Gear shaft processing technology analysis

The machining sequence is arranged according to the principle of base surface first, rough first then fine, main first then secondary. For general parts of gear shaft, after the center hole is prepared, the outer circle is processed first, and then other parts are processed, and it is important to separate rough and fine processing. In the gear shaft processing technology, heat treatment is used as a sign, rough processing before quenching and tempering treatment, semi-finishing before quenching treatment, and fine processing after quenching. After separating the stages in this way, the fine processing of the main surface is guaranteed, and the stress during processing of other surfaces will not affect the accuracy of the main surface.
When arranging the order of gear shaft processes, the following points should also be noted.

(1) The rough machining of the tooth profile of the shaft should be arranged after the semi-finishing of the outer circles of the gear shaft. Because the gear shaft has a relatively large workload and is difficult to process, the processing position should be appropriately placed a little later to increase the positioning height of the positioning reference. The tooth profile finishing should be arranged after all the outer circles of the part are processed, so as to eliminate the heat treatment deformation caused by the local quenching of the tooth profile.
(2) The processing sequence of the outer circle surface should be to process the large diameter outer circle first, and then the small diameter outer circle, so as not to reduce the rigidity of the workpiece at the beginning.
(3) The processing of secondary surfaces such as keyways on gear shafts should generally be arranged after the outer circle finishing or rough grinding and before the outer circle finishing. If the keyway is milled before finishing, on the one hand, before finishing, the vibration caused by intermittent cutting will affect the processing quality and easily damage the tool; on the other hand, the size requirements of the keyway are also difficult to guarantee. These surface processing should not be arranged after the main surface finishing, so as not to damage the main surface accuracy.