The main material for sheet metal machining work is steel. In the process of rolling the product to a sheet metal position for down-materialization, processing, forming, assembly, and connection to sheet metal work, the steel is subjected to external forces and heated deformation processing, resulting in stress and deformation. Some deformations are the technical requirements of the product, and some deformations exceed the technical requirements. Stresses and deformations that exceed technical requirements are called deformation defects. To this end, appropriate process and technical measures should be taken to prevent.

Causes of steel deformation defects during sheet processing:

1. The deformation of raw materials mainly comes from the rolling process, the transportation process and the improper stacking of steel.

In the rolling process of steel, if there are problems such as uneven plate heating, uneven roller bending and inconsistent roller seams, the compression of the plate in the width direction will be uneven. The stretched part is constrained by the less stretched part to create the pressure stress, and the less stretched part produces the pull stress. Therefore, under pressure stress, the longer part may be unstable, resulting in deformation.

2. Sheet metal processing parts steel plate, especially thin plate, prone to local uneven deformation, wrinkle deformation or relatively smooth large wave deformation, and sometimes even distortion. Larger grooved steels are prone to bending and deformation, and smaller angled steels are prone to deformation. After hot rolling, the steel has water or moisture in the cooling process, which can deform.