熱膨張法によるボルト締め付け過程の解析 : 接触面の熱抵抗を考慮した場合

概要

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Fundamental characteristics of the tightening process with a bolt heater have been evaluated in the previous report, where a numerical procedure for estimating the tightening process is proposed using FEM as an elastic contact problem in the transient temperature field. In this study, the effects of thermal resistance and radiation at interfaces are incorporated into the foregoing numerical approach for achieving better accuracy. It is clarified how the clamping force is generated in the cooling process of bolted joint. In addition, the tightening process of a bolted joint with larger grip length is also analyzed as an example of common engineering use. The effectiveness of the finite element approach proposed here is ascertained by comparing numerical results of temperature distribution and axial bolt force to experimental ones. An effective tightening procedure to control the axial bolt force with high accuracy is suggested by measuring the surface temperature of exposed threads and the elongation of bolt.
一般社団法人日本機械学会の論文
2000-04-25