Technical Information

Vol. 5

MATERIAL FOR TOOLING
Selection of tool material (Type of material) is very important in terms of the quality of the processed productand the tool life (processing cost).
This time, we summarized the typical material for tooling.

MATERIAL OF PUNCH
We use the following material for punch body.
D2 (SKD)
M2 (SKH)

Fig.1 Material properties of the punchHigh↑

M2Abrasion
resistanceD2Toughness → HighCharacteristics of each steel
D2 (SKD)
It is a typical tool steel for sheet metal processing which is excellent in mechanical properties
and heat treatment characteristics.
We adopt Super-subzero treatment to further improve wear resistance.
M2(SKH)
It is one of the most widely used materials among M2.
Compared to D2, it is a material excellent in abrasion resistance, impact resistance and toughness.
It is suitable materials such as stainless steel and a large amount production.

MATERIAL OF DIE

Fig.2 Material properties of the Die

We use the following material for die.
Improved D2
M2（SKH）

HighM2↑

D2

Abrasion
resistance

Improved D2Toughness → HighCharacteristics of steel
Improved D2

A material with improved toughness and chipping resistance by refining carbides.
It has toughness equal to or higher than that of M2.

Continue to the next page

MATERIAL FOR TOOLING

HOW TO SELECT MATERIAL
Selection of the material of the tool is done by processing conditions (such as the material ofsheet metal, the number of hits and the accuracy of product).
The guides of selection are as follows.
GUIDE FOR SELECTING D2・Small production
・Punching cold roll and aluminum・Punching the thin sheet
・There is a possibility of design change(shape change).
・Low price (As a result, high-speed steelmay be cheaper.)GUIDE FOR SELECTING M2
・Large production
・Punching stainless steel
・Punching the thick sheet
・In combination with the coating process・Consider about dimensional change dueto wear.
・In the case of D2, the edge strength isinsufficient. (When chipping or breakage
occurs due to lack of strength.)

In case of large number of production or difficult-working materials, it is recommended to use incombination with super-dry punch or coating process tools.
Not only the insufficient strength of the tool but also other factors (such as slug pulling,
misalignment of the turret, insufficient mounting of the tool, etc.) can be considered as
the cause of the breakage of the tool.
We recommend that you select the material after carefully investigating the cause of the damage.

（See our Technical Guidance “Vol.2 Life countermeasure for tooling” for more detail about SDP.）OTHER MATERIAL FOR TOOLINGCARBON STEELS FOR MACHINE STRUCTURAL MATERIAL.
It is one of the representative steel types of metal materials.
In the tool, it is used for part that is not processed directly on the material.
(Tool head, retainer collar etc.)
CHROMIUM MOLYBDENUM STEEL (SCM)
It is used for parts that require middle strength. (Guide, ejector of forming tool etc.)
CARBON TOOL STEEL (SK)
It is used for parts that require relatively high hardness. (Key-pin, ejector of forming tool etc.)
ALLOY TOOL STEEL (SKS)
Used for a part this needs equal hardness as D2 steel. (Pin holder etc.)

For More information,please contact
CONIC tool sales desk.