Tool for machining thin-walled cylinder through positive and negative expansion of double taper sleeves and tool installation method

The invention relates to a tool for machining a thin-walled cylinder through positive and negative expansion of double taper sleeves and a tool installation method, and belongs to the field of machining. The tool comprises a first taper sleeve, a second taper sleeve, a mandrel and gaskets. The mandrel is sleeved with the first taper sleeve and the second taper sleeve. The gaskets are installed atthe two ends of the mandrel through locking nuts. The thin-walled cylinder is to be machined. The expansion tool capable of avoiding an inner ring rib of the thin-walled cylinder to be machined is manufactured, one-time clamping machining forming is achieved, the inner circle and outer circle size precision and inner circle and outer circle coaxiality of the thin-walled cylinder to be machined areguaranteed, and therefore the problem that clamping deformation is difficult when the thin-walled cylinder is turned is solved, the purpose that the outer circle of the thin-walled cylinder is machined on a lathe through one-