Special clamp for machining inner diameter of symmetrically-split aluminum cylinder part

The utility model relates to a special clamp for machining the inner diameter of a symmetrically-split aluminum cylinder piece. The special clamp comprises a body, a radial adjusting screw, a center shaft, a three-jaw chuck and a sleeve. One end of the center shaft is fixedly connected with the three-jaw chuck, a square groove is formed in the circumference of the other end of the center shaft, the center shaft is placed in the body, the four radial adjusting screws penetrate through the body and are screwed into the square groove of the center shaft to be fixed, and a gap is formed between the square groove and the diameter of a radial adjusting screw positioning shaft; the three-jaw chuck clamps the outer diameter of one end of the sleeve, and the center frame is supported on the outer diameter of the other end of the sleeve. According to the utility model, the precision requirement of the inner hole of the symmetrically split aluminum cylinder part is ensured, the positioning of the part and the clamp and