Brake block is a rigid moulded friction material, grey-black in colour, having a random fibre asbestos base and containing metallic particles. It is manufactured only in the form of brake blocks, integrally moulded to a back plate. This material was originally developed to have the ability to withstand the heavy braking demands of Electric Multiple Unit (EMU) stock, operating suburban passenger services. Its use has since been extended to a range of duties from low speed shunting locomotives to high speed passenger trains.
Brake block has a higher and more stable coefficient of friction than the conventional cast iron block which it replaces, resulting in lower application forces and permitting the use of smaller cylinders. It is a conformable block designed to eliminate thermal cracking of tyres, which had hitherto been a barrier to the widespread use of composition blocks. Brake block has several fold advantages in life over cast iron blocks and thus significantly lengthens service periods. It is particularly beneficial in those situations where hot cast iron dust would present a safety hazard. Spark-free blocks are essential in oil refineries, chemical works and ordinance factories. The composition block has much to offer in the braking of passenger rail, minimising braking shocks by its smoother action and permitting higher load/tare factor.
Shanghai Bosheng Industries Co., Ltd pays great attention to quality control and management. Our A55 Crane Rail is completely controlled by iso9001-2008 quality system, and we have obtained the production license of railway products from The Ministry of Railways of China. We have a full set of testing equipment to ensure that all of our rail products meet customer requirements.
Shanghai Bosheng Industries Co., Ltd is an ISO 9001/2008 certified company. All processes are in accordance with the requirements of ISO quality management system, from supplier quality control to finished products, we are in accordance with the standard procedures, we have strict quality control system for suppliers:
1. Before producing A55 Crane Rail, we will check and test the raw materials. we require suppliers to provide production batch number, chemical composition, mechanical properties and other testing indicators.
2. Our quality control inspectors take sample sampling and batch testing after the process of manufacturing A55 Crane Rail, and provide raw material certificate and other means to control the testing process.
3.According to the different requirements of A55 Crane Rail, we make the corresponding physical and chemical testing and inspection. If the results do not meet our requirements, we will refuse to accept the materials only if they meet our standards.
4. For semi-finished products and their external suppliers of A55 Crane Rail, we often organize quality control coordination meetings and provide technical advice and guidance. Ensure that qualified products are delivered to our customers prior to shipment.
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