An Integrated Model of a Fixture-Workpiece System for Surface Quality Prediction |
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Authors: | YG Liao SJ Hu |
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Affiliation: | (1) NA Car Group, General Motors Corporation, MC 480-305-2000, 5330 Clearview Drive, Troy, Michigan 48098, USA, US;(2) Department of Mechanical Engineering and Applied Mechanics, 2350 Hayward Street, The University of Michigan, Ann Arbor, Michigan 48109, USA, US |
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Abstract: | Surface quality is a major factor affecting the performance of a component. The machined surface quality is strongly influenced
by the external loads during the fixturing and machining processes. In machining process development, it is highly desirable
to predict the quality of a machined surface. For this purpose, an integrated finite element analysis (FEA) model of the entire
fixture–workpiece system is developed to investigate the influence of clamping preload and machining force on the surface
quality of the machined workpiece. The effects of fixture and machine table compliance (from experimental data), and the workpiece
and its locators/clamps contact interaction, and forced vibration, on the machined surface quality are taken into account.
This simulation model provides a better understanding of the causes of surface error and a more realistic prediction of the
machined surface quality. The deck face of a V-type engine block subjected to fixture clamping and a face milling operation
is given as an example. A comparison between the simulation result and experimental data shows a reasonable agreement. |
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Keywords: | :Clamping preload Fixture Forced vibration Machining force Surface error |
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