DE102022203577A1 - Process and device for temperature control and structural element and process for production - Google Patents

Abstract

The invention relates to a method and a device (1) with at least one air bearing (2) and a compressed air supply device (3) which provides compressed air supply for the air bearing (2), the device (1) having at least one temperature control device (5) for setting a Includes temperature of the compressed air supply, as well as a structural element (19) and a method of manufacture.

Description

The invention relates to a temperature control method and a temperature control device with at least one air bearing. The invention further relates to a sandwich structure element and a method for producing such an element.

It is known that mechanical components can have different dimensions and/or shapes at different temperatures. These temperature-related changes in shape and/or dimensions are generally undesirable.

In the field of coordinate measuring technology, temperature fluctuations can lead to structural elements of a coordinate measuring device, for example in a portal or column design, changing their dimensions and/or shape, which in turn can then influence a measurement result. These temperature-related effects on the measurement result are undesirable because they can only be corrected with a relatively large amount of effort or require a complex structure for the coordinate measuring device. One way to avoid temperature-related changes or to keep their effects as small as possible is to massively design structural elements so that they have a large heat capacity. However, this leads to high inertia, which requires a lot of energy when moving structural elements, e.g. to position a sensor. Another approach to compensating for the effects of temperature fluctuations is to correct measurement results by calculation and thus eliminate the temperature-related error. This is complicated and computationally expensive.

Furthermore, there is the problem that local hotspots occur in structures, in which high temperatures are introduced into the structure, for example by electrically operated drive devices or other electrical or electronic components. This leads to locally stronger changes in the structure, which are also undesirable.

It can also be problematic that different materials are installed in structural elements, whereby these can have different heat capacities. Different dimensions of elements of a structure, which cause different thermal capacities, can also lead to temperature changes, in particular in an environment, having different effects on different sections of the structure. This is also undesirable.

Known from the prior art is the DE 689 07 411 T2 , which discloses a high-precision measuring and testing device. Further, this reference discloses fan means to move air through elongate hollow members and thereby achieve an even temperature distribution throughout the device.

Further known is the DE 10 2013 210 821 A1 , which discloses a coordinate measuring machine for measuring workpieces. Furthermore, this publication discloses that fans are provided in a cover, which blow air out of the interior space formed by the cover. Also disclosed is a closed channel through a base frame, columns and a traverse, in which channel air can circulate.

Further known is the DE 400 73 23 A1 , which discloses a coordinate measuring machine with hollow structures in steel construction. It is further disclosed that at least one fan circulates the air within the structure.

Next known from the prior art is the DE 10 2008 024 713 A1 , which discloses a fairing for a machine. Also disclosed is a channel through which heat is transported.

The technical problem arises of creating a device and a method for temperature control of this device as well as a structural element and a method for producing a structural element that enable reliable, uniform temperature control of a mechanical structure.

The technical problem is solved by the subject matter having the characteristics of the independent claims. Further advantageous configurations of the invention result from the dependent claims.

A device is proposed with at least one air bearing and a compressed air supply device, which supplies compressed air for the air bearing. In particular, the compressed air supply device can be connected pneumatically to the air bearing to supply the air bearing with supply compressed air. The device can in particular be a device for measuring coordinates, ie a coordinate measuring device.

The compressed air supply device can provide compressed air supply at a predetermined pressure. It is also possible for the compressed air supply device to clean the air supplied to it and then make it available as compressed air supply.

Air bearings can be used to guide the movements of high- and ultra-precise machine tools and measuring machines, such as coordinate measuring machines, and offer the advantage of almost zero friction and high rigidity of the bearing. Briefly periodic or locally occurring guidance errors can also be compensated for when using certain air bearing types, which advantageously enables homogeneous guidance behavior.

Air bearings are known in various embodiments. In addition to different sizes and different geometries, air bearing devices also differ in the design of the air outlet.

An air layer, which can also be referred to as an air film, can be produced via an air bearing device between two bearing partner elements or bodies, for example between the air bearing device and a carrier body or between an air outlet surface of the air bearing device and a bearing surface of the carrier body. The compressed air introduced between the bearing partner elements forms a kind of lubricating medium and at the same time a pressure cushion for the contact-free absorption of a load. The carrier body can be a structural element of a mechanical structure or a mechanical component.

The air bearing device can in particular be a bearing device or a part of a bearing device which enables a relative movement between the bearing partner elements. The relative movement can in particular be a linear movement. For example, the air bearing device can be part of a linear bearing device. In particular, the air bearing device can be part of a carriage, in which case the carriage can comprise a carriage body. This will be explained in more detail later.

According to the invention, the device comprises at least one temperature control device for setting a temperature of the compressed air supply. The temperature of the compressed air supply can thus be set to a predetermined desired value, ie a desired temperature, by the temperature control device. In particular, the temperature control device can set the temperature of the compressed air supply to an ambient temperature of the device or to a temperature that is higher than the ambient temperature by a predetermined temperature difference. In this case, the temperature control device can heat up the compressed air supply and thus increase a temperature. However, it is also possible that the device cools the supply compressed air and thus lowers the temperature. The temperature control device can include suitable means for heating and/or cooling, for example heating elements and/or cooling elements.

This results in an advantageous manner in that the elements of the device against which the compressed air supply flows after exiting the air bearing are tempered to the temperature of the compressed air supply. In contrast to the temperature control known from the prior art by means of air that is moved by fans, the advantageous result is that no additional installation space is created in devices that already include air bearings to enable movement. Furthermore, due to the fact that the compressed air supply is usually prepared and thus cleaned, contamination of the device by particles transported in the air can be avoided. Furthermore, the temperature of the components can be adjusted with great precision, since the temperature of the compressed air supply can be adjusted in a targeted manner.

In a further embodiment, the device comprises at least one temperature detection device for detecting an ambient temperature, the device being designed to set the temperature of the compressed air supply to the ambient temperature or to a temperature which is higher than the ambient temperature by a predetermined temperature difference. The device preferably comprises a plurality of temperature detection devices for detecting an ambient temperature.
It is possible for the device to include multiple temperature sensing devices placed at different locations to generate location-specific temperature measurements.

This advantageously results in the fact that the undesired effects of local hotspots explained at the outset can also be reduced, since the elements against which the supply compressed air flows are also tempered to the ambient temperature. In particular, heat from the local hotspots can be compensated.

To set the temperature of the compressed air supply, the device can include an evaluation and control device, which can be designed, for example, as a microcontroller or an integrated circuit, or can include such a device. In this case, the temperature detection device can be connected to the control and evaluation device via a signal or data connection. This can then set a target value for the temperature of the compressed air supply to the ambient temperature and control the at least one temperature control device accordingly.

In a further embodiment, the temperature control device tempers the compressed air provided by the compressed air supply device. This can mean that the already cleaned compressed air is tempered with the desired pressure. This advantageously results in the most precise possible setting of the temperature of the compressed air flowing out of the air bearing and thus the most precise possible setting of the temperature of the element on which the flow occurs, since the risk of a temperature change along the flow path is reduced.

Alternatively, the temperature of the air fed to the compressed air supply device to provide the compressed air supply is tempered. In particular, the air can therefore be temperature-controlled before setting a desired pressure and/or before cleaning. This results in an advantageous manner in that there is no pressure change due to a temperature setting of the compressed air supply occurring after the desired pressure has been set, which can have an undesirable effect on the bearing properties of the air bearing.

In a further embodiment, the device comprises a control device which controls the operation of the temperature control device. This has already been explained above in relation to the evaluation and control device, which the control device can form. In particular, the control device can carry out pre-regulation or pre-control.

For example, it can be detected that there is an increase in the ambient temperature, in which case the temperature of the supply compressed air is set to a value which is higher than the current ambient temperature. Of course, it can also be detected that an ambient temperature decreases and the temperature of the supply compressed air can be adjusted to a temperature that is lower than the current ambient temperature. Furthermore, reliable temperature control of the device results in an advantageous manner.

It is also possible for pilot control to take place as a function of future ambient temperatures. These future ambient temperatures may be estimated ambient temperatures. For example, future ambient temperatures can be determined as a function of a (future) time of day and/or weather information and/or other information. For this purpose, in particular before the pre-control or the implementation of the method, e.g. temperatures at certain times of the day, under certain weather conditions and/or when other conditions are present can be recorded and stored, in particular in a mutually associated manner. This assignment can then be evaluated in order to determine a future temperature, in particular at a future point in time. Data mining methods or artificial intelligence processes can be used for this purpose.

If a higher temperature than the current ambient temperature is determined as the future ambient temperature, the temperature of the compressed air supply can be set to a value that is higher than the current ambient temperature. If a lower temperature than the current ambient temperature is determined as the future ambient temperature, the temperature of the compressed air supply can be set to a value which is lower than the current ambient temperature.

The temperature of the compressed air supply can preferably be set as a function of previously known thermal properties, in particular a thermal capacity, of the element of the device against which the flow occurs, in particular in such a way that the element has completely reached the desired setpoint temperature, e.g. the ambient temperature or a temperature, by the future point in time. which is higher than this future ambient temperature by a predetermined amount.

In a further embodiment, the air bearing and the compressed air supply device are pneumatically connected via a connecting element. This connecting element can, for example, be an air line, for example a hose. Furthermore, the device comprises at least one outlet element for the outlet of compressed air supply from the connecting element. The outlet element can be designed as an opening in the connecting element, with air being able to flow out permanently or continuously from this opening. However, it is also conceivable that the outlet element is a controllable outlet element which can be placed in an open state and in a closed state. Such an outlet element can, for example, be a valve, e.g. a solenoid valve. The outlet element, in particular the stated states, can be controlled by the previously explained control device.

Alternatively or cumulatively, the device comprises at least one (additional) pneumatic connection element for connecting the compressed air supply device to at least one outlet element, the outlet element being different from the air bearing. This further connecting element can be guided parallel to the connecting element between the air bearing and the compressed air supply device. In other words includes the device thus has a connecting element for supplying compressed air to the air bearing and a further connecting element which is also supplied with compressed air from the compressed air supply device but is not connected to the air bearing. In particular, this further connecting element can also comprise a plurality of outlet elements.

This advantageously results in the fact that, in addition to the elements that the supply compressed air flowing out of the air bearing flows against, further elements of a mechanical structure can flow against and can therefore be temperature-controlled. If the outlet element is controllable, this temperature control, in particular also the spatial distribution of the temperature control, can be controlled. Another advantageous result is that even hard-to-reach places in a mechanical structure can be temperature-controlled as desired.

Further alternatively or cumulatively, the device comprises a connecting element for fluidic connection with a sandwich structure element according to one of the embodiments described in this disclosure. The device may also include the structural element. The compressed air supply device can thus supply a structural element with temperature-controlled compressed air, which can be a component of a coordinate measuring device, for example.

In a further embodiment, the device is a coordinate measuring machine. If the device is a coordinate measuring device, then guide elements, for example a traverse of the coordinate measuring device, a guide bar for guiding a movement of columns of the coordinate measuring device, and a quill can be temperature-controlled in a targeted manner.

It is possible for a holding device for the air bearing to completely enclose a guide element of the coordinate measuring device, in particular in a projection plane which is oriented orthogonally to a central longitudinal axis of the guide element. Since this prevents the air from escaping quickly from the guide element, the temperature of the guide element adapts more quickly to the temperature of the compressed air supply.

If the device is a coordinate measuring device, a pneumatic connecting element can be guided inside components of a coordinate measuring device, e.g. inside a column, the traverse or the quill, but also behind cladding parts of the coordinate measuring device.

This advantageously results in rapid and reliable cooling of the temperature of components of a coordinate measuring device, which ensures high accuracy and quality of the measurement results.

In a further embodiment, a control device of the coordinate measuring device forms the control device for the temperature control device. The control device of the coordinate measuring device can, for example, control the movement of moving parts of the coordinate measuring device, in particular for positioning a sensor. The control device can also process output signals from a sensor for the coordinate measuring device, for example in order to generate measurement data.

This advantageously results in reliable temperature control with a reduced number of elements required for this purpose, in particular since existing control devices can be used to control the temperature control device.

A method for temperature control of a device with at least one air bearing and a compressed air supply device according to one of the embodiments described in this disclosure is also proposed.

According to the invention, the temperature of the compressed air supply is set to a target temperature by means of the temperature control device. In this case, the method can be carried out with a device according to one of the embodiments explained in this disclosure. Thus, the device is configured to carry out such a method.

Compared to the prior art, it is advantageous that no temperature control takes place via the air circulated by fans, which on the one hand reduces the risk of contamination of the elements that are temperature-controlled by the air. Heat input from the fans can also be avoided, as well as vibrations that can impress the mechanical structure, for example the coordinate measuring machine, due to the fan rotation. Furthermore, it is advantageously the case that materials with rather low thermal conductivity, such as ceramics, can also be used for structural elements, since corresponding elements can be temperature-controlled reliably and quickly.

In particular, it is possible to adapt the temperature of a mechanical structure to the ambient temperature in a short adaptation phase. The tempering of the mechanical structure is also less dependent on the Thermal conductivity of the material of the elements of the mechanical structure. It is also possible to ensure that very different thermal capacities are compensated for more quickly in terms of time, as a result of which, for example, reduced or shortened bimetallic effects can be achieved. The invention also achieves the goal of achieving fewer structural deformations, which, for example in a coordinate measuring device, can cause rotational errors that are difficult to correct.

A sandwich structure element is also proposed, which can in particular be an element of a mechanical structure. The proposed structural element can in particular be a component of a mechanical or kinematic structure of a coordinate measuring device. For example, the structural element can form the quill, the traverse and/or a guide bar of the coordinate measuring device completely or at least in part. The structural element can also form a thermal barrier element.

The sandwich structure element can be designed as a composite element. The sandwich structure element comprises a first layer made from a first material and at least one further layer made from a further material. The further material is different from the first material. A layer can also be referred to as a partial element of the structural element.

It is possible that the structural element comprises, for example, a second layer made of a second material and at least a third layer made of the second material or a third material. In this case, the second material can be different from the first material. Furthermore, the third material can be different from the second material. The third material can also be different from the first material.

The first material may have a bulk modulus that is higher than the bulk modulus of the other, e.g. the second and/or third, material. Furthermore, the tensile strength of the other material, e.g. the second and/or the third material, can be greater than the tensile strength of the first material. Furthermore, a density of the first material can be lower than a density of the further material, ie the second material and/or the third material. With the same volume, the first material is lighter than the other material.

Furthermore, at least part of the first layer is comprised by the further layers. For example, the first layer can be completely encompassed by the further layer. At least one side face of the first layer, but preferably at least two side faces of the first layer, can also be covered by the further layer. It is also possible for the first layer to be completely surrounded by the further layer in a common plane of projection, which is oriented perpendicular to a central axis of symmetry of the first layer. In other words, side or lateral surfaces of the first layer can be covered by the further layer. End faces can also be covered, but this is not mandatory.

It is also possible for at least part of the first layer to be arranged between the two further layers, which can both be formed from the further material or from the second and third material, for example. It is also possible for the first layer to be arranged completely between the two further layers.

In this case, the first and the further layer can be connected to one another, in particular in such a way that the layers are connected in a shear-resistant manner. Possible types of connection are gluing, laminating, welding and/or other types of connection.

According to the invention, the first material is a fluid-permeable material. The fluid-permeable material can be a material that can be flown through over a surface or volume. In particular, the fluid-permeable material can be a porous material, for example a porous metal, in particular aluminium. For example, it is therefore possible for the fluid-permeable material to be a material with a predetermined porosity and/or a predetermined particle size, which is selected in such a way that at least one predetermined property of the fluid flowing out of the outflow section, for example a flow rate and/or a volume flow, can be provided by the material. The further material can be fluid-impermeable or fluid-permeable.

According to the invention, the fluid-permeable material is a fluid-permeable graphite or a fluid-permeable carbon fiber reinforced plastic or a combination of these materials.

This advantageously results in a sandwich structure element being provided with an intermediate layer, ie the first layer, which has a high compression modulus, the intermediate layer and thus the structure element having a high thermal conductivity and being particularly suitable for a fluid to flow through .

In particular, this results in a temperature-controlled structural element, the intermediate layer of a fluid can be flown through, which in turn can be used to set a desired temperature of the structural element. The fluid is preferably, but not necessarily, air.

In particular, a fluid with a temperature set to a desired value can flow through the structural element, as a result of which the structural element or at least part of it is also set to the desired temperature. Furthermore, the structural element has desired mechanical properties, for example a desired rigidity and/or a desired tensile strength and/or a desired strength.

Setting a desired temperature results in an advantageous manner in that the deformation of the structural element caused by temperature fluctuations can be minimized.

The fluid-permeable material can be a sintered material. A sintered material refers to a material produced by sintering. However, in addition to sintering, the production process can also include other process or production steps. For example, the sintered material may be a sintered ceramic material or a sintered metal material. Since sintering processes are established production processes, the fluid-permeable material can be produced simply and reliably with desired, in particular predetermined, properties, e.g. a desired porosity and/or grain size.

Alternatively, the fluid permeable material may be a cast material. A cast material refers to a material produced by a casting process. In this case, the manufacturing process can, in addition to casting, also include other process or manufacturing steps. For example, the casting material may be a metal material. For example, this can be cast into a desired shape with a stent material, e.g., a crystal salt, with the stent material being removed after casting, e.g., by washing. Since casting processes are established production processes, the fluid-permeable material can also be produced easily and reliably with desired, in particular predetermined, properties, e.g. a desired porosity and/or grain size.

Further alternatively, the fluid permeable material may be a foam material. A foam material refers to a material produced by (up) foaming. In this case, the production process can, in addition to (up)foaming, also include further process or production steps. For example, the foam material can be a metal material, whereby a metal foam can be produced. Corresponding manufacturing processes, ie processes for (up)foaming, are known to the person skilled in the art. Since foamed materials advantageously have a low weight and high breaking strength, the weight of the structural element can also be reduced and its breaking strength increased.

It is conceivable that the structural element is arranged in a fluid-tight protective element, for example a bellows. This can prevent fluid flowing out of the structural element from flowing into an environment. Rather, this can flow into an interior volume encompassed by the protective element and can then be used further.

A machine, in particular a coordinate measuring machine, which is completely or partially formed from one or more proposed structural elements, is also described. The machine can also be a robot or some other positioning device.

In a further embodiment, the structural element has or forms at least one connection device for supplying fluid to at least the first layer. For example, this connection device can be designed as a channel or comprise such a channel or enable a fluidic connection to the channel, with the channel being arranged in the first layer. Thus, the channel can be delimited by the first material. It is possible that part of a boundary surface of the channel formed by the first material is sealed.

It is of course possible for the structural element to also have at least one connection device for draining fluid from the first layer and/or from the further layers.

The connection device can in particular be arranged and/or designed in such a way that a reliable supply of fluid to desired areas of the first layer is ensured. In this way, in particular, a fluid distribution that is as uniform as possible in the first layer and thus also in the further layers connected to the first layer can be ensured, which in turn can ensure uniform temperature control.

The connection device can be designed for the mechanical attachment of a fluid connection element, for example a hose, with a fluid-technical, for example pneumatic, Ver bonding between the first layer and the connecting element is established when the connecting element is mechanically fastened to the connection device.
The structural element can also have a number of connection devices for supplying fluid to different sections of the first layer.

The connection device(s) can/can be used to connect the structural element fluidically to a compressed air supply device for providing compressed air for air bearings. This compressed air supply can be tempered to a desired setpoint.

In a further embodiment, the structural element comprises at least one temperature control device for setting a desired temperature of the fluid. This temperature control device can be designed, for example, as a heating and/or cooling device. However, the structural element is preferably supplied with fluid that has already been temperature-controlled to a desired value, e.g. from fluid that has been temperature-controlled by an external temperature-control device. For example, the supplied fluid can be supply compressed air, which is provided by a compressed air supply device for providing compressed air for at least one air bearing and which is temperature-controlled by a corresponding temperature control device, e.g. by an air conditioning unit.

It is of course possible for the structural element to comprise at least one fluid guide means and at least one fluid pump. This advantageously results in the temperature of the fluid flowing through the first layer being able to be set to a desired target value, which in turn means that a desired temperature of the structural element can be set and kept constant.

In a further embodiment, the structural element comprises at least one insulating layer, this insulating layer being arranged on the side of the second layer facing away from the first layer. The insulating layer can be mechanically connected to the second layer. The insulation layer can have predetermined (thermal) insulation properties. In this case, the insulating layer can be formed from a material which is different from the first material and/or the further material. In particular, a thermal conductivity of the material of the insulating layer can be greater than that of the first material and/or the further material.

This advantageously means that the temperature of the structural element can be kept constant more simply, reliably and with little energy consumption, since the temperature of the first layer set by the fluid and the temperature of the second layer resulting from this tempering are kept as constant as possible by the insulating layer because the transfer of thermal energy from the second layer is reduced or minimized by the insulating layer.

In a further embodiment, the insulating layer is fluid-permeable. In particular, the insulating layer can be formed from a material which has a corresponding grain size and/or a corresponding porosity. This makes it possible in an advantageous manner for the fluid to also flow through the insulating layer, as a result of which in particular a discharge/removal of the fluid supplied through the first layer is made possible. If, in particular, the further layer is also designed to be fluid-permeable or if the further layer has at least one fluid connection between the first and the insulating layer, fluid can flow through the first layer into the structural element and then flow out through the insulating layer.

However, it is also conceivable that the insulating layer is impermeable to fluids.

This advantageously results in temperature control of the structural element that can be implemented in a simple manner by means of a fluid flowing through it.

In a further embodiment, the structural element comprises at least one temperature control device. This can be different from the temperature control device for the fluid. The temperature control device can be designed as a heating and/or cooling device. This can be used to adjust a temperature of at least one section of the structural element, in particular the first layer and/or the further layer. The temperature device can be arranged accordingly for this purpose.

Alternatively or cumulatively, the structural element comprises at least one temperature detection device. A temperature of at least one section of the structural element can be detected by this.

For example, an additional temperature control device can be arranged in such a way that the temperature of a selected section of the structural element can be adjusted in a targeted manner, with the temperature of this section not being possible or not being possible to the desired extent via the fluid temperature control.

This advantageously results in the temperature of the structural element being set as uniformly as possible and thus in a further reduction in undesired deformation.

Furthermore, a temperature of the fluid can be set as a function of the temperature detected by the temperature detection device.

For example, an evaluation and control device, which may be in the form of a microcontroller or integrated circuit or may include such a device, a deviation between a setpoint and an actual value detected by the temperature detection device can be determined, with the temperature of the Fluid, in particular by means of the temperature control device for the fluid, is adjusted in such a way that a deviation between the setpoint and the actual value is reduced. Depending on the detected temperature, the at least one temperature device explained above can also be controlled accordingly.

It is possible for the sandwich structure element to include a plurality of temperature detection devices that detect temperatures in different sections, for example evenly distributed sections, of the structure element. The temperature detection devices can also be arranged in such a way that they can detect a temperature in a section whose temperature can be set by the temperature control device explained above.

This results in an advantageous manner in that the most uniform possible temperature control of the structural element is made possible.

• - Bereitstellen einer ersten Schicht aus einem ersten Material,
• - Bereitstellen mindestens einer weiteren Schicht aus einem weiteren Material,
• - Verbinden der ersten und der weiteren Schicht derart, dass die weitere Schicht die erste Schicht zumindest teilweise umgibt.

Also proposed is a method for producing a sandwich structure element, comprising the steps:

• - providing a first layer of a first material,
• - providing at least one further layer of another material,
• - Connecting the first and the further layer in such a way that the further layer at least partially surrounds the first layer.

According to the invention, the first material is a fluid-permeable material, the fluid-permeable material being a fluid-permeable graphite or a fluid-permeable carbon-fibre-reinforced plastic or a combination of these materials.

It is possible that the first layer is provided by an additive manufacturing process. An additive manufacturing method can in particular be a selective laser sintering method or a fused deposition modeling method. Of course, other additive manufacturing processes are also conceivable. As a result, the setting of a desired porosity and thus of the through-flow property of the first material can be made possible as early as during production. It may be necessary to rework the first layer after such production, e.g. polishing, which can be done using suitable polishing agents, e.g. a cloth. As a result, the production, in particular of complex structures, of the first layer can be simplified in an advantageous manner.

Alternatively, it is also conceivable to provide all layers by an additive manufacturing process.

This advantageously results in the production of a sandwich structure element described in the disclosure with the technical advantages also described. In particular, the method can therefore include the steps that are necessary to produce a structural element described in this disclosure.

• 1 ein schematisches Blockschaltbild einer erfindungsgemäßen Vorrichtung,
• 2 ein schematisches Flussdiagramm eines erfindungsgemäßen Verfahrens,
• 3 einen schematischen Querschnitt durch ein erfindungsgemäßes Sandwich-Strukturelement,
• 4 einen schematischen Querschnitt durch ein erfindungsgemäßes Sandwich-Strukturelement gemäß einer weiteren Ausführungsform, und
• 5 einen schematischen Querschnitt durch ein erfindungsgemäßes Sandwich-Strukturelement gemäß einer weiteren Ausführungsform.

The invention is explained in more detail using exemplary embodiments. The figures show:

• 1 a schematic block diagram of a device according to the invention,
• 2 a schematic flow chart of a method according to the invention,
• 3 a schematic cross section through a sandwich structure element according to the invention,
• 4 a schematic cross section through a sandwich structure element according to the invention according to a further embodiment, and
• 5 a schematic cross section through a sandwich structure element according to the invention according to a further embodiment.

In the following, the same reference symbols designate elements with the same or similar technical features.

1 shows a schematic block diagram of a device 1 according to the invention with air bearings 2 and a compressed air supply device 3 which provides compressed air supply for the air bearings 2 .

The device 1 also includes temperature detection devices 4 which are designed, for example, as temperature sensors and include an ambient temperature of the device 1 .

It is also shown that the device 1 comprises a temperature control device 5 designed as an air conditioning unit, which is used to set the temperature of the compressed air supply.

It is shown here that the compressed air supply provided by the compressed air supply device 3 flows to the temperature control device 5, which then adjusts the temperature of the compressed air supply to a predetermined target value. The compressed air supply also flows to air bearings 2 which are arranged in holding devices 6 , these holding devices 6 enclosing guide elements 7 . The guide elements 7 are components of a coordinate measuring device, in particular a traverse 8 , a quill 9 and a guide bar 10 which is arranged on a measuring table 1 . It is possible for the compressed air supply to be routed via connecting elements 12, e.g. hoses, some of which are arranged inside components of the coordinate measuring device, for example inside a column element. It is possible here for these connecting elements to include outlet elements for the outlet of compressed air supply. Air branching devices 13 are shown, which distribute the compressed air provided by the compressed air supply device 13 to the individual air bearings 2 .

Alternatively or cumulatively, it is possible that in addition to the connecting elements 12, which connect the temperature control device to the air bearings 2, additional (not shown) connecting elements are present, which are not used to supply an air bearing 2, but to guide the temperature-controlled compressed air supply to desired sections a mechanical structure, in particular a coordinate measuring device.

2 shows a schematic flow chart of a method according to the invention. Here, in a first step S1, an ambient temperature is detected. In a second step S2, the compressed air supply provided by the compressed air supply device 3 is then set to the value of the ambient temperature.

3 shows a schematic cross section through a sandwich structure element 19 according to the invention. This structure element 19 comprises a first layer 20 made of a first material and a second layer 21 made of a further material. It is also shown that the further layer 21 completely surrounds the first layer, at least in a projection plane which is oriented perpendicular to a central longitudinal axis of the structural element 19, the central longitudinal axis being oriented perpendicular to the plane of the drawing. The structural element 19 also includes an insulating layer 22 which is arranged on the side of the second layer 21 opposite the first layer 20 . The insulating layer 22 encompasses the further layer 21 completely or at least in the said projection plane.

It is also shown that the first material is a fluid-permeable material, this being a fluid-permeable graphite or a fluid-permeable carbon fiber-reinforced plastic or a combination of these materials.

In particular, a fluid can be introduced into the structural element 19 by flowing into the first layer 20, in particular via a suitable interface. The first layer 20 can be flowed through by the fluid. If the fluid has a desired setpoint temperature, which was set, for example, by a temperature control device for setting the temperature of the fluid, a temperature of the structural element 19 that is as uniform as possible can advantageously be set. Furthermore, due to the mechanical and thermal properties of the first material, this structural element 19 has the desired mechanical properties of a composite element.

4 shows a schematic cross section through a structural element 19 according to the invention according to a further embodiment. In contrast to the in 3 In the embodiment illustrated, the structural element 19 has a circular cross section, with the in 3 illustrated embodiment of the structural element 19 has a rectangular or square cross section. Also shown is a feed channel 23 which is arranged in the first layer 20 and runs through it. This channel 23 is completely surrounded by the first material of the first layer 20 . Also shown are sealed portions 24 of a boundary surface of channel 23 formed by the first layer. Between the sealed sections 24, which can be formed by a layer of lacquer 24 or a layer formed by an adhesive, through-openings 25 are arranged, which fluidically connect the first material to the channel 23. At a free end of the channel 23 (not shown), a connection device for supplying fluid can be arranged, which can be connected, for example, to a fluid-carrying means, such as a fluid line. Fluid can thus be fed into the channel 23 through these, the fluid then flowing through the passage openings 25 from the channel 23 into the first material of the first layer 20 . The fluid can then flow out of the first material at the first end explained above or at a further section. This can be done via an ent speaking connection device (not shown) take place.

It is possible for the dimensions of the passage openings to change along the longitudinal axis of the channel 23, in particular in such a way that a uniform temperature control is achieved despite the changing fluid pressure along the channel 23.

5 shows a schematic cross section through a structural element 19 according to the invention in a further embodiment. The first layer 20, the further layer 21 and the insulating layer 22 are again shown. A supply channel 23 for fluid supply is also shown, a fluid being supplied through this channel 23, for example via a corresponding connection device. This is symbolized by an arrow 26 . It is shown that the further layer 21 is designed as a lattice, with the sections of the first layer 21 being arranged in cavities in the lattice.

The fluid can then flow out of the channel into the first material through grid openings (not shown) and flow out of the first material through the further material of the further layer 21 and the material of the insulating layer 22 out of the structural element 19 . For this purpose, the further material and the material of the insulating layer 22 are also designed to be fluid-permeable and/or have corresponding openings.

Reference List

1

contraption

2

air bearing

3

compressed air supply device

4

temperature detection device

5

temperature control device

6

holding device

7

guide element

8th

traverse

9

quill

10

guide bar

11

measuring table

12

fastener

13

branch point

19

structural element

20

first layer

21

another layer

22

insulation layer

23

channel

24

sealing layer

25

passage opening

26

Arrow

S1

first step

S2

second step

S3

Third step

S4

fourth step

S5

fifth step

S1

first step

S2

second step

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 68907411 T2 [0006]
• DE 102013210821 A1 [0007]
• DE 4007323 A1 [0008]
• DE 102008024713 A1 [0009]

Claims (15)

Device with at least one air bearing (2) and a compressed air supply device (3) which provides compressed air supply for the air bearing (2), characterized in that the device (1) comprises at least one temperature control device (5) for setting a temperature of the compressed air supply. device after claim 1 , characterized in that the device (1) comprises at least one temperature detection device (4) for detecting an ambient temperature, the device (1) being designed to reduce the temperature of the compressed air supply to the ambient temperature or to a temperature which is higher by a predetermined temperature difference than the ambient temperature is to be set. Device according to one of the preceding claims, characterized in that the tempering device (5) tempers the compressed air provided by the compressed air supply device (3) or tempers the air supplied to the compressed air supply device (3). Device according to one of the preceding claims, characterized in that the device (1) comprises a control device which controls the operation of the temperature control device (5). Device according to one of the preceding claims, characterized in that the air bearing (2) and the compressed air supply device (3) are pneumatically connected via a connecting element (12), the device (1) having at least one outlet element for the outlet of compressed air supply from the connecting element (12 ) comprises and / or wherein the device (1) comprises at least one further connecting element with at least one outlet element and / or wherein the device (1) comprises a connecting element for connection to a sandwich structure element (19) according to one of claims 9 until 14 includes. Device according to one of the preceding claims, characterized in that the device (1) is a coordinate measuring machine. device after claim 6 , characterized in that a control device of the coordinate measuring device forms the control device for the temperature control device (5). Method for temperature control of a device (1) according to one of Claims 1 until 7 , characterized in that by means of the temperature control device (5), the temperature of the compressed air supply is set to a desired temperature. Sandwich structure element comprising a first layer (20) made of a first material and at least one further layer (21) made of a further material, wherein at least part of the first layer (20) is comprised by the further layers (21), characterized that the first material is a fluid-permeable material, wherein the fluid-permeable material is a fluid-permeable graphite or a fluid-permeable carbon fiber reinforced plastic or a combination of these materials. sandwich structural element claim 9 , characterized in that the structural element (19) has or forms at least one connection device for fluid supply at least to the first layer (20). sandwich structural element claim 9 or 10 , characterized in that the structural element (19) comprises at least one temperature control device for setting a temperature of the fluid. Sandwich structural element according to one of claims 9 until 11 , characterized in that the structural element (19) comprises at least one insulating layer (22), the insulating layer (22) being arranged on a side of the second layer (21) facing away from the first layer (20). sandwich structural element claim 12 , characterized in that the insulating layer (22) is fluid-permeable. Sandwich structural element according to one of claims 9 until 13 , characterized in that the structural element (19) comprises at least one temperature control device for setting a temperature of at least one section of the structural element (19) and/or at least one temperature detection device. Method for producing a sandwich structure element (19), comprising the steps: - providing a first layer (20) made of a first material, - providing at least one further layer (21) made of a further material, - connecting the first and the further layer (20, 21) such that the further layer (21) surrounds the first layer (20) at least partially, characterized in that the first material is a fluid-permeable material, the fluid-permeable material being a fluid-permeable graphite or a fluid-permeable carbon fiber reinforced plastic or a combination of these materials.

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