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Zhang X.,Northeastern University China | Geng D.,Northeastern University China | Li P.,Liaoning Zhongwang Group Co. | Wang P.,Northeastern University China | And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

According to flow stress-strain curves of AZ31 magnesium alloy, the material model of AZ31 magnesium alloy was established, and the backward extrusion process of AZ31 magnesium alloy thin-wall tubes was simulated by the Deform-3D software. The distribution of temperature field, damage factor and velocity of internal billet and tube were analyzed in extrusion process. Effects of extrusion temperature, extrusion speed and die angle on peak temperature, effective stress, velocity and maximum extrusion force were discussed. The results show that the optimized technological parameters such as extrusion temperature, extrusion speed and die angle of backward extrusion AZ31 magnesium alloy thin-wall tubes reach 310 ℃, 1 mm/s and 60 °, respectively. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.


Wang X.,Northeastern University China | Ma Q.,Northeastern University China | Ma Q.,Liaoning Zhongwang Group Co. | Sun G.,Northeastern University China | And 2 more authors.
8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8 | Year: 2013

The ingots cast by DC casting process are usually extruded into aluminum bars. When the final products do not require high intensity, this process appears to be low efficiency and high cost. In order to simplify production procedure, increase the production efficiency and reduce the cost, we try to design a new technology to cast aluminum bar by horizontal direct chill (HDC) casting process directly. An electromagnetic field is applied during the horizontal continuous casting of 6061 aluminium alloy bar with the diameter of 30mm process. The experimental results show that the electromagnetic field is helpful for making the sump shallow and refining the structure near ingot surface, and the feather grain near ingot center during the conventional HDC casting process is converted into fine columnar grain when electromagnetic field is applied. With the increasing of current density, the solidification structures near the ingot surface and center are further refined.


Gao M.,General Research Institute for Nonferrous Metals, China | Zhang Z.,General Research Institute for Nonferrous Metals, China | Xu J.,General Research Institute for Nonferrous Metals, China | Feng J.,General Research Institute for Nonferrous Metals, China | Gai H.,Liaoning Zhongwang Group Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

It is radically important to eliminate lots of defects such as unstable mechanical properties, stripes and wrinkles surface, and low production yield of 7N01 aluminum profile by achieving uniformly fine solidification structure in DC casting billets. Effects of the annular electromagnetic stirring on the solidification structure of the 7N01 alloy continuous cast billet were investigated. The results indicate that with the annular electromagnetic stirring, the grain size of the 7N01 continuous cast billet with φ310 mm in diameter is refined to 200-300 μm, which is 10% of the conventional DC cast billet. Meanwhile, the grain size is decreased from 800-3200 μm to 200-300 μm with the obvious improvement of the homogeneity of the solidification structure. At the same time, the casting defects such as the feather crystals occurs in the normal DC casting process can be eliminated. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.


Trademark
Liaoning Zhongwang Group Co. | Date: 2005-09-27

Aluminum and its alloys; metal, laths; copper and its alloys.


Hou W.-R.,University of Science and Technology Beijing | Zhang Z.-H.,University of Science and Technology Beijing | Xie J.-X.,University of Science and Technology Beijing | Ma Q.-M.,Liaoning Zhongwang Group Co. | Gai H.-T.,Liaoning Zhongwang Group Co.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

The reverse point tracking method was used to study the reason and influence factors of the temperature inhomogeneity on the cross section of Al alloy hollow profile. The results show that the temperature change in dividing process has a great effect on the temperature inhomogeneity on the cross section of the profile, while the effects of temperature change on the temperature inhomogeneity on the cross section of the profile in welding chamber and die hole are smaller. The influence extent of heat transfer during the extrusion on the temperature inhomogeneity on the cross section of the profile from large to small is friction heat deformation heat, and the heat transfer between the metal and die. By using the die structure design and the rationalization of extrusion parameters, the temperature inhomogeneity on the cross section of hollow profile is greatly improved. ©, 2015, Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals. All right reserved.

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