US2201225A

US2201225A - Die for making a t-shaped part

Info

Publication number: US2201225A
Application number: US177828A
Authority: US
Inventors: Jr Harry Cadwallader
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-12-02
Filing date: 1937-12-02
Publication date: 1940-05-21
Anticipated expiration: 1957-05-21

Description

May2l,1940.

H. CADWALLADER, JR

. DIE FOR MAKING A T-SHAPED PART Filed Dec. 2, 1937 Win n m5 I1 1 ML M H 6 a w ,1 W m a Patented May 21, 1940 UNITo STATES PATENT OFFICE DIE FOR. MAKING A T-SHAPED PART Harry Cadwallader, Jr., Philadelphia, Pa.

Application December 2, 1937, Serial No. 177,828

4 Claims.

. The present invention relates to drop forging dies and more particularly to the drop forging of T-shaped parts, such as nuts, bolt heads, and

the like.

5. In the manufacturing of T-shaped parts, it

has heretofore been the practice to either machine a piece of oblong or square steel bar stock to shape, or to prepare a die having a parting line at right angles to the flanges and machined to the required shape. Both of these prior methods require milling, planing, and cutting operations in the removal of excess metal, and to finish to shape, as well as centering for drilling, or hole sizing, and counter-sinking operations. All of this work is not only costly in itself but requires jigs and special fixtures for each operation.

Some of the objects of the present invention are to provide a new and novel die for forging 20 T-shaped parts; to provide a forging operation wherein machining operations are reduced; to provide a die for forging T-shaped parts whereby special jigs and fixtures are not required after the forging operation; to provide a die for forg- 25 ing T-shaped parts whereby surfaces heretofore necessitating finishing operations are obtained without such finishing operations; to provide a die for forging T-shaped parts wherein the parting line of the die is parallel to the top and bot- 30 tom faces of the flanges; and to provide other improvements as will hereinafter appear.

In the accompanying drawing, Fig. 1 represents a perspective of one part of a die embodying one form of the present invention; Fig. 2

35 represents a perspective of the other part ofthe die; Fig. 3 represents a section on line 3-3 of Fig. 1; Fig. 4 represents a section on line 4-4 of Fig. 2; Fig. 5 represents a perspective of the T-shaped part as formed by the coaction of the 40 die parts of Figs. 1 and 2; Fig. 6 represents a section on line 6-6 of Fig. 5; and Fig. 7 represents a sectional elevation of a modified form of die.

Referring to the drawing, one form of the present invention consist of a die formed by parts I and II, which are arranged to abut on faces I2 and I3 as the parting line of the die. The die part III is formed with the cavity I4, which is complemental in configuration tothe shape of one portion of the article to be forged, and, in this instance, is formed by two substantially rectangular walls I and I6 of different width but of the same length. The wall I5 joins the wall I6 along two opposite sides by two surfaces I'I, lying in the same horizontal plane, and having the function of forming the two upper finished faces I8 on the flanges 20 of the forged part 2|. That portion of the cavity I4 bounded by the walls It is shaped to form the substantially rectangular base block 22 of the finished part. 5 i

In order that the shank receiving hole 23 of the article can be partially formed during the forging operation, the bottom of the cavity I4 is provided, in the proper location, with a forming projection 24 of substantially conical shape, and of a length just sufiicient to displace the amount of metal necessary to create a depression without causing an excess of metal being forced into an adjoining area, where its presence is detrimental to the proper shaping and finishing of the fiat surfaces.

The die part I I, which coacts with the part ID to form a complete forging, is provided with a cavity 25 complemental in configuration to the shape of that portion of the article which is not shaped by the die I 0. This cavity 25, in the present instance, is formed by a substantially rectangular wall 26, and a bottom 21, the dimensions being such that when the two die parts I0 and II are in face to face operative position, the two cavities I4 and 25 register one with the other to form a complete metal shaping chamber.

In order that the shank receiving hole 23 may be partially formed in the bottom of the head portion of the forged part, a centrally disposed projection 28 is located in the cavity 21 in such a position that it takes a coaxial relation with the projection 24 when the two die parts are superposed. Thus the two

projections

24 and 28 function to center and form two holes respectively at the top and bottom of the forged part, whereby a minimum of drilling is required, and the usual centering operation eliminated.

Attention is directed to the fact that since the parting plane 3|] is in the head and lies parallel to the bottom of the head, as well as the surfaces I8, the bounding walls I5, I6 and 26 can be shaped with a minimum of angularity, thereby permittting the die to be drawn easily without roughened edges or irregular corners. In other 5 words the base block 22 as forged by the present invention is accurately dimensioned for correct coaction, with a machine slot of the T-type.

In Fig. 7 a modified form of the invention is shown wherein provision is made to form a counter-sink about the two holes formed by projections Hand 28. Thus the projection I4 in die part II] is encircled at its base by a bevelled surface 3|, and the projection 28 in die part I I is encircled at its base by a bevelled surface 32.

These surfaces 3| and 32 are properly dimensioned in order to respectively form similar depressions about the ends of the shank hole 23.

It will now be apparent that a. complete unitary die has been devised for making drop forgings of T-shape, and wherein the plane of parting is in the head and is parallel to the main flat surfaces of the article instead of at right angles thereto as has heretofore been the general practice. This shifting of the plane of parting results in new and unexpected results in that surfaces which had to be heretofore milled, planed and finished, are now finished in the forging operation. Also the centering operation for the shank .hole is dispensed with, as also the major part of the drilling.

While one form of the invention and a modification thereof are shown, it is to be understood that the invention is not limited to the exact construction as shown but may be varied according to requirements without departing from the spirit of the invention. For example the

projections

24 and 28 are preferably formed as integral with the die parts, but it isto be understood that these might be removable inserts and still be within the scope of the invention.

Having thus described my invention, I claim:

1. As a new article of manufacture, a two part die for forging a T-shaped nut blank, having its parting plane in the head of the T and'parallel to the top and bottom faces of the flanges forming the head.

2. As a new article of manufacture, a two part die for forging a T-shaped nut blank, having its parting plane in the head of the T and parallel to the top and bottom faces of the flanges forming the head and having a punching projection on one of its parts.

3. As a new article of manufacture, a two part die for forging a T-shaped nut blank, having its parting p1ane in, the head of the T'and parallel to the top and bottom faces of the flanges forming the head and having a punching projection on each of its parts.

4. As a new article of manufacture, a two part die for forging a T-shaped nut blank, having its parting plane in the head of the T and parallel to thetop and bottom faces of the flanges forming the head and having a punching projection on each of its parts, said projections being coaxially aligned.

HARRY CADWALLADER, JR.