Experimental study on cutting temperature and cutting force in dry turning of titanium alloy using a non-coated micro-grooved tool

• Published in: International journal of machine tools & manufacture Vol. 73; pp. 25 - 36
• Main Authors: Xie, J., Luo, M.J., Wu, K.K., Yang, L.F., Li, D.H.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-10-2013
• Subjects: Chips; Cutting force; Cutting temperature; Cutting tool materials; Dry turning; Drying; Micro-grooved tool; Rakes; Titanium alloy; Turning; Turning (machining); Titanium alloy; Dry turning; Cutting temperature; Micro-grooved tool; Cutting force
• ISSN: 0890-6955; 1879-2170
• DOI: 10.1016/j.ijmachtools.2013.05.006

Various non-coated micro-grooves with 7–149μm in depth and 0.14–0.50 in aspect ratio are proposed on tool rake surfaces along cutting chip flowing. The objective is to understand how the micro-groove shape and size influence cutting temperature and cutting force in dry turning of titanium alloy. First, the micro-grinding with a diamond wheel V-tip was employed to fabricate accurate and smooth micro-grooves; then dry turning experiments were performed with regard to material removal rate; finally, cutting temperature, cutting force and tool wear were investigated. It is shown that these micro-grooves patterned on tool rake surface contribute to decreasing cutting chip frictions and excluding cutting heat. The micro-grooved tool decreases cutting temperature by 103°C and more against traditional plane tool. The predicted cutting tip temperature reaches about 1322°C for traditional plane tool, but it does only about 500°C for micro-grooved tool. Moreover, the cutting temperature decreases and the shear angle increases with decreasing micro-groove depth except for the case of 7μm in micro-groove depth. The 25-μm-depth micro-grooved tool decreases cutting temperature and cutting force more greatly in larger material removal rate turning. In the dry turning with a micro-grooved tool, it is required that the micro-groove width is less than cutting chip width and its aspect ratio is enough large to maintain the air spaces between chip back surface and tool rake surface.
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•The micro-grinding may be used to fabricate accuracy and smooth micro-grooves on tool rake surface.•The micro-grooved tool may decrease cutting temperature by 103° and more against plate tool.•The 25-μm-depth micro-grooved tool decrease cutting temperature and force more greatly in larger material removal rate turning.•The micro-groove depth and width influence cutting temperature and force.