プラスチックねじの締付けに関する基礎的研究

概要

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This paper deals with a fundamental considera-tion on the clamping force in tightening of bolted joint with plastics bolt (Polycarbonate, PC), tak-ing account of application of the torque control method, Tightening tests are carried out for two types of bolted joint which differ in material of nut and bearing plate which are assembled to PC bolt, that is, the material in Type I is PC and Type II is steel under the two conditions of lubri-cated and unlubricated, First, clamping force which can practically be introduced is clarified in consi-deration of torsion acting on the bolt shank in tightening, Second, possible clamping force is esti-mated by using the torque coefficient and it is compared with practical one. As the result, fol-lowing conclusions are obtained : (1) It is possible to obtain higher clamping force by lubricating as compared with unlubricating, (2) The lower limits of possible clamping force under lubricated condi-tion are . about 0. 84 and 0,60 times as much as proof stress o0,2 for Type I and Type II respective-ly, (3) The clamping force estimated from the torque coefficient agrees well with actual one for Type I under lubricated condition, but those are larger than actual one for other conditions.
公益社団法人精密工学会の論文
1984-12-05