共查询到16条相似文献,搜索用时 171 毫秒
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在焊接转子焊后去应力退火过程中,由于转子尺寸大、传热慢,转子内外温差较大,转子内部实际的温度场难以测试,热处理工艺参数,如加热速率、均温和保温时间、冷却速率等的制订没有可靠依据。采用扩展求解域的耦合换热计算模型,把热处理工件和热处理炉作为一个计算整体,把炉内的流体和固体都作为计算对象建立几何模型,同时考虑热处理炉内的辐射、对流和传导等换热方式,应用Fluent软件计算了热处理炉内气体和焊接转子的温度场,实现了热处理全程温度场的预测,获得了关键点的温度-时间曲线,模拟计算结果与实测结果吻合。焊接转子去应力热处理过程的模拟计算为热处理工艺设计和热处理炉控制参数的设定提供了依据。 相似文献
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建立了转子屏蔽套真空热胀形过程的二维轴对称有限元模型。借助非线性有限元软件MSC.Marc的二次开发功能,将Hastelloy C-276合金的蠕变本构模型与真空热胀形过程的有限元模型相结合,模拟了转子屏蔽套的真空热胀形过程。计算了真空热胀形过程中转子屏蔽套和模具内部的瞬时温度场和径向位移场,预测了转子屏蔽套的胀形量。研究了模具厚度、保温时间和保温温度等工艺参数对转子屏蔽套真空热胀形胀形量的影响。开展了真空热胀形工艺实验,模拟结果与实验结果吻合较好。 相似文献
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感应淬火电磁-热耦合场的有限元分析 总被引:3,自引:0,他引:3
从麦克斯韦方程组和导热微分方程出发,导出了轴对称感应加热工件的电磁场、感生涡流和温度场分布的基本方程;并以电磁场和温度场有限元分析为基础,建立了二维有限元分析模型,运用通用有限元分析软件ANSYS的耦合计算流程,对实际的工件感应淬火过程进行了仿真.计算中考虑了工件材料物理参数随温度变化对加热过程的影响.仿真结果形象地描述了感应加热中明显的邻近效应和集肤效应,试验工件的电流透入深度大约为3 mm.仿真温度分布曲线与试验曲线相吻合,说明仿真模型的准确性,为进一步研究感应淬火热处理加工过程提供了很好的依据. 相似文献
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钛合金筒形件真空热胀形壁厚效应的数值模拟 总被引:1,自引:0,他引:1
建立了钛合金筒形件真空热胀形的二维非线性热力耦合有限元模型。使用有限元软件MSC-Marc对钛合金简形件真空热胀形过程进行数值模拟。计算了钛合金筒形件真空热胀形过程的温度场和变形场,并进行了相应的实验验证。模拟结果与实验结果吻合较好。用建立的模型对真空热胀形过程中钛合金筒形件壁厚效应进行数值模拟,讨论了一定工艺条件下钛合金筒形件壁厚与弯曲角度、胀形量和残余应力之间的关系,为实际生产中制定和优化钛合金筒形件真空热胀形工艺参数提供理论与实践依据。 相似文献
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Numerical Simulation of Vacuum Heat Treatment Thermal Hysteresis Time of GH4169 Superalloy Workpiece 总被引:2,自引:0,他引:2
WANG Ming-wei ZHANG Li-wen JIANG Guo-dong ZHANG Fan-yun Li Chen-hui ZHANG Li-sheng ZHANG Zun-li . Department of Material Engineering Dalian University of Technology Dalian China . Shenyang Liming Aero-Engine Group Corporation Shenyang China 《材料热处理学报》2004,25(5)
GH4169is a Nickel-based superalloy,widely used inthe aero-engine.GH4169alloy workpiece usually heattreated in vacuum furnace.The advantage of vacuumheat treatment is that it prevent the surface ofworkpiece from oxidation,decarburization and getbright surface.In vacuum furnace heat transfer is dominated byradiation.Due to small heat capacity of vacuum heattreatment furnace,temperature of the furnace risesquickly to setting temperature during heating upprocess while the temperature of workpiec… 相似文献
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Numerical simulation of high pressure gas quenching of H13 steel 总被引:1,自引:0,他引:1
Jing Wang Jianfeng Gu Xuexiong Shan Xiaowei Hao Nailu Chen Weimin Zhang 《Journal of Materials Processing Technology》2008,202(1-3):188-194
Aided by the computational fluid dynamics software package FLUENT flow and heat-transfer model has been established to simulate the high pressure gas quenching process of a large H13 die. The complicate geometry mesh of finite volume method (FVM) simulation was exactly built according to the practical chamber set-up of vacuum furnace. The velocity and temperature distribution of gas, as well as the temperature field in H13 die, were obtained by simulation. The validation of simulation results has been carried out by comparing the simulated cooling curves of certain points inside the die with the measured ones. It can be found that the temperature depended thermal physical properties of gas and H13 die, such as thermal conductivity, specific heat and viscosity, have dramatic effects on the accuracy of simulation results. The possible improvement of the numerical simulation based on the detailed discussion is also elucidated. 相似文献
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边界对流换热系数和钢卷径向等效导热系数是影响燃气罩式退火炉内传热的两个最主?问1疚耐ü⒏志硭蔡却加邢拊抡婺P停哉质酵嘶鸸讨械奈露瘸》植冀辛四D饧扑恪DP透菔导释嘶鸸ひ涨呃词┘颖呓缣跫哂幸欢ǖ募扑憔取=岷戏抡婺P偷募扑憬峁贫烁咛季馄?CrV的球化退火工艺,获得了良好的球化退火组织,该钢的屈服强度、抗拉强度和布氏硬度等力学性能参数均得到明显改善。 相似文献
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S. Kolossov E. Boillat R. Glardon P. Fischer M. Locher 《International Journal of Machine Tools and Manufacture》2004,44(2-3):117-123
A thermal model of selective laser sintering (SLS) has been developed. The model allows for the non-linear behavior of thermal conductivity and of specific heat due to temperature changes and phase transformations. The temperature evolution and the formation of the sintered part are simulated by a 3D finite element analysis based on continuous media theory. It is shown that the effect of sintering has a strong influence on thermal evolution through changing the thermal properties of the material. The results of the model were experimentally tested and confirmed by temperature measurements. 相似文献