Obtaining Castings in Low-pressure Casting Using Multiple Metal Wires

Abstract

The possibility of using two metal wires for casting into a double mold on the installation of the U95A model was considered, and the influence of pouring each casting into a double mold from a separate metal wire on the quality of filling of the contours of the casting surface was studied. The research results were compared with the results of casting a double mold from a single metal wire. We used standard methods for determining the speed of mold filling, the quality of the surface of castings, and the filling capacity of the mold from several metal wires. To conduct a study on filling multi-seat forms from several metal wires, a double chill of the part “filter housing” was used, consisting of two side parts of the upper rod and a rotary pallet. To conduct the experiment, a new tray, and a new cover for the crucible of the filling device were developed for the existing equipment. The main parameter for conducting research was the fill rate. The estimated speed of filling the form was controlled during the research by the time of filling the form cavity. Improved system of metal supply to the casting at the low-pressure casting unit of the U95A model when filling multiseat forms from several metal wires, which allows to increase the productivity of the installation without significant changes in its design or its modernization. The conducted research allowed us to determine the possibility of using two metal wires installed in the furnace lid, showed better filling of the contours of the casting surface due to a decrease in the rate of metal entering the mold, simplification and reduction of the length of the gating system. Reducing the speed helps to fill the form more smoothly without disconnecting the flow of liquid metal. No leaks of compressed air were detected, and the rate of pressure increase in the furnace crucible remained the same as when using a single metal wire.