METHOD FOR MAKING ARTICLES WITH GROOVES Russian patent published in 2004 - IPC

FIELD: plastic metal working, possibly manufacture of parts of rolled shapes having thickened protruded portions, for example backings of rail joints. SUBSTANCE: method comprises steps of using die sets for punching grooves in thick-wall portions of blanks of hypoeutectoid-class rolled shapes; applying to blank zones designed for punching grooves reduction effort according to condition of occurring in blank material stresses whose values are in range of one or two values of yield limit; additionally reducing portions of blank joined with grooves; selecting reduction effort value according to condition of eliminating blank deformation; fixing reduction state of blank in portions with grooves and in joined to them portions due to closing die set; punching grooves at fixed reduction state. EFFECT: enhanced efficiency, lowered labor consumption of making grooved parts. 3 cl, 2 dwg