Tooth profile machining of spiral bevel gear

As the basic transmission parts of the machinery industry, more and more high-strength and multi-purpose gears and gear like products are being widely used, and the production methods are gradually becoming diversified. The processing technologies such as gear shaper, gear hobbing, gear planer and gear pulling are becoming more and more advanced, and the gear forging technology is becoming more and more mature. The method of trial manufacturing products by numerical simulation and forging experiment, It has made great contributions to improving plant R & D efficiency and reducing production costs.

Gears are mainly used to transmit power and torque. They have the characteristics of high transmission efficiency and stable transmission ratio. Curved bevel gears have the characteristics of gears. With their advantages of stable transmission and high strength, they are mostly used in high-speed and heavy-duty intersecting shaft transmission. They have very important use efficiency and are widely used in machine tools, automobiles, spacecraft and other fields.

As a kind of curved bevel gear, spiral bevel gear has a significant contribution to industrial development and a wide range of applications. The traditional processing form of spiral bevel gear mainly adopts gear milling, and large and small wheels with correct contact area are processed on the gear milling machine, but this method has low processing efficiency and serious waste of energy and materials, And can not meet the needs of mass production, which limits certain applications.

The forging process has little effect on the fiber structure inside the metal, and can eliminate the internal defects of the metal structure, compact and crisp, and obtain uniform and fine low magnification and high magnification structures; Forging can not only improve the strength and stiffness of metal, improve the forming efficiency, but also improve the material utilization rate and reduce the production cost. From forging bronze appliances and iron weapons in ancient times to many daily necessities in today’s life, the development of forging has experienced a long time, and the forging technology has made rapid progress in recent years.

It is of great significance to produce mechanical parts by forging. If the advantages of forging can be integrated into gears and gear like parts, it will be very beneficial to increase the strength of parts, such as blades of domestic aeroengines and automobile differential gears. Therefore, many scholars at home and abroad are very interested in the research of gear forging, Applying the forging method to the gear industry can not only improve the overall strength and stiffness of the gear, improve the ability of anti pitting and wear, but also reduce the overall size, increase the reliability of the working process and prolong the working life.

In terms of straight bevel gear forging, it has been produced and applied in industry, but the forging of spiral bevel gear with better performance is still in its infancy and has not been applied in industry. The reason is that compared with straight bevel gear, the teeth of spiral bevel gear and straight bevel gear are in curve shape, which increases the forming resistance and die difficulty. To ensure their accuracy, It is necessary to overcome the problem of filling rate and the influence of die drawing process, especially some spiral bevel gears with large surface cone angle or spiral angle. If the spiral bevel gears also realize forging mass production, their production efficiency, strength and service life will be improved, production cost will be reduced, and their application fields will be more extensive.

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