TONNAGE CALCULATION
In the punch press machine, the allowable tonnage depending on the machine.
Use the calculation formula below to prevent from over tonnage.
Circumference
| Round | Shaped |
| Diameter x 3.14 | (Length dimension + Width dimension) x 2 |
|
|
| Circumference = D x 3.14 | Circumference = (A + B) x 2 |
Shear resistance by material
| Material | Shear resistance (kg/mm²) |
| Mild Steel | 400 |
| SS400 | 450 |
| Stainless Steel | 600 |
| Aluminum | 200 |
| Copper | 300 |
| Brass | 400 |
Calculation example
The tonnage when piercing Φ40 to Mild Steel T=1.6mm.
If you do not know the shear resistance, please use about 80% of the shear resistance = tensile strength as a standard.
CALCULATION FORM
* After entering dimensions and plate thickness, select the material and press the Calculate button.
ADVICE ON ONE POINT
If the tonnage exceeds the allowable tonnage of the machine,
reduce the tonnage by the following method.
- 1.Put shear angle on punch edge. (Allows you to reduce tonnages around 10 to 50% by shear angle.)
- 2.Piercing several times. (Reducing tonnages by piercing several times)
- 3.When using cluster tooling, the tonnages can be reduced by making a difference in length of punch that makes same effect as shear angle.