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Free bending with no bottoming is commonly applied in various industrial productions because of its versatile forming characteristics. And full application in the large-diameter longitudinal welded pipes production shows the superiority of this forming method. This paper adopts a scientific experimental design method to carry out physical modeling and simulation study on the wide-plate air bending...
Large-diameter longitudinal welded pipe is the main form of energy transport, and used widely in the area of oil and gas transportation. In this paper, large-diameter longitudinal welded pipe forming methods are introduced, and a review on recent research results of finite element simulation technology in the production of large-diameter longitudinal welded pipe are made, in particular JCO/JCOE pipe...
Multi-step bending is the key manufacturing technology of large-diameter straight seam submerged arc weld (LSAW) pipes JCO. The aim of this search is to predict the precise final geometry of the pipe after forming because the considerable elastic recovery during unloading leading to springback affects the precision in dimension. In this study the JCO forming process for X-80 pipe with wall thickness...
Attribute discretization is one of the key issues for the Rough Set theory. First, a method is proposed to compute an initial cut points set. The indistinguishable relation of decision tables did not change, and the number of elements in the initial cut points set was reduced. Then, the cut point information entropy was defined to measure the importance of a cut point. Finally, an attribute discretization...
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