Size effect and tool geometry in micromilling of tool steel

Published on Oct 1, 2009in Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology3.108
· DOI :10.1016/J.PRECISIONENG.2008.11.002
Ampara Aramcharoen9
Estimated H-index: 9
(University of Manchester),
Paul T. Mativenga34
Estimated H-index: 34
(University of Manchester)
Sources
Abstract
The market for freeform and high quality microdies and moulds made of steel is predicted to experience a phenomenal growth in line with the demand for microsystems. However, micromachining of hardened steel is a challenge due to unpredictable tool life and likely differences in process mechanism compared to macro-scale machining. This paper presents an investigation of the size effect in micromilling of H13 hardened tool steel. In this case, the size effect in micromilling hardened tool steel was observed by studying the effect of the ratio of undeformed chip thickness to the cutting edge radius on process performance. The paper explores how this ratio drives the specific cutting force, surface finish and burr formation in micro-scale machining. In addition, the effect of different microend mill geometry on product quality was explored. The paper provides a valuable insight into optimum micro-scale machining conditions for obtaining the best surface finish and minimizing burr size.
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