Drawing tool

Details Drawing tool Drawing tool

1989-03-10

1990-03-20

Larson, Lowell A.

Metal deforming

With cutting

By shearing tool-couple

72351, 72347, B21D 2222

Patent

active

049090615

ABSTRACT:
The drawing tool comprises a hydraulic element for deriving from the movement of the blank holder a simultaneous, oppositely directed movement of the drawing punch. The hydraulic element comprises a centrally disposed working piston, an annular piston, which surrounds that working piston, and a cylinder, which surrounds the annular piston. The working piston and the annular piston are adapted to be supplied with pressure fluid from first and second cylinder chambers which are hydraulically separated from each other and which are adapted to communicate with each other under the control of at least two alternative flow paths, which differ in hydraulic design so that they cause pressure changes on different pressure levels to be effected in the second cylinder chamber. A pressure detector detects the pressure of the fluid in the cylinder chambers and enables an alternative flow path in response to a rise of the pressure above a predetermined limit. As a result, a low-cost, compact tool has been provided, which can be used to make even parts which can be drawn only with great difficulty owing to their desired final shape and/or the material from which they are made.

REFERENCES:
patent: 1967245 (1934-07-01), Hothersall
patent: 2609775 (1952-09-01), Gaudreau
patent: 3372569 (1968-03-01), Bozek
patent: 4796453 (1989-01-01), Reitter

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