科研之友
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摘要
Centerless grinding is an abrasive machining process commonly used in the aerospace and automotive industries for shaping axisymmetric components that require a high dimensional accuracy and a smooth surface finish. For this high volume manufacturing operation, process parameters have historically been selected conservatively using machining data handbooks or on a trial-and-error basis according to operator experience without explicit consideration of how the selected settings affect the productivity or cost of the operation. To improve operation efficiency, a science-based approach for selecting the optimum process parameters must be developed to replace traditional industrial practices. In this article, a methodology combining several analytical and experimental techniques is presented for optimizing the key process parameters in plunge centerless grinding of Inconel 718 and Ti-6Al-4V superalloy fasteners in two phases: (i) modeling of process constraints using experimental design and statistical regression, and (ii) determination of optimum grinding conditions in the feasible operating region using a simulation algorithm based on classical machining economics theory. The results show that the implementation of optimum material removal rates can lead to an appreciable reduction in the cost of the operation while satisfying the constraints imposed on the machine tool and the workpiece quality.
- 出版日期2012
