Shot cylinder controller

Details Shot cylinder controller Shot cylinder controller

1981-12-16

1984-12-18

Lin, Kuang Y.

Metal founding

Control means responsive to or actuated by means sensing or...

Control of feed material enroute to shaping area

164457, B22D 1732

Patent

active

044885890

ABSTRACT:
A die casting machine has a hydraulic shot ram controlled by a servo system that includes pre-settable thumbwheel switches to establish a desired memory of shot speed values and shot position presets in a programmable computer. An analog output responsive to the control program in the programmable computer produces a direct current analog velocity command signal. A servo amplifier includes means for comparing the command analog signal and a feedback signal from transducers sensing velocity of the hydraulic ram and position of valve means to produce an on-off servo valve signal so that a servo valve will modulate flow from a third state Olmsted shot valve so as to compensate for shot speed changes produced by changes in operational conditions including wear and build-up on a cylinder and ram; hydraulic oil heat-up during operation of the machine; and changes in flow characteristics of a molten metal due to temperature variations thereof.

REFERENCES:
patent: 3726334 (1973-04-01), Sallberg
patent: 4252176 (1981-02-01), Page
patent: 4330026 (1982-05-01), Fink

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