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cause
The gap between the concave and convex molds is too small, causing cracks to occur on both sides of the convex mold and the concave mold without overlapping, and two extrusion shears occur at both ends of the section.
The gap between the concave and the punch is too large. When the punch is lowered, the cracks will occur late, and the shear will be completed like a tear, causing the cracks to not overlap.
The cutting edge is worn or rounded and chamfered, the cutting edge does not play a role in the division of the wedge, and the entire section has irregular tearing.
Solution
Reasonably choose the blanking gap of the concave and convex dies. Such punching and cutting are between extrusion and stretching. When the punch cuts into the material, the cutting edge forms a wedge, causing the sheet to produce nearly linear coincident cracks.
Refurbish the fillet or chamfer produced by the cutting edge of the concave and convex molds in time.
to ensure the vertical concentricity of the concave and convex molds, so that the matching clearance is even.
to ensure that the mold is installed vertically and smoothly.
