A computer-aided tolerance specification method based on multiple attributes decision-making
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ORIGINAL ARTICLE
A computer-aided tolerance specification method based on multiple attributes decision-making Qijian Zhao 1
&
Tukun Li 2 & Yanlong Cao 3 & Jiangxin Yang 3 & Xiangqian Jiang 2
Received: 3 May 2020 / Accepted: 22 September 2020 / Published online: 16 October 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract In the mechanical product design, tolerance specification is a crucial process to select tolerance types to control the geometrical variation of the features on a workpiece. Tolerance specification is a kind of decision-making process which needs to consider many influential factors of the manufacturing cost and quality requirement of a workpiece. In this context, those factors are classified into two categories, that of static factors from the rules and standards, and that of dynamic factors based on the manufacturing site’s information. This paper presents a novel method for computer-aided tolerance specification to evaluate both types of factors while the traditional methods only take the static factors into considerations. Those factors are assessed by the developed MADM (multiple attributes decision-making) algorithm, assisted with the rule-based algorithm and axiomatic design algorithm. A case study is undertaken, and its result shows the effect of dynamic factors on the output of tolerance specification. The results adhere to the ISO standard. Keywords Geometric tolerances . Tolerance specification . Computer-aided tolerancing (CAT) . Multiple attributes decision-making (MADM) . Axiomatic design (AD)
1 Introduction It is of importance that a mechanical engineer balances the quality requirement and the manufacturing cost of a workpiece in the design stage. To this end, the tolerance design is usually employed after the functional/structure design [1]. Tolerance design is to develop the permissible variation limit of the dimensions and geometric parameters of workpieces, which aims to address functional and assembly requirements under a limited cost [2]. Tolerance design usually consists of three tasks: tolerance specification, tolerance allocation and tolerance analysis [3–7]. This paper mainly focuses on the tolerance specification, * Qijian Zhao [email protected] 1
Institute of Mechanical Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900, China
2
EPSRC Future Advanced Metrology Hub, Centre for Precision Technologies, School of Computing and Engineering, University of Huddersfield, Huddersfield HD1 3DH, UK
3
Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
which is to determine datum reference frame (DRF) and select the geometrical tolerances on a workpiece. Some works have been done for the computer-aided tolerance specifications via different approaches to model information from various resources. Clemént [8, 9] introduced the technologically and topologically related surfaces (TTRS) model which calculates the extracted informa
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