Halnn release Hard turning bearing rings CBN inserts BN-S20

Hard turning bearing ring technology:

Step 1:Finish turning the base level end, the base level end will be less than 0.005 mm after finish turning ,then turning the outer diameter of the shaft washer;

Step 2:Turn to another face for turning

Step 3:Turning the upper end surface (inside the channel); convert  the workpiece platen, then turning the upper end surface.（outside the channel）

Step 4:Hard turning the spherical channel (Halnn superhard CBN spherical inserts ), the channel bottom range will less than 0.005mm after hard turning ,the channel surface roughness will be Ra0.3μm

Step 5:Finish turning inner diameter of the shaft washer.

With above technology ,the wall thickness difference of the push ball bearing ring will less than 0.01mm,which is more than the precision value of P5 grade bearing .

Application Case 1：Hard turning wind power bearing ring.

Machining Targets: variable pitch bearing ring used for 1.5MW wind power machine sets.

Machine:CNC Vertical Lathe

Cutting Inserts Grade:Halnn superhard BN-S20 CBN inserts

Workpiece Dimension: Outer diameter φ1900mm，Thickness 130mm，

Roughness after finish turning：The channel bottom range of double peach channel after finish turning all less than 0.005mm ,and the channel surface roughness will reach Ra0.3μm.

Application Case 2: Turning the bevel of the Precision angular contact bearing ring 

Machining Targets : Precision angular contact bearing

Cutting Inserts Grade:Halnn superhard BN-H20

Inserts Lifetime:Machining about 1000 sets /cutting edge; smooth finish≤Ra0.4

Advantages of hard turning the bearing ring

 1.High working efficiency

For example, like variable pitch bearing ring which is used for machining wind power 1.5 MW machining sets in bearing industry.If grinding machining all the allowance after queching ,the grinding time is above 18 h, but use the turning instead of grinding process,just need 4.5h .At the same machining precision,the turning machining efficiency is 4 times than grinding machining .

2.Low cost

For example , like turning the 1900 variable pitch bearing ring ，use Halnn superhard BN-S20 grade solid CBN inserts can finish turning more than 30 piece bearing ring.

3.Reduce pollution

Compared with the grinding iron grain with the turning iron scraps, it will be more convenient to deal with the iron scraps ,and the irons scraps cost lower as resource ,also reduce the pollution .

Conclusion

When turning the large-scare and high-precision bearings,using hard turning technology (used turning instead of grinding process) has become a trender in bearing industry .This technology has high machining effiency ,low cost ,traditional technology can not contend with it .As BN-S20. BN-H20 grade superhard inserts enter into the market , the smooth finish and reliability which use turning instead of grinding process become better ,and the inserts cost become lower .

More information,http://www.halnntools.com/pro,Or contact with us halnntools@gmail.com,whatsapp:+8615036165377,skype:cbn_inserts_angels