Defects In Sheet Metal Drawing

Excessive thinning in areas of the sheet metal is also an unwanted defect.

Defects in sheet metal drawing.

Tearing is one of the most common defects. Figure a wrinkling in the flange or b in the wall c tearing d earing e surface scratches basic press working operation sheet metal working is also a metal forming operation where the material being worked is in the form of sheets the working is usually at room temperature. These defects include draw marks burnishing step rings etc. Incorrect blank shape and or size.

Defects that occur during deep drawing of sheet metal can be controlled by careful regulation of process factors. Wrinkles splits and springback are the three most common defects encountered during sheet metal stamping. This defect is caused by the anisotropy of the sheet metal. Excessive thinning thickening of the sheet during forming.

Defects in drawing process. The surface unevenness is mainly caused by the unqualified stamping die. Springback or final part deviation from nominal incorrect process or number of forming tools. This defect is caused by non uniform yielding of metal due to non uniform forces.

The flange of the blank undergoes radial drawing stress and tangential compressive stress during the stamping process which sometimes results in wrinkles. One of the primary defects that occurs in deep drawing operations is the wrinkling of sheet metal material generally in the wall or flange of the part. This defect is caused by improper punch die clearance and poor lubrication.