Machining fixture and machining method for inclined oil hole of rotary valve of hydraulic steering gear

The invention discloses a machining fixture and a machining method for an inclined oil hole of a rotary valve of a hydraulic steering gear, and relates to the technical field of drilling fixtures and drilling methods.The machining fixture comprises a fixed part, a rotary part, a positioning pin and a positioning mechanism, and the rotary part is provided with a circumferential limiting face and an axial limiting face which can abut against the rotary valve; the rotating part is rotationally arranged on the fixed part, the rotating part is provided with guide holes which are circumferentially arranged around the rotating axis of the rotating part and are coaxially opposite to inclined oil holes to be machined of the rotary valve one by one, and the positioning pin can be detachably inserted into the guide holes and the first inclined oil hole after drilling machining of the first inclined oil hole is completed; the positioning device is used for positioning the relative position of the guide hole and the resid