| In recent years，turbochargers have increased in importance and have becomeindispensable to environmental protection and improved output, accompanied by furthertightening of emissions standards. The stainless steel turbo house has the difficultmachinablily characteristics of great toughness，high heat intensity，low heat conductioncoefficient and serious rigidification for machining and so on.This paper provides strong technical support for machiningautomotive turbocharger housing difficult-to-machine materials and promote ownbrand in the market share in industry. By improving critical technique process steps,cutting Experiment and finite element simulation, substantial theoretical supports areprovided. Based on the above analysis, on the basis of theoreticalstudies, experimental research and analysis, following works were carried out:First of all, the problems in key product processes, like drilling，tapping and millingwere analyzed. On the methods of reasoning cutting tool structures, fixture positioning,choices of cutting parameters and coolant, mass production can be achieved. Throughadding heat treatment to the process and the special elements to the material, themachinability of the material is proved. Through the above research, the key process forthe processing of stainless steel volute drilling, tapping and milling to conduct analysisand research； reasonable tool structure, processing fixture positioning, a reasonablechoice, the difficulty of machining can be decreased and efficiency can be improved.Chemical composition, mechanical properties and microstructure of the material werestudied through experiment. Tool life milling test was carried out with reasonable choiceof cutting tool and parameters. Tool life curve was obtained to instruct production.Finally, finite element analysis was carried out to analyze several aspects of stainlesssteel milling. By chip formation mechanism simulation, deformations wereobtained within the adiabatic shear band. Strain distributions of different areas wereobtained by stress field analysis. Temperature field analysis of the shear plane and shear zones were carried out to understand the heat conduction characteristics. To laythe foundation for further deepen the study of the product. |
