Is the machining efficiency of high-speed machining centers high? In the past decade, due to the continuous progress of cutting tools, drives, control, and machine tools, high-speed machining and efficient machining, especially high-speed hard milling, have been widely applied and promoted in the mold manufacturing industry. Traditional electric discharge machining has been replaced by high-speed hard milling in many occasions. By using high-speed hard milling to comprehensively process the mold blank under one-time clamping, not only has the custom brass machining accuracy and surface quality of the mold been greatly improved, the processing time has been greatly reduced, but the production process has also been simplified, significantly shortening the manufacturing cycle of the mold and reducing the production cost of the mold.
The continuously improving working performance of high-speed machining centers is an important prerequisite for the mold manufacturing industry to efficiently and accurately process molds. Driven by drive technology, numerous different types of high-speed machining centers with innovative structures and excellent performance have emerged. The three axis high-speed machining center that emerged in the mid to late 1990s has now developed into a five axis high-speed machining center.
High speed machining center refers to a high spindle speed (usually above 15000rpm), fast moving speed (usually above 60m/min), and fast cutting speed (usually above 24m/min). This way, the machining efficiency is high, the smoothness is good, and the deformation of the workpiece is small due to the influence of cutting force. Suitable for cutting thin-walled parts, widely used in aerospace, military, medical equipment and other fields.
High speed spindle is one of the most critical components of high-speed machining centers. At present, machining centers with spindle speeds ranging from 20000 to 40000 r/min are becoming increasingly popular. Some high-speed machining centers in Europe have achieved spindle speeds of 60000 r/min, and ultra high-speed spindles with speeds of over 100000 r/min are also being developed. The speed, horsepower, dynamic balance, rigidity, taper hole shape, and thermal deformation characteristics of high-speed machining centers have a significant impact on the rigidity and thermal stability of high-speed machining centers. This requires the high-speed machining center spindle and motor to be combined into an electric spindle, achieving direct transmission without intermediate links, reducing transmission components, and having higher reliability.
In terms of driving methods, it has evolved from linear motion (X/Y/Z axis) servo motor and ball screw drive to the current linear motor drive. Rotary motion (A and C axes) adopts direct drive torque motor, while Shandong Weiwei Heavy Industry Machine Tool Co., Ltd. has developed the ptfe machining center into a five axis machining center using direct drive through linear motor and torque motor. Significantly improved the stroke speed, dynamic performance, and positioning accuracy of the machining center.