US 2394720 A
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' e 1 DE HART SCRAN'ILIOM WIRE DRAWING DIE Filed Janf'l, 194s //vvENTo,2 D; G. S'CEHNTOM BY J I HTTOENE Y Patented Feb. 12', 1946 UNITED STATES PATENT-OFFICE WIRE nnawmc mu 1 De Hart G. Scrantom, Maplewood, N. J assignor to Western Electric Company, Incorporated, New York, N. Y.,' a corporation of New York Application January 7, 1943, Serial No, 471,578
7 Claims. (01. 76-107) This invention relates to a wire drawing die and a method of manufacturing it.
Objects of the invention are the provision of a simple and economically constructed wire drawing die and a method of expeditiously manufacturing such a die.
In accordance with one embodiment of the in- I vention, a diamond blank is inserted within opposing chamfered apertures in a pair of metal members which are heated to a soft state and caused to fiow around the blank by plungers engaging exterior surfaces of the metallic members.
A better understanding of the invention may be had by reference to the following detailed description when considered in conjunction with the accompanying drawing, wherein Fig. l is an explodedview in section of two me- ;tjllic members and a diamond blank to be assemed; J
Fig. 2 is a sectional view of the metallic members and blank, together with the assembling means I Fig. 3 is a view in section through a completed.
- Fig. 4 is a plan view of a completed die.
Referring to the drawing, wherein like reference characters designate the same parts throughout the several views, particular reference- I being had to Fig. 1, wherein a pair of metallic members 5 and 6 of identical construction are shown prior to their assemblywith a diamond blank 1. In the metallic members 5 and 6, there are provided central apertures 8 and 9, which are chamfered, as shown at l and H, respectively, and at l2 and 13, respectively. The chamfered surfaces at "I and II are adapted to receive the diamond blank 1' in the pockets formed thereby and after the metallicmembers and 6 have been heated suficiently to make them slightly plastic, they may be assembled with the blank I resting against the chamfered surfaces at Ill and H and pressure may be applied adjacent-the centers of the members 5 and 8 by opposed plungers l4 and i5. The pressure may be applied continuously until the semi-plastic metal has been displaced from the position shown in Fig. 1 to the position shown in Fig. 2, where the blank I is engaged throughout most of its surface by the metal of the members 5 and 8, whereby the blank will be held firmly in place with the metal members engaging all of'its surface except the portion directly in alignment with the central apertures in the members. When the plungers l4 and-l5 are pressed against the metal members 5 and 6, they will form pockets or depressions l6 and H, as
illustrated in Figs. 2 and 3, with the central apertures 8 and 9 still formed in the members 5 and '6 and exposinga portion of the diamond blank I, which may then be drilled to provide the forming surface l8 of the die, and the die will then be ready for use.
The metallic members 5 and B may be brazed together at the same time that the metal of the two metallic members 5 and 8 is pressed to set the metal around the diamond, or other suitable means for attaching the two metallic members together may be provided, such as the rivets l9. If the metallic members 5 and 6 are brazed together, it will not be necessary to provide the rivets l9 and, similarly, the members 5 and 6 need not be brazed if the rivets are provided.
What is claimed is: 1. A method of manufacturing a wire drawing die which comprises positioning a diamond blank within opposing depressions concentric with aligned apertures in similar metallic members, heating the members to render the body thereof plastic and applying pressure to opposed surfaces ,oi? the members concentrically with the apertures therein on an area of each of said opposed surfaces substantially less than the entire area of said surfaces and substantially greater than the area of the blank to press the body of the members into intimate contact with a substantial portion ofv the area of the diamond blank, attaching the metallic members one to another while holding the diamond blank between them, and thereafter drilling the blank.
2. The method of manufacturinga wire drawing die which comprises positioning a diamond blank in alignment with chamfered surfaces terminating in apertures in similar metallic memattaching the metallic members one to another,
and thereafter drilling the blank.
3. The method of manufacturing a wire draw ing die which comprises positioning a diamond blank in alignment with chamfered surfaces tera minating in apertures in similar metallic members, heating the metallic members before assembling them with the diamond blank, applying pressure to the metallic members in an area substantially larger than the projected area of the diamond blank and substantially smaller than the facial area of said metallic members whereby the metal of said metallic members is caused to fiow and fill the interstices around said diamond blank while the metal of said members spaced substantially from said diamond blank is not substantially distorted, attaching the metallic members one to another without displacing them from the position in which pressure has been applied to them, and drilling the blank.
4. A wire drawing die comprising a diamond blank, 9. pair of metallic members surrounding and engaging substantially all of the surfacetof the blank except two diametrically opposed areas of the blank and having undistorted areas .substantially greater than the area of the blank surrounding the blank-holding area, said undistorted areas being in abutting relation, and an aperture through the blank and metallic members forming drawing surfaces in the blank and guiding surfaces in the metallic members.
5. A wire drawing die comprising a pair of blocks of metal of the same shape brazed together and provided with central apertures in alignment one with another to form wire guiding surfaces, a diamond set between said metallicmembers 3 and intimately engaging the metallic members throughout substantially all of its surface except i the area in alignment with the apertures in the metallic members, a wire drawing surface formed by an aperture in the diamond coaxial with the apertures in the metallic members, and means for securing the metallic members together.
6. The method of manufacturing a wire drawforce the metal of said members in the area adjain; die which comprises positioning a diamond blank in alignment with chamfered surfaces terminating' in apertures in similar metallic members, heating the metallic inembersbefore assembling them with the diamond blank, applying pressure to the metallic members in a restricted area surrounding the apertures therein to force the metal of the members into intimate contact with the major part of the surface of the blank while leaving diametricall opposed surfaces of the blank free from contact with the metallic members, said restricted area to which pressure is applied comprising an area substantially less than the area of the abuttingsurfaces of the metallic members and substantially greater than the area of the blank, thus to leave relatively large surfaces of the metallic members undistorted, attaching the metallic members together, and forming a-die orifice in the blank which extends from one exposed surface to the other.
7. Themethod of manufacturin a wire drawing die which comprises forming a pair of metallic members to disc-like contour having a central bore terminating in chamfers at opposite ends,
heating said metallic members to render them slightly plastic, assembling the two members with the blank between them nesting in adjacent chamfers in the members, applying pressure to the outer opposite surfaces of said members in an area substantially less thanthe area of the said surfaces and concentric with the central bore to cent said bores into intimate engagement with the diamond, thereby forming depressions in said surfaces Without distorting the major portion of said members, attaching said members one to the other, and thereafter drilling the blank.
' DE HART G. SCRANTOM.