Gang reamer for oil pump body

The utility model discloses a gang reamer for an oil pump body. First, second, third and fourth reamer portions are sequentially arranged at the left end of a cutter body of a large reamer from left to right, each reamer portion is provided with four blades that are uniformly distributed along the circumference, a PCD abrasion-proof layer is disposed at the position of a cutting edge of each blade, a center water passing hole is designed in the cutter body, two groups of water outlet holes are designed in the left portion of the center water passing hole, a water outlet of one group of water outlet holes is communicated with a blade of the third reamer portion, a water outlet of the other group of water outlet holes is communicated with a blade of the fourth reamer portion, four blades that are uniformly distributed along the circumference are arranged at the left end of a reamer body of a small reamer, a PCD abrasion-proof layer is arranged at the position of a cutting edge of each blade, the right end of the reamer body is inserted into the left portion of the center water passing hole of the cutter body, and an inserting portion of the reamer body is fixed together with the cutter body through screws. According to the gang reamer for the oil pump body, four structures on the oil pump body are machined through the four reamer portions on the large reamer and a small reamer portion, thereby, time of tool changing and a large part of time of feeding can be saved, and the machining efficiency is greatly increased.