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钛合金高速切削切屑形成机理的有限元分析 总被引:2,自引:0,他引:2
钛合金在切削加工时容易产生锯齿状切屑,周期性的锯齿状切屑会引起切削力高频波动,从而影响加工表面质量和刀具寿命。然而其切屑形成的机理尚无统一的结论。本研究采用刚塑性有限元模型以及正交化Cockroft—Latham断裂准则,对钛合金Ti6A14V高速正交切削进行了仿真。仿真结果显示,周期性断裂理论能很好地解释钛合金锯齿状切屑形成的机理,主剪切变形区应力状态的变化是裂纹萌生与扩展的主要原因。研究结论与相关试验切屑显微照片特征相吻合,可以为实现钛合金高速切削提供理论依据和技术支持。 相似文献
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针对高速加工安全性高、切削效率佳、工艺性好等独特的编程要求,构造出了以切削时间短、加工成本低、表面质量高为优化目标的,并以满足零件尺寸精度要求为约束条件的加工工艺方案评优模型。该模型已应用于自主开发的高速铣削Superman CAMⅡ原型系统中,以指导粗精加工刀轨的生成。实验结果表明:该模型具有合理性和实用性,对工艺人员编制高速加工工艺有一定的参考价值。 相似文献
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Modern manufacturing industry demands low cost and high efficient welding processes to remain competitiveness in the time of globalization. In this study, conventional gas metal arc welding (GMAW) was modified, a double-electrode GMAW (DE-GMAW) system is developed and DE-GMAW process is implemented through optimization of the design and process parameters and suitable selection of igniting sequence of double arcs. High speed welding tests were carried out to examine the effects of different factors on occurrence of weld formation defects. Through observing the weld bead appearance in DE-GMAW, the values of critical welding speed were determined under different levels of welding current and welding speed. 相似文献
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1. IntroductionThere exists a very thin transition domain between the arc plasma and the workpiecein TIG welding (D.C., workpiece-positive). This domain is called as the anode boundary layer within which there are very steep temperature gradient and various transportphenomena, such as energy, momentum and mass t.ansfe.11]. The complicated physicalprocesses occurred in the anode boundary layer directly dominate the values and distribution of current density and heat flux on the workpiece surf… 相似文献
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开展了高速活性气体保护( MAG)电弧焊接工艺实验, 确定出了不同焊接电流条件下形成驼峰焊道时的临界焊接速度、相邻驼峰之间的距离以及同一驼峰焊道“波峰”和“谷底”的断面形貌. 基于高速MAG电弧焊熔池的视觉检测图像, 分析了驼峰焊道的产生机理, 并利用上坡焊和下坡焊实验进行了验证. 同时, 也分析了保护气体成分对高速MAG电弧焊焊缝成形的影响. 相似文献
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高速MAG电弧焊驼峰焊道产生过程的实验研究 总被引:4,自引:0,他引:4
开展了高速活性气体保护(MAG)电弧焊接工艺实验,确定出了不同焊接电流条件下形成驼峰焊道时的临界焊接速度、相邻驼峰之间的距离以及同一驼峰焊道“波峰”和“谷底”的断面形貌.基于高速MAG电弧焊熔池的视觉检测图像,分析了驼峰焊道的产生机理,并利用上坡焊和下坡焊实验进行了验证.同时,也分析了保护气体成分对高速MAG电弧焊焊缝成形的影响. 相似文献