ROLLING MILL STANDS

  The extension of the range of rolled products and assurance of the strip high quality require the utilization of the working stands with high reduction capacity.
  Heavy-duty working stands with the rolling force up to 100,000 kN and rolling torque up to 6000 kNm were manufactured at NKMZ.

UNIVERSAL HOT ROLLING MILL STAND 2500 of OJSC MMK

Vertical Horizontal Work roll diameter, mm 500 1200 Back-up roll diameter, mm   1600 Work roll barrel length, mm   2500 Back-up roll barrel length, mm   2500 Rolling force, kN 6000 50000 Rolling torque, kNm 1500 6000 Rolling speed, m/sec   5 Work roll axial shift stroke, mm   150

FOUR-HIGH FINISHING STAND ТЛС-3000 АМК

Work roll diameter, mm 900 Back-up roll diameter, mm 1650 Roll barrel length, mm 3000 Rolling force, kN 45000 Rolling torque, kNm 3000 Rolling speed, m/sec до 5

VERTICAL STAND OF WIDE-STRIP HOT-ROLLING MILL

  To reduce the slabs up to 150 mm in width and to form the workpiece edges a vertical roll stand fitted with the rolls with grooves and hydraulic screw-down mechanisms were developed and constructed at NKMZ.
  A special feature of the stand construction is also the unconventional arrangement of the work rolls drive with the hollow output shafts that gives a considerable gain in the stand height clearance as compared with the conventional drive.

  The high dimensional accuracy through cross and longitudinal sections of strips and plates, the optimal shape are obtained both in working stands and in the mill by means of the modern facilities and automatic control systems developed by NKMZ in close cooperation with leading scientific and research institutes of the Ukraine and Russia using modern technologies and automated control system.

Among these are a hydraulic screwdown mechanism, counter-bending and auxiliary bending systems, systems for axial shift and thermal cambering of work rolls, crossing of work and backup rolls, a "water curtain" type laminar cooling system on the run-out roller table with appropriate systems for controlling process variables.   We manufacturehydraulic screwdown mechanisms (HSM) (HSM) for the automatic gauge control system of strip width. The setting speed is 4 mm/s, the stroke is 30-160 mm, the setting accuracy is 0.01 mm.   The main functions of HSM: stand protection against overloads; assurance of roll assembly wedging for quick removal of metal in emergency situations; adjusting of longitudinal gage interference, non-flatness and camber of breakdowns; assurance of breakdown required accuracy through thickness.

HSM technical data

In addition to the hydraulic bending of work rolls and in conjunction with it to influence the strip shape more efficiently we suggest a thermal cambering system, which contains quick-acting shut-off valves providing a prompt control of cooling nozzles and a discrete influence on the work roll profile.

The work roll shift system provides a high quality of the strip surface, a possibility to perform a program-free rolling, reduces the number of roll changes.
  The crossing, counter-bending and auxiliary bending systems influence greatly a strip cross section.

  Shift range: ±10% of roll barrel lenght.
  Crossing range ±1%.

SPINDLE ARRANGEMENT FOR ROLLING MILLS

Basic types:

• universal;
• gear-type;
• universal-jointed;
• roller-type.

NKMZ spindle arrangements are characterized by:

• high load-carrying capacity and durability;
• true balance in ail spindle positions;
• automatic fixing on roll changing;
• no-clearance joining with the roll drive end;
• centralized lubrication of hinges;
• convenient in maintenance and repair;
• low dynamic loads in stand drive line.

  The convenience in using our rolling mills is also obtained by means of mechanization of auxiliary production operations such as changing of work and backup rolls, banding and marking of coils, sampling, assembly and disassembly of bearings for rolls. The roll-changing device provides:

• automatic change of work and backup rolls in finishing and roughing stands of plate mills;
• possibility to be located in straitened servicing zones where it is impossible to use conventional designs;
• transportation of rolls to a roll-turning shop without cranes.

  The hydraulic descaler for the secondary scale removal is set before the finishing mill group. Unlike conventional designs in the descaler there is made a provision for the mechanized whetting out of the headers which allows to take care of sprays and change the headers as complete units in the process of mill operation.
  The descalers provide:

• Slab and semi finished rolled stock descaling of primary and secondary scale of breakdown top and bottom surfaces.
• Automatic keeping of distance between semi finished rolled stock and top collector.
• Automatic supply of high-pressure water to the collector.
• Constant angle of burners inclination towards the cleaned surface.
• Collectors and burners damage protection.
• Guaranteed covering of water flow spray on the surface.

  A banding machine for the automatic banding of hot-and cold-rolled coils with a metal band locked with a clamp made directly in a fastening head.
  NKMZ offers a delivery of complete equipment for hot and cold rolling departments in short time, of high quality and using modern manufacturing processes.
  Our specialists will do their best to meet your specific requirements for increase in the output, improvement in the quality, more rational and economical manufacture, they will create technologies and equipment for optimal manufacturing processes.
  The utilization of computer systems for the calculation and optimization of the machines and plants, the use of the efficient electronic facilities for taking measurements, controlling, adjusting and automating the manufacture assure the advantageous solution of any raised problem.
Our conception on creating rolling mills for you is:

• economical efficiency;
• quality;
• profitability;
• promising future.

Cooperation with us is the best solution of your problems.