MQL SHRINKFIT HOLDERS · 2020. 3. 9. · MQL tool holders: Seco’s offer EPB 5403M1 • Shrinkfit holders, , according to standard DIN 69090 -3, and equipped for MQL1 • Coolant

MQL SHRINKFIT HOLDERS

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2


What is MQL?

MQL: Minimum Quantity Lubrication

• Mix of air and oil

• Volume of coolant highly reduced

• MQL1 and MQL2 technologies

Main advantages

• overall coolant costs reduced

• keeps the machine environment and workpiece

clean

• reduces the need for recycling coolant floods

• makes the recycling of chips easier

• reduces the exposition of operators to chemicals

3

MQL

Conventional

coolant fluid

Vo

lum

e o

f co

ola

nt

What is MQL? MQL stands for “Minimum Quantity Lubrication”. This ‘near-dry” cooling solution consists in a mix of air and oil, generating an emulsion. It is an alternative to flood coolant systems. MQL coats the interface “cutting edge/workpiece” with a thin film of lubricant and prevents heat build up through friction reduction. Advantages of MQL This solution significantly reduces the volume of coolant used to lubricate machining operations: overall coolant costs reduced, keeps the machine environment and workpiece clean, reducing the need to clean workpieces, reduces the need for recycling coolant floods, as the volume used is very low compared to conventional flood coolants and as it is mostly consumed in the cutting process, makes the recycling of chips easier, as no cleaning is needed, reduces the exposition of operators to chemicals.


Requirements to implement MQL

4

MQL COOLANT

SUPPLY UNIT

Tool holder according

to standard

DIN 69090-3

Coolant tube

MQL

Stop end

screw MQL

Tool

designed for

MQL

Machine equiped for MQL

• MQL coolant supply unit

• Spindle designed for MQL

• Specific aspiration

Tool holder designed for MQL*

• Specific internal design

• Specific accessories

Tools designed for MQL

• specific coolant channels

• tapered tool shank designed according to

standard DIN 69090-3.

* Seco’s solution is designed according to DIN 69090-3; Other suppliers of

MQL solutions may use their own, patented solutions.

Requirements for MQL The whole chain, including air and oil volumes and cutting parameters, must be optimised to get efficient results with MQL. MQL needs a specific equipment to produce and deliver the emulsion: - machine equipped with a MQL unit, - suitable tool holders, equipped with specific coolant tubes and stop end screws. The standard DIN 69090-3 defines specific requirements for MQL standard holders. - tools with specific coolant channels, adapted to MQL.


MQL tool holders: Seco’s offer

EPB 5403M

• Shrinkfit holders (according to standard DIN 69090-3) and

ready for MQL1 and MQL2

• Coolant tubes and stop end screws to be ordered separatly

Suitable for:

• customers willing to run tests with different accessories to

optimise a MQL process

• Customers already equipped with MQL accessories

Code key

5

E9304 5403 0680 M Designed for MQL1

and MQL2



EPB 5403M1

• Shrinkfit holders, , according to standard DIN 69090-3, and

equipped for MQL1

• Coolant tube and stop end screw mounted when delivered

• Laser marking allowing identification of the MQL1 solution

– MQL marking in the HSK V-flange

– Product description « M1 »

Code key

6

E9304 5403 0680 M1 Equipped for MQL1 (one combinaison « tool

holder +MQL1

accessories » possible)



EPB 5403M2

• Shrinkfit holders, , according to standard DIN 69090-3, and

equipped for MQL2

• Coolant tube and stop end screw mounted when delivered

• Laser marking allowing identification of the MQL12

solution

– MQL marking in the HSK V-flange

– Product description « M2 »

Code key

7

E9304 5403 0680 M2-1.9

Equipped for MQL2 (several combinations

« tool holder +MQL2

accessories » possible)

External diameter

of the coolant

Tube*

*see explanations in slides “MQL2”

MQ

L1


MQL1: one channel

9

MQL1 COOLANT

SUPPLY

Oil and air mixture

externally

One channel

Oil + Air

Rotary

union Spindle

MQL Shrinkfit

holder

Stop end

screw

MQL1

Coolant tube

MQL1

Oil and air mixed before the machine spindle

Conveyed through one channel to the tool holder

MQL1: the ‘air and oil’ emulsion is produced before entering the spindle and delivered to the tool through one channel (hence MQL1) that goes through the spindle, the tool holder and the tool. HSK-A63: Conventional coolant tubes and MQL1 stop end screws are needed. HSK-A100: Specific MQL1 coolant tubes and MQL1 stop end screws are needed.


MQL1 coolant tube

10

HSK-A63

• conventional coolant tube

HSK-A100

• MQL1 coolant tube

• Internal coolant diameter optimised for

MQL

– Tapered from Ø12 to Ø8mm

Coolant tube HSK-A63, MQL1 Shrinkfit holders use a conventional coolant tube 20E9304: conventional Ø8 internal diameter is suitable for MQL solutions. HSK-A100, MQL1 Shrinkfit holders use a specific coolant tube 20E9306M1: the internal diameter is adapted to optimize the MQL flow (tapered from diameter 12 to diameter 8mm).


MQL1 stop end screw

11

Adapted to MQL tool shank: taper according to

standard DIN 690903-3

Short and long version, depending on the

length projection of the tool holder

Tapered contact surface

Short version

19MQL1xxS

Long version

19MQL1xxL

Stop end screw Stop end screw for MQL1 are adapted to MQL tool shank, according to DIN 69090-3. For each tool shank diameters, 2 stop end screws are available: short and long version The choice between the short and the long version depends on the gauge length of the tool holder. See correspondence tables in catalogue pages.


MQL1 accessories: code keys

12

MQL1 Coolant tube MQL1 Stop screw

Short version

19MQL1xxS

Long version

19MQL1xxL

2 stop screws available, for each tool shank diameters

The choice between the short and the long version

depends on the gauge length of the tool holder. See

correspondence tables in catalogue pages.

HSK-A63: MQL1 Shrinkfit holders use a conventional

coolant tube 20E9304

HSK-A100: specific coolant tube 20E9306M1

• the internal diameter adapted to optimize the MQL flow

(tapered from Ø12 to Ø8mm).

MQ

L2


MQL2: 2 channels

14

MQL2 COOLANT

SUPPLY

Oil and air supply through

2 independent channels

Oil Air

Rotary

union Spindle

MQL Shrinkfit

holder

Stop end

screw

MQL2

Coolant tube

MQL2

Mixing

chamber

Oil and air conveyed to the tool holder through 2 separate channels

Oil and air mixed in the mixing chamber of the MQL2 coolant tube

MQL2: the ‘air and oil’ emulsion is produced in the tool holder; The air and the oil are delivered through 2 distinct channels (hence MQL2) and are mixed in a chamber, in the MQL2 coolant tube. Specific MQL2 coolant tubes and MQL2 stop ends screw are needed.


Main difference between MQL1 and MQL 2 accessories

15

MQL2: Coolant pipe of the coolant tube

connecting to the stop end screw

Several coolant tubes and stop end screws

per tool shank diameter (see next slides)

MQL2

MQL1


MQL2 accessories

16

Variety of MQL2 coolant tubes

• For each tool shank diameter

• Different coolant channels diameters

– Depending on the coolant channels of the

tool (see next slides)

• Different pipe lengths

– Depending on the tool projection

Variety of MQL2 stop end screws

• Selected in step with the MQL2 coolant

tube above

Refer to catalogue pages for details

Coolant tubes

MQL2

Stop end screws

MQL2

A variety of MQL2 coolant tubes is available, with different coolant channels diameters and different pipe lengths


MQL2 accessories: code keys

17

20E9304 M2A 01

E9304=HSK-A63

E9306=HSK-A100

Code corresponding to the length

of the pipe

1=short

16=longest

For MQL2

Code corresponding to the internal

diameter of the pipe

A=smallest diameter

D=widest diameter

19MQL2A01

Code corresponding to the tool

shank diameter

1=smallest shank diameter

2=second smallest shank diameter

…

9=widest shank diameter

For MQL2

Code corresponding to the internal

diameter of the pipe

A=Ø2mm C=Ø4.1mm

B=Ø2.9mm D=Ø5.4mm

D=widest diameter

MQL2 Coolant tube MQL2 Stop screw


MQL2 accessories: selection

Selection based on the coolant

channels of the tools

Cross-sectional ratio of 1 to 4

1x Atool ≤ ADIF1 ≤ 4x Atool

Several combinations: priviledge

ratio closest to 1

Refer to the product pages in the

catalogue for easier selection of

the tools

18

Basic principle The selection of the appropriate MQL2 coolant tube and stop end screw is based on the tool that is mounted on the toolholder, and precisely on the dimension and number of coolant channels in the tool. Step 1: Selection of the appropriate MQL2 coolant tube To guaranty an optimal MQL flow delivery to the cutting edge, a cross-sectional ratio of 1:1 to 4:1 between the section of the tool coolant channels (Atool) and the section of the coolant tube’s pipe (Atube) is required. Atool ≤ Atube ≤ 4 x Atool If several combinations are possible, it is recommended to privilege the combination with the ratio the closest to 1, to optimize the MQL flow.


MQL1 vs. MQL2

19

MQL 1 MQL 2

Possible to change from a conventional coolant system to a

MQL1 system.

Does not allow to switch from a conventional coolant system to

a MQL2 system.

Can be implemented on multi-spindle machines. Very complicated to implement on multi-spindle machines.

The rotational speed influences the quality of the flow (the

flow must be adapted to the speed).

The rotational speed does not influence the quality of the flow

(same flow quality, dependless of the speed).

Modification of the coolant parameters (quantity of coolant,

ratio oil/air…) is very slow. Not convenient when quick tool

changes are necessary.

Fast adaptation to parameter changes. Suitable when quick tool

changes are needed.

Limited volumes/min of coolant can be delivered to the tool

(150ml/min).

Higher volumes/min can be delivered to the tool (400ml/min).

Pressure 5 bars minimum required. Pressure 4 bars minimum required.

MQL SHRINKFIT HOLDERS · 2020. 3. 9. · MQL tool holders: Seco’s offer EPB 5403M1 • Shrinkfit holders, , according to standard DIN 69090 -3, and equipped for MQL1 • Coolant

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