From STEEL GRIPS online
Xuanhua, China, orders 3-roll reducing and sizing block
Aug 3, 2010
Xuanhua Iron & Steel, a division of the state-owned Hebei Iron & Steel Group, placed an order for the supply of a 3-roll reducing and sizing block.
The block is designated for the small bar mill, one of Xuanhua's five new rolling mills currently under construction. The 3-roll block will be implemented in this new rolling mill behind the 2-high roughing and intermediate mill, which will consist of 18 HV stands.
The scope of supply includes the 3-roll reducing and sizing block with automatic quick stand changing system, pass and guide remotely controlled adjustment as well as the roll shop equipment with quick roll change and a computer aided system for accurate adjustment of rolls and roller guides of 3-roll stands. Besides the supervision of erection and commissioning Kocks will, for the first time, also be responsible for the process and the equipment of thermo-mechanical rolling, which is part of the scope of supply as well.
The block in "heavy duty" design is dimensioned for the operation with four 3-roll stands and a nominal roll diameter of 370 mm. It is designed to produce straight bars within a range of 14 mm to 90 mm at a rolling speed of 18 m/s.
The new 3-roll block allows rolling out of one pass series in the roughing and intermediate mill and thus significantly reduces the number of the required pre-sections. Any desired finished dimension of the complete dimensional range can be produced in any desired sequence with a minimum number of roll sets and just a few stand changes only. The optimum adjustment values for motor speed, rolls and guides as well as gear steps are calculated by a bar mill configuration system depending on the final product.
Commissioning of the new 3-roll reducing and sizing block is scheduled for the end of 2011.
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