Research On The Influence Of Machining Parameters On Surface Morphology And Contact Characteristics Parameters

With the precision requirements of mechanical equipment continue to increase,the requirements for the research and design of the static stiffness,dynamic stiffness,and damping performance of the entire mechanical equipment also increase.The static and dynamic contact stiffness and damping of the mechanical joint surface are not only the basic parameters that reflect the contact characteristics of the mechanical joint surface,but also the key parameters that determine the static and dynamic performance of the whole machine.Because in the analysis of the contact surface stiffness and damping,the three micro-convex characterization parameters of the micro-convex body radius,density and root mean square roughness in the machined surface morphology need to be used,and the three micro-convex body characterization parameters There is also a certain relationship with the processing method and processing parameters(amounts of cutting and grinding);therefore,analyzing the influence of the processing parameters on the characterization parameters of the three microconvex bodies can indirectly reveal the different cutting amounts on the bonding surface.The impact of dynamic contact stiffness and damping can further reverse design the machining methods and cutting parameters from the perspective of improving the static and dynamic performance of the machine equipment.Therefore,in this paper,from the establishment of a simulation model of the surface morphology that forms the joint surface,the three microconvex characterization parameters in the simulated surface morphology are extracted,and the theoretical prediction models of the three microconvex characterization and processing parameters are established to study.Analyze the influence of processing parameters on the contact stiffness and damping of the joint surface,and then provide theoretical basis and technical solutions for improving the static and dynamic performance of the mechanical equipment.1.Build a simulation model of typical machined surface topography.Establish a theoretical simulation model of the surface morphology of the turning and grinding workpieces considering the comprehensive influence of processing parameters,self-excited vibration and random influence factors.Use Matlab software to simulate the surface morphology of the workpiece turning and grinding under different processing parameters and vibrations,and analyze the simulation results of the surface morphology of the workpiece turned by the experiment:under the same processing parameters,the model simulation and the experimental sample In the morphology,the relative error of the average height of the micro-convex body is between 9%and 24.9%,and the relative error of the root mean square value of the micro-convex body fluctuates around 26.11%.The simulation model can better simulate the actual surface morphology of the turned workpiece,and theoretically truly reflect the regularity of the influence of additional parameters on the surface morphology of the turned workpiece.2.Extraction of characterization parameters related to the contact characteristics of the processed surface.Based on higher-order moment spectrum analysis and using the Maltab software,the radius,density and root mean square value of the micro-convex bodies were successfully extracted from the simulated surface morphology.At the same time,using Eviews software to establish three linear regression prediction equations of three microconvex characterization parameters and cutting(grinding)dosage.After experimental comparison,it was found that the prediction accuracy of the regression model reached more than 74%,and the three micro-convex characterization parameters in the corresponding surface were directly calculated through the processing parameters.In order to analyze the contact stiffness and damping of the bonding surface by different processing parameters Lay the foundation.3.The influence of processing parameters on the static and dynamic contact stiffness and damping of the joint surface.By citing previous scholars’ assumption of equivalent single-plane based on rough surface,the calculation model of static and dynamic contact characteristic parameters of the normal load of the joint surface without considering the interaction is established.Analyze the influence of different processing parameters on the static contact load and stiffness,contact load and dynamic contact stiffness,and contact load and damping of the normal loaded joint surface from a theoretical perspective,and compare the measurement results of the joint surface contact stiffness and damping experimental measurement system with The results of the theoretical analysis are compared,and it is found that the different processing parameters measured in the experiment have the same effect on the contact load and static contact stiffness,contact load and dynamic contact stiffness,and damping of the interface.