Precision stamping parts processing plants have strict requirements for the thickness of the sheet metal, because the thickness of the material determines the gap of the die. The thickness of the sheet metal varies greatly, and the production with the same die and the same gap will affect the quality and accuracy of the product, and serious mold damage will be caused, and even equipment accidents will occur when producing large stamping parts.

1. In the blanking process, burrs can be formed if the positive error of the sheet thickness is too large or the negative error is too large. Sheets with too large negative error add springback, which affects the scale accuracy. Sheets with too large positive error add punching force and punching work, which may damage the stamping equipment. Uneven material thickness will also cause unilateral burrs in the stamping parts.

2. In the bending process, the material with a large negative error has a large rebound, forming the shape and size of the stamping part, and easy to form the phenomenon of deflection and bending. The positive error of the material thickness is too large, forming the bending surface extrusion, affecting the surface quality of the stamping part and adding bending force and bending work may cause damage to the equipment. Uneven thickness will also form the shape and size of the stamping part.

3. In the drawing process, the negative error of material thickness is too large, which will cause uneven shape due to springback, and will also cause insufficient height of stamping parts and small bottom of stamping parts. At the same time, it will also reduce the pressing force. In addition, the relative increase of convex and concave die voids causes the material to wrinkle during the drawing process, which adds difficulty in the movement of metal materials, thus increasing the drawing force, resulting in cracking of stamping parts at the rounded corners of the die. Precision stamping parts processing plants must pay attention to the thickness of the plate. If the positive error of material thickness is too large, the friction between the material and the blank holder ring and the die will increase, and the gap between the convex and concave dies will be relatively reduced, which will increase the drawing force, resulting in thinning of the material and cracking at the rounded corners of the punch. And because of the increase of the drawing force and the drawing work, it may become an equipment overload. Uneven material thickness will cause uneven wall thickness of the stamping part and uneven edge of the mouth. Serious uneven material thickness will cause cracking of the stamping part, and large stamping parts will also damage the mold and equipment.

This article is from EMAR Mold Co., Ltd. For more EMAR related information, please click: www.sjt-ic.com!