WO1998040184A1 - Device for receiving and discharging liquid working substances, especially soldering materials - Google Patents

Abstract

Known devices for producing component joints or surface coatings, comprise a heating device with a working part (1) which can heat a working substance until it reaches a plastic or fused state. In order to ensure that the working substance is discharged in a metered dose and that the working substance can be removed, for example in a desoldering process, the invention provides that said working part (1) has a working section (2) which is configured as a tool for applying working substances and consists at least partly of a porous material, especially metallic sintered material, sintered plastic or porous ceramic material. Said porous material then serves as a storage medium for removing and applying the working substance.

Description

DEVICE FOR RECEIVING AND DELIVERING LIQUID WORKING AGENTS, IN PARTICULAR SOLDERING MATERIALS

description

The invention relates to a device for producing connections of components and / or for coating surfaces, which has a heating device with a working part, by means of which a working medium required for producing the connection or the coating can be heated and brought into a plastic or molten state, wherein the working part has means for applying work equipment and means for removing work equipment.

A device of the generic type is known (DE-OS 1 752 081), which is designed as a soldering iron and is provided with a soldering tip which is used to produce soldered connections or coatings on components. This soldering tip is also intended for desoldering two components soldered to one another may be suitable and thereby forms the working part of the device designed as a soldering iron. In order to be able to use this soldering tip of the known soldering iron both for soldering components and for desoldering two components soldered to one another, the soldering tip is surrounded by a metal wire mesh that absorbs the solder. This metal wire mesh is approximately tubular and consists, for example, of a copper mesh, which should be similar to a shielding mesh of a coaxial cable, or of a mesh made of thin steel wire. For assembly, the metal wire mesh is pushed over the soldering tip and attached to the soldering tip by means of a clamping ring. This clamping bracket improves the thermal coupling between the metal wire mesh and the soldering tip, so that the metal wire mesh has the temperature of the soldering tip. With the help of this metal wire mesh, a simple desoldering of two components should be possible. If the metal wire mesh has become soaked with soldering material after desoldering several soldering points, the soldering material which is kept liquid in the metal wire mesh can be shaken off by a centrifugal movement, so that the metal wire mesh is able to absorb further soldering material again. The metal wire mesh must be used to solder two components on the soldering tip until the end of the soldering tip is freely accessible. This means that the known soldering tip can only be used to a limited extent for soldering and desoldering. In particular, either cooling, ie switching off the soldering iron to move the metal wire mesh, is necessary or special precautions must be taken to prevent injury to the operating personnel on the heated soldering tip. Furthermore, the metal wire mesh can not be used indefinitely, since the metal wire mesh often becomes brittle after a few days due to the permanent heat from the soldering tip and must be replaced by a new wire mesh. Also, after the solder material has been taken up during the desoldering process when the soldering iron has cooled, the metal wire mesh can only be moved with difficulty or not at all on the solder tip, since the solder material also connects to the solder tip at least in some areas. A safe displacement on the soldering tip is therefore only possible with a heated soldering tip.

The known device can also be used exclusively as a soldering iron for soldering and desoldering components and for surface coating components with solder material. Accordingly, the invention is based on the object of designing a device of the generic type in such a way that a corresponding working medium can be applied to a component by heating as a coating and a connection between two components should also be able to be established reliably. Furthermore, a metered delivery of the work equipment should be ensured and removal of the work equipment, such as during a desoldering process, should also be possible.

The object is achieved in that the working part has a working section which is designed as a tool for applying working medium and at least partially consists of a porous material, in particular metallic sintered material, sintered plastic or porous ceramic material, which acts as a storage medium for the removal and for the application of the work equipment.

The configuration according to the invention provides a device with which component connections or coatings on component surfaces can be produced in a very simple manner. By using a porous material, in particular a metallic sintered material, sintered plastic or a porous ceramic material, the working section of the working part of the invention direction a storage function, which is based on the capillary action and wettability of the porous materials given as examples. Depending on the working temperature, a wide variety of work equipment can thus be picked up and returned from the working section.

It is provided that the device according to the invention is used, for example, for the metered application and suction of adhesives, such as those used in connection with hot glue guns.

Depending on the selected working temperature and the design of the heating element, all soldering work can also be carried out, such as hard soldering and soft soldering. Due to the capillary action of the porous material of the working section, suctioning off from a solder joint, for example, is also possible by simply heating the solder joint over the working section to the working temperature and thus automatically removing the solder material from the pores of the correspondingly selected porous material for the working section the solder joint is suctioned off.

Depending on the work equipment used, an additional suction function may also be necessary, especially if the capillary action alone is not sufficient for suction. In these cases, the working section of the work can be coupled with a corresponding suction device, so that an additional suction effect is brought about on the working part and the working fluid is sucked through the working part.

To apply work equipment to surfaces of workpieces or generally to objects of any kind, the work part is first filled with the appropriate work equipment at the appropriate working temperature, so that when the work part contacts the corresponding surface, this work equipment is dispensed in a targeted and metered manner onto this surface. It is therefore also intended to apply graphic structures to these objects or workpieces.

Due to the interchangeable type of attachment of the working part to the heating device according to claim 2, working parts of different shapes can be coupled to the heating device for different tasks, so that different connections and surface coatings can be produced reliably.

An extremely good thermal coupling of the working part to the actual heating device is ensured by the mounting shaft provided according to claim 3, so that a relatively constant working temperature of the working part is ensured even when using a correspondingly temperature-controlled heating system. The configuration according to claim 4 ensures simple assembly of the working part on the heating device, with a reliable thermal coupling of the working part to the heating device being also ensured by a corresponding design of the mounting thread, the latching connection or the clamping connection.

The inventive design according to claim 5 ensures rapid heating of the working part or the working section, since the heating device is integrated in the working part and / or working section and emits the heating energy directly in the work station or its working section.

For heating the working section, a heating rod can be provided as a heating device, which is at least partially enveloped by the working section formed from porous material. This configuration according to the invention also gives off the thermal energy directly to the working section. It is also envisaged that the heating element, which can consist of a highly heat-conductive material that can be wetted with working fluid, forms part of the surface of the working section, so that, for example, during a desoldering process, the heat energy required to melt the solder material is directly passed on to the removing solder material can be dispensed is and thus significantly shorter heating times of the solder material can be achieved.

The supply and / or suction channels provided in accordance with claim 7 ensure a corresponding long-term use on the one hand for the production of connections and surface coatings and on the other hand for the suction of work equipment in continuous operation. The supply or suction channels can be connected to corresponding receiving chambers and supply chambers of the device, so that temporary work equipment can be supplied to the working part as required. Furthermore, by coupling the feed or suction channel with a corresponding suction system of the device, the absorption capacity for suctioning off excess working fluid is significantly increased, so that a constant suctioning of working fluid is guaranteed even in continuous operation.

The feed and / or suction channel can be arranged within the working section of the working part and can also end within the working part or working section. This reliably prevents that, for example, when applying work equipment, it cannot drip after the actual work process. If the working part is used, for example, as a soldering tip and pure solder is supplied to the soldering tip via the feed channel without flux, the feed channel, in particular for the metering of larger quantities of solder for a soldering point, also project completely through the work piece and, for example, have a dispensing opening at the outer end of the soldering tip. The same also applies if this channel is designed as a suction channel and larger quantities of solder material are to be extracted. Whether the supply and / or suction channel ends within the working part or extends completely through the working part depends essentially on the working medium used and its flow properties.

The configurations according to claims 8 and 9 also ensure a secure supply of work equipment for a large number of work processes. The cavity of the working part serves as an intermediate reservoir, which can be refilled via the feed channel according to claim 9 at any time from a corresponding receiving chamber.

Furthermore, the cavity can also serve as a receptacle for the suction of work equipment, whereby the work equipment can be reused for later manufacture of connections of components or surface coatings, for example, provided it is still free of contamination after the suction. This saves a lot of work equipment. Through the sleeve jacket of the working part provided according to claim 10, on the one hand a targeted supply of working material and a safe suction of the working medium is ensured.

By appropriate design of the sheath, it can form a type of supply and / or suction channel together with the working part or the working section according to claim 11, so that in particular a suction effect can be easily increased by applying a vacuum or a vacuum to the working part . A targeted supply of work equipment in larger quantities can also be carried out safely, the work equipment being supplied from a corresponding storage chamber to the work part e.g. can be fed from its back.

According to claim 12, the device according to the invention can be designed as a soldering iron, the working part of which forms a soldering tip made of porous material. With this device according to the invention, solder joints and surface coatings can be produced from solder material in the simplest way. Furthermore, solder material and flux can be easily extracted from a solder point for desoldering two components. By appropriate selection of the pore size of the porous material, there is also a metered supply of solder material to the solder point ensured that this solder material only reaches the solder point until a sufficient quantity is available. The pronounced capillary action of the pores of the porous material ensures that excess solder material can never reach the solder joint.

Due to the configuration according to claim 13, a conventional soldering iron can be easily retrofitted with the working part according to the invention. This can be of advantage in particular in the case of hand soldering devices with feed and / or suction channels already integrated in the solder tip, in particular if the solder tip itself cannot be replaced by a solder tip made of porous material. The working part pushed onto the already existing soldering tip reliably prevents unintentional dripping of the soldering tip, particularly when soldering components, so that the operational safety of an existing manual soldering device is considerably increased.

According to claim 14, the device can be designed as a hot glue gun, the working part of which forms an adhesive tip made of porous material. Similar to solder material, the hot glue used in hot glue guns has the property that they can be liquefied when heated to a certain working temperature, or at least in a plastic state. Thus, NEN hot glue points can be produced in a simple manner with the device according to the invention. Furthermore, owing to the capillary action and / or by additionally applying a vacuum or negative pressure to the working part, it is also possible to remove excess hot glue from an adhesive point.

By constructing the working section from layers of different porosity of the porous material according to claim 15, the receptivity of the working section can be improved for different or specific work equipment. For example, a lower porosity can be provided in the surface areas of the working section in order to ensure sufficient capillary action and a larger porosity can be provided in the inner areas of the working section in order to increase the absorption capacity. Different porous materials can also be used to achieve this different porosity the working section of the working part or also be provided for the entire working part.

According to claim 16, a partial area of the working section can be formed from a porous material which is provided for receiving work equipment, while another partial area of the working section is formed from a porous material which is not m able to hold work equipment, but is permeable to air. Using the example of a soldering tip, the further advantageous functional properties of a working section designed in this way can be explained. For example, a central core section of the soldering tip, which is freely accessible from the outside at its free end, can be formed from sintered bronze. This core section is intended for receiving and dispensing solder material. Furthermore, the core section is surrounded by a hollow body formed, for example, from ceramic porous material, from which the free end of the core section protrudes axially. This body can be surrounded by a shell, as has already been stated for claims 10 and 11. A solder tip designed in this way makes it possible, on the one hand, to suck off and also dispense solder material. On the other hand, due to its air permeability, the ring channel formed by the ceramic material or the body and its jacket and enveloping the core section can serve, for example, as a suction channel for the harmful vapors that often occur during the soldering process, by being coupled to a corresponding suction device. Since the ceramic material cannot be wetted with solder material, no solder material can inadvertently penetrate it, so that the ring channel always remains permeable for suction of the vapors. Surface modulation of the porous materials can be provided for the different purposes, in particular, for example, platinum coatings for ceramic material or metallic coatings for plastic materials can be provided if these porous materials are intended, for example, for the use of the working part as a soldering tip. This surface modulation of the porous materials increases the adhesion of the working medium, for example the solder material, to the pores of the porous material, so that the capillary action for receiving the working medium is also improved. Coating materials that can be used here are all materials that increase the wettability of the inner surface of the porous material of the working part for the respective application, so nickel, stainless steel, chromium, steel, tin, silver are exemplified for the use of the working part as a soldering tip.

Materials such as sintered bronze and comparable materials can be provided to produce a soldering tip. Such a solder tip made of porous sintered bronze is, for example, very well suited for use in soft soldering. To increase the service life of such a soldering tip, surface modulation can also be provided, so that oxidation processes are prevented or at least greatly reduced. Due to the design of the device according to the invention, a device is made available whose application area is extremely diverse. Thus, the device according to the invention, as already explained above, can be used as a hot glue gun for the metered application of hot glue and also for its suction. Depending on the choice of the working temperature, hard soldering and soft soldering are also possible, whereby a metered supply of solder material and also suction of the solder material, but also of harmful vapors during a soldering process, can be carried out in a simple manner.

Thus, with the device according to the invention, all work with work equipment can be carried out, in which the work equipment can be brought into a kind of molten state by reaching a certain working temperature. In this molten state, the working part made of porous material according to the invention makes it possible to safely carry out a metered supply of the working material to the desired work location.

The examples of use listed above are only examples, since other areas of use are also conceivable in which the working medium can be transferred to a molten state at a specific working temperature and is therefore compatible with the invention. ß device is processable. The areas of application of the device according to the invention are at most limited by the maximum achievable working temperatures.

As a further advantage, simple handling of the device according to the invention is ensured, since one-hand operation is reliably guaranteed. This means that the operating personnel always have one hand free to handle the components to be machined in order to be able to position these components in a functionally appropriate manner.

The invention is explained in more detail below with the aid of the drawings. It shows:

Figure 1 shows a working part according to the invention in cone shape with a connecting thread.

FIG. 2 shows the working part from FIG. 1 with an additional casing;

3 shows a working part according to the invention with an assembly shaft and a combined feed and suction channel;

4 shows a working part according to the invention with an additional mounting shaft and a cavity with a feed bore; 5 to 9 different geometrical embodiments of the working part according to the invention;

10 shows the working part from FIG. 4 in connection with a heating device;

11 shows a further possibility of mounting the working part from FIG. 4 on a heating element;

12 shows a cap-like working element which is pushed onto an already existing soldering tip;

13 shows a working part with an integrated heating device;

14 a working part consisting of different porous materials;

Fig. 15 is a partial section of a working part with an integrated heating element.

The exemplary embodiments listed below relate essentially to a working part which is designed as a soldering tip of a soldering iron or hand-held soldering device. The information on these exemplary embodiments can also be applied to the above-mentioned further application examples and should not be understood as a limitation of the subject matter of the invention. 1 shows a working part, which is designed as a soldering tip 1 and has an approximately conical working section 2. The working section 2 is rounded at its lower end 3. At its opposite upper end 4, the soldering tip 1 is provided with an assembly thread 5, via which the soldering tip 1 can be thermally and mechanically coupled to a corresponding heating device of a soldering iron.

The soldering tip 1 consists of a porous material, such as a metallic sintered material, sintered plastic or a porous ceramic material. Depending on the choice of the porous material, pore sizes with an average diameter d of approximately 20 μm to approximately 1300 μm or a porosity ε of approximately 26 ° to approximately 65% are provided for the solder application. Depending on the type of solder material to be used, this porosity may be larger or smaller in the outer areas of the solder tip than in the interior of the solder tip, in order to ensure an optimal capillary action and also an optimal absorption capacity of the solder tip for solder material but also for flux.

It is essential that the material from which the soldering tip 1 is formed represents em porous material. Due to the porosity of the material of the soldering tip 1, soldering material, flux and heat are on the soldering tip 1 can be fed remotely to a solder point. Smtebronze, stainless steel, brass, aluminum, titanium or iron may be mentioned here as examples of materials for the production of such a soldering tip. However, this additional payment is not to be seen as a restriction to these materials.

The soldering tip 1 itself forms a reservoir for solder material and / or flux and accordingly has a storage function. By using the porous materials mentioned, a capillary action of the solder tip 1 is brought about, whereby the absorption capacity of the solder tip 1 is achieved even for flux and / or solder material. To improve this absorption capacity, the porous material can be surface-modified, especially when using plastics or ceramics. Thus, when using plastics or ceramics, a metallic surface coating of the pores of these materials is provided, so that an improved adhesion, in particular of molten solder, is brought about to the pores of the material and thus the capillary action m of the solder tip 1 for receiving the solder material is improved. Nickel, stainless steel, chromium, steel, tin and silver are examples of the coating materials for surface modulation that he uses here as an example and not restrictive. When using sintered metals, such as sintered bronze, the surface life of the solder tip is also increased, for example, by such surface modulation, since oxidation processes, for example in the case of sintered bronze, are prevented or at least greatly reduced.

FIG. 2 shows a second exemplary embodiment of the soldering tip 1 from FIG. 1, which is provided with a jacket 6 over part of its total length. This sleeve jacket 6 prevents, in particular in the case of larger pore sizes of the porous material, uncontrolled leakage of solder material over almost the entire tip geometry, so that a precise application of solder material to the desired solder point is ensured without uncontrolled drop formation. The sheath jacket 6 can also be coupled to a suction device directly adjoining it (not shown in the drawing), so that the soldering tip forms a type of suction channel together with the sheath jacket 6. This suction channel can of course also serve as a feed channel for solder material and / or flux by providing an additional coupling with a corresponding feed system. A precise focusing on the active site of the corresponding component or components is achieved by the provided jacket 6. 3 shows a soldering tip 7 according to the invention, which has an approximately conical working section 8 which is fixedly mounted in an assembly section 9. The mounting section 9 is used with a corresponding design of a heating device of a soldering iron for receiving the soldering tip 7 of this heating device. In addition to this mounting section 9, a mounting thread 10 is provided at the upper end of the mounting section 9, so that the soldering tip 7 can be thermally and mechanically coupled to differently designed heating devices.

A combined supply and suction channel 11 is provided within the working section 8. This feed and suction channel 11 ends within the working section 8, so that it has no opening to the outside. This reliably prevents that, for example, when solder material is supplied through the supply and suction channel 11, solder material can escape from this channel 11 in an uncontrolled manner, since it is closed at its lower end by the porous material. Depending on the solder material used, this feed and / or suction channel 11 can also have a discharge or suction opening in order, for example, to be able to dispense larger quantities of solder material in a metered manner. It goes without saying that a plurality of channels can also be arranged in the working part or the soldering tip 7, with, for example, an channel as a supply channel for solder material, one for the supply of flux and one can be provided as a suction channel for flux and / or soldering material.

Through this supply and suction channel 11, the area of use of the soldering tip 7 is considerably expanded, since additional soldering material can be fed to the working section 8 when required, and the number of soldering points to be produced is therefore not only limited by the absorption capacity of the working section 8 itself. Irrespective of the actual soldering process, the supply of soldering material takes place after the production of several soldering points only when the supply of soldering material which is stored in the soldering tip itself or in its working section 8 is almost exhausted.

Furthermore, it is also provided for the exemplary embodiment of the soldering tip 7 to provide a corresponding sheath, as shown in the exemplary embodiment according to FIG. 2, so that, in particular, targeted suction of the soldering material and flux can be carried out from a soldering point. The additional enveloping jacket deliberately limits the suction effect via the supply and suction channel to the lower end of the soldering tip 7, as a result of which malfunctions due to possible suction of ambient air via the conical jacket surface of the soldering tip 7 are reliably excluded. 4 shows an exemplary embodiment of a soldering tip 12 with a mounting section 13, a mounting thread 14 and the working section 15. The working section 15 also consists of a porous material, a cavity 16 being provided within the working section 15, which serves as a reservoir, for example for soldering material . This cavity 16 has in the region of its upper end a filling hole 17, through which the cavity 16 can be refilled if necessary. Furthermore, provision is also made to couple this cavity 16 to the feed and suction channel 11 from FIG. 3. In this case, however, the fill hole 17 is not provided.

5 to 9 different geometrical designs of a working part according to the invention, in particular a soldering tip, are shown. 5 shows an exemplary embodiment in which the soldering tip 18 has a chisel-shaped working section 19.

6, however, shows a soldering tip 20, the working section 21 of which is designed as an elliptical end face.

The soldering tip 22 shown in FIG. 7 has a screwdriver-shaped working section 23 with which, for example, large-area soldering can be carried out. Solder tips 24 are also provided for fine soldering, as shown in FIG. 8, which have a tapering working section 25. Extremely fine solder points can be produced with solder tips 24 designed in this way.

FIG. 9 shows a solder tip 26 which has a diamond-shaped working section 27 which also tapers at one end. This soldering tip 26 with its diamond-shaped working section is suitable on the one hand for extremely fine soldering processes and also for the production of larger soldering points through the flat side parts of the working section 27.

10 shows the soldering tip 12, which, with its mounting thread 13, is screwed tightly and exchangeably with a nut thread 28 of a heating device 29. The heating device 29 is part of a soldering iron, not shown in the drawing. This threaded connection ensures a safe thermal transition between the soldering tip 12 and the heating device 29.

FIG. 11 shows a further embodiment of a heating device 29 'of a commercially available hand soldering device (the drawing not shown).

This heater 29 has a substantially transverse through bore 30, which m Soldering tip 12 with its mounting section 13 can be inserted appropriately. To fix the soldering tip 12 in the through-bore 30, a clamping screw 31 is provided, which is screwed into the end of the heating device 29 and coaxial with the heating device 29 and presses against the mounting section 13 of the soldering tip 12.

As can be seen from FIG. 11, for simplified handling of the soldering tip 12 in the heating device 29, the soldering tip 12 is arranged with its longitudinal central axis 32 slightly inclined to a plane running perpendicular to the longitudinal central axis 33 of the heating device 29.

12 shows a further exemplary embodiment of a working part 34 according to the invention, which is designed like a cap. In the present exemplary embodiment, the working part 34 is pushed onto an already existing soldering tip 35 of a hand-held soldering device 36 and is exchangeable. The hand soldering device 36 has a feed channel 37 for soldering material, which connects the soldering tip 35 to a storage chamber 38, which is used to hold the soldering material 39.

The storage chamber 38 is enclosed almost over its entire length by a heating device 40, so that the soldering material 39 can always be kept molten in operation in the storage chamber 38. Furthermore, in this exemplary embodiment of the hand soldering device 36 m of the soldering tip 35 e supply channel 41 is provided, which is connected via a corresponding connecting pipe 42 to an associated storage chamber (not shown in the drawing) for flux m connection.

To suck off excess solder material and / or flux from an existing solder point, the solder tip 35 has a suction channel, which is connected to a suction device (not shown in the drawing) via a corresponding connecting pipe 44.

With the hand soldering device 36 m connection with the porous working part 34 according to the invention, an extremely varied use of the hand soldering device 36 can be achieved.

A metered supply of solder material and flux to the solder connections to be produced can be carried out, with well over one hundred solder points being able to be properly produced in one work process due to the existing storage chambers.

The working part 34 according to the invention ensures safe metering of both solder material and flux, with the tracking of solder or flux not being continuous but at different time intervals, so that em Leakage of flux or soldering material is safely excluded.

Furthermore, this hand soldering device 36 in connection with the working part 34 according to the invention can be used in a very simple manner for suctioning off excess soldering material and also flux due to the suction device provided.

FIG. 13 shows an exemplary embodiment of a working part 45 with a working section 46 which is approximately conical and has a rounded conical tip 47. At its end opposite the conical tip 47, the working part 45 is provided with an approximately cylindrical mounting shaft 48, via which the working part 45 can be clamped and exchangeably mounted on a handle part (not shown in the drawing) equipped with corresponding mounting means. In the interior of the working part 45, a heating device 49 is provided in the form of, for example, heating wires or heating coils, which has a cylinder section 50 and a conical section 51 and is adapted to the shape of the working part 45 with its working section 46. The heating device 49 extends at least into the axial center of the working section 46, so that an extremely rapid heating of the working section 46 is ensured by the heating device 49. At the In the present exemplary embodiment, the heating device 49 is designed to be open at the bottom, so that the working section 46 can be supplied with working medium m in the quantities required by the supply opening 52 formed by the heating device 49. In the cavity 53 formed by the heating device 49, temperature sensors (not shown in the drawing) can also be provided, by means of which the temperature of the heating device 49 and thus the temperature of the working part 45 can be continuously measured and, accordingly, approximately constant at the desired temperature via a separate control device can be held. To supply energy to the heating device 49, the working part 45 has two contact pins 54 and 55 on the upper end face of its cylinder section 50, by means of which the heating device 49 can be supplied with the required electrical voltage by a corresponding external energy source or integrated in the handle part. The contact pins 54, 55 can be electrically coupled to corresponding contact elements of the handle part.

15 shows a soldering tip 68 according to the invention, which likewise has an approximately conical working section 69 which is fixedly mounted in an assembly section 70. The mounting section 70 is used to receive the soldering tip 68, as is the case if a heating device of a soldering iron is designed accordingly. 11 has already been carried out above. Within the working section 69 is a heating element 72, which is at least partially enveloped by the actual working section 69 made of porous material. At the lower end of the working section 69, the heating rod 72 protrudes somewhat from the working section 69 and thus forms a part 71 of the surface of the working section 69. In the present exemplary embodiment of FIG. 15, this heating rod is firmly connected to the mounting section 68 and thus also thermally with it coupled. Due to the direct heat coupling of the working section 69 via the mounting section 70 with a heating device, as is shown, for example, in FIG. 11, extremely good heat conduction of the heating energy to the working section 69 and thus extremely short heating times for heating the working section 69 are achieved. The surface section 71 of the heating element 72, which protrudes somewhat from the working section 69, furthermore enables direct heat transfer, for example during a desoldering process, to the solder material to be removed, so that its melting is facilitated.

14 shows a working part 56, which is formed from two different porous materials. The working part 56 thus has a working section 57, which can be formed from sintered bronze for receiving and dispensing solder material, for example. This work cut is approximately conical, its conical tip 58 being rounded. The working section 57 is embedded in a hollow body 59 and projects with its conical tip 58 axially downward from the hollow body 59. The hull body 59 is made of a material, for example ceramic, which is not able to accommodate working material in the form of solder material, but is permeable to air. In the present exemplary embodiment, the hollow body is surrounded by an airtight sleeve shell 60 and forms an air-permeable ring channel 67, which is open downwards to the cone tip 58 and is spatially delimited radially on the outside by the sleeve shell 60 and radially inwardly by the working section 57.

Above the working section 57 ends a suction channel 61 which mulls the body 59 and which is coupled to a corresponding suction device (not shown in the drawing). On the Hull body 59, an assembly thread 62 is provided, via which the Hull body 59 is fastened together with the working section 57 to a handle part 63. The suction channel 61 of the body 59 extends through the mounting thread 63 and is connected to a suction channel 64 of the handle part 63. For sealing the two suction channels 61 and 64, a corresponding sealing ring 65 is provided, which is arranged between the mounting thread 62 and the handle part 63. Em wide rer sealing ring 66 is provided between the casing 60 and the lower end face of the handle part, so that a suction flow acting through a corresponding suction device in the suction channels 61 and 64 continues to the lower end of the ring channel 67 through the porous material of the casing body 59. With this configuration of the working part, soldering material for soldering two components can be applied to the soldering point, for example, during a soldering process by the working part and, at the same time, vapors which are formed during soldering can be sucked off directly at the soldering point via the working part. This suction flow also simultaneously produces a cooling effect in the immediate vicinity of a solder joint to be produced, so that excessive heating of heat-sensitive components outside the solder joint can be reliably prevented.

It goes without saying that the exemplary embodiments listed above can be expanded as desired, depending on the field of application, and special application-specific shapes and configurations of the working part with its working section are conceivable. For fine soldering work, for example, for soldering and desoldering ICs or SMD components, extremely small soldering tips are necessary, which can be cranked, for example, for better access to the working area. The production of the working part takes place with the known sintering techniques, for example by hot pressing with possibly subsequent machining. The same applies to the material groups, such as ceramics and plastics, which are also given as examples.

In summary, the advantages of the working part according to the invention made of porous material should be mentioned again:

Soldering material, flux and heat can be supplied, stored and finely metered via the soldering tip according to the invention or the working part designed as a soldering tip.

A separate, manual or automatic supply of soldering material and flux can be omitted for a smaller number of soldering points or is only possible if there are a large number of soldering points to be manufactured through appropriate supply channels, the supply of soldering material or flux being decoupled from the actual soldering process.

This means that the supply of soldering material and flux only has to take place intermittently via corresponding supply channels, and nevertheless continuous, uniform soldering can be carried out safely.

Furthermore, the storage possibility through the porous material used forms over the working part or Solder tip a work supply of solder material and / or flux for several soldering operations, whereby tests have shown that with a somewhat larger design of the soldering tip, well over fifty soldering operations can be carried out.

It is also possible to safely remove excess solder material or also excess flux through the porous solder tip, but only in the case when the solder tip is not coated with these materials, i.e. Solder material or flux is saturated.

Furthermore, it is possible to work overhead without dripping solder material or flux.

The automatically metered delivery of solder material also ensures that solder material is saved. Only the amount of solder material that is necessary for wetting the heated component can reach the solder point.

Furthermore, the working part according to the invention, in particular in the case of soldering processes, can also be used as an aid for operating personnel with the least amount of soldering experience, since the supply and quantity of soldering material take place automatically and only the absolutely necessary amount of soldering material can emerge from the porous soldering tip, whereby an optimal dosage is automatically achieved. All porous materials are conceivable as materials for the working part or for the soldering tip, which form a capillary effect with the corresponding working means or with the soldering material, and thus can be taken up as working means in the corresponding working part or soldering tip.

As already mentioned above, various areas of application are provided for the working part according to the invention, e.g. for hot glue guns or for brazing. In these different application cases, it is only necessary to adjust the porosity and surface quality of the porous material used to the viscosity of the corresponding working medium in such a way that the capillary effect occurs reliably and thus a storage function of the working part with its working section is ensured.

It goes without saying that the different heating temperatures required for the working part must be applied for the various areas of application by appropriate design of the heating device to be used.

Claims

claims 1. Device for producing connections of components and / or for coating surfaces, the heating device (29, 29 ', 40, 49) with a working part (1, 7, 12, 18, 20, 22, 24, 26, 34, 45, 56, 69), by means of which a working medium required for producing the connection or the coating can be heated and brought into a plastic or molten state, the working part having means for applying working medium and means for removing working medium, thereby characterized in that the working part (1, 7, 12, 18, 20, 22, 24, 26, 34, 45, 56, 68) has a working section (2, 8, 15, 19, 21, 23, 25, 27, 46 , 57, 69), which is designed as a tool for applying work equipment is and at least partially consists of a porous material, in particular metallic sintered material, sintered plastic or porous ceramic material, which serves as a storage medium for the removal and application of the working medium. 2. Device according to claim 1, characterized in that the working part (1, 7, 12, 18, 20, 22, 24, 26, 34, 56) is replaceably attachable to the heating device (29, 29 '). 3. Apparatus according to claim 1 or 2, characterized in that the working part (7, 12) has a mounting shaft (9, 13), via which the working part (7, 12) on the heating device (29 ') can be fastened and with this thermally can be coupled. 4. Device according to one of claims 1 to 3, characterized in that the working part (1, 7, 12) or its mounting shaft (9, 13) via a mounting thread (5, 10, 14), a latching connection or a clamp connection replaceable the heating device (29) can be fastened and thermally coupled to it. 5. The device according to claim 1, characterized in that the heating device (49) in the working part (45) and / or in the working section (46) of the working part (45) is arranged integrated. 6. The device according to claim 5, characterized in that a heating rod (72) is provided as a heating device for heating the working section (69), and that the heating rod (72) is at least partially enveloped by the working section (69) formed from porous material. 7. Device according to one of claims 1 to 6, characterized in that the working part (7) has at least one feed and / or suction channel (11) for feeding and / or suction of the working medium, and that the feed and / or suction channel (11) ends within the working section (8) of the working part (7) or that the feed and / or suction channel completely projects through the working part (7) with its working section (8). 8. Device according to one of claims 1 to 7, characterized in that the working part (12, 45) at least in the region of its working section (15, 46) has a cavity (16, 53) for the working medium. 9. The device according to claim 8, characterized in that the cavity (16, 45) of the working part (12, 46) is connected to the feed and / or suction channel, or that for filling the cavity (16) with Arbeitsmit- tel an externally accessible filling hole (17) is provided, which opens into the cavity (16). 10. Device according to one of claims 1 to 9, characterized in that the working part (1, 56) is at least partially surrounded by an envelope (6, 60) which is impermeable to the working medium. 11. The device according to claim 10, characterized in that the envelope (6) together with the working part (1) forms a type of feed and / or suction channel, which is connected to a feed device and / or a suction device for feeding and suctioning work equipment. 12. The device according to one of claims 1 to 11, characterized in that the device is designed as a soldering iron, the working part of a soldering tip (1, 7, 12, 18, 20, 22, 24, 26, 56) made of porous material. 13. The device according to one of claims 1 to 12, characterized in that the working part (34) is cap-like and can be pushed onto an existing working element, in particular a soldering tip (35), and exchangeably pushed on. 14. Device according to one of claims 1 to 13, characterized in that the device as a hot Glue gun is formed, the working part forms an adhesive tip made of porous material. 15. The device according to one of claims 1 to 14, characterized in that the working section (57) of the working part (56) is constructed from layers of different porosity of the porous material and / or different porous materials. 16. Device according to one of claims 1 to 15, characterized in that at least a partial area of the working section (57) is formed from a porous material which is provided for receiving a working medium and that another partial area (67) of the working section (57) is formed from a porous material which is permeable to air and does not take up any working fluid. Applicant AZ. : F 085 / Int Applicant: Construction office Siegfried Feinler, Dreifaltigkeitsbergstrasse 4, 78549 Spaichingen (DE) Applicant number, Description: Device for taking up and dispensing liquid working materials, in particular soldering materials, for making and loosening connections, and for coating objects Summary Devices for producing connections of components or for surface coating are known which have a heating device with a working part (1), through which a working medium can be heated and brought into a plastic or molten state. In order to ensure a metered delivery of the working medium and also to enable removal of the working medium, for example during a desoldering process, the working part (1) has a working section (2) which is designed as a tool for applying working medium and consists at least partially of a porous material, in particular metallic sintered material, sintered plastic or porous ceramic material, which serves as a storage medium for the removal and application of the working medium. (Fig,