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Processing of high-precision ceramic balls with a spiral V-groove plate
Ming FENG,Yongbo WU,Julong YUAN,Zhao PING
《机械工程前沿(英文)》 2017年 第12卷 第1期 页码 132-142 doi: 10.1007/s11465-017-0436-z
As the demand for high-performance bearings gradually increases, ceramic balls with excellent properties, such as high accuracy, high reliability, and high chemical durability used, are extensively used for high-performance bearings. In this study, a spiral V-groove plate method is employed in processing high-precision ceramic balls. After the kinematic analysis of the ball-spin angle and enveloped lapping trajectories, an experimental rig is constructed and experiments are conducted to confirm the feasibility of this method. Kinematic analysis results indicate that the method not only allows for the control of the ball-spin angle but also uniformly distributes the enveloped lapping trajectories over the entire ball surface. Experimental results demonstrate that the novel spiral V-groove plate method performs better than the conventional concentric V-groove plate method in terms of roundness, surface roughness, diameter difference, and diameter decrease rate. Ceramic balls with a G3-level accuracy are achieved, and their typical roundness, minimum surface roughness, and diameter difference are 0.05, 0.0045, and 0.105 mm, respectively. These findings confirm that the proposed method can be applied to high-accuracy and high-consistency ceramic ball processing.
关键词: bearing ceramic ball spiral V-groove kinematic analysis trajectory
Zhenyun DUAN, Houjun CHEN, Zhilan JU, Jian LIU
《机械工程前沿(英文)》 2012年 第7卷 第3期 页码 312-321 doi: 10.1007/s11465-012-0308-5
In this paper, loxodromic-type normal circular-arc spiral bevel gear is proposed as a novel application of the circular-arc tooth profile at the gear transmission with intersecting axes. Based on the principle of molding-surface conjugation, the study develops a mathematical model for the tooth alignment curve and the computational flow at the design stage to enable the generation of the tooth surface. Machining of the tooth surface is then carried out to determine the interference-free tool path of the numerical control (NC). Moreover, a pair of loxodromic-type normal circular-arc spiral bevel gears is manufactured on computer numerical control (CNC) machine tools. The proposed theory and method are experimentally investigated, and the obtained results primarily reflect the superior performance of the proposed novel gear.
关键词: loxodrome circular-arc tooth profile Wildhaber-Novikov (W-N) gear spiral bevel gear
戴会超,彭澎
《中国工程科学》 2004年 第6卷 第2期 页码 33-37
长江三峡水利枢纽工程建设中重大技术问题的决策是建立在大量科学试验和专家论证的基础上,三峡工程水电站压力管道和蜗壳技术结构型式的选择不仅是重大的技术经济问题,也是关系水电站长期运行问题,文章介绍了三峡工程水电站压力管道和蜗壳技术型式选择及决策。
黄锐
《中国工程科学》 2008年 第10卷 第11期 页码 43-46
针对冷却塔中螺旋结构类型的气液交换塔,提出其内部螺旋塔板形状的设计方法,包括塔壁上外螺旋线和塔中心轴管上内螺旋线的位置确定,以及两线之间螺旋曲面板在平面上的拓扑尺寸。通过塔的几何参数确定螺旋曲面板设计的关键参数,可实现扭曲状塔板与塔壁及内轴的准确配合。
A wind tunnel study on control methods for cable dry-galloping
Hung D. VO,Hiroshi KATSUCHI,Hitoshi YAMADA,Mayuko NISHIO
《结构与土木工程前沿(英文)》 2016年 第10卷 第1期 页码 72-80 doi: 10.1007/s11709-015-0309-7
关键词: dry-galloping wind-relative angle single spiral wire double spiral wire circular rings
王裕清,梁剑
《中国工程科学》 2001年 第3卷 第12期 页码 68-70
曲面上点的主曲率计算是确定轮齿啮合压痕平面投影形状的关键。文章摈弃通常运用啮合原理和坐标变换计算的思路,从曲面本身的性质出发,把幺正活动标架和外微分引入主曲率计算,得到简明、有效的主曲率计算的新算法,并结合压痕公式给出了一个应用实例。该算法可以推广到任意曲面的主曲率计算。
李再光,龚威
《中国工程科学》 2001年 第3卷 第1期 页码 58-61
现有的工业CO2激光器,主要为横流、纵流和扩散冷却三种。文章提出一种新型激光器,即圆形金属腔CO2激光器。该激光器的腔体由多个等距、同轴安装的金属腔单元组成。每个腔单元有多个流道,放电在流道与腔体接口处产生,气流将放电及被其激活的粒子吹人腔内,形成增益,输出激光。文章研究了电极结构,金属腔壁对工作气体的冷却作用和腔内的增益分布。研究结果表明:多通道放电吹入和腔内旋流,有利于腔内的均匀放电;金属腔壁有利于腔内对流冷却,降低对气流速度的要求,从而缩小激光器的体积。相邻的腔单元相对转动适当角度,可以提高腔内增益分布的圆周均匀性,从而获得光束质量好的激光束。
TANG Renhu, YIN Fei, WANG Haijun, CHEN Tingkuan
《能源前沿(英文)》 2007年 第1卷 第3期 页码 300-304 doi: 10.1007/s11708-007-0043-5
关键词: m · diameter critical pressure sub-critical pressure maximum
梁桂明
《中国工程科学》 2001年 第3卷 第7期 页码 70-78
曲线齿锥齿轮和准双曲面齿轮(统称为“泛曲线齿锥齿轮”),是一种十分复杂而应用越来越广泛的传动装置。在设计上为了避免改变轴交角,而采用"零"变位传动(x1+x2=0)设计的齿形制,至今已在各国工业上通用近百年。文章介绍一种"非零"变位传动(x1+x2≠0)设计而又保持轴交角不变的创新齿形制。为了满足生产提出的要求,进行了二次开发。经过第二次创新,能在普通锥齿轮加工机床和刀具上切齿,故极易推广。近12年来,已成功地在工程机械、军品、立式机床、机车、船艇、油田、采煤、水泥等机械上采用,取得高综合强度、高可靠性、长寿命、小体积、低噪声、广泛适应性等优点,可取代(或覆盖)全部以美国Gleason为代表的零传动齿制设计的产品,还可实现某些Gleason所达不到的技术要求,故有广泛的应用前景。
王宏建,李靖,刘和光,姜景山
《中国工程科学》 2004年 第6卷 第11期 页码 38-42
文章通过电磁场时域有限差分(FDTD)算法与遗传算法(GA)相结合进行平面螺旋电感设计。通过优化单元网格大小,可优化设计整个平面螺旋电感(包含空气桥)的结构尺寸。介绍了该方法既能够进行严格的电磁场求解,又可以避免繁杂的实验过程,是优化设计的一种有效而准确的手段。
Nikolay V. Tsygan, Alexandr P. Trashkov, Igor V. Litvinenko, Viktoriya A. Yakovleva, Alexandr V.
《医学前沿(英文)》 2019年 第13卷 第4期 页码 420-426 doi: 10.1007/s11684-019-0688-6
关键词: stroke blood–brain barrier autoimmunity innate immunity inflammation cell death
Emulsification for castor biomass oil
Dongxiang ZHANG, Yuanping LIN, Anmei LI, V. V. TARASOV
《化学科学与工程前沿(英文)》 2011年 第5卷 第1期 页码 96-101 doi: 10.1007/s11705-010-0553-2
关键词: castor oil biomass oil emulsification stability viscosity corrosivity
《化学科学与工程前沿(英文)》 2023年 第17卷 第1期 页码 102-115 doi: 10.1007/s11705-022-2179-6
关键词: oxygen evolution reaction electrocatalysts ternary layered double hydroxides long-term stability
《医学前沿(英文)》 doi: 10.1007/s11684-023-1014-x
关键词: veno-venous extracorporeal membrane oxygenation in-hospital mortality high-volume centers quality control intensive care unit capacity parameters
A concise review about fracture assessments of brittle solids with V-notches
Hsien-Yang YEH, Bin YANG
《结构与土木工程前沿(英文)》 2019年 第13卷 第2期 页码 478-485 doi: 10.1007/s11709-019-0520-z
A concise review of recent studies about the fracture assessments of elastic brittle solid materials containing V-notches is presented. In this preliminary and brief survey, elastic stress distributions in V-notched solids are discussed first. The concept of notch stress intensity factor is introduced. Combine the digital image correlation method with numerical computation techniques to analyze the stress distribution near the notches. Fracture criteria such as strain energy density, J-integral, theory of critical distance are used.
标题 作者 时间 类型 操作
Processing of high-precision ceramic balls with a spiral V-groove plate
Ming FENG,Yongbo WU,Julong YUAN,Zhao PING
期刊论文
Mathematical model and manufacture programming of loxodromic-type normal circular-arc spiral bevel gear
Zhenyun DUAN, Houjun CHEN, Zhilan JU, Jian LIU
期刊论文
A wind tunnel study on control methods for cable dry-galloping
Hung D. VO,Hiroshi KATSUCHI,Hitoshi YAMADA,Mayuko NISHIO
期刊论文
An investigation into the heat transfer characteristics of spiral wall with internal rib in a supercritical
TANG Renhu, YIN Fei, WANG Haijun, CHEN Tingkuan
期刊论文
Autoimmunity in acute ischemic stroke and the role of blood—brain barrier: the dark side or the light one?
Nikolay V. Tsygan, Alexandr P. Trashkov, Igor V. Litvinenko, Viktoriya A. Yakovleva, Alexandr V.
期刊论文
Synergistic effect of V and Fe in Ni/Fe/V ternary layered double hydroxides for efficient and durable
期刊论文
Association between ICU quality and in-hospital mortality of V-V ECMO-supported patients—the ECMO quality
期刊论文