Description
A hot dieless drawing method has been applied to both drawing of Ti- Ni shape memory alloy (SMA) wire and manufacturing of spring steel wire with tapered portions periodically repeated along its length. The maximum practical reduction of area obtainable in a single pass of dieless drawing and in the dieless tapering process is 40%-50%. In Ti-Ni SMA wire drawing, repeated combination of dieless drawing and conventional cold drawing has been employed, resulti