Method for machining transmission chain wheel of oil pump

The invention discloses a method for machining a transmission chain wheel of an oil pump, which is used for constructing a chain wheel with the following structure: the chain wheel comprises a metal hub, a gear ring and a vulcanization integrated rubber body. The machining method provided by the invention comprises the following steps of: a, carrying out powder metallurgy to form a gear ring; b, vulcanizing: integrally forming a conventional metal hub without drilling and tapping the gear ring obtained in the step a, and a half finished product rubber through vulcanization; c, selecting a special tool and clamp, wherein the clamp is provided with a structure for clamping an outer circle of the gear ring and enabling an end face of the gear ring to tightly adhere to the tool; d, taking the end face and the outer circle of the gear ring as reference to drill and tap the hub; and e, finishing to obtain a finished product. By adjusting a process, the end face and the outer circle of the gear ring are used as the