Design And Research On Turning Tool Combine Elliptical Vibration Cutting With Cutting Force Measurement

With the development of national precision manufacturing technology,both military and civilian use have continuously improved the quality requirements of products,and precision machining has become more and more important.Cutting tools,as the "teeth" of manufacturing,are the keys in the material removal process and have an irreplaceable role.However,diamond cutting tools which produced in recent years only have a single function.And it is difficult to process ferrous materials,which is increasingly unable to meet the needs of precision manufacturing.Therefore,this project aims at the limitations of diamond cutting tools.Using theoretical modeling,finite element simulation optimization,and actual tool characteristics testing,to design and develop an intelligent tool system that integrates ultrasonic vibration cutting and cutting force detection.Based on the ultrasonic vibration model,the time-varying parameters of vibration cutting are studied,and the cutting force model established based on the transient shear angle.Through the finite element cutting simulation,the variation of cutting force in ultrasonic vibration is studied,and the advantages of ultrasonic vibration cutting are determined,which lays a theoretical foundation for the design of integrated tool system.According to the piezoelectric transducer theory and the Theory of Timoshenko Beam,a three-order bending resonance with two-dimensional ultrasonic vibration tool is designed.The fixing method of the tool optimized by the finite element simulation of the tool vibrator.The rationality of tool structure parameters optimized by finite element mode,harmonic response and piezoelectric coupling simulation.Through the characteristic test of the tool,the response of the frequency,displacement and voltage of the vibrating tool is studied,and the input condition of the tool selected more reasonably.The design principle of the integrated force measurement system is proposed.The stiffness model of the sensing segment established based on the second theorem of Cartesian and the flexibility matrix method,and the influence of the structural parameters of the measurement system on the stiffness and sensitivity is studied.According to the piezoelectric effect and the mechanics principle,the mapping relationship between the induced charge and the input force explored.The cutting force acquisition platform is built based on Labview.Through the static and dynamic calibration of the force-aware structure,the real-time force measurement function of the system is realized.Finally,the rationality of structural design is verified by force measurement.The reliability of the machining was verified by the stiffness test of the tool system.Through the measurement of the vibration force signal,the error interference of the force measurement part is studied.Finally,the influence of the designed integrated tool system on the surface roughness,cutting force signal and tool wear of the workpiece is studied by using the face turning TC4 experiment,and the practicability of the tool system was verified.