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Positioning of pitch tools and the offset of coiling point for the pitching of coils in a single-point coiling system are investigated theoretically and experimentally.The main results obtained are as follows.1) The offset of the coiling point has more important effect upon the pitch of coils than the lift of pitch tools.2) The pitching process of coils by the offset of coiling point is due to the torsion of the wire between the wire guide and the coiling point. The relation between the offset and the pitch of coils becomes approximately linear.3) Elasto-plastic analysis is available especially for the case of pitching of coils because of its small torsinal deformation.4) The contact condition of the wire to the coiling tools has an important effect on the pitch of coils.
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