In addition to the material springback reasons mentioned in the previous article, the bending parts are defective, and the unreliable positioning of the blank will also make the bending parts produced by the precision stamping parts processing plant unqualified.

The positioning of the blank is unreliable, and the blank slides during the bending process, making the product unqualified. Ways to improve the reliability of positioning are:

1. The top device is composed of air cushion, rubber, spring, etc., passing through the top plate, applying reverse pressing force to the blank before it enters the bending. This increases the friction force on the blank and prevents the possible movement of the blank. It can also manufacture tooth patterns, pits, top cones, etc. on the top surface of the pressing rod, the pressing plate or the punch face to add the reliability of positioning.

2. Choose a reliable positioning form. The positioning is mainly in the form of external positioning and internal hole positioning. The external positioning operation is convenient, but the reliability is poor. The internal hole positioning operation is not convenient, and the use range is narrow, but the positioning is reliable. If the precision stamping parts processing plant chooses the internal hole positioning together with the pressing equipment, the positioning will have a better effect.

3. Asymmetrical force on the blank forms an unqualified shape. Uneven force on the asymmetrical workpiece during bending will cause the blank to move. In order to make the blank force uniform during bending, the asymmetrical workpiece can be combined into a symmetrical workpiece and bent at one time.

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