Technical Information

Vol. 3

TOOL MAINTENANCE
Tool maintenance has a major impact on the quality of the product and tooling life.
We summarized the time and method of appropriate maintenance this time.

GRIND STANDARD TOOLTIMING OF RE-GRINDING
In the case of punching hole, tool and material contact repeatedly, and as the numberof hits increases, tool wear progresses and the following phenomenon appears in theprocessed product.
①Increase burrs.
②Decreased surface accuracy of the shear surface.
③Decreased punching dimensional accuracy.
④The product warpage.
⑤Increase rolloverRollover

Shear planeBurrs

Fracture surface

Normally, the re-grinding time of punches and dies is determined by the size of burrs. In addition,
it is recommended to regularly observe the condition of the cutting edge (sagging, chipping).
As the wear of the cutting edge progresses, it leads to troubles such as,① Hasten an increasingly wear.
② Decreased quality of processed products.
③ Punch and die will break by increasing of punching load.
We recommend regrind at an appropriate time to maintain product quality.

GRIND METHOD
Please always use coolant when grinding. Grinding with dryor improper coolant may cause cracking or annealing of thecutting edge, which may cause punch and die damage.
After regrinding, remove the polishing burr with a # 600 grinding stone,
remove the coolant, and then apply a lubricant when incorporating it,
because a polishing burr will occur.
Also, adjust the length of the punch or die by the amount ofdimensions ground and the punch head or shim.

Grinding
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Re-grinding by surface grinder

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TOOL MAINTENANCEGENERAL MAINTENANCE

Remove adhesion using oil stone.
Move parallel to the side surface of punch.

■ REMOVAL OF ADHESION OF CUTTING EDGE
To remove the adhesion of cutting edge, we recommend using
an oil stone (#220).
※When you remove the adhesion, please be careful to keep
the cutting edge sharp.
For frequently used punch, we recommend CONIC original coating“SDP” which has an astonishing lifespan.

■ LUBRICATION OF THE SLIDE PARTThe sliding portion between the punch body and the guide, we recommend lubrication the oil(such as grease) and cleaning on a regular basis.
The iron powder generated during the punching process attached to the inner diameter of theguide may cause seizure.

■ KEY MAINTENANCE
It is recommended to replace it regularly as the wear of the turret key (key groove / key pin) has agreat effect on the quality of the processed product and the tooling life.
We will take care of the exchange key for tools.

■ CLEANING UP INSIDE THE TURRET
Even if tool maintenance is carried out sufficiently, if the turret to which the tool is attached contains
burrs or foreign substances from slug, it may cause misalignment or galling of the tooling.
When installing the tool, please clean the inside of the turret completely.Attaching a blank die to a turretthat is not in use prevents foreign matter from getting inside.

FORMING TOOLING MAINTENANCE■ GRIND FORMING TOOLING
Some forming tool has “cutting edge” and it is possible to be sharpened.
※Depending on the product, reshaping may change the tooling shape.
In addition, HSS tools and replaceable tools are also recommended for frequently used tools.

■ REPLACEMENT OF URETHANE SPRING OR SPRING
Some forming tools have urethane rubber or spring assembled inside tool for an ejector.
It is recommended to replace it early, as deterioration of the force of the urethane rubber or spring may leadto strip errors and damage to the tool.
Proper maintenance is recommended in order to use the tool for a longer time.
For More information,please contact
CONIC tool sales desk.