US2591298A - Equipment for use in the manufacture of drawing dies - Google Patents

Description

April 1, 1952 w. E. ROUX 2,591,298

EQUIPMENT FOR USE IN THE MANUFACTURE OF DRAWING DIES Filed June 1, 1950 L Ii i mmvrole.

A TTOQ/VE-Y llll l l l l l l f l l l l l Patented Apr. 1, i952 EQUIPMENT FOR USE IN THE IVIANUFAC- TURE OF DRAWING DIES William E. Roux, Oriskany, N. Y.

Application June 1, 1950, Serial No. 165,395

4 Claims.

v 1 My invention relates to equipment to be used in the manufacture of drawing dies, such as diamond dies, carbide dies, and dies of other ma-.

terials.

The wire drawing industry today demands dies the holes in which are truly round, the allowed tolerance in modern specifications being only .0092. To produce a die the hole in which is as nearly truly round or concentric as this is a difficult problem, which is well recognized by those engaged in this type of work.

During the manufacture of a wire drawing die it may be necessary to remove and replace the die from ten to thirty times, and, while present equipment works fairly well where the tolerances are large so far as concentricity of the hole is concerned, it does a poor and unsatisfactory job where under present-day exacting specifications the tolerance may be but .0902".

The apparatus constituting my invention is of such a nature that a hole of exact concentricity will be obtained regardless of the number of times it may be necessary to remove the die for examination, gaging, etc., or to reverse the work. My equipment is such that the exact center or axis will never be disturbed.

In the accompanying drawing, I have illustrated, in part sectional elevation, one embodiment of my invention.

Referring to the drawing in detail, 2 designates a die casing, which carries the element 3, in which the die is to be formed. As above pointed out, the element 3 may be diamond, carbide, or other material. The primary object of my invention is to enable a hole of exact concentricity to be provided in the element 3.

The die casing 2 'is set into a die receptacle 4,

the face of which is recessed for this purpose.

The recess in the die receptacle 4 is threaded, so as to receive a retaining nut 6, which, when screwed down, will retain the die casing in fixed and immovable position in the die receptacle 4.

The die receptacle is circular in cross-section and is accurately machined so as firmly to fit within and be concentric with the inner race 8 of precision-built ball bearing H].

To rotate the die receptacle 4 in the ball bearing 10, the ends of the receptacle are extended beyond the sides of the race 8 and. are equipped with driving pulleys I2 and I4. One of these pulleys, such as [2, may be integral with the die receptacle, while the other may be a press fit on the receptacle end, to facilitate assembling of the die receptacle with the ball bearing. It will be appreciated that means other than the pulleys i2 and 14 may be employed to drive the die receptacle and bearing race. For example, a gear train could be employed, if desired.

The entire assembly so far described is inserted into a holder 18, which has been recessed, as shown at 18, for the reception of the outer race 20 of the bearing. The assembly is held in place in the holder by a knurled bolt 22.

It will be appreciated from the above description that, in rotating the die element, it must rotate about the precise axis or center of the bearing l0. 1

It will be appreciated furthermore that the axis of rotation of the die element remains unchanged, regardless of the number of times it becomes necessary to remove the assembly from the holder Hi. It is quite obvious also that, when the assem-,- bly is removed from the holder, no particular care is necessary in replacing it, the recess in the holder being truly concentric with the outer race of the bearing, the latter, of course, being truly concentric with the inner race.

It will be appreciated that the assembly may be reversed in the holder without displacing the axis of rotation, which is at the precise center of the bearing.

It will be appreciated furthermore that the die casing 2 may be removed and then placed in position again as often as may be found necessary without disturbing the concentricity of the casing with the bearing, the recess in the die receptacle e being truly concentric with the bearing. No particular care need be exercised in placing the die casing within the die receptacle, and the die casing may be reversed when necessary or desirable without disturbing the concentricity of the die.

The mounting of the holder i6 is immaterial to this invention. I have shown a shaft-like extension 24 on the rear face of the holder, thisshaft extending through fixed member 2%. The outer end of the shaft may be threaded through another fixed member 28, so that, by turning the shaft with knurled flange 39 on the shaft, the holder may be moved lengthwise in fixed member 26. The shaft is held in adjusted position by' screw 32. This arrangement provides for proper setting of the work with respect to the tool 34.

The tool 34 can be a cutting or drilling tool or a lapping or grinding tool, and, so far as my in-- vention is concerned, it may be mounted in any conventional fashion. The only essential is that initially this tool shall be centered exactly, with any of the indicators or other well known instruments, with the exact center of the bearing 10.

It will be seen from all of the foregoing that my invention provides die making equipment which is so constructed and arranged as to enable the hole in a drawing die to be made truly round, so that the exacting requirements of present-day specifications can be met without difficulty.

It is to be understood that changes may be made in the details of construction and arrangement of parts hereinabove described and illustrated in the drawing within the purview of my invention.

What I claim is:

1. Apparatus for the drilling and piercing of dies, said apparatus comprising a rotatable assembly composed of a die casing, a die receptacle having a recess for the reception'of the die casing to mount the casing concentric with the die receptacle, and a bearing for the receptacle concentric with the die casing and receptacle; a holder in which the assembly is removably mounted; and a drill mounted externally of said assembly and holder and rotatable about an axis aligned with the axes of the die casing, receptacle, and bearing; the said assemblybeing invertible in said holder while maintaining the, axial alignment of the drill and assembly.

2. Apparatus for the drilling and piercing of dies, said aparatus comprising a rotatable assembly composed of a die casing, a die receptacle for mounting the casing concentric with the receptacle, and a concentric bearing for the receptable; a holder in which the assembly is mounted; and a drill mounted externally of said assembly and holder and rotatable about an axis aligned with the axes of the assembly and holder; said assembly being removably mounted in said holder to permit the assembly to be inverted while maintaining the axial alignment of the assembly and drill.

3. Apparatus| for the drilling and piercing of dies, said apparatus comprising a rotatable assembly composed of a die casing, a die receptacle for mounting the casing, and a bearing forthe receptacle, said elements being concentrically disposed relatively to each other; a holder in which the assembly is removably mounted; a drill mounted for rotation externally of said assembly and holder, said drill being axially aligned with the axes of the assembly and holder, said assembly being invertible in the holder while maintaining the said alignment of drill and assembly; means at one end of the die receptacle for applying power thereto to rotate the same when in initial position; and means at the oposite ,end of the die receptacle for applying power to the receptacle to rotate the same when in inverted position.

4. Apparatus for the drilling and piercing of dies, said apparatus comprising, in combination, a recessed, non-rotatable holder; a ball bearing removably mounted in the recess of said holder and comprising inner and outer concentric races, means for maintaining the outer race fixed with respect to said holder, a rotatable die receptacle fitting within said inner race and concentric therewith, said die receptacle being provided with a recess concentric with its periphery, a die casing mounted in said recess and 'concentric therewith, said die casing being ro- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 367,733 Wallace Aug. 2, 1887 1,428,209 Blount Sept. 5, 1922 1,885,178 Bsteh Nov. 1, 1932 2,530,424 Dickinson Nov. 21, 1950 FOREIGN PATENTS Number Country Date 548,533 Great Britain Oct. 16, 1942

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