Design Of Direct Drive Multiple Axes Rotary Spindle Head For Boring & Milling Machine

The main aim of modern process technology is high speed,high efficiency and high precision machining. For this demand, high speed machine tool components must be developed. The key of high-speed for machine tools is high-speed for the main spindle system and the feed system. And the most ideal approach of high-speed for the two systems is to reduce system links and adopt direct drive. The main spindle direct driven,i.e. electrical main spindle, has been applied to digital control machine tool at present. The research of the spindle head system directly driven by the torque motor for the high speed, high dynamic performance is in a starting stage. In accordance with this trend, the research around boring & milling head, which is one of critical components for high-speed numerical control machine tool, is under development. The goal is to get command of the behavior and the systematic design theory of applying torque motor at spindle head system, and to offer the foundation for extending and applying this system.At first, the developing trend of manufacturing industry, the main features of the high speed processing and the influence and main demands to the structure of five-axes NC machine tools are analyzed. The present situation of application and research for direct driving at high speed digital control at home and abroad are introduced. Afterwards, on this basis, the research background, the object and the meaning are explained. Subsequently, the characteristic of torque motor, the selection of the main components are discussed, and the machine structural design of direct driven universal boring & milling head has been completed. The resolvent of coupling problem among relative motion of machine, electricity and fluid is brought forward creatively. By building three-dimensional digital modeling of the boring & milling head, the static and dynamic interference states can be checked in the digitalmodel and design error can be cleared up. The mechanism motion simulation is carried out, and the mechanism operating principle is verified. To meet the demands of the high speed machining the static force analysis of the key components is carried out by the finite element method, the modal analysis of boring & milling head is carried out, and its structure and sizes are optimized according to the analyzing result. That establishes the foundation for obtaining favorable dynamic performance. Finally, a summary based on the research findings is given, and the thermal stress analysis and the needs of further pursuit forecast.