Method of and apparatus for forming long metal tubing stock to tapered shape

An apparatus for forming a relatively long metal tubing stock to a tapered shape by means of the swaging process, comprising a plurality of swaging units which are arranged in a serial tandem configuration, each of said swaging units including:

• an outer cylindrical-shape flywheel;
• an inner cylindrical-shape assembly mounted inside said outer cylindrical-shape flywheel, said assembly including hammer rolls arranged at regular intervals around said assembly and spacer members each interposed between the two adjacent hammer rolls;
• a cylindrical-shape spindle mounted inside said inner cylindrical-shape assembly, said spindle having two longitudinal bucker grooves extending in parallel with the central axis of said spindle and diametrically opposed relative to each other, each of said two bucker grooves having a series of regularly spaced apertures formed in the bottom in the longitudinal direction thereof and aligned with the apertures in the other bucker grooves, a series of striking rods each inserted into each of said apertures movably in the radial direction of said spindle, and a bucker mounted between said series of striking rods in each of said bucker grooves and said inner cylindrical-shape assembly so that said bucker is pressed down by said hammer rolls in said inner assembly;
• working die means mounted inside said spindle, said working die means having two split parts extending longitudinally thereof;
• and
• driving means having output connected to said outer cylindrical-shape flywheel, wherein each of said working die means in each of said swaging units is interconnected one after another to form a continuous working sequence, and each of said driving means is connected to each of said outer cylindrical-shape flywheel.