| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.25 ( September 1991 ) Special Issue on 'H-Shapes with Fixed Outer Dimension' and 'Steel Pipe' ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of Rolling Techniques to Control Outer Dimensions of H-Shapes Hiroyuki Hayashi, Ikuo Yarita, Shinzo Saito, Yoji Fujimoto, Arihide Kawamura, Katsuhiro Takebayashi |
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Synopsis : The conventional universal rolling of H-shapes results in fixed inner dimensions that are governed by the roll sizes used. H-shapes produced by rolling fixed outer dimensions are more desirable for productivity in construction work. Kawasaki Steel has developed new method for hot rolling steel H-shapes which can produce rolled H-shapes with as high quality as that of welded H-shapes. To control the outer dimension of web depth, it was found through an experimental model rolling that web width reduction by a universal mill can maintain the web depth constant for differing flange thickness. This rolling method prevents the occurrence of web buckling, web off-centering and nonuniform web thickness, which are the main problems encountered in web width reduction. It was also found by model rolling experiments that grooveless edge roll were effective for controlling the flange width, which is the other outer dimension. These techniques have already been applied to the production of H-shapes, and the same quality for web off-centering and flange width as that of conventional products was obtained. These techniques have been able to produce a new type H-shape and also to realize a size-free rolling of H-shapes which is a main subject in the field of shape rolling. |
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