SETT ATT REGLERA HASTIGHETEN VID FYLLNING AV GJUTFORMAR SAMT ANORDNING FOR SETTETS UTFORANDE

摘要

A method of controlling the rate of filling of a casting mold wherein a pressure P1 is applied to a chamber containing a crucible holding the molten material to be cast, a pressure P2 is provided in a chamber containing the mold, the mold is connected with the crucible by a tube conveying the molten material to the mold, and the molten material is displaced through the tube by a pressure differential DELTA p equal to P1-P2, which comprises detecting the time derivatives dP2/dt and d DELTA P/dt of the pressure in the chamber containing the mold and the pressure differential, respectively. The rate of variation of the pressure in the chamber of the mold is monitored to regulate the process while one of the other derivatives is compared with a set point value to control one of the pressures as a function of time to vary the rate of filling of the mold in accordance with a predetermined program.