When doing punching products, it is easy to cause the wrong position and size of the hole, the eccentric hole, the hole to open the hole, or the bending deformation of the hole. How to prevent these problems, we need to take the following measures.
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- Wrong hole location (thinning under bending and stretching).Strict control of bending radius, bending Angle and material thickness; The neutral layer of the material is trimmed so that the depth of the punch into the die and the depth of the punch to the die are appropriately even.
- A hole is different from a heart.Make sure the left and right bending height is correct; Correction for worn pins and pin plates; Reduce springback and ensure the parallelism and flatness of the two surfaces; Change the process route, first bending correction, then punching.
- The bending line is not parallel to the center line of the two holes, and the part whose bending height is less than the z small bending height shows an outward opening shape after bending
When bending, ensure z small bending height H(H≥R+2t (t material thickness; R bending radius); Change the shape of the parts being processed, without affecting the use of the bending height of the parts is less than z small. - The hole near the bending line is deformed.In the design of metal stamping parts, it is necessary to consider that the distance X from the bending parts to the hole edge is greater than a value X≥(1.5-2.0)t(bending plate thickness t); The auxiliary hole is designed at the bending part to absorb the bending deformation stress and prevent the hole deformation near the bending line. Generally, the scheme of bending first and then punching is adopted.
