Machine tool and process with improved cooling

Abstract

The invention relates to a machine tool (1) with a spindle for machining a workpiece (2) by means of a tool (3), comprising a combined cooling-lubrication system (4) with a lubrication arrangement (5) and a cooling arrangement (6), wherein the lubrication arrangement (5) has a first reservoir (51) for a liquid lubricant, wherein the lubrication arrangement (5) is configured to supply the lubricant to a machining area (8) for lubrication purposes during pre-machining and / or further machining of the workpiece (2) following the pre-machining, wherein the cooling arrangement (6) has a second reservoir (61) for a readily evaporating coolant, wherein the cooling arrangement (6) is configured to cool the workpiece (2) after pre-machining by means of the coolant in the machining area (8), wherein the coolant performs the cooling of the workpiece by means of evaporation, and a control unit (10) which is configuredto determine a duration for cooling the workpiece (2), after which the workpiece (2) reaches a predetermined temperature by cooling by means of the coolant in such a way that dimensional deviations on the workpiece (2) to be machined due to thermal influences during further processing are avoided.

Description

[0001] The present invention relates to a machine tool with a spindle for machining a workpiece by means of a tool and a method therefor, wherein a combined cooling-lubrication system is provided on the one hand for lubricating and on the other hand for cooling the workpiece.

[0002] State-of-the-art machine tools are known in various designs. Many machine tools feature oil or emulsion lubrication. Oil is used, particularly when machining requires high levels of precision, to ensure the workpiece is precisely tempered. The disadvantage of machining with oil, however, is the high level of cleaning required for the workpiece after machining. High precision is not possible using emulsions due to the evaporative cooling effect. Although the heat generated during machining can be dissipated, emulsions usually contain a component, particularly water, which evaporates after exiting the nozzles in the work area, thereby significantly cooling the work area and workpiece. This leads to thermally induced deformation of the machine and / or the workpiece, making precise machining of the workpiece impossible.Another machining option on machine tools is the lubrication and cooling of the machining process using minimum quantity lubrication. In addition to a lubricating oil and additives, lubricants for minimum quantity lubrication often contain evaporating components to cool the machining process and the workpiece. This can achieve good lubrication to reduce tool wear. However, due to the small quantities involved in minimum quantity lubrication, heating of the workpiece during roughing or rough machining with minimum quantity lubrication cannot be avoided.If the amount of lubricant delivered is significantly increased in minimum quantity lubrication in order to improve not only lubrication but also the cooling effect through the evaporating components of the lubricant, the workpiece will become heavily oiled during machining due to the oils contained in the lubricant, which leads to chips sticking to the workpiece and a significant amount of cleaning after machining. If one attempts to significantly increase the evaporating components in the lubricant for minimum quantity lubrication so that the cooling effect is greater, the resulting low flash points of the lubricant create a high fire hazard during machining in the machine tool. Machine tools of this type are known from DE 10 2004 040 972 A1, DE 199 15 619 A1, JP 2002-66871 A, and CN 212420560 U.

[0003] It is therefore an object of the present invention to provide a machine tool and a corresponding method for machining a workpiece, which enable targeted lubrication and cooling of the workpiece with a simple structure and simple, cost-effective manufacture.

[0004] This object is achieved by a machine tool having the features of claim 1 and a method having the features of claim 14. The subclaims show preferred developments of the invention.

[0005] The machine tool according to the invention, comprising a spindle for machining a workpiece by means of a tool having the features of claim 1, has the advantage that the highest accuracy requirements are possible when machining the workpiece. Thus, the workpiece can be machined by means of highly precise machining, in which no temperature-related deviations occur with regard to the dimensions of the workpiece. This is achieved according to the invention in that the machine tool comprises a combined cooling and lubrication system with a lubrication arrangement and a cooling arrangement. The lubrication arrangement has a first reservoir for a liquid lubricant, wherein the lubrication arrangement is configured to supply the lubricant to a machining area for lubrication purposes during pre-machining of the workpiece and / or further machining of the workpiece following the pre-machining.This ensures sufficient lubrication while the workpiece is being machined with the tool, enabling good cutting and precise machining. The cooling arrangement further comprises a second reservoir for a readily evaporating coolant. The cooling arrangement is designed to cool the workpiece after pre-machining, during which heating of the workpiece cannot usually be avoided due to significant material removal, using the coolant in the machining area. The coolant cools the workpiece by evaporation. This has the advantage that the workpiece is cooled by the evaporation of the coolant. As a result, no coolant residue remains on the workpiece and / or in the working area of ​​the machine tool. This means that any chips that may still be present can remain dry, which significantly simplifies chip disposal.By evaporating the coolant directly onto the workpiece, the workpiece can be cooled to the temperature of the machine tool's working chamber within a very short time, preferably less than 20 minutes. This allows subsequent operations on the thus cooled workpiece to be resumed after only a short cooling time. This allows machining of the workpiece to be performed significantly more precisely.

[0006] Since significantly less material is removed from the workpiece in subsequent operations after rough or rough machining, hardly any heat is generated during these subsequent operations. As a result, the temperature of the workpiece changes only insignificantly during subsequent operations. Therefore, preferably, no further cooling is required during the post-processing steps.

[0007] The machine tool further comprises a control unit configured to determine a duration for cooling the workpiece. The control unit determines the duration of cooling by means of the coolant such that the workpiece reaches a predetermined temperature, thus preventing dimensional deviations in the workpiece to be machined due to thermal influences during further processing.

[0008] Preferably, the duration for cooling the workpiece using the coolant is predetermined before further processing of the workpiece. Preferably, a predetermined time, e.g., fifteen minutes, is specified for the duration of cooling the workpiece. The control unit is preferably programmable so that the predetermined cooling time can be changed depending on the dimensions and / or the processing time of the workpiece.

[0009] More preferably, the lubricant and / or the coolant is guided to the workpiece either through the spindle and / or a tool holder and / or a tool or a nozzle held in a tool holder. One or more separately provided nozzles can be used here. The nozzles can also be arranged in other areas in the working area of ​​the machine tool or next to the spindle. The control unit is preferably configured to control different nozzles for cooling depending on the heating of the workpiece. In practice, applications often arise in which areas of the workpiece have heated up to different degrees after rough machining. The control unit can therefore control the coolant in such a way that only partial areas of the workpiece are wetted with the coolant.For example, thicker-walled sections of the workpiece may require longer cooling by spraying with coolant than sections with thinner walls. Preferably, a relative movement between the spindle and the workpiece is performed, particularly when the coolant is supplied through nozzles on or next to the spindle or on the tool holder, or through the nozzle in a tool holder that is clamped into the spindle instead of the tool, in order to cool different sections of the workpiece for different lengths of time.

[0010] Further preferably, one or more nozzles of the combined cooling-lubricating system are arranged to be movable in order to change positions relative to the workpiece and / or a distance between the nozzle and the workpiece and / or a spray angle to the workpiece.

[0011] Particularly preferably, one or more nozzles are arranged adjacent to the tool or adjacent to the spindle or on the spindle. This allows the nozzles to be moved together with the tool or spindle relative to the workpiece, and after rough machining, the cooling process can be carried out precisely at the points where the workpiece was machined during rough machining. Further preferably, the nozzles are arranged on a stationary component of the machine tool. The nozzles are preferably adjustable.

[0012] Further preferably, the control unit is configured to control the cooling arrangement such that the duration of the cooling process and / or the amount of coolant supplied depend on the geometry of the workpiece. Thus, individual cooling of the individual workpieces or sub-regions of the workpieces can be achieved.

[0013] The machine tool further preferably comprises a temperature measuring device, in particular an infrared camera or a temperature sensor. The temperature measuring device is configured to detect a temperature of the workpiece. Preferably, a temperature of the entire workpiece is detected, or alternatively, only a temperature of partial areas of the workpiece is detected.

[0014] The temperature measuring device is configured to detect the temperature of the workpiece during a cooling process with the coolant and / or to determine the temperature of the workpiece following a cooling process. The temperature measuring device is preferably arranged adjacent to the spindle and, in particular, is movable together with the spindle relative to the workpiece. The infrared camera preferably records the temperature of the entire workpiece. Preferably, multiple infrared cameras are provided to detect the temperature of all sides of the workpiece.

[0015] Further preferably, the temperature measuring device is configured to separately measure the temperature of the workpiece in different partial areas of the workpiece. This is preferably achieved by moving axes of the machine tool and / or by changing relative positions between the temperature measuring device and the workpiece. Alternatively, the different temperatures of the workpiece in different partial areas can be measured using an infrared camera, which captures the entire workpiece in one image and evaluates the captured image accordingly. Thus, the temperature of the workpiece can be separately measured in different partial areas.

[0016] Further preferably, the control unit is configured to separately cool areas of the workpiece that have an excessively high temperature by supplying the coolant. Preferably, the temperature of the workpiece is determined before the cooling process, and if partial areas of the workpiece that have an excessively high temperature are detected, a targeted cooling process is performed for these partial areas.

[0017] According to a particularly preferred embodiment of the invention, the control unit is configured to cool the workpiece or regions of the workpiece by supplying coolant until a temperature detected by the temperature measuring device falls below a predetermined limit value.

[0018] Preferably, the control unit is configured to allow a waiting period after cooling the workpiece with the coolant until the coolant has evaporated from the workpiece and / or a temperature equalization in the workpiece between the just-cooled workpiece surface and any residual heat present inside the workpiece has occurred before further machining of the workpiece takes place. Preferably, after the waiting period, the temperature of the workpiece can be checked again with the temperature measuring device to enable the most precise machining of the workpiece possible, regardless of temperature-related influences.

[0019] Further preferably, the control unit is configured to carry out the cooling of the workpiece with the coolant and a subsequent temperature detection several times in succession until the workpiece has reached a predetermined required temperature for further processing.

[0020] The present invention further relates to a method for machining a workpiece by means of a tool in a machine tool. The machine tool has a combined cooling and lubrication system with a lubrication arrangement and a cooling arrangement, wherein the lubrication arrangement has a first reservoir for a liquid lubricant and the cooling arrangement has a second reservoir for a readily evaporating coolant. The method comprises the steps of pre-machining the workpiece, in particular by means of rough machining or roughing, in particular with simultaneous lubrication by the lubrication arrangement. Subsequently, after completion of the pre-machining, the workpiece is cooled by means of the coolant, wherein the coolant cools the workpiece by means of evaporation. This means that the coolant applied to the workpiece evaporates and thus cools the workpiece.Furthermore, according to the method according to the invention, the temperature of the cooled workpiece is monitored. The monitoring can be carried out during the cooling process or alternatively after the cooling process, in particular after a predetermined time has elapsed. In this case, a first temperature measurement process preferably does not have to be carried out before a cooling process, since experience has shown that the workpiece has an elevated temperature after rough machining, so that the workpiece always has to be cooled. In this case, a predetermined period of time can preferably be specified for the duration of the cooling. As soon as the temperature of the workpiece has reached a predetermined temperature due to the cooling, further machining of the workpiece, in particular fine machining, is carried out. The predetermined temperature is selected such that dimensional deviations on the workpiece to be machined due to thermal influences during further machining are avoided.During further processing, lubricant is preferably supplied to a processing area of ​​the tool on the workpiece by the lubrication arrangement.

[0021] According to a preferred embodiment of the method according to the invention, the coolant is applied depending on a geometry of the workpiece in terms of time and / or with regard to an amount of the coolant supplied and / or different spray angles and / or different spray positions.

[0022] The lubricant is preferably a lubricant that promotes a machining process that is as wear-free as possible. The lubricant preferably contains a lubricating oil with suitable additives. The lubricant may also contain evaporating components that serve to cool the workpiece during machining. To prevent the oil contained in the lubricant from contaminating the workpiece during machining, only a small amount of lubricant is added. This results in the workpiece heating up during rough machining because the cooling provided by the evaporating components of the lubricant is insufficient. The coolant is preferably a cold cleaner that evaporates completely without leaving any residue.

[0023] By lubricating only with oil, a very high level of precision can be achieved during machining, since, in comparison to emulsion lubrication, there are no time-related influences caused by strongly evaporating components of a lubricant, as in the state of the art.

[0024] Lubrication is preferably carried out during rough machining of the workpiece.

[0025] It is also preferred that only coolant is applied to the workpiece during the cooling process.

[0026] If the machine tool preferably has an infrared camera and a temperature sensor, a combined temperature measurement of the workpiece is preferably performed using both temperature measuring devices. The infrared camera preferably captures the entire workpiece, and the temperature sensor preferably captures temperature-critical sub-areas of the workpiece. Preferably, a temperature measurement of the workpiece can also be performed using only one temperature sensor.

[0027] Preferably, after rough machining, a relative position between a spindle and the workpiece is changed to detect the temperature. A temperature sensor is preferably arranged adjacent to the spindle and / or adjacent to the tool holder. Further preferably, to detect the temperature in different areas of the workpiece, the spindle is moved into different positions relative to the workpiece by moving axes, in order to detect the temperature of the workpiece separately, preferably in sub-areas of the workpiece. Further preferably, if a sub-area of ​​the workpiece has an excessively high temperature, a targeted cooling process is carried out for this sub-area.

[0028] Machine tools according to preferred embodiments of the invention are described in detail below with reference to the accompanying drawings. In the drawing: Fig. 1 is a schematic view of a machine tool according to a first embodiment of the invention, and Fig. 2 a schematic view of a machine tool according to a second embodiment of the invention.

[0029] The following is based on reference to Fig. 1 a machine tool 1 according to a first preferred embodiment of the invention is described in detail.

[0030] The machine tool 1 comprises a spindle 11 in which a tool 3 is held in a tool holder 12.

[0031] A workpiece 2 is machined using tool 3.

[0032] The machine tool 1 further comprises a combined cooling and lubrication system 4. The cooling and lubrication system 4 comprises a lubrication arrangement 5 and a cooling arrangement 6.

[0033] As from Fig. 1, the lubrication arrangement 5 comprises a first reservoir 51 filled with a liquid lubricant. The liquid lubricant is a lubricant that promotes the most wear-free machining possible and preferably contains an oil with additives and, if necessary, evaporating components for cooling the machining process. The lubricant is supplied to a machining area 8 in a work space 9 of the machine tool 1 during pre-machining and / or during further machining of the workpiece 2 following the pre-machining.

[0034] The cooling arrangement 6 comprises a second reservoir 61 containing an easily evaporated liquid coolant. The cooling arrangement 6 is configured to cool the workpiece 2 after pre-machining using the coolant in the machining area 8. Cooling occurs through evaporation of the coolant. The coolant is preferably a cold cleaner and evaporates without leaving residue on the workpiece 2. No further lubricant is added during the cooling process.

[0035] The cooling and lubrication system 4 further comprises a plurality of nozzles 40 arranged adjacent to the spindle 11. The nozzles 40 are in fluid communication with the first reservoir 51 and the second reservoir 61, with a first shut-off device 52 for shutting off the first reservoir 51 and a second shut-off device 62 for shutting off the second reservoir 61 being arranged in the fluid connection. Thus, the coolant and the lubricant are supplied via the same nozzles 40.

[0036] It should be noted that it is of course also possible to provide separate supply channels for the lubricating arrangement and separate supply channels for the cooling arrangement, which are then each sprayed via separate nozzles.

[0037] The machine tool 1 further comprises a temperature measuring device 7, which in this embodiment is an infrared camera 70 or alternatively can be a temperature sensor, e.g. an infrared sensor. As can be seen from Fig. 1, the infrared camera 70 is also arranged adjacent to the spindle 11 or the tool holder 12. The infrared camera 70 preferably detects a partial area of ​​the workpiece 2. By moving the axes of the machine tool 1, a relative movement occurs between the infrared camera 70 or temperature sensor and the workpiece 2, so that the temperature of partial areas of the workpiece 2 can be detected.

[0038] The control unit 10 is thus configured to determine a duration for the cooling of the workpiece 2, after which the workpiece 2 reaches a predetermined temperature through cooling by means of the coolant in such a way that dimensional deviations on the workpiece to be machined due to thermal influences during further processing can be avoided. For this purpose, the temperature measuring device 7 can take a temperature measurement either continuously during the cooling process or after the cooling process, or preferably after a predetermined time has elapsed. If necessary, cooling can be continued if the workpiece has not yet reached a predetermined temperature. In this case, partial areas of the workpiece that, for example, still have an elevated temperature can also be specifically cooled.

[0039] The method according to the invention for machining a workpiece 2 thus ensures that during rough machining of the workpiece 2, lubrication is carried out by the lubrication arrangement 5 with a lubricating medium that enables machining that is as wear-free as possible. After pre-machining, cooling is carried out by means of the cooling arrangement 6. For this purpose, the temperature can be measured before the start of cooling and / or after cooling and / or, preferably, the temperature measurement can only begin after a predetermined period of time, since the workpiece temperature tends to be higher after rough machining.

[0040] The predetermined time period until the temperature measurement begins, in particular after a cooling process, is preferably workpiece-dependent and can be set by means of the control unit.

[0041] As in Fig. 1, indicated by the double arrows A, a relative movement between workpiece 2 and spindle 11 can also occur during cooling to cool different areas of workpiece 2. Areas of the workpiece with large material accumulation tend to be cooled for longer than thin-walled areas. The relative movement also allows temperature measurements to be taken in different areas of the workpiece.

[0042] Once the temperature of the cooled workpiece 2 has reached a predetermined temperature, the workpiece 2 can be further processed, whereby, in particular during further processing, especially fine machining, no significant thermal influences are present, and in particular, ultra-precision machining is possible. During further processing, preferably, only the lubricant from the lubrication system 5 can be used again to increase machining accuracy and tool service life.

[0043] Fig. 2 shows a machine tool 1 according to a second embodiment of the invention, wherein identical or functionally identical parts are designated by the same reference numerals as in the first embodiment.

[0044] As from Fig. 2, the machine tool 1 of the second embodiment has a different temperature measuring device 7 and different nozzle arrangements of the nozzle 40 for supplying coolant.

[0045] As in Fig. 2, the temperature measuring device 7 comprises an infrared camera 70, which is arranged on a frame of the machine tool 1. The infrared camera 70 is rotatably arranged in order to be able to record the workpiece 2 at different angles. The infrared camera 70 is configured to record an image of the entire workpiece 2 and to determine the different temperatures of partial areas of the workpiece by image analysis. Furthermore, the temperature measuring device 7 comprises a temperature sensor 71, preferably an infrared sensor, which is arranged on the spindle 11 next to the tool holder 12. As a result, the temperature measurement can be carried out directly, in particular in the area in which cooling is currently taking place, which is schematically shown in Fig. 2 is shown.

[0046] The cooling and lubrication system 4 comprises a cooling arrangement 6, in which a nozzle 40 pivotable about an axis YY is arranged on a frame of the machine tool. Cooling medium can also be passed through the nozzle 40 and applied to the workpiece 2 in the work space 9 of the machine tool 1. Furthermore, a nozzle 40 is located in a tool holder 12, which in turn is held on the spindle 11. This allows the cooling medium to be sprayed specifically onto the area where machining was recently performed using a tool 3.

[0047] Instead of through a nozzle 40 held in the tool holder 12, the cooling medium can also be sprayed onto the workpiece 2 through a tool 3 if the tool 3 is equipped with corresponding channels, for example for the supply of lubricant during machining.

[0048] As indicated by the double arrows A in Fig.2, both the infrared camera 70 and the nozzle 40 can be pivoted on the machine bed of the machine tool so that different sub-areas of the workpiece can be captured by the infrared camera 70 or sprayed and cooled by the nozzle 40. Likewise, as indicated by the double file A, the nozzle 40 held in the tool holder 12 and the temperature sensor 71 can be moved relative to the workpiece in order to cool different sub-areas of the workpiece or to detect their temperature.

[0049] Thus, the present machine tool 1 according to the invention and the method according to the invention can ensure that the machining of workpieces 2 by means of the machine tool 1 can meet the highest precision requirements. In particular, lubrication is carried out with a lubricant that is conducive to machining that is as wear-free as possible, in particular with an oil with additives, and cooling is carried out by a coolant that evaporates completely and without residue, thus leaving no residue on the workpiece or, if applicable, on the chips. Thus, in particular, the chips can be easily disposed of and there is no need to remove a coolant from the working space 9 of the machine tool. Subsequent further machining of the workpiece 2 can thus be carried out with the highest precision. During further machining, the lubrication arrangement 5 can also provide lubricant for lubrication.Since hardly any material is removed during further processing, hardly any heat is generated during these operations, so that no thermally induced inaccuracies arise.

[0050] In addition to the above written description of the invention, reference is hereby explicitly made to the graphic representation of the invention in the figures for its supplementary disclosure. List of reference symbols 1 machine tool 2 Workpiece 3 tools 4 Cooling and lubrication system 5 Lubrication arrangement 6 Cooling arrangement 7 Temperature measuring device 8 Editing area 9 Workspace 10 Control unit 11 spindle 12 tool holders 40 nozzle 51 first reservoir 52 first shut-off device 61 second reservoir 62 second shut-off device 70 infrared camera 71 Temperature sensor A Relative movement between workpiece and temperature measuring device / nozzle YY axis

Claims

[1] Machine tool (1) with a spindle (11) for machining a workpiece (2) by means of a tool (3), comprising - a combined cooling-lubrication system (4) with a lubricating arrangement (5) and a cooling arrangement (6), - wherein the lubricating arrangement (5) has a first reservoir (51) for a liquid lubricant, wherein the lubricating arrangement (5) is designed to supply the lubricant to a processing area (8) for lubrication purposes during pre-processing and / or further processing of the workpiece (2) following the pre-processing, - wherein the cooling arrangement (6) has a second reservoir (61) for a readily evaporating coolant, wherein the cooling arrangement (6) is configured to cool the workpiece (2) after pre-machining by means of the coolant in the machining area (8), wherein the coolant performs the cooling of the workpiece (2) by means of evaporation, and - a control unit (10) which is designed to determine a duration for the cooling of the workpiece (2), after which the workpiece (2) reaches a predetermined temperature by cooling by means of the coolant in such a way that dimensional deviations on the workpiece (2) to be machined due to thermal influences during further processing are avoided. [2] Machine tool (1) according to claim 1, wherein the duration for cooling the workpiece (2) by means of the coolant is predetermined, in particular programmable by means of the control unit (10), before further processing of the workpiece (2) takes place. [3] Machine tool (1) according to one of the preceding claims, wherein the lubricant from the first reservoir (51) and / or the coolant from the second reservoir (61) of the combined cooling-lubrication system (4) are passed either through a spindle (11) and / or a tool holder (12) and / or a tool (3) and / or a nozzle (40) held in the tool holder (12) and / or through one or more nozzles (40) arranged separately in the machine tool (1). [4] Machine tool (1) according to claim 3, wherein one or more nozzles (40) of the combined cooling-lubricating system (4) are movably arranged to change a position relative to the workpiece (2) and / or a distance and / or a spray angle to the workpiece (2). [5] Machine tool (1) according to one of the preceding claims, wherein one or more of the nozzles (40) are arranged adjacent to the tool (3) or to the spindle (11) and are movable together with the tool (3) or with the spindle (11) relative to the workpiece (2) and / or wherein the nozzles (40) are arranged on a stationary component of the machine tool (1). [6] Machine tool (1) according to one of the preceding claims, wherein the control unit (10) is configured to control the cooling arrangement (6) such that the duration of the cooling process and / or the quantity of coolant supplied depend on a geometry of the workpiece (2). [7] Machine tool (1) according to one of the preceding claims, further comprising a temperature measuring device (7), in particular an infrared camera (70) or a temperature sensor (71), which is configured to detect a temperature of the workpiece (2). [8] Machine tool (1) according to claim 7, wherein the temperature measuring device (7) is configured to detect the temperature of the workpiece (2) during a cooling process with the coolant or following a cooling process and / or wherein the temperature measuring device (7) is arranged adjacent to the spindle (11) and in particular is movable with the spindle (11) relative to the workpiece (2). [9] Machine tool (1) according to one of claims 7 or 8, wherein the temperature measuring device (7) is configured to separately detect the temperature of the workpiece (2) at different regions of the workpiece (2), in particular by moving axes of the machine tool (1), or wherein the control unit (10) is configured to change a relative position between the temperature measuring device (7) and the workpiece (2) in order to separately detect the temperature of the workpiece (2) at different regions of the workpiece. [10] Machine tool (1) according to one of the preceding claims, wherein the control unit (10) is configured to separately cool regions of the workpiece (2) which have an excessively high temperature by supplying the coolant. [11] Machine tool (1) according to one of the preceding claims, wherein the control unit (10) is configured to cool the workpiece (2) or regions of the workpiece (2) by supplying the coolant until a temperature detected by the temperature measuring device (7) falls below a limit value. [12] Machine tool (1) according to one of the preceding claims, wherein the control unit (10) is configured to allow a waiting period to elapse after a cooling process of the workpiece (2) with the coolant of the cooling arrangement (6) until the coolant on the workpiece (2) has evaporated and / or a temperature equalization in the workpiece (2) between the just cooled workpiece surface and residual heat in the interior of the workpiece (2) has taken place, before further processing takes place or the temperature of the workpiece (2) is detected with the temperature measuring device (7). [13] Machine tool (1) according to one of claims 7 to 12, wherein cooling of the workpiece (2) with the coolant and subsequent temperature detection with the temperature measuring device (7) takes place several times in succession until a required temperature of the workpiece (2) has been reached. [14] Method for machining a workpiece (2) by means of a tool (3) in a machine tool (1) which has a combined cooling-lubrication system (4) with a lubricating arrangement (5) and a cooling arrangement (6), wherein the lubricating arrangement (5) has a first reservoir (51) for a liquid lubricant, and wherein the cooling arrangement (6) has a second reservoir (61) for an easily evaporating coolant, comprising the steps - Pre-machining of the workpiece (2), - after completion of the pre-processing, cooling the workpiece (2) by means of the coolant, wherein the coolant cools the workpiece (2) by evaporation, - monitoring a temperature of the cooled workpiece (2), and - as soon as the temperature of the cooled workpiece (2) has reached a predetermined temperature, further processing of the workpiece (2), wherein the predetermined temperature is selected such that dimensional deviations on the workpiece (2) to be machined due to thermal influences during further processing are avoided and wherein, during further processing, the lubricating arrangement (5) supplies lubricant to a processing area (8) of the tool (3) on the workpiece (2). [15] Method according to claim 14, wherein the coolant of the cooling arrangement (6) is applied to the workpiece (2) and / or at different spray angles and / or spray positions depending on a geometry of the workpiece (2) in terms of time and / or with regard to an amount of the supplied coolant.

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