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TECHNICAL GUIDE

PUNCHING TOOLS

Vol.30 THE ORDERING GUIDE(1) "HOW TO INSTRUCT SHAPE AND DIMENSIONS"

TECHNICAL GUIDE

PUNCHING TOOLS

Vol.30 THE ORDERING GUIDE(1)
"HOW TO INSTRUCT SHAPE AND DIMENSIONS"

This time, we summarized the instructions and precautions when ordering tools.

The way to instruct a required dimension and shape

Please specify the tool shape and dimensions based on the following punch shape and dimensions table.
Also, for shapes other than those shown in the table below,
please specify with a drawing attached.

Punch shape Round (RO) Square (SQ) Rectangle (RE) Obround (OB)
Figure of punch shape
Round (RO)
Round (RO)
Round (RO)
Round (RO)
Way to instruct φA A x A A x B A x B
Example φ10 10 x 10 5 x 20 5 x 20
ＳＤ ＷＤ Square with radius Rectangle with radius ＣＮ-42
Round (RO)
Round (RO)
Round (RO)
Round (RO)
Round (RO)
φA x B φA x B A x A R = C A x B R = C A x A R = C
φ20 x 16 φ20 x 16 10 x 10 R = 2 6 x 20 R = 1.5 10 x 10 R = 4
Punch shape Round (RO)
Figure of punch shape
Round (RO)
Way to instruct φA
Example φ10
Square (SQ) Rectangle (RE)
Round (RO)
Round (RO)
φA A x A
φ10 10 x 10
Obround (OB) ＳＤ
Round (RO)
Round (RO)
A x B φA x B
5 x 20 φ20 x 16
ＷＤ Square with radius
Round (RO)
Round (RO)
φA x B A x A R = C
φ20 x 16 10 x 10 R = 2
Rectangle with radius ＣＮ-42
Round (RO)
Round (RO)
A x B R = C A x A R = C
6 x 20 R = 1.5 10 x 10 R = 4

Example instruction for ordering

RE with radius / 6 x 20 R = 1.5
RE with radius / 6 x 20 R = 1.5

HOW TO INSTRUCT THE CLEARANCE

HOW TO INSTRUCT THE CLEARANCE

When specifying the clearance of the die, please indicate whether it is a clearance on both side or one side. Or you can also specify dimensions with clearance.

Name of clearance Detail
Both side B - A
Single side （B - A）÷ 2
Clearannce included B dimension

＜ Notice ＞

For standard clearances, the nominal dimension is the dimension of the punch,
but in the case of the blank type (minus clearance), the nominal dimension is the dimension of the die.

Dimension description Punch dimension Die dimension
Clearance for both side φ20 C = 0.3 φ20 φ20.3
Minus clearance φ20 minus C = 0.3 φ19.7 φ20

[Reference] METHOD FOR MEASURING CLEARANCE

Please calculate the clearance referring to the table below.

Clearance for both side = material thickness x clearance ratio

＜ Notice ＞

  • 1.The shear resistance should be about 80% of the tensile strength.
  • 2.For thick plates (exceeding t3.2), use the above calculation result × 1.4 as a guide.
  • 3.The minimum clearance is determined by the machine specification.
  • 4.Please also refer to Technical Guide Vol.6 “For clearance of the cutting die”.
Material Clearance Ratio Tensile Strength
(N/㎟）
Servo / Hydraulic Machine
(EM,AE etc)		 Mechanical Machine
(Pega,Coma etc)
Cold rolled steel 0.2 -0.25 0.15 Over 270
Hot rolled steel
Structure steel 0.2- 0.3 0.2 400 - 510
Stainless steel (soft) Over 520
Stainless steel (hard) Over 450
Alminium(Soft) 0.15 - 0.2 0.1 Over 95
Aluminum (hard) Over 215
Copper 0.2 - 0.25 0.15 Over 275
Brass(soft) 0.2 - 0.3 0.2 Over 410
Brass(hard) Over 590

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Vol.30 THE ORDERING GUIDE(1) "HOW TO INSTRUCT SHAPE AND DIMENSIONS"(443KB)

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