The Optimization Research Of Thin-walled Workpiece Of 45Cr Hardened Steel In Turning Process

Thin-walled workpieces of 45Cr hardened steel are selected as the study object and the problems about the process quality and efficiency of these workpieces are the primary study subject. The aim of research is improving its processing technology, selecting a suitable cutting tool and optimal cutting parameters , increasing productivity and reducing production costs which are achieved by the experimental researchs of turning process, theoretical analysis and turning process of FEM.This paper study says:(1) The cutting performance of cermets tools are studied. The content includes: based on the processing characteristics, several new types of cermets tools are chosed by analysing the material properties of 45Cr hardened steel, and the cutting performance is studied; the cutting force and wear mechanisms of cermets tools, the influence of the chip breaking groove types on the cutting performance and the workpieces quality are developed by doing the single factor experiments of cutting force and tool wear experiment about the thin-walled workpieces; the suitable cermets tool is eventually elected for 45Cr hardened steel workpieces, the cutting force model of cermets tool are found and the appropriate chip breaking groove is elected. This research results can provide a theoretical basis for the selection of a suitable cutting tools.(2) The optimization parameters of the turning process about thin-walled workpieces of 45Cr hardened steel are studied. The optimal cutting parameters are obtained by the taguchi method, the principal component analysis and the response surface methodology, and the optimum objective are cutting force, cutting power, surface roughness and material removal rate, and then the purpose of improving the thin-walled workpieces of the processing quality, reducing production costs and increasing tool life are confirmed through the optimal cutting parameters of the tests.(3) Cutting process of FEM is simulated. A cutting model of the thin-walled workpieces is established by Ansys9.0, the simulation of deformation and stress distribution abou the workpieces under the conditions of clamping, semi-finished process and finished process are achieved. The thermal deformation of the cutting area is simulated, and the contrast result of the wokpieces simulation by using the original fixture and the improved fixture are showed, which is helpful for the in-depth study of the finite element simulation of optimization methods in processing technology.