This issue of automobile brake pad manufacturers introduces the core part of automobile disc brakes, brake pads. It is installed on the wheel of a car. The disc brake applies pressure to the brake caliper through the hydraulic system, thereby generating brake pads and brake pads that rotate with the wheels. To achieve the purpose of braking friction, in order to ensure the comfort of braking, the brake pads should be stable, no noise and no jitter. Brake pads need to have high thickness uniformity, and have special requirements for brake surface runout, parallelism and surface roughness.

Status of production technology: There are many types of brake pads, which are characterized by thin walls. The brake pads and the center are formed by sand cores. Different types of brake pads have differences in disc diameter, disc thickness and the size of the gap between two discs, and the thickness and height of the disc hub are also different. The structure of a single-layer brake pad is relatively simple. The weight of the casting is usually 6-18 kg.

There are screw mounting holes on the convex surface of the brake pad, which can be connected with the car wheel. The double-sided disc has two friction surfaces. When the car is braking, the braking surface of the brake pad cooperates with the friction pad to generate braking torque. In order to ensure the comfort of braking, the brake pads need to have high thickness uniformity, the bounce of the end face of the brake surface, the parallelism of the end face of the brake surface and the surface roughness of the brake surface.

Brake pads can be divided into single-sided discs, double-sided discs, high-performance discs, bearing discs, etc. according to their structure. The blank of the brake pad is a casting. Machining requires the inner, outer circle and end surface of the brake pad, and drills on the convex surface to connect the threaded hole and chamfer. High-performance brake pads also need to drill holes on the brake surface and knock some brake pads. The processing environment of the brake pads is harsh, dusty and the cutting volume is large. The machine tool is required to have good protection and lubrication functions. The machine tool is required to maintain machining accuracy for a long time under high torque. The machine tool is required to have good rigidity and precision retention.

The brake pad blanks are castings. End turning, external turning, internal turning and drilling must be completed. For finishing, two turning tools are used to machine two brake pads at the same time to ensure the parallelism of the two brake surfaces. Generally, it is divided into two turning sequences and one drilling sequence. The turning sequence is processed by two lathes. One of the lathes is equipped with dual turning tools with clamping tools, and the drilling sequence is completed in the vertical machining center. The above process can meet the requirements of machining accuracy and surface roughness, but according to the requirements of the brake pad brand, it is necessary to grind some discs on the grinder.

Technical requirements: The outer contours of the castings have been processed, and there should be no shrinkage, pores, blisters and other casting defects after finishing. The metallographic structure is medium flake-like, graphite-like, uniform structure, and low cross-sectional sensitivity. Most domestic manufacturers use clay sand wet molds, manual template molds and grease sand cores. Some manufacturers or individual casting varieties use tree-coated sand hot box technology, while some manufacturers produce automotive brake pads on the molding line.