Structural member for a machine tool and method for manufacturing the same

Abstract

The present invention relates to a structural element for a machine tool 1, said structural element 2, 2' consisting of a mineral casting, in which at least one sensor structural group 11-15 is integrated, said sensor structural group 11-15 being completely surrounded by the mineral casting and comprising at least one sensor S1-S5 for detecting a mechanical load S1-S5 on said structural element during operation of the machine tool.

Description

Technical Field

[0001] The present invention relates to a structural member for a machine tool, a method for manufacturing such a structural member, a machine tool provided with such a structural member, and the use of such a structural member in a machine tool.

Background Art

[0002] Machine tools are used in various industrial sectors such as, for example, machine building, semiconductor industry, medical technology, laser inspection, automation or electronics. Machine tools generally have a mechanical structure, which is usually fixed or arranged in a fixed position and is hereinafter also referred to as a "structural member". The structural member serves to position an object to be processed or measured with respect to the machine tool in a defined manner and can be configured, for example, as a machine bed, a stand, a portal, a spindle suspension, a machine body or the like.

[0003] An example of such a machine tool is a machine tool provided with a structural member configured as a machine bed, where a workpiece to be processed is positioned and processed with a tool of the machine tool. As a reference point for the interaction between the tool and the workpiece, the tool center point (abbreviated as TCP) is represented.

[0004] Thermal effects and mechanical loads that occur during the operation of the machine tool or that can be caused by external influences on the machine can cause geometric changes, in particular dimensional changes, in the machine bed. This can have an adverse effect on the operation of the machine tool and, in particular, can reduce the processing accuracy of the workpiece, for example, by sliding of the tool center point from its desired position. Therefore, the machine bed is usually designed to be large and strong enough to withstand mechanical loads, against which the effects caused by heat can only be compensated or managed insufficiently or with a burden.

[0005] Patent Document 1 describes a machine bed made of an inorganic casting in which the pipes of a cooling system are integrated into the inorganic casting. A temperature sensor measures the temperature of the machine bed, and the cooling system is controlled according to the detected temperature value.

[0006] Detection of changes in such a machine bed by heat is usually only possible in a time-shifted form, or in some cases, short-term changes cannot be detected, especially due to the thermal inertia of the machine bed. Thermal compensation for changes in such a machine bed is also usually only possible in a time-shifted form.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] The problem of the present invention is to provide an alternative or improved structural member for a machine tool, or an alternative or improved manufacturing method for such a structural member, which can detect the mechanical load acting on the structural member as accurately as possible and / or detect the mechanical load almost in real time.

Means for Solving the Problems

[0009] This problem is solved by the structural member according to claim 1, the machine tool according to claim 9, the manufacturing method according to claim 10, and the use of the structural member according to claim 14. The improved configurations of the present invention are presented in the dependent claims respectively. In that case, the method can also be improved by the features described below for the device or detailed in the dependent claims, or vice versa. Otherwise, the features of the device and the method can also be used for each other for improvement.

[0010] The structural member according to the invention is used for a machine tool. This structural member is composed of an inorganic casting or cement-based concrete, and at least one sensor structure group is integrated into the structural member. This sensor structure group is completely surrounded by the inorganic casting or cement-based concrete and has at least one sensor for detecting mechanical loads.

[0011] This structural member advantageously serves to position an object to be processed or measured by the machine tool, i.e., a workpiece, as defined relative to the machine tool. More advantageously, a tool center point (TCP) that defines the spatial relationship between the structural member or the workpiece arranged thereon or therein and the machine tool is associated with the machine tool.

[0012] The fact that the sensor structure group is completely surrounded by the inorganic casting or cement-based concrete advantageously means that the inorganic casting or cement-based concrete, or the structural member, surrounds the sensor structure group or at least one or more of its sensors in a form-fitting manner in all three spatial directions and is in contact with the sensor structure group or one or more sensors. As will be described later, for this purpose, the sensor structure group is cast during the manufacture of the structural member. In this case, the fact that the sensor structure group or one or more sensors are completely surrounded by the inorganic casting or cement-based concrete does not exclude the possibility that a cable, which serves as a data connection for outputting the sensor values detected by the sensor structure group, for example, a part of the component associated with the sensor structure group, protrudes from the structural member.

[0013] This sensor structure group has at least one sensor, preferably a plurality of sensors, which are more preferably arranged at defined positions related to each other. In the context of the present invention, "defined positions related to each other" is understood to mean that the spatial orientation and spatial direction of the sensors are defined in relation to each other. In particular, the sensor structure group can have different sensors, i.e., sensors configured to detect different physical quantities.

[0014] This at least one sensor is preferably configured to detect at least one local mechanical load of the structural member, i.e., to directly respond to the mechanical load or load acting on the structural member within the area of the sensor. Examples of mechanical loads detectable by the sensor are presented further below. Therefore, the sensor is particularly different from a temperature sensor that detects a temperature change or absolute temperature of the structural member. In this case, the mechanical load detected by the sensor can be generated mechanically, for example, by gravity acting on the structural member or by vibration in the structural member, or thermally, for example, by a length change due to thermal induction, or both. Thereby, for example, it is possible to detect the generated mechanical load of the structural member with almost no time delay. This further enables, for example, creating as accurate a structural model of the structural member as possible within a relatively short time and detecting the mechanical load of the structural member during the operation of the machine tool almost in real time, i.e., with almost no time delay and / or as accurately as possible. In particular, compared to temperature measurements in or on the structural member, which are usually shifted in time due to the thermal inertia of the structural member, the detection of mechanical loads by this sensor structure group can have one or more of the advantages of being able to create a model of the structural member for numerical calculations in a short time and being able to create an accurate model of the structural member.

[0015] Overall, the structural member according to the present invention can directly detect or measure mechanical changes in the structural member that may adversely affect the accuracy of a processing device or a measuring device, for example, without the need for knowledge regarding the temperature characteristics of the structural member.

[0016] Generally, "concrete" or "inorganic casting" is understood to be a material composed of at least one or a plurality of fillers and a matrix. In cement-based concrete, it is the matrix of cement, and in inorganic casting, it is the matrix of plastic. By using inorganic casting or cement-based concrete as the material for the structural member, it is possible to provide, for example, a structural member that can be manufactured by an inexpensive method and / or a simple method. Thereby, for example, it is also possible to give a great degree of freedom to the sensor or the sensor structure group, particularly at locations particularly relevant to the structural member. Furthermore, the sensor can be protected against external actions, for example, over a long period of time by its embedding, which can ensure the long life of the sensor. Using a sensor for detecting mechanical loads integrated within such a structural member, for example, for one or more of the optimization of the structural member in the development stage of the structural member, the detection of possible damage occurring during the transportation of the structural member, and the monitoring and / or correction of the operation of the machine tool, it is possible to utilize the sensor throughout the life of the sensor. In this case, particularly advantageously, it is possible to realize the fact that the same sensor, i.e., the same technology, is used at the stages mentioned in these examples. For example, from the component stage, it is also possible to perform one or more of the static or dynamic evaluation of the structure of the structural member, the precise setting of the orientation and / or posture of the structural member in the assembly process, and the detection of long-term changes in the structural member after the start of use of the machine tool or during the operation of the machine tool.

[0017] Advantageously, this at least one sensor is configured to detect the mechanical load either statically, i.e., continuously, or intermittently. Thereby, this sensor is suitable for use in various measurements, for example, and it can reduce the overall number of sensors required.

[0018] Instead of or in addition to this, the at least one sensor is preferably configured to detect it within a time of within 1 ms after the mechanical load has occurred in the structural member. Thereby, for example, the detection of the mechanical load can be performed with the smallest possible time shift or almost in real time.

[0019] Advantageously, this sensor structure group or this at least one sensor is configured to detect one or more of pressure, tension, strain, compression, bending, torsion, length change, and mechanical vibration. Thereby, for example, it is possible to provide different methods for detecting (local) mechanical loads on the structural member or to detect different mechanical loads.

[0020] Advantageously, this sensor structure group or this at least one sensor is configured to detect the mechanical load absolutely. Thereby, for example, it is possible to detect changes in the structural member even during intermittent measurements, i.e., discontinuously, and especially over a long period of time. In particular, for example, it is possible to detect long-term changes in the structural member caused by, for example, operating requirements and / or programming.

[0021] Advantageously, this sensor structure group or this at least one sensor is configured to detect mechanical vibrations whose frequencies match at least the lowest natural frequency of the structural member. Thereby, for example, as will be described later, it is possible to perform a modal analysis of the structural member.

[0022] Advantageously, this sensor structure group further has at least one temperature sensor at a defined or predetermined position with respect to at least one sensor for detecting this mechanical load. This advantageously means that the spatial orientation and spatial direction of the sensors, i.e., one or more temperature sensors and one or more sensors for detecting mechanical load, are defined in relation to each other. Thereby, for example, different measured values detected by different sensors can be evaluated with respect to their mutual spatial relationship, and thus it is possible to calculate a structural model of the structural member as accurately as possible. Furthermore, by providing a temperature sensor, it is possible to observe, for example, in particular for creating a thermo-mechanical model of the structural member, the thermal effects in the structural member separately from or in association with the generated mechanical load.

[0023] Advantageously, this sensor structure group is arranged at a predetermined position of the structural member. Thereby, for example, it is possible to attach the sensor structure group at a particularly relevant location of the structural member, for example, where a large mechanical load occurs. For example, it can be attached to or near a holding part, for example, a connecting part, which serves to fix another component of a machine tool, for example, integrated in an inorganic casting or cement concrete.

[0024] Advantageously, this structural member further has at least one actuator arranged on or integrated into the structural member. More advantageously, this at least one actuator is configured to at least partially compensate for one or more of the mechanical loads of the structural member detected by this at least one sensor, in particular, pressure, tension, strain, compression, bending, torsion, length change, and mechanical vibration. This actuator can compensate or reduce the generated load, for example, mechanically, for example, by counteracting the generated force, and / or thermally.

[0025] Advantageously, this structural member is a machine bed, this machine tool is a machine tool, or both. Alternatively, this structural member can be configured, for example, as a stand, a portal, a spindle suspension, a machine body, or a structure similar thereto. Thereby, for example, different structural members that can advantageously employ the present invention are provided.

[0026] The machine tool according to the present invention has the structural member described above. Thereby, for example, it is possible to realize the actions described above with respect to the structural member in the machine tool.

[0027] The method according to the present invention serves to manufacture a structural member for a machine tool, and at least includes a step of preparing a mold for the structural member, and a step of preparing at least one sensor structure group in and / or on the mold, the sensor structure group having at least one sensor for detecting a mechanical load, and a step of pouring a liquid inorganic casting or cement concrete into the mold. Thereby, for example, a simple and inexpensive method for manufacturing the structural member according to the present invention can be provided.

[0028] Advantageously, in this method, the sensor structure group is prepared in and / or at a predetermined position of the mold. Thereby, for example, it is possible to attach the sensor structure group to a particularly relevant location of the structural member, for example, where a large mechanical load occurs.

[0029] Advantageously, this mold is removed from the structural member after the hardening of the inorganic casting or cement concrete. By removing the mold, for example, it is possible to prepare the structural member for use in a machine tool.

[0030] Advantageously, during this method, at least intermittently, measured values are detected by this at least one sensor, and based on these detected sensor values, at least one optimum value for the structural member is calculated. This optimum value can be, for example, one or more of the weight, material composition, geometric shape, and dimensions of the structural member. Thereby, for example, in the framework of quality assurance, it is possible to detect non-uniformities in the structural member or to provide a structural member that is as uniform as possible and / or optimally adapted to the intended use as specified.

[0031] In the present invention, when using the above-described structural member in a machine tool, during one or more of the operation, before the operation, and after the operation of the machine tool, the sensor values are at least intermittently detected by at least one sensor. Thereby, for example, it is possible to detect the mechanical loads respectively occurring in the structural member as accurately as possible both spatially and temporally, and in some cases, to intervene in the operation of the machine tool in order to compensate for or correct them.

[0032] Advantageously, using the detected sensor values, simultaneously with the natural vibration of the structural member, the action at the tool center point of the machine tool of the natural vibration is calculated. This action at the tool center point is advantageously calculated using another prepared sensor, for example, a vibration sensor, an acceleration sensor, etc. Thereby, for example, it is possible to perform a model analysis of the structural member, and for that purpose, to calculate the action of a predetermined excitation frequency at the tool center point, for example, so that it can be compensated or prevented.

[0033] Further features and rationalities of the present invention will become apparent from the description of the embodiments based on the accompanying drawings.

Brief Description of the Drawings

[0034]

Fig. 1a

Fig. 1b

Fig. 2

Fig. 3

DETAILED DESCRIPTION OF THE INVENTION

[0035] In the following, in connection with FIGS. 1a and 1b, an implementation configuration of the present invention will be described. FIG. 1a shows a processing machine configured as a machine tool 1 with a structural member configured as a machine bed 2. This machine tool 1 is configured to process and / or manufacture a workpiece (not shown in the drawings) using at least one tool (not shown in the drawings), and this workpiece is attached to or on the machine bed 2.

[0036] In FIG. 1a, the machine bed 2 is configured in a cuboid shape, purely as an example, and is made of mineral casting. This machine bed 2 has an upper side 3. On this upper side 3, a first linear guide portion 4a and a second linear guide portion 4b are arranged in parallel with a distance d therebetween. Sliders (not shown in detail in the drawings) can be installed on these linear guide portions 4a, 4b, and a workpiece (not shown in the drawings) can be fixed thereon or therein. This (not shown) slider is arranged to be movable along the linear guide portions 4a, 4b on the upper surface 3 of the machine bed 2.

[0037] Furthermore, the machine bed 2 is provided with a holding part 5 embedded in the mineral cast and protruding upward from the upper side 3 of the machine bed 2. In Fig. 1a, for the sake of simplification of the drawing, only the part of the support part 5 arranged in the machine bed 2 is shown. The holding part 5 shown in Fig. 1a is configured in a rod shape or a tower shape purely as an example, and the cross section in the plane of the upper side 3 is circular. A tool for processing or manufacturing a workpiece (not shown in the drawing either) can be fixed to this holding part 5, for example.

[0038] Furthermore, purely as an example, in Figs. 1a and 1b, the tool center point TCP associated with the machine tool 1 located on the upper side 3 of the machine bed 2 is shown. This tool center point can also be provided at another location of the machine tool 1, particularly above the machine bed 2.

[0039] The machine bed 2 illustrated in Fig. 1a has, by way of pure example, five groups of sensor structures 11, 12, 13, 14, 15 integrated into the machine bed, each of these groups of sensor structures 11, 12, 13, 14, 15 being completely surrounded by a casting made of an inorganic material or a cement-based concrete, i.e., these groups of sensor structures 11 to 15 are not visible from the outside when observing the machine bed 2. Each of these groups of sensor structures 11, 12, 13, 14, 15 has a sensor for detecting a mechanical load, configured as strain sensors S1 to S5, and temperature sensors T1 to T5. These strain sensors S1 to S5 can comprise, for example, glass fibers integrated into the machine bed 2, the length of which is detected by interferometry. The strain sensors S1 to S5 and the respective temperature sensors T1 to T5 of each of the groups of sensor structures 11, 12, 13, 14, 15 are at defined positions related to each other, i.e., they have a predefined spacing and a predefined orientation with respect to each other. Further, each of the groups of sensor structures 11 to 15 is arranged at a predefined position of the machine bed 2. As can be seen from the orthogonal projections of the groups of sensor structures 11 to 15 onto the upper side 5 illustrated in Figs. 1a and 1b, the first and second groups of sensor structures 11, 12 are arranged near the holding part 5, respectively, and the third, fourth, and fifth groups of sensor structures 13, 14, 15 are arranged near the linear guide parts 4a, 4b. The strain sensors S3, S4 of the third and fourth groups of sensor structures 13, 14 extend substantially parallel to the linear guide parts 4a, 4b, respectively, and can be arranged substantially vertically downward with respect to each of the linear guide parts 4a, 4b, as indicated by the dashed lines in Fig. 1a. In Fig. 1b, the strain sensors S3, S4 of the third and fourth groups of sensor structures 13, 14 are arranged in a horizontally offset manner with respect to the linear guide parts 4a, 4b. The strain sensor S5 of the fifth group of sensor structures 15 extends substantially at a right angle to the linear guide parts 4a, 4b.

[0040] Optionally, the machine tool 1 has an evaluation unit (not shown in the drawings), and each sensor structure group 11-15 or each sensor T1-T5, S1-S5 is connected to that unit via a data connection.

[0041] In the above-described embodiment, five sensor structure groups 11-15 are integrated into the machine bed 2, each having one strain sensor S1-S5 and one temperature sensor T1-T5. Also, these sensor structure groups 11-15 can be provided at least partly without a temperature sensor, or with any other sensor for detecting mechanical load, for example, one sensor or a plurality of such sensors configured to detect one or more of pressure, tension, strain, compression, bending, torsion, length change, and mechanical vibration, or both. Also, the sensor structure groups can be configured in different ways, i.e., can have at least partly different sensors, or can provide more or fewer than five sensor structure groups, or both.

[0042] In the first improved configuration of the machine bed 2 shown in FIGS. 1a, 1b, at least one of the sensor structure groups 11-15 has at least one sensor S1-S5 configured to detect mechanical vibration whose frequency matches at least the lowest natural frequency of the machine bed 2.

[0043] FIG. 2 shows a second improved configuration of the machine bed 2 shown in FIGS. 1a, 1b. For the sake of simplicity of the drawing, in FIG. 2, the sensors S1-S5, T1-T5 of the sensor structure groups 11-15 shown in FIGS. 1a, 1b are not shown. Two temperature control conduits 18, 19 are integrated into this machine bed 2', which have ports 18a, 18b, 19a, 19b for the supply and discharge of a medium, for example water, which serves to cool or heat (generally temperature-regulate) the machine bed 2'. Thereby, the machine bed 2' can be cooled or heated by passing a medium through these temperature control conduits 18, 19.

[0044] Instead of, or in addition to, the temperature control conduits 18, 19 illustrated in FIG. 2, the machine bed 2' can be provided with one or more other actuators (not shown), in particular actuators configured to at least partially compensate for or act against the mechanical loads detected by the sensors S1 - S5 of the sensor structure groups 11 - 15. Advantageously, these actuators are connected to a control unit (not shown) by which the actuators are controlled.

[0045] During operation of the machine tool 1, a workpiece (not shown) is attached to a slider (not shown) and processed and / or manufactured by a tool (not shown). In this case, the sensors S1 - S5 of the sensor structure groups 11 - 15 integrated into the machine beds 2, 2' can detect sensor values at least intermittently during one or more of during, before, and after the operation of the machine tool. These sensor values are transferred to an evaluation unit (not shown) and evaluated by that unit. Based on the detected and evaluated sensor values, for example, one or more actuators can be driven such that they at least partially compensate for the detected mechanical loads and / or the detected heat input, or act against them or it. Instead of, or in addition to, this, for example, based on the detected and evaluated sensor values, it is possible to intervene in or stop the operation of the machine tool 1.

[0046] Advantageously, a model analysis of the machine beds 2, 2' is carried out at least once. For this purpose, the machine beds 2, 2' are excited to vibrate by an external excitation, and the natural vibrations of the machine beds 2, 2' are calculated using the sensor values detected by the sensors S1 to S5 of the sensor structure groups 11 to 15. At the same time, the structural response of the machine beds 2, 2' at a reference point, for example, the tool center point TCP, is calculated using another prepared (not shown in the drawing) sensor, for example, a vibration sensor, an acceleration sensor, etc.

[0047] Hereinafter, with reference to FIG. 3, a manufacturing method of the machine beds 2, 2' shown in FIGS. 1a, 1b, and 2 will be described. In the first step 21, a mold (not shown in the drawing) suitable for the machine beds 2, 2' to be manufactured is prepared. In the second step 22, sensor structure groups 11 to 15 each provided with sensors S1 to S5, T1 to T5 are prepared and placed in and / or attached to the mold. In this case, the sensor structure groups 11 to 15 are positioned so that they are at the desired positions of the subsequently completed machine beds 2, 2'. Further, in the second step 22, the holding part 5 is placed in and / or attached to the mold. When deploying an integrated actuator, for example, the temperature control conduits 18, 19 shown in FIG. 2, in the machine bed, in the second step 22, further, the actuator is prepared and attached to the desired position in and / or of the mold.

[0048] Subsequently, in the third step 23, a liquid mineral cast is poured into the mold. After the hardening of the mineral casting or concrete, in the fourth step 24, the mold is removed from the machine beds 2, 2'. In subsequent manufacturing steps and / or assembly steps (not shown in FIG. 3), further, the linear guide parts 4a, 4b can be attached to the upper side 3 of the machine beds 2, 2' to integrate the machine beds 2, 2' into the machine tool 1 or attach other components of the machine tool 1 to the machine beds 2, 2'.

[0049] For example, for the purpose of quality control or process improvement, during the manufacture of the machine beds 2, 2', in particular during the hardening or curing of the mineral cast, the sensor values can be detected at least intermittently by the sensors S1 to S5, T1 to T5. Based on the detected sensor values, at least one optimum value regarding the machine bed can be calculated. This optimum value can be, for example, one or more of the weight, material composition, shape and dimensions of the structural member.

[0050] Within the scope of the present invention, the above-described modification of the machine tool is possible. Thus, it is also possible to provide a machine bed that does not have the holding part 5 and / or the linear guide parts 4a, 4b described in connection with FIGS. 1a, 1b, 2. Instead of or in addition to that, components regarding another structure can be arranged on the machine bed or embedded in the base thereof.

[0051] Even if the present invention has been described based on a machine tool provided with a machine bed, the present invention is not limited thereto. The present invention can be applied to any machine tool provided with a structural member made of mineral cast. Generally, the structural member of the machine tool advantageously serves to position an object to be processed or measured by the machine tool, i.e., a workpiece, as defined with respect to the machine tool. Instead of the above-described configuration of the structural member as a machine bed, for example, the structural member can be configured as a stand, a portal, a spindle suspension, a machine body or a structure similar thereto. Note that although this application relates to the invention described in the claims, it may also include the following configurations as other aspects. 1. A structural member for a machine tool (1), wherein the structural members (2, 2') are made of mineral cast, at least one sensor structure group (11 - 15) is incorporated in the structural members (2, 2'), the sensor structure group (11 - 15) is completely surrounded by the mineral cast, and the structural member has at least one sensor (S1 - S5) for detecting the mechanical load (S1 - S5) of the structural member during operation of the machine tool. 2. The structural member according to item 1 above, wherein the sensor structure group (11 - 15) is configured to detect one or more of pressure, tension, strain, compression, bending, torsion, length change, and mechanical vibration. 3. The structural member according to item 1 or 2 above, wherein the sensor structure group (11 - 15) is configured to detect the mechanical load absolutely. 4. The structural member according to any one of items 1 - 3 above, wherein the sensor structure group (11 - 15) is configured to detect mechanical vibration whose frequency matches at least the lowest natural frequency of the structural member (2, 2'). 5. The structural member according to any one of items 1 - 4 above, wherein the sensor structure group (11 - 15) has at least one temperature sensor (T1 - T5) located at a defined position relative to at least one sensor (S1 - S5) for detecting the mechanical load. 6. The structural member according to any one of items 1 - 5 above, wherein the sensor structure group (11 - 15) is arranged at a predetermined position in the structural member (2, 2'). 7. The structural member according to any one of items 1 - 6 above, further having at least one actuator (17, 18) provided in or incorporated in the structural member (2'). 8. The structural member according to any one of items 1 - 7 above, wherein the structural member is a machine bed. 9. A machine tool comprising the structural member (2, 2') according to any one of items 1 - 8 above. 10. A method for manufacturing a structural member (2, 2') for a machine tool (1), the method comprising the following steps: preparing a mold for the structural member (2, 2'), Providing at least one sensor structure group (11-15) in and / or on the mold, the sensor structure group (11-15) having at least one sensor (S1-S5) for detecting mechanical loads; The method comprising at least pouring a liquid mineral cast into the mold. 11. The method according to claim 10, wherein the sensor structure group (11-15) is provided in and / or at a predetermined position of the mold. 12. The method according to claim 10 or 11, wherein the mold is removed from the structural member (2, 2') after hardening of the mineral cast. 13. During the method, sensor values are at least intermittently detected by the at least one sensor (S1-S5, T1-T5), and based on the detected sensor values, at least one optimum value regarding the structural member (2, 2') is calculated. The method according to any one of claims 10-12. 14. Use of the structural member according to any one of claims 1-8 in a machine tool (1), wherein during operation of the machine tool (1), sensor values are at least intermittently detected by the at least one sensor (S1-S5, T1-T5). 15. Use of the structural member according to claim 14, wherein the natural vibration of the structural member (2, 2') and, simultaneously, the effect of the natural vibration on the tool center point (TCP) of the machine tool (1) are calculated using the detected sensor values.

Claims

1. A structural member for a machine tool (1), wherein said structural member (2, 2') is a machine bed and is made of mineral cast, at least one sensor structure group (11-15) is incorporated in said structural member (2, 2'), said sensor structure group (11-15) is completely surrounded by said mineral cast and has at least one sensor for detecting the mechanical load (S1-S5) of said structural member during operation of the machine tool, said sensor structure group (11-15) is configured to detect one or more of pressure, tension, strain, compression, bending, torsion, and length change, furthermore, said sensor structure group (11-15) is said structural member configured to detect mechanical vibration.

2. The structural member according to claim 1, wherein said sensor structure group (11-15) is configured to detect mechanical load absolutely.

3. The structural member according to claim 1 or 2, wherein said sensor structure group (11-15) is configured to detect mechanical vibration whose frequency matches at least the lowest natural frequency of said structural member (2, 2').

4. The structural member according to any one of claims 1 to 3, wherein said sensor structure group (11-15) has at least one temperature sensor (T1-T5) located at a defined position with respect to at least one sensor (S1-S5) for detecting said mechanical load.

5. The structural member according to any one of claims 1 to 4, wherein said sensor structure group (11-15) is arranged at a predetermined position in said structural member (2, 2').

6. The structural member according to any one of claims 1 to 5, further having at least one actuator (17, 18) provided on said structural member (2') or incorporated in said structural member (2').

7. A machine tool comprising the structural member (2, 2') according to any one of claims 1 to 6.

8. A method for manufacturing a structural member (2, 2') for a machine tool (1), said method comprising the following steps: preparing a mold for said structural member (2, 2'), Providing at least one sensor structure group (11-15) in and / or on the mold, the sensor structure group (11-15) having at least one sensor (S1-S5) for detecting mechanical loads; Pouring a liquid mineral cast into the mold, the method comprising at least: During the method, sensor values are at least intermittently detected by the at least one sensor (S1-S5, T1-T5), and based on the detected sensor values, at least one optimum value for the structural member (2, 2') is calculated.

9. The method according to claim 8, wherein the sensor structure group (11-15) is provided in and / or at a predetermined position of the mold.

10. The method according to claim 8 or 9, wherein the mold is removed from the structural member (2, 2') after hardening of the mineral cast.

11. Use of the structural member according to any one of claims 1 to 6 in a machine tool (1), wherein during operation of the machine tool (1), sensor values are at least intermittently detected by the at least one sensor (S1-S5, T1-T5).

12. Use of the structural member according to claim 11, wherein using the detected sensor values, the natural vibration of the structural member (2, 2') and, simultaneously, the effect of the natural vibration on the tool center point (TCP) of the machine tool (1) are calculated.

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