REDUCING ROLLING MILL Russian patent published in 2006 - IPC B21B17/14 

FIELD: rolled tube production, namely manufacture of sheathing determined-contour section by cold reducing of hollow welded blank.

SUBSTANCE: reducing mill for cold reduction of sheathing determined section of hollow welded blank such as tube includes accumulator, inlet roller table, housing supporting successively arranged stands, technological sizing tool. Knocking out roller table, drive unit of mill and control panel. Technological sizing tool includes row of two-roll shaping roll grooved passes mounted in housing without shift of their parting planes and arranged one after another. It allows form by initial reduction in first stands shaping ribs of section; by further reducing simple-geometry basic surfaces, basic surfaces with more complex shape, rolling triangular bent portions and forming grooves on vertical end strut and on supporting site. Parting planes of all two-roll passes are arranged in the same plane. Summed (for two rolls of each stand) perimeter of cross sections of roll passes while taking into account protrusions, recesses with rectilinear and (or) curvilinear surfaces is equal to perimeter of initial hollow welded blank. Mill also includes sets of non-driven rollers whose rotation axes are normal to rotation axes of rolls. Said non-driven rollers are mounted between first shaping stands. Multi-roll roll grooved passes are used for finally sizing and straightening ready product with possibility of compensating admissible fluctuations of hollow welded blank. Drive unit is in the form of separate kinematic circuits with individual sources of torque for providing constant revolution number of rolls in all stands. Diameter of roll grooved passes are calculated according to condition of constant drawing speed of section through all stands and similar cross section areas of each intermediate section and initial blank. Invention provides possibility for acting upon stress-deformed state of metal in deformation zone for producing sheathing preset-contour section of widely used in industry welded tube 114 x 3 mm in manufacturing mode optimal from view point of metal state, deformation intensity and comfortable condition of tool operation.

EFFECT: simplified design and adjustment of mill, enhanced accuracy of products, lowered energy consumption.

5 dwg