Why are there unilateral burrs in the processing of metal stamping parts

Why are there unilateral burrs in the processing of metal stamping parts? There are mainly the following aspects: 1. The guiding accuracy is poor. Excessive matching clearance of mold guides causes the * line in the upper and lower molds to not overlap and affects the uniformity of the stamping clearance. 2. Mold assembly error. If the punch is not perpendicular to the fixed plate or is loose due to wear, or the positioning pin is loose, the correct fixed position of the male and female molds cannot be ensured. 3. Installation error. When the non-guided mold is installed, the position of the upper and lower molds is not allowed to cause uneven clearance. The surface of the template or bottom plate of the mold is not clean, or the upper mold screw is improperly tightened, which will cause the working part to tilt. 4. The clearance of the punch guide rail is too large, the parallelism between the bottom surface of the slider and the work surface is not good, or the sliding direction of the slider is not perpendicular to the work surface. 5. The mold is deformed when it is working. For example, the leakage hole of the punching mattress board is too large, the template under the mold is too thin, and the rigidity of the die is not enough. The gap is affected by the deformation of the mold during the stamping. 6. When the maximum resistance of the workpiece during stamping exceeds 80% of the nominal pressure of the punch, it is easy to deform the 'C'-shaped bed for an open punch, so that the center lines of the upper and lower molds do not coincide. 7. Due to improper mold material selection, forging and heat treatment processes, the die is deformed during heat treatment or wire EDM, which affects the uniformity of the die gap. 8. The flatness of the sheet is poor. During the metal stamping process, the die is deformed. The punch with the smaller diameter is tilted. Related news: The characteristics of the main materials of stamping parts, the handling of common problems of stamping parts, the characteristics of scaffolding stamping parts and the importance of inspections