The design of spiral bevel gear includes the determination of basic parameters of gear pair, the selection of tooth cutting mode and midpoint curvature, tooth shrinkage mode, tooth design and undercutting experiment. Taking machining as an example, in the cutting adjustment technology of spiral bevel gear, Gleason technology is further improved based on the meshing theory of “local synthesis method” proposed by Professor Litvin. In the aspect of pre controlling the shape of contact area, the third-order contact analysis method of spiral bevel gear meshing can be used.
According to the modern optimization method, multiple points are selected on the whole tooth surface for synchronous optimization. Based on the local synthesis method, tooth contact analysis (TCA) and tooth load contact analysis (LTCA), a closed feedback optimization design system based on the design and machining parameters is formed. In the design method of spiral bevel gear, the local synthesis method is combined with TCA technology to realize the pre control of gear contact area and improve the transmission performance of gear. At present, the research results in this field are widely used in the design, manufacture and measurement of spiral bevel gears.
The traditional processing of spiral bevel gear mostly adopts spiral bevel gear milling machine. Taking the fixed installation as an example, the large wheel is processed by double-sided method and the small wheel is processed by single-sided method, and then the rolling inspection is carried out on the rolling inspection machine. By continuing to process the tooth surface of the small wheel and adjusting the contact area, it generally needs many adjustments to mesh correctly. The process is cumbersome. In the service environment with low requirements, The shape and position of the contact area need not be too strict. When the requirements are high, it needs to be adjusted many times to make the correct contact area between the large and small wheels without edge contact.
The spiral bevel gear pair processed by tooth milling can trim the bad contact area by cutting the tooth surface, and has strong operability. For small batch processing, the efficiency is high, but for large batch processing, the reduction of single piece processing time is not obvious and the efficiency is low.
In addition, in the process of tooth milling, the cutter cuts off the metal fiber structure, which reduces the strength of the teeth and other parts of the spiral bevel gear. In order to meet the requirements, it is necessary to increase the overall size of the spiral bevel gear, which increases the production cost and the size of the formed parts, and limits its application range to a certain extent.