Process of dewaxing casting
The wax temperature and injection pressure are determined by wax injection machine. The types of wax injection machines usually have two types: air pressure type and vacuum type. The principle of wax injection of the two kinds of wax injection machines is basically similar, that is, the wax is injected into the glue mould by using air pressure. The difference between them is that the vacuum type wax injection machine can vacuum the mold first and glue the wax to the glue mould. So it is easy to control the vacuum wax injection machine, and the pneumatic wax injection machine needs some experience. The heater and temperature sensor in the wax injection machine can make wax liquid reach and maintain a certain temperature. Normally, the wax temperature in the wax injection machine should be kept between 70~75 degrees centigrade, so that the temperature can guarantee the fluidity of the wax liquid. If the temperature is too low, the liquid wax is not easy to fill the wax wax, resulting in incomplete; and the wax liquid temperature is too high, it will lead to the liquid wax from the rubber mold gap from the mouth overflow overflow or wax, easy to form flash or burn your fingers.
The process of lost wax casting: mold design - mold - injection wax (mold) - dressing wax (welding wax), ash (weighing) - shell mold made of shell mold casting, shell vibration - roasting - sand cleaning treatment processes were described below. The product mold is usually the mold is used, the aluminum mold also has the use of steel mold, but it is not convenient to use, the factory to get the drawings, engineering parts, according to the drawings to design the corresponding mold, the design of the gate. Then use aluminum material, through numerical control machine tool a series of processing, make mold. Two. After the wax injection mold is opened, the wax injection operation can be carried out. The operation of wax injection should pay attention to such factors as wax temperature, pressure and compression of glue mould. Making use of the wax wax is paraffin model blue, the melting temperature at 60 degrees Celsius, the wax temperature at 65 degrees celsius. There are some other colors of wax, slightly different in nature.
