The formula for calculating the punching force of the punching machine is p = KLT г, where: k is the coefficient, which is generally equal to 1, and L is the circumference of the punched product in mm; T is the thickness of the material in millimeters (mm); г is the shear strength of the material, in MPa. The unit of calculation is Newton. Divide the result by 9800N/T, and the result is t, which can only be roughly calculated. For the sake of safety, just multiply the above value by 2, so the calculated value also conforms to the punching force of the compound die.