Method and apparatus for diagnosing press cushioning device, on

Details Method and apparatus for diagnosing press cushioning device, on Method and apparatus for diagnosing press cushioning device, on

1994-04-26

1995-12-05

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

7245313, B21D 2408

Patent

active

054718619

ABSTRACT:
Method and apparatus for diagnosing a cushioning device of a press, wherein an optimum range of a blank-holding force acting on a pressure member through a cushion platen, balancing hydraulic cylinders and cushion pins is determined on the basis of a rate of change of the detected hydraulic pressure in the hydraulic cylinders with a change of the blank-holding force, or on the basis of the detected blank-holding force and hydraulic pressure and according to a predetermined formula formulated on the basis of specifications of the cushioning device. Where the rate of change of the detected hydraulic pressure is used for diagnosing the cushioning device, the optimum range of the blank-holding force is determined if the rate of change of the hydraulic pressure with the blank-holding force is substantially constant, or is substantially equal to a reference value determined on the basis of the specifications of the cushioning device.

REFERENCES:
patent: 3564883 (1968-07-01), Koors et al.
patent: 4601190 (1986-07-01), Schneider et al.
patent: 4745792 (1988-05-01), Story et al.
patent: 5138857 (1992-08-01), Siegert
patent: 5241849 (1993-09-01), Baur
patent: 5255552 (1993-10-01), Bielfeldt
European Search Report dated Sep. 29, 1993 (2 pages) Communication dated Oct. 18, 1993 (1 page).
European Search Report dated Jan. 24, 1994 (2 pages) Communication dated Mar. 22, 1994 (1 page).
European Search Report dated Aug. 22, 1994 (2 pages) Communication dated Sep. 8, 1994 (1 page).

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