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卡尺是长度测量量具,通常被运用于外尺寸和内尺寸、盲孔、阶梯形孔(凹槽)等相关尺寸的测量,它对机械加工过程测量和产成品检验等起着关键的作用。本文作者对生产一线操作人员对卡尺使用情况进行了调研,结合计量检定人员丰富的工作经验,总结出卡尺一些常见故障产生的原因及解决方法。 相似文献
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在测试工作中,测量圆沟槽底径尺寸一直是比较困难的。目前,有的单位用弹簧式卡钳或用卡尺弹簧量爪进行测量。但这些办法测量精度均较低。为了提高测量精度,我们采用改进测头后的内径表测量圆沟槽底径尺寸。如图1所示, 相似文献
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一、用挤压法使卡尺测量面产生修磨余量卡尺在使用中的磨损,使测量面失去了应有的平面性与平行性。在修理工作中必须保证测量面有“修磨余量”。使卡尺产生修磨余量,特别是对“死游标”及具有刀口形的内量爪测量面产生修磨余量,是卡尺修理中的关键问题。用挤压法使测量面产生修磨余量,不仅速度快,省工时,而且可以在一个位置上多次使测量面产生修磨余量。特别是在游框内采用单向挤压,完全看不到压痕,不影响卡尺外观。 相似文献
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本文探讨了JJG 30-2012《通用卡尺》检定规程中给出的示值误差测量方法的局限之处,阐述了用激光干涉仪测量通用卡尺示值误差的装置结构与读数方法,对改进后的测量方法进行了不确定度评定,验证了方法的可行性. 相似文献
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为了确保内测卡尺的校准数据的准确可靠,有必要将其纳入常规几何量的量值传递和溯源系统,根据内测卡尺的工作原理和计量特性,提出其计量性能和测量结果不确定度的评定,作为开展内测卡尺校准的主要技术依据。 相似文献
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建立高度卡尺示值误差测量不确定度的测量模型,对高度卡尺测量过程中引入的不确定度进行分类和量化,较为全面地评定了各个不确定度分量,并得出测量结果的扩展不确定度。 相似文献
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差值法与比值法对不同测量系统的误差修正效果不一样.本文将两种方法的比较用一个比值来描述,并用推得的公式进行量化表示.在进一步的应用研究中,理论分析与实验数据相互印证,同时得到许多有益的结论,有助于全面掌握测量系统的误差来源,从而灵活选择各种修正方法以获得更加准确的测量结果. 相似文献
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T. I. Zohdi 《International Journal of Fracture》2012,177(1):89-95
For composite materials, two quantities that are useful for characterizing the contribution of inhomogeneities in a matrix material to the overall properties are (1) the individual H-tensor, H i , which describes the contribution of a single inhomogeneity and (2) the overall strain concentration tensor, which describes the relationship between the overall volumetric strain to the average strain of all of the inhomogeneities. In this paper, we develop a relationship expressing the overall H-tensor, ${\mathcal{H}}$ , in terms of the overall strain concentration tensor. An important feature of the derivation is that it allows for rigorous upper and lower bounds on the overall H-tensor. In the special case that the inhomogeneities are all the same, with the same orientation, then ${\mathcal{H} = {\bf H}_i}$ , and the results derived for ${\mathcal{H}}$ also hold for H i . 相似文献
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Tatsuo Inoue 《Acta Mechanica》2010,214(1-2):17-30
Tatara, a traditional steel-making system developed in Japan, and the Japanese sword are briefly introduced from a technological point of view, followed by some comments on scientific aspects. Attention is paid to the comparison with methods developed in foreign countries. The quenching process being operated in the final stage of sword making is focused on, and results of a computer simulation by a code COSMAP based on metallo-thermo-mechanics are presented to know how the temperature, metallic structure and stress/distortion vary in the process. 相似文献
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本文提出了一种采用测量接收机HP8902A测量射频信号源谐波的方法,对该方法的特点及应用范围进行了分析与说明,并通过与常规的频谱分析仪测量谐波的方法进行比较,确定了该测量方法的可行性,可以用于没有频谱分析仪的情况下射频信源谐波的检定。 相似文献
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Subrata Mukherjee Mahesh Morjaria 《International journal for numerical methods in engineering》1984,20(3):515-522
The efficiency and computational accuracy of the boundary element and finite element methods are compared in this paper. This comparison is carried out by employing different degrees of mesh refinement to solve a specific illustrative problem by the two methods. 相似文献
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