Browsing by Author "Kapoor, S.G."
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Item Dynamic Generation of Machined Surfaces Part 1: Description of a Random Excitation System(1990) Zhang, G.M.; Kapoor, S.G.; ISRWith increasing emphasis on the adaptive control for the purpose of quality and productivity improvement, it becomes necessary to develop models which can correlate the surface finish parameters with the machining conditions as well as workpiece material characteristics. This paper presents a study that leads to the development of a model for the dynamic generation of three- dimensional texture of machined surfaces. In Part I, the mathematical formulation of the random excitation system which is responsible for the random portion of a surface profile is developed. It is assumed that the random excitation system originates from the nonhomogeneous distribution of microhardness of workpiece material. Machining tests are also performed to verify the validity of such a model development. In Part 2, a procedure for the construction of three-dimensional topography will be developed and the relationship between the machining conditions and the surface finish parameters will be established.Item Dynamic Generation of Machined Surfaces Part 2: Construction of Surface Topography(1990) Zhang, G.M.; Kapoor, S.G.; ISRIn Part I of these two-part papers, a normal distribution model has been formulated to describe the random excitation system present during machining. Part 2 presents a methodology to dynamically generate the surface topography under the random excitation environment through computer simulation. The proposed methodology uses the tool vibratory motion along with the tool geometrical motion to construct the topography of a machined surface. Both experimental and simulation results confirm that when a small feed is used, the influence of the spiral trajectory of tool geometrical motion on the surface generation decays dramatically and the random excitation system, on the opposite, is strengthened playing a significant role in surface texture generation.