US1684102A - Wire-drawing apparatus - Google Patents

Description

Sept. 11, 1928. 1,684,102

B. B. LEUSTIG ET AL WIRE DRAWING APPARATUS Filed Nov. 9, 1925 I gww toz' 6am my Patented Sept. $11 1928. v

, UNITED ATES BENNO B. LEUSTIG AND JOSEPH J). rnrscnn, or CLEVELAND,- OHIO.

- WIRE-DRAWING APPARATUS.

I Application filed November 9, 1925. Serial Ito. 67,774.

This invention relates to wire drawing apparatus and more particularly to wire drawing dies and holders therefor.

The general .objectof our invention is to provide a die and a holder therefor, ar-

.ranged in a novel manner whereby the die proper will embody a, minimum amount of steel in its construction and be of such shape that itmay beeconomically produced and I0 when in use function efiiciently. 'A more specific .object of our invention is the provision of a die holder construction which may be very rapidly taken apart to permit the insertion of adie therein and 15 whereby the accurate positionin of the die will become a mere incident to t e reassembling of the parts comprising the die holder. Further objects -of our invention will hereinafter become apparent from the following description referring to accompanying drawings, illustrating various forms thereof. The essential characteristics are summarized in'theclaims. I

In'the drawings, Fig. lis a perspective view of a wire drawing bench fixture adapted to support ournovel wire drawing die and holder and showipg two .forms of die holder mounted thereon; Fig.2 is a crosssectional view taken substantially along the line 2'2 of Figure1; Fig. 3 is a crosssectional view similar to Fig. 2.

It is the present day practice to form. wire drawing dies by drilling and reaming a plurality of holes in steel bars, the bars 85 beinghardened and tempered and the holes then formed to gauge. I These bars are positioned in suitable fixtures, or holders and as each opening becomes worn, the operator or'wire .drawer has recourse to an adjacent 40 opening in the bar. .When all of the openings-have been worn larger than the desired gauge, the bar is annealed and theopenings are reamed and burnished to a larger size and the bar again hardened and tempered.

46 However, it frequently occurs that such bars develop cracks, thus necessitating the discarding of the bar after a considerable If; thereofis considerably greater than its thickness, whereby it may be first produced mati'c furnace.

amount of skilled labor has been expended.

the drawing or gauginfgoaction upon the on an automatic screw machine and thereafter hardened and tempered in an auto- To make such a die shape practical we provide'a novel bench holder for supporting the die in a firm rigid manner to prevent the fracturing thereof when in use. In the event any one particular die becomes impaired during the hardening and tempering processes it can be discarded thus'involving the waste of only a minimum of steel and skilled labor.

-In Fig. 1 we show a bench fixture 12 of any convenient shapeto embody a vertically extending wall 13, comprising a metallic .slab of sufficient thickness to properly support 'a die and die holder, as will. be hereinafter set forth. Two forms of die holder adaptable to receive a button die of a simple economicalshape are shown in position on the fixture; In the form of holder shown in Figure 2 the wall 13 of the fixture 12 is suitably bored to have a coniform opening -.to receivev a bushing or sleeve 16, having a coniform surface 17 complementary to the coniform surface 18 'i of the fixture bore.

The sleeve 16 may be of suflicient length to extend through the wall 13 of the fixture with a small end 19 thereof suitably threaded to engage a lock nut 20 which serves to firmly wedge the sleeve 16 in fixed position in the bore of the fixture 13. The sleeve 16 .has a large end thereof suitably bored and threaded to receive a hollow die clamping nut 22 of a particular form and the intermediate portion of the bore thereof is formed with a slight taper to receive a button die 2 1. The button die has a coniform. surface 1 complementary to the tapered surface of the sleeve whereby it may be firmly wedged in the sleeve. T The die embodies just suflicient metal to withstand the wire drawing strains and is of a shape which is conducive to economical hardening and tempering and we find that these characteristics are prop- 1 0 erly represented when the button 'die 2i is of a diameter, which is substantially equal to twice the thickness thereof. 'This proportionmg of the die gives a considerable uniform section of, metal annularly about the gauging bore 25 thereof.- The button die may also have a counter-sunk lead or throat s 26 extending to thebore 25 to facilitate wire being drawn there m, or, as will be fqrmed in a separate member.

- clamping action of the nut 22. In other words the shape of theinner end of the clamping nut 22 is such that it may extend into the die receiving tapered bore of the sleeve 16, if a die of slightly smaller diameter should be used. The button die 25 as will be noted in Figures 2 andfl is formed to have'a fiat end surface 32 toafford an' accurate contact with the corresponding fiat surface 22, formed on the inner end of the clamping nut 22 whereby a uniform pressure may be exerted, upon the die.

An advantage to be found in the use of the sleeve 16 is due to the fact that a die holdingfixture, such asthe fixture 12, is subject to considerable wear and particularly the threads formed thereon for the dies have to be replaced a number of times in the course of one days use. The sleeve 16 can be readily replaced when the nut clamping threads thereof become worn without necessitating the discarding of the entire fixture.

It is to be understood that it is not our purpose to provide a die which may be compressed 'to such an extent as to cause a contraction of the gauge opening, when the latter becomes worn, but to accurately compress the die and prevent the formation of fractures therein when in use and to prevent strain or unequal stressing so that it will not subsequently crack in a rehardening operation. p

It will be apparent from the foregoing description of our invention that we embody in a Wire drawing apparatus, a wire drawing die of extremely simple form and which form is conducive to the obtaining of economy in the manufacture thereof, and furthermore, by providing a novel holder,-such die may be quickly attached to and removed from the wire drawing apparatus without necessitating an unusual expenditure of time there is a defect in the steel comprising the I and caution on the part of the operatorto obtain an accurate positioning and uniform clamping of the die member.

It will also be apparent that in the event of both labor and material when such idefective die is discarded. This characteristic is quite important when considering the present day practice. of discarding a multiple die when one of the bores thereof develops a fracture. Finally by confining the die bore to. a die of steel of; minimum dimensions, of definite relationship, it is possible to obtain a more uniform temper in a large number of dies.

Having thus described our invention, we claim: 7 i

1. In a device of the character described, the combination of a support, a holder mounted in the support in the form of a sleeve having a tapered exterior occupying a tapered opening-0f the support andhaving a threaded'portion projecting beyond the support, a nut screwed onto said threaded portion to clamp the holder in the support, said holder having a die cavity, a button .die in said cavity, the holder having an enlarged recess beyond the cavity internally threaded, and a nut screwed into such internal thread and bearing against the end of the button die.

2. In a device of the character described, the combination of a support, a holder mounted in the support in the form of a sleeve occupying an opening of the support and having a threaded portion projecting beyond the support, a nut screwed ontosaid threaded portion to clamp the holder in the support, said holder having a die cavity and adjoining the cavity an internally threaded recess, a button'die in said cavity, the periphery of the button die being conical and the cavity having a cooperating conical surface, there being a space within the cavity beyond the smaller end of the button die, and a hollow nut screwed into the internal thread of the recess and having an annular portion of less external diameter than the largest diameter of the die, said annular portion abutting the end of the die and forcing it into tight engagement with the holder.- y

In testimony whereof, we hereunto aifix our signatures.

, BENlNO B. LEUSTIG,

JOSEPH 1). PETSCHE.

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