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Heavy-duty truck gear before(Hits:) 
Origin Author Add Time2015-10-17
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      Our heavy-duty truck gear steel grades more, mainly to adapt to the introduction of foreign advanced automotive technology at the time of request. 1950s from the former Soviet Union country to introduce the Soviet car factory Lihaqiaofu medium truck (ie "Liberation" brand the original model) production technology, but also the introduction of the former Soviet Union 20CrMnTi steel production of automotive gears.
      After the reform and opening up, with the rapid development of China's economic construction, in order to meet the rapid development of China's transportation needs, from the 1980s, China has planned to introduce various types of advanced models of industrial countries, all kinds of foreign advanced in heavy-duty automotive goods also continue to introduce. Meanwhile, China's largest car plant with foreign famous automobile big companies to cooperate, the introduction of foreign advanced automotive production technologies, including automotive gear production technology. At the same time, China's iron and steel smelting technology level is rising, the use of ladles and secondary metallurgy and continuous casting and rolling trim components and other advanced smelting technology, making the mills can produce high-purity, hardenability performance with coarctation gear steel, enabling the introduction of the automobile gear steel localization, so that our gear steel production levels to a new level. In recent years, China's national conditions suitable for the domestic heavy-duty vehicles gear nickel high quenching properties of steel has also been developed and applied, and achieved good results with. Heat treatment technology car gears from original 50 - Support the development of the use of pit gas carburizing the 1960s to the current widely used computer-controlled continuous gas carburizing automatic line and box-type multi-purpose furnace and automatic production line (including a low pressure (vacuum) carburization technology), gear carburizing pre-oxidation treatment technology, gear quenching controlled cooling technology (due to the use of special quenching oils and quenching techniques), gear blank forging isothermal normalizing technology. These techniques not only makes gear carburizing distortion has been effectively controlled, gear machining accuracy is improved, service life has been extended, but also to meet the needs of modern mass production gear heat.
      Related literature that life consists of two main automobile gear indicator assessment, first contact fatigue strength of the gear, and second bending fatigue strength of the gear. The former is mainly determined by the carburizing quality, which is mainly determined by the gear material. For this reason, it is necessary to use automotive gear carburizing steel requirements, performance characteristics and heat treatment have a more comprehensive understanding.
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