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Punching Force Calculation

The document provides information on how to calculate punching force required for various materials and hole sizes. The punching force in tons is calculated as 25 times the land distance times material thickness times material factor times shear factor. Thicker materials, those with higher shear strengths like steel, and larger hole sizes or land distances require more punching force. The punch tip shape can also affect the required force, with concave shapes requiring less force than a flat tip.

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Ch. Raviteja
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503 views2 pages

Punching Force Calculation

The document provides information on how to calculate punching force required for various materials and hole sizes. The punching force in tons is calculated as 25 times the land distance times material thickness times material factor times shear factor. Thicker materials, those with higher shear strengths like steel, and larger hole sizes or land distances require more punching force. The punch tip shape can also affect the required force, with concave shapes requiring less force than a flat tip.

Uploaded by

Ch. Raviteja
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Punching force calculation

How 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

Station Size & Land Distance

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

Shape "A" Dimension "Ld" Land Distance

A=Diameter Ld= 3.14 x A

A=B x 1.414 Ld= 4 x B

A=sqrt(B x B + C x C) Ld= 2 x (C + B)

A=C Ld= 2 x C - 2 x B + B x 3.14

A=2 x C Ld= 3 x A
Material factor The higher the shear strength of the material, the higher the tonnage required.

Material Factor
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 Steel 4.00
Material thickness The thicker the material, the higher the tonnage required.
ALUM. ALUM. STEEL STEEL
(mm) (inches) Gage (inches) (mm)
2.54 .100 10 .134 3.40
2.29 .090 11 .119 3.02
2.03 .080 12 .104 2.64
1.63 .064 14 .074 1.88
1.27 .050 16 .059 1.50
1.02 .040 18 .047 1.19
0.81 .032 20 .035 0.89
0.64 .025 22 .029 0.74
0.51 .020 24 .023 0.58
0.38 .015 26 .017 0.43

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

Size & Shape Factor


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

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