Distribution of contact loads over the flank-land of the cutter with a rounded cutting edge

International Conference on Mechanical Engineering, Automation and Control Systems 2015

机械制造;无线电电子学;计算机科学

Kozlov, V.^1 ; Gerasimov, A.^2 ; Kim, A.^1

Tomsk Polytechnic University, 30, Lenina ave., Tomsk

634050, Russia^1

Tomsk State University, 36, Lenina ave., Tomsk

634050, Russia^2

关键词: Chip formations;    Contact conditions;    Normal contacts;    Orthogonal turning;    Rounded cutting edges;    Specific contact;    Tangential contact;    Workpiece materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/124/1/012173/pdf
DOI  :  10.1088/1757-899X/124/1/012173

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

In this paper, contact conditions between a tool and a workpiece material for wear-simulating turning by a cutter with a sharp-cornered edge and with a rounded cutting edge are analysed. The results of the experimental study of specific contact load distribution over the artificial flank wear-land of the cutter in free orthogonal turning of the disk from titanium alloy (Ti6Al2Mo2Cr), ductile (63Cu) and brittle (57Cu1Al3Mn) brasses are described. Investigations were carried out by the method of 'split cutter' and by the method of the artificial flank-land of variable width. The experiments with a variable feed rate and a cutting speed show that in titanium alloy machining with a sharp-cornered cutting edge the highest normal contact load (σhmax= 3400...2200 MPa) is observed immediately at the cutting edge, and the curve has a horizontal region with the length of 0.2... 0.6 mm. At a distance from the cutting edge, the value of specific normal contact load is dramatically reduced to 1100...500 MPa. The character of normal contact load for a rounded cutting edge is different -it is uniform, and its value is approximately 2 times smaller compared to machining with a sharp-cornered cutting edge. In author's opinion it is connected with generation of a seizure zone in a chip formation region and explains the capacity of highly worn-out cutting tools for titanium alloys machining. The paper analyses the distribution of tangential contact loads over the flank land, which pattern differs considerably for machining with a sharp-cornered edge and with a rounded cutting edge.