DMS 20Hi cold rolling mills

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DMS 20 Hi cold rolling mills

The cold rolling mills are essential to reduce strip thickness while guaranteeing strip surface quality. With more than 100 references worldwide over last 60 years, Fives’ range of DMS 20Hi cold rolling mills (CRM) is proven for applications in stainless and silicon steels, as well as for nonferrous materials.

New generation DMS 20Hi CRM advanced improvements:

  • Strip productivity is up to 10% higher, thanks to the advanced strip wiping and strip cooling technologies
  • Strip surface quality is enhanced thanks to the improved flatness control and lubrication of roll bite
  • Availability and safety benefit from the significantly decreased fire risk, as well as the reduction of strip breakage occurrence
  • The 3rd generation of the wiping system - DMS Wiper SCP 3.0 is available

Watch the video: the first DMS 20Hi EcoMill successfully commissioned at Shanghai STAL

DMS 20Hi cold rolling mills for stainless and silicon steels

The DMS 20Hi rolling mill for stainless steel achieves a maximum rolling speed of 1200 mpm, a minimum strip thickness of 0.04 mm and a maximum strip width of 1880 mm.

The DMS 20Hi rolling mill for silicon steel is designed to process electrical steel with specific magnetic properties, resulting in low power loss per cycle, low core loss, and high permeability that is extremely sensitive to produce.

Advanced strip cooling and flatness control system

New cooling ramp design and control ensure symmetric flow, higher productivity (better cooling), better strip surface quality and flatness, and better flow control (left/right & top/bottom). The optional variable speed pumps offer savings of 1100 MWh/year.

By exclusively implementing push-push 1st IMR (InterMediate Roll) shifting system, Fives has also significantly reduced the risk of broken parts or fire and thus decreased maintenance and improved safety. The latest improvements also include easy work roll change and reliable first IMR change.

Simple maintenance and operation

Simplicity and safety go hand in hand in the latest improvements to the DMS 20Hi CRM. Mill hoods can be easily dismounted and there is overhead crane access to mill back side equipment and the mill spindle. Easy access is also ensured to both the paper winders and all valve stands. Roll gap lubrication has also been improved to eliminate oil splash and the need for hose dismounting. There is also an advanced housing machining tool, specific to DMS 20Hi cold rolling mills, which allows to efficiently machine the mill housing with the very stringent tolerances required by quality purposes. 

Mill fume exhaust

The patented improved design of the mill fume exhaust includes new hoods/duct design and a full finite element calculation (FEA) of the fume exhaust. Fume exhaust flow is reduced by 35% and the unexhausted fume volume has been cut by two-thirds. With an optional variable speed fan, savings of 650 MWh can be achieved. 

Mandrel greasing

Fives has improved mandrel greasing substantially by making it a fully automatic rather than manual process. This saves greasing time of 15 minutes per mandrel per day and increases cold rolling mill productivity by 2~3%. Other advantages include the reduction of grease consumption and the increase of mandrel shaft lifetime.

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