At present, it is controversial whether the honing process of the outer gear of the melt gear pump can reduce the gear accuracy. However, as long as technological measures are taken, the gear accuracy can be maintained, the roughness of the tooth surface can be reduced, the burr can be removed reliably, and the knocking damage can be prevented, the gear rotation noise can be effectively reduced. For the whole transmission, in the assembly process, we must strictly operate the rules, conscientiou