Cutting tools for automotive brake disc processing applications

As is known to all, most of the current family car brake using disk brake, that is, the use of brake disc brake. Different from the drum brake, the disc brake has good heat dissipation performance and is not easy to produce thermal recession in the high-speed braking state, so the disc brake is welcomed by automobile manufacturers and the majority of users.

Normally, the brake discs should be replaced every 60,000 to 80,000 kilometers. The brake disc is a wearing part in the brake system of the automobile. With the increase of the mileage of the automobile, the brake disc will be constantly worn. When the brake disc is worn to a certain extent, it needs to be replaced. The annual replacement of brake disc and processing demand increases with the increase of car ownership, its own processing is not difficult, but how to ensure its surface quality and dimensional accuracy at the same time, so that the cutting more efficient, improve the efficiency of production, largely depends on the choice of tools.

The common brake disc is made of HT250 and consists of three main elements (proportion) : C: 3.1-3.4Si: 1.9-2.3Mn :0.6-0.9. Mechanical property requirements: tensile strength >=206MPa, bending strength >=1000MPa, deflection >=5.1mm, hardness requirements between 187-241Hb. The processing of this kind of material has put forward a very high requirement for the wear resistance of the processing tool. Considering the actual braking effect, the surface finish of the brake disc processing does not need to be too high, generally reaching Ra3.2μm.

In view of the above common processing situation, Weishi customized CBN tool material, relative to cemented carbide, CBN material in processing efficiency, tool life and parts of the quality and size can have a very big advantage; And compared with other brands of CBN tools, visa knife has a very high cost performance and stability, and provides the corresponding grinding service, can effectively reduce the use of customer cost and single processing cost.

Our cutting tool in a customer test, customer using horizontal lathe processing brake disc, its material is HT250, workpiece hardness HRC30 or so, processing inner hole diameter D140, processing outer circle diameter D280, processing surface requirements Ra3.2μm.

Our company uses CNMX120416 customized CBN material blade to compare with our competitors, respectively processing the outer circle and end face of the brake disc, as well as the inner hole and end face. Under the same parameter conditions (as shown in the table), the CBN tool life is longer than that of an imported brand, and the cost performance advantage is obvious. And CBN tool for gray iron materials can achieve linear speed higher than the conventional carbide tool, can achieve a higher efficiency beat, but also to ensure the maximum size accuracy and surface quality of parts. Excellent product quality is the cornerstone of Weishi to win the recognition and trust of customers, we will continue to improve and develop more good products for customer service!