Gear Tooth Rolling with Multi-Thickness Rollers for Surface Finish

The patent replaces the shot peening process (which uses kinetic impact of particles) with a rolling process that uses controlled mechanical pressure from rollers to introduce residual compressive stresses. This substitution eliminates the surface roughening effect of shot peening while achieving the same stress modification goal, thereby maintaining fatigue strength improvement without sacrificing surface smoothness.

The patent employs hydraulic pressure systems to apply controlled forces through rollers onto the tooth flanks. The hydraulic mechanism enables precise control of the rolling pressure, allowing introduction of residual compressive stresses without the need for complex mechanical feed systems, thus simplifying the overall process while maintaining surface quality.

The patent divides the forming operation into multiple independent forming tools, each responsible for specific tooth flanks or regions. This segmentation allows parallel processing of multiple features simultaneously, thereby increasing productivity. The modular design of individual forming tools keeps each unit relatively simple, offsetting the increased system complexity through functional decomposition.

The patent combines multiple forming tools and feed mechanisms into a single integrated device that processes multiple tooth flanks in one operation. By merging these functions into one coordinated system rather than requiring separate operations, the patent achieves high productivity while controlling overall device complexity through integration.