IMPROVEMENT TO THE PROCESS FOR THE LOST-FOAM CASTING, UNDER CONTROLLED 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.