In the process of machining non-standard parts, the foundation is important. The machining of precision mechanical parts is also the same. Always use the fine reference first, and then use the fine reference to position other surfaces. Next, let's take a look at me in detail.

 

  For the box parts, the plane is usually processed with the main hole as the rough reference, and then the plane is used as the fine reference for the hole system; for the shaft parts, the outer circle is generally the rough reference machining center hole, and then the center hole is used as the fine reference processing. Other surfaces such as the outer circle and the end surface. If there are several fine benchmarks, the processing of the base surface and the main surface should be arranged in accordance with the order of the benchmark transformation and the principle of gradually improving the machining accuracy.

 

  For workpieces such as cabinets, brackets, and connecting rods, the plane-finished holes should be machined first. Because the contour of the plane is flat and the area is large, the machining plane is first processed by the plane to ensure the stable and reliable positioning reference of the hole during processing, and the positional accuracy between the hole and the plane is ensured.

 

Non-standard precision mechanical parts

 

  A part usually consists of multiple surfaces, and the processing of each surface generally needs to be carried out in stages. When arranging the order of machining of precision mechanical parts, the roughing of each surface should be concentrated first, and semi-finishing should be arranged in order according to the needs, and then finishing and finishing should be arranged. For workpieces with high precision requirements, in order to reduce the influence of deformation caused by roughing on finishing, usually coarse and fine machining should not be carried out continuously, but should be carried out in stages and at appropriate intervals.

 

  The general principle of the non-standard parts processing and cutting process arrangement is that the previous work needs to prepare for the later work, lay a good foundation and do a good job. The specific working principle of non-standard parts processing can be divided into four aspects:

 

  The main surface of the parts is generally the surface with high processing precision or surface quality requirements. The quality of the processing has a great influence on the quality of the whole part. The processing steps are often more, so the main surface should be arranged first. Other surface finishes are then appropriately arranged interspersed between them. The assembly base surface, the work surface, and the like are generally regarded as the main surface, and the key groove, the light hole for fastening, the screw hole, and the like are regarded as the secondary surfaces.