.gif?width=220&height=220&mediaprotectionhash=27a2c7b682a980edd98804d5ef3ab0afa2e746bbcbde7192e62ce4a3fe797500&ext=.gif)
Siemens to Supply Skinpass Mill for Jisco
04/29/2007 - Jiuquan Iron & Steel Group recently placed an order with the Siemens Industrial Solutions and Services Group to supply a new four-high skinpass mill that incorporates an uncoiler with automatic coil positioning and centering and an automatic elongation control system.
Jiuquan Iron & Steel Group Co., Ltd. (Jisco), P.R. China, recently placed an order with the Siemens Industrial Solutions and Services (I&S) Group to supply a new four-high skin-pass mill. The order is worth around eleven million U.S. dollars.
Jisco is building a new cold-rolling mill at the Jiayuguan location as part of its goal to expand its range of products. Siemens is responsible for planning the skinpass mill, and will supply key components of the mechanical equipment as well as all of the electrical, automation and processing systems. The new four-high skinpass mill will enable the facility to produce steel grades including CQ, DQ, DDQ, HSLA and EDDQ. Jisco will process strips up to 1680 mm wide in coils up to 31 tonnes on the new skinpass mill.
Jisco is building a new cold-rolling mill at the Jiayuguan location as part of its goal to expand its range of products. Siemens is responsible for planning the skinpass mill, and will supply key components of the mechanical equipment as well as all of the electrical, automation and processing systems. The new four-high skinpass mill will enable the facility to produce steel grades including CQ, DQ, DDQ, HSLA and EDDQ. Jisco will process strips up to 1680 mm wide in coils up to 31 tonnes on the new skinpass mill.
The uncoiler in front of the skinpass mill features an automatic coil-positioning and centering function which speeds up strip processing. The automatic elongation control system ensures uniform elongation and creation of the specified strip texture. Separately driven work rolls enable precise setting of the strip surface roughness and also suppresses the yield-point elongation. Cylindrical roll bearings with separate axial bearings for the reserve rolls will help to ensure low roll eccentricity, and pivoted work-roll-change carriages will enable fast and automatic changing of the work rolls. In addition, the work roll bearings are fitted with tapered roller bearings to help facilitate maintenance.
A wet-skin-pass system with zone cooling will optimize the strip’s surface finish and increase the useful life of the work rolls. Wedge displacement will continuously compensate for the abrasion of work and back-up rolls, which enables a constant pass line without shimming plates. Servo-hydraulically controlled positive and negative work-roll bending will help to minimize flatness defects. There is also the possibility of integrating a closed-loop flatness-control system with a shape roll.
Siemens is responsible for the installation of all components and commissioning of the skinpass mill as well as for supervision of manufacturing. The new skinpass mill is scheduled to start operating in June 2009.
A wet-skin-pass system with zone cooling will optimize the strip’s surface finish and increase the useful life of the work rolls. Wedge displacement will continuously compensate for the abrasion of work and back-up rolls, which enables a constant pass line without shimming plates. Servo-hydraulically controlled positive and negative work-roll bending will help to minimize flatness defects. There is also the possibility of integrating a closed-loop flatness-control system with a shape roll.
Siemens is responsible for the installation of all components and commissioning of the skinpass mill as well as for supervision of manufacturing. The new skinpass mill is scheduled to start operating in June 2009.
Jiuquan Iron & Steel Group (Jisco), located in Jiayuguan, was established in 1958 and has three production facilities in the Jiayuguan/Gansu Province, Hongyang/Shangxi Province, and Yuzhong-near Lanchow/Gansu Province. The company has an annual production capacity of 2.2 million tonnes of hot metal and the same amount of crude steel, as well as 2.6 million metric tonnes of rolled steel.
