KORLOY

What are the recommended chip breakers and grades for Steel (P) machining?

Negative inserts : VB/LP chip breaker for medium to finishing, MP chip breaker for medium,
GR chip breaker for roughing, GH/HG/HV chip breaker for heavy machining
Positive inserts : VL chip breaker for finishing, MP chip breaker for medium to finishing, C25 chip breaker for medium.
As for the insert grades, NC3215 is 1st recommendation and NC3225 is 2nd recommendation.

What are the recommended chip breakers and grades for Stainless steel (M) machining?

Negative inserts: VP3 chip breaker for medium to finishing, MM chip breaker for medium, RM chip breaker for roughing
Positive inserts: VL chip breaker for finishing , MP chip breaker for medium to finishing,
C25 chip breaker for medium and heavier positive cutting applications
As for the insert grades, PC9030 is recommended for small amount of machining, and NC9125 is recommended for large amounts of machining.

What are the recommended chip breakers and grades for Cast iron (K) machining ?

Negative inserts: MP for finishing, MK for medium to finishing and medium, RK for roughing
Positive insert: MP for medium to finishing, C25 for medium.
As for the insert grades, NC6315 is 1st recommendation and NC6310 is 2nd recommendation

What are the recommended chip breakers and grades for Non-ferrous alloy (N) machining?

Negative insert: HA chip breaker for medium to finishing
Positive inserts: AK chip breaker for medium to finishing, AR chip breaker for medium
As for the insert grades, H01 is 1st recommendation

What are the recommended chip breakers and grades for Heat-resistant alloy (S) machining?

Negative insert: VP1 chip breaker for finishing, VP2 chip breaker for medium to finishing,
VP3 chip breaker medium, VP4 chip breaker for roughing
Positive inserts: VP1 chip breaker for finishing, MP chip breaker for medium
As for the insert grades, PC8110 is generally recommended and for industries such as aerospace and dental industries that require high-quality machining, UNC/UPC series are recommended.

What are the advantages of the high pressure coolant system?

It sprays a high-pressure coolant directly on the cutting edge to increase cooling efficiency and improve tool life in hard-to-cut materials that generate high heat during machining.
The high-pressure spraying provides an improved chip control, which can solve the problem of workpiece fractures and low productivity caused by long chips.

How to reduce vibration of boring bar with long overhang?

Carbide boring bars provide less vibration that is occurred during machining than steel boring bars.
It helps to minimize vibration when applying inserts with a small nose R.
Vibration can be reduced by decreasing the depth of cut and feed rate compared to general boring conditions, but it will results the increased machining time.
Applying tools with entering angles close to 90 degrees helps to reduce vibrations.

How to achieve the better surface roughness of the workpiece?

Cermet inserts have less chemical reactivity with steel, so better surface finish can be obtained compared to carbide inserts.
In general, the surface finish is improved when a product with a large nose R or a wiper insert is applied.
In general, as the feed per revolution is reduced, the surface finish of machining gets better.

What is a chip breaker?

It is a geometry or a step design for chip control and cutting load reduction. An unique model code is given according to the shape of the chip breakers.
As the chip curl radius is reduced, the chip will hit the insert or workpiece more frequently, increasing the role of the chip breaker.
It is also used for the purpose of reducing the cutting load, but as the chip curl radius becomes smaller, the cutting load increases.

How to improve chip control when long chips occur?

Increase feed rate or apply an insert of small nose R.
Increase depth of cut or apply an insert geometry with good chip breaking. (The one with narrow chip curl radius)