Processing route of various types of precision shafts of precision parts

The formulation of the processing route of precision parts is to formulate the overall layout of the process. The main task is to select the processing method of each surface, determine the machining sequence of each surface, and the number of processes in the entire process.

The main surface of all kinds of precision hardware shaft parts is the outer surface of each journal. Generally, the accuracy of the inner hole of the hollow shaft is not high, and the accuracy requirements of the secondary surfaces such as threads, splines, and keyways on the precision hardware shaft are also relatively high. Therefore, the processing route of shaft parts mainly considers the processing sequence of the outer circle, and reasonably intersperses the processing of the secondary surface. Let me introduce to you the processing routes of various precision hardware shaft parts of different precision and different materials commonly used in production:

1. The processing route of precision hardware shaft parts of general carburized steel: material preparation - forging - normalizing - drilling top holes - rough turning - semi-finishing turning, finishing turning - carburizing (or carbonitriding) - quenching, low temperature return Fire - rough grinding - secondary surface finishing - fine grinding;

2. The processing route of precision hardware shafts of general precision quenched and tempered steel: material preparation - forging - normalizing (annealing) - top hole drilling - rough turning - quenching and tempering - semi-finishing, finishing - surface quenching, tempering - rough grinding - secondary surface finishing - fine grinding;

3. Processing route of precision nitrided steel shaft parts: material preparation - forging - normalizing (annealing) - top hole drilling - rough turning - quality - semi-finishing, finishing - low temperature aging - rough grinding - nitriding treatment - Minor surface finishing - fine grinding - smooth grinding.

4. The processing route of integral quenching precision hardware shaft parts: material preparation - forging - normalizing (annealing) - top hole drilling - rough turning - quenching and tempering - semi-finishing turning, fine turning - secondary surface processing - overall quenching - rough grinding - Low temperature aging - fine grinding.

For general precision hardware shaft parts, the final process of fine grinding is enough to ensure the processing quality. For precision shaft parts, in addition to finishing, finishing processing should also be arranged. For shaft parts other than overall quenching, the finishing process can be Depending on the specific situation, it is arranged before the quenching heat treatment, or after the quenching heat treatment, before the secondary surface processing.

It should be noted that the quenched parts cannot be used with general knives. The main surface of shaft parts is the outer surface of each journal. Generally, the accuracy of the inner hole of the hollow shaft is not high, and the threads and splines on the precision spindle are The accuracy requirements of secondary surfaces such as keyways and keyways are also relatively high. Therefore, the processing route of shaft parts mainly considers the processing sequence of the outer circle, and the processing of the secondary surface is reasonably interspersed.