IMPROVEMENT TO THE PROCESS FOR THE LOST-FOAM CASTING, UNDER¹CONTROLLED PRESSURE, OF METAL ARTICLES

摘要

In the process for the lost foam casting of metal pieces under controlled pressure, the pressure is initially caused to increase at a rate of between 0.003 and 0.3 MPa/sec over a first period of at most 5 seconds from the start of the pressure rise, then at a rate greater than that of the first period over a second period until maximum pressure is reached. …??The process makes it possible to obtain pieces with a shape corresponding to the model and without porosities.