Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments

Chongqing, China

Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments

Chongqing, China
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Huang Y.,Chongqing University | Huang Y.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | Liu R.-J.,Chongqing University | Liu R.-J.,Chongqing Engineering Research Center for Material Surface Precision Machining and Whole Set Equipments | And 3 more authors.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2010

Abrasive belt grinding experiments of glass fiber reinforced plastics composite material are carried out by using three different abrasive belts with different sizes, and the interaction principle between the abrasive and the workpiece is analyzed. The main factors of material removal rate and belt life of glass fiber reinforced plastics composite material are obtained through a large number of tests and test data. The extent and the main reason of belt plug are analyzed through the professional image analysis software (Image-Pro Plus) for the first time. The results show that in the process of abrasive belt grinding, the material removal rate are affected by the factors for grinding pressure, belt speed, abrasive type and size, and the ceramic abrasive belt has the highest removal rate. The main factor for belt plug extent is grinding pressure. The most important wear form of abrasive belt is blunt, and the accumulation abrasive belt has the longest life, followed by ceramic abrasive belt.


Zhang L.,Chongqing University | Zhang L.,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 4 more authors.
Key Engineering Materials | Year: 2011

In order to get the crankshaft crankpin's surface shape errors and geometric dimension in real time, this paper presented an on-line follow-up tracing measurement method for measuring the roundness error and diameters of the crankshaft crankpin same time according with the characteristics of the crankshaft abrasive belt follow-up grinding process. After analyzing the movement control model of the follow-up tracing system, we obtained the constraint conditions which can fill the uniform sampling requirements of the sensor group. On this basis, we put forward the three-sensor follow-up tracing principle to separate the crankpin's roundness error and systematic error from the actual measurement data. According to the principle of DFT, the fundamental equations of the three-sensor tracing principle for the roundness error separation were deduced in details. It is testified by experiments that: the roundness error source can be obtained by analyzing the original data, then we can compensate the errors through the feedback control system, so as to achieve the objective of improving the crankshaft crankpin's roundness and the processing precision of the crankshaft crankpin. © (2011) Trans Tech Publications.


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.


Zhang Y.,Chongqing University | Zhang Y.,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

Surface roughness is one of the most important parameters in grinding, which directly affects the quality of the processed surface and has quite a lot of effect on the shape and position accuracy, installation accuracy of the workpiece. In the grinding process, the surface roughness is formatted from the abrasive which effects on the surface of spherical head, and is the result of mutual interference between abrasive and spherical head. Many factors affect the surface roughness, such as the shape and size of contact roller, abrasive morphology, grinding method, the stiffness of machine tool and workpiece, abrasive wear and vibration in the machining process. All of these have an impact grinding surface roughness. In this paper, analyzed the belt speed, workpiece speed, abrasive size, workpiece diameter, sand-planting density on the surface roughness of spherical head in experimental. And the effect trend of factors on surface roughness of workpiece was analyzed. Some valuable information was provided for selecting suitable parameter in spherical head grinding. © (2011) Trans Tech Publications.


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.


Lu Y.,Chongqing University | Lu Y.,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 4 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

The influences of abrasive belt granularity and different grinding parameters on grinding efficiency, workpiece surface quality and different effects of abrasive wear throughout the process of grinding Cu-nickel-aluminum bronze were analyzed herein. The processing tests were carried out by alumina oxide abrasive belts for grinding Cu-nickel-aluminum bronze in different abrasive belt speeds and grinding forces respectively, the amount of material removal rate, workpiece surface roughness and belt wear were measured. The results show that increasing abrasive belt speed and grinding force can increase the material removal rate and the wear ratio to some extents. With the grinding force increasing, the workpiece surface roughness increases. With the abrasive belt granularity increasing, the workpiece surface roughness decreases. When the abrasive belt speed is 25 m/s, the grinding force is 43 N and the abrasive belt granularity is 240, Cu-nickel-aluminum bronze grinding effects reach the best. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved.


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.


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.


Wu H.L.,Chongqing University | Wu H.L.,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 4 more authors.
Key Engineering Materials | Year: 2011

Blades are the key parts of the turbine, which usually use materials such as 1Cr13 stainless steel. These materials are of high strength, great toughness, and good thermo hardening, but the process is difficult. Abrasive belt grinding has good grinding performance. Grinding tests of three kinds of abrasive belts were carried out on 1Cr13 stainless steel; the relationship between the material removal rate and the species, such as abrasive belt type, belt speed, the normal grinding force, and grinding fluid, was studied; after the belt grinding, the microscopic morphology of the surface was analyzed by SEM, and it revealed that the differences of the micro structure and basic wear law of different abrasives. The results show that in the process of abrasive belt grinding, the ceramic abrasive belt has the highest material removal rate. The material removal rate of alumina and zirconium corundum abrasive belt reached the maximum when Vs is about 25m/s or so, and ceramic abrasive belt is stable to maintain high material removal rate when Vs is at the speed range of 28 to 32m/s. The material removal rate can be improved several times when using grinding fluid of butter. © (2011) Trans Tech Publications.


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.

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