In the mechanical transmission industry, gear is an important basic transmission component. Gear transmission has many advantages, such as stable transmission ratio, high transmission power, compact and reliable structure, long service life of gear transmission and so on. It is widely used in various mechanical equipment and instruments, and is suitable for various complex working environments. Equal height gear is a necessary basic component to realize the transmission of two intersecting shafts and intersecting shafts in transmission equipment. It has the unique advantages of stable high-speed transmission, strong bearing capacity and low transmission noise. Therefore, contour gears are increasingly used in aerospace, construction machinery, transportation and other industries.
With the importance of spiral bevel gears in various mechanical transmission fields, many gear companies around the world design and manufacture spiral bevel gears. Gleason company used to produce spiral bevel gears with shrink teeth, and later it was mainly used to design and produce spiral bevel gears with equal high teeth; Klinberg and eurekon mainly focus on the R & D and production of equal height teeth. At the initial stage of the development of spiral bevel gears, shrink teeth have been widely used in China, mainly because the contact area of shrink teeth is small, which can meet the requirements of contact area and noise under the condition of large machining and assembly errors. However, with the introduction of foreign advanced technology, more advantages of equal height teeth are found: due to the use of continuous indexing cutting method to process equal height spiral bevel gears, the whole process processing with higher production efficiency can be realized; In the process of gear meshing, the noise can be reduced and the transmission can be more stable. Therefore, equal height gear has attracted more and more attention, and has attracted much attention in the transportation industry such as automobile.
In 2007, American axle company completely eliminated tapered teeth and adopted equal height teeth; Rockwell, the largest axle company in the United States, has also used contour teeth in its new plant; Ford, GM, Toyota, Honda and other famous automobile companies have also begun to turn to equal high gear processing; Gleason company, which uses the end face milling method to process bevel gears, also began to develop the end face hobbing technology. Therefore, there will be two coexisting situations in the future, and the market share of equal height gears will increase. The processing technology of equal high gear in China started late and the technology is not perfect. The use of production equipment and tools depends more on foreign gear suppliers, resulting in relatively high cost of equal high gear. Because the machining and adjustment of equal height spiral bevel gear are very complex, at the same time, the deformation of machining tools, large assembly error and the setting of machine tool parameters will affect the accuracy of machining gear, so it is not easy to obtain high-quality machining surface. Therefore, the analysis of the machining principle of equal height spiral bevel gear, the simulation of its machining process and the optimization of cutting parameters are of great practical significance to improve the gear machining accuracy and machining surface.
According to the meshing principle of equal height spiral bevel gear and combined with the integrated cutter bar with sharp tooth cutter head, the machining principle of equal height spiral bevel gear is studied, the parameters of important parameters of milling cutter and the structure of milling cutter head are analyzed, the simulation of equal height spiral bevel gear machining is realized, the influence of cutting parameters on the machining process is analyzed, and the cutting parameter optimization based on genetic algorithm is carried out, The optimized cutting parameters are verified by experiments. On this basis, the surface accuracy of equal height spiral bevel gear is improved, which has a certain reference value.