In the next stage of the thermal deformation of the die forging of the front axle head of the automobile, the tension and polygonal structure generated will not change any more. The reaming is mainly used for the mandrel die in the annular forging process, and it is introduced into the casting, but it is extended. The blank is stretched circumferentially between the mandrel and the upper anvil and repeatedly stretched until the inner diameter reaches the required size. The metal is located between the two holes, and therefore there is a punch in the groove that extends to the re-expanded hole, To achieve the required size of forging.

This method is used to forge large-diameter thin-walled die forgings, forged thin-walled parts with irregular shape, and the influence of microstructure and properties of titanium alloy shows that the increase of heating temperature of forging billet will lead to the reduction of phase content in the alloy, and the effect of prolonging holding time on the alloy phase content is less than the temperature of phase transformation point, and the heat is kept at an appropriate level. After isothermal forging deformation, the content of alloy phase can be maintained at more than 30%, And it has good mechanical properties.