1. The main surface is an inner cylindrical surface, with high dimensional tolerance grade and small surface roughness Ra value of 1.
Measures taken: divide the processing stages, and adopt the process route: drilling-rough boring (expanding)-semi-finish boring (reaming)-rough grinding-fine grinding-grinding; Select precision machine tools; Control cutting parameters; Cool thoroughly.
2. Because of the high dimensional tolerance of the outer cylindrical surface, the surface roughness Ra is small.
Therefore, the measures taken are as follows: the requirements for the division of machining stages, the selection of machine tools and the control of cutting parameters are the same as those for inner cylindrical surface machining. In addition, the process route is: rough turning-semi-finish turning-rough grinding-fine grinding.
3. The outer cylinder 45r6 requires high radial runout of the inner hole 32H7.
One of the measures taken: positioning and clamping with non-matching outer cylindrical surface, grinding the inner hole with one clamping? 32H7, outer cylinder? 45r6, that is, the method of "one knife". However, this method has frequent adjustment of machine tools, long auxiliary time and low production efficiency, and is only suitable for single piece production.
The second measure: the inner cylindrical surface is limited by the taper mandrel, and the outer cylindrical surface is grinded with the center holes at both ends of the mandrel. This method is easy to operate, high in production efficiency, stable and reliable in quality, but it needs to manufacture special machine tool fixtures, so it is suitable for batch production.
Mechanical processing sequence arrangement
Turning end face-turning excircle-drilling-boring-grinding. Among them, the finish machining of the inner hole should be carried out before the finish machining of the outer surface.
Division of processing stages
The whole machining process is divided into four stages: rough machining, semi-finish machining, heat treatment and finish machining.
Service hotline
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