共查询到20条相似文献,搜索用时 78 毫秒
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分析内喷式阴极展成电解加工的流场特点,讨论阴极腔内电解液的压力分布和出口处速度的大小。在此基础上,对展成电解加工间隙特性进行了试验研究,所得结果为该项技术的实际应用提供了依据。 相似文献
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电解加工作为整体构件制造的主要技术之一,其流场设计的合理性将严重影响电解加工过程的稳定性、加工效率和质量。针对航天发动机叶片式扩压器设计了部分阻隔式反W型流场,并开展了与侧流式和反W型流场的仿真比较。仿真结果表明,该流场方式可以保证加工区电解液的高速流动,并能有效避免进/排气边漏液现象。最后,在部分阻隔式反W型流场中开展了叶片式扩压器电解加工试验,在阴极进给速度为0.5 mm/min时加工出了扩压器叶片,验证了流场设计的合理性。 相似文献
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针对航空发动机叶片电解加工阴极设计这一具体工程应用,在模型叶片三维实体建模的基础上,着重研究两种阴极设计方法,即基于叶片电解加工实际电场分布的阴极设计有限元数值解法以及同时考虑极间电场和电解液流场特性的阴极设计有限元数值解法。详细地对比了两种阴极设计方法对极间电势分布、间隙分布和阴极边界条件的影响,通过一系列的工艺试验验证了同时考虑电解加工电场和流场特性的阴极设计方法较单纯考虑电场特性的阴极设计方法更全面、更符合电解加工的实际物理过程,因而所设计的阴极更加精确合理。 相似文献
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介绍了CAXA制造工程师软件编程的操作流程,结合型腔铣削实例,阐述了CAXA制造工程师从实体造型、刀具轨迹的生成及仿真加工等一系列的过程。 相似文献
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钛合金型腔圆角加工容易发生切削负载增大和颤振等现象,导致圆角表面质量较差,难以实现钛合金高效加工。通过钛合金型腔圆角铣削试验,基于铣削力和圆角表面质量检测,分析内圆角铣削特征和原理,并优化铣削参数。试验表明:采用小切削宽度的高速加工,可实现钛合金内圆角的高效加工;在Vc=90m/min,ft=0.06mm/t,ap=20mm,ae=1mm切削参数组合下,切削力相对较小,加工效率高,切削表面质量高。 相似文献
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W. M. Stobbs 《Journal of microscopy》1979,116(1):3-13
The full range of methods by means of which cavities can be examined using a transmission electron microscope are reviewed. Different techniques are required in different circumstances and the extent to which a quantitative interpretation can be given is discussed for a number of examples. These range from the use of structure factor contrast for relatively large pores through the use of Fresnel contrast for intermediate sized pores with a dimension in the 0·4–20 nm range to elastic side band imaging and atomic resolution techniques for pores with sizes less than about 0·6 nm. 相似文献
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介绍了Pro/E一模多腔设计的基本原理与方法,并通过实例说明这些方法的具体应用,指出了它们各自适用的场合. 相似文献
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N. P. Sobenin A. A. Sulimov A. I. Fadin A. N. Vornovskii A. A. Zavadtsev 《Instruments and Experimental Techniques》2000,43(6):774-776
A setup for measuring the permittivity and the loss parameter of ceramic samples is described. The setup operation is based on a conventional method for measuring changes in the frequency and Q-factor values of cavities caused by insertion of experimental samples into the cavity. Cylindrical ceramic samples with the permittivity = 8–10 and loss parameter tan = (2–4) × 10–4 were studied. A cylindrical E
010 cavity with a cutoff waveguide attached to one of the faces of the cavity was selected, because it provided sufficient accuracy of measurement and could be effectively used for testing series of samples of various sizes and shapes at a fixed frequency of 1300 MHz. It was shown that the permittivity of various samples could be determined with an accuracy of 1.5%, whereas the loss parameter could be determined with an accuracy of 7%. 相似文献
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Observed and predicted cavity shapes in a lubricant between two disks are presented. The geometry is similar to that of a thrust bearing or a face seal having non-parallel rotating surfaces. Photographs of cavitated regions are shown and compared with predictions of cavity shapes obtained by an approximate calculation method analogous to the short bearing analysis used for journal bearings. The calculation and the experiment show steady state cavities that are symmetric about the maximum gap thickness. For small angles of disk inclination a single exterior cavity is seen and for larger values of inclination both an interior and an exterior cavity are present. The predicted cavity shape in a given case is a function of the disk inclination, the lower bound pressure for the oil film and rotor speed. General agreement on the cavity shape is obtained between theory and experiment. 相似文献