Machining hardened steel bearing cutting tools

Part 1 The advantages of turning hardened steel 

(1) High hardness ,high strength, no plastics

(2) Large cutting force, high cutting temperature

(3) Easy to produce chips because of the brittleness

(4) Bad Thermal Conductivity, and it can’t easily be taken away by the chips

Specific to hardened steel ,Halnn has its own cbn insert grades, we will show you as follows:

a. For hard turning hardened steel continuous Gear, we can choose BN-H10 CBN insert; 

b. For hard turning hardened steel interrupted Gear, we can choose BN-H20 CBN insert;

c. For hard turning hardened steel bearing ,we can choose BN-S200 CBN insert;

d. For rough machining hardened steel ,we can choose BN-S20 CBN insert.

Part 2 The advantages of Halnn cbn insert used for hard turning hardened steel

(1) High hardness

(2) Wear-resistance and impact resistance 

(3) Long lifetime 

(4) Roughness within Ra0.8

(5) High efficiency, low cost

(6) High speed cutting 

(7) Turning instead of grinding

The insert grades for common condition as follows:

a. Common cbn insert grade for rough machining and semi-finishing process:SNMN120408,SNMN120708,SNMN160816,SNMN201020,CNMN120408,CNMN120708

b. Common cbn insert grades for finishing process:CNGA120404,DNGA150604,TNGA160404,VNGA160404,CCGW09T304

c. Common insert arbor grades：CCLNR(L)2525M1204(1207),CSSNR(L)3232P1204(1207),CSRNR(L)4040S1207,S25T-CSKNR(L)1207,S32T-CCLNR(L)1207

Part 3 The application case of Halnn cbn insert for hard turning hardened steel and the cutting parameters 

(1) Halnn BN-H20 CBN insert hard turning synchronizer

Machining Part：Synchronizer gear sleeve

Machining Materials: Gear Steel Work piece

Hardness: HRC 58~63

Inserts Grade:BN-H20 VNGA160404

Cutting Type: Continuous Cutting ,Dry Cutting

Cutting Parameters: ap=0.15mm,Fr=0.1mm/r,Vc=170m/min

Inserts Materials Linear Speed(m/min) Lifetime/cutting edge Failure mode

Halnn BN-H20 170 350 Normal wear

Ceramic Inserts 120 70 Chipping

(2) Halnn BN-S200 CBN insert hard turning slewing ring bearings

Machining Part：Slewing ring bearings

Machining Materials:42CrMo

Work piece Hardness: HRC 47~55

Inserts Grade:BN-S200 RCGX090700

Cutting Type: Dry Cutting

Cutting Parameters: ap=0.5mm,Fr=0.45mm/r,Vc=110m/min

Inserts Materials Linear Speed(m/min) Lifetime/cutting dege Surface Roughness

Halnn BN-S20 110 8 Ra0.6~1.0

Ceramic Inserts 90 1 Ra0.8~1.6

Halnn superhard is a professional cbn insert manufacturer which include design, produce, service. Halnn is a famous CBN insert brand in cutting tools industry. Halnn always devote to researching new cbn insert to satisfy the customers’ needs.

More information on hard turning hardened steel ,please check http://www.halnntools.com/news/know/236.html, Or contact with us halnntools@gmail.com ,skype:cbn_inserts_angels