Sundwig 20-high cold rolling mill

The history of the Sundwig 20-high rolling mill begins in the first half of the last century, when Sundwig (now ANDRITZ Metals Germany) developed a multi-roll cold rolling mill in 1930. Just a few years later, the first alligator-type 20-high rolling mill was built, followed in 1958 by the first 20-high rolling mill in Sundwig Four Column (SFC) design. Since then, ANDRITZ Metals Germany has continued to develop 20-high rolling mill technology consistently and ranks among the leading manufacturers in this field.

Today, ANDRITZ Metals Germany has numerous own patents for this technology and design, underlining the company’s focus on customer-oriented solutions. The axial shifting system (push-push), the impingement jet cooling system, and the rectangular back-up saddle design, for instance, offer distinct economic advantages.

The rolling mill stand houses all of the state-of-the-art flatness adjustment elements, like tilting, bending and axial shifting. The high-impact strip drying system ensures a safe rolling process up to the maximum rolling speed.

The fully automatic roll change by robot has substantially shortened rolling mill set-up times and, even more importantly, permits contact-free roll changing within a very short time without damaging the rolls.

Outside the stand, the entire rolling technology is based on Sundwig’s experience, like the advanced safety concepts, modern fume exhaust system, rolling oil filtration, and the hydraulic equipment.

ANDRITZ Metals Germany’s many years of experience with AGC and shape control as well as the advanced mathematical process model and process optimization system secure highest product quality and operating reliability.

References

With more than 135 references for 20-high cold rolling mills, Sundwig is one of the most notable suppliers in this rolling mill technology segment.

• SFC – Sundwig Four Column

Strengths and benefits

• Large roll grinding ranges without the need to change the intermediate rolls.
• Simple back-up axle design with rectangular support saddles for easiest maintenance
• Impact jet cooling system
• Simple pass line adjustment (wedge)
• Fully automatic roll change device
• Pre-commissioning at ANDRITZ Sundwig workshops

Corresponding E&A models

• Strip thickness control
• Strip flatness control
• Roll force model (Ford, Ellis, Bland, Hitchcock)
• Strip temperature model
• Strip flatness model
• Pass scheduling program
• Long-term pass schedule and mill pre-set optimization program

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