In the production process of the Liaohe Oilfield Machine Repair Plant, it has encountered the problem of processing the cone hole of the oil drilling mud pump pump head. The net weight of the pump head is 910kg, and the outline size is long × width × height is 1090 × 840 × 790mm. The taper holes are distributed at four angular positions 215 mm and 530 mm from the upper end surface of the pump head. The taper hole has a large head size of 205 mm and a taper of 1:6.
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