WO2017016650A1

WO2017016650A1 - Cooling device for cooling a shrink-fit chuck

Info

Publication number: WO2017016650A1
Application number: PCT/EP2016/001249
Authority: WO
Inventors: Klaus Schüssler
Original assignee: KARL SCHÜSSLER GmbH & Co. KG
Priority date: 2015-07-24
Filing date: 2016-07-15
Publication date: 2017-02-02
Also published as: DE102015009611B3

Abstract

The invention relates to a cooling device for cooling a shrink-fit chuck for accommodating a tool or a workpiece, having an annular cooling adapter for establishing contact with the outer contour of the shrink-fit chuck and dissipating heat from the shrink-fit chuck by thermal conduction. The invention makes provision for the cooling adapter to have a plurality of separate contact elements (18, 19) which are made of a thermally conductive material, are distributed over the circumference of the cooling adapter and, during operation, are in contact with the outer contour of the shrink-fit chuck in order for the heat to be dissipated by thermal conduction from the shrink-fit chuck to the contact elements (18, 19). The invention also makes provision for the individual contact elements (18, 19) each to be displaceable in the radial direction and to be pivotable in the radial plane, so as to be adapted to the external diameter and the cone angle of the respective shrink-fit chuck.

Description

DESCRIPTION Cooling device for cooling a shrinkage chuck

The invention relates to a cooling device for cooling a shrink chuck, which serves to receive a tool or workpiece.

The state of the art (eg DE.20 2006 019 670 U1) discloses shrink chucks which serve to receive a tool in a machine tool. To clamp the tool in the shrink chuck, the shrink chuck must be heated, whereby a tool receiving opening expands so that the tool can be inserted. Subsequently, the shrink chuck is then cooled again, whereby the tool receiving opening narrows again and thereby clamps the tool. To remove the tool from the

Shrink chuck, the shrink chuck must then be heated again accordingly.

Furthermore, from DE 20 2006 019 670 Ul cooling devices are known to cool such shrinkage chuck. This conventional cooling devices for this purpose comprise two half-shell-shaped contact elements, which are laid from the outside around the tool ^¬ receiving portion of the shrink-fit chuck, and then produce a large-area touch contact with the tool receiving portion of the shrink-fit chuck to be cooled. The shrink chuck is then cooled by conduction from the shrink chuck to the cooler. A disadvantage of this known cooling device is the fact that the inner contour of the cooling device must be exactly adapted to the outer contour of the shrink chuck, so that the cooling device tion is suitable only for a single type of Schrutsffutters with a certain outer contour. To cool differently shaped shrink chucks, other shaped cooling means must then be used.

The invention is therefore based on the object to provide a correspondingly improved cooling device, which serves to cool a SchrumpffUtters. This object is achieved by a cooling device according to the invention according to the main claim.

The cooling device according to the invention initially has, in accordance with the prior art, an annular cooling adapter in order to contact the outer contour of the shrinkage filter and thereby conduct heat away from the shrinkage lining by means of heat conduction, whereby the shrinkage lining is cooled. The cooling device according to the invention is now characterized in that the cooling adapter has a plurality of separate contact elements made of a thermally conductive material, which are arranged distributed over the circumference of the cooling adapter and in operation, the outer contour of the shrinkage contact to contact the heat by heat conduction from the shrinkage lining to the contact elements dissipate.

In contrast to the prior art described at the beginning, the individual contact elements are movably mounted in order to be able to adapt to the outer contour of the shrinkage filter.

Preferably, the individual contact elements are movable in the radial direction, so that the individual contact elements Elements can dodge radially outward to adapt to the outer contour of the respective SchrumpfffUtters. The radial displacement of the individual contact elements thus advantageously allows adaptation to different outer diameters of the shrink chuck.

In addition, the individual contact elements are preferably also pivotable in order to adapt to the outer contour of the respective shrinkage filter, d. H. the individual contact elements can pivot in a radial plane about a pivot axis, which is aligned at right angles to the radial plane. This is advantageous because the usual shrink chucks have outer contours with different cone angles, which are usually 4.5 ° or 3 °. Depending on the cone angle of the respective shrinkage filter, the individual contact elements can then pivot correspondingly in order to conform to the conical outer contour of the respective shrinkage filter. Here, the individual contact elements can be pivoted about a maximum pivot angle, which is at least 1 °, 2 °, 3 °, 4 °, 5 °, 6 ° or even at least 7 °. The pivoting of the individual contact elements thus advantageously allows adaptation to different cone angles of the outer contour of the shrink chuck.

The invention offers the advantage that the cooling device without structural adaptations for different types of

Shrink chucks is suitable because the various contact elements of the respective outer contour of the SchrumpffUtters can adapt flexibly.

In a preferred embodiment of the invention, the cooling device has a tensioning device in order to tension the individual contact elements in the radial direction inwards against the outer contour of the shrinkage filter. The clamping device tion ensures that the individual contact elements are pressed from the outside against the respective outer contour of the SchrumpffUtters.

Preferably, the tensioning device includes a plurality of springs, which press the contact elements in each case in the radial direction inwardly against the outer contour of the shrinking filter. In the preferred embodiment of the invention, each of the contact elements is assigned in each case at least one spring, which presses the respective contact element radially inwardly against the outer contour of the SchrumpffUtters. However, it is preferred that at least two springs are associated with each of the contact elements, which are arranged one behind the other along the longitudinal axis of the shrinkage chuck. This advantageously allows inner contours of the contact elements, which deviate from an exactly axially aligned course and, for example, inclined relative to the insertion direction or curved along the insertion direction, without causing a tilting of the contact elements occurs. For example, the springs may be formed as coil springs.

In addition, the cooling device according to the invention preferably comprises a relaxation device for relaxing the contact between the individual contact elements and the

Shrink chuck by the contact elements are moved radially outward. The relaxation device thus moves the contact elements radially outward to introduce or remove the shrinkage chuck. By contrast, the tensioning device moves the individual contact elements radially inwards so that the contact elements rest as well as possible on the outer contour of the shrinkage filter.

In the preferred embodiment of the invention, the expansion device operates pneumatically, for example by means of Compressed air. For this purpose, the individual contact elements can each be connected to a piston rod which carries a piston which can be pressurized pneumatically in order to pull the respective contact element radially outward. In the preferred embodiment, the piston rods each extend substantially radially and carry on their radially outer side a piston which can be acted upon with compressed air.

In the preferred embodiment of the invention, the circumferentially immediately adjacent contact elements each include an air gap to dissipate the heat from the contact elements by convection. Through the air gap between the immediately adjacent contact elements so an air flow can be passed, which heats up when flowing through the air gap and thereby dissipates heat from the contact elements. Preferably, the air gaps between the immediately adjacent contact elements are each wedge-shaped.

In addition, the cooling device may comprise a nozzle arrangement for directing a cooling gas flow (eg air flow) on the contact elements in order to remove the heat from the contact elements by convection, as already briefly mentioned above. Preferably, this gas stream is passed through the air gaps between the immediately adjacent contact elements to dissipate the heat.

The aforementioned Düsena: .Ordnung is preferably formed rin-shaped and coaxial with the annular Kühladap ter arranged. For example, the nozzle assembly is disposed above the cooling adapter and gives the cooling gas flow down on the cooling adapter or in the air gaps between see the immediately neigh th contact elements. For example, the nozzle arrangement can have an annular circumferential slot nozzle in order to discharge the cooling gas stream. In this case, the cooling gas flow thus extends over the entire circumference of the nozzle arrangement. However, it is alternatively also possible that the nozzle arrangement distributed over the circumference has a plurality of nozzles, each of which emit a cooling partial flow.

In the preferred embodiment of the invention, the individual contact elements in cross-section transversely to the insertion substantially T-shaped and have a longitudinal leg and a transverse leg.

In this case, the T-shaped contact elements press with the end of their longitudinal limb, preferably in the radial direction from the outside, onto the outer contour of the shrinkage filter.

At the transverse leg of the T-shaped contact elements, on the other hand, at least one spiral spring is supported radially on the outside, which presses the respective contact element radially inwards.

In this case, the individual contact elements are preferably guided by at least one guide pin which extends radially.

The individual guide pins for guiding the associated contact elements preferably extend coaxially through the individual coil springs.

The transverse limbs of the individual T-shaped contact elements preferably have for carrying out the guide pins each Weil a hole that extends into the longitudinal leg of the respective contact element.

The individual guide pins are preferably secured with their ends in the associated T-shaped contact elements.

For holding the individual contact elements may be provided a retaining ring which is arranged coaxially with the annular cooling adapter and the annular nozzle arrangement.

Preferably, the retaining ring has numerous radially extending guide holes, in which the guide pins are radially displaceable.

The guide bores in this case preferably form a clearance fit for the guide pins, so that the guide pins are not only radially displaceable, but also in a radial plane about a small pivot angle can be pivoted. This makes sense, so that the individual contact elements can be slightly tilted in order to be able to adapt to the respective cone angle of the outer contour of the shrinking filter.

The guide pins preferably each have a head, which rests on the outer lateral surface of the retaining ring and prevents slipping of the guide rods. The range of motion of the T-shaped contact elements is thus preferably limited in the radial direction inwardly when the transverse legs of the immediately adjacent contact elements abut each other and / or when the inner ends of the longitudinal legs of the immediately adjacent contact elements collide.

The individual contact elements are made of a material with a very good thermal conductivity, such as copper fer or a copper alloy in order to dissipate the heat as well as possible.

In the preferred embodiment, the individual contact elements are displaceable in the radial direction and also pivotable in a radial plane. The radial displaceability of the contact elements in this case allows adaptation to different outer diameter of the shrink chuck, while the pivoting of the individual contact elements allows Anpas ^¬ tion to different cone angle of the shrink chuck.

The individual contact elements can have a contact surface for contacting the outer contour of the shrinking ^filter , which can have different shapes. In a Va ^¬ riante of the invention the internal contact surface of the individual contact elements is oriented parallel to the central axis of the annular cooling adapter and extends along the central axis of linear and free of curvature. However, it is also possible alterna ^¬ tive that the contact surface is inclined to the central axis namely in the insertion direction or opposite to the insertion direction. Further, there is also the possibility that the contact surface of each contact element is curved in the insertion direction A ^¬.

Other advantageous developments of the invention are characterized in the subclaims or are explained in more detail below together with the description of the preferred embodiment of the invention with reference to the figures. 1 shows a cross-sectional view through a cooling device according to the invention, an enlarged detail view from FIG. 1A, such as

Figure 2 is a longitudinal sectional ^view through the Kühleinrich ^¬ device according to Figures 1A and IB.

The drawings show a preferred embodiment of a cooling device according to the invention for cooling a shrinking filter, which serves to receive a tool or workpiece, wherein the shrinkage chuck itself is not shown in the drawings.

The cooling device essentially comprises an upper part 1 with a cover 2, a lower part 3 and a connecting part 4, wherein the connecting part 4 is connected by screw connections on the one hand to the upper part 1 and on the other hand to the lower part 3.

The lid 2 is screwed by a screw connection on the upper part 1, wherein the cover 2 also covers a ring-shaped annular channel 5, which is connected to a compressed air supply. On its inside, the lid 2 closes with the upper part 1 an annular circumferential slot 6, which delivers a cooling air stream 7 obliquely un ^¬ th to dissipate heat, as will be detailed erläu- is tert. The cooling air flow 7 is in this case fed from the annular channel 5 and the annular channel 5 is connected to a compressed air supply.

The annular cover 2 and the likewise annular upper part 1 are arranged coaxially with an insertion opening 8, wherein the shrinkage chuck to be cooled can be introduced in the direction of the block arrow into the insertion opening 8 of the cooling device, ie parallel to the central axis 9 of the cooling device. In the likewise annular lower part 3, two guide bores lying one above the other are arranged in pairs, which run radially and each receive a radially displaceable guide pin 10, 11, 12, 13. The individual guide pins 10-13 each have a pin head 14, 15, 16, 17, which rests in the position shown in Figure 2 radially outward on the outer surface of the annular lower part 3 and prevents the guide pins 10-13 slipping radially inward , It should be noted that the guide holes for the guide pins 10-13 form a clearance, so that the guide pins 10-13 are not only radially displaceable in the guide holes, but are also pivotable about a small pivot angle. This is important because the contact elements 18, 19 are also pivotable, as will be explained in detail.

At their radially inner end, the guide pins 10-13 are each connected in pairs to a contact element 18, 19, wherein the contact elements 18, 19 are made of a thermally conductive material (eg copper) and have the task of transmitting heat Derive heat conduction from the shrink chuck. In operation, the contact elements 18, 19 are therefore with their inner contact surface 20, 21 on the outer contour of the shrinkage to be cooled and then make a large-area touch contact ago, which allows good heat dissipation.

The contact elements 18, 19 are in this case pressed by coil springs 22, 23, 24, 25 in the radial direction inwards. The coil springs 22-25 are supported, on the one hand, on the inner wall of the annular lower part 3 and, on the other hand, on the radially outer side of the contact elements 18 and 19, respectively. at the coil springs 22-25, the guide pins 10-13 surrounded spirally.

In addition, the illustrated cooling device has a relaxation device in order to pull the contact elements 18, 19 radially outward. This is necessary to introduce the shrink chuck into the cooling device or to remove the shrink chuck again from the cooling device. For this purpose, the expansion device for each of the contact elements 18, 19 each have a piston rod 26, 27, which extends in the radial direction and carries at its radially outer end in each case a piston 28 and 29 respectively. The pistons 28, 29 can be acted upon by a compressed air passage 30, 31 on one side with compressed air to the piston rod 26, 27 and thus the associated contact element 18, 19 to press radially outward. However, a pressurization of the pistons 28, 29 is only required in this case in order to pull the contact elements 18, 19 radially outward. In normal cooling operation, however, no pressurization is required, since then the spiral springs 22-25 press the contact elements 18, 19 radially inwardly against the outer contour of the shrinkage filter.

The individual contact elements 18, 19 can therefore perform an evasive movement for adaptation to differently shaped shrink chucks.

On the one hand, as part of this evasive movement, a radial displacement of the contact elements 18, 19 is possible so that the contact elements 18, 19 can adapt to the outer diameter of the respective shrinkage filter.

On the other hand, as part of the evasive movement, it is also possible to pivot the contact elements 18, 19 about a pivot axis AI or A2, wherein the pivot axes AI, A2 because they are aligned at right angles to a radial plane. The pivoting direction is shown here in FIG. 2 by a double arrow. This pivotal movement of the contact elements 18, 19 allows adaptation of the contact elements 18, 19 to different cone angles of the outer contour of the shrink chuck.

To enable this pivotal movement of the contact elements 18, 19, the guide holes for the guide pins 10-13 each play fits, so that the guide pins 10-13 can also pivot about a small tilt angle in the radial plane. This is important because a play-free Li ^¬ near leadership of the guide pins 10-13 would prevent pivotal movement of the contact elements 18, 19.

Furthermore, it is to be noted that the immediately adjacent contact elements 18, 33 each have a substantially keilför ^¬-shaped air gap 32 include through which the cooling air current is conducted 7 to dissipate heat by convection. During operation, therefore, the heat initially passes from the shrinkage chuck to the contact elements 18, 33. Subsequently, the heat from the contact elements 18, 33 passes through heat conduction to the cooling air flow 7, which is passed through the wedge-shaped air gaps 32. With the cooling air flow 7, the heat then leaves the cooling device by convection.

The invention is not limited to the preferred embodiment described above. Rather, a multiplicity of variants and modifications is possible, which likewise make use of the concept of the invention and therefore fall within the scope of protection. In particular, the invention also claims protection of the subject matter and the features of the dependent claims independently of the respective ones Claims and in particular without the features of the main claim.

Reference sign list:

1 upper part

2 lids

3 lower part

4 connecting part

5 ring channel

6 slot nozzle

7 cooling air flow

8 insertion opening

9 central axis of the cooling device

10-13 guide pins

14-17 pin head

18, 19 contact element

20, 21 contact surface of the contact elements

22-25 coil springs

26, 27 piston rod

28, 29 pistons

30, 31 Compressed air duct

32 air gap

33 contact element

AI pivot axis of the contact element 18th

A2 pivot axis of the contact element 19th

Claims

1. Cooling device for cooling a shrinking filter for receiving a tool or a workpiece, with

a) an annular cooling adapter for contacting the outer contour of the shrinkage filter and for removing heat from the shrinkage lining by heat conduction,

characterized,

b) that the cooling adapter several separate contact elements

(18, 19) made of a thermally conductive material, which are arranged distributed over the circumference of the cooling adapter and in operation touch the outer contour of the shrink chuck to the heat by heat conduction from the shrink chuck on the contact elements (18, 19) from ^¬ perform , and

c) that the individual contact elements (18, 19) are each movable in order to adapt to the outer contour of the shrink chuck.

2. Cooling device according to claim 1,

characterized,

a) that the individual contact elements (18, 19) are each movable in the radial direction in order to adapt to the outer contour of the shrinkage filter, and / or

b) that the individual contact elements (18, 19) in each case in a radial plane are pivotable radially to the central axis (9) of the annular cooling adapter and indeed to a

Pivot axis (AI, A2), which is aligned at right angles to the radial plane, so that the individual contact elements (18, 19) can be adapted to different cone angles of the shrinking filter.

3. Cooling device according to one of the preceding claims, characterized by a clamping device (22-25) for clamping the individual contact elements (18, 19) in the radial direction inwardly against the outer contour of the shrink chuck.

4. Cooling device according to claim 3,

characterized,

a) that the tensioning device (22-25) has a plurality of springs (22-25) which press the contact elements (18, 19) inwards in the radial direction against the outer contour of the shrinkage filter,

b) that each of the contact elements (18, 19) is preferably assigned in each case at least one spring (22-25) which presses the respective contact element (18, 19) radially inwards,

c) that the springs (22-25) are preferably coil springs (22- 25).

5. Cooling device according to one of the preceding claims, characterized by a relaxation device (26-31) for releasing the contact between the individual contact elements (18, 19) and the shrink chuck by the contact elements (18, 19) are moved radially outward ,

6. Cooling device according to claim 5,

characterized,

a) that the expansion device (26-31) operates pneumatically, and / or

b) that the individual contact elements (18, 19) are each connected to a piston rod (26, 27) which carries a piston (28, 29) which pneumatically pressurizes can be beat to pull the respective contact element (18, 19) radially outward, and / or

c) that the piston rods (26, 27) each extend substantially radially, and / or

d) that the pistons (28, 29) each radially outward to the

Piston rods (26, 27) are arranged.

Cooling device according to one of the preceding claims characterized

that the circumferentially immediately adjacent contact elements (18, 33) each include an air gap (32) to dissipate the heat from the contact elements (18, 33) by convection, and

the air gaps (32) between the directly adjacent contact elements (18, 33) are preferably wedge-shaped in each case.

8. Cooling device according to one of the preceding claims, characterized by a nozzle arrangement (6) for discharging a cooling gas stream (7) on the contact elements (18, 19, 33), in particular in the air gaps (32) between the contact elements (18, 33) to dissipate the heat from the contact elements (18, 19, 33) by convection. 9. Cooling device according to claim 8,

characterized,

a) that the nozzle assembly (6) is annular and coaxial with the annular cooling adapter, b) that the nozzle assembly (6) is preferably arranged above the cooling adapter and the cooling gas stream (7) down on the cooling adapter.

10. Cooling device according to claim 9,

characterized, a) that the nozzle assembly (6) has an annular circumferential slot nozzle (6) to deliver the cooling gas stream (7), or

b) that the nozzle arrangement has a plurality of nozzles distributed over the circumference.

11. Cooling device according to one of the preceding claims, characterized in that

a) that the individual contact elements (18, 19) in cross section are substantially T-shaped and have a longitudinal leg and a transverse leg, and / or b) that the individual T-shaped contact elements (18, 19) with the end of their Press the longitudinal limb in the radial direction from the outside onto the outer contour of the shrinking filter, and / or

c) that on the transverse leg of the T-shaped contact elements (18, 19) radially at least one respective coil spring (22-25) is supported, which presses the respective contact element (18, 19) radially inwardly, and / or d) that the individual contact elements (18, 19) are each guided by at least one guide pin (10-13), which runs radially, and / or

e) that the individual guide pins (10-13) for guiding the associated contact elements (18, 19) each extend coaxially through the individual coil springs (22-25), and / or

f) that the transverse limbs of the individual T-shaped contact elements (18, 19) for the passage of the guide pins (10-13) each have a bore which extends into the longitudinal limb of the respective contact element (18,

19) extends, and / or

g) that the guide pins (10-13) with their ends in the associated T-shaped contact elements (18, 19) are attached, and / or h) that for holding the contact elements (18, 19), a retaining ring is provided, which is arranged coaxially with the annular cooling adapter and the annular nozzle arrangement (6), and / or

i) that the retaining ring has radially extending guide holes, in which the guide pins (10-13) are radially displaceable, and / or

j) that the guide holes for the guide pins (10- 13) form a clearance, so that the guide pins are not only radially displaceable, but also in the radial plane about the pivot axis (AI, A2) are pivotable, in particular by a pivot angle of at least 1 °, 2 °, 3 °, 4 ° or even at least 5 °, and / or k) that the guide pins (10-13) each have a head (14- 17) which rests against the outer surface of the retaining ring and slipping the guide pins (10-13) prevents inward, and / or

1) that the range of motion of the T-shaped contact elements (18, 19) in the radial direction is limited inwardly when the transverse legs of the immediately adjacent contact elements (18, 33) abut each other and / or if the inner ends of the longitudinal ^{leg of the immediacy} bar adjacent contact elements (18, 33) collide.

12. Cooling device according to one of the preceding claims, characterized

a) that the individual contact elements (18, 19) in each case

Copper or a copper alloy, and / or b) that the individual contact elements (18, 19) are not only radially displaceable, but also in the radial plane about the pivot axis (AI, A2) are pivotable, in particular by a pivot angle of at least 1 ° , 2 °, 3 °, 4 ° or even at least 5 °, and / or the individual contact elements (18, 19) for contacting the outer contour of the shrinkage filter have a contact surface (20, 21),

cl) which is aligned parallel to the central axis (9) of the annular cooling adapter and along the central axis (9) of the annular cooling adapter is linear and free of curvature, or

c2) the linear and extends (the central axis 9) of the adapter is inclined cooling namely in the insertion direction ^¬, or

c3) which extends linearly and to the central axis (9) of the

Cooling adapter is inclined, and that against the entry direction, or

c4) which is curved in the insertion direction.