Processing technology of precision injection mold cavity parts
1) Plastics have the advantages of light weight, large specific strength, good insulation, high molding productivity and low price. Plastics have become a good substitute for metals, and there is a trend towards plasticization of metal materials.
2) Due to the development requirements of lightweight and low energy consumption, the material composition of auto parts has undergone obvious changes in replacing steel with plastic. From the perspective of the application of automotive plastics at home and abroad, the amount of automotive plastics has become an important symbol to measure the technical level of automobile production.
3) Injection molding
Because it can form a variety of products with complex structure, precise size and metal inserts at one time, and the molding cycle is short, it can be a mold with multiple cavities, and the old cost is low when mass production, and it is easy to realize automatic production, which occupies an important position in the plastic processing industry.
For injection mold processing, the hardness of the cavity part is generally required to be one value, and occasionally higher. The processing methods that can be used after thermal disposal are limited to special processing such as grinding, electrical processing and chemical corrosion, but CNC milling and machining centers can also be used to process, but the cost of the tool is expensive, so the focus of the process is how to divide which processing is placed before thermal disposal and which is placed after thermal disposal, so as to minimize the old cost, improve efficiency and wrap quality.
Due to the variety of plastic parts themselves, the structure of cavity parts is also very different. Different from the template, simply describing the process of a cavity part is not meaningful, our opinion is that a small amount of high-quality alloy steel with less thermal treatment deformation should be selected in the selection of materials, so that for smaller parts, it can be processed in place once before thermal disposal, and the finished part is simply polished after vacuum thermal disposal. Secondly, for general parts, such as screw holes, waterway holes, pusher pre-holes, etc., they need to be processed before hot disposal, and the surface of the cavity and core leaves a finishing allowance. Third, as with the process of formwork, do a good job of benchmark conversion before and after thermal disposal. The process route of cavity parts can be defined as coarse, semi-fine turning or milling, thermal disposal, fine grinding, electrical machining or surface disposal, polishing, etc.
In order to improve the quality of injection mold processing, in addition to improving the design level, it is crucial to grasp the process arrangement of this link Good process arrangement is the premise of injection mold processing, in order to improve the quality of injection mold processing, we must first improve the process level.