METHOD FOR PROFILING THIN-WALL SECTIONS OF FLAT BLANKS AT PRELIMINARY SHAPING STAGE AND UNIVERSAL APPARATUS FOR PERFORMING THE SAME Russian patent published in 2007 - IPC B21D5/06 

FIELD: plastic working of metals, namely manufacture of thin-wall sections.

SUBSTANCE: method comprises steps of cutting flat blank by two bands at preliminary shaping stage; removing burrs from cut line by micro-grinding; feeding cut blank to first profiling stand for preliminary shaping through two grooved passes. In second stand for preliminary shaping lateral deformed portions are bent by value depending upon mechanical properties of blank metal and used shaping schedule. Then cross corrugations are partially rolled out at leveling inner stresses and deformations along cross section due to increased rate of profiling in comparison with profiling rate in first stand for preliminary shaping. First and second profiling stands of apparatus being unit for preliminary shaping and they have working roll drive in the form of system of outer gear transmissions providing possibility for enhancing profiling rate at outlet of first stand. Profiling rolls are paired rolls mounted with possibility of separate profiling of two blanks and they have closed working gage. Shafts for mounting profiling rolls are in the form of inserts. Housing of stand unit is cast of two blocks parting along axis of upper shafts.

EFFECT: improved quality of sections, enlarged manufacturing possibility and enhanced efficiency of process.

5 cl, 6 dwg