Minimum Quantity Lubrication Technology

When using Minimum Quantity Lubrication Technology (MQL) the lubricant is transported to the cutting edge in the form of an aerosol. In contrast to the conventional cutting fluid (coolant) only the smallest amount of a lubricant are used for chip extraction. The greatest part of the thermal energy is extracted with the chip by the airflow and the high feed rates.

Dynamic aerosol generation and monitoring functions within the MQL systems enable the highest process reliability.

 

Comparison of the processes

Coolant

MQL
Lower acquisition costs machine tool      
Lower acquisition costs lubrication technology      
     
Longer tool life      
Higher cutting speeds      
More homogenous temperature on the blade      
Shorter processing times      
Better surface quality      
     
Consumption lubricant high low

Chip

wet dry
Work piece after processing wet dry
Filtering coolant necessary not necessary
Disposal cooling lubricant necessary not necessary
Cleaning chip necessary not necessary

Types of processing:

  • Milling
  • Lathing
  • Thread cutting
  • Types of thread
  • Drilling
  • Deep hole drilling
  • Reaming
  • Roller burnishing ...

That clear...?

Sure! The biggest challenge when using MQL applications consists of generating and delivering a perfect aerosol. Many manufacturers have not fulfilled this demand. We at LUBRIX are masters of the perfect aerosol. The most homogenous particle sizes between 0.1 and 1 µm, exactly parameterised and monitored.

1 Channel

Until the 90s, lubricating oil and air were delivered through the spindle in separate channels. Both media were mixed in the tool holder.

Today, LUBRIX systems generate a lubricating aerosol in modern MQL systems and deliver the conditioned MQL medium to the cutting edge in a controlled way. For the user, there are only advantages:

  • More homogenous delivery of oil
  • Lower oil consumption
  • Simpler installation
  • Faster reaction time
  • No throttle effect in the tool holder
  • Leakages in feed lines have a less negative influence
intern-extern1

Internal feed

External feed

Optimum cooling

Shadow effect

External feed

A nozzle sprays the aerosol on to the tool blade from outside. For tools without cooling channels only the external feed can be applied.

 

Internal feed

The aerosol is directed through the tool and therefore immediately applied at the place of machining. Consequently, with minimum oil consumption ideal lubrication can take place.

As far as possible, lubrication should always be fed "internally" in order to avoid shadow effects and wastage.

A further advantage of the internal feed is the fact that exit angles of nozzles do not have to be set manually.