Coil of tapered wire

B - Operations – Transporting – 21 – F

Patent

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Details

140/10

B21F 35/00 (2006.01) B21F 3/00 (2006.01) B21F 3/02 (2006.01) F16F 1/04 (2006.01)

Patent

CA 1309318

ABSTRACT OF THE DISCLOSURE A coil of taper wire for forming coil springs, formed by winding substantially in concentric loops a quench-hardened and tempered taper wire having a successive arrangement of taper wire segments each consisting of a thick section, two thin sections and two taper sections connecting the thin sections to the opposite ends of the thick section, respectively. The taper wire is subjected to a preforming action immediately before being wound in loops on a winding drum, to form plastic bends in the thick section and plastic bends of a radius of curvature greater than that of the plastic bends in the thick sections so that the taper wire is wound substantially uniform, concentric circular loops on a winding drum. When the taper wire is unwound from the coil and is subjected to a straightening process of a fixed straightening arrangement of a series of straightener rollers before being coiled in taper wire coil springs on a coil spring forming mill, the thick sections undergo a straightening action greater than that acts on the thin sections, so that the taper wire unwound from the coil of taper wire is straightened in a substantially straight taper wire and thereby the taper wire is coiled in taper wire coil springs having correct size and uniform shape.

542432

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