For precision injection moulds, the hardness of the cavity is generally required to reach a value, sometimes higher. After the heat treatment can be used in the processing method is limited to grinding, electric processing and chemical etching and other special processing while also can be used to CNC milling, machining center processing, but the cost of the tool is expensive, so the key process procedure is how to divide which processing before the heat treatment, which after the heat treatment, in order to minimize costs and improve efficiency and ensure the quality.
Due to the variety of plastic parts themselves, resulting in the cavity of the structure is also very different. Is different from the template, simply tells a mold pieces of the general process, our opinion is that there is first of all on select material should choose some high quality alloy steel, heat treatment deformation is small for smaller parts that can be a process in place before heat treatment, vacuum heat treatment after simple after polishing is the finished products. Secondly, for the general parts, such as screw holes, waterway holes, push rod pre-hole and so on need to be processed before the heat treatment, cavity, core surface leave margin for finishing. Third, the same as the template process, do a good job before and after the heat treatment of the benchmark conversion work. The process route of cavity parts can be defined as rough, semi-fine turning or milling, heat treatment, fine grinding, electrical processing or surface treatment, polishing and so on.
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