Minimum Quantity Lubrication
Flexible Roll-Gap Lubrication
Minimum Quantity Lubrication® (MQL) represents a new generation of roll-gap lubrication that applies pure rolling oil, very finely dispersed with air, directly onto the work-roll surface. The development consists of a novel design of the spray nozzles for lowest oil/air flow rates. The advantage is intelligent control of the oil film thickness depending on actual process and product parameters. MQL overcomes the existing limitations of classical emulsion technology in terms of flexibility by allowing for rapid lubrication changes to fulfil a range of different lubrication requirements.
MQL was successfully installed and tested on two different industrial tandem cold rolling mills in Europe. On both mills a significant improvement of strip surface cleanliness could be shown by an increase of surface reflexivity of 10%-points on average (Scotch-tape test). Furthermore, energy consumption could be reduced by up to 10% and rolling forces by up to 20% per stand.
MQL represents a technology package which can be simply installed on mills either as additional lubrication technology or to substitute the existing roll-gap lubrication. This allows a product dependent lubrication which fully exploits and extends the cold rolling mill capability.
The robust design of the MQL spray bar ensures low maintenance effortsMain benefits
- Significantly improved strip surface cleanliness
- Reduced energy consumption (lower OPEX)
- Increased work-roll lifetime
Elimination of Third-octave Gauge Chatter on Tandem Cold Rolling Mills
Rolling mills are prone to many different vibration phenomena, especially when operating at high speeds and when rolling high-strength steels and thin product gauges. The most destructive form is called third-octave gauge chatter, a type of self-excited vibration.
A unique solution, ChatterBlock® Control, fully eliminates third-octave gauge chatter, as proven on a 5-stand tandem cold-rolling mill. With ChatterBlock® Control, chatter-critical products can be rolled at a maximum pass-schedule speed without any quality degradation.
As the leading supplier of vibration consultancy services and solutions, Primetals Technologies has developed ChatterBlock®Control, a unique solution for active chatter damping. ChatterBlock® Control represents an autonomous technology package that can be easily adapted to a mill to free it from unwanted third-octave chatter and thereby increase productivity and raise product quality.
The ChatterBlock® Control valve block attached to the roll force cylinder
- Complete elimination of third-octave gauge chatter
- Proven on a 5-stand tandem cold-rolling mill
- Increased productivity
- Improved product quality