The Design Of Feed System Of Ultra-precision Grinding Machine Based On Virtual Prototyping Technology

The feed system is an important and infrastructural part of ultra-precision silicon grinding machine.The static,dynamic and thermal performances of feed system not only directly affect positioning accuracy and machining accuracy of the grinding machine,but also influence working capability of the ultra-precision grinding machine,The ultra-precision grinding machine, as a mechanical and electrical product with complicated structure and high automation, its design has the rigorous requirements on statics performance, dynamic performance, thermal performance and kinematic performance,so modern design methods must be taken to assure the design quality and the final performance of the product.Traditional products design and development procedure generally contains sketch design, drawing design, physical prototype manufacture and prototype experiment.This procedure makes long period and costs highly.Virtual prototype technology is a kind of new product design technology,which is widely used during recent years.Applying virtual prototype technology in the process of product design could reduce its development cost, cut the development cycle, improve the design quality and product performance and increase the competition capability of the enterprise.This paper researches on the feed system of ultra-precision grinding machine, establishes the 3D virtual numerical model by Pro/e, and also establishes the finite element model,kinematic simulation model based on the 3D numerical model. In this paper, the author analyses the statics,dynamic and thermal performances of feed system by Ansys,and gets the stiffness,stress,deformation,frequency,modal shape nephogram,dynamic response,thermal deformation and some other useful parameters of feed system,on the basis of these parameters,the paper finishes the optimization of the structure of feed system and the selection of design decisions,and also determines the number of teeth of grinding wheel and rotate speed of the electric spindle.In addition,it also finishes the kinematic simulation of the feed system by Adams.Friction and flexibility of ballscrew have been taken into concern in the simulation. By analyzing the velocity and acceleration curves of feed system,it is researched the influences on the positioning accuracy and machining accuracy by creeping.