Guiding type inner circle positioning cone body

The utility model relates to a part processing clamp in the mechanical industry, in particular to a clamp of a clamp of a rough turning external circle, wherein a wearproof ring-embedded workblank cylinder inner cavity is used as a positioning reference for an internal combustion engine, and particularly relates to a guiding type inner circle positioning cone body. The cone body comprises a cylindrical cone body which is formed by multiple fan-shaped petal bodies. The external surface of each of the fan-shaped petal bodies is provided with an axial protrusion. Each of the cone-shaped protrusions on the front end of the cone body is narrow in front part and wide in back part. The interior of each of the petal bodies is a cone-shaped cavity. The cone body is simple in structure, capable of preventing dross from affecting positioning precision and convenient to manufacture and process. The obvious beneficial effects are that improvement of positioning and processing precision of all kinds of external circular face parts can be achieved.