Prediction Of Welding Deformation Of Equal-high Spiral Bevel Gear Milling Cutter Head

Equal-high spiral bevel gear transmission system has the advantages of high stability,low noise and long service life.It is widely used in automobile,machine tool,construction machinery and other industries.As a machining tool of equal-high spiral bevel gear,the milling cutter head of equal-high spiral bevel gear has high precision requirements and is difficult to manufacture as a whole.In China,it is mostly divided into main body and outer ring,which are manufactured respectively,and then assembled and welded.Because the energy of welding heat source is relatively concentrated and the temperature field is unevenly distributed,it is very easy to produce deformation and affect the quality of milling cutter head.If the value and direction of the deformation of the milling cutter head can be obtained in advance,the deformation after welding will be offset and the accuracy of the milling cutter head will be greatly improved by adjusting the load of the fixture to the opposite position of the welding deformation.Therefore,the research on the deformation prediction of milling cutter head has important application value.In this paper,two welding simulation methods are used to predict the deformation of milling cutter head.The specific research contents are as follows:Firstly,the three-dimensional model of milling cutter head is established,and the appropriate heat source model is selected according to the actual welding situation.Based on the thermo-elastic-plastic theory,the temperature field of laser welding of milling cutter head is simulated and analyzed by Sysweld software,and whether the simulated weld pool size is consistent with the actual weld pool size is measured.Taking the simulated welding temperature field as the load,the residual stress and deformation of the milling cutter head are calculated,the stress nephogram and deformation nephogram at different times in the welding process of the milling cutter head are obtained,and the welding simulation results are analyzed.Secondly,find out the distribution of the inherent strain zone according to the shape of the weld pool after welding,calculate the inherent strain of the milling cutter head according to the actual welding parameters,load the inherent strain into the inherent strain zone by using the Weld planner software,and obtain the residual stress and deformation of the milling cutter head through one-time elastic calculation.The simulated welding results are compared with those obtained based on thermo-elastic-plastic theory.Finally,the welding experiment is carried out on the main body and outer ring of the milling cutter head,and whether the welding experiment is qualified is judged according to the surface quality of the weld.The electronic plug gauge is used to measure the cutter groove of the milling cutter head,and the measured cutter groove size is compared with the cutter groove size of the simulation results to test whether the two welding simulation methods can accurately predict the deformation of the milling cutter head,The advantages and disadvantages of the two simulation methods are analyzed.