碩士 / 國立中興大學 / 機械工程學系 / 86 / AbstractDue to the fast progress of industrial technology,
modern product structure becomes more complex with higher
precision. More attention has to be paid to the analysis and
control on the accuracy of a product design. Therefore it is an
important issue of design to estimate product accuracy from
related information, and the main factors affect the accuracy of
a machine including geometric tolerances generated in component
fabrication processes, clearancesamong mating parts, deformation
of force and temperature, and other externalfactors. This thesis
focuses on the combination of tolerance and force analyses.It
investigates accuracy variation of a structure by tolerance
accumulation andby forced deformation. Tolerance analysis is
based on a formal representationscheme, the tolerance network,
together with error models, interval andstatistical computation
methods, as well as a computer-aided tolerance analysissoftware
to estimate error accumulation of geometric tolerances and
fittingclearances. Force analysis is based on the principle of
equilibrium. It calculatesstructure deformation by finite
element analysis with forcing and boundaryconditions. Errors
caused by tolerances and external forces are combined toestimate
the variation of accuracy. This is further used as the
foundation forsensitivity analysis that provides a guide for
design modification. Themold-clamping mechanism of a plastic
injection machine is used to illustratethe procedure and result
of this method.
| Identifer | oai:union.ndltd.org:TW/086NCHU1489012 |
| Date | January 1998 |
| Creators | Lyu, Tai-Liang, 呂泰良 |
| Contributors | Tsai Jhy-Cherng, 蔡志成 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 84 |
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