材料强化因素对切削过程中尺寸效应的影响

中国机械工程 ›› 2012, Vol. 23 ›› Issue (5): 603-608.

材料强化因素对切削过程中尺寸效应的影响

叶贵根1,2;薛世峰1;仝兴华3;戴兰宏2

1.中国石油大学（华东）,东营,257061

2.中国科学院力学研究所非线性力学国家重点实验室,北京,100190

3.山东大学威海分校,威海,264209

出版日期:2012-03-10 发布日期:2012-03-21
基金资助:
国家重点基础研究发展计划(973计划)资助项目 (2009CB724401)；国家自然科学基金资助项目（11132011, 10725211, 11021262, 11002144）；“NSAF”联合基金资助项目（10976100）
National Program on Key Basic Research Project (973 Program)（No. 2009CB724401）;
National Natural Science Foundation of China（No. 11132011, 10725211, 11021262, 11002144）

Contribution of Material Strengthening to Size Effect in Metal Cutting Process

Ye Guigen1,2;Xue Shifeng1;Tong Xinghua3;Dai Lanhong2

1.Petroleum University of China, Dongying,Shandong, 257061

2.State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190
3.Weihai Branch of Shandong University, Weihai,Shandong, 264209


Online:2012-03-10 Published:2012-03-21
Supported by:

National Program on Key Basic Research Project (973 Program)（No. 2009CB724401）;
National Natural Science Foundation of China（No. 11132011, 10725211, 11021262, 11002144）

摘要/Abstract

摘要：

针对航天航空常用材料TiAl6V4的正交切削过程开展了一系列的有限元模拟,进行了相应的切削实验用以验证模拟的可靠性。基于系统的数值仿真,考察了切削过程中主次剪切区的平均应变、应变率、温度随切削厚度的变化规律,集中研究了材料应变、应变率强化及热软化因素对切削过程中“尺寸效应”现象的影响。研究结果表明,材料应变和应变率强化因素对“尺寸效应”没有太大影响,而材料热软化作用是导致“尺寸效应”形成的重要因素。另外,随着切削厚度的减小,主剪切区温度降低以及刀具和切屑间单位接触长度非线性增加是造成“尺寸效应”的主要原因。

关键词:

尺寸效应, 切削比能, 材料强化, 数值模拟

Abstract:

Finite element-based orthogonal cutting simulations were performed with titanium alloy TiAl6V4. The orthogonal cutting experiments were used to validate the numerical model. Based on the systemic simulation results, the dependences of strain, strain rate and temperature in the primary and secondary shear zone on the uncut chip thickness were investigated. The influences of material strengthening factors, including strain, strain rate and temperature effects, on the “size effect” in specific cutting energy were further discussed. The results show that, the strain and strain rate dependences of material flow stress have no effect on “size effect”, while the thermal-softening effect plays a dominant role in causing “size effect”. In addition, the “size effect” can be attributed to a drop in the primary shear zone temperature and an increase in the tool-chip contact length.

Key words: size effect, specific cutting energy, material strengthening, numerical simulation

中图分类号:

TG501

叶贵根1, 2, 薛世峰1, 仝兴华3, 戴兰宏2.

材料强化因素对切削过程中尺寸效应的影响

[J]. 中国机械工程, 2012, 23(5): 603-608.

XIE Gui-Gen-1, 2, XUE Shi-Feng-1, TONG Xin-Hua-3, DAI Lan-Hong-2.

Contribution of Material Strengthening to Size Effect in Metal Cutting Process

[J]. China Mechanical Engineering, 2012, 23(5): 603-608.

参考文献

[1]陈勇平[1],唐进元[1].磨削加工中的尺寸效应机理研究[J].中国机械工程,2007,18(17):2033-2036.
[2]Schimmel R J, Endres W J, Stevenson R. Applica- tion of an Internally Consistent Material Model to Determine the Effect of Tool Edge Geometry in Or- thogonal Machining[J]. Journal of Manufacturing Science and Engineering, 2002, 124: 536-543.
[3]Komanduri R, Chandrasekaran N, Raft L M. Effect of Tool Geometry in Nanometric Cutting: a Molecular Dynamics Simulation Approach [ J]. Wear, 1998, 219: 84-97.
[4]Nakayama K, Tamura K. Size Effect in Metal-- cutting Force[J]. Journal of Engineering for Indus- try, 1968, 90:119-126.
[5]Subbiah S, Melkot S N, The Constant Force Com- ponent Due to Material Separation and Its Contribu- tion to the Size Effect in Specific Cutting Energy [J]. Journal of Manufacturing Science and Engi- neering, 2006, 128: 811-815.
[6]Atkins A G. Modelling Metal Cutting Using Mod- ern Ductile Fracture Mechanics Quantitative Expla- nations for Some Long Standing Problems[J]. In- ternational Journal of Mechanical Sciences, 2003, 45: 373-396.
[7]Shaw M C. A Quantized Theory of Strain Harden- ing As Applied to the Cutting of Metals[J]. Journal of Applied Physics, 1950, 21: 599-606.
[8]Backer W R, Marshall E R, Shaw M C. The Size Effect in Metal Cutting [J]. The Transaction of ASME, 1952, 74: 61-74.
[9]Kopalinsky E M, Oxley P L B. Size Effects in Met- al Removal Processes[J]. Institute of Physics Con- ference Series, 1984, 70: 389-396.
[10]Oxley P L B. The Mechanics of Machining: an Analytical Approach to Assessing Machinability [M]. New York: Halsted Press, 1989.
[11]Liu K, Melkote S N. Material Strengthening Mechanisms and Their Contribution to Size Effect in Micro--cutting[J]. Journal of Manufacturing Science and Engineering,2006, 128:730-737.
[12]周泽华.金属切削原理[M].上海：上海科学技术出版社,1993.. 2
[13]王敏杰[1],段春争[1],刘洪波[1].正交切削切屑形成中绝热剪切行为的实验研究[J].中国机械工程,2004,15(18):1603-1606.
[14]Hortig C, Svendsen B. Simulation of Chip Forma- tion During High--speed Cutting[J]. Journal of Materials Processing Technology, 2007, 186: 66- 76.
[15]Zorev N N,Wallace P W,Boothroy G. Toll Forces and Tool--chip Friction in Orthogonal Machining [J]. Journal of Mechanical Engineering Science, 1964, 6: 422.
[16]Calamaz M, Coupard D, Girot F. A New Material Model for 2D Numerical Simulation of Serrated Chip Formation When Machining Titanium Alloy Ti--6Al-4V[J]. International Journal of Ma- chine Tools and Manufacture, 2008, 48: 275- 288.
[17]Merchant M E. Mechanics of the Metal Cutting Process I : Orthogonal Cutting and the Type 2 Chip[J]. Journal of Applied Physics, 1945, 16:267-275.