Study On The Grinding Temperature Field And Thermal Stress For Difficult-to-machine Material Cr18Mn18N

The Cr18Mn18N austenite stainless steel has good toughness，inoxidizability，wearability，intensity high and other characteristics，it obtains many applications, suchas energy，chemical industry，building，medical service and other professions.According to the characteristics of the mechanical properties of austenitic stainlesssteels and its poorly processing performance，it belongs to difficult-to-machinematerials. The biggest grinding character of Cr18Mn18N austenite stainless steel arestrongly grinding force，highly grinding temperature，damagelessly processing surfaceand badly subsurface integrality. In order to improve the grinding characteristics andsubsurface integrity of Cr18Mn18N austenitic stainless steel， we conduct theexperiments combining3-D FEM simulation method，considering the grindingprocess of Cr18Mn18N austenitic stainless steel in this paper. The work that mainlycompletes includes:Firstly, we introduce some parameters of the theoretical modeling during thegrinding processing， and according to the character of Cr18Mn18N austeniticstainless steel，emphatically introduced it the grinding force model under adherencycondition；at the same time，the principle of moving heat source in ANSYS is alsopresented，these can provide the theoretical basis for the later analysis.Secondly, we introduce the plane grinding experiment of Cr18Mn18N austeniticstainless steel，including experimental specimens，experimental equipment andexperimental scheme，and then, analyses the experimental data. Then discuss thevariable relations of tangential grinding force and normal grinding force，and discoverthe certain linear relationship between them.Finally, we programming the plane grinding process of the Cr18Mn18Naustenite stainless steel by using APDL, the different heat source model and grindingconditions were simulated and analyzed by ANSYS. The simulation result showedthat maximum temperature appears on the surface，the temperature distribution curvesregular decreasing with the constant increase of the distance depth of workpiece，andfinally tends to be gentle；The different heat source model and the different grindingconditions have tiny effect to the simulation result；After grinding，the3-D FEMoccurred plastic deformation；And the forming of thermal stress on the surface of the3-D FEM is mainly affected by temperature factor. Therefore，reducing the grindingtemperature plays a very important role to improve the processing quality.