FIELD: straightening of round shaped rolled pieces and sheet material. SUBSTANCE: apparatus includes two clamping heads with upper and lower clamps in the form of stationary wedge members, movable wedge members, jaws holding straightened article, hydraulic drive for moving movable wedge members and reversing mechanism for moving heads. Hydraulic drive for moving movable wedge members includes hydraulic cylinders mounted in wedge members joined with hydraulic station by means of high pressure line having non- return valve. Draining line having safety valve is connected with high pressure line between non-return valve and hydraulic cylinders. Safety valve includes mechanism for setting predetermined pressure and mechanism for joining hydraulic cylinders with draining line. EFFECT: enhanced quality of straightening due to fixing movable wedges after relieving load and due to selection of clamping effort for each article. 3 dwg
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