With the increase in computer-controlled hybrid machining (e.g., mill-turn machining), one needs to discern what features of a part are created during turning (i.e., with a lathe cutter) versus those created by milling. Given a generic part, it is desirable to extract the turnable and nonturnable features in order to obtain feasible machining plans. A novel approach for automating this division and for defining the resulting turning operations in a hybrid process is proposed in this paper. Given a mill-turn part, the algorithm first identifies the dominant rotational-axis in order to quickly generate the axisymmetric “as-lathed” model. This model is then subtracted from the original part to isolate the nonturnable features. Next, the as-lathed model is translated to a label-rich graph, which is fed into a grammar reasoning algorithm to produce feasible turning sequences. During the turning process planning, the knowledge encapsulated in the design tolerances is used to guide the generation of feasible turning sequences. Two case studies are provided to explain the details of our algorithm. One of the suggested turning plans is compared with a manually proposed plan from an expert machinist and the results show the optimality of our plan in satisfying the prescribed tolerances.
Automatic Reasoning for Defining Lathe Operations for Mill-Turn Parts: A Tolerance Based Approach
Contributed by the Design for Manufacturing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received October 17, 2013; final manuscript received August 4, 2014; published online October 20, 2014. Assoc. Editor: Rikard Söderberg.
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Fu, W., Eftekharian, A. A., Campbell, M. I., and Kurtoglu, T. (October 20, 2014). "Automatic Reasoning for Defining Lathe Operations for Mill-Turn Parts: A Tolerance Based Approach." ASME. J. Mech. Des. December 2014; 136(12): 121701. doi: https://doi.org/10.1115/1.4028275
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