# 处理经济精度

**URL:** <https://www.cax.do/t/processing-economic-precision/57>\
**Category:** Techniques\
**Tags:** process\
**Created:** [2024 年10 月 22 日 12:31 UTC](https://www.cax.do/t/processing-economic-precision/57 "2024-10-22T12:31:16Z")\
**Posts on this page:** 1\
**Page:** 1

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作者： ![Max](https://www.cax.do/user_avatar/www.cax.do/max/32/257_2.png) [@Max](https://www.cax.do/u/Max)\
发布日期： [2024 年10 月 22 日 12:31 UTC](https://www.cax.do/t/processing-economic-precision/57/1 "2024-10-22T12:31:16Z")

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Economic precision is a core concept in mechanical processing. From design to manufacturing, economic viability is crucial, as economic efficiency is the foundation for the survival of a factory. The level of processing precision should be determined based on usage requirements: aerospace parts require high precision, while bicycle components have relatively lower precision demands. The cost of a part is closely related to its processing precision. In mechanical processing, level 7 precision is considered high, while levels 6, 5, and 4 are increasingly precise, with each increase in level significantly raising the difficulty of machining. For example, level 7 precision can be achieved using ordinary machine tools, level 6 requires grinding machines, level 5 necessitates precision grinders or manual polishing, and level 4 is even more challenging. As precision increases, the number of processes rises, and the demand for high-precision machinery and skilled workers increases, leading to a significant rise in costs.

This brings us to the issue of economic precision: in specific usage scenarios, it is essential to choose a processing precision that not only meets the requirements but is also economical. For instance, achieving level 11 precision for bicycle components is sufficient, while level 5 is better but comes at a high cost. Level 11 may only cost 10 yuan, while level 5 could reach 100 yuan or more, representing a waste of resources for the factory.

Economic precision refers to selecting the lowest-cost and suitably precise machining standards while meeting usage demands to maximize benefits. Therefore, the formulation of process guidelines must consider economic precision. Figure 1 illustrates the relationship between machining precision, defect rates, and economic viability, where the point with the lowest total cost represents the most economical precision.

 ![image](https://www.cax.do/uploads/default/original/1X/97ecb14f66b42227ac8834759c7545c1a7ce49cd.jpeg)  
Figure 1: The Relationship Between Machining Precision, Defect Rate, and Economic Viability  
Economic precision in mechanical processing refers to the economically reasonable range of the average deviation between the surface dimensions of a part and its nominal dimensions under conventional production conditions. The achievable economic precision varies among different machine tools under normal conditions, and this range defines their economic precision.  
 ![image](https://www.cax.do/uploads/default/original/1X/d5c613663ee617022bc315b316cedc4569036e76.jpeg)  
 ![image](https://www.cax.do/uploads/default/original/1X/fba6e3027725505c971a36ad515b38d4df335edd.jpeg)