The Min-Max Load Criteria as a Measure of Machining Fixture Performance

[+] Author and Article Information
E. C. DeMeter

Department of Industrial & Management Systems Engineering, The Pennsylvania State University, University Park, PA 16802

J. Eng. Ind 116(4), 500-507 (Nov 01, 1994) (8 pages) doi:10.1115/1.2902134 History: Received October 01, 1992; Revised November 01, 1993; Online April 08, 2008


Spherical-tipped locators and clamps are often used for the restraint of castings during machining. For structurally rigid castings, contact region deformation and micro-slippage are the predominant modes of workpiece displacement. In turn contact region deformation and micro-slippage are heavily influenced by contact region loading. This paper presents a linear model for predicting the impact of locator and clamp placement on workpiece displacement throughout a series of machining operations. It illustrates how the continuum of external loads exerted on a workpiece during machining can be bounded within a convex hull, and how the extreme points of this hull are used within the model. Finally it describes the simulation experiments which were used for model validation.

Copyright © 1994 by The American Society of Mechanical Engineers
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