Large Gantry Machine Tool Automatic Tool Changer

Automatic tool changer is an important auxiliary processing device on machine tool, whose internal high-speed development and application of functional components dramatically improve the production efficiency. In the cutting, the short cutting time and high cutting speed are requested, and gradually the requirement of the exchange tool time is rised, the speed of exchange tool are becoming high levels of representative indicator in the contemporary machining center. Each processing center are making their focus on the automatic tool change technology for competition. Automatic tool changer of gantry machine are summarized, and the configuration with tool changer manipulator and tool container are introduced. It provides a hardware foundation for the study.The article on the basis of investigation on the development and research status of domestic and foreign automatic tool change technology, research linkage shank of using on the high-speed machining, comprehensive analyzing the application scope of selected HSK shank's various sizes and machine tool equipment with parameters to select high shank. According to international standard, HSK shank model and HSK tool system model are established, and work principle of HSK tool system is analyzed.Through analyzing shank/spindle linkage/coupling performance and studying the various parameters on the performance of the coupling taper surface, it can obtain that each parameter has how effect on coupling. Based on the cone coupling's reliable conditions, it is concluded that the standard shank can't satisfy the coupling performance requirements. Improved structure is analyzed about cone coupling performance. If optimized structure meets performance, dynamic balance will be sensed. If dynamic unbalance of the structure exists, it requires the balance hole to compensate equilibrium requirements.By analyzing the joining reliability of the shank and spindle relationship between speed and reliability, simultaneously the margin of safety judgment is carried. The reliability of tool changing speed-curve is established. One cutter replacement rate weighs through cutter replacement time measurement and the reliability weighs by the margin of safety. Through the analysis of the cutter replacement speed and cost relationship, a tool change speed-cost curve is established.