Method for forging isotropous rectangular shaft forging

The invention discloses a method for forging an isotropous rectangular shaft forging. The method comprises the following steps: upsetting and stretching a steel ingot to prepare a cylindrical forging stock; heating and upsetting the prepared cylindrical forging stock and then punching and reaming to form a circular forging; dividing the forging into a plurality of arc forgings along a diameter direction of the forging and then flattening and performing preheat treatment after forging; then cutting the forgings into rectangular shaft forgings in size as required. According to the method, the rectangular shaft forgings are designed by forging a circular ring; the circular ring is thermally cut into a plurality of circular arcs, then the circular arcs are flattened and cut into the rectangular shaft forgings as required according to a specific technique. By adopting the method, the metal flow direction during a forging deformation process is rationally controlled according to the isotropous mechanical property o