2023/07/27
Material composition of wet paper-based friction plate
Wet paper-based friction plate is also a kind of polymer composite material made of fiber reinforced material, organic binder and friction property regulator through specific production process. Its embryo body usually uses raw paper, so it is called "paper base". 1) Fiber reinforced materials Wet paper-based friction plate fiber reinforced materials include glass fiber, aramid fiber, carbon fiber and other materials. Glass fiber is wear-resistant and cost-effective, and is mostly used in wet paper-based friction sheets for after-sales service market. Aramid fiber is resistant to high temperature, wear-resistant, efficient and stable in torsion transmission. Carbon fiber is a fibrous material formed by high temperature heating of organic fiber or low molecular hydrocarbon gas raw materials. It has high carbon content and many advantages, but the production process is complicated and the cost is high. The wear performance of wet paper-based friction sheet, with the different composition and content of reinforcing fiber, the wet paper-based friction plate of light-duty automobile usually uses a single fiber, while the wet paper-based friction plate of high-speed heavy-duty automobile or construction machinery usually uses composite fiber.
2023/07/27
The influence of the brake pads after wading on the braking effect
For rainy days, we will ask to slow down when driving. This is not only because the line of sight is affected in rainy days, but also because the brake pads will have different degrees of influence after wading. 1. The residual moisture will make the brake disc and brake pads unable to fully rub, causing the car to lose its braking force; 2. The water on the road on rainy days is dirty, and there will be various sundries. When the vehicle is wading, these sundries are easy to adhere to the chassis gap, which will make the chassis rust for a long time; 3. When the vehicle is wading, the accumulated water is poured into the lights, forming water mist in the lights, which affects the transmission effect of the light and has a direct impact on driving safety;
2023/07/26
The service life of automobile friction plate
How long can a car friction plate usually last? The main factors for the service life of automobile friction blocks and friction plates include hardness, strength, and wear of friction materials. Under normal circumstances, the service life of the front brake friction pad/friction plate is 30000km, and the service life of the rear brake friction pad/friction plate is 120000km. Is the harder the surface of the car friction plate, the longer the service life? In fact, there is no corresponding relationship between the service life of the automobile friction plate and the surface hardness. However, if the surface hardness is high, the actual contact area between the brake friction plate and the brake disc is small, which usually directly affects the service life.
2023/07/26
Development history of friction materials
Friction materials can be roughly divided into the following stages: (1) Before 1930, asbestos long fibers were mainly added with other thread weaving impregnation methods. (2) In 1930, a flexible resin adhesive was developed, which has good thermal stability, making it possible to mix more fillers in the dry process, and developed drum brake pads. In the following 30 years, asbestos raw materials still dominate. (3) In 1950, the American SKELLMAN Company took the lead in developing friction materials with iron powder, graphite and other fillers and resins as adhesives for hot pressing, that is, semi-metallic friction materials. In 1970, semi-metallic friction materials were used in disc brakes and are still widely used today