10/1/11 UniWest introduces Proceq’s Cold Rolling of Aluminum Products

"We have been using Equotip for many years, predominantly in the area of roll grinding. Particularly, we appreciate its portability and easy handling. Equotip has delivered a very good performance in the daily on-site inspection.”


Cold rolling is a metal working process in which metal is deformed by passing it through rollers at a temperature below its recrystallization temperature. It is a method often used to decrease the thickness of plate and sheet metal. As the accumulated tonnage of rolled material increases, the hardness of the roll in- creases above its original manufacturer certified roll hardness due to work hardened material. This has to be removed by grinding to bring the roll hardness back to its original value. Failure to do so will eventually lead to phenomena such as "spalls" which tend to significantly reduce the overall roll life. Back-up rolls suffer an ever faster reduction of their roll life due to spalling.


Hydro Aluminium Deutschland GmbH
Hydro's foil, strip, liquid packaging and aseptic packaging products are typically used in the following industries: automobile, transport, building, engineering, electrical, printing and packaging.


Employees: 22,000 in over 30 countries


• Accurate hardness profile measurements across very hard steel rolls (up to 1000 HV) to improve quality levels of roll suppliers and demonstrate best-in-class professionalism to Hydro's customers.
• Increased testing frequency
• Verification of functionality and accuracy


Proceq Product: Equotip 3 with type D and E impact devices


Benefits to the Customer
• Versatility; accessibility of impact devices, ability to measure very hard materials
• Accurate management of full roll life (cost savings)
• Reliability; years of testing without defects


Hydro Aluminium uses Equotip for incoming goods inspection of steel rolls. A typical roll diameter is 400 mm. The roll hardness is measured in two ranges, i.e. 780 HLD (~ 650 HV) and 850 HLE (~ 950 HV) and at intervals of 100mm. For a higher hardness range, the impact device E is preferred to the D device due to the higher robustness of its ball indenter. The rolls hold relatively high chromium content which is important to know when converting dif- ferent hardness scales i.e. comparing Equotip and Vickers measurements.

Equotip is a standard for roll testing and the Leeb hardness unit (HL) has been well-known in the industry for many years.


Metal Hardness Testing
Cold Rolling of Aluminium Products: Failure to maintain a constant roll hardness will shorten the roll life.

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