電動ドライバDP-600によるねじ締め

概要

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We have studied the characteristics of fastening screw with a screwdriver DP-600 We fastened a plate of 0 6 mm thick with an M2 screw Plate and screw were made of brass and iron, respectively They had both Ni coating At first, both the impulsive torque T_<imp> and the ratio of loosening torque to final torque Tj/T_<fin> increased linearly with times of repeating measurement Metal fatigue is considered to occur in the screw by suffering from a large T_<imp> at screw seating For setting torque from 200 to 300 gf・cm, the screw behaves elastically at bit revolution rates up to 860 rpm In this region, Timp doesn't overcome the setting torque, and Tj/ T_<fin> takes a value of 70 % independent of the revolution rate Hold time dependence was also studied Although T_<imp>'s are the same, Tj/T_<fin> increases linearly against hold time Hold time serves to secure fastening screw However shortening of a fastening time is requested, one should not reduce hold time
2002-06-30