The Design And Performance Study On The High-speed Spindle/Handle Interface With Ceramic-Metal Composite Structural Spindle

High speed machining tool system is an important part of high speed machine tools,the performance of which directly affects the quality and efficiency of high speed machining. For centrifugal force role under high-speed, the radial expansion of traditional 7:24 spindle/handle interface and HSK spindle/handle interface will occur,cause a separation of the spindle and the handle with cone, reduce the coupling stiffness and reliability, and confine the enhancing of high-speed machining tool system limit speed. In order to solve this problem, this paper designed a new tool system with ceramic-metal composite structural spindle, in the perspective of changing the spindle taper hole structure and material. And the connection performance of it was analyzed by the theory and finite element analysis, specific content as follows:Determined the overall structure, connecting way of the ceramic-metal composite structural spindle-toolholder interface. And the structure, size and material of ceramic bushing was determined too. The relevant theories and simulate calculation has been carried on the design of structure, size and material of interface.Analyzed the deformation theory of the interface. Analyzed the main factors affecting the deformation of interface, and found out the design basis in theory in this paper; The connection reliability of the spindle/bushing were analyzed in theory, and got a conclusion that the structure formed by spindle and bushing could be as a composite spindle; Established the finite element model and used it to simulate the deformation of the interface and the connection reliability of spindle and bushing; The limit velocity of interface was analyzed in theory and finite element analysis.Analyzed the connection performance of the interface. Analyzed the roles to the interface contact stress of spindle speed, pre-tightening force and interface cone with surplus quantity. Meanwhile, the axial stiffness, torsional stiffness and radial stiffness were analyzed and the comparative analysis with conventional HSK spindle/handle interface was made.Studies show that the high-speed spindle/handle interface with ceramic-metal composite structural spindle designed in this paper performs better than the conventional HSK spindle/handle interface. Its limit velocity and contact stiffness are superior to the conventional HSK spindle/handle interface.