Machining tool and machining method for high-performance aluminum-lithium alloy variable-angle aeronautical part

The invention belongs to the technical field of aviation sheet metal part manufacturing, and particularly relates to a machining tool and method for a high-performance aluminum lithium alloy variable-angle aeronautical part, the machining tool comprises a special knife switch and a mold base, and the special knife switch comprises a die handle, a knife body, a knife head, a tool pin and a lifting bolt; the mold comprises a lower mold, an upper mold, a mold closing pin, a mushroom head positioning part and a lifting bolt; by means of the machining method, tolerance accumulation caused by multiple times of positioning in the aluminum-lithium alloy part combination forming process is avoided, and the problems that the aluminum-lithium alloy part is difficult to form and positioning errors exist are fundamentally solved. The tolerance of the appearance of the part manufactured according to the machining method in the natural state is smaller than or equal to 0.5 mm, and the hole site precision of all the guide ho