Workpiece location relative to the cutting tool is affected by the accuracy of part placement in the fixture. A number of error sources are known to contribute to the resulting workpiece location error, which can lead to poor part quality. The major sources include fixture geometric error and elastic deformation of the fixture and workpiece due to fixturing forces. In this paper, workpiece location error is predicted by modeling the process of part loading (given fixture geometric variations) and clamping (given deformations at the contact points) in a machining fixture. Linear elastic models for the fixture elements, contact mechanics models at the region of contact, and the flexibility influence coefficient method for the bulk elasticity of the workpiece have been used to model the compliance of the entire fixture-workpiece system. The deformations at the contact points are obtained by solving a constrained optimization model. The effect of geometric errors and compliance on workpiece location error is examined using part response points as a measure of quality, through examples involving a 3-2-1 machining fixture.
Skip Nav Destination
ASME 2003 International Mechanical Engineering Congress and Exposition
November 15–21, 2003
Washington, DC, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
0-7918-3720-3
PROCEEDINGS PAPER
Prediction of Workpiece Location Error Due to Fixture Geometric Errors and Fixture-Workpiece Compliance
Anand Raghu,
Anand Raghu
Georgia Institute of Technology, Atlanta, GA
Search for other works by this author on:
Shreyes N. Melkote
Shreyes N. Melkote
Georgia Institute of Technology, Atlanta, GA
Search for other works by this author on:
Anand Raghu
Georgia Institute of Technology, Atlanta, GA
Shreyes N. Melkote
Georgia Institute of Technology, Atlanta, GA
Paper No:
IMECE2003-42126, pp. 273-280; 8 pages
Published Online:
May 12, 2008
Citation
Raghu, A, & Melkote, SN. "Prediction of Workpiece Location Error Due to Fixture Geometric Errors and Fixture-Workpiece Compliance." Proceedings of the ASME 2003 International Mechanical Engineering Congress and Exposition. Manufacturing. Washington, DC, USA. November 15–21, 2003. pp. 273-280. ASME. https://doi.org/10.1115/IMECE2003-42126
Download citation file:
23
Views
Related Proceedings Papers
Related Articles
Dynamic Material Behavior Modeling Using Internal State Variable Plasticity and Its Application in Hard Machining Simulations
J. Manuf. Sci. Eng (August,2006)
In Memoriam: Erastus H. Lee
J. Appl. Mech (July,2007)
Modeling Machining Geometric Variation in a N - 2 - 1 Fixturing Scheme
J. Manuf. Sci. Eng (February,2006)
Related Chapters
GD&T as a Language
Geometric Dimensioning and Tolerancing Handbook: Applications, Analysis & Measurement
GD&T as a Language
Geometric Dimensioning and Tolerancing: Applications, Analysis, Gauging and Measurement [per ASME Y14.5-2018]
Introduction to Contact Problems in Structural Mechanics
Contact in Structural Mechanics: A Weighted Residual Approach