Research Of Contact Process For Cutting Titanium Alloy Tool Based On Mesoscopic Scale

Those the characteristics of the cemented carbide cutting tool and workpiece material itself, processing parameters and external factors always lead the friction and wear phenomenon in the machining process of workpiece materials. From mesoscopic scale, friction and wear are actually the sliding compression process of many asperities which are distributed in two contact surfaces. Based on the elastic and elastic-plastic spherical contact theory, this paper mainly studies the sliding compression process of asperities between the contact surfaces in the machining process from mesoscopic scale. The mesoscopic scale contact model was established by finite element simulation software, the stress distribution rule and size changing between the sliding contact surfaces of a couple of asperities in different analysis parameters was studied. This paper researches the project from following aspects:First of all, TR200 surface roughness measuring instrument was used to measure the flank surface morphology of the cemented carbide cutting tool and collect data parameters which represented the surface roughness. The surface morphology was roughness which was verified through the experiment and the radius size scope of asperity was acquired by relationship of the surface roughness parameters. Reference data were provided to simulate the finite element model.Secondly, the finite element software ABAQUS was used to build contact model of asperities and comprehensive experiment design method was used to arrange the experiments. The paper mainly studies the horizontal sliding contact process and the static compression contact process. The research factors were dimensionless value of vertical interference, sliding velocity, radius of asperity and extrusion depth. The effects on the stress distribution rule and size changing of the cemented carbide asperity surface were studied. Regression model was analyzed by MATLAB, and the regression equation and the influence laws of various factors to the stress changes were acquired.Finally, the extrusion wear of the particle to the cemented carbide surface between the contact surfaces was studied. The particle was treated as a rigid body, and the cemented carbide surface residual stress and the force changes under the condition of different radii and extrusion depth were researched. The influence law of various factors on the surface wear was analysed, which made preparations for further researches on abrasive wear.