Research On Cutting Performance Of Stainless Steel Based On Double Excitation Ultrasonic Elliptical Vibration

As a martensitic stainless steel,630 stainless steel has good comprehensive properties such as toughness,fatigue resistance and fracture toughness.It is currently a very good metal composite material and is widely used in the bearing industry,automobile industry,engine industry as well as the large-scale equipment of the hydropower station.At the same time,due to its good stress corrosion resistance,it is very suitable for field production in agricultural production and the loading of irrigation medicines.However,it also has many thorny problems in processing,such as:producing built-up edge easily,severe processing deformation and fast tool wear,etc.These problems seriously restrict the production and application of 630 stainless steel.Ultrasonic vibration cutting,as a new special processing method,can greatly reduce the cutting force and cutting temperature during the processing,and at the same time improve the service life of the tool and the processing quality of the workpiece surface.Therefore,in order to solve the difficulties in the processing of 630 stainless steel,we used a combination of numerical calculation and finite element analysis to design a 28kHz double-excitation elliptical vibration cutting device,and established the cutting force and cutting temperature of 630 stainless steel during ultrasonic elliptical vibration cutting Regression model.According to the model,we used cutting force and cutting temperature as evaluation indicators,630 stainless steel machining parameter optimization selection was studied,and experiments were designed to compare and verify.The main research work of this article is as follows:1.First,the characteristics of ultrasonic waves were introduced by studying the relationship between ultrasonic waves and temperature,propagation medium,etc.Then,by decomposing the periodic process of ultrasonic elliptical vibration cutting,the characteristics of changing speed of cutting tools,the separation of tools,friction reversal and changing angle of the cutting tools during the cutting process were studied;2.Via the combination of numerical calculation and finite element analysis,the ABAQUS software was firstly used to design the 28kHz horns in the X and Y directions.Then the software was used to perform modal analysis and harmonious response analysis on the designed horn too verify the strength of the horn and solve the amplification factor and other parameters.Finally,the impedance characteristics of the designed horn were tested to verify that the horn meets the design and use requirements and measured the amplitude of the horn;3.According to the performance of 630 stainless steel,firstly,the appropriate tool materials and tool parameters were selected.Then the response surface method was introduced,and the parameter levels(cutting speed,feed rate and back-eating amount)of finite element simulation analysis were designed by Design-Expert software combined with face-centered cubic design method(CCF).AdvantEdge finite element analysis software was used to perform the simulation analysis of vibration cutting of 630 stainless steel.Finally based on the results of the simulation analysis,a quadratic regression modeling was performed on cutting force and cutting temperature,and the accuracy of the model was evaluated and the influence law of three factors on the cutting force and cutting temperature during the cutting process was analyzed;4.Design-Expert software was used to optimize the experimental parameters according to the regression model.According to the parameter range of the optimization plan,pre-experiments were carried out to verify the accuracy of the regression model,and the design of the double-excitation elliptical vibration cutting device was used to verify the optimization plan.Finally the experimental results were compared with the results of the optimization scheme.And by comparison,the optimal machining parameters of 630 stainless steel vibration cutting were obtained,and the accuracy of model regression was evaluated again.The reasons for the error between the experimental results and the finite element simulation analysis results are that the vibration of the experimental equipment were not involved in the simulation analysis,tool wear,the model establishment errors existed,and the errors in the test process.