ADAPTIVE CONTROL OF DATABASE BASED LOW PRESSURE AL DIE CASTING MACHINE WITH ACQUISITION OF THE DYNAMIC DISPERSION OF THE METAL FRONT WITHIN THE DIE

摘要

The quality of castings significantly depends on the constancy of optimal cast parameters for the specific die and alloy. This paper presents the modifications of an existing die casting machine guarantying a constant quality of the cast process by automatically adapting the optimal parameters even during variations of alloy compositions and temperature of the melt. Therefore the control implies a database based model of the fluidity of certain alloys and their variations. The optimal casting parameters are often identified by simulation. These simulations are hard to verify, habitually in time consuming fill-and-stop casts with partial fillings. Against, the described control system allows the acquisition of the dynamic dispersion of the metal front within the die for every cast enabling a fast analysis of actual casting parameters or a quick verification of the simulation. The required combined metal-front and temperature sensors have been developed ad hoc for this control system.