CBN tools machining bearings for higher surface roughness
The bearing is an important component that supports the rotation of mechanical equipment. The main function is to support
the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotationaccuracy. Common
materials are GCr15, GCr15SiMn, 50Mn, 42CrMo, 5CrMnMo and the like.
The hardness of the bearing after heat treatment is generally above HRC45, and the individual requirements are above HRC60.
The processing of such bearings is very demanding on machine tools and tools, especially in the case of high dimensional
accuracy and surface finish requirements. The wear resistance, impact toughness and fracture resistance are required to be high.
For the bearing industry, Halnn has developed BN-S20 grades, BN-S200 grades and BN-H11 grades of three CBN tools for
roughing, semi-finishing and finishing machining bearings, respectively. In addition, increase production efficiency and reduce
production costs.
Among them, BN-S20 and BN-S200 belong to the non-metallic adhesive solid CBN tools, with strong impact toughness and large
allowance for cutting bearings, and BN-H11 belong to the brazed CBN tools, which is mainlyused in the finishing process, and
the cutting depth is controlled within 0.3mm.
The cutting parameters are as follows:
|
Workpieces Material: bearings (hardness: 45HRC) |
|
Rough machining |
Finishing |
|
Halnn CBN tools BN-S20 |
Halnn CBN tools BN-S20,BN-S200,BN-H11 |
|
Cutting speed(Vc)=50-150m/min |
Cutting speed(Vc)=60-250 m/min |
|
Cutting depth(ap)=1-10 mm |
Cutting depth(ap)≤1mm |
|
Feed rate(Fr)=0.15-0.7mm/r |
Feed rate(Fr)=0.05-0.35 mm/r |
Specific cases are as follows:
|
Halnn BN-H11grade CBN tools machining bearings |
 |
Processing procedure: Finish machining
Workpieces hardness:HRC62
Tool type:BN-H11 DNGA 150408
Cutting parameters :Cutting speed(Vc)=140m/min
Feed rate(Fr)=0.12mm/r
Cutting depth(ap)=1mm |
|
Tool materials |
Cutting speed |
Tool life |
Surface roughness |
|
Halnn BN-H11 |
140m/min |
12pcs/edge |
Ra0.8 |
|
A brand of ceramic tool |
140m/min |
10pcs/edge |
Ra0.8 |
|
Halnn BN-S200 grade CBN tools machining bearings |
 |
Processing procedure: Finish machining
workpiece material:42CrMo
Tool type:BN-S200 RCMX 090700
Cutting parameters :Cutting speed(Vc)=110m/min
Feed rate(Fr)=0.45mm/r
Cutting depth(ap)=0.5mm |
|
Tool materials |
Cutting speed |
Tool life |
Surface roughness |
|
Halnn BN-S200 |
110m/min |
8pcs/edge |
Ra0.8 |
|
A brand of ceramic tool |
90m/min |
1pcs/edge |
Ra1.6 |
Note: when using Halnn CBN tools to hard turning bearing, try to use dry cutting processing method, but sometimes for bearing
processing accuracy and surface quality and tool life has special requirements, but also can use water-based cutting fluid for
continuous, uniform cooling method, to avoid micro-cracks on the CBN tool.