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Yang S.-F.,Yanshan University | Zhao C.-C.,Yanshan University | Jia X.-D.,Yanshan University | Sun C.,CITIC Dicastal Wheel Manufacturing Co. | Dong G.-J.,Yanshan University
Suxing Gongcheng Xuebao/Journal of Plasticity Engineering | Year: 2012

Shaft part local forming is a material-saving and efficient precision plastic forming process.At present, upsetting process is used widely with regard to local forming of the slender rod-shaped blank.For forging deformation ratio of length to diameter ω>2.5, the fittings are prone to fold by one upsetting process step, and need multiple top-upsetting process steps to complete the workpiece.Based on this, this paper first proposed a new technology called local forming process of floating die combining free upsetting, extrusion and closed die forging, which could avoid part bending fold and reduce tensile stress on forming surface.The local forming process of floating die achieved the slender rod-shaped deformation ratio length ω>4 with one-heating forming.Thus a series of issues in the existing process could be solved and also a new way for the local precision forming of the slender rod-shaped blank was derived. Source

Zhang X.,Yanshan University | Zhu H.,University of Wollongong | Huang W.,Yanshan University | Shi B.,CITIC Dicastal Wheel Manufacturing Co. | Tieu A.K.,University of Wollongong
International Journal of Materials and Product Technology | Year: 2013

A new method of setting continuous bending and straightening strain rate according to temperature subzone was brought forward. By making use of the high temperature creep character effectively during the continuous casting slab being straightened, a new model curve of continuous caster was developed. And by using theoretical and finite element method the strain and strain rate of the slab under multi-point straightening and the new continuous straightening were analysed. The result shows that for continuous straightening the strain rate of the slab is constant and lower than that of the slab under multi-point straightening, and the strain varies linearly. It is verified that the new continuous straightening technology is reasonable and superior. Copyright © 2013 Inderscience Enterprises Ltd. Source

Zhao W.M.,Hebei University of Technology | Jia X.F.,Hebei University of Technology | Wang Z.F.,Hebei University of Technology | Yin Z.G.,CITIC Dicastal Wheel Manufacturing Co. | Xiong G.Y.,CITIC Dicastal Wheel Manufacturing Co.
Advanced Materials Research | Year: 2011

The tube-shaped parts of A356 alloy were deformed from 0% to 83% by spinning process. The microstructure and mechanical properties of A356 alloy were discussed. The results showed that as the wall thickness reduction increases, the dendrite cells of cast alloy are lengthened gradually and the average Secondary Dendrite Arm Spacing (SDAS) is reduced from 37.2μm to 23μm and eutectic silicon particles are distributed orderly along the spinning direction. The coarse acicular β-Al5FeSi is broken into many sections, and its length is reduced from 37.5μm to 12.5μm in the cross-section. The tensile strength and elongation exhibit a strong dependence upon the variation in wall thickness, with a parabolic relationship. The tensile fractured surface of parts with deformation ratio above 35% exhibits many equiaxial dimples, with intergranular ductile fracture mode. © (2011) Trans Tech Publications. Source

Zhao W.M.,Hebei University of Technology | Zhang L.,Hebei University of Technology | Wang Z.F.,Hebei University of Technology | Yan H.J.,CITIC Dicastal Wheel Manufacturing Co.
Advanced Materials Research | Year: 2011

This paper studied the effects of inclusion and slag on properties of a die cast A356 alloy wheel. The result showed that the rate of defect is important for the mechanical properties. The tensile strength and extension was not dropped but the rate of defect is increased about 2%. The variation trend of tensile strength and extension is linear, while the area of porosity on tensile fracture is between 2% and 6%. However, the tensile strength and extension was dropped with the increasing rate of defect. The variation trend of mechanical properties of the sample with inclusion is stable, but the sample with slag is not stable. The mechanical properties of samples with inclusion are drastically changed, while the rate of defect is increased. The mechanical properties of samples with slag are smoothly. The EDS analysis indicated that the defects consist of Al-Ti-B compound, α-phase (Al12FeSi), β-phase (Al9Fe2Si2) and Al2O3. These oxides form the compact composite oxide film expand into first cracks. The fracture mode of sample with defects is brittle fracture. The values of the Secondary dendrite arm spacing (DAS) in the inclusion and the matrix are the same, while the values of DAS in the slag and the matrix are different. © (2011) Trans Tech Publications. Source

Zhu Z.,Yanshan University | Sun H.,Yanshan University | Hu J.,Yanshan University | Wang Y.,Yanshan University | Xiao Z.,CITIC Dicastal Wheel Manufacturing Co.
2010 International Conference on Mechanic Automation and Control Engineering, MACE2010 | Year: 2010

The simulation was carried out on the forging process of 6061 Aluminum Alloy wheels in this paper. The feasibility was demonstrated. The location and shape of the defection were predicted accurately. The forging simulation has many benefits, such as providing a guidance for the mould design and the process setting, improving the quality of the product, shortening the testing period of the product, increasing general product efficiency, saving the testing cost, decreasing the frequencies of mould reparing and creating significant economic profits etc. The necessary condition was provided by the forging of the aluminum alloy wheels to realize high strengh and lightweight of wheels. ©2010 IEEE. Source

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