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Analysis of Processing Technology of Harmonic Speed ​​Reducer

update:07-06-2021
abstract:

The performance of the harmonic reducer largely depends […]

The performance of the harmonic reducer largely depends on the processing accuracy of the production equipment. In addition to the processing accuracy of the equipment, the processing technology is also indispensable. A good processing technology can not only improve the accuracy of mass production of products, but also save processing. Cycle can save costs to a large extent. At present, the domestic harmonic reducer manufacturers basically use the slow wire or gear hobbing process for the processing of rigid wheels and flexible wheels.

Slow walking
Slow wire is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of more than 6000 degrees, ablate metal, and cut into a workpiece. Since the slow-moving wire cutting machine adopts the method of continuous wire supply of the wire electrode, even if the wire electrode is worn out, it can be continuously supplemented, so the machining accuracy of the parts can be improved. Multi-cutting technology is a fundamental means to improve the machining accuracy and surface quality of low-speed wire EDM wire cutting. Generally, it is formed by cutting once, cutting twice to improve accuracy, and cutting more than three times to improve surface quality. The processing accuracy of the slow-moving wire is high, but the production efficiency is low due to the application of its multiple cutting technology. Therefore, the slow-moving silk process is more suitable for the proofing stage of the product rather than the mass production stage. Slow-moving wire can only cut steel due to its working principle, and ductile cast iron cannot be processed. Therefore, the use of slow-moving wire processing requires abandoning of nodular cast iron, which affects the service life of the harmonic reducer.
Hobbing
The gear hobbing process uses the principle of generative method to process gears with a hob, which is equivalent to a pair of staggered spiral wheels meshing. Gear hobbing is continuous cutting without idle stroke, so gear hobbing productivity is generally higher than gear shaping.
Shaping
Gear shaping is to process the tooth surfaces of internal and external gears or racks with a gear shaping knife according to the generation method or the forming method. The tooth profile accuracy of gear shaping is higher than that of hobbing, the roughness of the tooth surface after gear shaping is finer than that of hobbing, and the movement accuracy of gear shaping is worse than that of hobbing. The steel wheel shaping process can handle any material, including steel and ductile iron.
Flexible gear hobbing and rigid gear shaping have become the mainstream domestic harmonic reducer processing technology. Compared with slow wire feeding, gear hobbing and gear shaping have an efficiency improvement of nearly 10 times, which is suitable for mass production.
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