Processing clamp and method for inclined pin hole in low-pressure inner cylinder cavity of steam turbine

The invention discloses a processing clamp for an inclined pin hole in the low-pressure inner cylinder cavity of a steam turbine, which is a U-shaped groove block, wherein the distance between the side walls of the U-shaped groove block is matched with the width of lugs around the inclined pin hole, the groove depth is equal to the height of the lugs, a plurality of mounting holes are formed on one side wall of the U-shaped groove block, the inside surface of the bottom wall of the U-shaped groove block is a plane vertical to the side walls of the U-shaped groove block, the outside surface of the bottom wall of the U-shaped groove block is an inclined surface which forms an angle alpha with the inside surface of the bottom wall, the angle alpha is the included angle between the axis of the pin hole and the surrounding end face of the pin hole, and a plurality of drilled holes are formed on the bottom wall of the U-shaped groove block in a manner of being vertical to the inside surface of the bottom wall. The