At present, the research on precision plastic forming of bevel gear and spur gear has made great progress and has been applied to practical production. For various reasons, the helical gear is still processed in the traditional way.
Precision plastic forming of helical gear is a manufacturing technology of helical gear, which can directly obtain the complete tooth shape through precision die forging or other processes, and the tooth surface can be used without or only a little finish machining. It is characterized by:
(1) The structure and performance of helical gear are improved
Precision plastic forming makes the metal compressed in three directions, the grain and structure become thinner, and there are few micro defects. Plastic forming also makes the metal streamline continuously and evenly distributed along the tooth shape, which improves the mechanical properties of spiral gear. Generally speaking, plastic forming can increase the strength of gear teeth by more than 20%, increase the impact strength by about 20%, and prolong the service life of spiral gears by more than twice.
(2) Reduce energy consumption and cost
The workpiece can be heat treated or directly used without or only a small amount of finishing, which improves the production efficiency and material utilization and reduces the production cost. Generally speaking, plastic forming can increase the production efficiency by more than twice, increase the material utilization rate by about 40%, and reduce the mass production cost by more than 30%. Therefore, the market competitiveness of helical gear is greatly improved.