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1.
Significant improvement in load capacity, wear resistance, friction coefficient etc. of tribological mechanical components can be obtained by forming regular micro-surface structure in the form of micro-dimples on their surfaces. A feasibility study was performed both theoretically and experimentally using the Laser Surface Texturing (LST) technique to produce the micro-dimples. Each micro-dimple can serve either as a micro-hydrodynamic bearing in cases of full or mixed lubrication or as a micro-reservoir for lubricant in cases of starved lubrication conditions. Theoretical models were developed, and laboratory tests were performed, to investigate the potential of LST in tribological components like mechanical seals, piston rings and thrust bearings. In the entire laboratory tests, friction was substantially reduced with LST compared to the non-textured components.  相似文献
2.
Laser surface texturing (LST) is an emerging effective method for improving the tribological performance of friction units lubricated with oil. In LST technology, a pulsating laser beam is used to create thousands of arranged microdimples on a surface by a material ablation process. These dimples generate hydrodynamic pressure between oil-lubricated parallel sliding surfaces. The impact of LST on lubricating-regime transitions was investigated in this study. Tribological experiments were conducted with a pin-on-disk apparatus at sliding speeds in the range of 0.015–0.75 m/s and nominal contact pressures that ranged from 0.16 to 1.6 MPa. Two oils with different viscosities (54.8 and 124.7 cSt at 40 °C) were used as lubricants. The test results showed that laser texturing expanded the contact parameters in terms of load and speed for hydrodynamic lubrication, as indicated by friction transitions on the Stribeck curve. The beneficial effects of laser surface texturing are more pronounced at higher speeds and loads and with higher viscosity oil.  相似文献
3.
The present study investigates the potential of surface textures to improve the friction situation of the piston/roller contact in hydraulic motors at low speed and high pressure. A self-adjusting flat on flat rig, with conditions representative of an actual hydraulic motor, is used in a reciprocating sliding motion. The samples are made out of the same materials and the surface finishing operations are the same as used in the motor.The piston surfaces are textured using newly developed embossing tools comprising micromechanically formed all-diamond surfaces. The textured surfaces involve parallel grooves and crossed grooves, each of four different spacings. Also polished surfaces were tested. Un-textured—as tumbled—surfaces are used as reference.Generally, it was found that the friction level was only marginally influenced by the textures. However, the friction fluctuations were reduced. SEM investigations disclosed rather severe modifications of the surfaces during use, primarily caused by plastic deformation of the surface layer. The results and their practical implications are discussed.  相似文献
4.
边界润滑条件下表面微细织构减摩特性的研究   总被引:8,自引:0,他引:8  
表面织构(Surface texture)已被证明是一种提高表面承载力和改善表面摩擦学特性的有效方法。然而在边界润滑条件下,织构对表面摩擦性能的影响机制仍未明确。利用纳米压痕仪在碳钢表面制作了具有不同密度和深度(125~500nm)的划痕的点阵,并通过改进的四球试验机对其在边界润滑下的摩擦性能进行了评价。试验载荷为100~300N,相对滑动速度为0.19~1.33m/s。研究发现:在边界润滑条件下,深度为125nm的低密度"划痕"点阵具有良好的减摩效果。  相似文献
5.
表面织构及其对摩擦学性能的影响   总被引:6,自引:1,他引:5  
介绍了表面织构的图案和加工方法以及摩擦学性能的测试方法,阐述了不同表面织构对摩擦学性能的影响及机制,总结了当前表面织构研究的主要成果,并提出了未来表面织构研究需要深入开展的工作.  相似文献
6.
A novel technique has been developed to manufacture well-defined micro-scale embossing tools, intended for tribological texturing of metallic surfaces. The tools are formed by growing a CVD diamond film onto a silicon mould. This film is then supported by a thicker layer of electro deposited nickel, and cut into the final size. The finished tool is then pressed against the metallic surfaces, thus forming the large array of small indents that constitute the final texture. The tool manufacturing technique is briefly described and examples of texturing flat and curved steel surfaces in a lab scale are given. The possibilities to develop this technique into commercial production techniques are discussed.  相似文献
7.
基于马尔可夫随机场工件表面纹理模型的刀具状态监测   总被引:5,自引:0,他引:5  
基于马尔可夫随机场理论,建立了工件表面纹理图像的马尔可夫随机场纹理模型,并对工件表面纹理图像的特点进行了分析。在实验数据的基础上,对工件表面纹理图像的特征参数进行提取,提出采用相对距离作为刀具磨损程度的评价指标。指出三阶马尔可夫随机场能比较充分地反映工件表面纹理图像的特征。实验结果表明,基于马尔可夫随机场的工件表面纹理分析方法能够较好地适用于刀具状态监测。  相似文献
8.
Surface texturing by pulsed Nd:YAG laser   总被引:5,自引:0,他引:5  
Introducing specific textures on a tribological surface can contribute to friction reduction in sliding contacts. In the present paper, a pulsed Nd:YAG laser emitting at 1064 nm, was used against 100Cr6 steel samples in order to produce well-defined surface micro-pores, which can act as lubricant reservoirs, micro-hydrodynamic bearings as well as traps for wear debris. Due to the high flexibility of the laser system, structural features such as shape, size, density and depth can be varied easily by changing the laser parameters. To optimize the parameters of the laser surface texturing process, an investigation was performed using different pulse numbers, various pulse energies and two different modes (single- and multi-mode). The microtextures were characterized with optical microscopy, scanning electron microscopy (SEM) and by topography techniques. The relationship between the laser processing parameters and qualitative and quantitative profile of the micro-pores was studied. Tribological testing of laser textured surfaces was performed in a low frequency–long displacement reciprocating sliding wear tester under boundary lubrication and results compared to un-textured case. Tribological comparison of textured, textured and lapped, and untextured surfaces shows only minimal influence of texturing for contact conditions investigated.  相似文献
9.
一种新的表面形貌检测方法   总被引:4,自引:1,他引:3  
共焦激光扫描显微镜是近年来发展起来的一种新型显微镜。本文介绍了日本奥林巴斯公司研制OLS1100型共焦激光扫描显微镜性能特点,并着重介绍了利用其独有的纵向分辨能力和高的平面分辨率,在对微动磨损、显微划痕以及进行表面形貌观察和参数检测的应用。  相似文献
10.
Water lubricated silicon carbide is expected to be widely used for sliding bearings and mechanical seals in hydraulic systems since it is environmentally friendly and saves energy. The purpose of this study is to find the optimum surface texture to improve the load carrying capacity of SiC bearings working in water. Micro-pits, evenly distributed in a square array, were selected as the texture pattern, and formed on one of the contact surfaces by reactive ion etching. Experiments, which simulate the working condition of thrust bearings, were carried out to evaluate the effects of the micro-pits on the critical load of the transition of the lubrication mode from hydrodynamic to mixed. The results are summarized in the form of a load carrying capacity map. It was found that an optimum geometric and distributive range of micro-pits exists, where the load carrying capacity can be increased at least twice over that of an untextured surface.  相似文献
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