Die-casting method and apparatus

Details Die-casting method and apparatus Die-casting method and apparatus

1985-05-22

1986-05-06

Godici, Nicholas P.

Metal founding

Process

With measuring, testing, inspecting, or condition determination

164 65, 164133, 164155, 164257, 164305, B22D 1714, B22D 1732

Patent

active

045865604

ABSTRACT:
A die-casting apparatus is used to carry out a die-casting method in which an injection plunger is moved forwardly at a lower speed and then is temporarily stopped at a forward stroke intermediate position in which a space defined by the injection plunger and an injection sleeve is substantially filled with an amount of molten metal. Then, evacuation of a product cavity and the injection sleeve is commenced and, after the lapse of a predetermined time period, the injection plunger is again moved forwardly at a higher speed to inject the molten metal from the injection sleeve into the product cavity. Compared with the prior art, the method provides an increased evacuation time period and assures a reduction in the volume to be evacuated. In addition, the higher injection stroke reduces possibility that air and gases are trapped in the molten metal to provide die-cast products of a high quality.

REFERENCES:
patent: 3542330 (1970-11-01), Wirtz
patent: 4146081 (1979-03-01), Reis
patent: 4347889 (1982-09-01), Komatsu et al.
patent: 4431047 (1984-02-01), Takeshima et al.
patent: 4463793 (1984-08-01), Thurner

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