US1701656A - Method of mounting dies - Google Patents

Description

, Feb. l2, 1929.

H. P. ARKEMA ET AL METHOD 0F MOUNTING DIES Filed July 19. 1926 Patented Feb. 12, 1929.

UNITED STATES .1,701,656 PATENT OFFICE.-

HAROLD PETER ARKEMA AND' SIGURD THRONSEN, 0F CHICAGO, ILLINOIS, ASSIGNORS TO WESTERN ELECTRIC COMPANY,1NCORPORATED, OF NEW YORK, N. Y.,`A COR- PORATION F NEW YORK.

METHOD or MOUNTING mns.

Application led July ,19, 1926. Serial No. 123,274.

This invention relates to methods pf mounting dies, and more particularly to methods of mounting diamond wire drawin dies.

In the art of wire drawing it as been the practice in some instances to mount a wlre drawing member such as a diamond die by casting suitable supportin material` around the die and thereby ren ering it readily ada table'for attachment to a' wire drawing mac ine. Experience in this particular art has shown that care must be exercised in casting molten material about a diamond die in order to prevent the crackingof the die due to the heat from the molten material.

Voids or interstices are sometimes present upon the surfaces of the dies, which are to be mounted, andin the event thatsuchvoids are present, itis very desirable that the material be cast around the die so as to completely fill any of such voids or interstices. If the material cast does not completely cover and make ycontact with the surface of the dies in the manner mentioned, the support or( mounting may not be of suiicient rigidity to effectively retain the die, in the proper fixed osition to withstand the stresses occasioned uring the drawing of the wire therethrough.

The object of this invention is to provide simple and effective methods of securely mounting a die in a holder therefor.

In accordance with the eneral features of the invention, one embo iment thereof is represented bg an apparatus whereby the improved met od for mounting dies may be practiced, which includes a heating element comprised of electrical current conducting material, such as carbon, in contact with the terminals of a pair of carbon conductors which are connected with a suitable source of 4o supply and are designed to carr current of high amperage. Means is provi ed whereby a diamond die may be properly positioned within a cavity or mold of the heating element and suitable mounting or supporting material such as particles of a nickel-iron alloy may be introduced within the cavity around the die. Current suppliedffrom the source will raise the temperature ofthe heating element sufficiently to fuse the material within the mold after which the current'is disconnected, the molten material encasing the die permitted to cool slowly completing the mounting of the die. j

These and other objects will be apparent from the. following detailed description when consldered 1n connection with the accompanying drawings, wherein Fi 1 is a plan view of an apparatus em? bodying features of the invention and whereby the Improved method of mounting may be effectively practiced;

lFig. 2 is a transverse vertical section of Y the apparatus takenv on the line 2-2 of Fig. 1;

3 is an enlarged fragmentary vertical seetlon' of the heating element as disclosed in Fig. 2, disclosing a diamond die .positioned Within the mold thereof, said mold being shown without a. charge of mounting material; l v

Fig. 4, is a horizontal fragmentary section taken on the line 4-4 of plan view of the heating e ement, and

Fig.'5 is a detailed sectional view taken on the line 5--5 of Fig. 1 disclosing a terminal clamping member.

Referring now to the accompanying drawings wherem like numerals have been employed to designate similar parts throughout the variousd1sclosures, it will be observed that the apparatus includes a rectangular base plate 10 comprised of suitable insulating material. Suitably mounted upon the upper surface of the base'plate 1,0 are a pair of'parallel support bars 11 which are channeled to receive companion carbon conductor blocks 12. These ,conductor blocks 12 are seated within thechanneled portions of the support bars 11 and are secured in position-by means of clamping means 14 comprising an inverted U-shaped member 15 and a pair of tighteningv screws- A16. The lower extremities of .the U-shaped members 15 areslidably mounted within ways 18vformed along the sides of the support bars l11.l By tightening the screws 16 against the surface of a' metallic plate 19 (Fig. 2) which rests upon the upper surface of each of the carbon blocks 12, the blocks may beepfectively secured against lbng'itudi-` nal displacement; These plates 19 are connected with the terminal of suitable con-l ductors 20 which are connected with any suitig. 3, disclosing a l L able source of electrical current `supply (not i yso 23. This heating element is provided with a cavity or mold 25 and the opposite sides of the heating element are designed to be engaged by and clamped between the opposed adjacent surfaces of the forward extremities of the carbon blocks 12 by clamping devices 26. Each clamping device 26 includes a screw member 28 threadedthrough a bracket 29 suitably mounted upon the base plate 10. The outer extremity of each screw 28'supports a hand wheel 30 and the inner extremity thereof supports a head 31 Slidably mounted thereon. Upon turning the hand wheel 30 after the heating element 23 has been positioned upon the carbon support block 22, the heads 31 engage with the .outer sides of the adjacent carbon blocks 12 and move said carbon blocks together sufficiently to positivelyengage with the sides of the heating element.

Subsequent to the clamping of the heating element 23 between the carbon blocks 12 a carbon pedestal 33 may be placed within thecavity 25 centrally thereof upon the upper surface of the carbon support block 22. A diamond or diamond die 34 (Fig. 3) having a central bore 35 may then be placed upon the positioned carbon pedestal 33. A bracket 37 secured to the base plate 10 provides a mountin for a vertical centering element 38 threa ed therein. By turning a hand wheel 39 at the upper end of the centering element 38 the lower pointed extremity thereof may be moved into the bore 35 of the positioned die 34, thereby rigidly securing the die within the central portion of the cavity 25.

Having thus been secured in osition within the cavity 25 the die 34 may e surrounded by finely divided particles of mounting material 41 (Fig. 2). It has been found by experimentation that a nickel-iron alloy comprising preferably not more than 7% nickel provides a very satisfactory mounting for diamond dies and this alloy in the form of particles may be readily placed within the cavity 25. Closing the electrical circuit containing the carbon blocks 12 and the. mold member 23 by any suitable switch (not shown) permits a current flow of high am perage through the heating element 23, thereby heating the element suiiiciently' to fuse the mounting material 41 within the cavity 25. Melting the nickel-iron mounting material about the die 34 in this manner causes any voids or interstices which may be present upon the surface of the die to be filled completely by the molten material. The current iow through the element23 need only be of very short duration and after the mounting material 41 has been completely fused and cast about the die 34 in the form of a vmantle it is allowed to cool slowly in order to insure against cracking and to prevent rapid oxidation of the carbon heating element 23. The centering velement'38 may now be disengaed from the die 34 and the clamping devices 26 may be actuated to release the heating element 23. The solidified mounting material 41 may be readily removed from theheating element 23 and the element may again be replaced in position upon the support block 22 and clamped in position to receive another unmounted die. It will be noted that the heating element 23 is formed (Fig. 4) with arcuate portions 42 whichpartially encircle the mold 25 and by this construction the heat generated by the current flow through these arcuate portions is effectively concentrated about the mounting material 41 placed within the mold 25. After the mounting material 41 has been allowed to cool and is removed from the heating element 23 the mounted die may be trimmed or machined and subsequentl attached in any suitable manner to a wire rawing machine. I

It is to be understood that by practicing this improved method of mounting dies, no pressure need be applied to the mounting material subsequent to its being fused, as has heretofore been the practice in some instances, for the purpose of preventing the formation of air holes or voids within the mounting material adjacent to the die. Fusing the material in position around the die 34 causes any gases which may be present to be positively driven oft' and when the mounting material solidifies, the covered portion of the die will be in direct contact with the material, thereby presenting a very rm mounting or mantle.

Althouglithe invention as herein illustrated and described is particularly well adapted for use in connection with the mounting of wire drawing dies, it should be understood that the novel features thereof are capable of other applications and should be limited only by the scope of the appended claims.

What is claimed is z 1. A method of mountin dies, which consists in positioning a die, lacing portions of mounting material adjacent the positioned drawing die, and fusing the portions into an integral mantle around the die.

2. A method of mounting dies, which consists in associating a die and portions of mounting material with an electrical current conducting medium, and applying an electrical current to heat the conducting medium 1 and fuse the portions of mounting material to form an integral mantle around the die.

3. A method of mounting dies, which consists in supporting a die within a cavity of an electrical current conducting medium, plac- -consists in positioning a 4. A method of mounting bored dies, which sists positioning a die within a'heat conconsists in positionin a die and contemve ing medium, placing iinel divided parporaneously closing bore ends thereof, tic es of mounting material a jacent the die,

lacing portions of mounting material adand heating the heat conveying medium to V `jacent the positioned die, and fusing the porfuse the positioned articles into an integral tions to form an integral mantle around the mantle around the ie. die with an opening at each end of the die 7. A method of mounting dies, which conbore. 4 sists in positioning a die, placing portions of 5. Amethod of mounting bored dies, which mounting material adjacent the positioned 1e withinv a cavity die, and simultaneously heating the die and of an electrical current conductor `and conthe portions o mounting material to fuse temporaneousl closing thebore ends, placthe ortions into an integral mantle around ing portions o mounting material within the the 'e. cavity, and applying an electrical current `Inwitness whereof, we hereunto subscribe to heat the conductor and fuse the portionsv our namesthisth day of Jul A. D. 1 926. toform an integral mantle around the die. HAROLDPETE 6. A method of mounting dies, which cont l SIGUED THBONSEN.

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