US2866364A - Wire drawing die blank and method of making same - Google Patents

Description

P. BIEBERICH Dec. 30, 1958 WIRE DRAWING DIE BLANK AND METHOD OF MAKING SAME Filed May 8, 1953 Fug. 1

PnuL BlEBERMH INVENTOR. B m/ m (QTTORNEY 2,866,364 Patented Dec. 30, 1958 WIRE DRAWING DIE BLANK AND METHOD OF MAKING SAME Paul Bieberich, Fort Wayne, Ind.

Application May 8, 1953, Serial No. 353,846

8 Claims. (Cl. 76-107) This invention relates to a wire drawing die blank and method of making same. More specifically, it relates to a die of the kind described in which the diamond is rigidly held in place in a central position in the holder and to a method which permits the manufacture of such a die without damage to the diamond.

Heretofore, one method of forming such a die consisted of forming a seat in each of two plugs, seating the diamond between the plugs and compressing the plugs toward each other in the holder. This method often resulted in shifting of the diamond and also splitting it.

Accordingly, it is an object of the invention to produce an improved die in which the diamond is firmly embedded in a central position.

A further object of the invention is to provide a die in which the material forming the receptacle is firmly fixed in the outer ring of the holder.

Another object of the invention is to provide a die in which intimate contact is obtained between the receptacle and the outer ring of the holder in order to secure good transfer of heat from the stone to the holder.

Yet another object of the invention is to provide a structure and method which will permit the use of aluminum as the material for the holder to obtain a better rate of heat transfer from the diamond.

Still another object is to provide a structure and method which will permit the folding and compression of the metal or" the receptacle into intimate contact with the entire exterior surface of the diamond and without exerting concentrated stresses upon the diamond.

These and other objects will become apparent from a study of this specification and the drawings which are attached hereto, made a part hereof and in which:

Figure l is an elevation, partly in section, showing the receptacle, ring and diamond in place under the punch ready to be assembled.

Figure 2 is a cross-sectional view of the die at the end of the pressing operation.

Figure 3 is a cross-sectional view of the completed die blank.

Figure 4 is a cross-sectional view of the completed die.

Referring first to Figure l, the numeral 1 represents the table or die block of the press, 3 the hold-down'element and 5 the punch which is movable relative to the hold-down element and has preferably a conical or other recess 7 formed in its end.

Numeral 9 represents the ring of the holder which is provided with a central, annular recess 11.

The receptacle for the diamond 12 is formed as a cylindrical slug 13 having a central counterbore 15 which bottoms in a conical or similar recess 17. The rim of the receptacle is preferably chamfered at 19 and the exterior diameter of the receptacle is preferably slightly smaller than the hole 21 in the ring.

If the ring and receptacle are made of metals such as Monel or bronze which require heating before pressing can be accomplished, this operation is performed and the parts are disposed on the table 1 in alignment with the punch.

The hold-down member 3 is then brought down on the ring. Since the hole 23 in the member and 21 in the ring are substantially the same size, the former will loosely receive the slug as shown in Figure 1.

Next, the punch 5 is brought down. The edges of the receptacle will be crowded inwardly by the conical recess 7 and bevelled edge 19 and thereafter downwardly, being folded and compressed all around the diamond.

' The receptacle will also be upset so that it will flow radially into close contact with the ring and will fill the groove or recess 11. This intimate contact is attained between the ring and receptacle and the material entering the recess 11 prevents relative axial movement of the receptacle and the ring.

At the end of the stroke of the punch, the ring and other parts occupy substantially the form shown in Figure 2. This blank is then machined at 25 to the shape shown in Figure 3, after which it is drilled and lapped into the finished form shown in Figure 4. 1

In the event a material such as a commercially pure, soft aluminum, such as a stress or impact aluminum, such as grade 28 is used, the compression step may be performed without heating the ring and receptacle.

' I have found that the aluminum forms a very good material for holding the diamond since it deforms readily and firmly and evenly contacts the entire surface of the diamond. Further, it is an extremely good conductor of heat so that reduces the deterioration of the diamond and permits high draw rates.

I have found that the diamonds mounted by my new method are seldom broken and that there is little shifting of the stone from its central position in the cavity 17.

While I have shown the recess 7 in the punch and the depression 17 to be conical, they may of course be spherical, parabolic or any other suitable configuration desired.

It is obvious that various changes may be made in the form, structure and arrangement of parts without departing from the spirit of the invention. Accordingly, applicant does not desire to be limited to the specific embodiment disclosed herein primarily for purposes of illustration; but instead, he desires protection falling fairly within the scope of the appended claims.

What I claim to be new and desire to protect by Letters Patent of the United States is:

1. The method of forming a diamond die blank comprising the steps of forming a ring having a through bore, forming a receptacle having a bottom and a cylindrical wall which is thin relative to its diameter, a depression formed in the interior surface of the bottom to receive a diamond, the end of the receptacle wall being externally chamfered, inserting a diamond in the depression and the receptacle in the bore, folding the wall inwardly and compressing it downwardly by means of a punch having an end recess adapted to fit over and around the chamfered wall, to force the metal of the receptacle into intimate contact with the bore and with substantially the entire surface of the diamond.

2. A diamond die blank comprising a ring of tough, strong material, having wall means initially defining a central hole, a receptacle of pure soft aluminum having a closed bottom and a cylindrical wall which is thin relative to the diameter of the receptacle, a diamond disposed within the receptacle such that said wall is folded inwardly at the top and downwardly into contact with the diamond, and said wall and bottom are axially compressed into intimate contact with substantially the entire surface of the diamond and expanded radially into intimate contact with said wall.

3. A diamond die blank comprising initially, a holder defining a cylindrical through hole, a receptacle disposed within and fitting slidably in said hole, said receptacle initially comprising a bottom and a cylindrical side wall said hole, into which recess, a portion of, said receptacleextends after compression.

5. Thestructure defined by claim 3 in which the interior of the bottom of said receptacle initially defines a.

central depression to receive and:center said diamond.

6. The structure defined by claim 3 in which the open end of said sidewall isexternally'chamfered, initially to promote the inward folding thereof under compression.

7. The method of forming a diamond die blank comprising the steps of forming a ring having athrough bore, forming a metal receptacle having a bottom and a cylindrical wall which isthin relative to its diameter, forming a depression in said bottom to receive a diamond, placing a diamond in said depression and the receptacle in said bore, folding the free end of said wall inwardly and corn-' pressing said receptacle axially to force the metal of the receptacle into intimate contact with substantially the entire surface of the diamond and to expand the receptacle radially into intimatecontact with said ring.

8. The methodof forminga, diamond dieblank com-.

prising the steps offorming a-ring having a through bore and, a recessin the bore,- forming a metal receptacle having a bottom and having a cylindrical wall which is thin relative to its diameter, forming a depression centrally in said bottom to receive and center the diamond, placing a diamond in the depression and the receptacle in the bore, folding the free end of said wall inwardly and compressing said wall and bottom axially to force the metal of the receptacle into intimate contact with substantially the entire surface of the.diamond, and with the surfaces of the bore and recess defined by said ring.

References Cited in the file of this patent UNITED STATES PATENTS 486,084" Clausnitzer Nov. 15, 1892 529,611 Dittmer Nov. 20, 1894 1,178,687 Strickland Apr. 11, 1916 1,420,224 Simons June 20, 1922 1,543,683 Simons June 30, 1925 1,910,198 Bradley et al. May 23, 1933 1,926,330 Cotton Sept. 12, 1933 2,171,323 Wyland- Aug. 29, 1939 2,212,394 Engle et'al. Aug. 20, 1940'v 2,236,288 Engle et al. Mar. 25, 1941 2,239,425 Jacobson Apr. 22, 1941 2,277,338 Luginbill etal; Mar. 24, 1942 2,328,794 Perrier Sept. 7, 1943 2,363,406 Ferrier- Nov. 21, 1944 2,422,612 Borne" June 17, 1947' FOREIGN" PATENTS 763,346 France. Apr, 27, 1934 771,687 France Oct. 13,1934

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