Three factors determine the quality of plastic mold processing
1, because the mould is to develop in the direction of large-scale, several tons to dozens of tons of mould is very common, so the requirement of machine tool working mesa can withstand the weight, which requires the equipment must have a big load and the characteristics of high rigidity, must also have a large enough size and working mesa trip with other corresponding to strength and hardness of the die material is very high, and often USES the elongation of small diameter end milling cutter machining mold cavity, so prone to flutter of nc machining process.In order to ensure the machining accuracy and surface quality of the parts, the high-speed universal milling machine manufactured by the mold must have high dynamic and static stiffness to improve the positioning accuracy, tracking accuracy and anti-vibration capability of the machine tool.
2. High speed machining and high power high speed machining are the development direction. High speed milling has shown great advantages in die machining.In order to adapt to the mold cavity surface processing, tool radius should be less than minimum radius of circular of cavity surface, in order to avoid machining tool and workpiece during the process of "interference" because of the small diameter cutter, so the spindle speed is very demanding, foreign high speed machine tool spindle speed has reached 40000 ￣ 100000 r/min, fast feed speed can reach 30000 ￣ 30000 min.Rough and finish machining of other parts of the mold cavity and mold parts is usually done in the workpiece assembly. Therefore, the spindle power should be large, and the spindle power of medium size mold milling machine and machining center is usually 10-40kw, some even higher.
3. The mold cavity with multi-axis linkage and good comprehensive cutting ability of deep hole cavity is mostly composed of complex space hexagon surface and groove, and many molds have deep hole cavity.In order to achieve high precision, high speed and high stability machining of 3d curved surface, the machine tool needs multi-axis linkage and has good comprehensive cutting capacity of deep hole cavity.The five-axis machining center can be used, in addition to the linear motion of three coordinates, there are two feeding motions of rotating coordinates.The milling head or working table can be used for continuous rotary feed, which is suitable for machining die parts with complex cavity surface.It can be said that compound machining is one of the development directions of die machining