Research on the dynamic mechanical characteristics and turning tool life under the conditions of excessively heavy-duty turning

doi:10.1007/s11465-012-0303-x

Front Mech Eng

2012, Vol. 7

Issue (3) : 329-334 https://doi.org/10.1007/s11465-012-0303-x

RESEARCH ARTICLE

Research on the dynamic mechanical characteristics and turning tool life under the conditions of excessively heavy-duty turning

Genghuang HE(

), Xianli LIU, Fugang YAN

The Key Laboratory of Advanced Manufacturing Technology & Cutting Tools, Harbin University of Science and Technology, Harbin 150080, China

Download: PDF(550 KB) HTML
Export: BibTeX | EndNote | Reference Manager | ProCite | RefWorks

Abstract

The dynamic mechanical characteristics of excessively heavy-duty cutting were analyzed based on the cutting experiments with 2.25Cr-1Mo-0.25V steel used in hydrogenated cylindrical shells. By investigating the influence of dynamic mechanical characteristics on the tools’ failure in limited heavy-duty cutting processes, the model of dynamic shearing force in the cutting area was established. However, the experimental results showed that the dynamic shear flow stress in the cutting area greatly influenced the tools’ fatigue. The heavy-duty cutting tool was damaged in the form of a shearing fracture. Through a comprehensive analysis of the theory, the critical condition of the tools’ fracture under extreme loading was established.

Keywords extreme loading cutting shear flow stress dynamic cutting force fatigue fracture

Corresponding Author(s): HE Genghuang,Email:sweetspyhgh@126.com

Issue Date: 05 September 2012

Cite this article:

Xianli LIU,Fugang YAN,Genghuang HE. Research on the dynamic mechanical characteristics and turning tool life under the conditions of excessively heavy-duty turning[J]. Front Mech Eng, 2012, 7(3): 329-334.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-012-0303-x
https://academic.hep.com.cn/fme/EN/Y2012/V7/I3/329

Fig.1 Schematic diagram of the deformation of the cutting area in an excessively heavy-duty cutting process

Fig.2 Finite element analysis of the excessively heavy-duty turning process. (a) Simulation analysis of the cutting; (b) shear stress distribution in the cutting deformation zone

Tab.1 Mechanical properties and chemical constituents of the materials for the cutting test

Fig.3 Excessively heavy-duty turning tool of composite coating. (a) Rake face of XF8 tool; (b) bottom of XF8 tool

Tab.2 Selection of the geometry and cutting parameters of the XF8 tool

Fig.4 Broken tools in the excessively heavy-duty turning test. (a) Broken tool under a low speed condition; (b) broken tool under a moderate speed condition; (c) broken tool under a moderate-high speed condition; (d) broken tool under a super high speed condition

Fig.5 Effect of cutting temperature on shear flow stress. (a) 2.25 Cr-1 Mo-0.25V steel; (b) 45 steel

Fig.6 Analysis of shear stress at the crack tip on the machining region of the turning tool. (a) Crack region along the flank of a heavy-duty turning tool; (b) analysis of shear stress at the crack tip on the turning tool

Fig.7 State of fracture failure of excessively heavy-duty turning tool. (a) Serious fracture of side-cutting edge; (b) fracture extends from the tip to both sides the tool evenly

1	Yang S, Tang H L. Machine Dynamics. Beijing: China Machine Press, 1985, 25–27 (in Chinese)
2	Liu P D. New Developments in Mechanics of Cutting. Dalian: Dalian University of Technology Press, 1991, 14–15 (in Chinese)
3	Kececioglu D. Shear-strain rate in metal cutting and its effects on shear-flow stress. ASME (B) , 1985, 80: 158–165
4	Stevenson M G, Oxley P L B. An experimental investigation of the influence of strain-rate and temperature on the flow tress properties of a low carbon steel from hot machining tests. Institution of Mechanical Engineers , 1973, 187: 263–272 doi: 10.1243/PIME_PROC_1973_187_025_02
5	Sha A X, Li X W, Wang Q R. The influence the heat distortion temperature has on both the microstructure and mechanical property of TC18 titanium alloy. Chinese Journal of Nonferrous Metals , 2008, 15(8): 1167–1168 (in Chinese)
6	He G H, Liu X L, Yan F G, Zhai Y S, Zhao Z Y. Research on the fracture and breakage of heavy-duty turning tool for rough machining hydrogenated cylindrical shell. Solid State Phenomena , 2011, 175: 305–310 doi: 10.4028/www.scientific.net/SSP.175.305
7	He G H, Liu X L, Yan F G, Hai Y S Z, Li M. Research on the application and design of special tools of the hydrogenated cylindrical shell. Advanced Materials Research , 2011, 188: 450–453 doi: 10.4028/www.scientific.net/AMR.188.450
8	Wang M J. Research on the orthogonal cutting process of metal dynamic mechanical property and thermoplastic shear instability. Dissertation for the Doctoral Degree . Dalian: Dalian University of Technology, 1988, 20–21 (in Chinese)

Viewed

Full text

Abstract

Cited

Shared

Discussed