What are the machining requirements for precision parts?
For precision parts, the processing is very strict, and the processing technology is knife, knife, etc. Size has specific requirements, precision also has requirements, such as 1mm plus or minus how many microns, if the size is wrong too much will become waste, then it is equivalent to reprocessing, time-consuming and laborious, and sometimes even make the entire processing material scrapped, resulting in an increase in cost, while the parts are certainly not used.
For precision parts processing is mainly dimensional requirements, such as how many cylinder diameters, there are strict requirements, the positive and negative errors within the required range are qualified parts, otherwise they are unqualified parts; Three high also has specific strict requirements, positive and negative errors are also specified, such as embedded cylinder (z simple and basic parts as an example), if the diameter is too large, exceed the allowable error range, will cause can not go in, if the actual diameter is too small, exceed the allowable error threshold of the negative value, it will cause too loose, unstable insertion problems. These are unqualified products, or the cylinder length is too long or too short, beyond the allowable error range, is unqualified products, to be scrapped, or reprocessing, is bound to cause an increase in costs.
The above is the requirements of precision machinery parts processing technology, is the main size problem, must be strictly in accordance with the additional drawings processing, the actual processing size will not be completely consistent with the theoretical size of the drawings, but as long as the processing size within the allowable error range for qualified parts, so precision parts processing requirements strictly in accordance with the theoretical processing size processing.
The second is advanced precision parts processing equipment and testing equipment, advanced processing equipment makes the processing of precision parts simpler, higher precision and better effect. Inspection equipment can detect parts that do not meet the requirements, so that all products sent to customers really meet the requirements.
As long as the CAD is simple, a mechanical part generally needs to draw three pictures on a piece of paper: the main view (the picture seen from the front of the part), the front view (the picture seen from the top of the part), and the left view (the picture seen from the left side of the part). Generally simple parts can be expressed clearly by drawing these three pictures, such as gear shafts and so on. Complex structure of the diagram, but also draw a section view, local enlargement, that is, a part of the part is cut open, the internal structure and size of its clear expression, such as screw holes, gear boxes, gears, etc. Know so much is not enough, if you want to know how to draw in detail, but also look at the mechanical parts diagram, in fact, most of the actual use of assembly drawings, there are many details to pay attention to, more practice, and then read the book is OK.
