DSM DSM Manufacturing Company, precision sheet metal products
line
Technical reference
line
spacecosmetics
spacetolerances
spacematerials
spacedesign
spacethickness
spacefinishes
spaceforces
spaceunits converter

dsm capabilities
technical reference
corporate data
job opportunities
contact us
customers only
site index
flatline.gif
line
line
Punching force calculation

blockHow to calculate punching force in tons

Punching force = 25 x Land distance x Material thickness x Material factor x Shear factor

Note: 1 Ton = 8.90 kN. 1kN = .112 Tons

line

blockStation Size & Land Distance

The larger the perimeter of the cut hole, the larger the tonnage required.

Shape"A" Dimension"Ld" Land Distance
CircleA=DiameterLd= 3.14 x A
SquareA=B x 1.414Ld= 4 x B
RectangleA=sqrt(B x B + C x C)Ld= 2 x (C + B)
ObroundA=CLd= 2 x C - 2 x B + B x 3.14
HexA=2 x CLd= 3 x A

line

blockMaterial factor

The higher the shear strength of the material, the higher the tonnage required.

    MaterialFactor
    Aluminum 3003-H14 .30
    Aluminum 5052-H32 .38
    Aluminum 6061-T6 .50
    Copper .57
    Brass 260-HH .70
    Mild Steel 1.00
    Cold Drawn Steel 1.20
    Stainless Steel 304 1.40
    Tempered Spring Steel4.00
line

blockMaterial thickness

The thicker the material, the higher the tonnage required.

    ALUM.ALUM.STEELSTEEL
    (mm)(inches)Gage(inches)(mm)
    2.54.10010.1343.40
    2.29.09011.1193.02
    2.03.08012.1042.64
    1.63.06414.0741.88
    1.27.05016.0591.50
    1.02.04018.0471.19
    0.81.03220.0350.89
    0.64.02522.0290.74
    0.51.02024.0230.58
    0.38.01526.0170.43
line

blockShear factor

The face of the punch tip may be ground flat, roof-topped, or concave to reduce the amount of tonnage required.

    Size & ShapeFactor
    0.0 Flat 1.00
    .062" (1.6mm) Concave .30
    .125" (3.2mm) Concave .55
    .250" (6.4mm) Concave .60
    .438" (11.1mm) Concave .75

spacer
linecross

Talk to us! 1(800) 886-6376
Copyright 2004 DSM Manufacturing Co.