The shape of parts is a very important factor affecting the deformation size and deformation trend of heat treatment, which is unanimously recognized. If the shape of the part is complex, the shrinkage (or increase) of different sections during heat treatment is uneven, resulting in the deformation and uncontrollability...
Compared with similar products in advanced countries, the quality of truck gears in China lags far behind, with an average service life of only about half, high energy consumption per unit product and low labor productivity. In order to improve the quality of truck gears, in addition to appropriate...
Carburizing and quenching of truck gears is a key process in the process of gear quality control. Many key characteristics of truck gear need to be realized through this final heat treatment. The quality of heat treatment directly affects the tooth surface meshing and service life of truck gear....
The research on heat treatment deformation control of heavy truck gearbox gear is of great practical significance and great practical value. (1) The material selection of the gear box of heavy-duty truck requires the hardenability to ensure that the tooth surface and center of the truck gear get the...
At present, foreign automobile manufacturers generally adopt isothermal annealing treatment for truck gear forging blank, and specify different isothermal annealing processes for different materials. For example, Volkswagen adopts isothermal annealing treatment of deformation waste heat, i.e. by treatment, and the forging blank of higher alloy truck gear is treated...
As we all know, the quality of gears is influenced not only by the steel itself, but also by the heat treatment process to a great extent. The heat treatment process mentioned here not only refers to the carburizing and quenching process of gear, but also includes the heat...
Foreign tests have proved that the supercooled austenite decomposition products during surface quenching of carburized steel are the main reason to reduce the fatigue resistance of truck gears, and internal oxidation just promotes this process. In order to reduce the effect of internal oxidation The content of Cr...
China’s truck gear steel basically follows the brand of the former Soviet Union. For a long time in the past, 20CrMnTi dominated the world. China’s truck gear not only has a single brand, but also has large fluctuations in steel composition, wide hardenability bandwidth and many inclusions, resulting in...
1. Test purpose Our company adopts high-grade and high-quality zocrmntih steel with 6 bandwidths according to the steel factory standard. According to the performance requirements of different parts, we select 20CrMnTiHA2, 20CrMnTiHA3 and 20CrMnTiHA4, which are respectively applied to the synchronizer part – two speed gear sleeve (representative of...
1. Introduction to truck gear processing The cold working routes of the three parts are basically the same: forging – pre heat treatment – rough and finish machining – carburizing quenching and tempering – shot blasting – a small amount of grinding. The pre heat treatment of the first...