Technical development status of gear hobbing machine in China and abroad

Gear hobbing machines are divided into vertical and horizontal according to the structural form. Small gear hobbing machines and special gear hobbing machines for processing long shaft gears are mostly horizontal. Small gear hobbing machine is used to process instrument gears; Large high-precision gear hobbing machines generally adopt vertical and horizontal combined structures, and motion error detection and feedback devices are set on hob spindle and worktable to automatically compensate errors to improve accuracy. According to the degree of CNC, it is divided into ordinary gear hobbing machine, medium and low-grade CNC gear hobbing machine and high-grade CNC gear hobbing machine. The machining accuracy of ordinary gear hobbing machine is 7 ~ 6 levels, and the accuracy of NC gear hobbing machine can reach 4 ~ 3 levels.

After more than 100 years of development, gear hobbing technology and equipment in developed countries are becoming more and more mature and complete. In Europe, represented by Lieb Herr company of Germany, its typical LC series products meet the needs of gear processing in different industries and specifications, such as lc82, lc122, lc182, lc282, lc382 and other series machine tools, which are suitable for the needs of gear processing equipment in light vehicle, mini vehicle and car industries; LC502, LC802, LC1000 and other series of machine tools are suitable for the needs of gear processing equipment in heavy truck, lifting transportation and elevator industry. In America, represented by the GP / PE series products of Gleason pfauter hurth joint venture in the United States, such as gp130, gp200, gp300, gp200s, gp300g, pe300 and pe500, its biggest feature is the application of dry cutting process without coolant and full direct drive technology. In Asia, represented by GD series machine tools of Mitsubishi company in Japan, gd10cnc, gd20cnc and gd30cnc are applicable to the needs of gear processing equipment in light vehicle, mini vehicle and car industries, and gd50cnc, gd63cnc and gd100cnc are applicable to the needs of gear processing equipment in heavy vehicle, lifting transportation and elevator industries.

The manufacturing industry of gear hobbing mechanism in China started late, and the overall technical level lags behind foreign countries for 10-20 years. Although China’s CNC gear hobbing machines have been greatly developed and improved since the 1990s, most of them are CNC transformation based on the traditional gear hobbing machines. There is a large gap with foreign advanced products in terms of dynamic / static rigidity, overall transmission accuracy and reliability of CNC system, and the overall level is medium and low. Chinese gear hobbing machine manufacturers mainly include Chongqing machine tool factory and Nanjing No. 2 machine tool factory. The former has a market share of more than 60%. The six axis four linkage CNC high-speed gear hobbing machine represented by ys3120cnc6 represents the advanced level of gear hobbing machine in China. Its gear hob spindle speed (1200 R / min), radial fast moving speed (3000 mm / min), tangential fast moving speed (2000 mm / min), axial fast moving speed (3000 mm / min), processing performance, configuration conditions There is still a big gap between reliability and foreign advanced level, which is equivalent to the level of foreign countries in the late 1990s. Although China still lags behind in the field of NC high-speed gear hobbing, the super large gear hobbing machine made in China has reached the world level.

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