How do I choose the tonnage of the punch?
Σb refers to the tensile strength of the stamping steel sheet material, which requires inspection manual, some online.
T refers to the material thickness with the same unit is mm, f is the blanking coefficient, generally take 1.3.
L refers to the length of the trimming line, for example, if a square hole, then the length of its trimming line is the square hole of the four sides of the length of the sum is just its circumference.
The result of the above multiplication is the punching force, but the unit is cattle, converted into tons to be in addition to a 9800, get the basic tonnage, and then consider the safety margin of the blanking and unloading push the top material and other
