共查询到19条相似文献,搜索用时 203 毫秒
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肖轶 《机械工程与自动化》2010,(6)
设计了一种环缝旋流冷却喷嘴,并介绍了其在某钢厂圆钢控冷加工工艺中的应用情况,探讨了各工艺条件对圆钢最终组织、性能的影响.试验表明,该冷却喷嘴冷却能力约为常规直喷式冷却器的1.5倍,较常用湍流式冷却器冷却均匀,通过调节水流、水压等参数控冷,可改善圆钢的性能. 相似文献
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基于DEFORM-3D有限元平台,建立了Φ420/Φ280-380mm规格的GH690合金大型环件空冷过程的三维热弹性有限元模型,对难变形合金GH690大型环件空冷过程中温度场演化规律模拟仿真研究,对合理调整GH690合金大型环件冷却工艺,提高环件质量具有重要意义。 相似文献
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采用有限元软件Ansys中的实体单元、壳单元及子模型技术模拟钢板的轧后控冷过程,得到钢板冷却后的三维温度场.结果表明,子模型技术是一种可以方便获得最佳网格密度的方法;在同样的网格密度下,壳单元可以获得较实体单元更精确的结果,因而可以使用壳单元对钢板的轧后控冷过程进行高效率的模拟.进一步推广Prime提出的残余应力测量方法,将其应用于钢板残余应力的反演,实现单次切割反演,获得单个切割面处的残余应力分布;提出单向多次切割和正交多次切割方法,以获得钢板内多个截面处的残余应力分布,应用数值模拟验证残余应力反演方法的可行性.该工作为工程中获得钢板内三维残余应力场及预测钢板切割变形提供一种可行的方法. 相似文献
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基于大型非线性有限元分析软件MARC,建立了半连续铸造三维热力耦合的物理模型和数学模型及半连铸过程复杂的边界条件和热接触条件;模拟现场工艺变化规律,对铝溶体在凝固成形过程中的温度场和应力场进行仿真;通过改变结晶器冷却水量(改变一冷区和二冷区的界面传热强度)及拉坯速度等工艺参数,利用该软件系统综合分析了工艺条件的改变对铝锭温度场和应力场的影响规律.仿真分析结果与现场观测结果相吻合. 相似文献
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实心圆锥喷嘴喷雾单相区冷却性能模拟研究 总被引:1,自引:0,他引:1
喷雾冷却可获得高效散热效果,本文以深入分析喷雾冷却性能影响因素为目标,对不同实心喷嘴在多种运行工况下的喷雾过程进行了模拟,并分析了喷雾冷却单相区的换热性能.CFD模拟与部分文献试验结果比较验证分析,表明模拟结果可作为深入分析压力旋流喷嘴喷射过程,以及优化其设计和运行的参考. 相似文献
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食品冻干机冷阱室内气流组织数值模拟及节能优化研究 总被引:1,自引:0,他引:1
建立了冻干机冷阱室的几何模型,阐述了内部气流组织的控制方程及其边界条件.进行了有限元网格的划分,并采用数值模拟的方法进行了冷阱室内流场和温度场的分析.通过添加导流板前后的模拟结果对比,能够看出加导流板后的模型流场比不加导流板的均匀,能够对改善冷阱室内的气流组织起到一定的积极作用. 相似文献
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Coupled finite element analysis of MIG welding assembly on auto-body high-strength steel panel and door hinge 总被引:2,自引:2,他引:0
Wen-feng Zhu Chun Xu Lu Zeng 《The International Journal of Advanced Manufacturing Technology》2010,51(5-8):551-559
Automotive doors are assembled to auto-body side-frame through hinges by metal inertial gas arc-welding process. Because of thermal effect, the after-welding geometrical deformation of hinges seriously affects assembly accuracy of door position, causing functional problems such as poor sealing, abnormal sound during closing and opening, as well as large residual stress. In order to solve the complexity involved in auto-body arc-welding assembly process due to dynamic coupling between temperature field and structural field, a multi-field coupling finite element method employing the subroutine of commercial code ANSYS-APDL is proposed, and numerical analysis model is established in quantitative detail. Focusing on the arc-welding assembly process for the auto-body plate (which uses high-strength hot-dip galvanized steel), the promising lightweight material, and door hinge (which uses conventional low-carbon steel), moving heating source and birth–death element method are both adopted in this thermal–structural coupling analysis in order to obtain the complicated transient temperature distribution and mechanical stress behavior during the sequential formulation of arc-welding seam. Experiment is carried out to confirm the validity of this newly developed method, including temperature measurement by thermocouple and residual stress test by X-ray diffraction. The agreement between the experimental and numerical results is satisfactory, indicating the reasonability and feasibility of this method in lightweight auto-body assembly research. It can be concluded that the moving heating source multi-field coupling arc-welding model can strongly support the process parameters optimization for obtaining minimum weld deformation and residual stress. 相似文献
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Ying-chun Wang Da-yong Li Ying-hong Peng Li-guang Zhu 《The International Journal of Advanced Manufacturing Technology》2007,33(1-2):1-6
A finite difference model was developed and applied to calculate the temperature distribution and solid shell thickness profile
of continuous cast in a steel plant and to control the process of continuous casting. In the developed model, the optimization
module of the water distribution of secondary cooling zone was established according to the metallurgical criterion for billet
and target temperature controlling principle. The quantitative relation expressions of casting speed and water amount can
be regressed by the result data. Meanwhile, the non-linear material properties of specific heat and thermal conductivity as
well as phase changes during solidification were considered in the model. The calculated results of the model were in good
accordance with measured data in the steel plant. Finally, a continuous casting and control system was developed based on
the model. The relations between technology parameters including casting speed, cooling intensity, superheat of melt, and
the casting process were analyzed with the system. The system could also be used to predict the optimum process parameters
and the water distribution of secondary cooling zone on the new steel grade continuous casting. 相似文献
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目前关于钢管控制冷却的研究没有专门针对其关键问题传热边界条件进行深入分析。为此基于钢管热机械控制工艺实际,建立钢管控制冷却全尺寸物理模拟平台,测定28CrMoVNiRE油井管在水量11.4 L/min、气压0.2 MPa,水量11.4 L/min、气压0.3 MPa和水量18.0 L/min、气压0.3 MPa三种不同气雾控制冷却条件下的冷却曲线,通过反传热法计算钢管表面的热流密度和换热系数,分析钢管在气雾控制冷却条件下的传热边界条件。结果表明,影响钢管气雾控制冷却传热的关键因素是气水混合比,其最佳值为6~7;换热系数随温差ΔT的下降依次经历高温慢速增加阶段、中温稳定阶段和低温快速增加阶段。采用有限元正算法,验证了反传热计算结果的可靠性。钢管控制冷却后细化的微观组织验证了气雾控制冷却物理模拟技术的可行性。钢管控制冷却传热边界条件的确定对于实现钢管在线气雾控制冷却工艺具有重要的指导意义。 相似文献
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钢筋的调质处理生产线 总被引:3,自引:0,他引:3
根据建筑用钢材的标准,对普通圆钢的机械性能进行分析,设计了一套钢筋调质处理生产线,对普通圆钢进行调质处理,以遮到建筑用钢材的要求标准。首先对普通圆钢进行淬火处理,采用超高频感应加热,将其加热至920℃左右,保温,再清水淬冷。然后及时进行回火处理,通过中频感应加热,使其在420℃左右保温,再冷却。经过加热、保温、冷却等一系列的操作,使钢的组织结构发生变化,获得所要求的钢材的综合机械性能。经过反复试验,发现在淬火处理和回火处理之间设一个充气装置至关重要,它不仅加快了冷却速度,而且能破坏淬火加热时在钢筋表面形成的氧化铁皮。实践证明,用该套设备对圆铜进行调质处理,提高了钢材的综合机械性能,使其迭到了要求的标准,且又形成了流水生产线,提高了生产效率。 相似文献
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基于FLUENT的热管砂轮换热能力仿真分析 总被引:1,自引:0,他引:1
采用CFD软件FLUENT建立了热管砂轮的三维有限体积传热模型,通过改变砂轮外圆面热流密度和砂轮转速,得出对应参数条件下热管砂轮的温度场分布,并分析各参数对砂轮换热能力的影响.仿真实验结果表明:随着热源面热流密度的增大,砂轮外圆面温度越高;在冷端条件一定的情况下,提高砂轮转速能降低砂轮外圆面温度. 相似文献
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针对铝/钢异种金属薄板焊接时容易产生残余应力与变形问题,提出采用随焊冷却氩气激冷对其进行控制。建立随焊氩气冷却激冷铝/钢异种金属熔钎焊的数值分析模型,研究不同冷却距离对残余应力和变形的控制效果,探究随焊激冷技术控制焊接变形与残余应力机理;同时,进行随焊激冷铝/钢异种金属熔钎焊试验,对焊接温度场、残余应力与变形进行测量,验证模型的准确性。结果表明,采用最优冷却距离(d=10mm),进行随焊冷却氩气激冷焊接试验时,纵向残余拉应力峰值和残余压应力峰值分别减小42.1%和74.4%,横向残余拉应力峰值和残余压应力峰值分别降低11.3%和14.4%,铝板和钢板外边缘焊接变形量分别减小67.9%和69.5%。随焊冷却氩气激冷技术可有效控制铝/钢薄板焊接时产生的残余应力与变形。 相似文献