Punch tonnage calculation

Punch tonnage calculation

1.Calculate the punching position of CNC punching machine and CNC turret punching punch: (no oblique cutting edge punching core)：

Formula：

●Core circumference (mm)

●Sheet thickness (mm)

●Shear strength of material (mm)

●Punching force (mm)

●If converted to metric tons: use KN/9.81

●Core circumference - the total length of any shape

●Material thickness---the thickness of the material through which the punching core is to be punched

●The shear strength of the material - the material properties of the sheet, determined by the material of the sheet, can be found in the material manual.

Common shear strengths are as follows:

Example:

Punched on a 3.00mm thick low carbon steel sheet with a square shape and a side length of 20.00mm

●Core circumference = 80.00mm

●Material thickness = 3.00mm

●Shear strength = 0.3447KN/mm2

●Calculation: 80.00*3.00*0.3447=82.73KN

82.73KN/9.81=8.43 tons

2. CNC punching machine, CNC turret punching die gap.

2.1What is the gap between the CNC punching machine and the CNC turret punching die?

The clearance of the CNC punching machine and the CNC turret punching die refers to the distance between the punching core and the lower die when the punching core enters the lower die, which is usually referred to as the total gap.

2.2Why use the correct die clearance for CNC punch presses and CNC turret punch presses?

●Extend mold life

●Good returning effect

●Small burr

●Get cleaner and tidy holes

●Reduce the possibility of sticking

●Workpiece leveling

●The position of the hole is more accurate

●Minimum punching force required for punching

3.The optimal clearance of CNC punching machine and CNC turret punching die

It can combine shear cracks, uniform punching force, good punching quality and long die life.

4.CNC punching machine, CNC turret punching gap is too small

Secondary shearing occurs, the punching force increases, and the life of the mold is shortened.

5.Our recommended CNC punching machine, CNC turret punching die gap

●The percentage of the die gap to the material thickness

●Minimum gap life: 15%