締付け中の予測によるねじの軸力管理 : トルク法のための一試行

抄録

With the aim of improving the calibrated-wrench method, an axial tension control method based on an in-process prediction of a final fastening torque is presented. The prediction is performed by the detection of the differences of the fastening torque and corresponding rotational angle or time between a set interval and by a comparative calculation between the above values of the differences and set values. Although the value of the compliance of the bolt-nut joint is requisite, a reliable control with respect to each fastening process is expected without the difficulty of knowing the torque coefficient. Experiments using an experimental apparatus aided by a personal computer show fairly good results under various conditions. Lastly, some problems in the accuracy of the control are discussed.