Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work
Patent
1983-04-20
1984-09-25
Gilden, Leon
Metal deforming
By application of fluent medium, or energy field
With actuated tool engaging work
72347, B21D 3908
Patent
active
044729553
ABSTRACT:
A punch is pressed on a blankpiece into a die. The die is filled with liquid therein, whereby hydraulic counterpressure is generated by said pressing. The pressed blankpiece is forcibly followed in shape around the punch by hydraulic counterpressure, while part of the hydraulic counterpressure is automatically supplied to an outer circumference of the blankpiece via bypath passage. In case, the blankpiece is a plate, said supplied hydraulic pressure serves as compression force from the outer circumference of the flange to the radius direction. In case, the blankpiece is a product formed by a first drawing, said pressure serves as pressing force toward axial direction of a side wall of the product. When the supplied hydraulic pressure flows out from a space between the punch and a blank holder, the liquid serves as lubrication on an upper and lower surfaces of the blankpiece.
REFERENCES:
patent: 3769824 (1973-11-01), Granzow
patent: 4314468 (1982-02-01), Baril
patent: 4361020 (1982-11-01), Hirota et al.
Nakagawa Takeo
Nakamura Kazuhiko
Amino Iron Works Co., Ltd.
Gilden Leon
Striker Michael J.
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