Orbiting Scroll Member Hardness via Preliminary Casting

The patent applies preliminary action by forming the cast iron with a thickness greater than the final required thickness before machining. This allows the spiraling part to be pre-formed with sufficient material to achieve the desired hardness through heat treatment, while still enabling the final product to have the correct thin profile after cutting. The preliminary formation of the casting with excessive thickness resolves the contradiction by providing raw material flexibility without complicating the overall manufacturing process.

The patent applies local quality by concentrating the increased thickness specifically in the spiraling part where it is most needed for wear resistance and hardness, while maintaining the overall compact size of the compression mechanism. The casting is designed with localized thickness variation - thicker in the spiraling compression area and thinner in other regions - allowing strength enhancement without proportionally increasing the entire mechanism size. This localized approach resolves the contradiction by providing targeted reinforcement rather than uniform thickening.

The patent applies preliminary action by creating a casting with excessive thickness before the final machining step. This preliminary formation allows the spiraling part to have sufficient heat capacity and hardness during the cooling phase, preventing wear and deformation. The final thin profile is achieved through cutting after the hardness has been established, maintaining manufacturing efficiency while ensuring reliability. The preliminary thick formation resolves the contradiction by decoupling the heat capacity requirement from the final dimensional requirement.