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Technical route for mechanical processing

2018/5/9 17:29:11 Viewers:
Professional provide mechanical processing general principles of the process route.

The formulation of machining process rules can be roughly divided into two steps. The first is to draw up the process route of parts processing, and then determine the size of the process, the equipment and equipment used in each process, the cutting specification, the quota of the working hours and so on. These two steps are interrelated and should be comprehensively analyzed. The formulation of the process route is the overall layout of the process. The main task is to select the processing methods of each surface, to determine the processing order of each surface, and to the number of the process in the whole process. The general principles for machining process planning are as follows:

1. First processing datum
In the process of manufacturing parts, the surface as the Wei datum should be first processed, so as to provide a precise benchmark for the subsequent processing. It is called the "baseline".

2. Divide the processing stage
The surface with high quality requirement is divided into three stages, which are rough machining, semi finishing and finishing. The main purpose is to ensure the quality of processing, to facilitate the rational use of equipment, to facilitate the arrangement of heat treatment processes, and to find rough defects and other mechanical processes.

3, first face and rear hole
For the box, bracket and connecting rod and other parts, the plane hole should be machined first. In this way, Wei machining holes can be fixed in plane to ensure the position accuracy of the plane and hole, and the machining of holes on the plane will bring convenience to machining.

4. Finishing
The workpiece after finishing: the finishing process of the main surface (such as grinding, honing, grinding and rolling, etc.), should be placed at the last stage of the process route. The surface finish of the processed surface is above Ra0.8um, and the slight collision will damage the surface. In the countries of Japan, Germany and other countries, the flannelette should be used after the finishing process. Dui is not allowed to contact the workpiece directly by hand or other objects, so as to prevent the surface damage due to transshipment and installation.