Hard Machining bearing ring PCBN inserts from Halnn superhard Materials 

First ,we need know something about Hard turning bearing ring 
technology,Halnn superhard Materials Co.Ltd will show you as follows:
 

a.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;
b.Turn to another face for turning
c.Step 1: Turning the upper end surface (inside the channel); 
  Step 2:convert  the work piece platen, then turning the upper end surface.
（outside the channel） 
d.Hard turning the spherical channel(Halnn superhard CBN spherical inserts 
),the channel bottom range will less than 0.005 mm after hard turning ,the 
channel surface roughness will be Ra 0.3μm
e.Finish turning inner diameter of the shaft washer.
 

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

The following is application Case:Hard turning the wind power bearing ring

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

Machine: CNC Vertical Lathe
Cutting Inserts Grade: Halnn superhard BN-S20
Work piece Dimension: Outer diameter φ1900 mm，Thickness 130 mm，
Roughness after finish turning：The channel bottom range of double peach 
channel after finish turning all less than 0.005 mm ,and the channel surface 
roughness will reach Ra 0.3μm. 

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 quenching ,the grinding time is above 18 h, but use 
the turning instead of grinding process,just need 4.5 h.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.

Halnn superhard Materials Co.,Ltd is a professional manufacturer of CBN 
Cutting Tools,and we are always devoted to researching new type cbn inserts 
to satisfy the customers requirements. Halnn will serve the best service and 
good quality products .

Related Video,https://www.youtube.com/watch?v=3uLOVm-wlIs.Any question ,you can contact with us halnntools@gmail.com 
.skype:cbn_inserts_angels