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What are the reasons for unilateral burrs in metal stamping parts?
What are the reasons for the unilateral burrs in the metal stamping parts? The main reasons for the unilateral burrs in the metal stamping parts are as follows: 1) Mold assembly errors. 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 guaranteed. 2) Poor guiding accuracy. Excessive fit of the die guides causes the center lines of the upper and lower dies to not overlap, which affects the uniformity of the stamping gap. 3) Installation error. When the non-guided mold is installed, the position of the upper and lower molds is not accurate, resulting in 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 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. 5) The gap between the punch guide rails 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. 6) When the maximum resistance of the workpiece during punching 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) The flatness of the sheet is poor, and the punch with a smaller diameter is tilted during the metal stamping process. 8) Due to improper die selection, forging and heat treatment processes, the die deforms during heat treatment or wire EDM, which affects the uniformity of the die gap. Previous post: What is the reason why the punch of the mold breaks during the metal stamping process?