Method of and apparatus for automatically controlling pressure i

Details Method of and apparatus for automatically controlling pressure i Method of and apparatus for automatically controlling pressure i

1987-01-16

1988-05-03

Godici, Nicholas P.

Metal founding

Process

With measuring, testing, inspecting, or condition determination

164155, B22D 1732

Patent

active

047413816

ABSTRACT:
Disclosed is a method of and an apparatus for automatically controlling the pressure in a holding furnace incorporated in a low pressure die-casting system in accordance with a desired pattern. A proportional pressure control valve operated by a microcomputer is provided in a pressurized gas supply circuit for supplying pressurized gas into the holding furnace. The pressure in the holding furnace is changed in accordance with a pattern which is as close as possible to a desired pressurization pattern by sending to the proportional pressure control valve a command value obtained by adding to an input command value of the proportional pressure control valve a correction value calculated by a predetermined computing method.

REFERENCES:
patent: 3861457 (1975-01-01), Py
patent: 4585050 (1986-04-01), Merrien et al.

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