Research On Motion Of Four Trajectories Of Orbital Forging And Deformation Of Spiral Bevel Gears

Spiral bevel gears are widely applied in automobile,aerospace,shipbuilding and other machinery industries because of the advantages of smoothdrive,low noise and high carrying capacity,etc.With the rapid development of the machinery field,the traditional processing method for machining spiral bevel gears has been unable to meet the requirements of modern industrial development.Rotary forging spiral bevel gears is a new precision plastic forming technology,which has the advantages of labor saving,energy saving,materials saving and high precision,what’s more,it can also remarkable improve the comprehensive properties and service life of spiral bevel gears.The rotary forging of spiral bevel gears is a complex process,different trajectories will produce different forming effects,conventional analysis methods is difficult to describe the forming process of spiral bevel gears accurately,however,the finite element method can make the complex metal forming process becomes intuitive and concrete.Since the motion state of swing head has an important influence on the forming effect of gears,according to the displacement equation of the locus of swing head,the motion equation of locus has been established,on the basis of the motion equation,the influence of eccentricity of double eccentricity sleeves on the movements of swing head in rotary forging press has been researched.Based on the DEFORM-3D software,the finite element model of rotary forging of spiral bevel gears has been established by setting the relevant parameters,and the tooth filling,axial forging load,distribution and evolution of effective strain,damage factor,temperature,and metal flowing velocity are researched,which revealed the deformation law of spiral bevel gears under circular line,rose curve and spirals curve.Owing to the rotation speed of double eccentricity sleeves have great influence on the deformation of spiral bevel gears,the rotation speed of internal and external eccentricity sleeves are changed to be used for researching the influence of the period and shape of trajectory on deformation,and the deformation law of spiral bevel gears rotary forging by rose curve and spirals curve are revealed by studying the force parameters,contact area,distribution and evolution of effective strain,damage factor.The finite element model of spiral bevel gears rotary forging by rose curve and spirals curve has been established by studying the influence of eccentricity of double eccentricity sleeves on the trajectory.And the design method of internal and external eccentricity sleeves has been established by combining the simulation results and motion law.The design method provides a theoretical basis for structural design of rotary forging machine,and has great significance for the development and application of rotary forging machine.