Apparatus for forming a point at the end of a metal tube by means of a drawing operation

An apparatus for forming, on a metal tube of predetermined diameter, an end portion having a diameter less than said predetermined diameter, characterized by comprising a die through which said end of the tube is passed in order to form said portion, and which is provided with a first substantially cylindrical bore of diameter less than the diameter of said tube, a second substantially conical bore coaxial to the preceding and of which the minimum diameter is equal to the diameter of said first bore and the maximum diameter is greater than said diameter of the tube, and at least three revolving bodies disposed in corresponding seats of said die provided in the zone comprising said second bore, each of said bodies projecting radially to a predetermined extent from the surface of said second bore towards the axis of the bore itself, and drive means arranged to axially move said die relative to said tube in order to bring said end of the tube inside said first and second bore and into cooperation with said revolving bodies.