Drawing mechanism for a press

Details Drawing mechanism for a press Drawing mechanism for a press

1996-10-11

1998-05-05

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

7245313, B21D 2414

Patent

active

057460841

ABSTRACT:
A drawing mechanism for a press has a drawing slide and a plate holder with a plate held therein. A holding force, which acts against the drawing direction, can be applied to the plate by way of a piston rod which can be displaced in parallel to the drawing direction. A control accelerates the plate holder in the drawing direction before the drawing slide is placed on the plate holder because the plate holder is rapidly acceleratable independently of the drawing slide. A pre-acceleration cylinder is fixed to the press and has a pre-acceleration piston which is operatively connected with the piston rod. The pre-acceleration cylinder has first and second effective surfaces of different sizes which act in opposite directions, and a first and a second pressure chamber.

REFERENCES:
patent: 2674138 (1954-04-01), Mize
patent: 4499750 (1985-02-01), Gerber et al.
patent: 4896594 (1990-01-01), Baur et al.

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