文献类型：期刊文献

英文题名：Geometry features of breakage section and variation of cutting force for end mills after brittle breakage

作者：Liu, Can[1];Wu, Jing-quan[1];Liu, Huan-lao[1];Li, Guang-hui[1];Tan, Guang-yu[1]

机构：[1]Guangdong Ocean Univ, Engn Coll, Zhanjiang 524088, Canton, Peoples R China

年份：2016

卷号：84

期号：5-8

起止页码：1345

外文期刊名：INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000376463300050)、、EI(收录号：20153801289906)、Scopus(收录号：2-s2.0-84941729384)、WOS

基金：The authors acknowledge the National Natural Science Foundations of China (51375099, 51375100) for their supports.

语种：英文

外文关键词：End mills; Brittle breakage; Section; Cutting force; Mathematical expression; Experiment

外文摘要：Some broken end mills with many brittle breakage sections were collected, and the geometry features of these sections were summed up. As for minor breakage, the breakage sections were narrow planes parallel to the tool edge, and the depths of breakage were shallow. As for severe breakage, it likely occurred near the edge tip; its breakage sections were approximate planes perpendicular to the bottom of tool and tilted approximately 35 degrees to the bottom edge; moreover, the broken degree of section side near the rake face was heavier, while that near the flank face was slighter. By taking these geometry features into account, mathematical instantaneous expressions of cutting force for broken end mills were amended correspondingly. Then, with these expressions, it could be analyzed that, on one hand, the amount of material removed by broken edge segment declined and, on the other hand, its coefficient of cutting force rose; therefore, the instantaneous cutting force might be in reverse relation with broken degree, and in positive relation with feed, and also the removed material by the tooth following the broken one would rise. These results indicate that, if a tooth is brittle broken, there exist two kinds of possibility as rise and decline for its cutting force-the cutting force of slightly broken tooth would rise, while that of heavily broken tooth would decline, the cutting force of tooth following the broken one would always rise, and that of other teeth would remain the same. Using artificial tooth breakage, cutting tests of broken end mills were taken; the test results agreed with above conclusions. Conclusions of this study may be used in modifying indices of monitoring brittle breakage for end mills.