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QUALITY-ORIENTED DESIGN APPROACH OF
DIMENSIONAL CHAIN AND
STATISTICAL TOLERANCE
ZHANG Yu1 YANG Musheng1 LI Xiaopei2
(1. College of Mechanical Engineering, Shandong University of Technology, Zibo 255049;
2. China Academy of Machinery Science &
Technology, Beijing 100044
)
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Abstract: In order to reasonably determine the statistical tolerances (STs) of components links for realizing predetermined quality targets and assuring the precision and quality targets of closing link, it is necessary to settle the problems of the configuration and concurrent design of quality indices, STs and the parameters of SPC in design for dimensional chain. A scheme consists of three levels of quality-oriented statistical tolerancing for components links is established, and the design approach for assuring the precision and quality targets of components links and closing link is presented, and the comprehensive application of quality–oriented statistical tolerancing technique in design and calculation for dimensional chain is shown by a case study. The STs, quality indices of closing links and component links can be concurrently designed, coordinately distributed and quantitively analyzed. This new design approach for dimensional links can be supported by a series of electrical tables with graphics and systematic software. It can distribute the STs of each component links based on the precision requirement and quality target of closing link, and fully utilize the known statistical parameters of component links to realize the predetermined precision and quality by the economical manufacturing tolerances and suitable SPC method.
Key words: Statistical tolerance Quality index
Statistical process control Dimensional chain
CLC No: TG801 TG802
国家自然科学基金资助项目(50175066). Received 20060426, received in revised form 20061225
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