Spinning method of variable diameter pipe dieless floating rolling ball and fixture

One kind reducer Dieless floating ball spinning method and a jig, by special fixture designed for multi-pass spinning tube segment, particularly the process comprises determining a reduced diameter section outer diameter of each sample by rotating, for each reduced diameter segments of the segmented spinning, spinning and reasonable control amount of each of the spinning process, the finally obtained tube after molding. Spinning tubes of the present invention, the austenitic stainless steel for molding, alternatively strong, easy operation and high efficiency. Since the austenitic stainless steel of low strength, elongation of 40% or more, plastic, and is conducive to a reduced diameter, spinning ball applications with good results. Fixture proposed by the invention can effectively control the thinly walled tube at the diameter reduced diameter, reducers solves the technical problems of local necking. The fixture is simple in principle, the rational use of the lathe function, and easy to process, low manufacturing cost.