Interrupted turning hardened steel cutting tools--- BN-H21 grade CBN inserts

As we all know, the hardness of hardened steel work piece is high, and difficult to machine, especially for interrupted turning condition, so the requirements on the cutting tools materials improve gradually.

In current times, the materials of machining hardened steel include carbide alloy, ceramic and CBN cutting tools, but because of high hardness of hardened steel, it only suit for CBN inserts .

Hardened steel work piece usually belongs to finish turning after heat-treatment,has small working allowance,and it will be more economical with soldering CBN inserts.But some hardened steel exist interrupted turning condition,such as turning key seating or oil bore on the surface of the work piece.In the process,CBN inserts are easily chipping,so many manufacturers are difficult to guarantee the precision and durability for interrupted turning hardened steel.

But as the manufacturing required product quality increase gradually,it not only require the work piece high precision,but also require product quality improved.Hardened steel,as one of the most common parts in manufacturing is the most important factor which cutting tools enterprise need value.

As a professional CBN inserts manufacturer, Halnn has good development in the following areas: high hardness cast iron/steel, high hardness steel after heat-treatment, cast iron, ect.

Now,as the increase of hardened steel interrupted cutting condition work piece, we researched BN-H21 grade CBN insert which can interrupt turning hardened steel work piece ,and already has good development in gear industry.

Application case as follows: 

1.Workpiece information:

Name: Gear

Hardness:HRC53~61

Other information:φ97.02 ,Depth30mm

Process: finish turning inner bore

Machining condition: semi-interrupted turning

Precision requirement:Ra1.6

Tolerance: +0.02

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2.The cutting parameters of BN-H21 CBN insert interrupt turning gear inner bore

Inserts model:BN-H21 CCGW09T304-2S

Cutting Parameters:

N=500r/min;ap=0.08~0.12mm;Fr=0.08mm/r

Cutting Type:Dry Cutting

Working Efficiency:one cutting edge can machine 180~200piece work piece, and continue working about 3 hours. And guarantee the tolerance and precision requirement, and approval by customers .

More information:http://www.halnntools.com/pro/PCBN_inserts/DNMG.html