| The core component of ultrasonic assisted cutting technology is ultrasonic cutting tools.Ultrasonic dagger tool,as a kind of symmetrical sheet tool,is mainly used for ultrasonic vibration assisted cutting of aramid honeycomb and other composite materials.This kind of tool needs to take into account the dual characteristics of traditional dagger tools and ultrasonic longitudinal vibration modes,so it has higher requirements for the grinding accuracy of such tools.At present,the research on the key technology of ultrasonic dagger tool grinding is relatively weak in China,and the existing ultrasonic dagger tool edge has the problem of stress concentration,so it is necessary to optimize the tool structure.In addition,the existing general-purpose CNC tool grinding machine is mainly for the grinding of standard tools such as drill bits,milling cutters,and taps.There is an urgent need to study the grinding and grinding programming of the unconventional blade surface of the ultrasonic dagger tool,especially the high-precision grinding of the curved blade surface of the new dagger tool.Therefore,this paper focuses on the key technologies of ultrasonic dagger blade shape optimization and grinding.The main research contents are as follows :(1)Geometric feature modeling and blade parameter optimization design of ultrasonic dagger tool.Based on the analysis of the structural characteristics of the cutting tool,a new structure of circular edge is proposed for the dagger cutting tool and the mathematical model of the edge line is established.With the help of Ansys finite element method,the influence characteristics of blade parameters on resonance frequency and amplitude magnification are analyzed.From the perspective of tool vibration performance,the arc blade parameters of the tool are optimized and obtained,which lays a theoretical foundation for the study of grinding trajectory of arc blade dagger tool.(2)The geometric characteristics of the tool edge line model of the arc-edged dagger are analyzed,and the grinding process is reasonably formulated.Based on the end-face grinding process method,the end-face grinding boundary method is proposed,and the grinding trajectory models of the tool end edge surface,arc edge surface,root edge surface and tool tip edge surface are established.With the help of Matlab,the implementation algorithm is developed to solve the center position and axis vector of the grinding wheel,and the grinding wheel trajectory is simulated and verified.(3)The post-processing algorithm is studied.Combined with the structural characteristics of the five-axis CNC tool grinder in the laboratory,the post-processing algorithm is derived based on the analysis of the kinematics of the machine tool,and the NC code generation program is developed to convert the grinding wheel trajectory into the motion of each axis of the machine tool.The twin grinding machine system is built on the VERICUT simulation platform to verify the grinding simulation of the arc blade dagger tool.(4)The experimental verification of the grinding trajectory and NC code of the arc-edged dagger tool.The grinding experiment of the arc-edged dagger tool was carried out on the five-axis CNC tool grinding machine in the laboratory.The MV-CE120-10 UC camera in-situ-detection vision system was used to detect the tool size parameters.The error between the design parameters,simulation data and measured parameters of the arc-edged dagger tool is within 1.33 %,which effectively verifies the correctness of the grinding trajectory model based on the end face grinding boundary method and the reliability of the post-processing algorithm in the actual processing of the customized tool grinding machine. |
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