Research On Profile Design And Manufacturing Of Gear Skiving In Spur Internal Gear Maching

With the progress of machining technology and the improvement of the precision requirement of gear workpiece,the traditional machining method can not meet the precision requirement of gears,and gear skiving has gradually become a mainstream gear machining method in recent years.As a new processing technology,different from gear shaping,gear hobbing,tooth drawing and other traditional gear processing methods,the greatest advantage of gear skiving is high processing efficiency,high flexibility,high workpiece accuracy and high tool life,so gear skiving has been concerned by the industry,especially for the processing of internal gear.The design of gear skiving tool is the key technology of gear machining,theoretical research is carried out on the velocity variation of gear skiving,the envelope forming of spur internal gear profile,the selection of gear skiving tool profile variation coefficient and the surface modification of gear skiving profile in the process of gear machining,in order to improve the accuracy of spur internal gear tooth profile.The specific contents are as follows:Firstly,based on the principle of internal gear tooth machining,the mathematical model of internal gear tooth machining process is established.From the perspective of kinematics,the relationship between different speeds at the engagement point is analyzed.Through the method of conjugate engagement and the machining process of the gear skiving,the tooth shape of the spur internal gear is simulated during the processing of the envelope exit tooth,which provides the theoretical basis for the design of the gear skiving tool structure.Secondly,based on the meshing point of the gear meshing when the gear skiving machining spur internal gear and the manufacturing point of the gear blade grinding,the influencing factors of gear skiving tool displacement coefficient are analyzed,and the range of the displacement coefficient under different parameters is derived.The times of envelope,accuracy of tooth profile and grinding principle are combined in the relationship,and the optimum displacement coefficient of gear skiving tool is determined.Starting from the machining process of spur internal gear,the influencing factors of tooth profile deviation and the methods to improve the spur internal gear tooth profile’s accuracy are analyzed under the case of axial angle error,which provided the basis for the parameter selection of the gear skiving tool structure design and the simulation machining of gear process.Thirdly,in order to improve the tool strength and precision of gear tooth surface,the tool tooth surface is modified by combining different modifying methods.The transmission error of the meshing tooth surface between the gear cutter and the inner gear tooth surface,the load size and distribution of the gear surface are compared and analyzed before and after the gear cutter modification,and the optimal gear surface modification scheme for the gear cutter is obtained.Finally,the gear skiving tool tooth surface parameters and the modification scheme are obtained from analysis,the three-dimensional model of the spur internal gear and the gear skiving tool before and after the modification are imported into the software of Vericut,the gear machine is built to simulate the machining process when turning the internal gear,and the precision of the spur internal gear profile before and after the tool modification are compared and analyzed.After processing out of the physical gear skiving tool,the spur internal gear profile detection after the physical gear skiving machining the spur internal gear is completed,and the effectiveness of the scheme of gear skiving tool is verified.