Glitch 

Causes: The punching gap is too large, too small or uneven; the edge of the mold becomes blunt. The center line of the convex and concave molds changes due to long-term vibration and impact, and the axes do not coincide, resulting in single-sided burrs; insufficient punching force.

Improvement measures: Reasonable mold precision design, processing and assembly; select reasonable mold materials and fix the blade at a fixed time; ensure the machining accuracy and assembly quality of the punch and die, ensure the verticality of the punch, withstand lateral pressure and The rigidity of the entire punch; when installing the punch, the correct clearance of the punch must be ensured, and the punch on the punch fixing plate must be firmly installed, and the ends of the upper and lower punches must be parallel to the working table of the printing machine. The press is required to have good rigidity, small elastic deformation, high track accuracy, and high parallelism between the gasket and the slider. The press is required to have sufficient punching force.

Warping

Causes: Action and reaction forces do not create moments on a line. (For example, the gap between the punch and the die is too large, the edge of the die has an inverted taper, or the contact area between the ejector and the workpiece is too small, resulting in warping deformation)

Improvement measures: The punching gap should be reasonable; the product punching should be as uniform as possible; in the die structure, the pressure plate (or pallet plate) should be in contact with the pressure plate plane to increase and have a certain pressure; check the edge of the die, if any reverse taper is found, the mold edge must be properly repaired and integrated. When the shape of the blanking part is complex and the shear force of the inner hole is uneven, the blanking force increases unevenly. Press the strip before blanking, or use a high-precision press for blanking. Before blanking, the sheet should be flattened. If the warping deformation cannot be eliminated, the blanking workpiece can be flattened again by the straightening die. Regularly remove the dirt in the mold cavity, lubricate the surface of the sheet material, and provide oil and gas holes in the mold structure.

When the part is bent, the size and shape are not qualified

Causes: Material rebound

Measures to reduce springback: Choose stamping materials with large elastic modulus and small yield points. Increase the correction process and use corrected bends instead of free bends; the material should be annealed before bending so that the cold-hardened material softens before bending. If the shape deformation occurs during the stamping process and is difficult to eliminate, the slope of the punch and die should be replaced or trimmed, and the punch gap is equal to the minimum material thickness.

Increase the contact area between the die and the workpiece and reduce the contact area between the punch and the workpiece. Use the "overcorrection" method to reduce the impact of bounces.

Wear and deformation of the positioner

The reason for the deformation makes the positioning of the strip inaccurate, and it is necessary to replace the new positioner.

Improvement measures: In the unguided bending mode, when adjusting the press, the position of the bottom dead center of the press slider is not properly adjusted, and the shape and size of the bending part are unqualified. The stamping device of the die fails or does not work at all to suppress the material, so it is necessary to adjust the stamping force or replace the pressure spring to make it work normally.

Cracks in the bend

Causes: Large burrs and unreasonable direction (burrs will cause regional stress concentration); large deformation and small bending radius; there are cracks in the embryo of the product.

Improvement measures: Reduce the burrs and the sides of the burrs in the bending area; when bending the workpiece, it is best to make the bending direction perpendicular to the fiber direction (rolling direction) of the material. Increase the radius of the fillets as much as possible; when bending, large bent pieces should be lubricated to reduce friction during bending. Eliminate cracked material when testing raw materials.

Conclusion

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