共查询到19条相似文献,搜索用时 62 毫秒
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一、电子束焊接原理与特点电子束焊接是利用汇聚的高速电子流轰击工件接缝处所产生的热能 ,使金属融合的一种焊接方法。电子束是从电子枪中产生的。通常电子是以热发射的方式从发射体 (阴极 )逸出。在 2 5~ 30 0kV电压的作用下 ,电子被加速到 0 .3~ 0 .7倍的光速 ,具有极大的动能。经电子枪中静电透镜和电磁透镜的作用 ,电子汇聚成能量密度很高的电子束。这种电子束撞击到工件表面 ,电子巨大的动能就转变为热能 ,使金属迅速融化和蒸发。在高压金属蒸汽的作用下融化的金属被排开。电子束就能继续撞击深处的固态金属 ,很快在被焊工件上钻… 相似文献
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提出了叉车变速箱内前进、倒档齿轮,高速、低速齿轮应用电子束焊接技术的加工方案,在保证焊接强度、控制变形等方面进行了工艺分析,选用了合理的焊接参数,并证实了此加工方案行之有效。 相似文献
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电子柬焊接是一种新型焊接技术,它与其它工艺相比具有焊缝质量高、变形小及效率高等特点,在机械加工中有广阔的应用前景。本文以特殊齿轮为例介绍了电子柬焊接工艺的实际应用。 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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电子束焊接作为一种新型的焊接工艺在齿轮加工中得到越来越广泛的应用,在某公司双联齿轮加工中,由于产品结构限制,过去只能采用插齿工艺,采用插齿工艺加工效率低,加工质量差,而且对插刀的损耗大;目前采用电子束焊接后,可以将双联齿轮分开,分别滚剃齿加工后,然后焊接在一起,提高了加工效率,保证了产品质量,而且大大降低了生产成本。 相似文献
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电子束焊接温度场实时监测系统设计 总被引:1,自引:0,他引:1
焊接温度场是影响焊接质量和生产效率的主要因素,因此对焊接过程中的温度场分布进行监测就显得极为重要。利用普通彩色CCD构成了焊接温度场实时测量系统;基于工件热辐射随温度变化单调上升特性建立了温度场测量模型;采用最小二乘法对实测的温度数据进行分析,得到了温度场测量模型的最佳参数。试验结果表明了该监测系统的可行性。 相似文献
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电子束焊接在运输机械传动部件中的应用 总被引:1,自引:0,他引:1
简要介绍电子束焊接技术的基本特点,着重分析电子束焊接技术在汽车变速箱、重型卡车桥壳、摩托车传动离合器、工程矿山机械动力换档变速箱离合器以及联合收割机传动轴等方面的应用。 相似文献
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Effects on mechanical properties in electron beam welding of TC4 alloy by laser shock processing 总被引:1,自引:0,他引:1
Lu Jinzhong Zhang Yongkang Kong Dejun Ren Xudong Ge Tao Zou Shikun 《Frontiers of Mechanical Engineering in China》2007,2(4):478-482
The surface of TC4 titanium alloy welding line by electron beam welding (EBW) was processed by high power Q-switched and repetition-rate
Nd: glass laser. Effects of laser power and spot diameter on residual stress and microhardness of the TC4 alloy welding line
by laser shock processing (LSP) have been analyzed. Results show that residual stresses almost do not change as laser power
is 45.9 J, spot diameter is ϕ9 mm; While laser power is 45.9 J, spot diameter less than ϕ3 mm, the distribution of residual
stress in welding line occurs obvious variation, which residual stress increase obviously with spot diameter decrease. When
power density is bigger than 1.8 × 1010 W/cm2, residual stresses of electron beam welding line occur change by LSP, which improve obviously residual stress distribution;
while laser power is bigger than 1.2 × 1010 W/cm2, the surface micro-hardness of electron beam welding line occurs change by LSP, which improve obviously micro-hardness distribution.
Mechanical properties of TC4 titanium alloy welding line will be improved by LSP, which provides experimental foundation for
further controlling the distributions of residual stress and micro-hardness during laser shock processing.
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Translated from Journal of Jiangsu University (Natural Science), 2006, 27(3): 207–210 [译自: 江苏大学学报 (自然科学版)] 相似文献
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Limit load solution for electron beam welded joints with single edge weld center crack in tension 总被引:1,自引:1,他引:0
Limit loads are widely studied and several limit load solutions are proposed to some typical geometry of weldments.However,there are no limit load solutions exist for the single edge crack weldments in tension(SEC(T)),which is also a typical geometry in fracture analysis.The mis-matching limit load for thick plate with SEC(T) are investigated and the special limit load solutions are proposed based on the available mis-matching limit load solutions and systematic finite element analyses.The real weld configurations are simplified as a strip,and different weld strength mis-matching ratio M,crack depth/width ratio a/W and weld width 2H are in consideration.As a result,it is found that there exists excellent agreement between the limit load solutions and the FE results for almost all the mis-matching ration M,a/W and ligament-to-weld width ratio(W-a)/H.Moreover,useful recommendations are given for evaluating the limit loads of the EBW structure with SEC(T).For the EBW joints with SEC(T),the mis-matching limit loads can be obtained assuming that the components are wholly made of base metal,when M changing from 1.6 to 0.6.When M decreasing to 0.4,the mis-matching limit loads can be obtained assuming that the components are wholly made of base metal only for large value of(W-a)/H.The recommendations may be useful for evaluating the limit loads of the EBW structures with SEC(T).The engineering simplifications are given for assessing the limit loads of electron beam welded structure with SEC(T). 相似文献
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