Split type duplicate gear and preparation method and assembly method thereof

The invention discloses a split type duplicate gear and a preparation method and an assembly method thereof, and belongs to the technical field of duplicate gear machining, cast blank raw materials of the duplicate gear comprise the following components in percentage by mass: 0.45-0.60% of carbon powder, 0.80-0.90% of manganese powder, 1.10-1.20% of chromium powder, 0.05-0.10% of vanadium powder and the balance of electrolytic iron powder, all the components are uniformly mixed to obtain mixed powder, and the mixed powder is put into a mold for molding, so that the split type duplicate gear is obtained. A cold isostatic pressing machine is used for conducting cold isostatic pressing forming on the mixed powder, a plate type casting blank is obtained, by accurately controlling the content of all elements and conducting corresponding component design, the gear steel keeps higher cleanliness while having stable mechanical performance, and expansion instability caused by impurities during gear hot assembly is red