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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 12    December 2020

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Mechanism of necking defect of 6082 aluminium alloy rolled by cross-wedge rolling method based on material thermal properties
WANG Dong-gang(王东钢)1, 2, 3, SHU Xue-dao(束学道)1, 3, WANG Rui(汪锐)1, 3, XU Sheng(徐生)1, 2

1. Faculty of Mechanical Engineering & Mechanics, Ningbo University, Ningbo 315211, China;
2. Institute of Mechanical and Electrical Engineering, Zhejiang Business Technology Institute,
Ningbo 315012, China;
3. Zhejiang Provincial Key Laboratory of Part Rolling Technology, Ningbo 315012, China

Abstract:Necking defects have long troubled the application of cross-wedge rolling technology in aluminium alloy shaft parts. To accurately predict necking defects, new judgement conditions are established based on the thermal performance of 6082 aluminium alloy. The limit-sectional shrinkage without necking defects is achieved by combining theoretical calculation and finite-element model analysis, which couples heat transfer and deformation. In this paper, a 6082 aluminium alloy extruded rod with a 40 mm diameter rolled at a preheated temperature of 500 °C and a rolling angular velocity of 1 rad/s is taken as an example. The simulation and experimental results show that necking defects do not occur on the rolled pieces if the sectional shrinkage is below the limit-sectional shrinkage but will occur when the sectional shrinkage is above it. The results prove that the prediction model of necking defects in cross-wedge rolling of 6082 aluminum alloy is feasible, and this research provides a theoretical basis for the qualified aluminum alloy shafts produced by the cross-wedge rolling.

 

Key words: 6082 aluminium alloy; cross wedge rolling; limit-sectional shrinkage; necking mechanism; temperature field

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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