Patent ID: 6405784
Filing Date: 2002-06-18
Classification: B22D,Y10S

Abstract:
An injection molding method of metal mold, comprising steps of:supply continuously or discontinuously granular metal material in a cylindrical fusion vessel having a required length of weighing chamber communicating with a nozzle port at an extremity section, including rotatively an agitation means inside, and where an injection means whose extremity section is formed into an injection plunger is inserted retractably into a center section of this agitation means, for engaging slidably said injection plunger into the weighing chamber, heat melting the metal material to a temperature equal or superior to the liquid phase line temperature by an external heat and, at the same time, accumulating in the fusion vessel by homogenizing by the aforementioned agitation means, injecting and filling a die by cooling the metal material to a temperature equal or superior to the solid phase line temperature and equal or inferior to the liquid phase line temperature in the course from a feed into the weighing chamber by the retraction of the aforementioned injection plunger to the injection and filling of the die, and forming the metal material into a metal mold having a thixothropic structure.