1 parts usually by a combination of multiple surface layers, the production and processing of each surface layer is generally required to be completed in stages. In the reasonable arrangement of precision machinery parts processing production processing sequence, should first centralize the rational arrangement of each surface layer of rough machining, in the middle according to the need for reasonable arrangements for semi-finishing, and finally reasonable arrangements for finishing and finishing production processing. For the high precision requirements of the workpiece, in order to reduce the deformation caused by rough machining on the impact of finishing, usually rough and finish machining should not be completed continuously, but should be completed in stages, spacing moderate time periods.
Non-standard parts machining cutting process flow reasonable arrangement of the general principle is: the front of the work needs to be fully prepared for the work after the foundation, to do a good job of service.
In the process of non-standard parts machining, the foundation is the most important, precision mechanical parts processing is also the same, often the first production and processing of fine benchmark, followed by a change of fine benchmark positioning production and processing of other surface layers.
For the box parts, usually the main hole as a rough benchmark for the production of processing plane, and then the plane as a fine benchmark for the production of processing hole system; for shaft parts, generally is the outer circle as a rough benchmark for processing the center hole, and then the center hole as a fine benchmark for the production and processing of the outer circle, end face and other surface layers. If there are several fine benchmark, it should be in accordance with the sequence of benchmark conversion and gradually improve the processing accuracy of the principle to rationalize the production and processing of the base surface and the main surface layer.
