Event Details

  • High-strength chains are widely used in various types of mechanical transmission structures, especially in mechanical transmissions such as automobiles and motorcycles, which require high tensile, wear and corrosion resistance. Due to the structure of the high-strength chain (the links are connected by hinges) and the load during operation (with tight and loose edges), the normal failure mode of the transmission high-strength chain is the fatigue failure and high of the high-strength chain parts. The elongation of the strength chain.

    At present, the quality of high-strength chain parts in China chain factory https://www.getechain.com/ has been greatly improved compared with the 1970s and 1980s. Most of the high-strength chains produced by professional high-strength chain manufacturers with a certain scale have interchangeable sizes. Indicators such as static strength have reached the corresponding standard requirements. However, important quality indicators such as fatigue resistance and wear resistance of high-strength chains are still unsatisfactory. There are many reasons for this, which are closely related to the selection of materials for high-strength chain parts and heat treatment processes.

    1. The status of material selection

    The high-strength chain is divided into a roller joint and a sleeve chain according to its structure, and is composed of an inner chain plate, an outer chain plate, a sleeve, a roller, and a lock piece. At present, domestic and foreign manufacturers differ in the choice of materials:

    (1) The inner chain plate of the high-strength chain part is fixed together with the sleeve, the outer link plate and the pin shaft, and the pin shaft and the sleeve are a clearance fit. The fit between the high-strength chain parts has a great influence on the wear resistance and minimum tensile load of the high-strength chain. According to the use of high-strength chain and the damage load, it is divided into three levels: A, B and C. Class A is used for heavy-duty, high-speed and important transmissions; Class B is used for general transmission; Class C is for general purpose. Therefore, the coordination requirements between Class A high-strength chain parts are strict.

    (2) Foreign manufacturers generally use S35C and SAEl035, adopt advanced continuous mesh belt carburizing furnace, heat treatment in the heating process with protective atmosphere for carbon treatment, and strict on-site process control, so the chain plate rarely occurs. After quenching and tempering, brittle fracture or low surface hardness occurs.

    (3) Due to the continuous improvement of the requirements for high-strength chain parts, domestic and foreign manufacturers continue to improve the steel used for pins, sleeves and rollers. The minimum tensile load, especially the wear resistance of high-strength chains, is related to steel. Domestic and foreign manufacturers have recently used 20CrMnTiH steel instead of 20CrMnMo as the pin material, and the tensile load of high-strength chain has increased by 13%-18%. The material used by foreign manufacturers for SAE8620 steel as pin and sleeve is also related. It has been proved by practice that the wear resistance and tensile load of the high-strength chain can be greatly improved only by improving the matching clearance between the pin shaft and the sleeve, improving the heat treatment process and lubrication.

    (4) The steel selected for high-strength chain parts at home and abroad is mainly distinguished between the inner and outer chain plates. The performance of the chain plate requires high tensile strength and certain toughness. Domestically, 40Mn and 45Mn are generally used, and 35 steel is rarely used. The chemical composition of 40Mn and 45Mn steel plates is wider than that of foreign S35C and SAEl035 steels, and the surface layer has decarburization of 1.5%-2.5% thickness. Therefore, the chain plate often has brittle fracture after quenching and sufficient tempering.

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  • 2/4/20 at 1:00 AM -
    2/12/20 at 1:00 AM
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