Reasons that affect the quality of metal stamping parts

1. Defects in the design of the flanging forming mold. The mold is shared for the left and right parts of a mold with two cavities. Because the content of this process is not only the flanging, but also the shape forming content. In addition, the part is particularly complex, the curved surface is narrow, and the forming requires concave molding. The material core is consistent with the forming surface, etc., which leads to a large forming stroke of the mold structure condition and a small pressing area. In the initial mold design, the designer only considered the feature of small blanking surface, but ignored the guiding slide stroke of blanking core. There are the following design defects: (1) The guide length of the blanking core is designed to be 125mm, and the actual guiding length is 115mm. Although within the design range, the 115mm movement of the holding part exceeds the effective guiding length of 10mm, and the holding of the blanking core is unstable , The disadvantages of inaccurate positioning of parts. (2) For a forming height of 115mm, a special guide slide must be designed. It cannot be guided by the sliding gap between the processing surface and the side wall of the die. The side slope causes the friction force to increase, the self-lubricating effect is extremely poor, and the strong lateral force is obtained. If it is not effectively eliminated, after mass production, the guide gap will increase due to long-term wear, and the normal guide effect of the mold will be lost in advance, which will cause a vicious quality accident. 2. There is an error between the mold processing parts and the drawing design. This part is the area that needs to be processed and guided in the drawing. However, because the die core is a complex surface, the guide surface is machined after the casting is formed, which results in a gap error after the machining surface and the guide surface of the die are slidingly matched, and the die core left/right appears during the normal operation of the mold. Swing right. Previous: The production process of stainless steel