Apparatus for controlling dynamic characteristics of press load

Details Apparatus for controlling dynamic characteristics of press load Apparatus for controlling dynamic characteristics of press load

1985-07-23

1986-07-15

Sipos, John

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

72 21, 267119, B21J 918

Patent

active

045998876

ABSTRACT:
An apparatus, for controlling dynamic characteristics of a press load, facilitates changing the balance between a hydraulic pressure and a pneumatic pressure in a hydroblank holder, wherein a first pneumatic device which supplies a standard pneumatic pressure with which a predetermined dynamic load can be obtained and a second pneumatic device which supplies a pneumatic pressure higher or lower than the standard pneumatic pressure are provided in parallel in a pneumatic device which supplies pneumatic pressure to the hydroblank holder and the first and second pneumatic devices are switched in accordance with a press stroke and, when the switching is made to low pressure, an accumulator is depressurized by the operation of a depressurizing device.

REFERENCES:
patent: 2920675 (1960-01-01), Hatch
patent: 3653301 (1972-04-01), Clendenin et al.
patent: 3914978 (1975-10-01), Sekanina et al.
patent: 3962895 (1976-06-01), Rydell
patent: 4056965 (1977-11-01), Heiser
patent: 4210165 (1980-07-01), Kitsugi

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