Dressing common sense: on the crusher wearing parts of the study – mineral proce
Impact Crusher is a common mineral processing equipment, convenient operation, high efficiency. However, many users complained that this machine easily damaged, seriously affecting the processing operations. Let the following Zhengzhou Xinhai Machinery Manufacture Co., Ltd. technical staff introduce crusher wearing parts.
Crusher is imported from VAI crusher broken super-hard materials, wear parts to replace imports, this paper developed a CYK-type high chromium alloy cast iron, produced by the research and on-site assessment, can replace imported parts, made significant economic benefits.
1, crusher wearing parts of the operating conditions and material selection
1.1, working conditions Wuqiangxi hydropower projects made use of quartzite and quartz sandstone, aggregates, and then the preparation of concrete. The two gravel compound SIO. Content of 75% to 90%, more than 7 Mohs hardness, compressive strength 200-300MPa. Introduction of the breakers technical parameters: rotor diameter of 1000 × width 1000mm, speed 740r/min, power 160kw, the maximum feed size is 150mm, crushing capacity of 120t / h. Equipment were brought by on-site production of consumable assessment, service life of 110-125h. Wearing parts in the operation of another condition characterized by: the impact of high speed and high hardness of quartzite hammer repeated collision, impact hammer work surface temperature of up to 500-600 , therefore, anti-wear material must be at a higher temperature under sufficient toughness and hardness.
1.2, Wear Mechanism Nori Chong crusher in the impact hammer, and other wearing parts counter the wear plate is drilled cutting type abrasive wear. This wear surface strain and mechanical strain is a strong groove wear, groove formation is due to Abrasive Under the external force to a certain speed cut into the metal substrate, by a slip from the post and base metal, thereby leaving a matrix of grooves. The formation of grooves depending on the size of the local stress and the metal surface and the relative value of abrasive hardness. Stress in the same circumstances, abrasive hardness, the more prone to groove. As the sand sparkle stone hardness and therefore the metal matrix is often produced in the worn grooves dominate.
1.3, material selection To learn from foreign experience, first of all we VAI imports residues of microstructure, mechanical properties and chemical composition analysis of test results show that imports of parts used in anti-wear materials, high alloy material, the chemical components shown in Table 1, the microstructure of martensite block section plus a second carbide carbide, hardness HRC62 ~ 64. We wear common use of materials at home and abroad carried out extensive research and in-kind analysis, based on this under the crusher working principle and domestic resources, a lot of material testing, used CYK-type high-chromium alloy cast iron to carry out trial.
2, crusher wear parts in the development of
2.1, L melting process
CYK High alloy cast iron within the medium frequency induction furnace melting, melting temperature is 1500 ~ 1550 , to ensure the alloy melt, and the full spread, in order to prevent Casting of coarse grains or appear cold shut, wrinkled skin defects such as, casting temperature control in the 1360 ~ 1380 .
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