抄録
It is very important for bolted joints to control the clamp force. In the practical applications, torque control method is generally used as the tightening method for the bolted joints. However, in torque control method the clamp force is affected by coefficients of friction of between bearing surfaces and between mating threads. Therefore, the preliminary tightening experiment is necessary to obtain the clamp force with sufficient accuracy. This study aims to develop the tightening testing machine which can be applicable to wide ranges of fasteners with sufficient accuracy specified in ISO16047. It had been confirmed that the target accuracy could be cleared by using piezoelectric sensors as torque cells. In this report, the structure of testing machine with adapters is analyzed be FEM to improve the accuracy and the applicability. For this purpose, the stress distribution on the sensor surface and the deformation of the structure were analyzed, and the criteria to decide parameters have been obtained.
