ROLL GROOVED PASS SYSTEM OF MILL FOR COLD ROLLING OF SHAPED CONTACT WIRE Russian patent published in 2002 - IPC

FIELD: manufacture of contact shaped wires by cold rolling in continuous rolling mills with stands having rolls with mutually normal axes. SUBSTANCE: roll grooved pass system includes system of drawing passes and system of shaping double-groove passes having preparatory, rough, prefinal and final passes. Contour of final pass corresponds to profile of cross section of ready contact wire. Profiles of grooves of prefinal pass depend upon profiles of grooves of final pass forming contact surface and mounting portion of contact wire. Height of groove of each roll consists 0.1-0.3 of height of groove of prefinal pass. Central bottom portion of groove of each roll is horizontal, its length is equal to 1-2 mm. Profiles of roll grooves of rough pass are formed by symmetrical grooves of both rolls of slit pass. In preparatory pass profile of groove bottom of first roll has radius consisting 1-1.25 of radius of portion of final pass, profile of groove bottom of second roll has radius consisting 1.7-2.55 of radius of portion of final pass. EFFECT: improved design of final pass, elimination of underfilling of corner portions of bottom of final pass grooves adjoining to mounting portion of contact wire, enhanced accuracy of cross section size of ready contact wire. 4 dwg