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弯管成形理论和技术研究进展与发展趋势

弯管成形理论和技术研究进展与发展趋势

弯管成形理论和技术研究进展与发展趋势

弯管成形理论和技术研究进展与发展趋势

弯管成形理论和技术研究进展与发展趋势

弯管成形理论和技术研究进展与发展趋势

Contents lists available at ScienceDirect

Chinese Journal of Aeronautics

journal homepage: www.elsevier .com/locate/cja

弯管成形理论和技术研究进展与发展趋势

Chinese Journal of Aeronautics 25 (2012) 1-12

Advances and Trends on Tube Bending Forming Technologies

YANG He a,*, LI Heng a , ZHANG Zhiyong a , ZHAN Mei a , LIU Jing a , LI Guangjun b

a

State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical

University, Xi’an 710072, China

b

Chengdu Aircraft Industry (Group) Corporation Ltd., Chengdu 610092, China

Received 18 August 2011; revised 17 September 2011; accepted 23 September 2011

Abstract

As one kind of key components with enormous quantities and diversities, the bent tube parts satisfy the increasing needs for lightweight and high-strength product from both materials and structure aspects. The bent tubes have been widely used in many high-end industries such as aviation, aerospace, shipbuilding, automobile, energy and health care. The tube bending has become one of the key manufacturing technologies for lightweight product forming. Via the analysis of bending characteristics and multiple defects, advances on exploring the common issues in tube bending are summarized regarding wrinkling instability at the intrados, wall thinning (cracking) at the extrados, springback phenomenon, cross-section deformation, forming limit and process/ tooling design/optimization. Some currently developed bending techniques are reviewed in terms of their advantages and limitations. Finally, in view of the urgent requirements of high-performance complex bent tube components with difficult-to- deform and lightweight materials in aviation and aerospace fields, the development trends and corresponding challenges are presented for realizing the precise and high-efficiency tube bending deformation. Keywords: tube bending; forming; lightweight; high strength; defects; aviation; aerospace

1. Introduction

As one kind of key lightweight components for “bleeding” transforming and loading carrying with en- ormous quantities and diversities, metallic bent tubular parts have attracted increasing applications in many high-technological industries such as aviation (shown in Fig. 1), aerospace, shipbuilding, automobile, energy and health care since they satisfy the current needs for

*Corresponding author. Tel.: +86-29-88495632.

E-mail address: yanghe@http://www.doczj.com/doc/4b1f34cd4693daef5ef73df1.html

Foundation items: National Natural Science Foundation of China (50905144); State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology (09-10); NPU Foundation for Fundamental Research (JC201028); Fund of the State Key Laboratory of Solidification Processing in NWPU,

Natural Science Basic Research Plan in Shaanxi Province (2011JQ6004); “111” Project (B08040)

1000-9361/$ - see front matter © 2012 Elsevier Ltd. All rights reserved. doi: 10.1016/S1000-9361(11)60356-7

products with lightweight, high strength and high per- formance from both materials and structure aspects. To bend the tubular materials with certain bending radius, bending angle and shapes, the tube bending, one imp- ortant branch of the tubular plastic forming fields, has been a vital manufacturing technology for lightweight products urgently needed in the above industries [1-2]. Many tube bending approaches have been dev- eloped in response to the diverse demands of tube specification, shapes, materials and forming toler- ance [3-4]. According to the forming conditions, there are cold bending at room temperature and hot (heat) bending with elevated temperature. From the vie- wpoint o
f loading conditions, there are pure bending, compression bending, stretch bending, roll bending, rotary draw bending and laser bending. There are st- ainless steel tube bending, aluminum alloy tube be- nding, copper tube bending, magnesium alloy tube be- nding and titanium alloy tube bending in materials point of views. From aspects of tubular shapes, there

products with lightweight, high strength and high per- formance from both materials and structure aspects. To bend the tubular materials with certain bending radius, bending angle and shapes, the tube bending, one imp- ortant branch of the tubular plastic forming fields, has been a vital manufacturing technology for lightweight products urgently needed in the above industries [1-2]. Many tube bending approaches have been dev- eloped in response to the diverse demands of tube specification, shapes, materials and forming toler- ance [3-4]. According to the forming conditions, there are cold bending at room temperature and hot (heat) bending with elevated temperature. From the vie- wpoint of loading conditions, there are pure bending, compression bending, stretch bending, roll bending, rotary draw bending and laser bending. There are st- ainless steel tube bending, aluminum alloy tube be- nding, copper tube bending, magnesium alloy tube be- nding and titanium alloy tube bending in materials point of views. From aspects of tubular shapes, there

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