Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1996-12-09
1999-02-09
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72473, B21J 1302
Patent
active
058680268
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the National Stage under 35 USC 371 of PCT International Application PCT/US94/12412, filed, 28 Oct., 1994. It is related to U.S. application Ser. No. 08/783,551 filed 14 Jan., 1997, which is a continuation of U.S. application Ser. No. 08/467,159, filed 6 Jun., 1995, now U.S. Pat. No. 5,592,847, which was a continuation of U.S. application Ser. No. 08/169,300, filed 17 Dec., 1993, now abandoned.
FIELD OF THE INVENTION
This invention is concerned with the forging of large workpieces of metal and the like, especially large structural parts.
BACKGROUND OF THE INVENTION
When forging large structural parts for aerospace and similar applications, the total force of the forging press generally places an upper limit on the plan area of the workpiece. Once this upper limit of plan area has been reached for a given available press, the formation of structural parts of larger sizes generally requires that the part be forged in separate pieces and then assembled into a finished large part. The increasing sophistication of aircraft design and other similar technologies has increased the demand for larger and larger structural parts. On the other hand, the limit on the economic availability of large-force forging presses and the serious economic and practical problems of joining smaller subelements together to form large forged pieces have created serious difficulties in manufacturing large forged structural parts. These and other difficulties experienced by the prior art have been obviated in a novel manner by the present invention.
It is, therefore, an outstanding object of the present invention to provide a system for increasing the size of workpieces which can be manufactured in a given forging press.
Another object of this invention is to provide a system by which a given workpiece can be forged using a smaller capacity forging press.
With these and other objects in view, as will be apparent to those skilled in the art, the invention resides in the combination of parts set forth in the specification and covered by the claims appended hereto.
SUMMARY OF THE INVENTION
This invention is a system for enhancing the performance of a forging press by increasing the size of the workpiece which can be effectively forged within the capacity of the forging press. The system includes the provision of a die set in which one or more of the dies is segmented, that is divided into two or more, and preferably three or more parts. The segmented die is provided with advancement means which allow each of the segments to be selectively advanced ahead of the other segments along the forging axis. The dies are installed in the forging press by mounting each die directly or indirectly to a respective die bed. In advancement means is employed to cause one of the segments to advance and be locked ahead of another segment. The workpiece is forged so that the advanced segment is a primary forging agent, that is, it transfers the vast majority of the force to the workpiece. The non-advanced segments are secondary forging agents, that is, they act only to control the reaction of other portions of the workpiece. Subsequently, the role of the segments is reversed, in steps, so that the formerly non-advance segment is advanced beyond the formerly advanced segment. The process of forging is then carried out again with the newly advanced segment or segments acting as the primary forging agent. By conducting this closed-die forging operation in this stepped manner with a segmented die, the total effective force is applied serially over several sections of the workpiece so that each section of the workpiece is effectively exposed to a greater forging pressure and, therefore, more forging work can be done on the workpiece. Conversely, a given available forging force can be used to form a greater size of workpiece. In the preferred embodiment, the segments would be selected for advancement in such a way that the area of the workpiece subject to the primary forging agents in each step r
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Palitsch John R.
Sarkisian John M.
Zecco Joseph J.
Larson Lowell A.
Wyman-Gordon Company
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