The cutting Parameters and application case of Halnn Superhard CBN Cutting Tools hard turning bearing steel

Because of the high hardness of the bearing steel after heat treatment ,many cutting tools such as carbide cutting tools ,ceramic cutting tools and traditional cbn cutting tools can not performance well on hard turning bearing steel .Even though ceramic cutting tools and traditional cbn cutting tools can be used for finishing process, they also can not used for interrupted turning and large working allowance machining .

Halnn superhard researched new non-metal adhesive cbn cutting tools BN-S20 grade through continuous effort which break the myth of the cubic boron nitride blade can not be used for strong interrupted turning and large working allowance turning hardened steel, BN-S20 CBN Cutting Tools is a worldwide breakthrough in cutting tools industry.

Halnn BN-S20 not only make sure the hardness and the wear resistance of the traditional CBN Cutting Tools,but also improve the impact toughness ,fracture resistance and shock resistance.

The following will show you the cutting parameters of Halnn BN-S20 hard turning bearing steel :

Machining Materials Recommend Cutting Parameters and CBN Cutting Tools grade

Cutting Speed Vc(m/min) Cutting Depth ap(mm) Feed Rate(mm/r) Common CBN Cutting Tools Grade

Bearing Steel (Above HRC45) 60~250 ≤1 0.05-0.35 BN-S20,BN-S200,BN-H11

Because the characters of the bearing steel part will be easily change, we will have different insert grade specific to different working allowance for turning large bearing steel after heat treatment .

(1)When the working allowance is above 2mm, we will choose Halnn BN-S20 CBN Cutting Tools ,which belongs to non-metal adhesive solid cbn cutting tools .As the following figure:

(2) When the working allowance is less than 2mm,we will choose Halnn BN-S200 and BN-H11 CBN Cutting Tools (as following figure) , BN-S200 belongs to solid CBN Cutting Tools ,mainly used for finishing process,BN-H11 belongs to welded CBN Cutting Tools. Both the two cutting tools cutting depth can be controlled within 0.5mm. It will have best effect.

Now we will share you 2 application case that Halnn CBN Cutting Tools hard turning bearing steel part :

(1) The application case of BN-S200 machining slewing bearings : 

Finish turning slewing bearing raceway and the surface

Hardness:HRC47~55,Cutting Parameters: ap=0.5mm,Fr=0.45mm/r,Vc=110m/min

Processing effect: The lifetime will be more than 7 times than ceramic cutting tools ,and the surface roughness can be controlled within Ra0.6~1.0.

(2) The application case of Halnn BN-H11 CBN Cutting Tools machining Metallurgical bearings:

Finish turning the cylinder and inner bore of the Metallurgical bearings

Hardness:HRC62

Cutting Parameters: ap=0.5mm,Fr=0.12mm/r,Vc=140m/min

Processing effect: Compared imported PCBN Cutting Tools ,it haslonger lifetime, the surface roughness will be within Ra0.8.

More related turning bearing steel ,please check http://www.halnntools.com/news/know/257.html ,Other information on products ,please feel free to contact with us halnntools@gmail.com ,skype:cbn_inserts_angels ,whatsapp:+8618695866134,Wechat:Halnntools.

Halnn CBN insert used for hard turning the wind power bearing

Wind Power bearings,also named slewing bearing. Because of the bad environment and the high processing costs ,the manufacturers usually use the 42CrMo with excellent performance for the main materials, it also be called 42CrMo bearings.

Wind Power Bearing belongs to forging moulding. In order to improve the lifetime of the wind power bearings,the manufacturers usually use heat treatment process to improve the usage performance after rough machining.The hardness of the wind power bearing after heat treatment usually is above HRC45.

The inserts which used for finish turning wind power bearings must have high hardness, wear resistance and impact resistance.Halnn Superhard researched cbn insert can satisfy all the requirements. Specific to the different hardness and the deformation of the wind power bearing after heat treatment,Halnn has different grades cbn inserts to satisfy the manufacturers.

For example, Finish turning wind power bearing ,the working allowance is less than 2mm,Halnn choose BN-S200 solid cbn inserts hard turning the raceway and the end surface of the wind power bearings. The cutting parameters as follows: Vc=110m/min, Fr=0.45m/r,ap=0.5mm,The insert grade is RCGX090700,the precision can arrive Ra0.8. The working efficiency as follows:

Compared with Ceramic insert ,The lifetime of the insert will be 7 times of ceramic insert when the same cutting speed is higher than ceramic insert .And the surface roughness is higher than ceramic insert .

Compared with Ceramic insert ,The lifetime of the insert will be 7 times of ceramic insert when the same cutting speed is higher than cermet insert .And the surface roughness is higher than cermet insert .

When hard turning the wind power bearing with working allowance above 2mm,the bearings manufacturer will choose Halnn Superhard BN-S20 CBN inserts ,When machining the channel part of the wind power bearing ,we can choose CNC Lathe for rough machining speed Vc=100~150m/min,the cutting speed ap=1~4mm, finish turning speed Vc=140~180m/min ,and the roughness can arrive Ra0.4.

Halnn Superhard Bn-S20 solid cbn insert hard turning all the parts of the wind power bearings :

When turning the cylinder of the wind power bearings, Halnn recommend you SNGN120712 CBN inserts;

When turning the end surface of wind power bearings, Halnn recommend you CNGN120412,CNGN120408 cbn inserts;

When turning the surface shoulder of the wind power bearings ,Halnn recommend you CNGN120412,CNGN120408 CBN inserts ;

When turning the channel part of the wind power bearings ,Halnn recommend you RNGN120400 and RNGM090300 CBN inserts.

Halnn superhard has researched new cbn inserts materials BN-S20 CBN Inserts to satisfy the manufacturers ,and if you have any problems on Bn-S20 CBN insert ,please feel free to contact with us halnntools@gmail.com ,skype:cbn_inserts_angels ,whatsapp:+8618695866134 ,Wechat:Halnntools.

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

The technology of Machining wind power bearing used CBN Cutting Tools

Bearing, as one of the most important part in machine machinist ,is the core components of the wind power machinery. Bearing is the weak part in the wind power machinery. Because of its harsh environment of wind power bearing ,installation and maintenance is not convenient ,so it will required more strictly on the quality of the wind power bearing materials and the processing lifetime. So in order to get better performance ,we make unremitting efforts,  select more suitable wind power materials, materials quality control and the processing technology of propose measures. Thus it not only has enough strength and load capacity, but also has a good service life, safe ,reliable, smooth running and lubrication, corrosion and good sealing performance.

At the beginning, the wind power bearing will make heat treatment after roughing, the hardness is too high to difficult to process, we often use grinding process as the final process. But with the continuous development of modern cutting tools industry, we developed new cutting tools which can be used turning Instead of grinding, it not only improve the processing efficiency, but also reduce the processing costs. In current times, the wind power bearing processing technology will be as follows:

Bearing raw materials-Roughing-Heat treatment-Finishing-Inspection-Antirust-Storage (or assembly of finished products). 

Following we will analysis  the wind power bearing processing technology.

Raw Materials of Bearing Steel ,Forging : Wind power bearing usually use 42CrMo4 as the main materials of the wind power, and it will be forming with forged technology, we should control the forging temperature, so that the particle will not too big .

Rough Machining: Machining the wind power bearing which made through forged process, because the large working allowance, we need to choose the most suitable cutting tools materials. We can choose carbide insert . If the work piece hardness is above HRC45,we can choose CBN Cutting tools ,especially Halnn BN-S20 CBN insert ,the cutting depth can arrive 7.5mm,Then leave some processing allowance for the finishing process.

Heat-treatment(Quenching and Tempering):It need heat treating on the wind power bearing after roughing process, we need improve the hardness of the work piece, wear resistance and impact resistance ,and obtain the good usage lifetime.  Quenching is to improve the hardness of the work piece, wear resistance and impact resistance. Tempering is to eliminate the stress produced when the steel pieces in the quenching process to improve the high hardness of the steel work piece and wear resistance, and the required plasticity and toughness.

When the wind power bearing wall thickness is not more than 12mm, the hardness after quenching will be above HRC63 (Rockwell hardness), hardness after tempering will between HRC 60-65. The hardness of work piece after tempering will be different according to customer requirements. The hardness value depending on the tempering hardness with normal quenching process.

Finishing Process: We make finishing process on the work piece which after heat treatment to obtain the dimension and the procession which the drawing required. At the beginning ,we use grinding process ,grinding can get high precision ,but the working efficiency are low ,and some bearing required not higher on the precision. With the development of modern technology, the requirements for the accuracy of Ra 0.8 ,the cbn cutting tools can meet the requirements.

At present, The cutting tools in the market include carbide insert ,ceramic insert and cubic boron nitride cutting tools. The hardness of the work piece usually is above HRC45 because it is through the lasering process after heat treatment . So we will not recommend that using carbide cutting tools ,ceramic insert can use finishing process, but it can not use interrupted turning process ,and it will easily chipping when meet the Inhomogeneous dimension surface . Wind power bearing belongs to large scale forged work piece, it will be easily change after heat treatment, so we will not recommend that using ceramic insert .Cubic Boron Nitride is the best materials for machining hardened steel .Especially Halnn superhard researched non-metal adhesive BN-S20 and BN-S200 CBN Cutting Tools (following figures),The machining effect are very good for machining wind power bearings.    

Halnn ,as the most famous cbn cutting tools brand in China ,specific to offer the best solutions for the customers. Halnn always devoted to researching new cbn cutting tools materials to satisfy the customers requirements and offer the customers best cbn cutting tools with high quality  and excellent performance. Since established, Accurate grasp of the pulse of the times change, with long-term training accumulated technical strength and the most cutting-edge technology development capabilities, Halnn enjoyed a high reputation on superhard cutting tools in the academic community.

Halnn superhard non-metal adhesive BN-S20 and BN-S200 CBN Cutting Tools belongs to solid CBN insert .BN-S200 mainly used for finishing process ,the cutting depth can be controlled within 0.5mm. But BN-S20 Cutting Tools can be used for both roughing and finishing process, for the wind power bearing which working allowance usually above 2mm.

Inspection: Make final Inspect on the wind power bearing ,testing the size and accuracy of the wind power bearing standards.

Antirust: Wind power bearing surface coated with a layer of rust-proof oil to prevent wind power bearing rust

Storage (or assembly of finished products): Put the wind power bearing in the storage, or directly into the wind power bearing assembly, assembled into finished products.

With the continuous development of modern technology, more and more difficult materials to process, along with the tool industry is also constantly developing new products, only continue to advance with the times, developed a high-efficiency low-cost tool materials or tool grades. If you are interested in blades for machining wind power bearings or blades for machining hardened steel, click on the hard steel working area.

More information on cbn cutting tools, please feel free to contact with us halnntools@gmail.com ,skype :cbn_inserts_angels ,whatsapp :+8618695866134, wechat :Halnntools