. As a result of the small Diameter of the tungsten core wire 23 is a smooth separation mechanically not practically possible. Rather, it is inevitable that burrs will remain at the cut ends. Since the Core wire 23 is loosely wrapped around the fine wire 24,

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the ends of the core wire provided with the burr formations stand naturally beyond the ends of the finished helix, so that it the above-mentioned mutual entanglement occurs when the spirals are introduced into a filling opening and processed en masse will.

According to the present invention, this interlocking problem is remedied by removing the ends of the iron mandrel 27 are melted before its chemical removal, so that an integral thickening 21 from a melted deformable Tungsten-iron alloy is formed at both ends of the section of wire stock 28. Since the solution to the iron mandrel 27 and the acid used in the filler wire 25 does not attack tungsten, these tungsten-iron alloy thickenings 21 also remain on the End turns of the finished coil 20 after removal of the pure iron components according to FIGS. 1 and 2 exist.

Melting the iron mandrel 27 releases the softened molten mass Iron the overlying tungsten parts of the wire arrangement 26 so that the ends of the core wire 23 and the fine wire 24 wound thereon unite therewith and by means of the corresponding thickenings 21 are set. The end turns of the finished helix 20 are formed by pearl-shaped thickenings 21 completed, which are essentially smooth and larger than the distance between the turns 22, so that the Problem that it is due to the burr formation provided ends of the core wire 23 in the non-running coils according to the prior Technology can come to mutual entanglements, completely eliminated will. The coils 20 closed at their ends by the thickenings 21 according to the present invention therefore further process and dispatch en masse without the coils engaging in one another and then being able to get caught. Consequently they can be easily separated from one another and transferred to an assembly device by means of a suitable automatic feed device initiate.

Various methods can be used to melt the ends of the iron mandrel 27

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concentrated and controllable heat sources like a focused one Using an electron beam, a plasma torch or a sharply focused oxygen-hydrogen flame, however, is one Laser beam with a view to giving preference to it easily focus on the ends of the iron mandrel with great accuracy leaves.

6 shows a section 29 of non-recrystallized wire stock 28, at the ends of which, according to the invention, integral thickenings of deformable (ductile) tungsten-iron alloy have been formed with the aid of a laser beam. As can be seen, the thickenings 21 are united with the ends of the wire arrangement 26 wound around the iron mandrel 27 and are integral. These M sections have a precisely defined length L and practically represent finished (embryonic) coils, since they only have to be immersed in an acid bath, washed and then dried in order to be available as finished coils.

An essential feature of the invention is to be seen in the fact that the equipment of the wire supply 28 with thickenings and the division into sections 29 at the same time in a single operation can be done. The various stages of such an operation, in which, on the one hand, thickenings are formed at the same time, on the other hand, a separation takes place, are with Fig. 7a - d which are described below.

According to FIG. 7a, the wire supply 28 becomes a laser beam exposed, which at one point on the axis of the iron mandrel 27 is focused, which is located by the desired distance L from the end of the thickening 21, which in connection with the preceding Thickening / separating process at the free end of the wire, stock 28 was formed. The intense heat from the hitting Laser beam 30 is generated, the iron mandrel 27 melts quickly and allows a softened mass accumulation to boil Iron arise, through which the overlying part of the iron cored wire and melt the corresponding parts of the tungsten core wire 23 and the fine wire 24 from the wire assembly 26.

009Ö31 / 1S51.

As a result, by means of the impinging laser beam 30, in the manner illustrated with FIG. 7b, a molten mass accumulation 21 'made of tungsten-iron alloy is formed. When this condition has occurred, an axial pull is exerted on the free end of the wire supply 28 in the direction of the arrow indicated in FIG. 7c, as a result of which the molten mass accumulation 21 'begins to divide into two spherical or pearl-shaped bodies. The axial pull is maintained until the molten mass of tungsten-iron alloy has been completely separated. The laser is then switched off, and as a result of the surface tension of the molten alloy remaining on the severed ends of the wire stock 28, the corresponding spherical mass accumulations of molten alloy from ™ contract to form the pearl-shaped thickenings 21 which correspond to the severed ends of the wire assembly 26 are integral and united, as shown in Fig. 7d. The molten spherical aggregates consisting of the alloy material rapidly solidify so that the thickenings 21 of the fused tungsten and iron at the free end of the wire stock 28 as well as at the adjacent end of the newly formed, just severed section 29 are obtained. The section 29 closed off by the pearl-shaped thickening 29 (as shown on the right in FIG. 7d) is thus identical to the section 29 of FIG. 6 and has a predetermined length L.

fe As shown in Fig. 8, the thickenings 21 are with the ends of the tungsten core wire 23 and the fine tungsten wire 24 wound around it are combined and fused in the finished helix 20. The thickenings 21 thus securely fix the tungsten wires and at the same time ensure a smooth, rounded shape Termination at each end of the finished coil, so that coils are automatically prevented from becoming entangled with one another.

After the section 29, which has been cut off and provided with the thickenings 21, has been diverted and introduced into a funnel, the wire stock 28 is advanced by a distance L in relation to the laser and the process just described is repeated.

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get. If the laser beam intensity and the time the laser is turned on are properly _{matched to the speed at which x} the wire stock 28 is advanced and the use and strength of the axial pull acting on the end of the wire stock, can the work cycles are repeated at high speed to mass-produce sections 29 of wire stock 28 which are very uniform in length and terminated at their ends by pearl-shaped bulges. The preferred embodiment of a device that. meets these requirements is described below. .

It should be noted that the laser beam 30 the wire stock j 28 strictly speaking does not cut through in the actual sense, but- ' which can only narrow the iron mandrel 27 and thereby one Can arise mass accumulation of boiling iron, which then dissolves the overlying areas of the wire assembly 26, so that a spherical mass of molten tungsten wire bond forms. The actual separation of the wire supply 28 is thus caused by the axial pull that occurs after the formation of the molten Mass accumulation is exerted on the free end of the wire supply. This is an important aspect of the invention because the temperature of the iron mandrel 27 is close to that of the molten one Tungsten-iron alloy mass accumulation too low is to cause a recrystallization of the tungsten in the time that is necessary to carry out the melting and separating process- (| If this were not the case, the unmelted parts would of the Wclframdramdrames 23, 24 recrystallized and become brittle with the result that the end turns provided with the thickenings would break and separate from the completed helix 20, unless it is handled with particular care.

Preliminary test values show that the temperature of the iron mandrel 27 in the vicinity of the molten mass accumulation 21 ′ made of tungsten-iron alloy is approximately 1400.degree. C., while the recrystallization temperature of tungsten is approximately 1900.degree. Iron has a melting point of approximately 1535 ° C. Thus, both the

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Thickenings 21 as well as the tungsten wires with the turns 22 of the completed helix 20 can be deformed and in unrecrystallized State.

Another essential aspect of the present invention can be seen in this connection in the fact that the molten mass accumulation 21 'of tungsten-iron alloy increases in size as it is formed according to FIG. 7b, so that it is no longer in focused association with the laser beam 30 is located. Thus, a heating of the bulb-shaped molten mass accumulation is automatically stopped and an over-heating of the alloy as well as a possible vaporization and crystallization m capitalization prevented by the laser beam. Also, because the wire assembly 26 is basket-like in construction, it seeks to hold the molten alloy so that, as the separation occurs, approximately even amounts of the alloy are held by the severed ends of the wire supply.

As a result of the intense generated by the incident laser beam 30 Heat almost instantly melts and divides the molten alloy mass accumulation 21 *. The occurring Surface tension forces and the speed at which As the melting and separation occur, therefore, prevent the molten metal from falling off the wire stock 28. It it was also found that that required to melt the iron mandrel 27 and ™ to form the molten tungsten-iron aggregate 21 ' Time can be reduced considerably if the point of action by means of the laser beam on the wire 28 a fine jet of oxygen is directed. The resulting oxidizing atmosphere at the melting point calls for a controlled one Burns that occurred during the laser melting phase the amount of heat generated during the cycle increases. The preferred method of simultaneous thickening and separation includes accordingly the use of a controlled oxygen jet at the melting point.

An analysis of the fused tungsten-iron thickenings on the

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The ends of the non-running tungsten electrode coils, as described above, showed a composition of 75% by weight of Fe 1 - 20% by weight of W and about 5 % of Fe '' W for the thickened areas. On the basis of a 38% Fe-W phase diagram published by Hansen, it can be theoretically derived that only about 4.5% by weight of the tungsten was in solid solution with the iron and thus formed a real tungsten-iron alloy. The remaining amount of tungsten and iron did not form an alloy, but represented a metal mixture in the form of a two-phase Fe-W molding or body. The term "tungsten-iron alloy" used in the description and claims accordingly comprises a fused mixture of Fe and W, which may or may not contain a true solid solution or alloy of Fe-W.

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According to a special embodiment, the illustrated and above-described non-running electrode coil 20 has a total length of approximately 17 mm. The diameter of the iron mandrel 27 is approximately 0.4 mm, that of the iron filler wire 25 approximately 0.127 mm, that of the tungsten core wire 23 approximately 0.0584 mm (0.0023 inch), that of the wound tungsten wire 24 approximately 0.0254 mm (0.001 inch) , while the diameter of the completed helix has a value of about 0.76 mm. A 100 W COg laser was used, the beam of which was focused on a point on the iron mandrel of about 0.127 mm. The wavelength of the radiation generated by the laser was 10.6 microns. The energy density of the focused laser beam impinging on the iron mandrel is M

carried approximately 0.6 MW-cm. The laser was turned on for approximately 0.07 seconds while the free end of the wire stock 28 was subjected to a tensile force of about 142 g (5 oz) to remove the molten Separate mass accumulation from tungsten-iron alloy. The whole Thickening and separation were completed in the time in which the laser was switched on, d. H. within 0.07 see.

The removal of the iron mandrel 27 and the filler wire 25 from the section 29 of the wire stock equipped with thickenings was carried out by immersing the sections in concentrated chlorine

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Hydrogen acid for about 30 min. The iron components are removed Coils were then washed in deionized water and alcohol and then dried.

9a is a schematic representation of a preferred embodiment of a device and a circuit for separating wire stock or stock wire 28 in sections 29 of precisely defined length and for the simultaneous formation of tungsten-iron alloy thickenings reproduced at the two ends of each individual section in accordance with the present invention. The device comprises a table 32 with a pair of jaws 34 attached to a slide 35 extending along one of the table attached, provided with a guide groove guide 36 is movable back and forth. Only one of the two clamping jaws 34 is by means of a cam disk 37 is actuated via a roller interacting therewith and an interposed mechanical articulated connection. The cam disk 37 is advanced by a drive shaft 39 set in rotation by a motor (not shown) emotional.

The reciprocating movement of the carriage 35 is made by a V-shaped Causes rocker arm 40, which is pivotable about a fixed pin. One leg of the rocker arm 40 is with the Slide 35, the other leg, however, via a mechanical articulated connection and a roller 43 with a second cam disk 42 coupled. The cam disk 42 is contoured so that the rocker arm 40 is given a crankshaft-like movement, the the carriage 35 with one full revolution of the cam disk by one of the length of the sections 29 into which the supply wire 28 is divided is to be, advances the corresponding distance and then lets it return to its original position. Fig. 9a shows the positions of the various cam disks and the associated elements at the beginning of a work cycle, after a section 29 has been severed from one end of the supply wire 28 and ejected. 9b-9d show the cam discs and the settings of the associated parts as the drive shaft 39 continues to rotate through an angle of 270 ° in steps

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th of 90 °,

As shown in FIG. 9a, there is a third cam disk on the shaft 39 44 attached, which cooperates with a roller 45 which A switching arm 46 is actuated via a suitable articulated connection. The switching arm 46 lies depending on the setting of the cam disk 44 at one of two contacts 47, 48. At the beginning of Fig. 9a In the cycle illustrated, the switching arm 46 is at the contact 47 on, which has a conductor 49, a rectifier 50 and a Resistor 51 connected to one end of an AC voltage source is. The other end of the switch arm 46 is connected to the other end via a capacitor 66 and a second conductor 65 the alternating voltage source »In its starting position, ü the switch 46 thus connects the capacitor via the rectifier 50 and the resistor 51 directly to the voltage source, so that the capacitor 66 to one by the values of the rectifier and the resistor's predetermined voltage is charged.

A fourth cam disk 52, which cooperates with a roller 53, is also seated on the shaft 49. The roller 53 is mechanically connected via a suitable articulated connection to a further switching arm 54 which interacts with contacts 55, 56. The contact 55 is connected via a conductor 57 on one of the power input terminals of a CO ₂ laser 60 while the other contact 56 of the voltage source is connected via a conductor 58 to the conductor 49 and to that extent with Λ the other end. The other input terminal of the laser 60 is connected to the other side of the voltage source via a further conductor 59. At the beginning of the cycle illustrated in FIG. 9a, the cam 52 is oriented so that the switch 54 is in its "open" state as shown.

One seated on the drive shaft 39 and interacting with a roller 62 fifth cam plate 61 is by means of a suitable Articulated joint mechanically coupled to the movable jaw of a second pair of jaws 63 which are in alignment with the Clamping jaws 34 are attached to the table 32 at the level of the laser,

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On the table 32, on the side of the laser 60 facing away from the clamping jaws 63, an annular electromagnet 64 is fastened, which is electrically connected to the capacitor 66 and the contact 48 ^{via conductors 65 f and 67.}

Therefore, if the switching arm 46 subsequently engages the contact 48, the electromagnet 64 is connected in series with the capacitor 66, which is discharged via the electromagnet. This impulse energizes the electromagnet 64 and temporarily creates a magnetic field that affects the adjacent free end of the clamped Wire supply 28 attracts and exerts an axial force on this. In the case of the specific example described above, one The electromagnetic winding consisted of approximately 100 turns of copper wire with a diameter of a non-running electrode coil 20 of 1.6 mm, while the capacitor 66 had a value of 2000 / uF, the value of the resistor 51 was 1 ohm, the Rectifier 50 was formed by a commercially available diode for 20 A and 300 V and the voltage source was 110 V AC delivered.

In summary, the cam disk 42 is at the beginning of FIG. 9a reproduced cycle set so that the rocker arm 40 is ready to begin its forward movement and the carriage 35 together with the clamping jaws 34 to move a predetermined distance towards the laser 60. The cam disk 37 is so that the Clamping jaws 34 grasp the supply wire 28, and the cam disk 44 is adjusted so that the switching arm 46 is at the contact 47 attacks. The capacitor is in the charged state. The cam 52 is so that the switching arm 54 in its "open" Position is while the laser 60 is off. The cam 61 is so that the jaws 63 are open, and the electromagnet 64 is de-energized, since the switching arm 46 as a result of the influence of the cam disk 44 on the contact 47 and does not attack the contact 48.

To increase the heating effect of the laser beam on the wire stock 28, is injected through a nozzle 68 attached to the table 32

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fine oxygen beam directed at the focal point of the laser beam. The nozzle 68 is via a suitable line 69 with a Oxygen source in connection.

After rotating the drive shaft 39 and the various cam disks seated on it by an angle of 90 ° there are the clamping jaws etc. in the positions illustrated with FIG. 9b. As shown, the cam disk 42 has pivoted the rocker arm 40, which in turn rotates the slide 35 by a predetermined amount Has moved towards the laser 60. The clamping jaws 34 remain closed during this interval and thus move the clamped wire supply 28 by the same distance in the direction of the laser 60 so that the free J End of wire supply a predetermined distance above the fuel "~ point of the laser is moved out. The cam 61 has the Clamping jaws 63 held open so as to enable the wire supply 28 to be advanced. The cam disks 44 and 52 (not in Fig. 9b shown) hold the switching arms 46 and 54 in the positions shown with Fig. 9a, so that the capacitor 66 continues to be charged and the laser 60 and the excitation winding of the electromagnet 64 remain without power supply.

After rotation of the drive shaft 39 and the corresponding cam disks By an angle of a further 90 ° (a total of 180 °) according to FIG. 9c, the rocker arm 40 has remained immobile, so that the carriage 35 continues to move at the end of its forward travel (J. is located. However, the clamping jaws are through the cam disk 37 34 has been opened so that the wire supply 28 is released is and the carriage 35 and the jaws 34 the return can perform. The cam 44 holds the switch arm 46 in connection with the contact 47 so that the capacitor 66 continues charges and the electromagnet 64 remains de-energized. However, the cam disk 52 has actuated the holder 54 and closed so that the laser 60 is energized and its focused beam 30 the iron mandrel area of the wire stock 28 in one place acted upon by a predetermined distance from the previously with a thickened end is seen from the inside.

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After another 90 ° rotation of the drive shaft 39 (i.e. after Execution of a three-quarter turn) are the cam disks and the associated elements in those shown with Fig. 9d Positions. The cam disk 42 has then actuated the rocker arm 40 and thus the carriage 35 and the clamping jaws 34 in their starting position returned while the cam 37 is the jaws 34 has held in its open position. The cam 44 has actuated the switch 46, so that the capacitor Was able to discharge via the electromagnet 64 and the resulting magnetic field to the end section 29 of the wire supply 28 the point where it was melted by the action of the laser beam 30. In addition, the section was included conveyed through the annular electromagnet 64 therethrough. The laser remains through the action of the cam disk 52, which the Holding switch 54 in its closed position is turned on. The clamping jaws 63 remain closed by the cam disk 61 and thus fix the wire stock 28 during the cutting process. As illustrated, the wire has been severed from the wire supply Section 29 has tungsten-iron alloy thickenings 21 at both ends. The ring-shaped electromagnet 64 Any further conveyed sections fall into a collecting container or funnel (not shown). At the free end of the wire stock 28 there is also a fused tungsten-iron alloy thickening 21 formed. The provided wire supply is then ready to be used in connection with the next cutting process by one predetermined distance to be moved further.

Upon further rotation of the drive shaft 39 and the corresponding cam disks 37, 42, 44, 52 and 61 by 90 ·, so that a complete. Once rotation is carried out, the clamping jaws 34 are closed, the clamping jaws 63 are opened and the switch 46 is brought into engagement with the contact 47, so that the electromagnet 64 is switched off again and the charging of the capacitor 66 is initiated again. The switch arm 54 returns to its open position so that the laser 60 is turned off. At the end of a complete revolution of the drive shaft 39 thus are the various cams, jaws and switch back to using Fig.

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9a, the laser 60 and the electromagnet 64 turned off, the capacitor 66 begins to recharge, and the cycle just described is repeated.

The oxygen jet flows continuously from the nozzle 68, so that the melting, severing and thickening of the wire stock 28 take place in an oxidizing atmosphere.

From the above description it can be seen that the cam disks 37, 42, 44, 52 and 61 adjust the clamping jaws 34 and 63 as well as the carriage 35 in chronological coordination with the actuation of the switching arms 46 and 54, so that the laser 60 and the electromagnet 64 work repetitively rapidly in accordance with the movement of the wire feedstock 28 and the wire supply in Abschnit- Λ te 29 sever the comparable at both ends with thickenings 21st are see """""and have a predetermined, uniform length. In practice, a device with the specified features using a 100 W COu laser can operate at a speed of 400 feeds / min and thus a corresponding number of sections 29 of "embryonic" coils provided with thickened areas (corresponding to the special exemplary embodiment mentioned) in a minute if a fine stream of oxygen is directed at the melting zone, as the oxygen beam in the melting zone ■ controls combustion causes, the time required to melt the iron mandrel 27 is significantly reduced without the need to increase the power of the laser. Allows the machine to a faster feed \ working speed than the case that such a jet of oxygen is missing or that the melting is carried out in an indifferent atmosphere of nitrogen in air.

A practical embodiment of a manufacturing machine shown in operates in the manner just described is shown in FIG. This machine has the table 32 with a centrally located elongated platform 70 on which the clamping jaws 34 and 63 are attached. One attached to a corner of the table 32 Motor 71 drives shaft 39 provided with cam disks 37, 61, 44 and 52. In this embodiment, the cam

009 $ 31 / 155Τ

disk 42, the associated roller 43 and the one that interacts therewith Rocker arm 40 of the device shown in FIGS. 9a-9d by one on the slide on the one hand and one rotating on the other Disc 73 on the other hand, coupled link 72 replaced. The disk 73 is driven via a shaft 74, which its torque received from the drive shaft 39 via a bevel gear. The two shafts 39 and 74 are by means of the table fastened bearing blocks 76 held, in which the shafts can rotate freely by means of suitable bearings.

The handlebar 72 is coupled to the disk 73 at a point which is so far removed from the axis of rotation of the disk 73 that the carriage 35 is initially moved forward by a distance when the disk 73 is rotated through 360 ° along a groove 77 in the guide 36 which is equal to the length of the segments 29 to be separated, and then returns to its original position. This arrangement is thus functionally equivalent to the cam-rocker arm arrangement of FIGS. 9a-9d.

The cam disk 37 of FIG. 10 actuates the movable clamping jaw 34 via the roller 38 and a connecting rod coupled to the movable clamping jaw 34 at 79. The connecting rod 78 is movable by means of a bearing 80 Clamping jaws 34 can accordingly be moved back and forth along a predetermined path towards and away from the laser 60 and are opened and closed at the beginning and at the end of a stroke of the slide 35.

The second pair of clamping jaws 63 is by means of the cam disk Eq actuated, which engages via the roller 62 and a V-shaped rocker arm which is pivotally attached to the table 32 and via a Link 82 is coupled to the movable jaw G3. the The movable clamping jaw 63 is guided in a longitudinally displaceable manner by means of profile pieces 83 fastened to the platform 70. The electromagnet 64 controlling switching arm 46 is controlled by the cam 44 and the roller 45 interacting therewith. The den Switching arm 54 controlling laser 60 is actuated by the cam disk and the roller 53 interacting therewith.

009831 / 1SSt

The 100 W COg laser 60 is vertical above the table 32 through a support 84 held. The one with the clamping jaws 34 and 63 aligned annular electromagnet 64 rests on a bearing block 85. The wire stock is wound on a spool 86, the is attached to the underside of the table 32 by means of arms 87. The wire supply runs over a roller 88, which by means of a Arm 89 is held above the coil 86. The wire supply 28 then continues between the jaws 34 and 63 through as well through a nozzle-like wire guide 90. This wire guide 90 is also attached to platform 70 and oriented so that the wire stock intersects the laser beam 30, in the vicinity of the magnet 64 and also extends substantially coaxially thereto. - Ί. ■■■■ '■■■ -J

11 shows the phase diagram of the machine. · As can be seen therefrom, the various cam disks and drive devices (link 72 and disk 73) are so on top of one another matched that upon rotation of the shafts 39, 74 by 180 ° (forward stroke of the carriage 35) the clamping jaws 63. remain open and the Laser 60 and the electromagnet 64 are switched off. While the next 180 ° of a full revolution (i.e., during the return stroke of the carriage 35) the jaws 34 are opened, the The clamping jaws 63 are closed, the laser 60 is switched on and the electromagnet 64 is switched on for a short time immediately at the end of the cycle. The interaction of the clamping jaws 34 and 63 ■ * the wire supply 28 is thus periodically further through the wire ™ Guide 90 moved, and closed at their ends by thickenings Sections 29 predetermined length are separated from the free end of the wire supply 28 and by means of the magnetic Field conveyed by the ring-shaped electromagnet 64 into a collecting container 91.

With Fig. 12 is a slightly modified embodiment of the invention for cutting the coherent wire supply 28 into a plurality of sections of predetermined length L by means of a laser thickening process and a subsequent, separate one Cutting process shown. The wire supply 28 is in a

009831/1551

a predetermined way past a laser 60, which in temporal Coordination with the advance speed is switched on, so that the wire supply 28 at several, at equal intervals successive points melted and a series of fused tungsten-iron alloy thickenings 92 is formed. These thickenings 92 are then severed mechanically by means of a knife 93, so that individual sections are more predetermined Length L. In contrast to the sections described above, those are formed according to this embodiment Sections terminated at their ends by halved spherical thickenings 94 with essentially flat end faces. In the finished coil, these halved thickenings 94 extend transversely to the coil axis, with the end turns of the helix are integral and complete it.

13 is another embodiment of the invention reproduced for the production of fused metallic thickenings at the ends of a heat-resistant wire helix. At this The individual operations are carried out in the reverse order as in the example according to FIG. 12. As shown, the wire stock 28 is first cut into individual sections 29 'by means of a pair of knives 95. The knives 95 are at a distance from one another, so that the cut-out sections are initially cut by sections at their two ends Y are greater than the final length L. The sections Y are chosen so that they are tungsten-iron thickenings when melting the desired size. In the case of the non-running 40 W electrode coils described above, the protruding Sections Y each have a length of about 0.5 mm.

The sections 29 'precut from the wire stock 28 are aligned parallel to each other and then guided past a pair of GO lasers, for example by means of a suitable conveyor belt Distance is chosen and which are switched on so that their rays 30 the protruding portions Y of the corresponding Sections 29 * meet and melt when they come into their position in relation to the lasers. The resulting

009831/1551

Pending softened mass accumulations 21 ^{f of} molten alloy material automatically merge into spherical thickenings 21 of such a size that the final sections 29 have the desired length L. It is obvious that the sequence of operations explained above can be carried out automatically by using suitable actuating devices for the knives 95 in chronological relation to the advance movement of the conveyor belt and the activation of the lasers' 60.

One method of making thickened tungsten electrode coils that require heat treatment to straighten the coil on the mandrel is shown in Figures 14a-14d. According to this embodiment consist of the filling M wire 25 and the mandrel 27 of a different refractory metal such as molybdenum, which can withstand the heat treatment temperature. The heat-treated wire stock obtained is mechanically cut into sections of a predetermined length, and the heat-resistant mandrel and the filler wire are chemically dissolved in the usual way in order to obtain a tungsten helix 20 '(FIG. 14a) which is identical to known Y / ends and a Has tungsten core wire 23 and a fine tungsten wire 24 loosely wound around it. However, the length of the coil 20 'slightly exceeds the desired final length.

According to FIG. 14b, small rod-shaped sections 96 made of λ iron wire are inserted into the two ends of the helix 20 'so that their end faces lie essentially in one plane with the end turns of the helix. The ends of the helix 20 'are then aligned in relation to a pair of lasers 60 spaced from one another such that the focused laser beams 30 strike the inserted rod-shaped sections 96 at predetermined points located within the ends of the helix, such as is shown with Fig. 14c. The distance between the lasers 60 is such that the finished helix 20 of FIG. 14d with the subsequent integral thickenings 21 made of tungsten-iron alloy has the desired, predetermined length L. This process thus enables the production of coils with heat-resistant me-

0098 317 1551

tall thorns whose melting point is too high to be used without recrystallization to be able to melt the tungsten wire coil in thickenings.

Instead of the pre-cut rod-shaped portions 96 of iron wire into the ends of a spike-free tungsten wire coil 20 'according to use 14 Fig., A wire 97 made of iron (or other suitable metal) can be inserted axially into one end of the filament 20 ^f and at the same time by means of a laser beam 30 are melted to form a molten ball 21 "of iron which lies in the end turn of the coil and thereby loosens this end turn so that an integral thickening of molten tungsten-iron alloy is formed. After loosening the end turn of the coil 20 ' the laser 60 is switched off and the resulting thickening is cooled. The iron wire 97 is then cut off at the level of the outer end of the thickening by means of the laser 60 or a knife 1 are introduced between the turns in the helix 20 '.

The present invention can also be used to make an electrode or filament from tungsten wire, which has a fused metal thickening at both ends which forms an integral part of a wondel insert. This execution option is illustrated with FIG. 16. This will put sections 98 of iron wire or pins into the two ends a tungsten filament coil 99 'and then the ends of the tungsten filament and the iron wire. cuts melted so that the softened masses 21 'of molten tungsten-iron alloy (one of which is shown in Fig. 16a) arise. This implementation option largely corresponds to that of 14 with the exception that the sections 98 of iron wire are longer and only their outer ends by means of the laser beam 30 are melted. The finished filament 99 (FIG. 16b) is thus with a fused tungsten-iron thickening at both ends 21, which forms the end of the unmelted parts of the corresponding iron wire sections 98, and these

009831/1551

unmelted wire parts enclosed by the turns of the helix then serve as leadership assignments »

The finished filament 99 is attached to its corresponding power supply wires either by spot welding or by clamping the end parts of the winding with the iron wire sections 98 used Area within the scope of the present invention also have a plurality of secondary turns of larger diameter of a double helix thread, as used in incandescent lamps and high-performance electrodes for fluorescent lamps with high output power - ■ - '- -'

The new type of thickening, which serves as a finishing touch, is made of fused deformable metal according to the present invention can also be evaluated with advantage to determine the effective How to determine the "illuminated length" of a lightbulb filament is illustrated with FIG. 17. As shown in FIG. 17a, the thread 100 can be designed as a double helix and thus a middle barrel or barrel-shaped area with several spaced apart arranged from one another have secondary turns 101, at its ends in helical arms extending in the longitudinal direction 102 passes. The two helical arms are each back through one Thickening 21 made of fused tungsten-iron alloy completed. These two thickenings 21 are at a certain distance from one another and, as can be seen from the drawing, each have an outer diameter that is greater than the outer diameter the helical arms 102 is.

As shown in FIG. 17b, such a filament can be connected to power supply wires 103 of the holder be attached so that the lead wires 103 in the immediate vicinity of the inward pointing Boundary surfaces of the thickenings 21 are and preferably adjoin these. Because the thickenings 21 apart have a precisely defined distance, they are used for clamping

00 9831/1551

the helix by means of the lead wires 103 as guides or "reference points". This can reduce the length of the lead wires 103 suspended thread 100 can be determined in a very economical and reliable manner with great accuracy. The effective luminous length of the suspended thread 100 can thus be within very tight tolerances are adhered to.

As dargpLegt with the foregoing, the object of the invention to the problem of mutual entanglement of filaments, such as occurs in the manufacture and handling of running or barrel space free electrode filaments, remedy, solved in a practical and successful way been W. The coils, which have thickenings at their ends, can easily be produced en masse and reduce the reject rate considerably. By suitably modifying the method, coils provided with thickenings at their ends and with inserted guide sections can be produced.

It goes without saying that about the various exemplary embodiments shown of the method and the device according to the invention are also further modifications possible without therefore would go beyond the scope of the invention. For example, the invention does not apply to tungsten coils wound on wire-shaped iron mandrels limited. Rather, any combination can differ from ^ Different metals are made use of when they are melted work together in such a way that deformable (ductile) thickenings are created from a mixture of the fused metals, and which do not make the wire helix brittle. In this way, mandrels or inserts made of a metal (such as nickel, copper, aluminum, Cobalt or titanium), the melting point of which is of the order of iron, together with a tungsten or similar one Use heat-resistant wire coils.

The simultaneous thickening and severing of the wire stock 28 can be achieved by exerting an axial pull on the end of the wire stock instead of with the aid of the annular electromagnet described 64 take place by means of a mechanical device. One

009831/1551

such mechanical direction can have a wire grip, that by a suitable cam-controlled joint in time Assignment to the advance movement of the wire supply and the activation of the laser 60 is actuated to the end portion of the Wire supply in the same way as the electromagnet too pull and separate.

The invention can be used to prevent the interlocking of coiled objects which are made of thicker wire than for the filamentary E.lektrodenwendel 20, wherein the thickenings can be formed directly at the ends of the wire. The thickening may be fügig larger than the wire diameter in this case, only mild Jj, the essential ^v aspect is the fact that the ends of the wire are formed smooth so that they do not remain hanging on the turns of wire coils, thereby also do not allow entanglement to occur when the coils are filled into a container or otherwise processed en masse. If the coils have arm sections at both of their ends, these arm sections can have an uncoiled wire region which is terminated by a thickening, the size of which is equal to or slightly larger than the wire diameter. The term "thickening" in the present context thus comprises an amount of fused or melted material which forms an essentially smooth, non-adherent M surface at the two ends of an element such as a metal wire designed as a helix. The thickening does not need to be larger than to be the wire or material from which the helix is made.

Claims;

009831/1551

Claims (1)

Claims MLj helix with a plurality of spaced apart Windings, characterized by at least one thickening that is integral with the helix and thereby forming one end thereof molten material. 2, coil according to claim 1, characterized in that it is the Has the shape of an elongated spiral and that the thickening of molten material is integral with an end turn of the Wendel is and this completes. 3. Helix according to claim 2, in which the spiral is formed from wire W , characterized in that the thickening of molten material has a larger diameter than the wire and thereby closes the opening of the helix bounded by the end turn. 4. helix according to one or more of claims 1-3, characterized in that the helix is made of a heat-resistant material exists, which recrystallizes when heated to the annealing temperature and this temperature is maintained for a specified time and becomes brittle, and that at least that part of the helix which is adjacent to and integral with the thickening is to become essentially non-recrystallized Λ State is. 5, helix according to one or more of claims 1-4, which consists of heat-resistant metal wire and at their ends in passes over a plurality of turns of essentially uniform diameter, which are arranged at a distance from one another, characterized in that that both ends of the coil are closed by a thickening of molten metal and that the thickenings Bind formed by spherical bodies, which are separated from one another and essentially planar, extending transversely to the Have helical axis extending end surfaces. 009831/1551 - 31 - 6. V / endel according to claim 5, characterized in that the thickenings The ends of metal elements are, which extend over a predetermined distance into the corresponding ends of the helix extend in and form guide inserts for the helix. 7. helix according to claim 5 or 6, wherein the wire is made of tungsten consists, characterized in that the two ends of the helix are completed by a thickening of fused, deformable (ductile) tungsten-iron alloy and at least the turns of the helix which are adjacent to the thickenings and are therefore integral to one another essentially not are in a recrystallized state and are deformable. 3. helix according to claim 7, characterized in that the fused Tungsten-iron alloy thickenings have a diameter that is larger than the outer diameter of the adjacent ones Turns of the helix, and have a predetermined distance from each other. 9. coil according to claim 7 or 8, for use as an electrode in a fluorescent lamp o. The like., Characterized in, that the turns of the tungsten wire winding are loosely wound with fine tungsten wire and the ends of the fine tungsten wire run out into the melted thickenings and through these are anchored. J | 10. Helix according to claim 7, 8 or 9, which is for use as a filament For an incandescent lamp or the like. Is provided and the middle one Area several double-coiled ones arranged at a distance from one another has secondary turns, the spaced turns at both ends of the helix essentially form spiral arms that run straight in the longitudinal direction, characterized in that the molten tungsten wire alloy thickenings have a diameter greater than the outer diameter of the helical arms, and each other have a predetermined distance. 009831/1551 11. helix according to claim 7, 8, 9 or 10, characterized in that the helix has a linear structure and consists of a plurality consists of spaced turns which have a substantially uniform diameter, and that the tungsten wire is in a non-recrystallized state. 12. helix according to claim 11, characterized in that the winding Iron wire paired with the spaced-apart turns made of non-recrystallized tungsten wire runs and together with it forms a coiled, double-core core structure, around which fine tungsten wire is wound which, together with the core structure, forms a wire arrangement through which an iron mandrel extends, the ends of which are from the thickenings are formed from molten tungsten-iron alloy, which simultaneously each in the ends of the wire assembly skip and set this. 13. A method for producing a helix according to one or more of claims 1-12, characterized in that a certain amount of material in the immediate vicinity of a predetermined area of a coiled wire element is brought, the material is heated until it melts and with the fuses adjacent area of the coiled wire to form a thickening of molten material, which lies at one end of a segment and is integral therewith, and that the molten material subsequently to is cooled to solidify it. 14. The method according to claim 13, characterized in that the element of wound wire has the shape of an elongated Has wire spiral and the amount of solid material is used in the form of an elongated member in the spiral. 15. The method according to claim 13 or 14, characterized in that the solid material has a lower melting temperature than that has coiled wire. 009831/1551 ■ · · ■■■ ■■ 2002Q87 16. The method according to claim 15, characterized in that the amount of solid material is immediately adjacent to at least one end of the coiled wire element extends therein. 17. The method according to claim 14 or 16, characterized in that that the elongate member extends a predetermined distance extends in the spiral and only the end of the limb, which is in the immediate vicinity of the wire element, is melted to form the thickening and that the unmelted, inwardly located portion of the limb forms a guide insert for the helix. 18. The method of claim 13 or 14, wherein the coiled wire element of a spiral around a. Thorn that the (J Containing solid material, wound wire is formed, characterized in that the mandrel and the adjacent spiral are attached predetermined points along the elements are brought to melt, so that a thickening of molten at these points Material is formed, and that the element at the thickening points is severed into sections of predetermined length, so that a portion of the molten material on the severed The end of the wire spiral remains and a thickening there forms. 19. The method according to claim 18, characterized in that the thickened portions are located in the disruption in sections still in a molten state Λ and the thickened portions of these sections are generated simultaneously. 20. The method according to claim 18, characterized in that for Separation first waited for the solidification of the thickenings from molten material and the thickenings then mechanically get cut. 21. The method according to any one of claims 13-16 or 18 -> 20, in which the molten material is alloyed with the wire material enters, characterized in that the material is heated to a temperature at which it is with "the, wire a © 00 9831/1551 Alloy enters, so that a thickening of alloyed material is obtained, that then the thickening up to their Solidification cooled and finally the non-alloyed portion of the solid material is chemically removed. 22. The method according to one or more of claims 13-21, characterized characterized in that a focused laser beam is used to heat the solid material. 23. The method according to one or more of claims 13-22, characterized characterized in that the wire is made of tungsten 24. The method according to one or more of claims 13-23, characterized characterized in that the material is iron. 25. The method according to claim 23, characterized in that the remaining non-alloyed iron by immersing the with Thickened section is removed in hydrochloric acid. 26. Device for producing a helix according to one or more of claims 1-12 and for performing a method according to one or more of claims 13-25, characterized by a device for holding constructed from a mandrel with a winding of refractory wire Wire supply in relation to a laser, so that the areas of the Prahtvorrats to be cut transversely in sequence brought in front of and in the path of the laser beam when the laser is turned on; a device for focusing of the laser beam onto the mandrel component which is successively brought into the laser beam by means of the holding / advancing device Parts of wire stock; a device for switching on the laser for a predetermined duration in time Adjustment to the mode of operation of the Ilalte Z advancement device, so that the incident laser beam brings the mandrel component of the arranged part of the wire supply to melt and the 009831/1551 resulting molten mass accumulation of metal the overlying turns of the wound heat-resistant Metal wire loosens, so that a molten thickening is formed from a mixture of these metals as long as the Wire supply is held stationary relative to the laser; as well as by a device for exercising an axial Train on the free end of the wire supply in timing on the mode of operation of the holding Z advancing device and the device / for switching on the laser in such a way that the train immediately after the formation of the molten, thickening occurs from the metal mixture and divides the molten thickening so that the end portion of the wire stock is separated from the rest Wire supply is separated before the wire supply is moved on by means of the holding ZVorruekeinrichtung. 27. The device according to claim 26, characterized in that the holding ZVorrückeinrichtung the wire supply along a predetermined Orbit advances substantially normal to that of the laser generated beam runs, and that next to this path a device is provided to a transverse Oxygen radiates at those lying in the area of the laser beam To straighten part of the wire supply. 28. Apparatus according to claim 26 or 27, characterized in that the device for exercising the axial train in one Timing of the operation of the holding / advancing device and the device for switching on the laser has periodically excited electromagnets. 29. The device according to claim 26 or 27, characterized in that that the device for exercising the axial pull is a pair more reciprocable to and from the laser Has clamping jaws, with the help of which the free end of the wire supply can be detected after advancement by the holding / advancing device when the clamping jaws are actuated accordingly is. -. 0 0 983171551 30. The device according to claim 29, characterized by a device for moving back and forth and actuating the clamping jaws used to grasp the wire in the required position temporal assignment to the mode of operation of the other components of the device. 31. The device according to one or more of claims 26-30, characterized in that the holding / advancing device has two Has groups clamping jaws which can be actuated by means of cams rotated by a common drive shaft. 32. Device according to one or more of claims 26 - 31, characterized in that the control of the mode of operation of the laser is carried out by means of an electrical circuit that contains a switch that is operated by means of one of a common Drive shaft rotated cam is actuated. 33. Device according to one or more of claims 26-30, characterized in that the laser is formed by a COp laser is. KN / sch 3 009831/1551