Brake disc is one of the key parts of automobile braking system. Its precision and quality are the premise to ensure the safety of automobile driving. Therefore, it is a very important 

problem to choose the right cbn cutting tool such as solid cbn inserts with dimple, SCGN0904, SNGN1204, SNEX120412ZZ, etc to improve the processing quality and efficiency when 

machining the brake disc.

The difficulties in brake disc turning:

1) The original brake disc casting material is generally HT200, but with the increase of vehicle speed and power, there are higher requirements for the casting material: the material 

is required to meet or exceed the HT250 standard, and the body hardness is above 180hbs. Therefore, there are higher requirements for the hardness of machine tools.

2) Brake disc is a typical disc thin-walled part, the main processing content is turning and drilling process, how to ensure the finished product size and shape and position accuracy 

is a challenge for traditional cutting tools.

3) The machining quality of the two end surfaces of the brake disc is very strict, and the surface roughness should be less than Ra1.6. Using the traditional cemented carbide tools, 

not only the surface roughness is not easy to reach Ra1.6, but also the tool durability is low, and the productivity can not be improved.

At present, CBN insert is the best choice for machining brake disc. CBN tool has high hardness and wear resistance, and the friction coefficient between CBN tool and different materials

is small (0.1 ~ 0.3). It can not only obtain satisfactory surface processing quality, improve production efficiency, but also reduce processing cost, which has significant economic benefits.