Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1997-10-08
2000-07-04
Lin, Kuang Y.
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164113, 1641555, 164312, B22D 1732
Patent
active
060824387
ABSTRACT:
A vacuum valve control system for a vacuum die casting machine that controls the opening and closing of a vacuum valve. The system comprises an input device for entering certain values, a detecting device for determining the position and speed of an injection plunger, a processor to calculate when the injection plunger has reached particular values for position and speed and a control device for opening and closing the vacuum valve when the particular values have been reached. The processor includes two counting devices, one to calculate the position of the injection plunger and one to calculate the speed of the plunger. The control device includes solid state relays which energize a solenoid to open the vacuum valve when the plunger has reached a certain position. The solid state relays also deenergize the solenoid to close the vacuum valve when either another particular position of the plunger has been reached or when the plunger is approaching a certain speed. By monitoring the speed and position of the injection plunger to control the vacuum valve, the chance that molten metal will be suctioned into the vacuum system of the vacuum die casting machine is greatly reduced.
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Nelson Edward M.
Zielinski Michael D.
Lin Kuang Y.
Outboard Marine Corporation
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