Austrian Cycloid Bevel Gears and hypoid gear pairs are generally processed by the tool inclination full generation method; When the transmission ratio i12 ≥ 3 or the cone angle of the big wheel δ When 2 ≥ 60 °, the gear tooth profile is close to a straight line, and the tool inclination half generation method can be used for machining. In the process of tool tilting half generating method, the large wheel is processed by continuous indexing and non generating cutting, and the small wheel is processed by dual generating method. In order to improve the production efficiency of large wheels.
During the design and calculation, first determine the cutting parameters according to the formulas and charts provided by the gear milling machine manufacturer, and then confirm whether the parameters are reasonable through the tooth surface contact analysis. Generally, the following steps are required from design to processing:
(1) Know the parameters related to the product structure and transmission performance, and preliminarily calculate or select the main parameters of the gear according to the empirical formula, line diagram and empirical data recommended by Austrian system;
(2) Strength check. If it does not meet the requirements, adjust the strength check parameters, or adjust the gear design parameters. Repeat step (1), recalculate or select the main parameters of the gear;
(3) Draw gear processing parts drawing;
(4) Carry out gear cutting adjustment calculation to obtain the basic processing parameters required for processing;
(5) Conduct tooth contact analysis;
(6) If the contact area or transmission error does not meet the design requirements, repeat steps (4) to (6);
(7) Output gear cutting adjustment parameters;
(8) Install cutting tools and workpieces and conduct trial cutting;
(9) Measure the processed gear;
(10) If it does not meet the design requirements, repeat steps (4) to (9) until qualified products are processed.
Among them, the problems existing in the design and manufacture of Cycloid Bevel Gears and hypoid gears by the inclined half generation method are:
(1) The calculation is complicated. According to the results of tooth contact analysis, it is necessary to repeatedly adjust and calculate the cutting parameters, such as cutter inclination. When the instantaneous contact ellipse and contact area length coefficient CT cannot meet the requirements, it is necessary to repeatedly adjust the tool inclination;
(2) The tooth cutting adjustment calculation is difficult to put forward specific requirements for the shape of the contact trace, and the meshing characteristics of both sides of the tooth are greatly different;
(3) The design and manufacture of Cycloid Bevel Gears and hypoid gears are limited by special machine tools.
Therefore, this paper studies the machining principle of Cycloid Bevel Gear and hypoid gear cutter inclination semi generation method, hopes to put forward requirements for calculating high-order variables at the reference point to control the meshing characteristics of the tooth surface based on the gear meshing principle, and puts forward a manufacturing method with higher machining efficiency.