Optimum design of the multifacet drill |
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| Authors: | T. I. Liu S. M. Wu |
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| Affiliation: | (1) Department of Mechanical Engineering, California State University, Sacramento, California;(2) Department of Me- chanical Engineering and Applied Mechanics, University of Michi- gan, Ann Arbor, Michigan |
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| Abstract: | A two-stage strategy has been used to design an optimum multifacet drill (MFD) for crankshaft drilling. In the first stage, a heuristic MFD was developed by adding an additional facet to the outer corner of the conventional split-point drill. Under accelerated life test conditions, this new drill can decrease thrust force by 21.0% and increase drill life by 50% compared to a split-point drill. In the second stage, compre-hensive force models for predicting thrust and torque were modified and developed. Using the force mod-els, point optimization was carried out to design the optimum MFD. This new MFD can further decrease the thrust by 21.3 % over the heuristic MFD, and accelerated life tests haveshowna25% further increase in drill life. |
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| Keywords: | force models optimum design thrust and torque |
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