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How to judge the quality of plastic mold processing

1. As molds are developing in the direction of large-scale, molds of several tons to dozens of tons are very common, so the machine tool table must be able to bear heavy weight, which requires the equipment to have large load-bearing and high rigidity characteristics, and it must have enough The large table size and working stroke are compatible with it. The strength and hardness of the mold material are high. In addition, small diameter end mills with large elongation are often used to process the mold cavity, so chatter vibration is prone to occur during the processing. In order to ensure the machining accuracy and surface quality of the parts, the high-speed* milling machine for mold manufacturing must have high dynamic and static stiffness to improve the positioning accuracy, tracking accuracy and vibration resistance of the machine tool.

2. High-speed and high-power high-speed machining is the development direction. High-speed milling has shown great advantages in mold processing. In order to adapt to the machining of the mold cavity surface, the radius of the tool should be smaller than the radius of the cavity surface * small circumference, so as to avoid “interference” between the tool and the workpiece during the processing. Because the tool diameter is small, the spindle speed is required to be very high. Foreign high-speed machining machine tool spindles The speed has reached 40,000 ~ 100,000 r/min, and the rapid feed rate can reach 30,000 ~ 60,000 min. The roughing and finishing of cavity and other parts of mold parts are often completed in one clamping of the workpiece, so the spindle power must be large. The spindle power of medium-sized mold milling machines and machining centers is often 10-40kw, and some are even higher.

3. Multi-axis linkage and good deep cavity comprehensive cutting ability. Most mold cavities are composed of complicated spatial six-curved surfaces and grooves, and many molds have deep cavities. In order to achieve high-precision, high-speed and high-stability machining of 3d curved surfaces, the machine tool needs multi-axis linkage and has a good comprehensive cutting ability for deep holes. A five-axis linkage machining center can be used. In addition to the linear motion of the three coordinates, there are also two feed motions of the rotating coordinates. The milling head or worktable can continuously rotate and feed in multi-axis linkage, which is suitable for processing mold parts with complex cavity surfaces. It can be said that compound processing is one of the development directions of mold processing.

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