Eight common problems with stamped parts

1. Burrs: Excessive, insufficient, uneven, concave, and convex die cutting gaps, as well as poor punching conditions, can all result in burrs.

2. Bent and uneven parts:

a. During the punching process, the stretching and bending forces of the parts are high, and they are prone to warping. The improvement method can be to use a punch and a pressing plate to tightly press and maintain a sharp cutting edge during punching,

They can all achieve good results.

b. When the shape of the workpiece is complex, the shear force around the workpiece is uneven, resulting in a force from the periphery to the center, causing the workpiece to warp. The solution is to increase the pressing force.

c. When there is pressure from oil, air, etc. between the die and the workpiece, or between workpieces, the workpiece will warp, especially for thin and soft materials. By evenly applying oil

Set up exhaust holes to eliminate warping.

3. Wrinkles:

a. The stretching depth of stamped parts is too deep, causing the sheet metal to flow too quickly during the feeding process, resulting in wrinkling.

b. During the stretching process of stamped parts, the R angle of the concave die is too large, which causes the convex die to be unable to press the material during the stretching process, resulting in the rapid flow of the sheet metal and the formation of wrinkles.

c. The pressing ribs of stamping parts are unreasonable, too small and positioned incorrectly, which cannot effectively prevent the sheet metal from flowing too quickly and forming wrinkles.

d. The unreasonable positioning design of the mold leads to the inability to press the material during the stretching process of the stamped part or the pressing edge is too small, resulting in the inability to press the material during the stretching process and wrinkling.

The solution to wrinkling is to use a reasonable pressing device and a reasonable use of stretching ribs.

4. Dimensional accuracy error:

a. The dimensional accuracy of the cutting edge in mold manufacturing does not meet the standard, resulting in dimensional deviations of the parts.

b. In stamping production, the workpiece rebounds, causing the positioning surface of the next process to not fully match the workpiece, resulting in deformation during the stamping process and affecting dimensional accuracy.

c. Poor positioning of the parts, unreasonable design, and movement of the parts during stamping. There are also design defects in the components, which result in inaccurate positioning and affect dimensional accuracy.

d. Due to improper adjustment of the previous process or wear of the rounded corners, the deformation of multi process parts may be uneven, resulting in dimensional changes after punching. Regarding the issues of dimensional accuracy caused by the above points

The reason is that we need to take necessary control measures, such as reasonable stamping part shapes and tolerance levels, improving mold manufacturing accuracy, and designing rebound compensation mechanisms.

5. Crushing injury:

a. There are impurities on the surface of the material. Check the surface of the material for debris during stamping, and clean it with an air gun and a cloth if there are any debris.

b. There are foreign objects on the surface of the mold. Use tools to clean foreign objects on the surface of the mold, and select the appropriate lower mold gap based on the thickness of the sheet metal.

c. The mold material has magnetism. Change the processing sequence and process the workpiece from outside to inside, line by line. Cut the edges first and then punch the mesh. Special forming stamping may cause deformation,

It is possible that the pressure is too high and the spring in the mold needs to be replaced.

d. Stamping oil does not meet the requirements. Replace the current stamping oil with a specialized stamping oil containing sulfurized extreme pressure additives.

6. Scratches: The main reason for scratches on parts is that there are sharp scars or metal dust falling into the mold. The preventive measure is to polish the traces on the mold and clean the metal dust.

7. Bottom crack: The main reason for the bottom crack of the part is poor plasticity of the material or too tight compression of the mold edge ring. The preventive measure is to replace the material with good plasticity or loosen the edge press.

8. Wrinkle on the side wall: The main cause of wrinkling on the side wall of the part is insufficient material thickness (if relatively small, the thickness can be reduced) or eccentricity during the installation of the upper and lower molds. Causing a large gap on one side,

The gap on the other side is smaller. The preventive measure is to immediately replace the material and readjust the mold.