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near the flange and the root; while the wear of inner wheels mainly distributes around the nominal rolling circle. For the outer wheel of front wheelset of each bogie, the development of wear... methodology is introduced to simulate the wheel wear evolution of heavy haul freight car. The methodology includes the spatial coupling dynamics of vehicle and track, the three-dimensional rolling contact......
University Press and Springer-Verlag Berlin Heidelberg 2011 Abstract: The Circle algorithm was proposed for large datasets. The idea of the algorithm is to find a set of vertices that are close...: data mining; Circle algorithm; clustering categorical data; clustering aggregation 1 Introduction Clustering aims at providing useful information by organizing data into groups (referred......
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tools to control the roll wear evolution will lead to a contour with pronounced high spots in the case of same-width rolling campaign or an irregular contour shape in the case of mix cross rolling... control parameters was gained. A case study was conducted to validate the proposed roll shifting strategy, reducing uncontrollable quartic loading gap contour, improving strip profile and extending rolling......
(1) 其中:为表观黏度；和分别为剪切速率非常高和非常低时的黏度渐近值；为稠度系数；n为幂律指数；为剪切速率. 对于STF,虽然Cross模型能同时准确描述其低剪切速率下的类牛顿流体性质和较高剪切速率下的剪切增稠行为,但不能描述更高剪切速率下STF的剪切变稀.然而,冲击试验仿真中,高剪切速率下STF性能的精确表征对保证仿真结果准确性十分重要,因此,采用分段形式的Cross模型来表征STF流变性质,如下式所示: (2) 对质量分数为50%的STF流变曲线,以达到最大黏度时的剪切速率为分界点,将流变曲线划分为左侧[0,)的剪切增稠区间和右侧[,5 000]的剪切变稀区间,分别使用Cross模型对STF样品流变试验数据进行拟合,拟合参数见表1. 表1 分段Cross模型拟合参数 Table 1 Fitting parameters of segmented Cross model 分段......
薄板材的同板差,并获得良好的板形.研制出尺寸为3.0 mm×2 000 mm×≥6 000 mm的宽幅纯钛薄板,热处理后的结果显示,其力学性能完全符合标准要求,且板材表面质量,外形尺寸,同板差等各项技术指标均满足有关标准的技术要求. 关键词:三米三轧机；纯钛；宽幅薄板；叠轧 中图分类号:TG146.2+3 文献标志码:A Rolling... produced using two titanium sheets as a rolled group with the 3.3 m four-high reversing mill. The parameters of corresponding group billet, heating, rolling process were explored through the trial......
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Multi-objective optimization of rolling schedule based on cost function for tandem cold millCHEN Shu-zong(陈树宗)1, ZHANG Xin(张欣)1, PENG Liang-gui(彭良贵)1, ZHANG Dian-hua(张殿华)1, SUN Jie(孙杰)1, LIU Yin-zhong(刘印忠)2(1. State Key Laboratory of Rolling and Automation (Northeastern University), Shenyang 110819, China;2. Wei’er Automation Co., Tangshan Iron & Steel Co., Hebei Iron & Steel Group......
