Method and apparatus for eliminating entrapped gas in die castings

摘要

In a die casting machine a shot of molten material is transferred through an injection tube at a relatively slow speed so that all the gas present in the tube is forced out through the associated die. When a first portion of the molten material reaches the die cavity, the event is automatically sensed by circuitry which commands the machine to transfer the remainder of the molten material through the injection tube at a relatively fast speed and cause injection thereof into the die.