共查询到20条相似文献,搜索用时 62 毫秒
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电子束焊接在齿轮加工中的应用 总被引:1,自引:0,他引:1
对电子束焊接的特点、工艺要求进行了简述,并通过实例说明这种焊接方法在齿轮加工中的应用场合,采用电子束焊接时各齿轮组件的加工工艺要求及工艺过程。实验结果表明,该工艺扩大了设备的加工能力,提高了设备的利用率。 相似文献
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最近几年 ,沙迪克公司将已开发的直线驱动系统用于电火花加工机床和加工中心而开辟了一片新天地 ,并且 ,正在扩大到直线冲压机与纳米机床新领域 ,在其主战场模具领域推出了全新技术。即使用“极粗”电子束对模具进行高速抛光。把电能应用于模具精加工工序的方案是一种划时代的加工方法。这种新技术不仅把模具表面精加工从手工作业中解放了出来 ,而且能使模具表面的质量得到提高。1电子束技术电子束是把电能通过聚焦用于穿孔等高速加工的一种加工技术。如果把这种思路反过来 ,将电子束不聚焦而作成极粗状 (图 1)。通过放粗后 ,利用降低的单位… 相似文献
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电子束加工与激光束、离子束加工均属高能束流加工新技术。电子束焊接(EBW)是利用射向工件喲电子束流所产生的热效应使工件局部加热产生熔化,从而达到焊接的目的。由于电子束焊接适用的工件材料十分广泛,焊接过程无污染,焊接变形较小,焊缝质量高,容易实现自动化控制等多方面的优点, 相似文献
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以美国SCIAKY公司的真空电子束焊机的真空机组系统的改进性设计为基础,介绍了真空系统设计的方法和步骤,并且釜对实际系统设计时遇到的问题提出了解决郑理论计算的不足。 相似文献
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电子商务中的关键技术 总被引:4,自引:0,他引:4
概述了近年来电子商务发展的状况,在讨论电子商务框架模型和发展趋势模型的基础上,对多项关键技术进行了深入探讨,其中包括电子商务的标准建设、应用服务器、搜索技术等。 相似文献
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Douglas L. Dorset 《Microscopy research and technique》1985,2(2):89-128
Electron crystallography of small organic molecules, i.e., electron diffraction crystal structure analysis, has been long recognized to possess definite advantages over neutron and x-ray diffraction techniques for the investigation of microcrystalline preparations. Quantitative application of the technique to real structural problems, on the other hand, had been hindered initially by an inadequate theoretical model. Yet, as demonstrated in this review of the methodology, the adequate recognition of limiting factors due to n-beam dynamical scattering and crystal deformation permits design of optimal diffraction experiments which yield intensity data suitable for ab initio structure analysis. Representative crystallographic analyses discussed here underscore the utility of this technique as a probe of organic molecular structure at atomic resolution. 相似文献
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谢颖奎 《仪表技术与传感器》2001,(8):38-39
介绍了一种利用光学原理对烟道排放进行监测的方法,并详细阐述了具体的光路,以及利用光的衰减检测粉尘浓度的原理和利用红外,紫外光吸收的方法检测SO2,NH3,NO,NO2的原理。 相似文献
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A. WALENTEK M. SEEFELDT B. VERLINDEN E. AERNOUDT & P. VAN HOUTTE 《Journal of microscopy》2006,224(3):256-263
Electron backscatter diffraction measurements were performed on a set of pearlitic steel samples after different heat treatments. The strengths and limitations of the technique with respect to the pearlite issue are presented. Interpretation of the obtained results confirmed that more than one pearlite colony may exist inside one ferrite nodule of nearly the same crystallographic orientation. It was also found that, in most cases, a misorientation of the order of several degrees exists between pearlite colonies within one ferrite nodule. Moreover, the ferrite matrix exhibits changes of crystallographic orientation inside colonies often accompanied by a network of low angle boundaries. The mean size of the ferrite nodule in the matrix was determined by means of electron backscatter diffraction. However, determination of the mean pearlite colony size was difficult and often impossible by means of both metallographic methods and electron backscatter diffraction measurements. 相似文献
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Three micrographs made at different tilting angles are necessary to determine the spatial coordinates of each point from the surface of micro-object. The x′ and y′ coordinates of the points are measured in an arbitrary coordinate system O'X′Y′ which ensures convenience in measurements. The coordinates measured are transformed into a main coordinate system OXYZ related to the microscope and the image plane. The z coordinates are calculated. The coordinates of the points are used to solve the following metric problems by applying analytical geometry: computation of (1) distances (between: two points, a point and a straight line, a point and a plane), (2) angles (between: two straight lines, a straight line and a plane, two planes), (3) area of a triangle and (4) volume of a body, which may devided into tetrahedra. A computer program for solving the above problems is written in BASIC. 相似文献
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