Punch metal power is one of the most common and important calculations that a metal fabricator needs to make when working on a given metal fabrication project. In this article, we are going to walk through how to calculate punch metal power in metal fabrication.
How is Punch Metal Power Calculated?
You can calculate punch power using the following number sets and equations:
- F = U x S x Rm
- F = Punch force in Kilonewton (10 kN = 1 metric ton)
- U = Circumference or perimeter of the punch shape (in mm)
- S = Sheet thickness (in mm)
- Rm = Tensile strength (in N/mm²)
- For Stainless Steel (1.4301) 720 N/mm²
- For Mild Steel (St 37) 420 N/mm²
- For Aluminium (AlMg3) 220 N/mm²
- f = factor between 0,5 – 0,95 when using punches with shear.
For round holes, the minimum diameter should be greater than or equal to the thickness of the sheet. For shaped holes, the shortest side should be greater than or equal to the thickness of the sheet.
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