FIELD: plastic working of metals. SUBSTANCE: stamp has punch with side undercuttings, matrix unit with bending device provided with two immovable halves of matrices, which are mounted with adjustable gap relative to punch, and pressure device mounted in axial opening of matrix unit. Each matrix half is positioned in spaced relation to punch, with size of space Z being at least equal to 1.57/3R+1.5S/-R, where Z is space between matrix half and punch, mm; S is billet thickness, mm; R is punch rounded edge radius, mm. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 1 dwg
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