Mechanism of the crack propagation in the chip root in dry hard orthogonal turning of the hardened steel

doi:10.1016/j.ijmecsci.2018.02.020

CORC > 兰州理工大学 > 兰州理工大学 > 机电工程学院

	Mechanism of the crack propagation in the chip root in dry hard orthogonal turning of the hardened steel
	Tang, Linhu 1,2,4; Gao, Chengxiu 1,2; Shen, Hao 3; Lin, Xiaojun 1,2; Zhang, Ling 1,2
刊名	INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
	2018-04
卷号	138 页码:272-281
关键词	Hardened steel Serrated chip Crack-tip field Control equation Crack propagation angle Shear angle Formation mechanism
ISSN号	0020-7403
DOI	10.1016/j.ijmecsci.2018.02.020
英文摘要	Analytic model of the crack-tip field in the cutting tool tip located in the chip root in dry hard orthogonal turning (DHOT) of the hardened steel was established in this paper according to the metal cutting principle and fracture mechanics theory. The relationship between the crack inclination angle psi to the direction of the tensile stress a and the crack propagation angle theta(0) in I-II mixed model also was proposed. The control equation, displacement function, and boundary condition of crack dynamic propagation in the chip root were derived. The mathematical model for the relationship between the shear angle phi and the crack propagation angle theta(0) also was presented. Furthermore, formation mechanisms of the serrated chip in DHOT of the hardened steel Cr12MoV (40-60 +/- 1HRC) by utilizing the Polycrystalline Cubic Boron Nitride (PCBN) inserts were experimentally investigated. The results showed that the cutting speed and quenching hardness of workpiece have great influence on the crack propagation angle theta(0). The shear angles calculated by the mathematical model are basically in agreement with the experimental results. The thermal softening chip squeezed from the cutting tool rake face begins to shear and slip at high speed along the direction of the crack propagation angle theta(0) in the chip root and then the serrated chip forms. (C) 2018 Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[51465028]
WOS研究方向	Engineering ; Mechanics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000428825200023
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/32715]
专题	机电工程学院
通讯作者	Tang, Linhu
作者单位	1.Gansu Prov Univ, Prov Key Lab Green Cutting Technol & Applicat, Lanzhou Inst Technol, Lanzhou, Gansu, Peoples R China 2.Lanzhou Inst Technol, Coll Mechanoelect, Lanzhou, Gansu, Peoples R China 3.Lanzhou Univ Technol, Coll Mechanoelect, Lanzhou 730050, Gansu, Peoples R China 4.1 Gongjiaping East Rd, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Tang, Linhu,Gao, Chengxiu,Shen, Hao,et al. Mechanism of the crack propagation in the chip root in dry hard orthogonal turning of the hardened steel[J]. INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,2018,138:272-281.
APA	Tang, Linhu,Gao, Chengxiu,Shen, Hao,Lin, Xiaojun,&Zhang, Ling.(2018).Mechanism of the crack propagation in the chip root in dry hard orthogonal turning of the hardened steel.INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,138,272-281.
MLA	Tang, Linhu,et al."Mechanism of the crack propagation in the chip root in dry hard orthogonal turning of the hardened steel".INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 138(2018):272-281.