Technical Information

Vol. 33

THE ORDERING GUIDE 4
SELECT SPECIFICATION OF PUNCH
When ordering punches, please select and refer to the following specifications.
■Selection of punch material and surface treatment
GradeHighPerformance

Type of Punch

Characteristic

Super Dry Punch(SDP)

Excellent durability is realized by the W effect of the “super-hard film andpermeation layer to punch base material” on the surface.
Suitable for dry processing without press oil.
Excellent effect on difficult-to-process materials such as stainless steel.
Currently, Only the following shapes are supported.
●ROHeavy Duty Punch(HDP)
Conic Long Life Punch(CLP)
Conic Hard Punch(CHP)
CostPerformanceHigh Speed Steel(HSS)D2●SQ●RE●OBCoating with excellent heat resistance.
The coating is difficult to peel off even with heat generated continuously.
Suitable for a wide range of work materials such as high corrosion resistant
hot-dip galvanized steel sheets, mainly Mild Steel.
It has been made “Special Treatment” to the punch cutting edge.
This is a low-cost tool that is effective not only for cutting edge wear but
also for preventing galling.
Supports a wide range from Aluminum to Mild steel and Stainless steel.
Harder than D2 and has excellent durability.
The most basic type of tool material. It is a basic tool that excels incost performance and adapts to all workpieces.

■Selection of punch shear angle
The shear angle of the punch is effective for reducing punching load, preventing slug pulling,and silencing.
When ordering, please indicate the presence and type of shear angle.
Shear option
Roof top shear

Concave shear

Inverted shear

Characteristec
Best shear for punching with maximum tonnages.
CONIC standard angle of shear is 2°or 5°.
Easy to sharpened up.
Best shear for slitting and nibbling
because it inverts stresses.
More susceptible to breakage becauseof a sharp focal point for stresses
when piercing thick material.
Defficult to sharpen without dedicatedjigs.

Resistant direction to punch tip
In case ofroof top shear

In case ofconcave shear※In general, small diameter punches do not have a shear angle because the removal load is small.
Also, there is no shear angle for the blank type (if the slug is a product) because the blank isdeformed.
For details, see Technical Information Vol.24.

Continue to the next pageTHE ORDERING GUIDE 4■Slug ejector
Slug ejector is effective in preventing slug pulling.
The round shape is φ4 or more, and the standard
square shape is attached to the punch edge of 6
width or more as standard in our company.
In addition, if you give us an instruction, we will
attach it to a standard square blade with a widthof 6 or more for free.
When processing thick plates with small-diameterand narrow punches, the slug ejector holes may
cause punch damage. In that case, please indicate“No slug ejector”.

Fig.1 Pushing slug mechanism by slug ejector
Punch

Slug ejector

DiePunch

DieSlug■Minutes corner “R” on punch tip
As a measure to prevent chipping at the blade edge,
we have added a small R of about R0.2 to the four
corners of square and rectangle punches.
If you don’t need it, please let us know.

Fig.2 Minutes corner R on the punch tip ofSQ and RE shape punches.

Minute R■Coating treatment
In addition to Super Dry Punch (SDP), Heavy Duty Punch (HDP), Conic Long Life Punch (CLP),and Conic Hard Punch (CHP), you can also select various “coating treatments” that improve thelife of the tool.
Coating option

Characteristec

Tuff coat

Salt bath nitriding treatment to our premium high speed steel.
It shows high performance preventing from peeling off.
Hardness of surface is Hv900 - 1,100.

TiCN coat

Ticn treatment to our premium high speed steel.
Hardness of surface is Hv2,700 - 3,000 which is harder than Tin coating.

TiN coat

Tin treatment for our premium high speed steel. Good for mild steel.
Hardness of surface is Hv2,000 - 2,500.

CrN coat

CrN treatment to our premium high speed steel. Good for aluminum.
Hardness of surface is Hv1,700 - 2,100.

■Air-hole specification
From the air hole in the center position of punch body,compressed air is blown directly onto the slug to forcibly drop the slug.

Fig.3 Air-hole specification
Compressed airSlug
For More information,please contact
CONIC tool sales desk.