Abstract
In its broad definition, hard machining is machining of parts with a hardness of above 45 HRC, although most frequently the process concerns hardnesses of 58 to 68 HRC. The workpiece materials involved include various hardened alloy steels, tool steels, case-hardened steels, superalloys, nitrided irons and hard-chromecoated steels, and heat-treated powder metallurgical parts. It is mainly a finishing or semi-finishing process where high dimensional, form, and surface finish accuracy have to be achieved [1].
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Notes
- 1.
The property of being hard enough to cut metals even when heated to a dull-red color.
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Astakhov, V. (2011). Machining of Hard Materials – Definitions and Industrial Applications. In: Davim, J. (eds) Machining of Hard Materials. Springer, London. https://doi.org/10.1007/978-1-84996-450-0_1
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