Abstract
To clarify the mechanism of differences of forming torque for screws with different cross-sectional shapes, we have compared the forming process of tapping screw type-3, a screw with circular cross-sectional shape, and C-TITE*3, a screw with cross-sectional shape of triangle. At first, we captured cross-section view of thread-formed shape of work piece and measured time history of forming torque by experiment. Next, we created finite element models of screws of each shape and thread-forming process was numerically simulated using Simufact Forming 2021.1 by MSC software. Comparing shape of work piece and curve of forming torque from analysis with that from test, validation was confirmed. In the latter half of this paper, we separately calculated torque for each part of surface of screw, and compared breakdown of the two. It was founded torque at top surface was dominant, and that of C-TITE was remarkably smaller than that of tapping screw type-3 because of difference in contact circumference.
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