共查询到20条相似文献,搜索用时 31 毫秒
1.
针对机器人用四点接触球轴承旋转精度难以预测和控制的问题,提出了同时考虑轴承内圈沟道和外圈沟道圆度误差的轴承旋转精度数值计算方法。根据轴承内部元件运动学和几何学关系建立轴承旋转精度数值计算模型。使用MATLAB编写轴承旋转精度求解程序,得到内圈沟道圆度误差幅值和谐波阶次、外圈沟道圆度误差幅值和谐波阶次、钢球直径偏差及钢球个数对轴承旋转精度的影响规律。进行了轴承旋转精度试验,验证了仿真结果的正确性。轴承旋转精度涉及很多指标,所研究的四点接触球轴承旋转精度衡量指标指轴承外圈径向跳动。结果表明:轴承外圈径向跳动随着内外沟道圆度误差幅值的增大先平稳后快速增大,随着内圈外沟道圆度误差谐波阶次的增大呈现周期性变化,随着钢球直径偏差的增大呈线性减小,随着轴承内部钢球个数的增大呈指数减小。所建模型解决了四点接触球轴承旋转精度难以进行理论求解的问题,能够准确预测轴承的旋转精度,为四点接触球轴承的精度设计提供了理论基础。 相似文献
2.
3.
4.
介绍了常规三排圆柱滚子组合转盘轴承保持架的选材及结构特点,在此基础上,提出盾构机用转盘轴承保持架采用整体式结构,主体材料采用合金钢锻件,保持架引导面及与滚道的接触部位采用铝青铜或铅黄铜作为减摩块的设计方案。 相似文献
5.
针对加工制造有振动要求的滚动轴承,其直接影响振动指标的主要轴承零件(内圈、外圈)难以在生产过程中及时检测控制的问题,通过大量试验与理论推导分析,总结出一种可对轴承内、外圈在生产过程中进行及时、可靠的振动检测控制方法,该方法为使用圆度仪通过测量圆度值中15~500波的数值来考核轴承内、外圈沟道质量,从而达到控制轴承成品振动性能。 相似文献
6.
A low cost, high accuracy roundness measuring system 总被引:2,自引:0,他引:2
This work presents a new architecture of a roundness measuring system in which the roundness measuring accuracy is not dependent on motion accuracy of the rotary element. In this architecture, the influence of motion errors on roundness measurement is minimized by applying a new error separation technique developed by Horikawa et. al. [1 and 2], the improved Reversal Method — IRM. A prototype that uses: a rotary table supported by ball bearings, non-contact gap sensors and a computer system that collects and process sensor readings has been developed. Experimental results have shown that even using a rotary table supported by ball bearings, that has non-repetitive motion errors larger than 2μm, the final measurement repeatability is better than 0.3μm of peak-to-peak value. In order to ensure the same levels of accuracy of the proposed system, a traditional roundness measuring system design must use a more precise and therefore more expensive type of bearing with a motion error no larger than 0.1μm. 相似文献
7.
8.
9.
10.
A special apparatus designed for the evaluation of high temperature lubricants in 20 mm bore ball bearings is described. The results of bearing runs at temperatures up to 1500 F in air are reported. Of the greases evaluated, a fluorocarbon grease, provided bearing lubrication for longer times at 450 and 600 F than either polyphenyl ether or silicone greases thickened with dyes and/or MoS2. Cobalt alloy ball bearings, lubricated either with barium fluoride-calcium fluoride coatings bonded to the cages or with porous metal cages impregnated with these fluorides, ran successfully at 1200 and 1500 F under a thrust load of 30 pounds and at a shaft speed of 5000 rpm. 相似文献
11.
12.
13.
针对滚动轴承运行特点,采用XRF技术调查和分析铜、铁及尼龙为主体材料的保持器在脂润滑条件下的磨损,研究保持器磨损与轴承滚动体磨损之间的相关性及对轴承磨损失效过程的影响,并对不同材料保持器所产生的磨损颗粒对轴承及润滑脂的影响进行初步分析和探讨。统计数据分析结果表明,不同结构或材料构成的保持器在脂润滑轴承运转过程中始终存在着一定程度的磨损,且与轴承滚动体的磨损在磨损相对数量上显著相关;高聚物尼龙保持器所形成的磨损颗粒的影响,更多地反映为保持器材料中硬质填料的机械作用,而钢制保持器因其磨损颗粒具有金属活性和催化性,磨损颗粒同时还加速润滑脂的化学氧化过程及对脂稠化剂网状结构的破坏。 相似文献
14.
在分析外圆工件贯穿无心磨削原理的基础上 ,提出一种既可保证磨削圆度又可提高磨削效率的直线轴承弧形外圆磨削新方法 ,并设计了辅助夹紧装置。 相似文献
15.
在分析外圆工件贯穿无心磨削原理的基础上,提出一种既可保证磨削圆度又可提高磨削效率的直线轴承弧形外圆磨削新方法,并设计了辅助夹紧装置. 相似文献
16.
Tomohiko Ise Naoyuki Arita Toshihiko Asami Takenori Nakajima Iwao Kawashima Tadashi Maeda 《Precision Engineering》2014
We have developed externally pressurized small-size conical shaped gas bearings for micro rotary machines such as gas blowers, compressors, and medical devices. The bearings are lightweight and enable machines and devices to be downsized by reducing the number of parts, since the journal and thrust loads can be supported by a pair of bearings. The conical bearings (diameters 8 mm and 10 mm) were designed and the manufacturing techniques were considered. The bearing type is a double-row inherent orifice bearing with four feed holes per row. The shape accuracy of the manufactured bearings is within the design limits, being less than 0.005 mm in both roundness and cylindricity. The surface roughness (arithmetic average roughness) of the parts is 0.0002 mm. The static characteristics were calculated and validated by testing on manufactured bearings. Comparative agreement was obtained between the measured and designed values. The proposed calculation method presents as a relatively simple approach for predicting the bearing characteristics. The test rotor exceeded 350 Hz (21,000 rpm) in the rotational test, and whirl vibration was absent. During testing, the maximum rotor vibration amplitude was 0.0125 mm (corresponding to an eccentricity ratio of 0.89). 相似文献
17.
18.
Tsuyoshi Saito Michiharu Naka Hiroyuki Ito Toyohisa Yamamoto Shigeki Matsunaga 《摩擦学汇刊》2013,56(1):162-167
Rolling bearings used for transporting wafers and liquid crystals in the film-forming process of semiconductor and LC panel manufacturing are required to minimize the particles (originating from both lubricant and bearing material) they generate while in operation. The research reported in this paper focuses on the particle generation under different rotational conditions of ball bearings and ball screws coated with various solid lubricants and operating in a vacuum environment. The results of the tests indicated that a specially composed and applied polytetrafluoroethylene (PTFE) coating was superior in minimizing particle generation by ball bearings and ball screws. Observation of the bearing interior surfaces indicated that particle generation is primarily caused by wear of cage-pocket surfaces, while sudden and large increases in wear are the result of the balls making direct surface-to-surface contact with the raceways and cages due to erosion of the solid lubricant coatings. 相似文献
19.
This paper identifies the failure mechanisms of ball bearings in low-power motors for electronics cooling. This study contrasts with previous studies on bearing life in its precipitation of failures under lightly loaded, non-accelerated usage conditions that are more representative of electronics cooling applications. Life tests were conducted on bearings composed of steel balls, steel inner and outer races, and a glass-fiber reinforced polyamide cage. Failure analysis of the ball bearings indicated that lubricant loss, transfer film formation, and wear particle generation were the failure mechanisms. Severe wear was found in the glass-fiber reinforced polyamide cages after failure. Several features extracted from the acoustic emission signals were identified as indicators of bearing degradation. 相似文献