Investigation of Size Effect on Micro Hardness of Machined Surface in Micro Cutting

Tao Zhang; Zhen Yu Shi; Bing Yan; Hou Jun Qi

doi:10.4028/www.scientific.net/AMM.602-605.443

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 602-605Investigation of Size Effect on Micro Hardness of...

Investigation of Size Effect on Micro Hardness of Machined Surface in Micro Cutting

Abstract:

Micro cutting is a promising way for manufacturing micro parts, especially micro three dimension parts. Micro hardness is an important character to evaluate surface integrity of machined surface. Micro cutting is different from macro cutting due to size effect of specific cutting energy because of the influence of the ratio of uncut chip thickness to cutting edge radius. A group of micro cutting experiments were conducted to investigate the cutting parameters on the micro hardness of machined surface. The micro hardness of machines surface decreases with the ratio of uncut chip thickness to cutting edge radius first, and then increase when the uncut chip thickness is smaller than the cutting edge radius. The micro hardness shows size effect due to the machined surface compressed twice with the round cutting edge. The micro hardness decreases with the distance increasing far away from the machined surface.