According to different materials, choosing different CBN inserts to process

1. Halnn Solid CBN inserts machining cast iron rolls and turning hardened steel
rolls
Halnn, as a professional Brand Manufacturer of researching and producing CBN Insert, always
devote to offering service for manufacturers in automotive, steel, petroleum, chemicals, machinery
ect industry, accumulate lots of successful application case and famous customers.
Mill Rolls, as the most important and main wear parts on the rolling mills, manufacturers will often
add some metal element in the processing in order to make sure the usage lifetime and obtain the
rolls durability, such as Chromium, Nickel ect. Mill Rolls can be divided in 3 kinds: cast iron rolls,
cast steel rolls and forged steel rolls depending on the materials. And specific to above three kinds
of mill rolls, Halnn already researched new materials CBN insert to machine, and has very obvious
affects.
1. Specific for cast iron rolls, it has high hardness, so Halnn recommend to BN-K1 solid cbn
inserts for roughing and finishing.
BN-K1 belongs to solid CBN insert, and mainly used in casting and powder metallurgy industry,
and can be used for both finishing and roughing. When BN-K1 Solid CBN inserts rough machining
alloy rolls, it will have good chipping resistance and fracture-resistance in a high temperature.
Application Case as follows,
Part: cast iron roll
Hardness: HSD80
Insert grade: BN-K1 RNMN200800
Cutting Type: Dry Cutting
Cutting parameter: ap=4mm, fr=1mm/r,
vc=55m/min
Insert material Feed rate(mm/r) Lifetime/cutting edge Failure mode

2. Halnn BN-K1 1 3 Normal wear
Ceramic insert 0.5 0.5 Chipping
Specific for cast steel rolls and forged steel rolls, the hardness must be more than HSD45 because
of steel materials, it can be used CBN insert. So Halnn recommend BN-S20 Solid CBN insert for
finishing and semi-finishing. And the tool life will be about 20 times of traditional insert, such as
carbide tools.
Application Case as follows,
Machining Part：Hardened Steel roll
Workpiece Hardness: HRC 60
Inserts Grade:BN-S20
Cutting Type: Dry Cutting
Cutting Parameters:
ap=1.7mm,Fr=0.7~0.8mm/r,Vc=70m/min
Inserts Materials Linear Speed(m/min) Cutting Depth(mm) Failure mode
Halnn BN-S20 70 1.7 Normal wear
Carbide Inserts 16 0.6 Chipping

3. Halnn BN-K1 and BN-S20 Solid CBN insert have already been researched in 2003 and 2005, and
also used in mill rolls industry. More than 10 years, Halnn CBN insert already well-known by most
manufacturers in China, because Halnn already help many customers solve their problems,
improve the processing efficiency and lower the producing cost. Halnn begin to develop the
international market and also have confidence to help more international mill rolls manufacturers
solve their problems and let Halnn walk out the world.