This is very important, because once the process is wrong, there will be errors in the subsequent work. If it is not corrected in time, then the quality of the finished product will definitely have problems, so the process arrangement must be cautious, then the following Let's take a look at how to arrange the process arrangements for the processing of non-standard parts?
First of all, to lay a good benchmark, the benchmark must first be determined.
Just like building a house, the foundation determines the height, and the foundation must be well laid before the house can be built high. The same is true for precision mechanical parts processing, always processing the fine datum first, and then use the fine datum to position and process other surfaces. For example, for box parts, the main hole is generally used as the rough reference to machine the plane, and then the plane is used as the finishing reference to machine the hole system; for shaft parts, the outer circle is generally used as the rough reference to machine the center hole, and then the center hole is used as the fine Benchmark processing of external circles, end faces and other surfaces. If there are several precision benchmarks, the processing of the base surface and the main surface should be arranged in accordance with the sequence of benchmark conversion and the principle of gradually improving the processing accuracy.
Secondly, the processing order of non-standard parts should be determined, and the order should be done well. Generally, do the main first and then do the secondary.
The main surfaces of parts are generally surfaces with high machining accuracy or surface quality requirements. Their machining quality has a great influence on the quality of the entire part, and there are often more processing procedures. Therefore, the main surface processing should be arranged first. Then arrange other surface processing appropriately to intersperse among them. Generally, the assembly base surface, working surface, etc. are regarded as the main surface, and the keyway, the smooth hole and screw hole for fastening, etc. are regarded as the secondary surface.
Once again, the primary and secondary must be clearly distinguished. Do the important first and do the secondary.
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 processing sequence of precision mechanical parts, the rough processing of each surface should be arranged first, the semi-finishing processing should be arranged in sequence according to the needs, and the finishing and finishing processing should be arranged at the end. For workpieces with high precision requirements, in order to reduce the influence of deformation caused by rough machining on finishing, 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 holes.
For workpieces such as boxes, brackets, and connecting rods, the plane should be processed first and then the holes should be processed. Because the contour of the plane is flat and the area is large, the plane is processed first and then the hole is processed by the plane, which can ensure that the hole has a stable and reliable positioning datum during processing, but also helps to ensure the accuracy of the position between the hole and the plane.
