Method and apparatus for pressure control in a press

Details Method and apparatus for pressure control in a press Method and apparatus for pressure control in a press

1979-06-11

1982-06-15

Miller, Edward A.

Plastic and nonmetallic article shaping or treating: processes

Explosive or propellant article shaping or treating

Rolling to form sheet or rod

264 405, 425150, C06B 2100, B29C 306

Patent

active

043350631

ABSTRACT:
A method for the multi-stage compression of a mass in a press, especially an extrusion press containing plastic or elastic masses. The mass to be extruded is precompressed up to a preliminary pressure by the rapid advance of the pressure piston. The initial advance takes place at a high rate without the occurrence of impermissibly high temperatures of the mass or the enclosed gas. The subsequent compression to higher pressure levels takes place in a sequence of stages in each of which the rate of advance of the pressure piston is constant. The rate of advance is increased from stage to stage until a final extrusion pressure is reached. An apparatus for carrying out the method of the invention includes a hydraulic flow rate regulator which is controlled on the basis of signals that are related to the pressure measured in the hydraulic system. The pressure signals may be derived by potentiometers energized by pressure-dependent switches.

REFERENCES:
patent: 3647309 (1972-03-01), Thompson
patent: 3689188 (1972-09-01), Kopp
patent: 3825386 (1974-07-01), Bello et al.
patent: 3857658 (1974-12-01), Muzsnay
patent: 3893792 (1975-07-01), Laczko
patent: 4076780 (1978-02-01), Ditto
patent: 4161380 (1979-07-01), Bishop

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