Simple sleeve for punching aluminum plug

The invention provides a simple sleeve for punching an aluminum plug, and belongs to the technical field of engine machining. The simple sleeve for punching the aluminum plug comprises a cylindrical seat body, an inner hole A and an inner hole B which are different in diameter, consistent in axis and communicated with each other are formed in the cylindrical seat body, the hole diameter of the inner hole A is smaller than that of the inner hole B, and the aluminum plug is plugged at the bottom of the inner hole B; the mandrel is composed of a cylindrical block A and a cylindrical block B which are different in diameter and consistent in axis, the diameter of the cylindrical block A is smaller than that of the cylindrical block B, the cylindrical block A is movably inserted into the inner hole B to be attached to the inner hole A and then continues to extend towards the outside of the cylindrical base body, and a rubber external thread is arranged at the end, away from the cylindrical block B, of the cylindric