共查询到20条相似文献,搜索用时 937 毫秒
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研究了电刷镀技术在镁合金制飞机零部件表面划伤修复中的应用,提出了电刷镀修复镁合金的工艺流程及条件。 相似文献
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研究了电刷镀技术在飞机铝合金零件表面划伤修复中的应用,提出了电刷镀修复铝合金件表面划伤的工艺流程及条件。 相似文献
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研究了歼击机航泡磨损零部件电刷修复的工艺流程、镀液配方及工艺条件,提出了用电刷镀修复航炮磨损零部件的方法。 相似文献
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简单介绍电刷镀技术及其特点和在修复零件方面的应用。结合刷镀技术修复钻床动力头轴承室的典型实例,重点介绍刷镀工艺的原理、方法和效果。提出了发展电刷镀技术修复机械零件的可行性及其深远意义。 相似文献
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《材料保护》2016,(9)
连杆轴承损坏后采用手工电刷镀修复存在大头轴承座孔及镀层厚度沿周向不均、人工因素影响大、劳动强度大、操作环境差等缺点。为此,采用一种流镀融合电刷镀的电沉积技术修复斯太尔发动机连杆大头轴承座孔。利用SEM、XRD、显微硬度计等考察了镀层的组织结构和性能,并与传统手工电刷镀修复连杆工艺进行了对比。结果表明:该技术制备的镀层均匀、致密、孔隙率低,晶粒尺寸小,镀层硬度高,平均约为590.4 HV,比手工刷镀件的相应值479.4 HV高111.0 HV;采用该技术可以在35 min内一次镀覆6件连杆,手工电刷镀修复单件连杆需耗时约1 h,效率大幅提高;该技术过程工艺参数可以有效控制,可实现自动化并用于零件再制造。 相似文献
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A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling. 相似文献
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An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a
rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate
agreement is demonstrated between the derived relations and experimental data. 相似文献
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Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue. 相似文献
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水三相点是开尔文热力学温度的唯一基准点,也是ITS-90国际温标重要的定义固定点。因此,水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来,中国计量科学研究院研制出一系列高质量的水三相点容器,加强了水三相点的研究,为不确定度的分析提供了更为可靠的实验依据。同时,不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此,根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明,其扩展不确定度为0.16mK(k=2.69,P=0.99)。 相似文献
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