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一、绪言过去,制造中径电焊钢管,大多采用辊式成形。近来,随着中径电焊钢管向高强度、大直径方向的发展,排辊成形的有效性,开始被人们所确认。日本川崎钢铁公司首先在26时中径电焊管机上采用排辊成形,自1978年10月投产以来,主要制造各种尺寸的薄壁高强度焊管,当然也包括厚壁高强度焊管。该设备的特点是:在粗成形段成对地排列着数十个排辊,并采用下山成形,因此,与辊式成形相比,边缘伸长小(使之趋于自然成形),生产效率高,产品范围大。
First, the introduction of the past, the manufacture of medium diameter welded steel pipe, mostly roll forming. Recently, with the diameter of the high-strength welded steel pipe to the development of large diameter direction, roll forming effectiveness, people began to be confirmed. Japan Kawasaki Iron and Steel Company at 26 o’clock in the first electric roller pipe using roll forming, since its inception in October 1978, the main production of thin-walled high-strength pipe of various sizes, of course, including thick-walled high-strength pipe. The equipment is characterized in that dozens of rows of rolls are arranged in pairs in the rough forming section and are formed using the descent so that the edge elongation is small (making it tend to be natural) compared with the roll forming, the production efficiency High, large product range.