At 25 ℃ and 0.001 V / s scanning speed, the Tafel curve of automobile gear test material 20mncr5 steel after normalizing and isothermal annealing is shown in the figure. It can be seen from the figure that the corrosion potential of the material after normalizing treatment in 0.6mol/l...
The 72 h salt spray corrosion surface morphology of 20mncr5 steel, an automobile gear test material after normalizing and isothermal annealing, is shown in Figure. It can be seen that after 72 h salt spray corrosion, a large number of corrosion points appear on the surface of 20mncr5 steel,...
1. Material preparation The automobile gear steel 20mncr5, which is widely used, is selected as the experimental material. The energy dispersion X-ray fluorescence analyzer is used to analyze the composition of the prepared test material. The results are shown in Table 1, which meets the composition design requirements of...
Spiral bevel gears are widely used in mechanical transmission systems with intersecting or staggered shafts, and their tooth surface accuracy directly affects the performance of spiral bevel gears. For the single tooth surface detection technology, the digital precision measurement and reverse adjustment correction technology can be used to truly...
In the process of automobile manufacturing, as an important part of the transmission system, the quality of the gear directly affects the usability and reliability of the whole vehicle. The main factors affecting the quality of automobile gears are materials and heat treatment process. Heat treatment makes the gears...
Since the mid-1980s, China’s gear industry has developed rapidly. Due to the high requirements of technical parameters, the gear required by automobile puts forward higher requirements for the quality of gear heat treatment. In order to further improve the quality level of gear heat treatment in China, meet the...
In the early automobile gear production, heat treatment induction quenching was widely used because of its high production efficiency, small workpiece deformation, energy conservation and environmental protection, easy automation and so on. According to the strength standard of American AGM a gear, the contact fatigue strength of heat-treated induction...
Heat treatment carbonitriding process is frequently used because it can effectively improve the depth of carburizing layer, obtain high hardness, ensure fine austenite grain, reduce part deformation, improve gear strength and wear resistance within a given time. Harbin North Special Vehicle Manufacturing Co., Ltd. has continuously studied the heat...
Heat treatment carburizing process can make gears have good comprehensive mechanical properties, so it is most widely used in the production of automobile gears. At present, the heat treatment carburizing process used in the production of automobile gears in the world is mainly gas carburizing. Gas carburizing is the...
Automobile gears are usually made of low-carbon alloy carburized steel. Gear blanks generally need to go through multiple cold and hot processing processes such as forging ※ pre heat treatment ※ cutting ※ carburizing and quenching ※ finishing, so as to obtain high surface hardness and good core toughness,...