A Design Method of Tooth Profile Modification Curve for Tooth Surface Distortion Reduction

Abstract

The invention belongs to the field of gear design and relates to a method for designing an axial modification curve for reducing gear surface distortion. The method for designing the axial modification curve for reducing gear surface distortion solves the problem of gear surface distortion during grinding of a bevel gear subjected to axial modification. Different from a traditional modification curve, the modification curve designed through the method can effectively weaken distortion at the two ends of the gear. The method comprises the steps that the distortion quantity of the left gear surface and the right surface of the gear is calculated according to the gear grinding technique and based on a standard parabola modification curve, then the curve is divided into three sections, and the scaling factor of each curve section and the drum-shaped size of each portion are adjusted.

Description

technical field [0001] The invention belongs to the field of gear design, especially the design field of high-precision tooth direction modified helical gears. Tooth surface distortion problem. Background technique [0002] A large number of theories and practices have shown that tooth shape modification can reduce the impact of meshing and meshing in gear transmission, improve the uneven distribution of load along the tooth contact line, reduce vibration and dynamic load, and improve gear transmission accuracy and load bearing. capacity and service life. Sun Jianguo and others used ANSYS software to establish a finite element model of gear dynamic contact for analysis, and came to the conclusion that the impact of meshing and meshing was significantly improved after gear modification; Wei Yangang and others confirmed through simulation that tooth direction modification can effectively avoid edge effects and greatly Reduces maximum stress in gear transmissions. Gear modif...

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Problems solved by technology

Guo Erkuo et al. established a mathematical model for the modification error of the profile grinding tooth, and proposed a method of adjusting the installation angle of the grinding wheel to optimize the contact line to improve the tooth surface distortion, but this method is not suitable for worm grinding wheel grinding; Tran VT. et al. A method of adding an additional rotation angle of the gear to reduce the tooth distortion is proposed when grinding drum-shaped teeth. Although the effect is good, the requirements for the machine tool are extremely high

At present, foreign research focuses on several major gear grinding machine manufacturers, and twist control is achieved by trimming the worm with a specific shape or increasing the diagonal ratio during grinding. However, this method requires trimming on the entire length of the worm grinding wheel. Moreover, the full length of the worm grinding wheel is also required to participate in the grinding when grinding the teeth, resulting in high processing costs and low processing efficiency.

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