10
2022
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01
摩托车链轮试制所需渗碳淬火实例
Introduction to carburizing and quenching examples required for trial production of motorcycle sprockets:
The method of increasing the effective depth of carburized and quenched hardened layer and its control effect on gear distortion are as follows.
Motorcycle sprockets are carburized and quenched using a multi-purpose furnace. When the effective hardening layer is 0.922mm higher and the effective hardening layer depth in small batches is 0.680mm, the splines are qualified. When the effective hardened layer depth of mass-produced gears is 0.594mm, there is a deviation in the lower part, and the spline is swollen, which is unqualified. In this regard, the effective hardened layer depth of the substandard motorcycle sprocket should be within the upper middle dimensional tolerance, and the splines should be qualified. The effective hardening layer depth and spline hole distortion of carburized and quenched motorcycle sprockets are shown in Table 4-17. Figures 4-85 show the direction of motorcycle sprocket loading.
In actual production, due to untimely detection of the spline hole, the size of the broach in use decreases, and the spline hole of the motorcycle sprocket shrinks after heat treatment. Therefore, the depth of the carburized layer can be appropriately reduced, the hardness of the center can be reduced, and the qualified rate of gear spline hole deformation can be improved.
Some motorcycle sprocket splines have a surface hardness of ≤ 50HRC after heat treatment, and there is no requirement for the hardness of the two end faces. After heat treatment and finishing, gears with low internal spline hardness can be re aligned with a broach to ensure that the major diameter of the spline is qualified. For this type of motorcycle sprocket, it would be better to first carburize, then cut off the carburized layer, and then broach the splines.
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