共查询到20条相似文献,搜索用时 31 毫秒
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研究了树脂结合剂金刚石砂轮修整过程中修整力与修整效果的关系,基于修整力的变化表征了砂轮的表面形貌及磨削性能。首先,对碳化硼、碳化硅、白刚玉3种砂轮修整工具进行实验,并采集了修整过程中修整力的变化;然后,利用白光干涉仪观测修整后砂轮的表面形貌;最后,对修整后砂轮进行磨削验证实验,得到不同修整工具修整后砂轮的磨削性能。基于上述实验,分析并验证了修整力的变化与砂轮表面形貌和砂轮磨削性能的关系。结果表明,法向力Fn能够表征砂轮的磨粒切削刃密度以及磨粒突出高度;修整比率β反映了砂轮的锋锐程度,当β稳定时,砂轮达到充分修整。因此修整力反映了砂轮表面形貌和磨削性能,根据修整力的变化可以把握砂轮的修整进程。 相似文献
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Abdolhamid Azizi Seyed Mehdi Rezaei Abdolreza Rahimi 《The International Journal of Advanced Manufacturing Technology》2010,47(9-12):1053-1063
A systematic research is conducted to investigate the effect of rotary cup dressing on vitrified cubic boron nitride grinding performance in grinding of nickel-based superalloys. Grinding performance is evaluated mainly in terms of specific grinding energy and radial wheel wear. The number of active grits per unit area and their slope is considered as the two grinding wheel topographical key parameters for studying grinding performance. Cup dressing conditions with various speed ratios and overlap factors were investigated. In each case, the specific grinding energy and the radial wheel wear were experimentally measured, and then the effect of changing dressing parameters on the grinding performance is analyzed. To provide a view on how various parameters influence specific energy and the importance of wheel topography and grit workpiece interaction, a new specific grinding energy model is developed. Inputs to this model are workpiece parameters, grinding process parameters, and, in particular, the grinding wheel topographical parameters. This model is validated by experimental results. The theoretical values considering the complexity of the grinding process reasonably compare with the experimental results. The effect of number of active grits per unit area and their slope on specific grinding energy and then metal removal mechanism is investigated. The results revealed that the number of active grits per unit area has less effect on specific grinding energy than grits slope. 相似文献
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A degree of sharpness in wheel grains affects the surface roughness and dimensional accuracy in the grinding process. If a
wheel with dull grains is used, the grinding force is increased and the surface roughness is deteriorated. In ovder to produce
a precision component economically, the magnitude of the wear amount in the grinding wheel has to be limited. In this study,
experimental evaluation of a wheel life varying with the grinding ratio and static grinding force was conducted. The grinding
ratio and grinding force were measured to seek the grinding performance of the WA wheel. The relationship between the grinding
ratio and static grinding force was presented. 相似文献
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Indraneel Biswas A. Senthil Kumar Mustafizur Rahman 《The International Journal of Advanced Manufacturing Technology》2010,50(9-12):931-940
Profile accuracy of components ground with ultra-precision machine tools is primarily dependent on wheel wear. Quantitative analysis of wheel wear is therefore an important aspect for precision grinding with electrolytic in-process dressing (ELID). In this paper, wheel wear is measured from ELID grinding experiments with different dressing and machining parameters. The grinding forces and dressing current characteristics of the experiments are also compared. Based on the results, a benchmark function is defined for wheel wear rate. A relation for identifying insufficient dressing from sufficient dressing for particular machining conditions is also identified. It is found that insufficient dressing produces pitting and/or arcing on the wheel surface, and wheel wear can be linearly correlated to ELID grinding conditions when the wheels are sufficiently dressed. 相似文献
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通过合理划分超声振动修整系统,计算出超声振动修整砂轮系统的各个子系统机械阻抗,运用机械阻抗综合法求出系统的共振频率,为实验中寻求系统的谐振点提供了理论依据.并且提出修整瓦的尺寸对系统的谐振频率影响不大,从而简化修整瓦的设计. 相似文献
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The surface relief formed in deep grinding of VT8 titanium-alloy blanks with and without constant dressing of the grinding wheel is considered. Microphotographs of characteristic sections are shown, and the results of chemical analysis are presented. 相似文献
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To investigate the interaction between a laser beam and the bronze substrate in pulsed laser dressing of bronze-bonded diamond abrasive grinding wheels, a two-dimensional, transient numerical model of the three-phase (solid–liquid–gas) coupling in single-pulse laser ablation of the bronze was developed. The model accounts for the heat transfer, solidification, melting and vaporisation processes; the latent heat mechanism of the phase changes; and various critical factors such as surface tension, the vaporisation-induced recoil force, the thermal buoyancy force, and Darcy friction. The phase-field method is used to accurately track the development of the liquid/vapour (L/V) interface in the ablation crater. The finite element analysis software COMSOL Multiphysics was used to calculate the internal temperature field of the bronze substrate, the velocity field in the metallic vapour zone, and the evolution of the shape of the ablation crater during single-pulse laser ablation with various average laser power levels. The maximum error between the experimental results and the numerical analysis was less than 5%, which shows that the results are consistent. This model can accurately simulate the dynamic behaviour of the crater L/V interface during single-pulse laser ablation. This study provides a theoretical foundation for further research on laser dressing technology for bronze-bonded diamond grinding wheels. 相似文献
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Zhenzhong Zhang Peng Yao Zhiyu Zhang Donglin Xue Chong Wang Chuanzhen Huang Hongtao Zhu 《The International Journal of Advanced Manufacturing Technology》2017,93(9-12):3063-3073
The dressing of metal-bonded diamond grinding wheels is difficult despite their availabilities on hard and brittle materials. In this paper, a novel compound technology that combines abrasive waterjet (AWJ) and touch truing is proposed for dressing metal-bonded diamond grinding wheel precisely and efficiently. The dressing experiments of a coarse-grained and a fine-grained bronze-bonded diamond grinding wheel were carried out on a surface grinder with a developed AWJ system. The feasibility of this method was verified by analyzing the wheel runout, the truing forces, and the wheel surface topography. The variations of 3D surface roughness of wheel surface topography during the compound dressing process were quantitatively analyzed. The mechanism of AWJ and touch compound dressing is also discussed. Further, a reaction-bonded silicon carbide block was ground to validate the dressing quality. The experiment results indicate that the grinding wheels that were well dressed by the proposed technique leads to a smaller grinding force and a smaller surface roughness than that of undressed wheels. 相似文献
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A mathematical model is developed for the grinding force in cylindrical plunge grinding that allows for the grinding conditions, the size of the flank wear land areas formed on the grinding wheel cutting grains, the properties of the work material, and the geometrical parameters of the grinding tool and work surface. A formula is obtained for calculating the stock removal rate as a function of the degree of dulling (glazing) of the grinding wheel. The adequacy of the mathematical model of the grinding force in cylindrical plunge grinding is established. 相似文献
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On-machine precision preparation and dressing of ball-headed diamond wheel for the grinding of fused silica 总被引:1,自引:0,他引:1
In the grinding of high quality fused silica parts with complex surface or structure using ball-headed metal bonded diamond wheel with small diameter,the existing dressing methods are not suitable to dress the ball-headed diamond wheel precisely due to that they are either on-line in process dressing which may causes collision problem or without consideration for the effects of the tool setting error and electrode wear.An on-machine precision preparation and dressing method is proposed for ball-headed diamond wheel based on electrical discharge machining.By using this method the cylindrical diamond wheel with small diameter is manufactured to hemispherical-headed form.The obtained ball-headed diamond wheel is dressed after several grinding passes to recover geometrical accuracy and sharpness which is lost due to the wheel wear.A tool setting method based on high precision optical system is presented to reduce the wheel center setting error and dimension error.The effect of electrode tool wear is investigated by electrical dressing experiments,and the electrode tool wear compensation model is established based on the experimental results which show that the value of wear ratio coefficient K’ tends to be constant with the increasing of the feed length of electrode and the mean value of K’ is 0.156.Grinding experiments of fused silica are carried out on a test bench to evaluate the performance of the preparation and dressing method.The experimental results show that the surface roughness of the finished workpiece is 0.03 μm.The effect of the grinding parameter and dressing frequency on the surface roughness is investigated based on the measurement results of the surface roughness.This research provides an on-machine preparation and dressing method for ball-headed metal bonded diamond wheel used in the grinding of fused silica,which provides a solution to the tool setting method and the effect of electrode tool wear. 相似文献
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Yueming Liu Sheng Gong Jianyong Li Jianguo Cao 《The International Journal of Advanced Manufacturing Technology》2017,92(5-8):1751-1760
The camshaft is a crucial component of an engine’s valve train. This paper devotes to the experimental studies of the performance of laser surface textured (LST) camshaft. The first part experiment was carried out on the block-on-ring tester to investigate the tribological behaviors of textured surface in line contact. The area density of the textured dimples was in the range 3–40% with depths 5–24 μm and diameter 70 μm. The friction coefficient and wear tracks were analyzed to confirm the optimum textured patterns. After that, the local LST cams (textured on the lifting region) were further tested in a single-cylinder diesel. It was found that after 300 h durability test at the rated speed and load, the total lifting loss of cams decreased nearly 34.4% in maximum. In addition, the performance of the engine was not affected evidently. The enhanced lubricity and local hardening were two mechanisms for highly promoting the anti-wear property of the LST cams. 相似文献