Theoretical And Numerical Simulation Research On Stress And Efficiency Of Abrasive Slurry Jet Cutting Titanium Alloy

Titanium alloy is an important metal widely used in industry.Its position in industry determines its important research value.The traditional mechanical processing of titanium alloy is gradually difficult to guarantee the high precision and high-performance indicators required by industrial processing at the present stage.Abrasive slurry jet(ASJ)has advantages of superior processing accuracy and no heat-affected zone.So,it has great prospects for processing titanium alloy.The immaturity of theoretical research on ASJ cutting metals brings difficulties to the selection of processing parameters of titanium alloy.The micro-process of ASJ cutting titanium alloy is an important breakthrough in the study of cutting mechanism.The distribution of stress on cutting surface and cutting efficiency are important parameters affecting the processing quality.Based on inelastic collision theory and Hertz theorem,combined with theoretical analysis and numerical simulation,the mathematical model of ASJ cutting titanium alloy was established in this paper.The calculation formula and characteristics of stress distribution on surface were given.And the important factors affecting cutting efficiency and the emphasis of parameter selection were discussed.At the same time,the corresponding numerical model is established.And the numerical simulation results were compared and discussed with the discrete analysis of the theoretical model.It is found that the axial stress of abrasive particles impacting on the surface of titanium alloy is the key stress leading to the yield failure of titanium alloy,and the stress distribution on the surface of abrasive particles impacting on titanium alloy is that the center of indentation is circular and expands around.Under the parameters studied in this paper,the outlet pressure increases from 10 MPa to 16 MPa,the maximum axial stress increases by 107 MPa,and the maximum axial stress increases from 40 MPa to 46 MPa,the maximum axial stress increases by 46 MPa.When the abrasive mass fraction increases by 5%,the maximum stress decreases by about 11 MPa.The maximum stress decreases by about 1.2 MPa when the mass fraction of polymer increases by 2%.The cutting speed increases by 0.075 mm/s with an average increase of 5 MPa of outlet pressure.When the outlet pressure increases from 10 MPa to 16 MPa,the energy utilization ratio decreases from 137 MJ/mm~3 to 102 MJ/mm~3,which reduces35 MJ/mm~3.When the outlet pressure increases from 40 MPa to 46 MPa,the energy utilization ratio decreases from 56.1 MJ/mm~3 to 51.2 MJ/mm~3,which reduces 4.9MJ/mm~3.When the abrasive mass fraction is between 5%and 12%,the cutting speed increases from 0.1504 mm/s to 0.2024 mm/s,and reaches the highest value when the abrasive mass fraction is 12%.When the abrasive mass fraction increases from 12%to25%,the cutting speed decreases from 0.2024 mm/s to 0.1308 mm/s.When the abrasive mass fraction is between 5%and 10%,the energy utilization ratio increases from35.13MJ/mm~3 to 43.93 MJ/mm~3,and reaches the highest value when the abrasive mass fraction is 10%.When the abrasive mass fraction increases from 10%to 25%,the energy utilization ratio decreases from 43.93 MJ/mm~3 to 23.73 MJ/mm~3.When the outlet pressure is 20 MPa and the abrasive mass fraction is 15%,the cutting speed does not change with the change of abrasive particle size(200 mesh-60 mesh),and the value is stable at 0.326 mm/s.Based on theoretical analysis and numerical simulation,the mathematical model of ASJ cutting titanium alloy is established.It enriches the theoretical study of mechanism of ASJ cutting metal,and it also provides technical support for the application of ASJ in engineering field.It has strong theoretical and practical significance.