The manufacturing of precision molds is inseparable from those advanced processing equipment. The main processes of precision mold manufacturing include CNC milling, wire cutting, EDM, grinding, turning, measurement, automation, etc.
① CNC milling has developed from traditional ordinary milling machines to three-axis machining centers, and then to today's five-axis high-speed milling, making the processing of complex three-dimensional parts almost a reality, and the hardness of the material is no longer a limitation. . The main cavities and surfaces of plastic molds are completed by CNC milling. The rapid development of the plastic mold manufacturing industry is mainly due to the innovation of CNC milling technology.
② Slow wire cutting processing Slow wire cutting processing is mainly used for processing two-dimensional and three-dimensional ruled surface parts such as various punch dies, plastic molds, powder metallurgy molds, etc. Among them, the processing of stamping dies accounts for the largest proportion. For the processing of many precision holes such as the punch, punch fixed plate, concave die and discharge plate of the stamping die, slow wire cutting processing is an indispensable key technology. In the manufacturing of injection molds, common applications include insert holes, ejector holes, inclined top holes, cavity corners and slides. Generally speaking, the processing accuracy requirements are not as high as those of stamping molds. Slow wire processing is a high-precision processing method. High-end machine tools can achieve a processing accuracy of less than 3μm, and the surface roughness can reach Ra0.05μm. At present, automatic threading and cutting of electrode wires of 0.02 to 0.03mm can be realized, and the practical cutting efficiency can reach about ㎜2/min.
③Electrical discharge machining Electrical discharge machining is suitable for processing complex components such as precision small cavities, narrow slits, grooves, and corners. When it is difficult for the tool to reach complex surfaces, where deep cutting is required, and where the aspect ratio is particularly high, the EDM process is superior to milling. For the processing of high-tech parts, milling electrode re-discharge can improve the success rate. Compared with high and expensive tool costs, electrical discharge machining is more suitable. In addition, where EDM finishing is specified, EDM is used to provide a spark-marked surface.
④Grinder processing: The grinder is a precision equipment for finishing the surface of parts, especially hardened workpieces. The grinding machines used in mold processing are mainly surface grinders, universal internal and external cylindrical grinders, and coordinate grinders (PG optical curve grinders). Small flat grinders are mainly used to process small-sized mold parts, such as precision inserts, precision mold cores, sliders, etc. Large water grinders are often used for larger size formwork processing. Nowadays, it has become a common trend to increase the linear speed of surface grinder grinding wheels and the movement of worktables. Due to the use of advanced functional component technologies such as linear guide rails, linear motors, and static pressure screws, the movement speed has been greatly improved. In addition, it has also been continuously improved. Grinding wheel dressing technology.
⑤CNC lathe CNC lathe is also a commonly used processing equipment in mold workshops. Its processing scope is all rotary body parts. Due to the high development of CNC technology, complex-shaped rotary bodies can be easily realized through programming, and machine tools can automatically change tools, greatly improving production efficiency. The processing accuracy and manufacturing technology of CNC lathes are becoming increasingly perfect, and there is even a trend of using lathes instead of grinding machines. It is often used to process circular inserts, supports, positioning rings and other parts in molds.
