Analysis of the characteristics of high-speed processing machine tools in mold manufacturing

1. Large load-bearing and high rigidity

This is because the mold is developing in the direction of large-scale, the processing equipment must have a large enough table size and working stroke to adapt to it. Nowadays, molds of several tons to dozens of tons are very common, requiring the work surface of the machine tool to bear heavy weight. The strength and hardness of the mold material are very high, and the mold cavity is often processed with a small-diameter end mill with a large elongation, so chatter vibration is prone to occur during the processing process. In order to ensure the machining accuracy and surface quality of parts, high-speed machine tools used 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, and high-speed milling has shown great advantages in mold processing. In order to adapt to the processing of the mold cavity surface, the radius of the tool should be smaller than the minimum circumference radius of the cavity surface to avoid interference between the tool and the workpiece during the processing. Due to the small diameter of the tool, the spindle speed is required to be very high. The spindle speed of foreign high-speed machining machine tools has reached 40,000 to 100,000 r/min, and the rapid feed rate can reach 30,000 to 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 (Guide: Analysis of the influence factors of forming mold results on the production process)

Mold cavities are mostly composed of complicated spaces with 6 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 requires 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 be multi-axis linkage for continuous rotation feed, which is suitable for processing mold parts with complex cavity surfaces.

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