US1231324A - Master-die for forging dies for drop-hammers, presses, and the like. - Google Patents

Description

A. F. ARTHUR.

MASTER DIE FOR FORGING DIES FOR DROP HAMMERS, PRESSES, AND THE LIKE.

APPLICATION FILED APR. 27, IBIS.

' 1,231,324., Patented June 917.

2 SHEETSS A. F. ARTHUR.

MASTER DIE FOR FORGING DIES FOR DROP HAMM RESSES- AND THE LIKE.

APPLICATION FILED APR.'27,

LQ31,32% Patented J une' 9W.

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ALBERT F. ARTHUR, OF CLEVELAND, OHIO. ASSIGNOR TO TI-IE CLEVELAND HARDWARE COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

MASTER-DIE FOR FORGING DIES FOB. DBOPI-IAMMERS, PRESSES, AND THE LIKE.

Specification of Letters Patent.

Patented June 26, 1.917.

Application filed April 27, 1916. Serial No. 93,835.

To all whom it may concern:

Be it known that I, ALBERT FQARTHU'R, a citizen of the United States, residing at Cleveland, in the county of Cu'yahoga and State of Ohio, have invented certain new and useful Improvements in Master-Dies for Forging Dies for Drop-Hammers, Presses, and the like, of which the following is a full, clear, and exact description.

This invention relates to certain improvements in the construction of master dies, adapted particularly for the purpose of making dies for drop hammers, hydraullc presses and the like.

Heretofore dies used in drop hammers and presses have been made by hand or by die sinking machines, but in either event the production of the dies requires an expenditure of considerable time and skilled labor.

It has been proposed heretofore'to forge the dies, but so far as I am aware forged dies have never been a success due chiefly to the fact that the pattern carried by the master die could not be accurately repro duced in or transferred to the block from which the die is forged.

By my invention I am able to produce accurate dies by a forging process, the pattern being very accurately transferred or impressed in the heated block or body of metal and having sharp, well formed lines and corners.

My invention consists in certain novel details of construction and arrangements of parts which will be described in the specification and set forth in the appended claims.

In the accompanying sheet of drawings wherein I have shown two forms of my invention, Figure 1 is a view partly in longitudinal section and partly in side elevation of two master dies constructed in accordance with my invention; Fig. 2 is a face view of the upper master die; Fig. 3 is a view partly in end elevation and partly in cross-section of the master dies of Fig. 1, the section being taken along the line 33 of Fig. 2; Fig. f is a view of a composite die including a finishing die produced by the forging process from the master dies of Figs. 1 to 3; Fig. 5 is a cross-sectional view of the composite die shown in Fig. 4, the section being taken along line 55 of Fig. 4; Fig. 6 is a view similar to Fig. 1, showing a modification; Fig. 7 is a view similar to Fig. 3, showing the dies of Fig. 6, the section being taken along the line 77 of Fig. 8; Fig. 8 is a face view of the upper master die of Fig. 6; Fig. 9 is an end view of a composite die including a finishing die forged with the master dies shown in Figs. 6, 7 and 8 5 Fig. 1.0 is a cross-sectional view showing a modification wherein the finishing and roughing-out dies are forged in the same body; Fig. 11 is a view similar to Fig. 8 showing a modification in the form of thretaining wall which surrounds the pattern.

Referring now to Figs. 1 to 5, for the production of the forged die, I employ two master dies consisting of an upper master die 10 and a lower master die 12. One of the master dies, in this case the upper die. is in the form of a hollow matrix provided with a rather deep recess or cavity 13 having inwardly tapered side walls 14 and having on the base the pattern which is generally in cameo, the pattern being shown at 15. The other master die, in this case the lower die, is provided with a rather shallow depression 16 whose contour corresponds to the contour of the large part of the cavity 13. Furthermore, one of the dies is provided at its corners with lugs 17 which are designed to fit into depressions formed in the corner portions of the other die, so that the cavities 13 and 16 will register when the heated metal is being forged. It will be observed that the cavity 13 in the upper master die is provided on one side with a lateral depression 18 (shown particularly in Fig. 2).

The two dies will be secured respectively to the hammer head or plunger and base or anvil of a forging machine such as a drop hammer or hydraulic press, and to produce the forged die a block of heated metal is placed on the lower die and is forged between the two master dies. This forges the metal so as to make it correspond in shape to the shape of the two cavities or recesses 13 and 16 of the two master dies, and in the end produces a die which is shown at 19 in Figs. 4 and 5. The die 19 here shown constitutes the finishing die of a composite die which includes in addition to the finishing die, roughing-out dies 20 formed in a. suitable holder or shoe 21. It will be observed that the die 19 is provided at one side with a shank or projection 22 which is formed in the laterally projecting recess 18 of the upper master die. This die 19 is provided also with tapering side walls, shown particularly in Fig. 5, and is held in position in the shoe by a key 22. lVith certain dies, 6. 6., with certain more or less simple shapes and designs of the pattern 15, the die proper or configuration of the pattern is accurately transferred or reproduced in the die being forged with master dies constructed as so far described. However, when the pattern is at all intricate, and particularly if it has rather deep projecting portions, sharp well definedlines and corners cannot be reproduced in the forged die unless other means are provided, the metal having a tendency to spring a ay from the pattern, leaving in fact an imperfect reproduction and imperfect forged die. I am able to overcome this objection entirely by the use of a retaining wall (shown in Figs. 1 to 3 at 28). This retaining wall is in the form of a rib or projection which extends or projects from the face of the die carrying the pattern 15 and is located adjacent the pattern 15 and between the latter and the side walls of the cavity. This retaining wall is preferably provided with tapering side walls and may wholly or partially surround the pattern. In Fig. 2 it is shown as U-shaped or only partially surrounding the pattern, for the reason that only a portion of the pattern here shown requires the assistance of the retaining wall to form sharp and well defined lines and corners. By means of this retaining wall the metal is held in or prevented from springing away from the pattern so that practically a perfect pattern is reproduced in the die being forged. A further advantage of this retaining wall is, it prevents the pattern being broken. I have found in practice that there is a tendency for certain portions of some patterns, particularly if they are intricate and rather deep, to be broken by the flowing or movement of the metal during the forging process. This retaining wall minimizes the flowing or the movement of themetal and protects the adjacent parts of the pattern from breakage.

This retaining wall produces in the die being forged a depression which conforms precisely to the shape and contour of the retaining wall. This depression is of no advantage in the die and before the die is used will be filled with suitable metal by an oxyacetylene torch or electric welding machine or equivalent apparatus. In Fig. 5 the recess formed by the retaining wall has been filled flush with the face of the die with metal, this being shown at 23.

With the composite die shown in Figs. 4 and 5 the roughing-out or break-clown dies may be out directly in the shoe, but this can be done with considerably less expense than the finishing die can be cut, for the reason that the roughing-out dies need not conform precisely to the shape of the article to be forged and need not, therefore, be accurately cut.

In Figs. 6, 7 and 8 I have shown master dies for producing a somewhat differently shaped die. In this case the two master dies comprise an upper hollow matrix 25 having a recess or depression 26 with tapered side walls and With the pattern 2'? in cameo at the base of the recess. The lower master die 27 is in thiscase also provided with a recess or depression 28, this recess 28 being considerably deeper than the recess in the lower master die of Fig. 3, and likewise being provided with tapered side walls. In this case the body of the die is formed in the upper master die or in the recess 26 while in the recess 28 of the lower master die is formed a shank or projection which is utilized in holding the die in the shoe or holder. By referring to Fig. 9 it will be seen that the die 29 which is produced in the master dies 25 and 27 is provided with a body 00 which is formed in the recess 26 of the upper master die and with a dovetail shank 31 which. is formed in the recess 28 of the lower master die. This shank is formed with undercut sides by planing off the sides of the shank as it is formed in the recess 28 of the lower master die, inasmuch as the taper of the side walls of this recess is just in the reverse direction to the taper of the sides of the shank 31. The 'die 29 of Fig. 9 is shown as held by a key 32 in a recess of a shoe or holder 33, the recess having a main portion to receive the body of the die and a narrow portion to receive the shank, the latter portion hav ing its sides tapered to accommodate the tapered shank 31 and key 32. At the sides of the finishing die 30 are the roughing-out dies 34 which can be out directly in the shoe or holder 33.

By referring to Fig. 8 it will be seen that a part of the pattern 27 is surrounded by the retaining wall 35 which is similar to that shown in Fig. 2 and is employed for precisely the same purpose as previously described.

In Fig. 10 I have shown a forged die 35 wherein the finishing and roughing-out dies as well as the finishing dies or patterns are forged in the block or body producing by the forging process a die which is the equivalent of the composite die shown in Figs. 4: and 9. In forging both the finishing and the roughing-out or break-down dies in the block or body, the base of the recess of the upper master die will have three patterns arranged side by side. It will be understood that when the roughing-out as well as the finishing dies or patterns are forged in the block or body somewhat larger dies will be required than as shown in the preceding figures wherein simply the finishing die is forged. In Fig. 10 the finishing pattern or die is provided on both sides with recesses 'illed with metal and shown at 36. These recesses were formed in the die by the retaining wall such as shown in Figs. 2 and 8.

As previously stated, the retaining wall may extend partially or wholly around the pattern, and in Fig. 11 I have shown a master die 37 having in cameo a pattern 38, I

the pattern being wholly surrounded by a re taining wall or projection 40. A retaining wall of this type or configuration will be employed when the shape of the pattern'is such that the continuous retaining wall is required to protect all parts of the pattern against breakage and to cause the pattern which is reproduced in the forged dies to have sharp lines and corners in all or different parts of the same, or where the sharp lines and corners are required. It will be understood that the retaining wall may, if desired, be formed in two or more separated sections which may be located opposite those portions of the pattern which require the use of the retaining wall.

Although I have shown the upper master die adapted to form the body of the die, the positions of the master dies may be reversed particularly when the forging machine consists of a hydraulic press, although when the master dies are employed in a drop hammer they are preferably in the relative positions shown.

In a companion application filed April 27, 1916, Serial No. 93,836, I have disclosed and am claiming master dies which are diflerent from those disclosed in this application, but which, nevertheless, are provided with the means for holding in or preventing the lateral movement of metal when the body of heated metal is being forged. The dies of the application just referred to may be used advantageously when certain forgings or forged dies are to be made.

In another co-pending application filed April 27, 1916, Serial N 0. 93832, I am claiming the method which is carried out by the master dies such as disclosed herein and in the companion application referred to above.

In still another co-pending application,

Serial No. 93,834, filed April 27, 1916, I am claiming the composite die which is produced in part by the master dies constituting the subject matter of this application.

Having thus described my invention, what claim is l. A master die adapted particularly for producing dies for drop hammers and the like, said master die having a pattern adapted to be impressed or reproduced in a body or block of metal to be forged and having between the pattern and the sides of the die means for restricting the lateral movement of metal during the forging operation.

2. A master die adapted particularly for the production of forged dies, said master die having a pattern adapted to be reproduced in a body or block of metal to be forged, and having between the pattern and sides of the die a projection adapted to cut or sink into the metal adjacent the pattern.

3. A master die adapted particularly for the production of forged dies, having a pattern adapted to be reproduced in the die to be forged and having means separate from the sides of the die and adjacent the pattern for protecting the pattern against breakage.

1. A master die adapted particularly for the production of forged dies, having a recess with the pattern at the base thereof and having between the pattern and the walls of the recess means for restricting the flow or movement of metal being forged.

5. A master die adapted particularly for producing forged dies for drop hammers, presses and the like, in the form of a hollow matrix having in its base a pattern and pro vided between the pattern and the walls of the matrix a projection extending partly or wholly around the pattern.

In testimony whereof, I hereunto aifix my signature.

ALBERT F. ARTHUR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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