APPLIANCE FOR HEAT TREATMENT AND METHOD FOR OPERATING THE APPLIANCE

Abstract

An appliance for heat treatment or inductive heating or cooling of shrink chucks for shaft-type tools or a shrinkage appliance or cooling appliance or shrinkage appliance with a cooling appliance, includes a receiving device or opening receiving a shrink chuck, a heat treatment unit surrounding the receiving device relative to a central axis, an induction coil arrangement or cooling unit, and a measuring unit for temperature measurement of the shrink chuck. For exactly measuring shell temperatures of chucks in receiving openings, the measuring unit has temperature sensors around the receiving device or one temperature sensor inclined around the central axis for contactless detection of the shell temperature, or the measuring unit has sensors around the receiving device including a first temperature sensor for contactless detection of a shell temperature, and a different type of second sensor for detecting another property of the shrink chuck in the receiving device.

Claims

1. An appliance for heat treatment or inductive heating or cooling of shrink chucks for shaft-shaped tools or a shrinkage appliance or a cooling appliance or a shrinkage appliance with a cooling appliance, the appliance comprising: a receiving device or a receiving opening for receiving the shrink chuck; a heat treatment unit or an induction coil arrangement or a cooling unit surrounding said receiving device relative to a central axis; and a measuring unit for temperature measurement of the shrink chuck; said measuring unit having a plurality of temperature sensors disposed around said receiving device for detection of a shell temperature of the shrink chuck disposed in said receiving device, or said measuring unit having at least one temperature sensor being disposed around said receiving device and inclined relative to the central axis for detection of the shell temperature of the shrink chuck disposed in said receiving device.

2. The appliance according to claim 1, wherein said heat treatment unit concentrically surrounding said receiving device, said measuring unit is configured for contactless temperature measurement of the shrink chuck, and said plurality of temperature sensors are configured for contactless detection of the shell temperature of the shrink chuck.

3. The appliance according to claim 1, wherein at least two or all of said temperature sensors have different configurations or measurement settings.

4. The appliance according to claim 1, wherein at least one of: each of said plurality of temperature sensors, or said inclined temperature sensor, being configured as a radiation detector or as a pyrometer with a radiation detector for detecting thermal radiation from the shrink chuck disposed in said receiving device.

5. The appliance according to claim 1, wherein said inclined temperature sensor has an inclination angle of between 30° and 60°.

6. The appliance according to claim 6, wherein said inclination angle is 45°.

7. The appliance according to claim 1, wherein at least one of: at least one of said plurality of temperature sensors, or said inclined temperature sensor, has at least one of a focusing device or a shielding device or an aperture.

8. An appliance for heat treatment or inductive heating or cooling of shrink chucks for shaft-shaped tools or a shrinkage appliance or a cooling appliance or a shrinkage appliance with a cooling appliance, the appliance comprising: a receiving device or a receiving opening for receiving the shrink chuck; a heat treatment unit or an induction coil arrangement or a cooling unit surrounding said receiving device relative to a central axis; and a measuring unit for contactless temperature measurement of the shrink chuck; said measuring unit having a plurality of sensors disposed around said receiving device, said plurality of sensors including at least one first sensor being a temperature sensor for contactless detection of a shell temperature of the shrink chuck disposed in said receiving device, and at least one second sensor being a sensor of a type different than said first sensor for detection of another property of the shrink chuck disposed in said receiving device.

9. The appliance according to claim 8, wherein said heat treatment unit concentrically surrounds said receiving device, said measuring unit is configured for contactless temperature measurement of the shrink chuck, and said first sensor is configured for contactless detection of the shell temperature of the shrink chuck.

10. The appliance according to claim 8, wherein said at least one second sensor is a distance sensor or an optical sensor or an ultrasound sensor or a laser sensor or a reflection sensor or an infrared reflection sensor.

11. The appliance according to claim 8, wherein said at least one second sensor is a distance sensor configured for contactless measurement.

12. The appliance according to claim 8, wherein said at least one first temperature sensor is configured as a radiation detector or as a pyrometer with a radiation detector for detecting thermal radiation from the shrink chuck disposed in said receiving device.

13. The appliance according to claim 8, wherein at least one of a plurality of first temperature sensors or a plurality of second sensors are disposed around said receiving device.

14. The appliance according to claim 8, wherein at least two or a plurality or all of said first temperature sensors have different configurations or measurement settings.

15. The appliance according to claim 8, wherein said sensors are disposed in at least one of circular form or at different axial heights relative to said central axis at or around said receiving device.

16. The appliance according to claim 8, wherein at least one of said heat treatment unit or a housing of said heat treatment unit has at least one or more recesses in or at at least one of which a respective one of said sensors is disposed.

17. The appliance according to claim 16, wherein one of said recesses is configured as a measurement channel running through at least one of said heat treatment unit or said housing of said heat treatment unit.

18. The appliance according to claim 17, wherein said measurement channel runs substantially radially relative to said central axis.

19. The appliance according to claim 17, wherein said heat treatment unit is configured as an induction coil arrangement and has at least one of: a coil winding wound so as to leave said measurement channel or a plurality of measurement channels free, or induction coil arrangements and said measurement channel or said measurement channels being formed between said induction coil arrangements.

20. The appliance according to claim 17, wherein at least one of said sensors is disposed at least partially in or at said measurement channel or performs measurement through said measurement channel or each of said sensors is disposed at least partially in or at a respective measurement channel or performs measurement through said respective measurement channel.

21. The appliance according to claim 17, which further comprises a protective window inserted into said measurement channel.

22. The appliance according to claim 21, wherein said protective window is exchangeable, permeable to thermal radiation and configured for protecting said sensor against at least one of contamination or damage.

23. The appliance according to claim 8, which further comprises a substantially ring-shaped structural unit, said sensors being disposed in said substantially ring-shaped structural unit at least one of substantially circularly about a central axis of said substantially ring-shaped structural unit at different axial heights or at an identical axial height relative to said central axis of said substantially ring-shaped structural unit.

24. The appliance according to claim 23, wherein said substantially ring-shaped structural unit is disposed coaxially relative to said central axis in the appliance or axially adjacent said heat treatment unit or said induction coil arrangement or cooling unit.

25. The appliance according to claim 23, wherein said sensors disposed in said substantially ring-shaped structural unit are sensors of an identical type.

26. The appliance according to claim 8, which further comprises a processing unit or microcontroller for ascertaining a resulting shell temperature of the shrink chuck disposed in said receiving device, said processing unit or microcontroller being configured to use said sensors or a multiplicity of said sensors for ascertaining the resulting shell temperature of the shrink chuck disposed in said receiving device.

27. The appliance according to claim 26, wherein said heat treatment unit or induction coil arrangement or cooling unit has a controller configured to control a power of said heat treatment unit or an electrical current supply to said heat treatment unit or induction coil arrangement in dependence on the resulting shell temperature.

28. The appliance according to claim 8, which further comprises a display device for displaying a thermal state.

29. The appliance according to claim 28, wherein the thermal state is a thermal state of a tool receptacle or the shrink chuck disposed in said receiving device.

30. A method for operating an appliance, the method comprising: providing an appliance according to claim 8 for inductive heating of the shrink chuck or for cooling of the shrink chuck; and ascertaining a resulting shell temperature of the shrink chuck disposed in said receiving device detected by said plurality of sensors or ascertaining shell temperatures of the shrink chuck disposed in said receiving device detected by said plurality of temperature sensors.

31. The method according to claim 30, which further comprises: inductively heating and thus expanding the shrink chuck in said receiving device surrounded by said heat treatment device or induction coil arrangement, and controlling the heating by using the resulting shell temperature, or cooling the shrink chuck in said receiving device surrounded by said heat treatment device configured as a cooling unit, and controlling the cooling by using the resulting shell temperature.

32. The method according to claim 30, which further comprises: setting different calibrations or settings or different emissivities at a plurality of temperature sensors; at least one of comparing or jointly processing measurements from said plurality of temperature sensors; and determining the resulting shell temperature from the measurements.

33. The method according to claim 30, which further comprises evaluating a signal from only one radiation sensor in different ways.

34. The method according to claim 30, which further comprises performing a calibration or setting or adjustment at least at one temperature sensor by using a measurement from said second sensor, or determining how the resulting shell temperature is determined by using a measurement from said second sensor or from measurements from said plurality of temperature sensors.

35. An appliance for heat treatment or for inductive heating or cooling of shrink chucks for shaft-shaped tools or a shrinkage appliance or a cooling appliance or a shrinkage appliance with a cooling appliance, the appliance comprising: a receiving device or a receiving opening for receiving the shrink chuck; a heat treatment unit or an induction coil arrangement or a cooling unit surrounding said receiving device relative to a central axis; and a measuring unit for temperature measurement of the shrink chuck, said measuring unit having a quotient pyrometer.

36. The appliance according to claim 35, wherein said heat treatment unit concentrically surrounds said receiving device, and said measuring unit contactlessly measures a temperature of the shrink chuck.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0082] FIG. 1 is a diagrammatic, axial-sectional view of a shrinkage appliance with an induction coil arrangement equipped with multiple temperature sensors that perform measurement contactlessly, according to one embodiment;

[0083] FIG. 2 is a perspective view of the induction coil arrangement of the shrinkage appliance as per FIG. 1;

[0084] FIG. 3 is a radial sectional-view through the induction coil arrangement of the shrinkage appliance as per FIG. 1;

[0085] FIG. 4 is an axial-sectional view through the induction coil arrangement of the shrinkage appliance as per FIG. 1;

[0086] FIG. 5 is a perspective view of a shrinkage appliance with a cooling appliance, and with a measuring ring integrated into the cooling appliance, according to an embodiment;

[0087] FIG. 6 is a side-elevational view of the shrinkage appliance with the cooling appliance, and with the measuring ring integrated into the cooling appliance, as per FIG. 5, illustrated from one side;

[0088] FIG. 7 is a perspective view of the measuring ring of the shrinkage appliance as per FIG. 5;

[0089] FIG. 8 is a block diagram illustrating the functioning of the measuring ring of the shrinkage appliance as per FIG. 5; and

[0090] FIGS. 9a and 9b are respective plan and sectional views of a further measuring ring.

DETAILED DESCRIPTION OF THE INVENTION

[0091] Shrinkage Appliance with Contactless Temperature Measurement (FIGS. 1 to 4)

[0092] Referring now to the figures of the drawings in detail and first, particularly, to FIG. 1 thereof, there is seen a shrinkage appliance 2 for the shrink-fitting or shrinkage-based removal 120 of shaft-type tools 6 or (as shown) of a milling tool 6 into or from a shrink chuck 4, having an induction coil arrangement 12 that is equipped with multiple temperature sensors 16 that perform measurement contactlessly.

[0093] FIGS. 2 to 4 show the induction coil arrangement 12 in detail in different illustrations/sections.

[0094] As shown in FIG. 1, for the purposes of the shrink-fitting or shrinkage-based removal 120, the shrinkage appliance 2 has the induction coil arrangement 12, which is displaceable along its coil axis 10 and which serves for inductively heating 120 the shrink chuck 4 (compare in particular FIGS. 2 to 4), and a (schematically illustrated) control unit 28 for the process and heating control 160 for the shrink chuck 4.

[0095] The shrink chuck 4—illustrated in this case in FIG. 1—includes, as a sleeve section 32, a cylindrically hollow clamping region 34, which is accessible through a face opening 36 at the front face end 38 of the shrink chuck 4 for the insertion of the tool or miller shaft 40.

[0096] The clamping region 34 of the shrink chuck 4 has a somewhat smaller nominal diameter than the tool shaft 40, in such a way that the tool shaft can be fitted with clamping action in a manner known per se by (inductive) heating 120 of the shrink chuck 4. In the shrink-fitted state, the tool or miller shaft 40 is held rotationally conjointly by way of a frictional interference fit, for the transmission of a torque, on the front working section 42 of the rotary tool 6.

[0097] For the shrinkage-based removal, it is likewise the case that only the shrink chuck 4 is heated 120 at one side until the thermal expansion releases the tool or miller shaft 40 again for the removal thereof.

[0098] As shown in FIGS. 1 to 4, the induction coil arrangement 12 surrounds, concentrically about its coil axis 10, a receiving opening 8 for the shrink chuck 4.

[0099] Axial displacement of the induction coil arrangement 12—along its coil axis 10—causes the shrink chuck 4 to be brought into the desired warming/heating position in relation to the induction coil arrangement 12 (compare FIG. 1). For this purpose, it is also possible for stop elements, for example a pole disk, to be provided on the induction coil arrangement.

[0100] As can be seen in particular from FIGS. 1, 3 and 4, in order to generate an electromagnetic alternating field, the induction coil arrangement 12 includes a coil winding 24 in a coil housing 18.

[0101] In order to be able to detect the shell temperature of the shrink chuck 4 during the heating 120, multiple, in this case six, measurement channels 22, which each open into the receiving opening 8, extend through the induction coil arrangement 12 radially with respect to the coil axis 10.

[0102] In this case, the—six—measurement channels 22 are disposed, as shown in FIGS. 3 and 4, with approximately uniform pitch about the coil axis 10, at the same axial height with respect to the coil axis 10 in an axial central region 44 of the induction coil arrangement 12, between the axial ends thereof, wherein the coil winding 24 is wound around the six measurement channels 22 so as to leave these free. The coil-side inner section 46 of the respective measurement channel 22 is aligned with a recess 26 in the outer wall 48 of the induction coil housing 50 (and thus also with a total of six recesses in the outer wall 48 of the induction coil housing 50).

[0103] Into each of the—six—recesses 26 of the induction coil housing 50, there is inserted in each case one temperature sensor 16 which performs measurement contactlessly and which is in this case a radiation detector 16 or pyrometer 16 which (contactlessly) measures thermal radiation, which temperature sensor, through “its respective” measurement channel 22 in the coil winding 24, detects thermal radiation emitted by the shrink chuck 4.

[0104] The control unit 28 is coupled at an input side to the temperature sensors 16 by cables 52—and thus receives the measurement signals from the temperature sensors, which measurement signals are processed 140 jointly in the control unit 28 to obtain a resulting shell/surface temperature of the shrink chuck 4 that is to be measured. In a first, simple approach, this is performed for example by calculation of an average value. If, for example, the ascertained resulting shell/surface temperature of the shrink chuck that is to be measured exceeds a specified setpoint temperature, the heating power of the induction coil arrangement is reduced 160.

[0105] In this way, during the heating 120 of the shrink chuck 4, temperature control can be performed on the basis of the ascertained resulting shell temperature, for example by virtue of the electrical current supply to the induction coil arrangement being influenced 160, by using a control unit 28, in a manner dependent on the resulting shell temperature.

[0106] Shrinkage Appliance with Contactless Temperature Measurement by Using a Quotient Pyrometer (Compare FIGS. 1 to 4)

[0107] FIGS. 1 to 4 also show—as a modification indicated by the reference designation 30 (between parentheses), a “quotient pyrometer”—an alternative shrinkage appliance 2 for the shrink-fitting or shrinkage-based removal 120 of shaft-type tools 6 or (as shown) of a milling tool 6 into or from a shrink chuck 4 with—in this modified case—an induction coil arrangement 12 equipped with a quotient pyrometer 30.

[0108] This embodiment of the alternative shrinkage appliance differs from the previous embodiment solely in that, as shown in FIGS. 1 to 4, instead of the six temperature sensors/radiation detectors 16 which are seated in/at the six measurement channels 22 and perform measurement through them, a single quotient pyrometer 30 is used, which is disposed correspondingly in/at one of the measurement channels 22. The resulting shell/surface temperature is thus obtained in this case solely from the measurement by using quotient pyrometer 30.

[0109] All of the previous statements relating to the shrinkage appliance 2 apply in this case correspondingly, and do not need to be repeated.

[0110] Shrinkage Appliance with Cooling Appliance with Contactless Temperature Measurement (FIGS. 5 to 8)

[0111] FIGS. 5 and 6 show a shrinkage appliance 2 with a cooling appliance 12, as presented and described in detail in European Application EP 3 444 064 A1 (see FIGS. 1 and 4 and paragraphs [0014] to [0026] of European Application EP 3 444 064 A1), corresponding to U.S. Pat. No. 11,141,797, the content of which is hereby incorporated (reference document) into this application.

[0112] As presented by FIG. 5 (compare also FIG. 4 of European Application EP 3 444 064 A1, corresponding to U.S. Pat. No. 11,141,797 (reference document)) and FIG. 6 (compare also FIG. 1 of European Application EP 3 444 064 A1, corresponding to U.S. Pat. No. 11,141,797 (reference document))), the cooling appliance 12 has a cooling head 72 which is guided displaceably on a frame or stand 70 and which includes at least one cooling attachment 74 that can be mounted onto that part of the shrink chuck 4 which is to be cooled. The cooling attachment 74 includes a receiving opening 8 (compare passage opening 6 in European Application EP 3 444 064 A1, corresponding to U.S. Pat. No. 11,141,797), the inner contour/diameter of which is adapted to the outer contour/diameter of that part of the shrink chuck 4 (not illustrated) which is to be cooled (in such a way that it is possible for the cooling attachment 74 to be pushed/mounted onto a shrink chuck 4 that is to be cooled).

[0113] For further details relating to the shrinkage appliance 2 and the cooling appliance 12 thereof, reference is made to European Application EP 3 444 064 A1, corresponding to U.S. Pat. No. 11,141,797 (see FIGS. 1 and 4 and paragraphs [0014] to [0026] of European Application EP 3 444 064 A1, corresponding to U.S. Pat. No. 11,141,797)).

[0114] As is also shown in FIGS. 5 and 6, a measuring or sensor ring 56 (which is open over a particular circular ring sector) (compare FIG. 7 (an alternative sensor ring is shown in FIGS. 9a and 9b)) is integrated into the cooling attachment 74, through the use of which measuring or sensor ring the shell temperature of a shrink chuck 4 that is received in the cooling attachment 74 or the receiving opening 8 thereof can be—contactlessly—measured. The integration is such that, at the lower edge of the cooling attachment 74, the measuring ring 56 (compare FIG. 7) is disposed coaxially (with its central axis 58) with respect to the central axis 10 of the cooling head 72 or cooling attachment 74.

[0115] In this case, the inner diameter of the measuring ring 56 is substantially equal to that of the cooling attachment 74 (at the lower end thereof), whereby the measuring ring is thus part of the receiving opening 8.

[0116] FIG. 7 shows the measuring ring 56 in detail in a state in which it has been cut open “at the top,” allowing a view into a housing 76 of the measuring ring 56.

[0117] As illustrated in FIG. 7, the measuring ring 56 is a nearly-closed ring-shaped body, with two ring limbs 88, 90 that are situated opposite one another at its open sector.

[0118] As is also shown in FIG. 7, in the measuring ring housing 76 that forms the body of the measuring ring 56, there are received several sensors 60, 16, 62, 96, 98 of different types, specifically three mutually adjacent disposed infrared temperature sensors 16 in a left-hand limb 88 of the measuring ring 56 that is graphically illustrated in FIG. 7, and an ultrasound distance sensor 60, 62, 96 including a transmitter 78 and a receiver 80, and a reflection sensor 60, 62, 98, in a right-hand limb 90 of the measuring ring 56 that is graphically illustrated in FIG. 7.

[0119] All of these sensors 60, 16, 62, 96, 98 are received in the measuring ring 56 or in the housing 76 thereof in such a way that their respective measuring direction is directed radially toward the central axis 58, 10. For this purpose, the measuring ring housing 76 also provides radially inner passages or openings 92 at which the sensors 60, 16, 62, 96, 98 are disposed and through which the sensors can perform measurement in a radially inward direction.

[0120] In an embodiment that is not illustrated, the sensors 60, 16, 62, 96, 98 may also be oriented substantially perpendicularly with respect to the outer shell of the shrink chuck 4, which in many cases is of conical shape.

[0121] Through the use of lines (not illustrated), the sensors 60, 16, 62, 96, 98 are connected to a microcontroller 86 (processing unit 66) that is likewise received in the measuring ring 56 or in the housing 76 thereof, in such a way that measurement signals from the sensors 60, 16, 62, 96, 98 are supplied to the microcontroller for processing, in this case in particular for the purposes of ascertaining 140 a resulting shell temperature of a shrink chuck 4 that is received in the cooling attachment 74.

[0122] The microcontroller 86 in turn is connected through a feed line 84 to a control unit 68, or for short a controller 68, of the cooling appliance 12, to which the microcontroller transmits its signals such as the resulting shell temperature. The controller 68 can then control 160 a cooling operation 120 (of a shrink chuck 4 that is received in the cooling attachment 74) in a manner dependent on presently ascertained shell temperatures.

[0123] As is also shown in FIG. 7, the measuring ring 56 provides an LED (thermal) status indicator 64 in the form of two colored LEDs (light-emitting diodes) 82, 94, which are disposed at the face sides of the two limbs 88, 90 and which are thus visible to a user and of which one is red 82 and the other is green 94 and which, being likewise connected through the microcontroller 86 to the controller 68, are also controlled by using the controller 68.

[0124] An—illuminated—green LED (light-emitting diode) 94 indicates a thermal state of a shrink chuck 4 that has for example cooled to such an extent that it can be safely touched using a bare hand; an—illuminated—red LED (light-emitting diode) 82 indicates a thermal state of a shrink chuck 4 that has not yet (sufficiently) cooled down. Red flashing of the red LED (light-emitting diode) 82 indicates an active cooling operation by using the cooling arrangement 12.

[0125] FIG. 8 illustrates the functioning 100 or the interaction 200 of the various sensors 60, 16, 62, 96, 98, during the measurements performed thereby or during the ascertainment 140 of the shell/surface temperature of a shrink chuck 4 which is to be cooled by cooling, or which is received in the cooling attachment 74, and control 160.

[0126] The measuring ring 56 or the sensors 60, 16, 62, 96, 98 thereof (and light-emitting diodes 82, 94) are active or are switched into an active state (1) as soon as the cooling attachment 74—with integrated measuring ring 56—is moved downward from above over the shrink chuck 4 that is to be cooled, (2) during the cooling operation 120, in which the shrink chuck 4 is received in the cooling attachment 74 (and is cooled (in a manner controlled by using the controller 68 (note: the controller 68 sets the cooling parameters, such as a cooling duration etc., optionally using the ascertained surface temperature or surface color of a shrink chuck 4))) and (3) until the cooling attachment 74 with integrated measuring ring 56 has been lifted off—pushed upward from—the shrink chuck 4 (altogether referred to for example as “measuring phase”/“measuring cycle”).

[0127] The start and the end of the measurements or of the measuring phase ((1) to (3)) may be ascertained (automatically) by using the (ultrasound) distance sensor 62, 96 or 78/80, which detects 220—by distance measurement—whether a shrink chuck 4 is situated in the measuring ring 56.

[0128] During the temperature measurement or temperature ascertainment 140 (which is performed by the microcontroller 86), the surface or the surface color of the shrink chuck 4 that is received in the measuring ring 56 is then ascertained (200) by using the reflection sensor 62, 98 using the distance values ascertained by using the distance sensor 62, 96, 78, 80. That is to say, in this case, specifically whether or not the shrink chuck 4 has a black surface.

[0129] On the basis of this information, those infrared temperature sensors 16—of the three infrared temperature sensors 16 that are received in the measuring ring 56—which have been (pre-)set/calibrated for the present surface of the shrink chuck 4 that is (presently) received in the measuring ring 56 (“black”/“not black” or “silver,” “white”) are selected 180 for the temperature ascertainment/calculation 140.

[0130] In this case, in the case of the measuring ring 56, a first of the three infrared temperature sensors 16 is set/calibrated for a black surface (“black temperature sensor”), whereas the other two infrared temperature sensors 16 are set/calibrated for non-black surfaces, for example silver and white (“non-black temperature sensors”).

[0131] If, by using the reflection sensor 62, 98, a “black” shrink chuck 4 is detected in the measuring ring 56, then the temperature ascertainment 140 is performed using the single “black” infrared temperature sensor 16; if a “non-black” shrink chuck 4 is detected in the measuring ring 56, then the temperature ascertainment 140 is performed using the two other, “non-black” temperature sensors 16, for example by calculation of an average value from the values of the two “non-black” temperature sensors 16, 16.

[0132] The control 160 of the cooling 120 is then performed on the basis of the thus ascertained surface/shell temperatures of a shrink chuck 4 that is situated in the measuring ring 56, and the LED (thermal) status indicator light-emitting diodes 82, 94 and 64 are actuated 160 correspondingly to the ascertained surface/shell temperatures.

[0133] Specifically, the light-emitting diodes may be controlled in this case in such a way that, (1) if the cooling attachment 74 is firstly pushed with the measuring ring 56 over the (hot) shrink chuck 4 that is to be cooled, the red light-emitting diode 82—illuminated red—indicates the hot state of the shrink chuck 4 or of the surface/shell thereof.

[0134] When the cooling attachment 74 has then been pushed fully over the shrink chuck 4 and the cooling operation 120 is started (2), the red light-emitting diode 82 flashes during the cooling operation 120 and indicates the “cooling” 120.

[0135] When the cooling operation 120 has ended and the cooling attachment 74 has been raised (3), then the red light-emitting diode 82 illuminates if the shrink chuck 4 is still too hot, and the green light-emitting diode 94 illuminates if the shrink chuck 4 has cooled down sufficiently. If the light-emitting diode 82, illuminated red, still indicates that the shrink chuck 4 is too hot, then the cooling attachment 74 can be pushed down over the shrink chuck 4 again and a further cooling operation 120 can be performed.

[0136] It is optionally also possible for the entire cooling operation 120 to be automatically coupled to the temperature ascertainment 140 and controlled 160 through the use thereof.

[0137] It would furthermore also be possible for not just the selection of the (preset) infrared temperature sensors 16 to be made on the basis of the reflection measurement (98) but also for the setting of one or more of the infrared temperature sensors 16 to be performed on the basis of a present reflection measurement (98). The one or more infrared temperature sensors 16 that are then (presently) set in this way can then be used for the temperature ascertainment 140 of the shell/surface temperature of the shrink chuck 4. It is optionally also possible to omit a “correction” of the reflection measurement (98) by using the distance sensor (96, 78, 80).

[0138] It is additionally also pointed out that a measuring ring 56 corresponding to the above-described measuring ring 56 may also be disposed at an induction coil arrangement 12 of a/the shrinkage appliance 2 in order, there, to measure the shell temperatures of shrink chucks 4 disposed in the receiving opening 8 of the induction coil arrangement 12 (compare FIGS. 1 to 4). It is correspondingly also possible for a measuring ring 56 corresponding to the above-described measuring ring 56 to be disposed at independent or individually operating, separate cooling appliances 12.

[0139] FIGS. 9a and 9b show an alternative measuring ring 56 (which is usable or used in the same way with regard to its functioning) which can be integrated into the cooling attachment 74, with FIG. 9a showing the measuring ring in its entirety and FIG. 9b showing the measuring ring in a detail in a state in which it has been cut open “at the top.”

[0140] As illustrated in FIG. 9a, this measuring ring 56 is also a nearly-closed ring-shaped body, with two ring limbs 88, 90 that are situated opposite one another at its open sector.

[0141] As is also shown in FIG. 9a (and FIG. 9b in the detail), in the measuring ring housing 76 that forms the body of the measuring ring 56, there is received a single temperature sensor 60, specifically an infrared temperature sensor 16′ in a left-hand limb 88 of the measuring ring 56 that is diagrammatically illustrated in FIG. 9a.

[0142] Irrespective of this, it is also possible for holding devices other than the measuring ring 56 to be provided for the temperature sensor 16′.

[0143] The temperature sensor 60 or 16′ is equipped with an aperture 54.

[0144] By contrast to the measuring ring 56 described above (according to FIG. 7), this temperature sensor 60 or 16′ is in this case received in the measuring ring housing 76 so as to be inclined with respect to the central axis 10 by an angle α of approximately 45°.

[0145] Through the use of lines (not illustrated), the temperature sensor 60 or 16′ is connected to a microcontroller 86 (processing unit 66, not visible) that is likewise received in the measuring ring 56 or in the housing 76 thereof, in such a way that measurement signals from the temperature sensor 60 or 16′ are supplied to the microcontroller for processing, in this case in particular for the purposes of ascertaining 140 the shell temperature of a shrink chuck 4 that is received in the cooling attachment 74.

[0146] The microcontroller 86 in turn is connected (in a manner which is not visible) through a feed line 84 to a control unit 68, or for short a controller 68, of the cooling appliance 12, to which the microcontroller transmits its signals such as the shell temperature.

[0147] The controller 68 can then control 160 a cooling operation 120 (of a shrink chuck 4 that is received in the cooling attachment 74) in a manner dependent on the present shell temperatures.

[0148] As is also shown in FIG. 9a, the measuring ring 56 provides an LED (thermal) status indicator 64 in the form of two colored LEDs (light-emitting diodes) 82, 94, which are disposed at the face sides of the two limbs 88, 90 and which are thus visible to a user and of which one is red 82 and the other is green 94 and which, being likewise connected through the microcontroller 86 to the controller 68, are also controlled by using the controller 68.

[0149] An—illuminated—green LED (light-emitting diode) 94 indicates a thermal state of a shrink chuck 4 that has for example cooled to such an extent that it can be safely touched using a bare hand; an—illuminated—red LED (light-emitting diode) 82 indicates a thermal state of a shrink chuck 4 that has not yet (sufficiently) cooled down. Red flashing of the red LED (light-emitting diode) 82 indicates an active cooling operation by using the cooling arrangement 12.

[0150] Even though the invention has been illustrated and described in more detail by way of the preferred exemplary embodiments, the invention is not restricted by the disclosed examples, and other variations may be derived from them without departing from the scope of protection of the invention.

[0151] The following is a summary list of reference numerals and the corresponding structure used in the above description of the invention: [0152] 2 Appliance for a heat treatment, shrinkage appliance, cooling appliance, shrinkage appliance with cooling appliance [0153] 4 Shrink chuck [0154] 6 Shaft-type/rotary tool, miller/milling tool [0155] 8 Receiving device, receiving opening [0156] 10 Central axis, coil axis [0157] 12 Heat treatment unit, induction coil arrangement, cooling appliance/unit [0158] 14 Measuring unit [0159] 16, 16′ Temperature sensor, pyrometer with radiation detector, radiation detector [0160] 18 (Coil) housing [0161] 20 Recesses [0162] 22 Measurement channel [0163] 24 Coil winding [0164] 26 Through recess [0165] 28 Control unit [0166] 30 Quotient pyrometer [0167] 32 Sleeve section [0168] 34 Clamping region [0169] 36 Face opening [0170] 38 Front face end [0171] 40 Tool shaft, miller shaft [0172] 42 Front working section [0173] 44 Axial central region [0174] 46 Coil-side inner section [0175] 48 Outer wall [0176] 50 Induction coil housing [0177] 52 Cable [0178] 54 Focusing device, shielding device, aperture [0179] 56 (Annular) structural unit, measuring/sensor ring [0180] 58 Central axis of the (annular) structural unit/measuring ring [0181] 60 Sensor [0182] 62 Second sensor of different type, distance sensor, optical (distance) sensor, ultrasound sensor, laser sensor, (infrared) reflection sensor [0183] 64 Display device, (LED) (heat) status indicator [0184] 66 Processing unit [0185] 68 Controller, control unit [0186] 70 Stand [0187] 72 Cooling head [0188] 74 Cooling attachment [0189] 76 (Measuring ring) housing [0190] 78 Transmitter [0191] 80 Receiver [0192] 82 (Red) light-emitting diode [0193] 84 Feed line [0194] 86 Microcontroller [0195] 88 (Left) limb [0196] 90 (Right) limb [0197] 92 Passage, recess [0198] 94 (Green) light-emitting diode [0199] 96 (Ultrasound) distance sensor [0200] 98 Reflection sensor [0201] 100 Method [0202] 120 Heat treatment, heating, shrinkage-based insertion/removal, cooling [0203] 140 Ascertainment of a resulting shell/surface temperature [0204] 160 Control of the heat treatment, control of the heating/of the cooling, control of the heating power or the electrical current supply [0205] 180 Performing of calibration/setting or adjustment at at least one (first) temperature sensor (16) using the second sensor (62) of different type, interaction of the at least one (first) temperature sensor (16) with the second sensor (62) of different type [0206] 200 Interaction of a first second sensor (62) of different type with a second second sensor (62) of different type [0207] 220 Detection of a shrink chuck (4) received in the receiving device (8) using a second sensor of different type