METHOD FOR HOT EXTRUSION OF METAL AT ACTIVE ACTION OF FRICTION FORCES AND HYDRAULIC EXTRUSION PRESS FOR PERFORMING THE SAME Russian patent published in 1998 - IPC

FIELD: plastic metal working, namely hot extrusion of metal at active action of friction forces for manufacturing rods and shapes. SUBSTANCE: method comprises steps of placing blank in container and extruding it through die for receiving necessary shape and dimensions of product. Extrusion is realized by means of extrusion ram at simultaneously moving container and said ram. Motion speed of container is more than that of extrusion ram. Motion speed of container is set according to extrusion rate and temperature range of blank. Ratio of motion speed values of container and ram is in range 1.05-1.03. Hydraulic extrusion press includes front and rear cross beams rigidly secured to press frame. Main power cylinder and cylinders for moving container connected with high and low pressure circuits are mounted on rear cross beam. Traverse bar is secured to rear cross beam. Traverse bar supports additional cylinder, whose plunger carries extrusion ram. Extrusion ram, container and hollow cylinder are mounted coaxially with possibility of reciprocation motion along lengthwise axis. Hollow extrusion ram is secured to front cross beam of frame. Additional cylinder and cylinders for moving container are hydraulically connected with throttling device being in the form of at least one stabilizing cylinder. Stabilizing cylinder includes cylindrical body in which plunger is arranged. One of stabilizing members of said cylinder is secured to rear cross beam, another is rigidly connected with traverse bar. Inner cavity of stabilizing cylinder is connected with inner cavity of additional cylinder. EFFECT: enhanced efficiency of method, improved design of press. 25 cl, 4 dwg, 1 tbl