Convex Bearing Diamond Die for Accurate Irregular Wire Drawing

The patent applies curvature by forming convex portions on the sides of the bearing cross-section. Specifically, each side of the bearing portion has a convex shape toward the center, creating a curved surface that improves wire shape accuracy. This curvature modifies the contact between the die and wire, enabling precise formation of irregular wire shapes while maintaining structural feasibility.

The patent implements local quality by differentiating the bearing cross-section into specific regions with distinct functions. The convex portions are localized on specific sides of the bearing, while other regions maintain different characteristics. This localized modification allows precise control over wire shaping in specific areas without requiring complete redesign of the entire die structure.

The convex portions create smooth curved surfaces in the bearing region, which directly improve the surface finish of the drawn wire. The curved geometry eliminates sharp corners and stress concentrations that would otherwise cause surface defects, achieving better surface quality through geometric design rather than post-processing.

The patent applies surface quality enhancement locally to the bearing portion where wire contact occurs. The convex curved surfaces are specifically positioned in the bearing region to improve surface finish, while other parts of the die structure maintain their conventional design, balancing manufacturing feasibility with surface quality requirements.