Research On WEDM Technology Of TC4 Titanium Alloy

TC4 titanium alloy has the advantages of low density,high specific strength,corrosion resistance,high temperature resistance and good compatibility(can be implanted in the human body).It is widely used in aerospace,chemical,automotive and medical fields and has attracted the attention of researchers.At the same time,TC4 titanium alloy also has the characteristics of lower thermal conductivity and smaller elastic modulus.If processed by traditional mechanical processing methods,it will cause severe wear,adhesion,and bonding wear of the tool,resulting in better processing quality.Difference.Therefore,traditional mechanical processing methods are difficult to process,so it is necessary to select appropriate processing methods to process them.The emergence of EDM methods provides the possibility for materials that are difficult to process.Because the electrode does not contact the workpiece and there is no macro force generated during processing,it has an irreplaceable role in various fields.This subject uses the wire EDM method to process TC4 titanium alloy.Through simulation analysis and experiments,the influence of various parameters on the process indicators is studied.The main research contents are as follows:(1)Analyze the basic theory of WEDM temperature field,determine the heat flux density of a single pulse discharge,the formula of the discharge channel radius and the electrode energy distribution coefficient.Using ANSYS software,a transient thermodynamic analysis of the pulse width and the number of power amplifier tubes was carried out.Through simulation,it was found that with the increase of the pulse width time and the discharge channel,the size of the galvanic pits continued to increase,resulting in poor surface quality of the workpiece.(2)Carry out the experiment through the single factor test method,reasonably select the pulse width,discharge gap,the number of power amplifier tubes and the frequency conversion value(wire speed)parameters,and analyze the law of the influence of each processing parameter on the process standard.Carry out the experiment through the single factor test method,analyze the influence law of pulse width,discharge gap,power amplifier tube number and frequency conversion value(wire speed)parameters on process indicators.It is found that as the pulse width increases,the cutting speed will increase,and the surface roughness value will also increase due to the increase of the discharge energy;with the continuous increase of the discharge gap,the cutting speed will continue to decrease but the decrease is small,and at the same time Due to the increase of the discharge gap,the processing instability will increase the surface roughness value;with the increase of the number of power tubes,the pulse energy increases,the cutting speed will continue to increase and then gradually become flat,and the surface roughness value will follow Increase,but excessive current may cause wire breakage;with the continuous increase of the frequency conversion value,the wire transport speed increases,and the cutting speed also increases.At the same time,the discharge speed of the electro-erosion products continues to increase,and the surface roughness value decreases accordingly.(3)Orthogonal test method is used to process the test results.Through range analysis,it is found that the primary and secondary order of material cutting speed is pulse width,power amplifier tube number,discharge gap,and frequency conversion value.The optimal combination of parameters is pulse width 40?s,Discharge gap 2?m,7 power amplifier tubes,and frequency conversion value 50Hz;the primary and secondary order of surface roughness from large to small is pulse width,discharge gap,frequency conversion value and power amplifier tube number.The optimal combination of parameters is pulse width 12?s,The discharge gap is 2?m,the number of power amplifier tubes is 9 and the frequency conversion value is 40Hz.Through the analysis of variance,it is found that the significant degree of material cutting(from large to small)is the pulse width,the number of power amplifier tubes,the discharge gap and the frequency conversion value;the significant degree of surface roughness(from large to small)is the pulse width and power amplifier tube Number,discharge gap and frequency conversion value.Figure [54] Table [19] Ref [74]...