Precision forging of helical gear

Precision forging of helical gear is a research hotspot at home and abroad in recent years. There are mainly the following problems:

  1. Tooth profile filling is not full. In the process of precision forging, the corners of spiral gears are often difficult to fill, resulting in unqualified products. Therefore, how to fill the tooth cavity is the primary factor to ensure the quality of spiral gear. It is even more priority than how to reduce the forming force, which is more urgent in practical production.
  2. Low profile accuracy. In general, for the helical gear with low precision requirements, the gear teeth after precision forging can be directly put into production without machining or a little processing, which requires the forged helical gear to have more accurate dimensions. During precision forging, the accuracy of helical gear is determined by the tooth model cavity. Due to the influence of elastic factors, thermal shrinkage deformation factors and high-temperature secondary oxidation, the tooth profile of tooth model cavity and forging tooth profile cannot be completely consistent. When machining the tooth model cavity, in order to ensure its accuracy, electrode machining is adopted. During electrode machining, there will be discharge gap and electrode burning, and the tooth shape of electrode and tooth model cavity cannot be consistent. Therefore, the design and machining of tooth profile of tooth die plays an important role in the precision forging of spiral gear, and it is a difficult point in the precision forging technology of spiral gear.
  3. High forming force and low die life. In the precision forging of helical gear, in order to ensure the full tooth shape, the forging force is often increased, resulting in too high deformation force and reduced die life.
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