共查询到20条相似文献,搜索用时 31 毫秒
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高颈法兰的颈部高度和底盘外径大,采用锻造后机加工的方法制作生产效率较低。为提高生产效率,通过对现有辗环工艺进行分析,借助有限元软件建立了高颈法兰精辗模型,并对典型规格的外径Φ159 mm的高颈法兰轧制成形过程进行了仿真分析,研究了驱动辊转速、芯辊进给速度、毛坯形式对高颈法兰轧制成形过程的影响。结果表明:增加驱动辊转速与芯辊进给速度可以减少轧制缺陷,同时采用锥形内孔可以避免内孔产生蝶型缺陷。最终确定了法兰内孔形式为锥形内孔、驱动辊转速ω=5 rad·s-1、芯辊径向进给速度V=3 mm·s-1。最后设计配套模具进行试验验证,完成了典型规格高颈法兰的产品试制,验证了高颈法兰碾环成形工艺的可行性。 相似文献
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《特种铸造及有色合金》2015,(9)
基于ABAQUS/Explicit平台建立了AZ31镁合金环件径轴向热轧的三维弹塑性热力耦合有限元模型,分析了芯辊直径对成形环件的应变和温度分布不均匀性以及轧制性能的影响。结果表明,随着芯辊直径的增加,成形环件的等效应变和温度分布越来越均匀;同时轧制力和径向轧制力矩逐渐增大,轴向轧制力矩逐渐减小。 相似文献
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单件冷轧成形的圆锥滚子轴承套圈存在锥度大、翘曲严重的问题,为了提高圆锥滚子轴承外圈的冷轧成形精度,采用理论分析、有限元模拟与实验验证相结合的方法,研究冷轧外圈成形工艺中的毛坯设计与优化方法,设计合理的冷轧毛坯。研究揭示了圆锥外圈单件冷轧过程中的套圈塑性变形与几何形状的演化规律,验证了毛坯设计的合理性与可行性,指出毛坯横截面积沿轴向的分布对套圈冷轧成形精度有着重要影响。同时,分析了轧制过程中作用于芯轴的轴向力的变化情况,指出轧制初期芯轴承受的轴向力较小,随着变形量增加,承受的轧制力增加,在轧制后期承受的轴向力达到最大。 相似文献
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离子渗金属中等离子体参数与工艺参数的相关性 总被引:5,自引:0,他引:5
用朗缪尔单探针技术对离子渗金属中的等离子体参数进行了诊断,讨论工艺参数对等离子体参数的影响。结果表明,随着工件阴极电压、源极电压和气压的增加,等离子体密度增大。利用等离子体参数结合放电特征对工艺参数进行了优化限定。讨论了等离子体参数对渗层成分的影响。 相似文献
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Electropolishing has been used in NiTi alloy in several fields for its special characteristics, but its essential details and electropolishing mechanism have not been reported yet as a demand from business competition, which, to a great degree, restricts the application and extension of the electropolishing technology. The effect of processing parameters on nitinol electropolishing was explored. Besides the electrolyte, other factors that influence the electropolishing are temperature, current density, time, spacing between anode and cathode, electrolyte stirring, etc. Studies on the effect of the temperature on the electropolishing process show that the higher the temperature is, the bigger the electropolishing rate is, following the near Gauss law. The relationship between the temperature and the surface roughness follows a near parabolic law, and the relationship between the temperature and the surface reflectivity follows a near sigmoidal law. The relationship between the electropolishing voltage and the current density follows a near cubic law, while that between the electropolishing rate and current density follows a near linear law. The relationship between the electropolishing rate and the time follows a near sigmoidal law. The practical spacing between anode and cathode is confirmed by the Hall bath experiment. 相似文献
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以2mm厚LF3铝合金薄板为对象,研究了在平均功率和焊接速度不变时脉冲YAG激光焊脉冲调制参数(脉宽、频率及单脉冲能量)对热导焊缝形状参数(熔深、熔宽及深宽比)的影响规律,并结合脉冲激光焊间断作用的特征,引入"有效峰值功率密度"综合考虑焊接速度、频率、脉宽以及光斑大小对焊缝形状参数的影响.此外,还对脉冲激光焊所形成的特殊的层状焊缝形貌进行研究和分析.结果表明,焊缝形状参数受脉宽及峰值功率密度双重作用的影响.脉冲焊得到的焊缝呈现多层状形貌,层数随频率升高而增多. 相似文献