The Design And Analysis Of C Axis Feed Index Device Of High Precision Heavy NC Machine Tool

C-axis, that is the gyro shaft around the main axis (Z axis), and other feed-axis carried on interpolation, the spindle can achieve precise positioning,complete the special path's processing in vehicle mill machining center.In a fixture, The machine tool that has the C axis interpolation function can achieve more processes, composite processing, and greatly enhance the scope of its technology and improve the processing of large complex parts of precision.The Heavy and high-precision CNC machine tools is the required processing equipment to achieve large-scale precision parts and components, The design of C-axis feed system of machine tool is the key technology to improve the precise positioning of the spindle. At the same time, The feed device of ceaseless,the highly transmission rigidity,the good damping characteristic,the highly transmission efficiency is the essential condition of C-axis feed system of CNC machining center.This article reviewed the C axis index feed system's development and application, summarized the domestic and foreign developmental condition of C axis index feed system, researched on the principle of the Siemens 840D NC system control double servo motor-driven double-gear eliminates backlash and double lead worm Gear to eliminates the transmission gap, Initially designed C-axis feed index device of the heavy high-precision CNC machine tool, and has carried on the finite element analysis and the optimization design.finally, completed the comprehensive analysis of the spindle,the contrastive analysis and algorithm confirmation.This article carries on the Initial design,the finite element coordination simulation analysis and the optimized design based on the Siemens 840D NC system's preload function, the finite element analysis of static and the modal combined with the theories of optimization design.The results show that the presented method of design and analysis of the C-axis feed index device of the heavy high-precision CNC machine tool can satisfy the requirements of achieving the high-precision positioning of the spindle, its methodology can be applied to the Engineering problem's analysis and design.