Forging die and upset forging method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 26, 2001
Grant Date -
N/A
app pub date -
Oct 13, 1999
filing date -
Apr 22, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An upset forging die device and method are provided for upset-forging a raw material that is being filled in a cavity of a lower molding die at a portion between an upper punch of an upper molding die provided on a slide and a lower punch of the lower molding die provided on a bolster. The upper and lower punches are provided with an upper pin and a lower pin respectively so that a first end of each pin is protruded and withdrawn from each of end surfaces of the upper and lower punches and the pins are vertically movable in the upper and lower punches respectively, while a second end of the upper and lower pins is applied with a back-pressure. The back-pressure is applied to each of the upper and lower pins by causing a hydraulic oil supply to supply hydraulic oil to hydraulic cylinders at a time of a molding operation, and the respective back-pressures are removed by switching a solenoid valve to take a communicating position to discharge the hydraulic oil to an oil tank just before the cavity is completely filled up with the raw material.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully