FIELD: technological processes.
SUBSTANCE: invention relates to metal forming. Perform perforation and distribution of the resulting hole with the fixation of the element between the matrix and the holder. Then re-perforation of the part surrounding the perforated hole, expanding under the action of force in the process of distributing the hole, is carried out. Next, burring with the formation of a vertical wall is carried out.
EFFECT: invention can be used for burring in metal sheet elements.
7 cl, 6 dwg
