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Zhu D.W.,Chongqing University | Zhu D.W.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | Huang Y.,Chongqing University | Huang Y.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | And 2 more authors.
Key Engineering Materials | Year: 2011

This paper aims at structure strength analysis which makes the static and dynamic analysis for the numerical control abrasive belt grinding machine from key components to the whole machine and obtains relevant data and conclusions. On the base of the original structure, according to the design requirements, the important parts of the grinding machine are simplified and mechanical analysis. According to the calculated results and the constraints of the machine, the mathematical modeling of key components and the limit position can be obtained by using the mathematical theory of mechanical optimization. According to the results, the entity model and static analysis can be finished. Finally, the static and modal analysis of the large grinding equipment can be carried on the FEA software and draw some important conclusions. © (2011) Trans Tech Publications. Source


Zhang M.,Chongqing University | Zhang M.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | Huang Y.,Chongqing University | Huang Y.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | And 2 more authors.
Key Engineering Materials | Year: 2011

Under the conditions of crankshaft uniform rotation, the schematic diagram of coordinate polishing crankpin was analyzed and found that the grinding time and speech changed, when the abrasive grinded crankpin. At the same time, the surface roughness was the relevant with the grinding time, grinding for a long time the roughness value was low, grinding time was short then the roughness value was high. In order to ensure that the surface roughness was homogeneity, so that the abrasive grinded the grinding point in the same time, in other words, the abrasive grinded crankpin in the constant velocity. And then the abrasive grinding crankpin was analyzed in the constant velocity, the crankshaft angle was draw the relationship between horizontal displacement and the swing angle. Simultaneity, adopted the level cylinder and the oscillating cylinder mutual moving, that resulted in the mechanism following the rotation of crankshaft back and forth movement, it was due to the weight of mechanism and the lag of the cylinder, and finally the mechanism of lag error was analyzed. © (2011) Trans Tech Publications. Source


Zhang M.,Chongqing University | Zhang M.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | Huang Y.,Chongqing University | Huang Y.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | And 2 more authors.
Key Engineering Materials | Year: 2012

Coordinate polishing technology with abrasive tap is targeted for crankshaft, camshaft, eccentric shaft and other complex surface polishing. In the process of coordinate polishing crankshaft crankpin with abrasive tap, the constant removal rate is to ensure accuracy rate of removal, which is very important factor. This article is to mainly analyze constant rate of removal. First, analyzing the movement model of a single abrasive and on the exact model and the constant speed along under the conditions of uniform rotation of the crankshaft still grinding the neck of a diagram analysis, we found that controlling the abrasive in constant linear speed and constant pressure under the crankpin can achieve constant rate of removal. Then, when the abrasive is moving with constant speed under the crankpin, we analyses on the laws of crankshaft rotation and institutions movement, and simulates the equation of motion, Those curves are no mutations and to meet the engineering requirements. Finally, in order to ensure coordinate polishing crankshaft crankpin with abrasive tap with the polishing block clamping force, that is constant pressure grounding, so coordinate institutions must be analyzed counter weight. Those curves are no mutations and to meet the engineering requirements. © (2012) Trans Tech Publications, Switzerland. Source


Zhang W.-W.,Chongqing University | Zhang W.-W.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | Guo G.,Chongqing University | Zhang Y.,Chongqing University | And 3 more authors.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2010

Belt grinding machine with multi-axis computer number control(CNC) system can effectively process parts with complex moulding surfaces. In this paper, iso-parametric and iso-planar tool path planning strategies customized for this kind of machine are proposed. The tool path generation methods are designed based on the analysis of the belt grinding process. By using least square method, optimized cross section normal is computed in the iso-planar method. To improve the design efficiency of path planning, reduce experiments and increase economical benefit, the geometric simulation program based on linear grinding model is developed. Experiment on a turbine blade profile shows that the proposed algorithms work satisfyingly. Source


Huang Y.,Chongqing University | Huang Y.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | Yang C.,Chongqing University | Yang C.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | And 2 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2011

Process tests of belt grinding for 304 stainless steel were conducted with two kinds of abrasive grains. The surface roughness and the surface topography of belt wear were observed. The influence of grinding time and normal grinding force on surface roughness were discussed. The wear mechanism of belt wear was revealed based on a model of abrasive grain's wear. The self-sharping processes of silicon carbide and zirconia were analyzed. It has been shown that surface roughness Ra values are rapidly deceased when grinding time is less than 8s. The Ra values seem to be independent of the roller's hardness when the grinding time is over 20s. The Ra values are deceased with normal grinding force increasing. The optimum surface roughness can be reached when the normal grinding forces are between 60N and 80N. Zirconia has a better ability of self-sharping and the wear process is dominated Passivation wear. Abrasive grains partial loss, larger wear small planes and serious cover wear are observed on silicon carbide abrasive grains. Source

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