張力法によるボルト締付け過程の解析

概要

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In fastening structural members by using bolts and nuts, the so-called pre-tension method is frequently used now in cases where the axial tension in the bolt must be controlled with high accuracy. This method consists of two processes, i.e., (1) the pre-tension process using an oil pressure cylinder and (2) the fastening process releasing the pressure in the cylinder after rotating the nut to the contact surface. The ratio of the axial tension in the bolt in the process (2) to that in the process (1) is termed the "Effective tensile coefficient" here. It is important in design to estimate its value. In spite of the importance of the pre-tension method, no papers for the analysis of this process have been published yet. In this study, the above mentioned two processes are analyzed using the finite element method and the relations between the effective tensile coefficient and design factors such as the grip length or the nominal designation of screw thread are clarified.
一般社団法人日本機械学会の論文
1987-08-25