A device for the manufacture by hot stretching, in large length, of the hollow profiles and of the hard metals and alloys to deform. (Machine-translation by Google Translate, not legally binding)

摘要

A device for the manufacture by hot stretching, in great length, of the hollow profiles and of the tubes of metals and alloys difficult to deform having a hollow of small straight section, which consists essentially of a cylindrical needle whose posterior end presents a frusto-conical expansion dimensioned in such a way that, at the end of the stretching, the needle stops having all the contact with the stretched product, said device being characterized because the height of the truncated cone and the useful length of the needle are substantially in the same proportion as the initial and final lengths of the metal to be deformed; and because the half angle of the apex of the truncated cone is between 2 and 10º. (Machine-translation by Google Translate, not legally binding)