Twisting effects of wires during coiling and their application

摘要

It is clarified that the wire torsion caused by curved wires and the inclination of a reel plane influences the torsion of formed coils. Then, the effects of wire twisting in coiling on the pitch or on the initial tension of formed coils are elucidated. It is also clarified whether processing of the pitch or adjusting the initial tension of formed coils is possible without using coiling tools. It is also shown that the largest initial tension can be achieved by the wire twisting in coiling. Furthermore, it is clarified theoretically and experimentally that nonlinear helical extension springs can be obtained by changing the torsion of wires monotonically during coiling.