Precise Distribution Design And Parameter Optimization Of Micro-textured Ball-end Milling Cutter

Aiming at the problems of low processing efficiency,poor surface quality and short cutter life in milling titanium alloy,the micro textures are inserted into the cutter to prepare the micro textures with a certain arrangement on the surface between the cutter and the workpiece,which can effectively improve the friction performance of the friction pair surface and thus improve the cutting performance.Taking milling titanium alloy with micro-textured ball-end milling cutter as an entry point,this thesis studied the preparation technology of the laser,designed the distribution form of micro textures,analyzed the cutting performance of micro-textured cutters with different cutting edges,optimized the design parameters of micro textures of ball-end milling cutters with different cutting edges based on support vector regression machine,and completed precise distribution design and efficient preparation of micro-textured ball-end milling cutter.The high efficiency and quality processing of titanium alloy would be realized.The main contents of this thesis are as follows:Firstly,through the simulation analysis of the contact stress between cemented carbide and titanium alloy during grinding,the micro-texture structure was selected as micro-pit.The preparation test of micro textures and the simulation analysis of the physical field around micro textures were carried out,and the optimum parameters of laser preparation are 70% laser power,scanning speed 1700 mm/s and 7 times of scanning.the friction and wear test platform was established,and the anti-friction and anti-wear mechanism of micro-textured cutter was analyzed.Based on the above mechanism,the influence of the area occupancy of the rake face on the milling force was analyzed,which laid a foundation for the preparation of micro textures.Secondly,design model of the micro-texture parametric was used to analyze the cutter-chip contact area of micro-textured carbide milling cutter under milling conditions,and the micro-textured distribution form is preliminarily determined.The influence of cutting depth on the distribution form of micro textures was analyzed,and the distribution form of micro textures in the cutter-chip contact area considering different cutting depth was obtained.The influence of the distribution form of micro textures on the insert strength was analyzed by finite element simulation,which provided a guarantee for the research of cutting performance of micro-textured ball-end milling cutter.Thirdly,the finite element analysis model of micro-textured ball-end milling cutter milling with different cutting edge forms was established,and the positive role of inserting the cutting edge in effectively improving the cutting performance of the cutter was analyzed.Through simulation analysis,the influence of micro-textured parameters and cutting edge parameters on the cutting performance was studied.An experimental platform for milling titanium alloy with micro-textured ball-end milling cutter was established,and microtextured parameters are compared and analyzed.Based on the milling force experiment,the area proportion of non-textured cutter and micro-textured cutter in the cutter-chip contact area was analyzed and compared,and the optimum area proportion of micro-texture in the cutter-chip contact area of ball-end milling cutter with different cutting edge forms was obtained,which ranged from 7% to 14% and from 9% to 11%.The structural distribution forms provide constraints for subsequent research.Finally,based on the support vector regression model,the micro-textured design parameters of ball-end milling cutters with different cutting edges are optimized.Based on the milling experiment of titanium alloy,the life of the optimized micro-textured ball-end milling cutter with different cutting edge forms and the surface quality of the workpiece were verified and analyzed.It is concluded that the wear area of micro-texture ball-end milling cutter with blunt edge and the one with negative chamfer edge is much smaller than that before optimization,which can prove that micro textures can play an effective role in the milling process.A prediction model of micro-texture diameter was established,which takes laser fabrication parameters as dependent variables.The accuracy of the model was verified,and the application scope of the relationship model between micro-textured parameters was determined.The research not only improves the fabrication efficiency of micro textures,but also greatly improves the cutting performance of cutters.