FIELD: metallurgy.
SUBSTANCE: punch is made in the form of a body of revolution with a through central hole, two flat bases, the larger of which corresponds to the inner diameter of the branch. The shaping portion of the punch is formed by its smaller base and the side surface made by conjugation of the coaxial toroidal and conical sections. A stabilising portion is arranged between the shaping and shaping portions and is formed by a cylindrical surface. The forming portion is formed by a large base of the punch and a side surface consisting of successively joined coaxial conical, toroidal and cylindrical sections. According to the second version the punch additionally comprises a catcher in the form of a truncated cone which is smoothly joined to the shaping portion and provided with a supporting portion.
EFFECT: improved quality of t-pieces due to elimination of breaks.
5 cl, 3 dwg
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