Abstract This paper presents a methodology for dynamic modeling and simulation of a fixture-workpiece system. A simulation approach is required since standards typically do not exist for dynamic situations like machining operations. In addition, an accurate model is developed for the contact interface at each locating and clamping region on the workpiece's surface. An end milling operation is simulated to analyze the effects of various factors on workpiece accuracy and demonstrate the advantage of the simulation approach. The clamping forces required to keep the workpiece in contact with its locators are obtained, and the influences of locator placement, clamp placement, clamping forces, and clamping sequence on linear and angular errors are reported. Elastic effects of the locator-workpiece and clamp-workpiece contacts, yielding nonlinear dynamic equations of motion, are included in the model. Since system dynamics are considered, results are obtained as a function of time. The study compares well with previous experimental work by other investigators, and the method shows promise as a fixture design tool.
[1]
Vasiliĭ Andreevich Arshinov,et al.
Metal cutting theory and cutting tool design
,
1976
.
[2]
Gyula Hermann.
Process intermittent measurement of tools and workpieces
,
1985
.
[3]
Fryderyk E. Gorczyca.
Application of metal cutting theory
,
1987
.
[4]
G.S.A. Shawki,et al.
Rigidity considerations in fixture design—rigidity of clamping elements
,
1966
.
[5]
G S A Shawki.
Rigidity considerations in fixture design—contact rigidity for eccentric clamping
,
1967
.
[6]
E. J. Haug,et al.
Computer aided kinematics and dynamics of mechanical systems. Vol. 1: basic methods
,
1989
.
[7]
M. A. Chace,et al.
A Sparsity-Oriented Approach to the Dynamic Analysis and Design of Mechanical Systems—Part 1
,
1977
.
[8]
G S A Shawki,et al.
Rigidity considerations in fixture design—contact rigidity at locating elements
,
1966
.
[9]
G.S.A. Shawki,et al.
Effect of fixture rigidity and wear on dimensional accuracy
,
1965
.