ボルト・ナット結合体のゆるみに関する研究(第3報) : 作用荷重が小さい場合のボルト・ナットの変形量を考慮した検討

概要

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Bolt nut units sometimes loosen due to a rotation of the screw thread under repeated axial loding. In the previous paper, the authors demonstrated that the self-loosening was caused by a relative slip between the expanded nut threads and the contracted bolt threads. In addition, it was shown that a tendency of the numerical results on the thread loosening showed good agreement with the experimental results. However,, the estimated values were not well agreed with the experimental values since the load distributions at the engaged screw thread were assumed to be uniform. In the previous paper, an amount of the loosening angle was measured by a microscope. In this paper, an amount of the loosening angle could be measured continuously by using an electric micrometer. In addition, by measuring the friction coefficients of the screw thread and the bearing surfaces an estimation whether loosening angle is occurred or not is made. As a result, it is shown that the estimated loosening angle of screw thread, taking the load distribution at the engaged screw threads in an initial clamping state and the bolt and nut deformations into consideration, are fairly consistent with the experimental results.
公益社団法人精密工学会の論文
2003-12-05