功能边界在几何公差设计中的应用
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摘要
为了更好地运用现行公差标准中的边界理论进行机械精度和检具设计,介绍了ASME Y14.5和ISO/GPS公差标准中的边界概念及各自定义出发点和特点,深入分析两个标准中边界概念的不同之处,以及使用最大实体要求后边界的变化情况,探讨了在两个不同标准下使用最大实体要求时隐藏在背后的设计意图,并以电圆锯输出轴系统的几何公差设计为例,分析了边界理论的应用。正确应用功能边界进行几何公差设计,对合理保证零件的功能和可装配性、提高经济性有重要意义。
In order to make better use of boundary theory for the design of mechanical precision and function gauge in accordance with the current tolerance standard, the concepts, starting points and characteristics of boundary theory in ASME Y14.5 and ISO/GPS are introduced. An in-depth analysis is conducted on the difference of boundary concepts based on the two different standards and the boundary change by means of the maximum material requirement. The design intention beyond the maximum material requirement based on the two different standards is illustrated. The geometric-tolerance design of the electric saw output-shaft system is taken as an example to illustrate the application of boundary theory. It is of great significance to make proper use of functional boundary for the design of geometric tolerance, which is cost-effective. This will ensure the normal function of the parts and provide ease to the assembly.
In order to make better use of boundary theory for the design of mechanical precision and function gauge in accordance with the current tolerance standard, the concepts, starting points and characteristics of boundary theory in ASME Y14.5 and ISO/GPS are introduced. An in-depth analysis is conducted on the difference of boundary concepts based on the two different standards and the boundary change by means of the maximum material requirement. The design intention beyond the maximum material requirement based on the two different standards is illustrated. The geometric-tolerance design of the electric saw output-shaft system is taken as an example to illustrate the application of boundary theory. It is of great significance to make proper use of functional boundary for the design of geometric tolerance, which is cost-effective. This will ensure the normal function of the parts and provide ease to the assembly.
引文
[1]刘巽尔.公差原则和相关要求问答[M].北京:中国标准出版社,2012.
[2]潘淑清,刘巽尔.相关要求与边界设计[J].工程设计学报,2000(4):17-20.
[3]American Society of Mechanical Engineers.ASME Standard Y14.5—2009:Dimensioning and tolerancing principles[S].
[4]全国产品尺寸和几何技术规范标准化技术委员会.产品几何技术规范(GPS)标准汇编[M].北京:中国标准出版社,2014.
[5]ISO 14405-1:2010.Geometrical product specifications(GPS)—Dimensional tolerancing—part 1:linear sizes[S].
[6]ISO 8015:2011.Geometrical product specifications(GPS)—fundamentals-concepts,principles and rules[S].
[7]ISO 2768-2:1989.General tolerance Part-2:Geometrical tolerances for features without individual tolerance indications[S].
[2]潘淑清,刘巽尔.相关要求与边界设计[J].工程设计学报,2000(4):17-20.
[3]American Society of Mechanical Engineers.ASME Standard Y14.5—2009:Dimensioning and tolerancing principles[S].
[4]全国产品尺寸和几何技术规范标准化技术委员会.产品几何技术规范(GPS)标准汇编[M].北京:中国标准出版社,2014.
[5]ISO 14405-1:2010.Geometrical product specifications(GPS)—Dimensional tolerancing—part 1:linear sizes[S].
[6]ISO 8015:2011.Geometrical product specifications(GPS)—fundamentals-concepts,principles and rules[S].
[7]ISO 2768-2:1989.General tolerance Part-2:Geometrical tolerances for features without individual tolerance indications[S].