Reasons For Wrinkles in Metal Stamping Parts During The Deep Drawing Process

Reasons for wrinkles in metal stamping parts during the deep drawing process
Generally, wrinkles in the deep drawing process may be caused by the following reasons:
1. The stamping processability of the workpiece is poor, the stamping direction and the shape of the pressing surface are improperly determined, and it is difficult to control the flow rate of the material, causing wrinkles.
2. The feed resistance of the pressing surface is too small, and wrinkles are caused by excessive feeding. At this time, the pressure of the upper slider can be adjusted or the local shape of the deep drawing blank can be changed to increase the pressing area to eliminate it, or the drawing ribs can be locally increased to increase the feed resistance.
3. The contact of the pressing surface is not good, and in severe cases, it is loose inside and tight outside. After the material passes through the outer tight area, the pressing ring loses its pressing function, causing excessive feeding and wrinkles. At this time, the pressing surface should be re-grinded to ensure full contact, allowing the pin to be tight inside and loose outside.
4. Too much lubricating oil is applied.
5. The outer slider is improperly adjusted, causing inclination, making the pressure of the pressing surface uneven everywhere, and the loose places are prone to wrinkles.