1997 年 1997 巻 42 号 p. 45-54
In this paper effects of intial curvature and torsion of wires and feeding conditions on the shape of formed coils are studied theoretically and experimentally. The main results are as follows; Curvature and torsion of the formed coils varies proportionally to the trigonometoric function of the inclination angle of the wire bundle plane from horizontal position. Especially, the vertical setting of the plane influences the curvature directly and the horizontal setting has big influence on the torsion of coils. When the intial torsional direction of wires coincide with that of formed coil, combined effect will be expected. The effect of feeding conditions on shape of formed coils seems to be less when the initial curvature and torsion become minimal. As the compressive force of feed rollers increase, the wire in front end of coiling pin become straighter, which reduces the effects of intial curvature and torsion of wires on coils.