Solid measuring rolls for every application

The Stressometer measuring roll family

The Stressometer family of solid flatness measuring rolls for cold rolling mills has three members. Together these rolls cover all needs of flatness measurement regardless of the application and metal type being rolled.

Choose your roll

Standard roll
The well-proven standard roll uses 26 or 52 mm wide transducers for measuring flatness. The transducers are protected by shrink-on rings. Roll diameter, ring material, surface material and surface hardness are adapted to demands of each specific application.
Seamless roll
The seamless roll is used where quality of the strip surface is of particular importance. The roll has a completely seamless surface – there is nothing that can mark the strip.
Foil roll
The foil roll has a Pressductor transducer with a somewhat different design compared to the standard transducer.
While sharing long-term stability e.g. no sensitivity drift and other important Pressductor characteristics with the standard transducer, the foil transducer has a better signal to noise ratio.

Roll data

Features Standard roll Seamless roll Foil roll
Roll life cycle More than 20 years  More than 20 years  More than 20 years 
Strip thickness range 0.1 to 10 mm or
0.02 to 2 mm 1)		 0.1 to 10 mm or
0.02 to 2 mm 1)		 0.005 to 0.5 mm
Typical accuracy
(installation dependent)		 0.5 I-units
 0.5 I-units
 0.5 I-units
Parallel resolution 2)
 26 and/or 52 mm
 26 and/or 52 mm
 52 mm
Measurement zone width  26 and/or 52 mm
 26 and/or 52 mm
 52 mm
Minimum edge zone coverage for measurement
 1 mm
 1 mm
 1 mm
Measurement range, tension/zone 10 to 60000 N
5 to 10000 N 1)		 10 to 60000 N
5 to 10000 N 1)		 1 to 1000 N 
Maximum mechanical load,
without need for recalibration of the roll		 120000 N
 2000 N 1)		 120000 N
 2000 N 1)		 2000 N
Dynamically measurable
force change per zone		 0.7 to 1 N 3)
0.3 to 0.5 N 1) 		 0.7 to 1 N 3) 0.02 to 0.03 N 3)
Maximum measurement density
(number of measurement points/meter strip)		  320 4)  320 4)  290 4)
Maximum strip temperature 240°C 5) 240°C 5) 180°C 5)
Minimum wrap angle 4 degrees 4 degrees 10 degrees 
Roll diameter  313, 400 mm 313, 400 mm 200, 303 mm
Coatings       
 Hardens steel ●   ●
High speed steel  ●    
 Seamless roll coating   ●  

1) Semi foil design.
2) Resolution with max. 2 x 12.5% force spreading to adjacent measurement zones.
3) Wrap angle dependent.
4) 4 measurement points per zone and roll revolution.
5) Without airknives or other cooling systems. Several installations in aluminium hot rolling mills have been made.

ABB has developed a series of different types of roll surfaces meeting most requirements

Type of roll surface Surface hardness (±2 HRC) Surface life cycle Regrinding
 Hardens steel 54 HRC >20 years after 2 - 3 years 6)
High speed steel (HSS) 60 HRC >25 years after 3 - 5 years 6)
 Seamless roll coating 66 - 70 HRC 7) >5 years recoating and grinding after 5 - 10 years

6) Depending on application.
7) Depending on material composition in coating layers.
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