Brake disc basic information
As the main component of the car, the brake disc is a powerful guarantee for safe driving. With the continuous updating
of the automotive industry, higher requirements are placed on the tools for machining brake discs.
As the main components on the car, the brake disc itself has high dimensional tolerance requirements and precision
requirements: if the tolerance of the two brake surfaces is within 0.009 mm, the surface roughness reaches Ra1.6, the
parallelism requirement is within 0.04 mm, and the beating requirements within 0.025mm. At this time, the BNK30 grade
CBN insert is used to process the brake disc, which not only improves production efficiency, but also ensures high surface
quality.
Advantages of BNK30 grade CBN inserts processing brake disc
(1) BNK30 grades have high hardness and good wear resistance, which is 15 times to 20 times that of cemented carbide tools.
(2) Can withstand high-speed cutting, the highest line speed can reach 2000m / min, improve production efficiency
(3) The CBN tool adopts the method of dry cutting. It does not add cutting fluid, and the chip is easy to be recycled, which
is more in line with “green manufacturing”.
Cutting parameters of BNK30 grade CBN inserts machining brake disc
BNK30 grades are brazed CBN inserts with multiple cutting edges. At the same time, according to customer requirements, solid
CBN inserts can be made for roughing. Below is the range of cutting parameters for BNK30 graded brake discs.
Machining workpiece
|
Cutting speed
Vc（m/min）
|
Cutting depth
Ap (mm)
|
Feed rate
Fr（mm/r）
|
CBN inserts grade
|
brake disc
|
200-700
(Roughing)
|
1-10
|
0.2-1
|
BNK30
|
300-2000
(Finishing)
|
≤1
|
0.05-0.3
|
BNK30
|
Case parameters of BNK30 grade CBN inserts processing brake disc
Processing the same brake disc cutting parameters comparison
|
Workpiece material:HT250（FC250）
Workpiece hardness: HB 180-24
Workpiece diameter:Φ434
Surface finish：Ra1.6
|
Tool material
|
Cutting speed
Vc（m/min）
|
Cutting depth
Ap (mm)
|
Feed rate
Fr（mm/r）
|
Tool life
(pcs) |
|
A company CBN inserts |
681 |
1.0 |
1 |
100 |
|
Halnn BNK30 |
681 |
1.0 |
1 |
145↑ |
Extended reading: For the brake disc, in addition to the BNK30 grade, there are other materials CBN inserts can be processed,
as shown in the following table:
Inserts grade
|
Processing
|
Application advantage
|
Inserts image |
BN-S30 |
Roughing |
Both thermal shock resistance and wear resistance
|
|
BN-S300 |
Roughing, Finishing |
Excellent sharpness for high surface finish.
|
BN-K20 |
Finishing |
More flexible blade clamping method, multi-edge number;
excellent wear resistance
|
 |