PFMS (Precision Flexible Manufacturing System) Tool Characterization Study at Lawrence Livermore National Laboratory.

摘要

A tool characterization study was conducted as part of the modeling effort at LLNL in support of the Y-12 Enhanced T-base Project. The goal of the study was to identify tool error sources and measure their influence on the finish machining process of D-38 Hemi Shells. This paper outlines the procedures and results of this study. The condition of new carbide inserts used at Y-12 are examined including insert edge quality, geometry, and tool radius size and contour deviation. Test parts were cut on LLNL's Pneumo Precision T-Base lathe according to common Y-12 finishing procedures. Part profile and tool contour were measured before and after each cut. The effect of initial tool profile errors and tool wear during the cut are discussed as they relate to the finished part profile. Insert and part inspection procedures are covered in detail. The established tool wear patterns for both the .002'' and the .005'' depths of cut typically used at Y-12 are presented. Additional tool error source observations are also included. 22 figs.