How to Arrange the Working Procedure of Non-Standard Parts?

This is very important, because once the process is wrong, the following work will also be wrong. If it is not corrected in time, then the quality of the finished product will definitely be a problem, so the process must be arranged carefully, then the following Let's take a look at how to do the process arrangement of non-standard parts processing?

First, set a benchmark, the benchmark must be determined first.Just like building a house, the foundation determines the height. The foundation must be laid well before the house can be built high. The same applies to the machining of precision mechanical parts. The precision datum is always processed first, and then the other surfaces are processed with the precision datum. 

For example, for box parts, the main hole is generally used as the rough reference machining plane, and then the plane is used as the fine reference machining hole system; for the shaft parts, the outer circle is generally used as the rough reference machining center hole, and then the center hole is used as the precision Standard processing of other surfaces such as outer circles and end faces. If there are several precise datum, the processing of the base and main surfaces should be arranged in accordance with the order of datum conversion and the principle of gradually improving the machining accuracy.

Secondly, the processing order of non-standard parts must be determined, and the order must be well done. Generally, the main order is made first, and then the secondary order.

The main surfaces of the parts are generally surfaces with high processing accuracy or surface quality requirements. Their processing quality has a great impact on the quality of the entire part. Their processing procedures are often more, so the processing of the main surface should be arranged first. Then arrange other surface processing to intervene between them. Generally, the assembly base surface, working surface, etc. are regarded as the main surface,and the keyway, light hole and screw hole for fastening are regarded as the secondary surface.

Again, the main and the secondary should be clearly divided, first do the important, and do the second.

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

Finally, make the plane first and make the hole.

For workpieces such as boxes, brackets and connecting rods, the plane should be machined before the hole. Because the contour of the plane is flat and the area is large, processing the plane first and then positioning the hole with the plane can not only ensure that the hole has a stable and reliable positioning reference during processing, but also help to ensure the position accuracy requirements between the hole and the plane.