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Title |
Development of the Method for Inspecting the Clamping Force of Torque Shear Bolts Using the Electricity energy of Electric torque wrench
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Keywords |
토크쉬어볼트 ; 체결축력 ; 토크 ; 알고리즘 ; 에너지 torque shear bolt ; clamping force ; torque ; algorithm ; energy |
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Abstract |
The torque-coefficient of torque-shear type high-strength bolts is affected by the environmental factors, such as ‘wet’, ‘rust’, ‘exposure to air’ and workability during tightening high strength bolts. It is difficult to assume the direct tension induced into the bolt due to variation of torque-coefficient for torque-shear type high-strength bolts. Therefore, it is essential to measure tension loads of bolts and to verify the clamping force under construction. In this study, the manufacture of trial product was planned to identify the induced force into the bolts. The algorithm for a trial product was composed of the relation between electricity energy taken from torque shear wrench and tension force from hydraulic tension meter. The regression analysis equation to measure the direct tension was derived by statistical analysis using Minitab program. It is considered that the trial product is reliable tool to evaluate the tension force comparable to a commercial torque wrench.
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