The characteristics that the machine tool needs to achieve high-speed machining of the mold

With the continuous development of mold technology, with the acceleration of the upgrading of consumer products, higher and higher requirements are put forward for the production efficiency and manufacturing quality of molds. The production efficiency of EDM molds is low and the quality is unstable. Gradually exposed. To shorten the manufacturing cycle and reduce costs, advanced cutting technology must be widely used. These machine tools mainly include various high-speed CNC milling machines and machining centers.

In order to achieve high-speed machining of the mold cavity and its related parts, the machine tool needs to have the following characteristics:

(1) Large load-bearing and high rigidity This is because the mold is developing in the direction of large-scale, and the processing equipment must have a sufficiently large table size and working stroke to adapt to it. Nowadays, molds of several tons to several tens of tons are very common, requiring machine tool work surfaces to withstand large weights. The strength and hardness of the mold material are very high, and the mold cavity is often processed by a small-diameter end mill with a large elongation, so that the process is prone to chattering. In order to ensure the machining accuracy and surface quality of the parts, high-speed machine tools used in mold manufacturing must have high dynamic and static stiffness to improve the positioning accuracy, tracking accuracy and vibration resistance of the machine.

(2) High-speed and high-power high-speed machining is the development direction, and 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 minimum circumferential radius of the cavity surface to avoid "interference" between the tool and the workpiece during the machining process. Due to the small diameter of the tool, the spindle speed is very high. The spindle speed of foreign high-speed machining machine tools has reached 40000~100000r/min, and the fast feed speed can reach 30,000~60000min. The cavities and other parts of the mold parts are often finished in a single clamping of the workpiece, so the spindle power is large, and the spindle power of the medium-sized mold milling machine and machining center is often 10~40kW, and some even higher.

(3) Multi-axis linkage and good deep cavity comprehensive cutting capability The mold cavity is composed of complex space 6 curved surface and groove, and many molds have deep cavity. In order to achieve high precision, high speed and high stability processing of 3D surfaces, the machine tool needs multi-axis linkage and has a good deep hole cavity comprehensive cutting capability. A five-axis linkage machining center can be used, in addition to the linear motion of three coordinates, there are two feed motions of the rotation coordinates. The milling head or table can be used for multi-axis linkage for continuous rotary feed, which is suitable for machining mold parts with complex cavity surfaces.

Composite machining is one of the development directions of mold processing. Although the machining center has been able to combine many machining processes on one machine tool, it still cannot fully adapt to the mold processing, and combines machining with electrical, chemical, ultrasonic and other different principle processing methods, and has more than two process characteristics. The composite processing will have broad prospects in the future mold manufacturing.

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