How to choose the right die clearance to ensure the quality of stamped parts?

       Selecting the proper die clearance to ensure the quality of stamped parts requires comprehensive consideration of the following factors:
    Material properties
        Different materials have different strength, hardness, ductility and other properties. Softer and ductile materials, such as aluminum, the die clearance can be relatively large; while harder and stronger materials, such as stainless steel, the clearance should be smaller.
        For example, when stamping aluminum alloy watch fittings, the clearance can be selected as 8% - 10% of the material thickness; when stamping stainless steel watch fittings, the clearance may be 5% - 7% of the material thickness.
    Thickness of Stamped Parts
        Generally speaking, the thicker the material, the larger the die clearance. However, the ratio of clearance to material thickness is usually within a certain range.
        For example, for thin materials (less than 1mm), the clearance may be 5% - 8% of the material thickness; for thicker materials (more than 2mm), the clearance may be 10% - 15% of the material thickness.
    Accuracy requirements for stamped parts
        If stamped parts require high dimensional accuracy and surface quality, such as precision watch gears, a smaller die clearance should be selected to obtain better stamping results.

high speed punching machine

        On the contrary, for stamped parts with relatively low precision requirements, the die clearance can be increased appropriately.
    Type and structure of mold
        Different types of dies (e.g. single-process dies, composite dies, progressive dies) and the structural characteristics of the dies will also affect the choice of clearance.
        Molds with complex structures may require more precise gap control.
    Punching process

high speed punching machine

        Consider whether different stamping processes are used such as punching, dropping or drawing, each of which has different requirements for die clearance.
    Experience and Testing
        Refer to previous production experience with similar stampings to initially determine the die clearance.
        Carry out trial stamping and quality inspection and analysis of the stamped parts, and adjust and optimize the die clearance according to the actual results.
    In practice, it is usually necessary to combine the above multiple factors and through continuous testing and improvement to finally determine the most suitable die clearance, so as to ensure the quality of the stamped parts.

high speed punching machine