Convex upsetting disc for rapid forging machine and application of convex upsetting disc to forging of large forged materials

The invention discloses a convex upsetting disc for a rapid forging machine and application of the convex upsetting disc to forging of large forged materials, and aims to increase the yield of flat steel or modules forged from steel ingots. In order to achieve the purpose, according to the technical scheme, a 7-degree frustum is additionally arranged around a common upsetting disc hole, in the upsetting process of the steel ingots, due to stress of the frustum, the rear end of a steel ingot clamp handle is slightly concave inwards, round shoulders generated after the steel ingots are upset arereduced, and the flat steel end faces are flat and straight after the steel ingots are drawn out through the rapid forging machine in the later period. Compared with the prior art, the convex upsetting disc has the following advantages that the round shoulders generated after the steel ingots are upset are reduced, the head and tail cutting amount is reduced, the yield of the steel ingots is increased to 75% or above, an