Method for manufacturing thin-wall cylindrical member necking die

The invention relates to a method for manufacturing a thin-wall cylindrical member necking die, which comprises the following steps of: 1. precisely calculating and confirming reasonable necking coefficients and necking passes, wherein the step 1 has the key of well distributing the necking coefficients of all passes, to be used as a theoretical basis of necking die preparation; 2. scientifically and reasonably designing a multipass necking die structure to ensure easy material selection and processing manufacture; 3. establishing a feasible processing manufacture process to ensure the manufacture precision of the necking die; and 4. designing an installation structure of the die on an automatic necking press to ensure the positioning precision of the die. The die of the invention has the advantages of simple manufacture method, scientific and reasonable design, convenient installation and use and durability, and the invention can effectively ensure the quality of a thin-wall heterogenic cylindrical member during multipass necking, and is a novel method for manufacturing the multipass necking die and particularly suitable for various thin-wall cylindrical members during necking.