What should be paid attention to when arranging the process sequence in gear shaft processing plant?

The processing sequence is arranged according to the principle of base surface first, rough first and fine second, and main first and secondary second. For general gear shaft parts, after the center hole is prepared, the excircle should be machined first, and then other parts should be machined. Pay attention to the fact that rough machining and finish machining should be carried out separately. In the gear shaft processing technology, heat treatment is the symbol, rough machining before quenching and tempering, finish machining before quenching and finish machining after quenching. In this way, after each stage is separated, it is guaranteed that the main surface will be finished finally, and the main surface accuracy will not be affected by the stress during other surface processing.

When arranging the sequence of gear shafts, we should also pay attention to the following points.

The rough machining of (1) shaft's tooth profile should be arranged after the semi-finish machining of the gear shaft's excircle, because as a gear shaft, tooth profile machining is a relatively heavy workload and difficult processing content. Proper playback of the machining position can improve the positioning height of the positioning datum, and the tooth profile finish machining should be arranged after all the excircles and other surfaces of the parts are machined, so as to eliminate the heat treatment deformation caused by local quenching of the tooth profile.

(2) The processing sequence of the excircle surface should first process the large-diameter excircle, and then process the small-diameter excircle to avoid reducing the rigidity of the workpiece from the beginning.

(3) Machining of secondary surfaces such as keyways on gear shafts should generally be arranged after finish turning or rough grinding of the excircle, but before fine grinding of the excircle. If the keyway is milled before finish turning, on the one hand, the vibration caused by intermittent cutting before finish turning will not only affect the machining quality, but also easily damage the tool; On the other hand, it is difficult to ensure the size requirements of keyway. These surface treatments should not be arranged after the fine grinding of the main surface, so as not to damage the main surface accuracy.