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扭—压复合加载变形基础的研究 总被引:6,自引:0,他引:6
扭-压复合加载成形工艺是一种有效地利用工件与工具间摩擦的有害作用,达到减小变形力,改善工作组织性能的新方法。本文介绍了实现扭-压变形的实验装置,并对工艺因素对扭-压复合加载变形的影响作了阐述。 相似文献
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扭压变形的准三维刚塑性有限元分析 总被引:2,自引:0,他引:2
本文探讨应用刚塑性有限元模拟扭压变形(变形中沿坯料高度方向施加压力,同时沿横截面方向施加扭矩)时所遇到的具体处理技术,提出一系列算法,开发了镦粗、扭压变形通用的有限元模拟软件,并用该软件将扭压变形时金属的流动规律同一般镦粗时的情况进行了分析、比较。 相似文献
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镦粗时在模具上增加扭矩能将接触摩擦从被动的阻力变成促进金属流动的动力,这样会降低成形载荷,且使变形均匀。本文利用有限元模拟软件DEFORM-3D,模拟材料A12017的圆柱体在室温下的扭压复合加载成形。分析证明,附加扭矩将优化传统镦粗变形。 相似文献
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LC4铝合金呆扳手成形热力学参数的确定 总被引:1,自引:0,他引:1
通过试验研究了LC4铝合金呆扳手成形的温度、变形程度、变形速度、加热方式和加热速度等成形热力学参数与成形质量之间的关系。解决了试验过程中出现的一些问题,确定了最佳成形工艺参数为:始锻温度400~450℃、终锻温度350℃左右,第1阶段的变形量为30%~50%,第2阶段的变形量为75%。 相似文献
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Xue Kemin Zhang Zhengrong Xia Yongjiang Lu Yan Metal Forming Division # Harbin Institute of Technology Harbin 《中国有色金属学会会刊》1997,(4)
COUPLEDTHERMOMECHANICALFEMANALYSISOFTWISTCOMPRESSIONDEFORMATIONPROCESS①XueKemin,ZhangZhengrong,XiaYongjiang,LuYanMetalFormin... 相似文献
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The hot compression tests of 42CrMo steel were performed in the temperature range of 850–1150 °C at strain rates of 0.01–10 s?1 and deformation degrees of 10–60% on Gleeble-1500 thermo-simulation machine. The optical microstructures in the center region of the section plane were examined. Based on the results from thermo-simulation experiments and metallographic analysis, the dynamic recrystallization mathematical models of 42CrMo steel were derived. The effects of processing parameters, including the strain rate and deformation temperature, on the microstructure evolution of 42CrMo steel hot upsetting process were discussed by integrating the thermo-mechanical coupled finite element method with the derived microstructure evolution models. The fraction of dynamic recrystallization and dynamic recrystallization grain sizes during the hot upsetting process of 42CrMo steel were predicted. The results show that the effects of strain rates and deformation temperatures on the microstructure evolution of 42CrMo steel hot upsetting process are significant, and a good agreement between the predicted and experimental results was obtained, which confirmed that the derived dynamic recrystallization mathematical models can be successfully incorporated into the finite element model to predict the microstructure evolution of hot upsetting process for 42CrMo steel. 相似文献
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The temperature rise caused by plastic deformation during the quick upsetting of tin-lead alloy and mild steel was investigated via experiments and numerical simulations aiming at a better understanding of the heat generation mechanism in friction welding. The results show that the compression amount and deformation temperature influence significantly the temperature rise during the upsetting of tin-lend alloy. The temperature rise increases with increasing the compression but decreases with increasing the deformation temperature. The simulation results are in good agreement with the experimental iaspection for Sn63A alloy. The simulation results of mild steel present a similar tendency with tin-lend alloy. Moreover, the temperature rise of mild steel at elevated temperatures is comparable to that of tin-lead alloy at low temperatures. 相似文献
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控制大型饼类锻件夹杂性缺陷的镦粗成形工艺研究 总被引:1,自引:1,他引:0
镦粗变形是大型饼类锻件的主要成形方式,夹杂性缺陷是其主要质量问题。镦粗变形使锻件心部的塑性夹杂有可能成为片状,这种片状夹杂在一定的力学条件下会产生微观乃至宏观裂纹。因此控制夹杂物的变形并防止产生夹杂裂纹是饼类锻件锻造工艺所要研究的主要内容。为此,本文分别研究了旋转进砧法、梅花布砧法、排砧法和圆弧砧法等四种镦粗工艺条件下,大型饼类锻件心部夹杂物的变形、金属变形及损伤因子的分布情况。分析结果认为旋转进砧法可以有效控制锻件内部的夹杂物形貌。 相似文献
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为提高六角头螺栓头部热镦成形工序的合格率,选取影响成形质量较大的加热温度、热镦速度、摩擦系数3个因素设计了正交试验,并利用有限元分析软件Deform-3D建立了热镦过程的热力耦合数值模型,用数值模拟的方法对热镦后坯料的等效应力、等效应变、损伤值和成形载荷这4个目标参数进行多目标优化分析,优化设计了A286高温合金六角头螺栓头部热镦成形的工艺参数。数值模拟结果表明:与厂家原有方案相比,当工艺参数优化为加热温度为1050℃、热镦速度为60 mm·s-1、摩擦系数为0.3时,各目标参数均有所改善,可大大提高工件的合格率及生产效率。采用经优化的热镦工艺参数组合进行生产试验,结果显示:螺栓头部成形效果好,满足该工序质量要求。本研究为实际生产提供了理论依据。 相似文献