Hardware stretching partsWhy do we need to stretch multiple times? I think it's actually useless and unnecessary. I think it's very necessary. Usually, hardware stretching parts are stretched multiple times for the following four purposes:

1. Multiple stretching greatly improves the qualification rate of products in the production process, and is less likely to produce waste because the middle of multiple stretching is stress relieved and annealed to soften.

2. Multiple stretching can achieve more uniform stretching and reduce the scrap rate of products, as many one-time molding processes require high technological content.

3. Multiple stretching ensures the accuracy of the product, and the elongation coefficient and production efficiency have been greatly improved.

4. Stretch multiple times to prevent wrinkling of the stretched area.

Below are the causes and preventive measures for wrinkling of hardware stretching parts:

Wrinkling of hardware stretching parts refers to the rough and uneven surface of the workpiece during the stretching process, with excessively thick edges, which can seriously affect subsequent work. Wrinkling of hardware stretching parts is a concern for us. What causes wrinkling of stretching parts, how to prevent it, and finding these causes and methods can ensure the normal operation of our work, and the product can also be guaranteed.

There are many reasons for wrinkling of hardware stretching parts, mainly including the following aspects: the thickness of the stretched blank, that is, the sheet metal, is not enough, so the pressure it can withstand is naturally small, and it is easy to wrinkle during the stretching process; The stretching coefficient is small. If the corresponding stretching coefficient is not selected based on the texture of each billet, the degree of deformation will be difficult to control. If not controlled properly, deformation will occur; The edge pressing ring has been severely damaged and cannot apply the same pressure to the billet, resulting in uneven compression capacity and wrinkling.

We need to take preventive measures against the wrinkling of hardware stretching parts. The thickness of the stretched billet should be relatively thick, so that it can withstand relative pressure during the stretching process and is not easily deformed or wrinkled; By selecting the tensile coefficient corresponding to the quality of the billet, the degree of deformation can be easily controlled; The edge pressing ring needs to be replaced or repaired frequently to ensure even pressure on the billet and prevent wrinkling.