Oil - Lubrication

 

 
A personal consultation cannot replace this overview, please contact us!
We, Mohr Zentralschmierung, would like to give you an overview of the variety of products.
The market for oil systems with its many components is almost inexhaustible.
 

Single line system with piston distributors

The standard system for solving the most varied lubrication tasks in operation with lubricating oils is the single line system with piston distributors.

These standard systems are excellently suited for relatively small oil quantities per lubrication point, adjusted to the consumption, with intermittent oil supply.

Standard systems always have the same basic design:

  • 1. pump
  • 2. main pipeline
  • 3. piston distributor
  • 4. lubrication point lines
  • 5. lubrication point
for automatically and self-sufficiently operated plants:
  • 6. control and monitoring bodies are added

As required:

  • 7. pressure switch
  • 8. level switch
  • 9. warning and control lights

Oil conveyors are manually, mechanically, hydraulically or pneumatically operated piston pumps or intermittently electrically operated gear pumps.

The lubricant is metered by piston distributors mounted in the pipeline network. By means of exchangeable metering nipples on the distributors it is possible to supply the required quantity of lubricant to each lubrication point per stroke or working cycle of the pump. The dosing range extends from 0.01 to 1.5 cm³ per lubrication pulse and lubrication point. The quantity of lubricant to be supplied to the lubrication points can also be influenced by the number of lubrication pulses. In the case of consumption lubrication systems, an oil return from the lubrication point to the oil reservoir is usually not provided for. In this case these are referred to as consumption lubrication systems.
 

Minimum quantity lubrication (MQL)

The minimum quantity lubrication is used for cutting and non-cutting shaping. In the field of metal-cutting shaping, minimum quantity lubrication can often replace the flood cooling lubrication which has been common in the metalworking industry up to now. In non-cutting shaping, systems are already used in many cases where only small quantities of lubricant are used.

The complete renunciation of lubricant, i.e. dry machining, would be the goal to be striven for. However, this is only possible in special cases, so that a minimum amount of lubricant is required for most machining processes.

The term "minimum quantity lubrication" is used to distinguish between:

  • Internal minimum lubrication function: An aerosol is generated in the container of the MQL devices and transported to the tool by the rotating spindle or the turret of the machine tool. The dosed amount of oil is consumed without residue if the setting is optimal.
  • External minimum lubrication function: Dosed lubricant is atomized in a spray nozzle by compressed air. This creates micro-droplets, which reach the friction point with the carrier air without mist formation.

Task:

A minimum quantity lubrication system has the task of supplying the smallest quantities of a lubricant to the effective area between tool and workpiece during metal cutting or non-cutting forming. A further important goal is that the workpiece, chips and tools remain practically dry.

A few applications are shown here:

Minimal quantity lubrication is used in metal-cutting and non-cutting forming.
In metal-cutting shaping, the MQL can often replace the flood cooling lubrication that has been common in the metalworking industry up to now.
In non-cutting shaping, systems are already used in many cases where only small quantities of lubricant are used.
With minimum quantity lubrication, the lubricant consumption per tool is approx. 10 to 50 ml per process hour. With flood cooling lubrication, the quantity ranges from a few l/min up to 100 l/min. The coolant volume for transfer lines is 50 to 70 m³/day and approx. 6 m³ coolant is discharged with the chips produced.

Advantages and disadvantages of minimum lubrication:

Advantages:

- Very low lubricant consumption with low lubricant costs
- Relatively low expenditure on equipment
- No cleaning of the chips necessary
- Chip recycling possible without subsequent treatment

Disadvantages:

- Device technology still capable of development
- Machine technology must be reconsidered
- Tools must be adapted to the MMS system
- Hardly any heat dissipation
- Compressed air consumption