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What are the specific requirements for the thickness of the plate in the processing of stamping parts?

by:Fortuna     2021-03-03
The thickness of the sheet material must be strictly required for the processing of stamping parts, because the thickness of the material determines the gap of the mold. The thickness of the sheet material varies greatly, and the production with the same die and the same gap will affect the quality and accuracy of the product, and will cause serious damage to the mold, and even equipment accidents during the production of large stamping parts. The influence of sheet thickness tolerance in the following processes is: 1) In the punching process, the positive deviation of the sheet thickness is too large, or the negative deviation is too large, which can cause burrs. Sheets with too large negative deviations increase springback and affect dimensional accuracy. The sheet material with too large positive deviation increases the punching force and punching work, which may damage the punching equipment. The uneven thickness of the material will also cause unilateral burrs on the stamping parts. 2) In the bending process, materials with large negative deviations have a large rebound, resulting in inaccurate shapes and dimensions of the stamping parts, and easy to cause deflection and twisting. The positive deviation of the material thickness is too large, causing the bending surface to be squeezed, affecting the surface quality of the stamping parts and increasing the bending force and bending work, which may cause damage to the equipment. Uneven thickness will also cause inaccurate shape and size of stamping parts. 3) In the deep drawing process, if the negative deviation of the material thickness is too large, the shape will be uneven due to springback, and the height of the stamping parts will be insufficient, and the stamping parts will have a small mouth and bottom. At the same time, the pressing force will be reduced. . In addition, the relative increase of the gap between the convex and concave dies causes the material to wrinkle during the drawing process, which increases the difficulty of the metal material flow, thereby increasing the drawing force, and causes the stamping parts to crack at the corners of the die. The positive deviation of the material thickness is too large, which increases the friction between the material and the blank holder and the mold, and the gap between the convex and concave molds is relatively reduced, which increases the drawing force, causing the material to become thinner and the corners of the punch Cracking occurred. Moreover, the equipment may be overloaded due to the increase of drawing force and drawing work. The uneven thickness of the material will cause uneven wall thickness of the stamping parts and uneven height of the mouth edge. Severe uneven thickness of the material will cause the stamping parts to rupture, and for large stamping parts, it will also damage the mold and equipment. Previous post: The influence of the mechanical properties of metal materials on the stamping performance
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