HYDRAULIC PRESS AND METHOD OF DIE FORMING WITH ROLLING OF LENGTHY ITEMS Russian patent published in 2010 - IPC B30B3/02 B21J13/02 B21J5/02 

FIELD: technological processes.

SUBSTANCE: invention is related to metal forming and may be used to make lengthy items with ribs by means of die forming. Hydraulic press comprises bed plate with guides, where movable crosspiece is installed with upper die. Lower die is mounted on fixed crosspiece. Press is equipped with two pairs of power thrusts, which rotate on cylindrical journals. Journals are arranged at the ends of movable crosspiece. Two sliders are installed in guides by cylindrical journals. On these journals there are lower ends of power thrusts installed. Return hydraulic cylinders joined to sliders are fixed on bed plate. In order to avoid slipping of lower die versus upper one, there is teethed sector and spring-loaded rack provided. Upper and lower dies are arranged accordingly with flat and radius-convex working surfaces or accordingly radius-convex and radius-convex or concave working surfaces. Using upper die with radius-convex surface, stock is exposed to rolling action with controlled force in process of return-rolling motion of upper die.

EFFECT: invention provides for improved accuracy of die forming and improved operational characteristics of press.

4 cl, 4 dwg