The invention discloses a preparation method of a
titanium alloy bar for a
pedicle screw. The preparation method comprises the following steps: firstly, performing
rounding coarse straightening treatment on original rolled bar blanks by adopting a straight drawbench, then removing surface defects by using a flaying
machine, simultaneously performing
sizing determining operation at a
discharge hole, straightening in a vertical electrothermal straightening mode, and finally, performing
centerless grinding treatment to obtain a finished bar. According to the preparation method of the
titanium alloy bar for the
pedicle screw, the
rounding coarse straightening treatment is performed on the rolled bar blanks by adopting the straight drawbench, and a traditional two-roll or multi-roll straightening
rounding mode is replaced, so as to prevent
residual stress due to coarse straightening; the
residual stress generated by traditional two-roll or multi-roll fine straightening is removed by utilizing the vertical straightening mode, and the problem of
necking caused by unbalanced stress of a U-shaped groove of the
pedicle screw due to excessive inner stress of the
titanium alloy bar prepared in the prior art is solved; the preparation method has the
advantage of simplicity and is suitable for
mass production and
machining.