METHOD FOR FORWARD EXTRUSION OF TUBE-PROFILE ARTICLE Russian patent published in 2004 - IPC

FIELD: plastic working of metals, possibly manufacture of high quality tubes by extrusion process.

SUBSTANCE: method for forward extrusion of tube -profile product from solid blank during one stroke of press comprises steps of guiding solid blank heated until yielding temperature to container until it rests upon die; closing die hole by means of end-push plug; pressing out blank by means of plunger until filling with metal cavity of container without gap; piercing blank by predetermined depth; opening die hole due to removing end-push plug; placing piercing needle into die hole; loading plunger with working pressure and extruding blank into annular gap between piercing needle and die hole for forming tubular profile of article. Solid blank is guided to container until it rests upon die. Die hole is closed by means of end-push plug arranged in technological duct for tube. After opening die hole, piercing bottom-scrap for removing the last through hole of die. It provides accurate positioning of piercing needle in die hole.

EFFECT: minimum eccentricity degree of tube product, less loss of yield.

4 dwg