APPARATUS FOR EXTRUDING TUBES Russian patent published in 1995 - IPC

FIELD: metal pressure forming. SUBSTANCE: apparatus has coaxially arranged a container, a hollow punch, a die and a needle, having a cylindrical portion with a diameter being less, than a diameter of the container and a cone portion with and apex, turned towards the die. The needle has the cylindrical portion with the diameter being more than a diameter of an opening of the die; the needle is mounted in such a way, that it is spaced by a distance, measured along an axis of the container from its cone portion until a surface of the die and being more, than zero one, but less than the diameter of the die. An axis of the cone portion of the needle may be shifted or inclined relative to an axis of its cylindrical portion. The needle may have several cone species. Such structure of the needle enlarges manufacturing possibilities of the apparatus, providing possibility of making tubes with shifted opening and tubes with several openings or with smooth transitions from one opening towards several openings. EFFECT: enlarged manufacturing possibility of the apparatus. 4 cl, 9 dwg