The box requires many surfaces to be machined. The machining requirements for each surface are different, and some require high precision, such as spindle holes, so the machining accuracy of the box becomes a key issue for the process. In view of this, In the processing of parts, we must also pay attention to the following points:
1. The roughing and finishing stages should be separated
Above we also mentioned that there are many surfaces to be machined and the accuracy requirements are not the same. Therefore, it is necessary to separate the coarse and fine processing during operation, and it is not possible to carry out fine machining immediately after rough machining, because this will easily lead to deformation of the box. Affect the accuracy.
2, should be in accordance with the first rear hole processing sequence
The first processing of the plane not only cuts off the unevenness of the surface of the rough surface, but also traps sand on the surface. What is more important is that when processing the holes distributed on the plane, it is convenient to draw lines and correct them, and when the boring tool starts to boring holes, There is no impact vibration or damage to the tool due to uneven surfaces. Therefore, it is generally best to machine the plane first.
3, arrange the appropriate heat treatment process
Casting box structure is complex, uneven wall thickness, cooling speed is inconsistent when casting, easy to produce internal stress, and the surface is hard, therefore, should be reasonably arranged after sandblasting, tempering people.
4, the process of centralized or decentralized decision
The box coarse and finishing phases are separated according to the principles of process dispersion. However, in order to reduce the number of machine tools and fixtures used and to reduce the number of handling and installation of the box, the rough and finish machining stages can be relatively Focus on the same machine as much as possible