DEVICE FOR HEAT TREATMENT

Description

[0001] The invention relates to a device for heat-treating, in particular inductively heating or cooling, shrink-fit chucks for shank tools, specifically a shrink-fit device or a cooling device or a shrink-fit device with a cooling device (for shrink-fit chucks). The invention further relates to a method for operating such a device.

[0002] Such a device for the heat treatment of shrink-fit inserts, in this case a shrink-fit device, is known from DE 10 2012 216 186 A1. This shrink-fit device includes a sensor-based temperature measuring device, here a radiation / IR thermometer, which detects the shell temperature or surface temperature of a shrink-fit insert without contact and is positioned at a distance from the shrink-fit device. However, for temperature measurement, an induction coil arrangement of the shrink-fit device must be moved out of reach of the shrink-fit insert so that the surface of the shrink-fit insert can be scanned by the sensor. Temperature measurement during a heating process is therefore not possible.

[0003] An improvement in this regard is provided by another such shrink-fit device with an induction coil arrangement and a non-contact temperature measuring sensor, which is known from DE 10 2018 121 883 A1. In this shrink-fit device, the induction coil arrangement is provided with a measuring channel that leads into a receiving opening for a shrink-fit insert. Furthermore, the shrink-fit device provides that the non-contact temperature measuring sensor has a temperature sensor, in this case also a radiation thermometer, for measuring the outer temperature of the shrink-fit insert, which engages in this measuring channel.

[0004] From EP 2 116 104 B1, another such shrinking device with an induction coil arrangement and with a non-contact sensory temperature measuring device is known, wherein in this case two non-contact sensory temperature sensors, namely two infrared temperature sensors, are provided in the non-contact sensory temperature measuring device.

[0005] The radiation thermometers used here in the aforementioned state of the art (for non-contact temperature measurement of the shrink linings) operate on the basis of infrared radiation / heat radiation emitted by the body (such as the infrared radiation / heat radiation emitted here by a shrink lining).

[0006] Every body or object emits an amount of infrared radiation, or thermal radiation, corresponding to its surface temperature (which is detected and evaluated using a radiation thermometer). The intensity of the infrared / thermal radiation changes depending on the object's temperature.

[0007] Furthermore, the intensity of infrared / thermal radiation from "real bodies" is also dependent on the material and / or surface. This means that (real) bodies emit an intensity lower by a material / surface-dependent factor than ideal thermal radiators, i.e., ideal "black bodies". This factor is known as the "emissivity ε".

[0008] For non-contact temperature measurement, if one wants to measure the temperature of individual bodies exactly, one must know the (individual) emissivity ε, i.e. the heat radiation capacity, of the respective body.

[0009] This proves to be a disadvantage in the known shrinking devices with the radiation thermometer used there, where the temperature is to be measured on (many different) real bodies, i.e. the shrinking inserts, - with emissivities ε that are unknown in practice.

[0010] Therefore, the radiation thermometer used is usually preset (or calibrated) to a specific emissivity ε. This means that an exact temperature measurement can only be taken for a very specific object made of a very specific material / surface (namely, the object whose material / surface has exactly the preset emissivity ε), which leads to measurement errors for all other objects (or shrink-wrap inserts) to be measured – with different emissivities ε.

[0011] The object of the invention is to improve the shrinking devices known in the prior art, generally known devices for the heat treatment of shrink-fit chucks, with regard to their temperature measurement of the shrink-fit chucks to be treated, and (thereby) to ensure reliable heat treatment, in particular heating or cooling of shrink-fit chucks, with high safety and ease of use.

[0012] This problem is solved by a device for heat treatment, in particular inductive heating or cooling, of shrink-fit chucks, and a method for operating such a device with the features of the respective independent claim.

[0013] Advantageous further developments of the invention are the subject of dependent claims and the following description - and relate to both the device(s) and the method.

[0014] Terms such as top, bottom, front, back, left, or right are to be understood according to common usage unless explicitly defined otherwise. Terms such as radial and axial are to be understood in relation to a central axis of the device.

[0015] The term "essentially" – insofar as it is used – can (according to the highest court's understanding) be interpreted as referring to "a practically still considerable degree." Any deviations from the exact, thus implied by this terminology, can arise unintentionally (i.e., without functional justification) due to manufacturing or assembly tolerances, or similar factors.

[0016] The device for heat treatment, in particular inductive heating or cooling, of shrink-fit chucks for shank tools, in particular a shrink-fit device or a cooling device or a shrink-fit device with a cooling device (for shrink-fit chucks), comprises a receiving device, in particular a receiving opening, for receiving the shrink-fit chuck, forming a receiving area for a shrink-fit chuck, a heat treatment unit, in particular an induction coil arrangement or a cooling unit, enclosing the receiving device or the receiving area with respect to a central axis, in particular concentrically, and a measuring unit for measuring the temperature of the shrink-fit chuck, in particular without contact.

[0017] Such a temperature measuring unit, preferably one that measures without contact, can, for example, be a measuring unit based on (thermal) radiation measurement of bodies. That is, such a temperature measuring unit, preferably one that measures without contact, can, for example, include a radiation sensor, such as in a pyrometer.

[0018] Furthermore, the device according to the invention provides that the measuring unit has several temperature sensors arranged around the receiving device or the receiving area - or at least one temperature sensor arranged around the receiving device or receiving area and inclined with respect to the central axis for detecting, in particular without contact, a jacket temperature or surface temperature of a shrink sleeve arranged in the receiving device / in the receiving area, for example a radiation sensor or radiation sensors or a pyrometer with a radiation sensor or pyrometer with radiation sensors.

[0019] In other words, it is advantageous if the multiple temperature sensors and / or the inclined temperature sensor are each designed as a radiation detector, in particular as a pyrometer with a radiation detector for detecting thermal radiation from a shrink-fit lining arranged in the receiving device.

[0020] The at least one tilted temperature sensor can also be one of several temperature sensors arranged around the recording device or recording area.

[0021] Preferably, the tilt angle of the tilted temperature sensor is between 30° and 60°, in particular 45°.

[0022] By tilting the sensor, the surface can be better detected by an emissivity ε, especially in an area where one wants to measure and / or monitor the surface temperature, for example in the range of 50°C - 70°C.

[0023] Furthermore, by tilting the temperature sensor, a larger detectable area that can be monitored by the temperature sensor can be achieved.

[0024] In particular, it may also be advantageous if at least one of the several temperature sensors and / or the inclined temperature sensor provides a focusing device and / or a shielding device, in particular an aperture.

[0025] This, or such a focusing device and / or shielding device, can make the temperature sensor less sensitive to interference radiation. e.g. from a heat-emitting device located close to the temperature sensor, for example a heat shrink machine. Additional shielding for the temperature sensor may therefore be unnecessary.

[0026] Preferably, it can then be further provided that at least two, in particular many or even all, of these multiple temperature sensors are used together for measuring the jacket temperature or surface temperature of a shrink-fit lining arranged in the receiving device / in the receiving area.

[0027] "Used" can mean, in particular, that a resulting shell temperature or surface temperature is determined using at least two, especially many or even all, temperature sensors and their measurements / values. A first, simplest approach in this regard could be to determine the average of the at least two, especially many or even all, temperature sensors and their measurements / values ​​as the resulting shell temperature. The individual temperature sensors and their measurements / values ​​can also be weighted individually in this process.

[0028] Furthermore, it is also stipulated that at least two, in particular many or even all, of the temperature sensors must have different configurations / measurement settings.

[0029] "Different configurations / measurement settings" (for the temperature sensors) means that the temperature sensors are calibrated differently, for example, for / on different materials / surfaces of shrink-fit linings (or different emissivities ε). It can also mean that the temperature sensors have measuring ranges in different wavelength ranges (cf. ratio pyrometer).

[0030] Alternatively, the device according to the invention also provides that the measuring unit has several sensors arranged around the receiving device or the receiving area, wherein at least one first of these is a temperature sensor for detecting, in particular non-contact, a jacket temperature of a shrink sleeve arranged in the receiving device / in the receiving area, for example a radiation sensor or a pyrometer with radiation sensor (see above), and at least one second of these is a different type of sensor for detecting another property of the shrink sleeve arranged in the receiving device / in the receiving area.

[0031] In this case, at least one tilted sensor can also be at least one first temperature sensor, which is combined with at least one second different type of sensor.

[0032] The first temperature sensor, at least, may also have a focusing device and / or a shielding device.

[0033] Preferably, the at least one second different type of sensor can be a distance sensor or reflection sensor, in particular a non-contact measuring sensor, especially an optical sensor or an ultrasonic sensor or a laser sensor or an infrared (reflection) sensor.

[0034] Distance sensors, also known as position sensors, displacement sensors, displacement transducers, or distance sensors, measure the distance between the sensor and an object. These sensors can measure quantities such as distance, displacement, and position. The change in distance is converted by the sensor or a sensor controller into an electrical signal, which can then be output to a control unit, possibly via various interfaces.

[0035] A reflection sensor is used to check the presence or absence of an object by measuring the light reflection from the object.

[0036] Temperature measurement can be improved by arranging several of the first temperature sensor and / or several of the second, different type of sensor around the recording device / area. These second, different type of sensor can also be of different types from each other, for example, a distance sensor combined with a reflection sensor.

[0037] Furthermore, it can also be provided that - in the case of several of the first temperature sensors - at least two, in particular many or even all, of the first temperature sensors have different configurations / measurement settings.

[0038] The signal from one and the same radiation sensor can be evaluated in different ways - as an alternative to the case of multiple radiation sensors - e.g. based on different emissivities ε, instead of using several temperature sensors with different configurations / measurement settings.

[0039] Preferably, it can also be further provided that at least the at least one first temperature sensor and the at least one second different type of sensor, in particular - in the case of several of these - several, many or even all of this first temperature sensor and this second different type of sensor are used for measuring the jacket temperature or surface temperature of a shrink-fit lining arranged in the receiving device / in the receiving area.

[0040] Further options include arranging the sensors in a circular pattern (possibly in groups on different circles) around the central axis and / or at different axial heights relative to the central axis at or around the recording device / recording area. This can be implemented with uniform or uneven spacing.

[0041] It may also be provided that each sensor is individually attached to its predetermined position, for example in or on the heat treatment unit - or on a housing thereof, - or that a common holding device, such as a ring-shaped assembly (measuring ring) that at least partially encloses the receiving device / receiving area, is provided, which receives the sensors - and which is then itself installed in the device or in or on the heat treatment unit / housing.

[0042] Preferably, the essentially ring-shaped component or measuring ring can be arranged coaxially to the central axis of the device, in particular axially adjacent to the heat treatment unit, especially the induction coil arrangement or the cooling unit.

[0043] It can also be advantageous to arrange similar sensors adjacent to each other within the essentially ring-shaped assembly, for example, "bundled" in (circular) sectors. Thus, for instance, the temperature sensors can be arranged adjacent to each other in a circular sector of the essentially ring-shaped assembly or measuring ring.

[0044] It can also be further specified that the heat treatment unit has at least one or more interruptions, for example radial (measuring) channels leading into the receiving area formed by the receiving unit, or is permeated by such channels.

[0045] In the case of an induction coil arrangement as a heat treatment unit, it can be particularly advantageous if a coil winding of the induction coil arrangement is wound around the channels - while keeping the respective interruption or the respective channel clear.

[0046] In such a (measuring) channel, or at least partially in such a measuring channel and / or on such a (measuring) channel, a sensor, such as a temperature sensor, can then be arranged or used - in such a way that it measures through the measuring channel.

[0047] Furthermore, if the sensor is also located outside the housing of the heat treatment unit, it is advisable for the housing to provide a corresponding opening for the sensor (for measuring through the sensor).

[0048] In particular, from a metrological perspective, it is advantageous if such a measuring channel runs essentially radially to the central axis through the heat treatment unit and / or its housing.

[0049] Further development may also provide for such a measuring channel to be arranged in an axial central area of ​​the induction coil arrangement, preferably approximately in the middle between its axial ends.

[0050] Furthermore, it proves advantageous to insert a protective window, preferably replaceable and permeable to heat radiation, into such a measuring channel, particularly to protect the sensor from contamination and / or damage.

[0051] Alternatively or additionally, in addition to the wound (measuring) channels, it can also be provided that – in the case of an induction coil arrangement as a heat treatment unit – the induction coil arrangement has two or more spaced-apart sub-coils, with one or more sensors – corresponding to the channel arrangement – ​​being arranged at the intervals between the sub-coils (and able to measure through them). A similar arrangement can also be provided for a cooling unit – with sub-units as a heat treatment unit.

[0052] Furthermore, the transmission of measured values ​​from the temperature sensors to a computing and / or control unit can be wired or wireless.

[0053] It is advantageous, especially for non-contact temperature measurement, if the several temperature sensors are designed as non-contact measuring radiation detectors / sensors or as pyrometers with a radiation detector / sensor (for detecting thermal radiation from a shrink-fit insert arranged in the receiving opening).

[0054] Preferably, the device may also include a calculation unit for determining the resulting jacket temperature of a shrink-fit chuck arranged in the receiving device / receiving area, which is configured in such a way that the resulting jacket temperature can be determined using the sensors, in particular using jacket temperatures of the shrink-fit chuck arranged in the receiving device detected by several temperature sensors.

[0055] It is also advantageous if the device is equipped with a control unit. This control unit can, in particular, serve to control the heat treatment unit, such as the induction coil assembly or the cooling unit, for example, by controlling the power output of the heat treatment unit, such as the current supply to the induction coil assembly, depending on the jacket temperature determined using the sensors.

[0056] Furthermore, it can also be advantageous if the device has a display device to indicate a thermal state, in particular of a tool holder arranged in the receiving device / in the receiving area, especially a shrink-fit chuck. This could be, for example, color LEDs. Different colors can indicate different thermal states.

[0057] The invention is based on the idea – starting from the problem of different and unknown emissivities ε in a plurality of shrink-fit inserts intended for “temperature measurement” – that the influence of the emissivity ε (which depends on the material and / or surface of a respective shrink-fit insert) can be eliminated or factored out (e.g., mathematically simplified) when using or measuring temperature with multiple sensors, in particular multiple temperature sensors or different sensors – and thus the temperature measurement becomes independent of the respective emissivity ε or its knowledge is no longer necessary.

[0058] With a single (radiation) sensor for temperature measurement, knowledge of the specific emissivity ε of the respective shrink-fit insert would be necessary (for precise temperature measurement / determination) – and the (radiation) sensor would have to be individually adjusted for this emissivity ε, or the (radiation) sensor would have to be individually calibrated for the respective shrink-fit insert. This is eliminated with the invention using multiple temperature sensors.

[0059] This finding is also utilized by an alternative device according to the invention - for heat treatment, in particular inductive heating or cooling, of shrink-fit chucks for shank tools, in particular a shrink-fit device or a cooling device or a shrink-fit device with a cooling device, with a receiving device forming a receiving area, in particular a receiving opening, for receiving a shrink-fit chuck, a heat treatment unit surrounding the receiving device with respect to a central axis, in particular concentrically, in particular an induction coil arrangement or a cooling unit, and a measuring unit for, in particular non-contact, temperature measurement of the shrink-fit chuck, which provides that the measuring unit has a ratio pyrometer.

[0060] Ratio pyrometers (also called two-color or ratio pyrometers) use two (radiation) detectors, both operating at different - but usually closely spaced - wavelengths, and aimed at the same target.

[0061] Ratio pyrometers are used because, when two radiation densities of different wavelengths—measured from a single body—are "ratiod" to a quotient Q, the emissivity ε cancels out (i.e., it can be simplified), leaving only a temperature-dependent expression. This dependence can be obtained, for example, from calibration using a blackbody. Therefore, temperatures can be measured without knowing the emissivity ε.

[0062] Preferably, the quotient pyrometer can also be designed with all the features described above, in particular insofar as they relate to temperature sensors and / or can be combined with such features.

[0063] In particular, it can also be provided here that the heat treatment unit has a measuring channel - with all the aforementioned further developmental features, - in which or on which the quotient pyrometer is arranged - and through which the quotient pyrometer measures.

[0064] The essentially ring-shaped component or measuring ring can also be equipped with the quotient pyrometer.

[0065] In the method for operating a device according to the invention, in particular for inductively heating or cooling a shrink chuck, a resulting shell temperature of a shrink chuck arranged in the receiving opening or in the receiving area is then determined using the multiple sensors, in particular using shell temperatures of the shrink chuck arranged in the receiving opening / receiving area detected by the multiple temperature sensors.

[0066] This can happen, for example, if the temperature sensors have different configurations / measurement settings, such as being calibrated differently, for example for / on different materials / surfaces of shrink liners (or different emissivities ε), or if the temperature sensors have measuring ranges in different wavelength ranges (cf. ratio pyrometer), and then the resulting jacket temperature is determined from the measurements / values ​​obtained by the several temperature sensors.

[0067] In other words, it may be provided that different calibrations / settings, in particular different emissivities ε, are set for several temperature sensors, and that measurements from the several temperature sensors are compared and / or processed together, and the resulting jacket temperature is determined from this.

[0068] Mathematically, it can be particularly advantageous that - if one compares the measurements of the several temperature sensors - the emissivity ε can be eliminated.

[0069] This can also happen, for example, by using a measurement of the different type of second sensor to perform a calibration / setting or adjustment on at least one temperature sensor, or by using a measurement of the different type of second sensor to determine how the resulting jacket temperature is determined, in particular from the measurements of several temperature sensors.

[0070] For example, this could be achieved by using a reflection sensor, corrected by the measurement from a distance sensor, to determine the surface color of the shrink lining through reflection measurement. Depending on this, (a) presets can then be made for the temperature sensor(s) and measurements taken with that sensor, or (b) the measurements from several preset temperature sensors can be processed accordingly.

[0071] However, it was also surprisingly observed that the emission behavior within narrow temperature limits and in certain frequency ranges shows only minor differences for various surface finishes. This makes it possible to measure the temperature within these temperature limits with sufficient accuracy using a single suitable sensor, such as a temperature sensor or a pyrometer, especially a single, angled sensor operating in a favorable frequency range, regardless of the surface finish of the shrink-fit lining.

[0072] Preferably, the operation of the shrink-fit device can consist of inductively heating and thereby expanding a shrink-fit chuck within the receiving device enclosed by a heat treatment unit designed as an induction coil arrangement, and controlling the heating process using the resulting jacket temperature. Alternatively, a shrink-fit chuck can be cooled within the receiving device enclosed by a heat treatment unit designed as a cooling unit, and controlling the cooling process using the resulting jacket temperature.

[0073] This control can be achieved, for example, by changing or adjusting and / or controlling the power supply to the heat treatment unit depending on the resulting jacket temperature.

[0074] The preceding description of advantageous embodiments of the invention contains numerous features, some of which are summarized in the individual subclaims. However, these features can also be expediently considered individually and combined into meaningful further combinations.

[0075] Even though some terms in the description or in the patent claims are used in the singular or in conjunction with a numeral, the scope of the invention for these terms is not to be limited to the singular or the respective numeral. Furthermore, the words "ein" and "eine" are not to be understood as numerals, but as indefinite articles.

[0076] The properties, features and advantages of the invention described above, as well as the manner in which these are achieved, become clearer and more easily understood in connection with the following description of the embodiments of the invention, which are explained in more detail in connection with the drawing(s) / figures (identical parts / components and functions have the same reference numerals in the drawings / figures).

[0077] The exemplary embodiments serve to illustrate the invention and do not limit the invention to the combinations of features specified therein, including functional features. Furthermore, suitable features of each exemplary embodiment can also be explicitly considered in isolation, removed from one exemplary embodiment, incorporated into another exemplary embodiment to supplement it, and combined with any one of the claims.

[0078] They show: FIG 1 a shrink-wrapping device with an induction coil arrangement equipped with several non-contact temperature sensors according to one embodiment; FIG 2 the induction coil arrangement of the shrink-wrapping device according to FIG 1 in perspective view; FIG 3 a radial section through the induction coil arrangement of the shrink device according to FIG 1 ; FIG 4 an axial section through the induction coil arrangement of the shrinking device according to FIG 1 FIG 5 a shrink device with cooling unit and with measuring ring integrated into the cooling unit according to one embodiment in perspective view; FIG 6 the shrink device with cooling unit and with the measuring ring integrated into the cooling unit according to FIG 5 in side view; FIG 7 the measuring ring of the shrink device according to FIG 5 in perspective view; FIG 8 a schematic representation of the functioning of the measuring ring of the shrink device according to FIG 5 ; FIGen 9, 9bein further measuring ring in two representations. - Shrink-fit device with non-contact temperature measurement (FIGen 1 to 4)

[0079] FIG 1 Figure 2 shows a shrink-fit device 2 for shrinking 120 of shank tools 6 or (shown) of a milling tool 6 into or out of a shrink-fit chuck 4 with an induction coil arrangement 12 equipped with several non-contact measuring temperature sensors 16.

[0080] FIGS. 2 to 4 show the induction coil arrangement 12 in various views / sections in detail.

[0081] The shrinking device 4 shows how FIG 1 Figure 12 shows the induction coil arrangement 12, which is movable along its coil axis 10, for inductive heating 120 of the shrink-fit chuck 4 (see especially Figures 2 to 4) and a (schematically depicted) control unit 28 for process or heating control 160 of the shrink-fit chuck 4.

[0082] The - in this case in FIG 1The shrink-fit chuck 4, as shown, comprises a cylindrically hollow clamping area 34 as a sleeve section 32, which is accessible via an end opening 36 at the front end 38 of the shrink-fit chuck 4 for the insertion of the tool or milling cutter shank 40.

[0083] The clamping area 34 of the shrink-fit chuck 4 has a slightly smaller nominal diameter than the tool shank 40, so that the latter can be clamped in a manner known per se by (inductive) heating 120 of the shrink-fit chuck 4. In the shrunk-in state, the tool or milling cutter shank 40 is held in a friction-fit, rotationally fixed press fit to transmit torque to the front working section 42 of the rotary tool 6.

[0084] For shrinking, only the shrink chuck 4 is heated on one side to 120°C until the thermal expansion releases the tool or milling cutter shank 40 for removal.

[0085] The induction coil arrangement 12 encloses - as shown in FIGS. 1 to 4 - concentrically around its coil axis 10 - a receiving opening 8 for the shrink-fit chuck 4.

[0086] By axially displacing the induction coil assembly 12 - along its coil axis 10 - the shrink-fit chuck 4 - in relation to the induction coil assembly 12 - is brought into the desired heating position (see figure). FIG 1 ). Stop elements, such as a pole disc, may also be provided on the induction coil assembly.

[0087] To generate an alternating electromagnetic field, the induction coil arrangement 12 contains, as can be seen in particular from FIGS. 1, 3 and 4, a coil winding 24 in a coil housing 18.

[0088] In order to be able to detect the jacket temperature of the shrink-fit lining 4 when heated 120, the induction coil arrangement 12 is radially perforated with respect to the coil axis 10 by several, in this case six, measuring channels 22 which open into the receiving opening 8.

[0089] The six measuring channels 22, as shown in FIGS. 3 and 4, are arranged at approximately equal intervals around the coil axis 10 and 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 its axial ends – with the coil winding 24 being wound around the six measuring channels 22, keeping them clear. The coil-side inner section 46 of each measuring channel 22 is aligned with an opening 26 in the outer wall 48 of the induction coil housing 50 (there are a total of six openings in the outer wall 48 of the induction coil housing 50).

[0090] In each of the six openings 26 of the induction coil housing 50, a non-contact measuring temperature sensor 16, here a (non-contact) thermal radiation measuring radiation detector 16 or pyrometer 16, is inserted, which detects thermal radiation emitted by the shrink sleeve 4 through "its respective" measuring channel 22 in the coil winding 24.

[0091] The control unit 28 is coupled to the temperature sensors 16 via cables 52 on the input side – and thus contains their measurement signals, which are processed together in the control unit 28 to determine a resulting shell / surface temperature of the shrink-fit chuck 4 to be measured 140. According to a first and simple approach, this is done, for example, by averaging. If, for example, the determined resulting shell / surface temperature of the shrink-fit chuck to be measured exceeds a predetermined target temperature, the heating power of the induction coil arrangement is reduced 160.

[0092] This allows temperature control to be carried out during the heating of the shrink-fit lining 4 - based on the determined resulting shell temperature - for example in the form that - by means of a control unit 28 - the current supply to the induction coil arrangement is influenced as a function of the resulting shell temperature 160. - Shrinking device with non-contact temperature measurement using a ratio pyrometer (see FIGS. 1 to 4)

[0093] FIGS. 1 to 4 also show - indicated as a modification by the reference numeral 30 (in brackets), "quotient pyrometer", - an alternative shrinking device 2 for shrinking in or out 120 of shank tools 6 or (shown) of a milling tool 6 into or out of a shrink chuck 4 - with in this modified case - an induction coil arrangement 12 equipped with a quotient pyrometer 30.

[0094] This embodiment of the alternative shrinking device differs from the previous embodiment, as shown in FIGS. 1 to 4, solely in that – instead of the six temperature sensors / radiation detectors 16 located in / on or measuring through the six measuring channels 22 – a single ratio pyrometer 30 is used, arranged accordingly in / on one of the measuring channels 22. The resulting shell / surface temperature is thus obtained solely from the measurement by the ratio pyrometer 30.

[0095] All previous explanations regarding the shrinking device 2 are relevant here and do not need to be repeated. - Shrink-wrapping device with cooling unit and non-contact temperature measurement (FIGen 5 to 8)

[0096] FIGS. 5 and 6 show a shrinking device 2 with a cooling device 12, as shown and described in detail in EP 3 444 064 A1 (see FIGS. 1 and 4 and

[0014] to

[0026] of EP 3 444 064 A1), the contents of which are hereby incorporated into this application (reference document).

[0097] How FIG 5 (see also) FIG 4 the EP 3 444 064 A1 (reference document)) and FIG 6 (see also) FIG 1 As shown in EP 3 444 064 A1 (reference document), the cooling unit 12 has a cooling head 72 slidably guided on a frame or stand 70, which includes a cooling attachment 74 that can be placed on at least the part of the shrink-fit chuck 4 to be cooled. The cooling attachment 74 has a receiving opening 8 (cf. through-opening 6 in EP 3 444 064 A1), the inner contour / diameter of which is matched to the outer contour / diameter of the part of the shrink-fit chuck 4 to be cooled (not shown) (so that the cooling attachment 74 can be slid / placed onto a shrink-fit chuck 4 to be cooled).

[0098] For further details on the shrinking device 2 and its cooling device 12, reference is made to EP 3 444 064 A1 (see FIGs. 1 and 4 and

[0014] to

[0026] of EP 3 444 064 A1).

[0099] As FIGS. 5 and 6 further show, a measuring or sensor ring 56 (open over a certain circular ring sector) is incorporated into the cooling attachment 74 (cf. FIG 7 (An alternative sensor ring is shown in FIGS. 9a and 9b)) is integrated, by means of which the jacket temperature of a shrink-fit insert 4 held in the cooling attachment 74 or its receiving opening 8 can be measured – without contact. It is integrated in such a way that the measuring ring 56 (see FIGS. 9a and 9b) is located at the lower edge of the cooling attachment 74. FIG 7 ) - is arranged coaxially (with its central axis 58) to the central axis 10 of the cooling head 72 or cooling attachment 74.

[0100] The inner diameter of the measuring ring 56 is essentially the same as that of the cooling attachment 74 (at its lower end), which thus becomes part of the receiving opening 8.

[0101] FIG 7 shows the measuring ring 56 - in a "top" cut-open state, which allows a view into a housing 76 of the measuring ring 56, - ​​in detail.

[0102] How Fig. 7 To clarify, the measuring ring 56 is an almost closed ring-shaped body - with two ring arms 88, 90 opposite each other at its open sector.

[0103] How FIG 7 As also shown, the measuring ring housing 76, which forms the body of the measuring ring 56, incorporates several different types of sensors 60, 16, 62, 96, 98, namely three infrared temperature sensors 16 arranged side by side - in a left leg 88 of the figuratively shown in Fig. 7 The measuring ring 56 shown comprises an ultrasonic distance sensor 60, 62, 96, a transmitter 78 and a receiver 80, as well as a reflection sensor 60, 62, 98 - in a right leg 90 of the figuratively shown in Fig. 7 shown measuring ring 56.

[0104] All these sensors 60, 16, 62, 96, 98 are mounted in the measuring ring 56 or its housing 76 in such a way that their respective measuring direction is radially aligned with the central axis 58, 10. For this purpose, the measuring ring housing 76 also provides radially internal passages or openings 92, through which the sensors 60, 16, 62, 96, 98 can measure radially inwards.

[0105] In an embodiment not shown, the sensors 60, 16, 62, 96, 98 can also be oriented essentially perpendicular to the outer shell of the shrink-fit liner 4, which in many cases is conically shaped.

[0106] The sensors 60, 16, 62, 96, 98 are connected via lines (not shown) to a microcontroller 86 (calculation unit 66) also housed in the measuring ring 56 or in its housing 76, so that measurement signals from the sensors 60, 16, 62, 96, 98 are supplied to it for processing, in particular for determining a resulting jacket temperature of a shrink sleeve 4 140 housed in the cooling attachment 74.

[0107] The microcontroller 86, in turn, is connected via a supply line 84 to a control unit 68, or more simply, to a controller 68, of the cooling device 12, to which it transmits its signals, such as the resulting jacket temperature. Depending on the currently determined jacket temperatures, the controller 68 can then control a cooling process 120 (with a shrink-fit insert 4 housed in the cooling attachment 74) 160.

[0108] How Fig. 7As also shown, the measuring ring 56 provides an LED (heat) status indicator 64 in the form of two colored LEDs 82, 94 arranged on the end faces of the two legs 88, 90 and thus visible to a user, one of which is red 82, the other green 94 - and which - also connected to the control unit 68 via the microcontroller 86 - are also controlled via the control unit 68.

[0109] A lit green LED 94 indicates a heat state of a shrink sleeve 4 that has cooled down sufficiently to be safely touched by hand; a lit red LED 82 indicates a heat state of a shrink sleeve 4 that has not yet cooled down (sufficiently). A flashing red LED 82 indicates active cooling by the cooling system 12.

[0110] Fig. 8illustrates the functionality 100 or the interaction 200 of the various sensors 60, 16, 62, 96, 98 - in their measurements or in determining the jacket / surface temperature of a shrink-fit chuck 4 140 and control 160 which is to be cooled by cooling or which is included in the cooling attachment 74.

[0111] The measuring ring 56 and its sensors 60, 16, 62, 96, 98 (and LEDs 82, 94) are active or are activated (1) as soon as the cooling attachment 74 - with integrated measuring ring 56 - is moved downwards from above over the shrink-fit chuck 4 to be cooled, (2) during the cooling process 120, in which the shrink-fit chuck 4 is held in the cooling attachment 74 (and is cooled, controlled by the controller 68 (Note: the controller 68 sets the cooling parameters, such as cooling duration, etc., possibly using the determined surface temperature or surface color of a shrink-fit chuck 4)) and (3) until the cooling attachment 74 with integrated measuring ring 56 is completely lifted from the shrink-fit chuck 4 (referred to, for example, as the "measuring phase" / "measuring cycle").

[0112] The beginning and end of the measurements or the measurement phase ((1) to (3)) can be determined (automatically) by means of the (ultrasonic) distance sensor 62, 96 or 78 / 80, which - by measuring distance - detects whether a shrink sleeve 4 is located in the measuring ring 56 220.

[0113] During the temperature measurement or determination 140 (which is carried out by the microcontroller 86), the surface or surface color of the shrink sleeve 4 held in the measuring ring 56 is determined using the reflection sensor 62, 98 – based on the distance values ​​determined by the distance sensor 62, 96, 78, 80 (200). Specifically, this determines whether the shrink sleeve 4 has a black surface or not.

[0114] Based on this information, those infrared temperature sensors 16 - from the three infrared temperature sensors 16 included in the measuring ring 56 - are selected for temperature determination / calculation 140 180 which are (pre-)set / calibrated to the present surface of the shrink-fit lining 4 ("black" / "not black" or "silver", "white") included in the measuring ring 56 (currently) (200).

[0115] In the measuring ring 56, one of the three infrared temperature sensors 16 is set / calibrated to a black surface ("black temperature sensor"), whereas the other two infrared temperature sensors 16 are set / calibrated to non-black surfaces, for example silver and white ("non-black temperature sensors").

[0116] If a "black" shrink sleeve 4 is detected in the measuring ring 56 by means of the reflection sensor 62, 98, the temperature 140 is determined using one "black" infrared temperature sensor 16; if a "non-black" shrink sleeve 4 is detected in the measuring ring 56, the temperature 140 is determined using the two other "non-black" temperature sensors 16, for example by averaging the values ​​of the two "non-black" temperature sensors 16, 16.

[0117] Based on the surface / shell temperatures thus determined of a shrink sleeve 4 located in the measuring ring 56, the cooling 120 is then controlled 160, as are the LED (heat) status indicator LEDs 82, 94 and 64 respectively, according to the determined surface / shell temperatures 160.

[0118] In particular, the LED control may be designed such that (1) the cooling attachment 74 with the measuring ring 56 is first pushed over the (hot) shrink sleeve 4 to be cooled, the red LED 82 - glowing red - indicates the hot state of the shrink sleeve 4 or its surface / shell.

[0119] Once the cooling attachment 74 is completely pushed over the shrink sleeve 4 - and the cooling process 120 is started (2), the red LED 82 flashes - during the cooling process 120 - and indicates that "cooling" 120 is taking place.

[0120] Once the cooling process 120 is complete and the cooling attachment 74 is raised (3), the red LED 82 illuminates if the shrink-fit insert 4 is still too hot, and the green LED 94 illuminates if the shrink-fit insert 4 has cooled down sufficiently. If the red LED 82 indicates that the shrink-fit insert 4 is still too hot, the cooling attachment 74 can be slid back down over the shrink-fit insert 4, and another cooling process 120 can be carried out.

[0121] If necessary, the entire cooling process 120 can be automatically linked to the temperature measurement 140 and controlled via that 160.

[0122] Furthermore, it would also be possible not to select the (preset) infrared temperature sensors 16 based on the reflection measurement (98) first, but rather to configure one or more of the infrared temperature sensors 16 based on a current reflection measurement (98). The infrared temperature sensor(s) 16 configured in this way can then be used to determine the temperature 140 of the shell / surface temperature of the shrink liner 4. If necessary, a "correction" of the reflection measurement (98) using the distance sensor (96, 78, 80) can also be omitted.

[0123] It is also noted that a measuring ring 56 corresponding to the previously described measuring ring 56 can also be arranged on an induction coil assembly 12 of a shrink-wrapping device 2 in order to measure the jacket temperatures of shrink-wrapping chucks 4 received in the receiving opening 8 of the induction coil assembly 12 (see FIGS. 1 to 4). Similarly, a measuring ring 56 corresponding to the previously described measuring ring 56 can also be arranged on independent or self-operating, separate cooling devices 12.

[0124] FIGS. 9a and b show an alternative measuring ring 56 (which can be used or is used in the same way in its function) that can be integrated into the cooling attachment 74 - with FIG 9a this in an overall view and with FIG 9b a detailed section of this cut-open state "from above".

[0125] How Fig. 9aTo clarify, this measuring ring 56 is also an almost closed ring-shaped body - with two ring arms 88, 90 opposite each other at its open sector.

[0126] How FIG 9a (and FIG 9b) (in detail) also shows that a single temperature sensor 60 is incorporated in the measuring ring housing 76 forming the body of the measuring ring 56, namely an infrared temperature sensor 16' - in a left leg 88 of the figuratively in Fig. 9a shown measuring ring 56.

[0127] Notwithstanding the above, other holding devices besides the measuring ring 56 for the temperature sensor 16' may also be provided.

[0128] The temperature sensor 60 or 16' is equipped with an aperture of 54.

[0129] Unlike the previously described measuring ring 56 (according to FIG 7 ) this temperature sensor 60 or 16' is here - inclined to the central axis 10 by an angle α of approx. 45° - in the measuring ring housing 76.

[0130] The temperature sensor 60 or 16' is connected via lines (not shown) to a microcontroller 86 (calculation unit 66, not visible) which is also housed in the measuring ring 56 or in its housing 76, so that measurement signals from the temperature sensor 60 or 16' are supplied to it for processing, in particular for determining the jacket temperature of a shrink sleeve 4 140 housed in the cooling attachment 74.

[0131] The microcontroller 86, in turn, is (not visible) connected via a supply line 84 to a control unit 68 or - in short - to a control 68 - of the cooling device 12, to which it transmits its signals, such as the jacket temperature.

[0132] Depending on the current jacket temperatures, the control unit 68 can then control a cooling process 120 (with a shrink-fit insert 4 included in the cooling attachment 74) 160.

[0133] How Fig. 9aAs also shown, the measuring ring 56 provides an LED (heat) status indicator 64 in the form of two colored LEDs 82, 94 arranged on the end faces of the two legs 88, 90 and thus visible to a user, one of which is red 82, the other green 94 and which - also connected to the control unit 68 via the microcontroller 86 - are also controlled via the control unit 68.

[0134] A lit green LED 94 indicates a heat state of a shrink sleeve 4 that has cooled down sufficiently to be safely touched by hand; a lit red LED 82 indicates a heat state of a shrink sleeve 4 that has not yet cooled down (sufficiently). A flashing red LED 82 indicates active cooling by the cooling system 12.

[0135] Although the invention has been further illustrated and described in detail by the preferred embodiments, the invention is not limited by the disclosed examples and other variations can be derived from them without leaving the scope of protection of the invention. Reference symbol list:

[0136] 2 Heat treatment device, shrink device, cooling device, shrink device with cooling device 4 Shrink chuck 6 Shank / rotary tool, milling cutter / milling tool 8 Mounting device, mounting opening 10 Center axis, coil axis 12 Heat treatment unit, induction coil assembly, cooling device / unit 14 Measuring unit 16, 16' Temperature sensor, pyrometer with radiation detector, radiation detector 18 (Coil) housing 20 Interruptions 22 Measuring channel 24 Coil winding 26 Breakdown 28 Control / regulation unit 30 Ratio pyrometer 32 Sleeve section 34 Span range 36 Front aperture 38 Anterior end 40 Tool shank, milling cutter shank 42 Front working section 44 Axial central area 46 Coil-side inner section 48 Outer wall 50 Induction coil housing 52 Cable 54 Focusing device, shielding device, aperture 56 (Annular) assembly, measuring / sensor ring 58 Central axis of the (annular) assembly / measuring ring 60 Sensor 62 Different type of second sensor, distance sensor, optical (distance) sensor, ultrasonic sensor, laser sensor, (infrared) reflection sensor, 64 Display device, (LED) (heat) status indicator 66 Calculation unit 68 Control, control unit 70 Stand 72 Cooling head 74 Cooling attachment 76 (Measuring ring) housing 78 Transmitter 80 Receiver 82 (red) LED 84 Lead wire 86 Microcontroller 88 (left) leg 90 (right) leg 92 Continuity, open circuit 94 (green) LED 96 (ultrasonic) distance sensor 98 reflection sensor 100Process 120Heat treatment, heating, shrinking / unshrinking, cooling 140Determining a resulting jacket / surface temperature 160Control / control of the heat treatment, control / control of the heating / cooling, control / control of the heating power or the current supply 180Performing a calibration / setting or adjustment on at least one (first) temperature sensor (16) using the different second sensor (62), interaction of the at least one (first) temperature sensor (16) with the different second sensor (62) 200Interaction of a first different second sensor (62) with a second different second sensor (62) 220Detecting a shrink-fit insert (4) received in the receiving device (8) using a different second sensor.

[0137] The scope of protection is defined by the patent claims.

Claims

1. Appliance (2) for a heat treatment, in particular for inductive heating or cooling, of shrink chucks (4) for shaft-type tools (6), in particular a shrinkage appliance (2) or a cooling appliance (2) or a shrinkage appliance with cooling appliance (2), having a receiving device (8), in particular a receiving opening (8), for receiving a shrink chuck (4), having a heat treatment unit (12) which in particular concentrically surrounds the receiving device (8) with respect to a central axis (10), in particular an induction coil arrangement (12) or a cooling unit (12), and having a measuring unit (14) for in particular contactless temperature measurement of the shrink chuck (4), wherein the measuring unit (14) has multiple temperature sensors (16) which are arranged around the receiving device (8) and which serve for in particular contactless detection of a shell temperature of a shrink chuck (4) arranged in the receiving device (8), characterized in that at least two, in particular several or all, of the temperature sensors (16) have different configurations / measurement settings by virtue of their being calibrated differently, or in that the measuring unit (14) has at least one temperature sensor (16') which is arranged around the receiving device (8) and which is inclined relative to the central axis (10) and which serves for in particular contactless detection of a shell temperature of a shrink chuck (4) arranged in the receiving device (8).

2. Appliance (2) according to any one of the preceding claims, characterized in that at least two, in particular several or all, of the temperature sensors (16) have different configurations / measurement settings by virtue of temperature sensors being differently calibrated for / to different materials / surfaces of shrink chucks (or different emissivities ε) and / or having measurement ranges in different wavelength ranges.

3. Appliance (2) according to any one of the preceding claims, characterized in that each of the multiple temperature sensors (16) and / or the inclined temperature sensor (16') are configured as a radiation detector, in particular as a pyrometer with a radiation detector for detecting thermal radiation from a shrink chuck (4) arranged in the receiving device (8).

4. Appliance (2) according to any one of the preceding claims, characterized in that an inclination angle of the inclined temperature sensor (16') is between 30° and 60°, in particular 45°.

5. Appliance (2) for a heat treatment, in particular for inductive heating or cooling, of shrink chucks (4) for shaft-type tools (6), in particular a shrinkage appliance or a cooling appliance or a shrinkage appliance with cooling appliance, having a receiving device (8), in particular a receiving opening (8), for receiving a shrink chuck (4), having a heat treatment unit (60) which in particular concentrically surrounds the receiving device (8) with respect to a central axis (10), in particular an induction coil arrangement (12) or a cooling unit (62), and having a measuring unit (14) for in particular contactless temperature measurement of the shrink chuck (4), wherein the measuring unit (14) has multiple sensors (60) which are arranged around the receiving device (8), characterized in that at least a first of said sensors is a temperature sensor (16) for in particular contactless detection of a shell temperature of a shrink chuck (4) arranged in the receiving device (8), and at least a second of said sensors is a sensor (62) of different type for detection of another property of the shrink chuck (4) arranged in the receiving device (8).

6. Appliance (2) according to the preceding claim, characterized in that the at least one second sensor (62) of different type is a distance sensor (62) that measures in particular in contactless fashion, in particular an optical sensor (62) or an ultrasound sensor (62) or a laser sensor (62) or a reflection sensor (62), in particular an infrared reflection sensor (62).

7. Appliance (2) according to any one of the preceding claims, characterized in that at least two, in particular several or all, of the temperature sensors (16) have different configurations / measurement settings by virtue of temperature sensors being differently calibrated for / to different materials / surfaces of shrink chucks (or different emissivities ε) and / or having measurement ranges in different wavelength ranges.

8. Appliance (2) according to any one of the preceding claims, characterized in that the sensors (16, 60, 62) are arranged in circular form and / or at different axial heights with respect to the central axis (10) at or around the receiving device (8).

9. Appliance (2) according to any one of the preceding claims, characterized in that the sensors (16, 60, 62) are arranged in a substantially ring-shaped structural unit (56), in particular in substantially circular form about a central axis (58) of the substantially ring-shaped structural unit (56) and / or at different axial heights or in particular at the same axial height with respect to the central axis (58) of the substantially ring-shaped structural unit (56).

10. Appliance (2) according to the preceding claim, characterized in that the substantially ring-shaped structural unit (56) is arranged coaxially with respect to the central axis (10) in the appliance (2), in particular axially adjacent to the heat treatment unit (12), in particular the induction coil arrangement (12) or the cooling unit (12), and / or in that of the sensors (16, 60, 62), sensors of the same type are arranged adjacently in the substantially ring-shaped structural unit (56).

11. Method (100) for operating an appliance (2) according to at least one of the preceding appliance claims, in particular for inductive heating (120) of a shrink chuck (4) or cooling of a shrink chuck (4), in an appliance (2) according to at least one of the preceding shrinkage appliance claims, in which method a resulting shell temperature of a shrink chuck (4) arranged in the receiving device (8) is ascertained (140) using the multiple sensors (16, 60, 62), in particular using shell temperatures, detected by multiple temperature sensors (16), of the shrink chuck (4) arranged in the receiving device (8).

12. Method (100) according to any one of the preceding method claims, characterized in that a shrink chuck (4) in the receiving device (8), which is surrounded by a heat treatment device (12) configured as an induction coil arrangement (12), is inductively heated (120) and thus expanded, and in that the heating operation is controlled (160) using the resulting shell temperature, or in that a shrink chuck (4) in the receiving device (8), which is surrounded by a heat treatment device (12) configured as a cooling unit (12), is cooled (120), and in that the cooling operation is controlled (160) using the resulting shell temperature.

13. Method according to any one of the preceding method claims, characterized in that different calibrations / settings, in particular different emissivities ε, are set at multiple temperature sensors (16), and measurements from the multiple temperature sensors (16) are compared and / or jointly processed, and from these the resulting shell temperature is determined (140).

14. Method according to any one of the preceding method claims, characterized in that a signal from one and the same radiation sensor (62) is evaluated in different ways.

15. Method according to any one of the preceding method claims, characterized in that a calibration / setting or adjustment at at least one temperature sensor (16) is performed (180) using a measurement from the second sensor (62) of different type, or in that, using a measurement from the second sensor (62) of different type, it is determined (180) how the resulting shell temperature is determined (140), in particular from the measurements from multiple temperature sensors (16).

16. Appliance (2) for a heat treatment, in particular for inductive heating or cooling, of shrink chucks (4) for shaft-type tools (6), in particular a shrinkage appliance (2) or a cooling appliance (2) or a shrinkage appliance with cooling appliance (2), having a receiving device (8), in particular a receiving opening (8), for receiving a shrink chuck (4), having a heat treatment unit (12) which in particular concentrically surrounds the receiving device (8) with respect to a central axis (10), in particular an induction coil arrangement (12) or a cooling unit (12), and having a measuring unit (14) for in particular contactless temperature measurement of the shrink chuck (4), characterized in that the measuring unit (14) has a quotient pyrometer (30).