Cast iron has been the standard brake material for railroads for the past century. However, since the 1960s, cast iron has faced severe challenges in certain applications. High-phosphorus cast iron materials are mainly used in passenger trucks with speeds of 120km/h or higher. Take Japan as an example. In Japan, cast iron brake shoes have been used since the opening of railways, and they remained basically unchanged until the post-war period. After 1958, synthetic brake shoes made of organic materials such as phenolic resin began to appear. Compared with synthetic brake shoes, the original cast iron brake shoes were eventually eliminated due to their characteristics of high wear, low friction coefficient, and heavy weight. Compared with cast iron brake shoes, the main advantages of synthetic brake shoes are: 1. Synthetic brake shoes are light in weight. With the same dimensions, the weight of cast iron brake shoes is three times that of synthetic brake shoes. The use of synthetic brake shoes is easy to carry and install, which greatly reduces labor intensity. 2. The synthetic brake shoe has a long service life. Compared with cast iron brake shoes, synthetic brake shoes have better wear resistance and longer service life, about 5-7 times that of cast iron brake shoes. 3. The synthetic brake shoe has good safety and no sparks during braking. By using synthetic brake shoes, contamination caused by abrasive iron powder and fire accidents caused by sparks ejected from the brake can be effectively avoided. There is little or no abrasion iron powder flying when the synthetic brake shoe is braking, thus preventing fire accidents and reducing adverse effects on vehicles. 4. Reduce wheel and rail damage. The synthetic brake shoe has no grooves during use, causing very little damage to the wheels and rails, extending the service life of the wheels and rails. 5. Low noise. Synthetic brake shoes make no harsh or sharp noises during use. Especially when traveling through urban areas, there is less noise. After more than ten years of successful application in different countries and regions, the low-friction synthetic brake shoes independently developed by our company fully meet the needs of customers without causing any changes to the braking system or the braking pressure when converting buses and trucks. It directly replaces the existing cast iron brake shoe, has stable friction performance, and has been widely praised by customers.
NVH is the abbreviation of the three English words Noise, Vibration and Harshness. It is the general term for various indicators of automobile noise, vibration and comfort. The purpose of NVH work is to reduce vibration and noise in the car and create a comfortable driving or riding environment (auditory, tactile and visual). Therefore, some people call NVH work silent engineering.
Air braking is one of the braking methods of railway rolling stock. It uses compressed air as the driving force for braking, and controls the braking of the train by changing the pressure of the compressed air. Among the air braking methods, high-speed trains now generally use disc brakes. Air brakes are mechanical brakes and will suffer mechanical wear. The common structural form of air brake is disc brake, which uses compressed air to make the brake pads or brake shoes hug the brake disc, thereby generating braking force. Brake pads and brake shoes require strong friction, and their materials include organic materials, sintered materials and flexible materials. Disc brakes are divided into two categories. Wheel disc brakes have the brake disc attached to the side of the wheel, and axle disc brakes have the brake disc independently installed on the axle. Wheel disc brakes are commonly used on motor vehicles, and axle disc brakes are commonly used on trailers. Disc brakes can reduce mechanical wear on the wheel tread, making braking smooth and almost noise-free. The wheel tread is the contact surface of the wheel with the track.
1. Production quality control Establish management procedures for the stable production of qualified products, do a good job in quality assurance and prevention at every link, and conduct comprehensive control over factors that affect product quality, such as reasonably arranging time, strengthening process management, and organizing technical inspections work, strengthen technical guidance and training, strengthen operation management, grasp quality trends, and strengthen the management of non-conforming products, etc. 2. Contents of product traceability 1. Raw material traceability: Trace the source of raw materials, including raw material suppliers, origin, production batches and other information. This ensures the quality and safety of raw materials. 2. Production process traceability: Enterprises need to trace the production process of products, including production processes, equipment usage, operators and other information. This ensures compliance and traceability of products during production. 3. Warehousing and transportation traceability: Trace the warehousing and transportation process of products, including warehouse management, transportation methods and other information. This ensures product quality and safety during storage and transportation. 4. Sales channel tracing: Enterprises need to trace the sales channels of products, including dealers, retailers and other information. This ensures compliance and traceability of products during the sales process. 5. After-sales service traceability: Enterprises should trace the after-sales service status of products, including customer complaints, product returns and exchanges, and other information. This allows for timely handling of customer complaints and improvement of product quality and service.
