In all kinds of structural parts of mechanical and electrical appliances, a large number of plate-shaped parts with material thickness T > 0.5-16 mm are widely used. Because of its high requirements of size and shape and position accuracy, especially along the direction of material thickness, it is required to be smooth and straight. The conventional traditional processing method is to meet the technical requirements by stamping, car, milling, planing, grinding and other cutting processing, which not only has a long process flow, many processes, but also consumes a lot of labor (set) time, low production efficiency, and parts interchangeability is not good, labor intensity, high cost, can not meet the needs of mass production. Metal stamping parts, metal stamping parts processing. These plate-shaped parts are difficult to complete by other processing methods. Even with the combination of various types of work, not only the efficiency is low, the quality is difficult to guarantee, but also the cost is very high.
The characteristics of fine blanking parts are as follows
1. The shape is complex, the dimension and position accuracy is high, most of the material thickness T > 3mm ~ 12.5mm, it is a fine blanking part of medium and thick plate, the punching section is straight and smooth, and the quality is comparable with the cutting process.
2. The contour of fine blanking parts is clear, the collapse angle is small, some hole edge distance and hole spacing (wall thickness) ≤ T, and there are pressure convex, counterbore, blind hole and hub flange forming fine blanking, especially the involute, cycloid, triangle, rectangle, trapezoid and other high-precision gear fine blanking parts with small modulus are difficult to be manufactured by other processing technologies.
3., all the first mock exam products are large scale production and the scale of the moderate economic production, including the automobile handbrake, the car, motorcycle and other fine punching parts, all of which are stampings from the original material and the products are no longer cutting.
4. Because of the cold work hardening effect, the surface hardness and strength of the fine blanking surface are greatly increased, and the friction resistance and weather resistance are improved. Therefore, the service life of fine blanking parts such as gear tooth profile and shaft sleeve on moving surface and friction surface will be improved.