As we all know, the previous CBN inserts mainly are Brazed PCBN inserts, and widely used in finishing field. In practical machining process, there are many hard cast irons, interrupt hard turning hardened steel, RPM, white cast iron, PCBN inserts often chip and break. So Solid CBN inserts appear.
Part 1 Common Mistakes of CBN Inserts
1. Many people think that CBN inserts only suit for high speed turning
Because previous CBN inserts are imported brazed pcbn inserts, mainly suit for machining quenched steel, wear-resistant cast iron which hardness above HRC45, and superalloy which hardness above HRC35 and Pearlite gray cast iron which hardness below HRC30.The characters are they can realize high speed cutting.
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Workpiece Materials
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Cutting Speed(m/min)
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Feed Rate(mm/r)
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Cast iron (HB180~320)
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400~1000
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0.15~0.5
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Hard Cast iron(Cast Steel) HB400
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70~150
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0.15~0.5
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Quenched steel(≥HRC45)
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60~140
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0.15~0.5
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Superalloy(≥HRC35)
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100~240
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0.15~0.5
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From above table, we can see the cutting speed of CBN inserts is several times than carbide inserts. So many customers always think that CBN inserts only suit for high speed machining and just can be used in CNC processing Center, and didn’t suit for low speed machining.
2. The previous brazed PCBN inserts has not good roughness resistance, same with ceramic cutter
Part 2 The application field and machining effect of CBN inserts
The previous CBN inserts main process is finishing because it is brazed PCBN inserts, but with the continuous research of cutting tools industry, Solid CBN inserts appear which can be used for rough machining and interrupt turning and widely used in Non-ferrous metal field.
Halnn superhard, as the representative of superhard cutting tools enterprise, first launch the concept of ”solid cbn inserts” in China. And Halnn offer the following cutting tools and solutions which used for hard to machine materials and high efficiency machining:
1. Machining high hardness cast iron/cast steel, such as finish turning and rough machining high chromium cast iron, white cast iron and Ni-hard cast iron ect high hardness cast iron and high manganese steel ect wear-resistant steel (large allowance rough machining cast parts with sand, porosity )
2. Machining high hardness workpiece after heat-treatment, such as: hard turning quenched bearing steel, Carburizing steel, nitriding steel, tool steel, which can interrupt turning (the inserts has good roughness resistance and wear resistance,the cutting depth can arrive 7.5mm,and it can machining high hardness steel parts which hardness between HRC45 ~HRC79)
3. Other hard to machining materials :Machining Superalloy, powder Metallurgy, hard to melt alloy and WC, Ni-base ,Co-Base alloy and machining Hard surface of thermal spray welded parts(we accept customized only need you offer drawings )
4. High speed turning Common Gray Cast iron, Pearlite ductile iron(CBN inserts lifetime is 10~20 times than carbide alloy inserts )
Part 3 Halnn CBN inserts main grades
1.BN-K1 Solid CBN Inserts
BN-K1 CBN inserts mainly used for rough machining and finish machining high hardness cast iron, cutting depth can cut full of the blades and will not chip. BN-K1 suit for large scale castings and castings whose surface has sand and porosity.
2.BN-S20 Solid CBN Inserts
BN-S20 CBN inserts mainly used for rough machining and finish turning high hardness steel parts, it has good wear-resistance, can machining parts long time, such as high speed steel rolls, quenched gears, bearings and Ball Screw and Synchronizer.
3.BN-S30 Solid CBN Inserts
BN-S30 CBN inserts mainly used for rough machining, finish turning high common gray cast iron, high speed large allowance rough turning gray cast iron, and make sure finish requirements. And it widely used for machining automobile parts industry, such as brake disc, brake drum, wheel and engine block ect.
4.BN-H21 PCBN Inserts
BN-H21 PCBN inserts mainly used for finish turning quenched steel and it can interrupt turning and will not chip. The process precision can arrive Ra0.8~Ra0.4. For example,BN-H21 WNGA080404 finish turning gear surface which hardness is HRC60(the surface has 8 holes),one tip can continuous working more than 3 hours ,and machining 200 piece gears.
More information on Halnn main products, please click http://www.halnncbn.com/Products/,Or feel free to contact with us info@halnntools.com, Whatsapp:+8615617635382