The level of machining accuracy of stainless steel parts is determined according to the requirements of use. The machining of aerospace parts requires high precision, while the parts on tractors may require relatively low requirements.
The cost of the parts is closely related to the machining accuracy. The 7-level precision should be relatively high precision. Going up, such as 6-level, 5-level, and 4-level, is a higher precision. For each additional precision level, stainless steel parts are processed. The difficulty of processing will increase geometrically, and the requirements for processing machine tools and tools will be higher, and workers will also be required to have a higher level of processing.
For example, the 7th grade precision of stainless steel parts can be achieved with general machine tools and tools, but the 6th grade requires a grinder, and the 5th grade requires CNC machine tools and fine grinding, or even manual grinding, and the 4th grade is even more. Disaster.
For each additional level of accuracy, there may be several more processes, several better machine tools, and many more skilled workers, so the cost of parts will increase a lot. In this way, a problem of processing economic precision is raised, that is, the parts with this precision are suitable and economical to use in a certain occasion. For example, for a certain part on a tractor, level 11 accuracy is enough. Of course, it is better to process it to 5 precision, but the cost of level 11 may only be 10 yuan, but the cost of level 5 may be 100 yuan or more. , is bad for the factory.
Therefore, the so-called economic accuracy is the lowest accuracy and lowest cost under the conditions of meeting the requirements of use, so as to achieve the purpose of maximizing benefits. After my analysis, you should also be able to feel the relationship between it and the machining process specification. The process specification should be formulated according to economic accuracy.