共查询到20条相似文献,搜索用时 78 毫秒
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稳压器设备为核电站核岛主设备之一,其电加热元件与其连接件的焊接又是该设备制造工艺的难点,对核电用电加热元件及其连接件的作用、所选用材料、焊接接头的型式进行了介绍,通过焊接评定试验对其焊接规范参数进行研究总结,并成功进行产品焊缝的焊接。 相似文献
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为得到寿命更长的钩爪,基于有限元仿真对“华龙一号”反应堆驱动机构钩爪的堆焊工艺进行优化。首先建立堆焊工艺仿真模型,通过仿真结果确定合理的焊接工艺和参数;然后根据优化后的焊接工艺进行零件试制,并对试验件进行金相检验、硬度检验和热态寿命试验。试验结果表明:采用钴基合金堆焊耐磨面的双齿钩爪具备较高的硬度和耐磨性,满足第三代压水堆核电厂对驱动机构运行寿命的要求。 相似文献
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《压力容器》2016,(1)
热棘轮分析是核电管道设计中重要的分析内容,压水堆(PWR)核电站一般基于Bree图对管道热棘轮效应进行了规定,但当管道受到很大的热冲击载荷时往往不能够满足此要求,需要进一步对管道棘轮安定性进一步分析。详细分析了RCC-M规范对于管道渐进性变形破坏的要求和工程上可行的评定准则,并采用基于材料试验数据的有效应力图法对稳压器排放管进行了热棘轮安定性分析,分析结果表明,在500次循环热冲击载荷作用下产生的热棘轮变形不会对管道的可运行性产生影响,累积变形对塑性稳定性边界的影响在有限范围内,管道依然满足RCC-M规范要求。基于试验的有效应力图法使用简单,非常适合工程设计应用,可用于PWR核电站管道热棘轮分析。 相似文献
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设计了磨粉机快辊轴承座的加工工艺和具体的工装夹具.利用卧式加工中心加工磨粉机快辊轴承座,辅以能够高效快速夹紧的夹具,既可以保证加工精度,又能够提高加工效率. 相似文献
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In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape. 相似文献
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本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当,影响了仪表的正常使用,制造厂和用户应关注这类问题。 相似文献
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通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即:增加导向机构。 相似文献
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Modern methods of implementation of the rule of positive gradient of mechanical properties are considered; this rule was formulated by I.V. Kragelskii and its application serves to minimize the friction and wear of solids. The given methods include the application of coatings with the method of finishing antifricton abrasion-free treatment; application of new metal-cladding lubricating materials; and creation of a nanostructural state of the surface iron nitride layer by nitriding steel with a positive gradient of hardness normal to the surface. 相似文献
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针对目前市场对工业设计人才的需求,本文论述了我校在工业设计教育方面的改革措施,着重介绍了我校工业设计教育在软件和硬件方面所进行的一系列的改革。 相似文献
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一种涡旋压缩机径向随变机构的设计 总被引:1,自引:0,他引:1
详细介绍了运用随变原理设计的一种新型径向密封机构的结构特点,工作原理及主要参数的确定方法,该机构可补偿由于涡旋体加工精度不高而造成的功率损失,适用于涡旋压缩机的批量生产。 相似文献