Complex formed multi-tooth tool and machining method and application method thereof

The invention relates to the technical field of special turning, in particular to a complex formed multi-tooth tool. The complex formed multi-tooth tool comprises at least two rough cutting teeth andat least one finish cutting tooth successively arranged in a feeding direction. The rough cutting teeth and the finish cutting teeth form a comb-like structure together. Each rough cutting tooth comprises a first cut-in surface of the rough cutting tooth, a top line of the rough cutting tooth and a later cut-in surface of the rough cutting tooth. Each finish cutting tooth comprises a first cut-insurface of the finish cutting tooth, a top line of the finish cutting tooth and a later cut-in surface of the finish cutting tooth. The later cut-in surface of the rough cutting tooth and the later cut-in surface of the finish cutting tooth are homodromous. The included angles between the first cut-in surfaces of all the rough cutting teeth and a vertical direction are larger than those between the first cut-in surfaces of