ローラひずみ取機の研究 : 第2報, 丸棒, 円管のひずみ取りについて

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タイトル別名
  • On the Roller Straightener : 2nd Report, Straightening of Round Bars, Pipe and Tubings
  • ローラヒズミ トリキ ノ ケンキュウ 2

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抄録

The rotary straighteners straightening round bar and tubes are discussed. The auther derived that the residual stress distribution in the bar straightened by the rotary straightener is such as a vortex alternate of tensile and compressive stress zones around the centre of the bar, which are not effected by the repeated rotary bending. To obtain the better straightness, therefore, the bar has to be bent more severely at point under the rolls, and receive more multiple rotary bending on the bar near the outlet in the straightener. For the rotary plastic bending of the bar, the direction of the bending moment is not coincide with that of the bending of the bar, and these is some angle between both directions, and therefore the power consume to the rotary plastic bending of the bar. In this point of view, the auther derived a formula to culculate the power required for straightening of the bar. The residual stress in the seamless tube straightened by a seven-roll rotary straightener is measured by the cutting removed method using an electrical resistance straingauge, and the auther shows a convenient culculating process for the above mentioned measuring method.

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