Experimental Study On Cutting And Grinding Of Titanium Alloy Casing Riser

Titanium alloys with high specific strength,high temperature resistance,corrosion resistance and other characteristics have been widely used in aerospace,naval ships,energy and other fields,in which the proportion of titanium castings application accounts for more than 90%.In order to solve the problems of serious pollution,complex process,low processing efficiency and poor surface quality,the experiments of cutting and grinding titanium alloy with three different parameters of resin CBN thin-film grinding wheel are carried out in the processing center.The main contents are as follows:Firstly,by analyzing the process of cutting and grinding riser,the parameters affecting the surface quality of titanium alloy(grinding wheel linear speed,workpiece feed speed and workpiece size)are determined.To study the influence of these parameters on workpiece processing quality,an experimental platform for cutting and grinding titanium alloy workpiece is established,and corresponding tests are designed according to the physical quantities to be studied.Inspection plan.Secondly,the process of cutting and grinding titanium alloy with resin CBN thinsection grinding wheel is analyzed,and the maximum undistorted debris thickness is calculated.The contact arc length between thin-section grinding wheel and workpiece in different cutting processes(cut-in,transition and cut-out)is deduced.The theoretical mathematical model of grinding force for thin-section grinding wheel cutting and Grinding Titanium Alloy under adhesion condition is established,thus the cutting is revealed.Grinding mechanism in cutting grinding process.Thirdly,the influence of cutting parameters on the process parameters(grinding force,grinding power,grinding specific energy)in cutting and grinding process is studied by single factor experiments.The results show that SLA(grain Size 100 #,thickness 1 mm)grinding wheel can obtain smaller grinding force,grinding power and grinding specific energy.Orthogonal test results show that workpiece width has the greatest influence on grinding force.The validity and correctness of the mathematical model of grinding force are verified by comparing the grinding force formula with the experimental results.Finally,the influence of cutting parameters on workpiece surface quality was studied by single factor experiments.The SLA(grain Size 100,thickness 1 mm)grinding wheel of the three grinding wheels can obtain smaller roughness.The influence of cutting parameters on the depth of hardness layer is analyzed.The results show that there is a certain thickness of softening layer on the surface layer of workpiece.SLA grinding wheel(grain size 100,thickness 1 mm)can obtain a lower depth of hardness layer.The top edge of grinding wheel is mainly fragmentation wear,while the side is mainly adhesion wear.Based on the above research,a mathematical model of grinding force under adhesion condition is established,and the mechanism of cutting and grinding titanium alloy with resin CBN thin grinding wheel is revealed.The influence of cutting parameters on grinding process parameters and grinding surface quality is expounded.This research will lead the traditional titanium alloy casing processing to the direction of intelligent manufacturing,effectively improve the output of aero-engine,thus promoting the rapid development of China's aerospace industry.