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板宽和轧辊凸度对热轧板带凸度控制的影响赵铁勇1,肖宏1,王健1,杨霞1(1.河北省秦皇岛市燕山大学轧制设备及成套技术教育部工程研究中心)摘 要:针对通常在研究板带宽度变化对出口板凸度的影响时没有考虑辊系凸度这一因素,应用三维刚塑性有限元法,影响函数法,三维弹性有限元法,开发了一个分析板带热轧过程的分析软件.利用该软件研究了支承辊,工作辊的凸度从-0.5mm到0.5mm变化时,板宽的变化对出口带钢板凸度的影响规律.结果表明:支承辊,工作辊凸度为0时,板凸度随板宽的增大呈下开口抛物线分布,峰值拐点对应的板宽约为辊身......
宽板坯表面纵裂纹的探索分析王三忠1,王新志1,宋素格1,刘海强1,高新军1(1.河南省安阳市安阳钢铁集团公司第二炼轧厂)摘 要:重点分析了影响宽板坯表面纵裂纹的主要因素和各种因素间的相互作用,同时结合现场宽板坯的实际生产特点,主要从钢水质量,保护渣,水口浸入深度,结晶器,一次冷却,拉速等方面对工艺条件进行了优化,并取得了较好的控制效果.分析认为:生产宽板坯时,钢水w([S])控制在0.01%以下,同时尽量避开包晶区;保护渣液渣层大于10 mm,渣耗稳定在0.5~0.7 kg/t;水口浸入深度为110150 mm......
number Gr and local nanoparticle Grashof number Br. The results were also studied for various values of the physical parameters, such as the Weissenberg number Wi, the power law index n, the taper angle...*=0 uniform tube than that of the case of stenosis. Figures 7(a) and (b) shows the axial displacement of the balloon and taper angle f. By using the following parameters:t=0.5, α=45°, Fr=0.1, F=0.1, Wi......
rheocasting[7-8], liquidus casting[9], twin-screw rheomoulding[10], rotating barrel rheomoulding[11], swirled enthalpy equilibration device[12] and controlled nucleation method[13]. Nevertheless, efforts......
was deposited on Ti-6.48Al-0.99Mo-0.91Fe (mass fraction, %) titanium alloy by arc ion plating (AIP). Laser pulse heating was used to simulate the heat input and duration in a gun barrel during firing. Finite......
℃respectively, determined by differential scanning calorimetry. The semi-solid slurry was produced by low superheat pouring with shear field (LSPSF) which mainly consists of a rotating barrel, a slurry holder... (PT) and poured into the rotating barrel. The rotation speed (RS) of barrel was set at 30-120 r/min, the inclined degree of barrel was set at 30?, the rotating barrel was operated at a temperature......
, approximately 1.5 kg of the melt was poured into a rotating barrel at room temperature. The melt was collected in an accumulator at 650 °C. At the same time, sample slices were cooled rapidly with water... and barrel incline angle. A low pouring temperature benefits the survival of the nuclei formed and separated crystals. The rotative velocity of the barrel determines the level of radial shear......
of Nonferrous Metals, 2014, 24(4): 1041-1049. [8] SEO P K, LEE S M, KANG C G. A new process proposal for continuous fabrication of rheological material by rotational barrel with stirring screw and its microstructural evoluation[J]. Journal of Materials Processing Technology, 2009, 209(1): 171-180. [9] JI S, FAN Z, BEVIS M J. Semi-solid processing of engineering alloys by a twin-screw rheomoulding......
furnace at 710 °C. A predetermined dose of melt was then cooled to the temperature of (630±3) °C, and was cast over the rotating barrel which rotated at a speed of 90 r/mm, inclined at 20... pressure. The high cooling rate achieved by the mold allowed the capture of the microstructure at semi-solid state. In this work, liquid alloy flowed through the rotating barrel within 3 s......
process is performed by lowering the upsetting punch, as shown in Fig. 1(a). An arresting ring is positioned to prevent the material from flowing toward the outer edge, and a taper is designed... in plate thickness, hole diameter and flange height with upsetting height In the upsetting-flanging process, a taper structure is designed on the lower blank holder so as to promote a greater flow......
