High-speed and high-speed high-speed machining is the development direction, high-speed milling in the mold processing has shown great superiority. In order to meet the mold cavity surface processing, the radius of the tool should be less than the minimum radius of the cavity surface, in order to avoid the process of cutting tools and workpiece interference. As the tool diameter is small, so the spindle speed is very high, foreign high-speed machine tool spindle speed has reached 40,000 to 10 million r / min, rapid feed rate of up to 30,000 to 60,000 min. Cavity and mold parts of other parts of the rough, finishing often in the workpiece to complete a clamping, so the spindle power to medium, medium size milling machine and machining center spindle power is often 10 ~ 40kw, and some even higher.