# Tonnage calculation formula of punch press

Tonnage calculation formula of punch press

Tonnage is the key to the selection of punch presses. If the tonnage is not selected properly, it will reduce work efficiency on the one hand, and waste equipment investment on the other hand. Therefore, many friends have made difficulties in the tonnage selection of punch presses. But it does not matter, because the editor just knows the calculation formula about the tonnage of the punch, and the result can be obtained by calculating with this formula:

F=LTσbf

Where:

L refers to the length of the trimming line. For example, if the punch is to punch a square hole, its trimming length is the length of the four sides of the square hole, which is exactly its circumference.

T means the material thickness is the same as the above, the unit is mm, f is the blanking coefficient, generally 1.3.

σb refers to the tensile strength of the stamped steel plate material. This needs to be consulted in the manual, and there are some on the Internet.

The result obtained by multiplying the above is the punching force, but the unit is cattle. If you convert to ton, you need to divide 9800 to get the basic tonnage, and then consider the safety margin of blanking and the ejection of unloading and pushing parts. The force required for work, the tonnage of the punch is obtained by dividing this tonnage by the coefficient of 0.7.

There are several calculation methods for punch tonnage, but some calculation methods are too cumbersome and complicated to understand. And this one introduced in the article is one of the simpler calculation methods, how about it? Have you learned it? If you really don’t know how to choose, you can call our customer service number and we will provide the corresponding solution.