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空心钢
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     -steel,s.
     -,Ti-S.
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     Numerical Simulation of the Quenching Process of GCr15 Steel Tube
     空心圆柱体GCr15淬火过程的计算机模拟
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     The Study on Huge Welded Hollow Sphere Joints of Complex Spacial Steel Structure
     复杂空间结构巨型焊接空心球节点的研究
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     BOILER STEELS
     锅炉用
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     Hollow Type Stirrer
     新型空心搅拌器
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  hollow steel
Consist of a hollow steel tube slotted along the entire length and tapered at one end.
      
Determination of Fire Resistancs of Concrete Filled Hollow Steel Sections.
      
Effect of concrete filling on the fire resistance of hollow steel columns.
      
Experimental studies on the fire resistance of hollow steel columns filled with bar-reinforced concrete.
      
Experimental studies on the fire resistance of circular hollow steel columns filled with steelfibre-reinforced concrete.
      
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To obtain sound castings depends largely on the prediction and controll of the solidification process. Because it is difficult to directly observe the solidification of castings in the mould, the solidification process has been controlled for a long time chiefly on the basis of the experience and real measurement information. The rapid development of large scale electronic computer technique and different data calculations offers the possibility in mathematical simulation for the solidification process of castings....

To obtain sound castings depends largely on the prediction and controll of the solidification process. Because it is difficult to directly observe the solidification of castings in the mould, the solidification process has been controlled for a long time chiefly on the basis of the experience and real measurement information. The rapid development of large scale electronic computer technique and different data calculations offers the possibility in mathematical simulation for the solidification process of castings. In this paper, a mathematical simulation and tests simulating the solidification process of two ton hollow ingot were carried cut. The results show that the mathematical modeling is reasonably accurate and reliable and can correctly reflect the reae sclidification process of hollow ingot Therefore, the mathematical model was used here to simulate not only the tempelrature distribution and front line of solidification, but also solidification characteristics, secondary dendrite arm spacing and segregation in hollow ingot The results are satisfactory, which provide the basis for producing hollow ingots in our country.

健全铸件的获得在很大程度上取决于凝固过程的预测和控制,由于铸件的凝固是在铸型内进行而难以直接观察,所以长期以来主要以经验或实测资料作为依据来控制凝固过程。大型电子计算机技术和各种数值计算法的迅速发展给铸件凝固过程的模拟计算提供了条件。本文在2t空心钢锭凝固过程热模拟实验的同时,进行了数学模拟。计算结果表明,数学模拟数据合理、准确、可靠,能正确反映空心锭的实际凝固过程。在此基础上,本文对空心锭的温度分布、凝固前沿、凝固参数、二次枝晶臂距以及成分偏析也进行了数学模拟,并取得了满意的结果,为空心锭的实际生产打下了基础。

The internal deformation of the blank with height-to-diameter ratio H 0/D 0=1.0 during upset-forming has been quantitatively analysed and calculated,at the same time,the porosity closing way and the deformation required during forging have been analysed and calculated quantitatively and qualitatively.The characteristics of internal flaw in hollow ingots have been introduced briefly,and on the above analysis and calculation,in view of retaining ring function and cold deformation production requirements,the...

The internal deformation of the blank with height-to-diameter ratio H 0/D 0=1.0 during upset-forming has been quantitatively analysed and calculated,at the same time,the porosity closing way and the deformation required during forging have been analysed and calculated quantitatively and qualitatively.The characteristics of internal flaw in hollow ingots have been introduced briefly,and on the above analysis and calculation,in view of retaining ring function and cold deformation production requirements,the WHF forging process without upseting deformation has been made for forging retaining ring with hollow ingot.

对高径比 H0 / D0 =1.0的坯料镦粗变形时内部变形量进行了定量分析计算。并对钢锭中孔洞锻造时愈合方式及愈合所需变形量进行了定性定量分析计算。简述了空心钢锭内部缺陷特点 ,并在上述分析计算基础上 ,针对护环性能要求和冷变形生产需要 ,制定了用空心钢锭锻造护环的无镦粗变形WHF法锻造工艺

In this paper,based on the experiments for hollow ingots,the principle and key technology for producing the heavy hollow ingots has been analysed,the production process and experimental plans of 30t hollow Ingots and the quality situation of products have been introduced in detail.It has provided the scientific basis for further developing the heavy hollow ingots.

结合空心钢锭的试验 ,分析了大型空心钢锭制造的原理和技术关键 ,详细介绍了 30 t空心钢锭的制造过程、试验方案及所制产品的质量情况 ,为大型空心钢锭的进一步开发提供了依据

 
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