How to determine the gap of the metal drawing die?

Author: MULAN - Plastic Molding Manufacturer

The gap of the metal drawing die refers to the gap between the punch edge of the drawing die and the cutting edge of the die of the metal drawing die. The effect of the blanking gap on the punching force is that the smaller the gap, the smaller the compressive stress component in the deformation zone. The larger the stroke, the smaller the tensile stress component, the greater the deformation resistance of the material, and the greater the punching force. Conversely, the larger the gap, the larger the tensile stress component in the deformation zone, the lower the deformation resistance, and the smaller the punching force. So how should the mold manufacturer determine the clearance? The selection of the gap of the metal drawing die should make the punching achieve better section quality, higher dimensional accuracy, smaller punching force, and usually have a higher life of the metal drawing die.

The reasonable gap of the metal drawing die refers to a range value, the smallest and the largest reasonable gap. The determination of the gap of the metal drawing die is to comprehensively consider the influence of the gap on the punching force, the effect of the die life, the effect of the section quality, etc., and select an appropriate gap range as the reasonable gap of the metal drawing die. Reasonable gap refers to a range value.

When designing the metal drawing die in its body, it can be carried out according to the specific requirements of the workpiece and production. When the cross-sectional quality of the workpiece is not strictly required, in order to improve the life of the metal drawing die and reduce the punching force, a larger gap value can be selected. When the workpiece section quality and manufacturing tolerance requirements are high, a smaller gap value should be selected.

The above points should be paid attention to in determining the standard of metal molds. The main factors affecting the gap value are material properties and material thickness. The harder or thicker the material, the larger the gap value.