Research On Gear Ring Clamping Deformation And Gear Shaper Cutter Geometric Parameters Optimization Based On Genetic Algorithm

As a kind of gear,thin-walled ring gear has the advantages of compact structure,high transmission efficiency and long service life.It is widely used in the planetary reducer structure of automobile,engineering machinery and other fields.However,due to the constraints of structural design and use space,the thickness of the ring gear is small and the rigidity is poor.During the processing of the ring gear,there are problems such as clamping deformation,excessive cutting force and temperature caused by the structural parameters of the gear shaper cutter,which affect the processing size and the accuracy of the ring gear.So in this paper,genetic algorithm is used to optimize the structure parameters,clamping force and geometric parameters of gear shaper in the process of gear ring clamping,so as to reduce the deformation of gear ring in the process of clamping and machining.Firstly,this paper introduces the structural characteristics and existing problems of thin-walled gear ring,expounds the research background and current situation of fixture clamping deformation,tool geometric parameters and optimization technology,puts forward corresponding solutions to the existing problems of gear ring,and introduces the software and solutions needed by the heritage algorithm and optimization technology used in this paper.Secondly,the mathematical model of the gear ring clamping scheme is established,and the deformation is obtained through the finite element simulation analysis.Through the analysis of the existing gear ring clamping structure,the original structure is changed,the improved structure parameters and clamping force are taken as variables,the maximum clamping deformation is taken as the objective function,and the multi Island genetic algorithm is used to optimize,and the optimized results are limited Meta simulation verification analysis.Then,according to the reason that the gear shape accuracy is not high due to the excessive cutting force and temperature in the process of gear shaping,and as one of the factors that affect the cutting force and temperature,the geometric parameters of gear shaping cutter can be optimized to reduce the cutting force and temperature and improve the accuracy of gear shape.Three dimensional model of gear shaper cutter and gear ring in UG,the three-dimensional model is introduced into HyperMesh to divide the mesh,and then introduced into ABAQUS to set up material constitutive model,cutting separation criteria,contact friction model,definition of unit type and boundary conditions,to carry out the simulation analysis of gear shaping process,and get the change of Cutting force and temperature.Analyze the change rule of cutting force in X,Y and Z directions,calculate the cutting force through ABAQUS data processing,and extract the cutting force as the objective function to optimize the geometric parameters of gear shaper cutter below,and extracts the maximum cutting temperature in the process of gear shaper machining as another objective function for optimizing the geometric parameters of the gear shaper cutter below.Finally,taking the front angle and back angle of the gear shaper cutter as the experimental factors,several sample points are obtained by optimizing the Latin hypercube experimental design,and the corresponding cutting force and cutting temperature are obtained by using the finite element simulation analysis.The response surface approximation model is used to fit the functional relationship between the front angle and back angle of the gear shaper cutter and the cutting force and cutting temperature respectively.In order to obtain the geometric parameters of the gear shaper cutter with the minimum cutting force and temperature,the established approximate model takes the front angle and back angle of the gear shaper cutter as variables and the minimum cutting force and temperature as objective functions.Through the optimization of the geometric parameters of the gear shaper cutter,the cutting force is reduced from 11269.7N to 7306.58 N,which is 35.17%,and the cutting temperature is reduced from 335.1? to 225.3?,which is 32.77%.The optimization effect is significant,which is of great significance to the study of the low accuracy of the ring gear profile caused by the excessive cutting force and cutting temperature.In order to optimize the geometric parameters of gear shaper cutter,the computer optimization platform and finite element simulation analysis are combined to establish approximate model instead of finite element simulation analysis,which effectively shortens the time of simulation analysis,improves the efficiency of cutter design,and has important reference significance for other cutter design.