TIMKEN imported bearings super good quality, so a lot of trouble to manufacture. Many TIMKEN imports bearing manufacturers are not manufacturing, the only professional manufacturing technicians will produce bearing process.
TIMKEN bearing part of the imported chemical composition, shape, size and design requirements of the mechanical properties of different, using different quenching methods, each bearing steel of its fixed C curve, the cooling medium determines the microstructure and after quenching mechanical properties, must be the key consideration and analysis, in fact, many bearing parts of the heat treatment defects are directly related to the choice of cooling the TIMKEN imports bearing media, but also with the specific procedure.
In order to obtain the desired microstructure and properties of the workpiece in the heat treatment furnace heated to complete austenitizing, the need for quenching. After cooling, the workpiece should be martensite, the cooling rate must be greater than the critical cooling rate, cooling rate too fast to make the workpiece volume contraction and organizational change violent, causing great internal stress. Therefore, the obtain martensite conditions "F", so that the cooling speed as low as possible, and ideal cooling curve shown in Figure.
Suitable quenching medium significantly particularly important, it determines the microstructure and properties after quenching of the the TIMKEN imported bearing parts, usually the quenching medium solid, liquid and gas three kinds, according to the bearing of quenching media of state changes into biological state of change and biological state of change class.
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