Design Points of Continuous Die for High Speed u200bu200bPrecision Metal Stamping

1. Calculation of punching and blanking force 1. Understanding the processing force required for precision punching (shearing) is also indispensable for the selection of punching machines or die design. 2. In the punching process, sometimes problems such as the breakage of the punch blade and the damage of the shoulder may occur. These problems are mostly caused by insufficient technical data of the parts, and the wrong choice of materials and shapes of the punch and die. 3. Calculation formula of punching force 2. Shear strength and tensile strength of various materials 3. Minimum punching diameter calculation The diameter of the smallest round hole punch in the die, or the thickness of the weakest part of the punch, has been calculated beforehand. Corresponding countermeasures can be made in advance. 4. Calculation of the effective length of the punch blade 1. The calculation formula for the longitudinal bending load of the punch 2. From the Euler formula, it can be seen that if the longitudinal bending strength P is to be improved, the discharge guide is used, and the longitudinal elastic coefficient is larger. Material (SKD→SKH→HAP), and shorten the length of the blade. 3. The longitudinal bending load P represents the value when the punch is damaged due to the longitudinal bending load, and the safety factor of 3 to 5 must be considered when selecting the punch. 4. When punching small holes, you need to pay special attention to the longitudinal bending load and the stress applied to the punch when selecting the punch. 5. [Technical parameters] Calculation of area, center of gravity, and second-order moment of section 5. Methods to reduce blanking force 1. As a method of reducing shear force, additional shear angles as shown in [Figure 2] can be used method. When blanking and punching, the cutting angle is taken on the die; when punching, the cutting angle is taken on the punch. 2. In the case of H size, the shear angle above the plate thickness is often taken. By the way, when the H dimension of the shear angle is about the thickness of the plate, the processing force can be reduced by about 30%.