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The working principle of a brake disc
Release date:
2025-03-05
When the brake pedal is depressed, a lever mechanism at the pedal multiplies the braking force by a factor of three. This amplified force is then further multiplied by a hydraulic system, resulting in an even greater braking torque. The increased force pushes the piston, which in turn presses the brake shoes against the brake rotor, clamping it tightly. The intense friction generated between the brake shoes and the rotor slows the vehicle down.
Machining requirements for brake discs
Brake discs are a critical component of the braking system; high-quality discs deliver stable braking, operate quietly, and remain free from vibration. Consequently, they demand stringent manufacturing tolerances, as follows:
Brake discs are cast products, and their surfaces must be free of casting defects such as sand holes and porosity to ensure the disc’s strength and stiffness and prevent unexpected failure under external loads.
When a disc brake is applied, it relies on two braking surfaces; therefore, high precision is required for these surfaces, and positional accuracy must also be ensured.
Braking generates high temperatures, so the brake disc should be designed with cooling channels in its center to facilitate heat dissipation.
The hole at the center of the brake disc serves as the primary datum for assembly. Consequently, the machining of this hole is of critical importance; currently, it is typically performed using cutting tools made from Hualing’s ultra‑hard BN‑S30 material.
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