Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1994-07-07
1996-04-30
Lin, Kuang Y.
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164113, 1641553, 1641554, 164305, B22D 1732
Patent
active
055116051
ABSTRACT:
A vacuum-controlling system for controlling the degree of vacuum in the vacuum system of a vacuum die-casting machine operates to: detect the degree of vacuum H at the instant of closure of the vacuum valve to the die mold cavity; compare the detected degree of vacuum H with a preset degree of vacuum Ho; correct a first position of the injection plunger for opening the vacuum valve by moving the first position in the advancing direction of the plunger by a specific distance in the case where H is higher than Ho; and correct the first position in the retracting direction of the plunger by a specific distance in the case where H is lower than Ho. By thus automatically correcting the position of the plunger for opening the vacuum valve to the optimum state, the formation of cavities or blowholes in the die-cast product is prevented, and at the same time, by maintaining the degree of vacuum in a specific state, the product quality is stabilized.
REFERENCES:
patent: 5022457 (1991-06-01), Iwamoto et al.
Lin Kuang Y.
Toshiba Kikai Kabushiki Kaisha
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