The utility model discloses a model device for gear production, which relates to the technical field of gear production and comprises a lower die, a temperature
detector is fixedly mounted on one side of the lower die, a gas
cap device is arranged in the lower die, an air inlet
pipe is fixedly mounted on the other side of the lower die, and a gas outlet
pipe is mounted on the other side of the lower die. And a control valve is fixedly mounted in the middle of the air inlet
pipe, a heating pipe is fixedly mounted at the top of the interior of the lower mold, and a heating device is fixedly mounted on one side of the heating pipe. According to the model device for gear production, an upper mold is pushed by an electric push rod to slide downwards on the outer side of a supporting rod through a sliding ring, so that the upper mold is driven to move downwards, the upper mold and a lower mold are attached, injection molding is conducted through an injection molding pipe, and before injection molding, liquid in a heating pipe is driven to be circularly heated through operation of a heating device; therefore, heating treatment of the lower mold is achieved, and the problem that due to the fact that the temperature of the lower mold is too high and the injection molding hole is small, the injection molding hole is solidified and blocked is solved.