Fine blanking is an advanced technique that combines the cost-effectiveness of stamping technology with the high precision found in traditional mechanical machining methods. This method serves as a compelling alternative to various manufacturing processes like casting, forging, turning, drilling, and grinding in diverse applications.

Fine blanking, which evolved from conventional blanking, has its roots in ordinary blanking. In the stamping technology, blanking is a distinct process that shares common features with other stamping processes. It offers increased productivity, optimized material utilization, reduced energy consumption, lower production costs, enhanced net shape fidelity resulting in lightweight products, and improved strength and rigidity.

However, standard blanking has some limitations due to the machining characteristics inherent in the process. In standard blanking, there is a relatively larger gap between the punch and die cavity, where the outer diameter of the punch is smaller than the inner diameter of the die cavity. This can lead to arch bending and premature tearing of the sheet metal before complete shearing, resulting in tear bands on approximately two-thirds of the sheared surface. The quality and precision of the sheared surface may not meet the technical requirements for certain components, necessitating additional machining.

In the production of thin sheet gears through stamping, individually subjecting each part to subsequent machining is impractical due to low efficiency, high costs, subpar quality, and inherent instability. Post-blanking processes involving drilling, reaming center holes, threading multiple blanks, and stacking them for gear rolling still face challenges in terms of efficiency, cost, and machining quality.

To address these issues, precision blanking, or fine blanking, has been developed. Before stamping, a pre-press plate tightly compresses the sheet metal, minimizing or eliminating the gap between the punch and die cavity. This ensures that the outer diameter of the punch is equal to or greater than the inner diameter of the die cavity, eliminating arch bending during the blanking process. As a result, fine blanking achieves complete shearing and a smooth cross-sectional cut, leading to a high-quality shear surface and precision in the finished components.

Fine Blanking
Fine Blanking