Siemens VAI welders – the optimum solution for every situation

Siemens VAI supplies a range of welders to handle the tough requirements of coupled pickling tandem mills and continuous tandem cold mills: mash lap welders for efficient strip joining, flash butt welders for superb reliability in demanding welding tasks, and laser welders for top quality with minimum maintenance.

• Welders for cold rolling plants

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Siemens VAI offers efficient and modern solutions for pickling sections coupled to tandem cold mills.

By converting a batch-type tandem cold-rolling mill into a continuous tandem cold mill while linking the pickling and cold-rolling processes, producers can improve production rates, product quality, dimensions and yield, facilitate easier operation and maintenance, achieve energy savings and, most importantly, lower overall costs. Production capacity can be increased from approximately 700,000 to 1.2 million t/a by upgrading to continuous operation. By linking the pickling and cold-rolling processes, typical production capacities can be further increased to 2.0 million t/a.

• Upgrading to continuous TCMs, Linking of pickling and cold rolling

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The Siemens VAI flatness quality package offers solutions to add, replace or enhance shape control systems in all kinds of cold rolling mills.

Siemens VAI quality improvement packages are suitable both for incremental improvements and major modernization processes.  Depending on the mill type the mill stands are equipped with roll bending or shifting systems, SIROLL SmartCrown roll contour or multizone cooling. The backbone of the flatness quality package is the patented SmartCrown roll contour, which can be applied to work and/or intermediate rolls. Benefits include significantly enhanced control range, replacement of all conventional roll contours with a single roll contour, control architecture that meets current and future requirements, more flexible pass schedule due to the large adjustment range of the SmartCrown rolls, and savings in roll inventory.

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The Siemens VAI roll-change system increases mill availability and eliminates roll damage, thereby ensuring a significant increase in production.

Many plant owners still change work rolls manually, which is rather time-consuming.By replacing this system with the Siemens VAI automatic roll-change system mill availability can be significantly increased. Our automatic roll-change system allows fully automatic work-roll change with or without strip in the mill. The roll change can be carried out for each mill stand individually or for all stands together. This system can be applied to new cold rolling mills as well as modernizations of existing mills. In the event of an upgrade the disturbance to production is kept to a minimum.

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Siemens VAI high-precision side trimmers and scrap choppers reduce production costs, increase throughput and improve strip edge quality.

The new generation of side trimmers and scrap choppers is characterized by compact design, easy installation, easy exchange of knives, double knife head, high availability, low maintenance costs and best performance for fast knife and strip width change. Siemens VAI supplies the dynamic width change (DWA) functionality, allowing the knives to be adjusted to precise degrees. This leads to higher productivity as the strip does not need to be stopped. Special high-precision spindle units are installed for GAP, LAP and width adjustment. This high-precision side trimmer ensures high accuracy of the strip width and top-grade automation movements by the servo-motor.

• SIROLL CM Side-Trimmer, Scrap Chopper

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SIROLL CM high efficient blow-off system to ensure removal of emulsion.

Remaining liquids on the strip impair surface quality during recoiling. A strip blow off system with a special air-nozzle arrangement can be installed to remove any residual emulsion. The nozzles act on the strip surface in a cascaded manner and directly form the interfaces between work roll and strip, work roll and back up roll, and between the intermediate and backup roll in 6-high stands. The liquid removed bay the air blast is captured in an exhaust system. The cleaning system guarantees efficient blow-off at all mill speeds, ensuring highest strip-surface quality after rolling.