軸承座 : 王勇
聯系地址 : 常州市武進區雪堰鎮漕橋
發布時間 : 2018-11-07 11:41:14 訪問量 : 2340次
After the mold is opened, wax injection operation can be carried out. Wax injection operation should pay attention to factors such as wax temperature, pressure and compression of mold.
The wax used in making wax models is usually blue model paraffin. Its melting temperature is about 60 C and the injection temperature is about 65 C. There are also some other colors of paraffin, which are slightly different in nature. Wax temperature and injection pressure are determined by wax injection machine. There are two types of wax injection machines: air pressure type and vacuum type. The wax injection principle of the two wax injection machines is basically similar, that is, the melted wax is injected into the rubber mold by air pressure. The difference between the two is that the vacuum wax injector can vacuum the rubber mould first and inject wax into the rubber mould, while the air-pressure wax injector can only inject wax directly into the rubber mould. So it is easy to operate vacuum wax injector, while air pressure wax injector needs some experience.
The heater and thermoscope in the wax injection machine can make wax liquid reach and maintain a certain temperature. Usually the temperature of wax in the wax injection machine should be kept between 70 and 75 degrees Celsius, which can ensure the fluidity of wax liquid. If the temperature is too low, the wax liquid is not easy to fill the wax mold, resulting in the wax mold defects; conversely, the wax liquid temperature is too high, which will cause the wax liquid to overflow from the gap of the rubber mold or from the wax injection mouth, easy to form flash or burn fingers.
The pressure in wax drum of wax injection machine is provided by external air pump. It should be kept between 0.5 and 0.7at (or kgf/cm2), i.e. 0.051 to 0.071Bar. It can also be adjusted appropriately according to the size and complexity of wax mould.