| 摘要 |
PURPOSE:To prevent the defect generation due to the slippage and buckling of a material by measuring the tension to be applied on the material and the compression state between the rolls in breakdown stage at preceding step for forming the resistance welded tube and by controlling the driving speed of one side of the upper and lower rolls. CONSTITUTION:A strip 1 is formed in tubular shape, the space between stands 23, 24 between the preceding step rolls 3, 4 of the resistance welded tube production line which welds by abutting both end parts is combined by a turn buckle 22 and the tensile strength or compression force applying thereon is measured 25 by an interposing strain gage. This measured value 25 is amplified 26, pulled by digitizing it by a memory 27 and compared 28 with the reference value of the compression force. The driving speed of the rolling reduction roll 3-2 is controlled 31 so that this comparison value 28 becomes zero. The generation of the slipping flaw of the material 1 and generation of the edge buckling are prevented by this control 31 to form the strip 1 in good shape.
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