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Zhang X.H.,Guangxi University | Su G.C.,Guangxi University | Han Y.Y.,Guangxi Yuchai Machinery Co. | Ai X.H.,Guangxi University | Yan W.L.,Guangxi University
Materials Science and Engineering A | Year: 2010

The mechanical properties of Al-Mg-Si cast alloys with different chemical compositions were investigated using an orthogonal test method. The optimized chemical compositions of Al alloy are given in wt% as follows: 7.0%Si-0.35%Mg-2.0%Cu-0.2%Mn-0.2%Ni-0.1%V-0.8%RE-89.35%Al. The optimized Al-Mg-Si alloy with metal mold casting had excellent mechanical properties. The softening resistance of the optimized alloy was better than that of ZL101 at elevated temperatures. The scanning electron microscopy fractographs of the tensile samples of ZL101 and optimized Al alloy at different magnifications revealed that all the specimens were fractured in a ductile manner, consisting of well-developed dimples over the entire surface. The alloys failed in a mixed-mode fracture, comprised predominantly of transgranular shears and a small amount of quasi-cleavages. © 2010 Elsevier B.V. Source

Wang C.-F.,Guangxi Yuchai Machinery Co. | Shen Q.-W.,Technology Wuhan Binhu Mechanical and Electrical Co.
Zhuzao/Foundry | Year: 2011

The workflow of rapid prototyping technology was reviewed. The process of making K10 cylinder head complete set of sand core by selective laser sintering rapid prototyping equipment was presented, by which the development period of new product was shorten. The cylinder heads were produced successfully with uniform wall thickness, cleaned cavity, and without sintering, shrinkage or dispersed shrinkage defects, which meet the technological requirements. Source

Liu C.-L.,Guangxi Yuchai Machinery Co.
Zhuzao/Foundry | Year: 2011

The slagging often occurs on cupola's tuyeres during the melting of compacted graphite cast iron; the tuyeres in the upper row even were blocked, and the coke in the hearth in the area below the upper row of tuyeres was burned empty. To solve the problems above, the reason of slag formation was analyzed from aspects such as the addition amount and kind of flux, cupola wall effect, balance control of wind and coke, etc. The result indicates that the slagging can be decreased effectively through adjusting the angle of tuyeres in the lower row, blast volume and cleaning the tuyeres in time. Source

Lin Z.,Guangxi Yuchai Machinery Co. | Wang T.,Tianjin University | Nan G.,Tianjin University | Zhang R.,Tianjin University
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2014

In order to obtain three-dimensional data of engine cylinder head blank, a passive line structured light canning measurement system is designed. Calibration of the direction cosine of the movement of camera optical center is given based on principle of virtual binocular stereo vision. Stereo vision system consists of a single camera moving along the one-dimensional rail, which gives Rotation matrix R and Translation vector T between local coordinate system and global coordinate system. And then the origin of local coordinate system is conversion to the global coordinate system so that the line of movement of camera along the rail is fitted and its direction cosine is calculated. Three-dimensional topography of a certain cylinder head is scanned and the cloud data on this topography is obtained, from which the data of Intake port center coordinates is extracted. Finally, the three-dimensional data is dealt with reverse engineering software and surface reconstruction works well. Source

Shengjun L.,Huazhong University of Science and Technology | Wei Z.,Huazhong University of Science and Technology | Yuancai L.,Huazhong University of Science and Technology | Siyi T.,Guangxi Yuchai Machinery Co. | Wenqing W.,Huazhong University of Science and Technology
China Foundry | Year: 2011

In this study, the 24 h tensile strength of new type acetone-urea-formaldehyde furan resin (nitrogen content 3%) was investigated by uniform design optimization. Four independent variables such as acetone: formaldehyde molar ratio (mol/mol), solution pH value, reaction temperature (°C) and reaction time (min) were considered in the experiments. U*13(134) uniform design was employed and the equation of 24 h tensile strength model was obtained after 13 experimentations. The 24 h tensile strength was optimized by applying single factor experiments and stepwise non-linear regression analysis. Minitab (Minitab 15 trial version) and MATLAB (R2010a trial version) were used for data analysis. The t-value and p-value indicate that the major impact factors include the interaction effect of solution pH value and reaction temperature (X2X3), the linear terms of acetone: formaldehyde molar ratio (X1), reaction time (X4) followed by the square effects of acetone/formaldehyde molar ratio (X1X1). The optimized results were achieved with the acetone: formaldehyde molar ratio (mol/mol) at 3:1, solution pH value at 6.0, reaction temperature at 70 °C, and reaction time at 140 min, respectively. This method can not only significantly reduce the number and cost of the tests, but also provide a good experimental design strategy for the development of furan resin. The investigation shows that the predicted results of 24 h tensile strength are consistent well with the experimental ones. Source

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