THE BRONX GROUP

Coil Processing Solutions for Steel and Aluminium

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Tension Levelling Lines

Tension Levelling Lines from Bronx International

Bronx has a long and successful history of designing and building tension level lines and upgrades for both ferrous and non-ferrous metals. Equipment has been installed in the United Kingdom, Switzerland, Norway, South Africa, Canada, Spain, Korea, Taiwan, Poland, Indonesia, India, Bangladesh and China. Tension levelling corrects poor shape imparted in metal strip by cold and hot rolling processes. Table top flatness quality can usually be produced depending on the severity of the poor shape of the incoming strip. Bronx Tension Levellers are well known for producing the very best flatness in high quality surface sensitive products.

Tension levelling will also greatly improve the physical properties of low carbon steel and other metals susceptible to the appearance of a defined yield point. without corrections, these types of steel can form unsightly ‘luder lines’ which when severely cold worked, usually causes reject components.

Lines are built with speeds of up to 300 MPM, thickness from 0.15mm to 3mm, widths to 1750mm in both 4 and 6 high configurations.

Quick change roll cassettes are standard for both top and bottom roll clusters. Usually, two work rolls and two decurving sections are supplied and in some instances, one decurving roll section is used to reduce capital cost.

Bronx engineers have developed computer programs to ensure optimum design to level Full Hard Steel, Annealed Steel, Stainless Steel and Aluminium.

Drive Arrangements

After extensive design evaluation Bron Engineers have standardised all electric drives for the regenerating and motoring bridles. this format produces outstanding operational results and has a number of key advantages over other types of drives.

  1. ease and flexibility of operation. changing the strip elongation on the leveller is as easy as changing the position of ones rheostat. this feature is vitally important in continuous galvanizing and paint lines where physical properties of the metal varies from coil to coil and line stoppages produce large amounts of costly scrap product.
  2. Maintenance of all equipment is lower, particularly when AC drives are used to power the bridles.
  3. Accurate matching of bridle roll diameters is required at all times in a mechanical drive. this is not required with electrical drives.

Tension level lines can be supplied as stand-alone lines or in conjunction with:

  • Coil Build Up Lines
  • Coil Inspection Lines
  • Slitting Lines
  • Side Trimmers
  • Degreasing
  • Oiling
  • Embossing
  • Continuous Galvanizing Lines
  • Continuous Paint Coating Lines

All Bronx Tension Levellers are pre-tested in-house, which saves valuable commissioning time.

Material

 

Steel – Full Hard (To 0.5mm)

Steel – Annealed

Aluminium

Stainless Steel

Material thickness – 0.15 – 3.0mm

Material width – up to 1830mm

Line speeds – up to 300 mpm

Materials processed include:

  • Paint and metallic coated steel and aluminium
  • Decorative and construction aluminium alloys
  • Automotive steel for both internal applications and exposed skin panels
  • Architectural and decorative stainless steel
  • Pre and post pickled Hot rolled steel

Applications

They can be found in continuous process lines, inspection lines and in dedicated tension levelling lines.

Technology

Bronx are at the forefront of technology for tension levelling and our machines include features such as:

  • 6 Hi or 4 Hi work roll cassettes
  • Multi station curvature correction for line bow and crossbow
  • Quick cassette changeover
  • Auto pre-set system
  • On-line flatness measurementBronx tension levellers are designed for best quality and long life.

We use tried and tested work roll cassette components of the highest quality together with proven preventative management programmes to ensure each of our users can maintain the highest quality and performance from our machines.

Bridle Drive and Elongation Control Systems

An important part of the tension levelling system is the bridle drive and elongation control system which utilises entry and exit bridles to generate the tension required to achieve the necessary strip elongation through the tension leveller.

Bridle drive system:

  • Independent electric drive

Our team of specialist design engineers will select the optimum drive system for each application.

Research and Development

Bronx continue to research and develop new analytical techniques in tension levelling to improve our knowledge of the tension levelling process.

Recent developments include:

  • Numerical analysis of strip-roll conformity in tension levellers
  • Improved predictive model
  • Pre-set system for operators
  • Flexible 2 axis work roll settings
  • Allowance for speed effect
  • Allowance for possible change in mechanical properties
  • Minimum energy settings

 

Bronx Precision Levellers

Bronx also make a range of Precision Levellers. Bronx have been building Precision Levellers for over 45 years and have over 500 in operation worldwide. the Bronx range of Precision levellers are designed to give the optimal flatness improvement to a wide range of material. They are available in different sizes and roll combinations and are selected by our experienced technical team to suit each type and range of materials to be processed.

Please contact our sales team for more information and for copies of published papers.

Download the Bronx International Tension Levelling Lines Brochure (pdf)

Contact The Bronx Group