Calculation Method of Punch Tonnage

Regarding the calculation method of punch press tonnage, positioning can be done. control the laying-off length is 100 mm, as in the case of shearing machine. cutting cross-sectional area multiplied by the allowable shearing stress of material, 100 mm x 10 mm x allowable stress (unit is N/was). The calculated value of such units is N which turns into tons by dividing by 10000. Allowable shearing stress of the material need to be checked by yourself. If it is Q235 flat iron, to cut off it, you will need the force of 50 mm x 10 mm x 125 n/was = 62500 N = 6.25 tons, 16 t punching machine will do the trick.

Punch press burst pressure formula P = KLT Г Notes: k is the coefficient, generally equal to about 1.3. L: perimeter of the product after stamping, unit: mm; T is material thickness in mm; Г: shear strength of materials. Generally is 400 MPa. Unit of the result is newton. Being Divided by 9800N/T, the final number is what T is. This can only be roughly calculated. For the sake of safety, multiply the above value by 2, so that the calculated value also conforms to the impact pressure of the composite die. Punch press tonnage calculation No oblique cutting edge core punch Formula: punching core circumference (mm)× plate thickness (mm)× shear strength (KN/mm2)= punching shear force (KN) In metric tons: KN divided by 9.81 Core girth – the sum of the sides of any shape Material thickness – the thickness of the plate through which the core is punched The shear strength of the material — the physical properties of the plate, determined by the material of the plate. This can be found in the material manual. The shear strength of common materials is as follows: Aluminum 5052 H32
0.1724 Brass
0.2413 Low carbon steel
0.3447 Stainless steel
0.5171