共查询到19条相似文献,搜索用时 125 毫秒
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《工具技术》2018,(11)
本文在超声脉冲电化学光整加工的基础上,提出磁场辅助协同超声脉冲电化学复合光整加工技术。首先,探讨磁场辅助协同超声脉冲电化学光整加工机理,研究表明,磁场促进超声脉冲电化学加工,降低了脉冲电化学反应过程中的浓差极化,提高了脉冲电化学反应的速率,促使带电离子的运动复杂化,同时磁场能够聚焦带电离子,促进带电离子向前运动,提高电化学反应的效率和均匀性。然后,进行超声研磨加工、超声脉冲电化学加工和磁场辅助协同超声脉冲电化学加工钢实验,实验结果表明,磁场辅助协同超声脉冲电化学复合加工的速度大于超声脉冲电化学加工和超声研磨加工速度,磁场促进了工具—工件电极间的电化学反应速度,提高了光整加工效率;磁场促进了电化学反应的均匀性,提高了光整加工质量。 相似文献
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着重介绍了脉冲电化学机械光整加工工艺的特点,光整加工原理;通过实验验证了这种光整加工工艺与电化学机械光整加工工艺相比,有着高效、高表面质量的优点;分析了脉冲电化学机械光整加工工艺的机理;对这种光整加工工艺目前存在的问题及发展前景进行了探讨。 相似文献
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脉冲电化学机械光整加工工艺的基础研究 总被引:3,自引:0,他引:3
着重介绍了脉冲电化学机械光整加工工艺的特点,光整加工原理;通过实验验证了这种光整加工工艺与电化学机械光整加工工艺相比,有着高效、高表面质量的优点;分析了脉冲电化学机械光整加工工艺的机理;对这种光整加工工艺目前存在的问题及发展前景进行了探讨。 相似文献
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脉冲电化学光整加工的机理及影响因素 总被引:6,自引:0,他引:6
论述脉冲电化学光整加工特点,研究脉冲电化学光整加工机理,根据光整加工原理进行实验设计。根据实验得到的优选数据进行加工,有效地降低了表现粗糙度3-5级,达到了光整加工目的。结合实验从理论上分析了影响脉冲电化学光整加工的加工间隙、脉冲电流、流场、电解液的压力和流速以及其它工艺参数等因素。 相似文献
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脉冲电化学及脉冲电化学机械光整加工工艺 总被引:2,自引:0,他引:2
介绍了脉冲电化学光整加工及脉冲电化学机械光整加工原理和工艺特点,分析了电化学加工表面和机械加工表面的微观几何形貌对零件的机械性能和使用寿命的影响,表明电化学加工表面的优越性,并对其精度特性进行了分析. 相似文献
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Mathematical modeling for finishing tooth surfaces of spiral bevel gears using pulse electrochemical dissolution 总被引:1,自引:1,他引:0
Ning Ma Wenji Xu Xuyue Wang Zefei Wei 《The International Journal of Advanced Manufacturing Technology》2011,54(9-12):979-986
Gears with a complex curve tooth, such as spiral bevel and hypoid gears, lack an ideal technique for the final finishing process. Pulse electrochemical finishing (PECF) is considered a promising method for surface finishing due to its micro-removal characteristics. A PECF system for spiral bevel gear (SBG) is established according to the generation of SBG tooth surfaces. An SBG (module, 12?mm; number of teeth, 38) is selected as the processing test piece, and mathematical models are developed for analyzing the characteristics of PECF. The influence of the experimental variables, including applied voltage, interelectrode gap, and finishing time, on the total removal thickness and surface roughness is discussed. The calculated values are found to be approximately consistent with the experimental values. The other parameters, including the concentration of electrolyte, tool rotational speed, flow rate of electrolyte, and pulse period, are also studied. Results show that the roughness of the SBG tooth surface is reduced from Rz 7.13 to 4.32???m. The precision of the SBG is also improved. 相似文献
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理论推导了U型、V型和梯形3种柔性蒙皮支撑结构面内横向无量纲化弹性模量与其平面几何参数(壁厚系数t、高度系数h、形状系数k)之间的关系:其等效弹性模量随t增大而增大,随h增大而减小,随k增大而减小。采用ANSYS软件进行了有限元模拟并通过实验对其面内力学特性进行验证。同样参数条件下,3种结构面内横向刚度从大到小依次为V型、U型和梯形。说明梯形结构具有更强的变形能力,产生同样的变形需要的能量最小。对3种结构的面法向刚度进行了有限元仿真和实验比较,其面法向刚度随几何参数的变化规律与面内等效弹性模量相似;在相同等效面法向气动载荷作用下,3种结构面法向位移大小依次为梯形、U型和V型。对3种结构拉伸前后不同载荷作用下的面法向最大位移进行实验测量,发现面法向刚度在拉伸后都有较大提升,在产生相同的面法向位移情况下,承受的压强平均提高了30%~60%。 相似文献
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为快速、准确地检测工业生产中工件表面产生的缺陷,提出了一种基于Yolo V3的工件表面缺陷检测方法。该方法以DarkNet卷积模型作为特征提取网络,通过引入数据增强方法防止产生过拟合现象,并针对工件表面缺陷形状单一、缺陷尺寸普遍偏小的特点改进了Yolo V3网络的特征融合方式,减少了冗余候选框的数量,提升了算法性能。以环形工件作为检测对象搭建了实验平台。实验结果表明,所提方法能克服人工提取特征的局限性,检测精度和检测速度均满足实际生产要求。 相似文献
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Raimondi MT Sassi R Pietrabissa R 《Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine》2000,214(6):577-587
Studies on retrieved hip prostheses are currently performed in order to assess the wear mechanisms and the overall wear rate of such artificial joints. Several reported studies on the survival of artificial hips have been based on the measurement of the amount of worn material directly on retrieved acetabular cups. The estimation of the change in volume, V, of the cup cavity is particularly difficult in the case of slight wear due to several factors of which the most critical is the lack of information on the unworn geometry of the cup. This paper presents a new measuring technique, which is described in detail and has been applied to estimate the wear of 65 acetabular cups harvested from revised hip arthroplasty. The coordinate data of several points on the articular surface are sampled using a coordinate measuring machine (CMM). The value of V is calculated mathematically from the measurements by using the hypothesis that the actual shape of both slightly worn and highly worn surfaces has a small departure from a truly spherical shape. The wear volume is estimated with reasonable accuracy mainly on those cups showing penetration depths greater than 0.2 mm, corresponding to an amount of wear greater than 100 mm3 for a 32 mm cup. The uncertainty in the results is estimated for each cup. The repeatability of the technique is studied for a case showing very slight wear. The advantages, disadvantages and limitations of the method are presented and discussed. 相似文献
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采用有限元软件ANSYS对碟形金属波纹管的轴向刚度进行了非线性分析,并进行了轴向刚度试验,将试验结果、有限元分析结果与曲梁简化模型推导出的刚度计算公式,以及原有焊接波纹管的刚度计算公式进行了对比,结合U形波纹管轴向刚度的计算结果,验证了有限元和曲梁简化公式的正确性,具有一定的工程应用价值。 相似文献
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一种骨架线驱动的产品曲面变形设计方法 总被引:1,自引:0,他引:1
针对复杂产品外形设计中一类由骨架线驱动的曲面变形设计问题,提出基于变分原理和扩散效应控制目标曲面变形的设计方法。通过提取决定产品外形曲面几何特征的骨架线(如脊线、谷线),按照给定的约束条件控制曲面骨架线的几何变形,以变形后的骨架线为几何约束条件控制曲面形状的变化趋势,从而实现产品形状变形设计。此外,利用该方法可以提取原曲面拉普拉斯微分坐标表示的曲面细节,保持曲面变形过程中几何细节特征基本不变。产品曲面变形实例验证了方法的有效性。 相似文献