Method for molding metal using high fluid pressure

Details Method for molding metal using high fluid pressure Method for molding metal using high fluid pressure

2000-04-07

2001-06-26

Jones, David (Department: 3725)

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

C072S060000, C072S061000

Reexamination Certificate

active

06250121

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a method for molding metals using high fluid pressure. As used herein, “fluid pressure” can include that of oil pressure, water pressure, or the like. “Method for molding” is used to indicate that fluid pressure is applied to a raw material to perform a molding of same into article shape.
Conventionally, articles having complex shapes including gears and the like have been molded using a female/male mold unit, i.e., a die and an punch. An example of this is described in Japanese laid-open patent publication number 5-154598.
In Japanese laid-open patent publication number 5-154598, a metal raw material is placed in a die. A punch is used to perform molding. In the molding operation, the punch and the metal raw material come into contact under high pressure so that resistance is generated between the two. This resulted in the fluidity of the metal material not always being adequately matched with the shape of the cavity.
This problem is not restricted to the molding operation disclosed in Japanese laid-open patent publication number 5-154598. It applies to all similar types of molding that use a die and a punch.
Japanese laid-open patent publication number 10-175028 and Japanese laid-open patent publication number 10-296347 are examples of conventional technology in which molding is performed using fluid pressure. In the former, a hydroform method involves a metal pipe, e.g., a copper pipe, placed in a split mold. An internal pressure, applied to the pipe, in the direction of the axis of the pipe, molds the pipe into a predetermined shape to form an article in the form of a bellows-pipe. In the latter publication, a fluid-pressure bulge processing method is presented. Internal pressure from fluid in a metal pipe is combined with axial compression of the metal pipe in order to expand a section of the metal pipe.
In both of these technologies, hollow piton-shaped members are disposed on either side of the metal pipe, which serves as the raw material. The piston-shaped members feed pressurized oil to the inner diameter of the metal pipe and push the metal pipe from both ends. These piston-shaped members are inserted into holes disposed in a split mold. The hollow section of the piston-shaped member serves as an oil passage through which the pressurized oil is fed. A sealing member is generally mounted to the outer diameter section of the piston-shaped member to prevent the fluid from leaking.
Due to its purpose, the sealing member must be flexible, so its resistance to pressure is limited. For example, such a sealing member generally cannot withstand a fluid pressure of approximately 2000 Mpa. Thus, high-pressure molding, using this method has not been conventionally possible. In both of these technologies, a high degree of process ability is provided by using the piston-shaped members to press from both ends of the raw material.
SUMMARY OF THE INVENTION
An object of the present invention is to provided a molding method using a fluid-pressure generating unit capable of generating high pressures that allows high-precision molding of complex shapes that conventional methods could not produce.
A piston for generating high fluid pressure is disposed in the bore passage of a metal mold, the bore passage being in registry with an entry to a cavity in the metal mold so that a workpiece at least partly in the cavity can have a high fluid pressure, produced with the piston, imposed on it. This pressure imposed on the workpiece causes the raw metal material thereof to be pushed into the cavity and to assume in said cavity an article shape having an external configuration corresponding to an internal geometry of said cavity thereby forming an article of desired shape.


REFERENCES:
patent: 1766098 (1930-06-01), Booth
patent: 2592867 (1952-04-01), Cuq
patent: 2688297 (1954-09-01), Livermont et al.
patent: 2767765 (1956-10-01), Cartwright
patent: 3335590 (1967-08-01), Early
patent: 3611768 (1971-10-01), Odagaki
patent: 4265102 (1981-05-01), Shimakata et al.
patent: 4590655 (1986-05-01), Javorik
patent: 5022135 (1991-06-01), Miller et al.

Affiliated with

Also associated with

Rating

Method for molding metal using high fluid pressure does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for molding metal using high fluid pressure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for molding metal using high fluid pressure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2457311