DE10262278B4 - insert module - Google Patents

Abstract

An insert module (119) is used to attach a tool holder (22) for a machine tool (21) to a base module (17) of a device for producing a machine tool, which is provided with a receptacle for the insert module. The outer dimensions of the insert module (119) are adapted to the dimensions of the receptacle for the insert module. The insert module has a cone receptacle for receiving a fastening cone (24) of the tool holder. The insert module (119) has a thermally insulating structure which includes thermal insulation between a tool holder (22) inserted in the insert module and the basic module (17) that receives the insert module. In one embodiment, the insert module has an inner insert (121) made of plastic that is seated in an outer shell (123) made of metal.

Description

Field of application and state of the art

The invention relates to an insert module for attaching a tool holder of a machine tool to a provided with a receptacle for the insert module basic module of an apparatus for producing a machine tool. Such insert modules are intended for use in a method and apparatus for making a machine tool that includes a tool holder having a tool holder opening and a tool clamped into the tool holder opening by a manufacturing fixture method.

Such methods and devices for producing a machine tool are, for example, in the DE 100 25 007 A1 or the DE 101 24 275 A1 described. It is a manufacturing process for a machine tool, which consists for example of a tool holder with a receiving cone and the actual tool, such as a cutter or drill. The tool is mounted in a tool holder opening, for example thermally shrunk.

The aim of the manufacturing process is to produce a machine tool on the one hand. On the other hand, for example, for processing machines with which a longitudinal position of the machine tools can not be corrected, for. B. in multi-spindle machines, a machine tool can be brought to a defined nominal size.

So far, it is not exactly reproducible to bring, for example, thermally shrunk machine tools with sufficient accuracy to a defined nominal size. The problem here is the thermal expansion of the tool holder and the tool. When measuring the length of the machine tool during shrinkage is usually measured in the hot state when the machine tool is thermally expanded. After cooling, so for the subsequent processing operation, the machine tool contracts again and thus becomes shorter.

Furthermore, combined measuring and shrinking devices are known in which a single tool holder for the machine tool to be produced has both an optoelectronic measuring device with illumination source, video camera and connected image processing and also an inductive shrinking device. Similar bones are for example from the DE 100 15 322 A1 known.

It is further known to use empirically determined correction values in which the length expansions and corresponding length errors observed in certain combinations of tool and tool holder, usually as a single correction value, are recorded on paper. These correction values can be taken into account when shrinking a machine tool in order to bring the machine tool to a desired nominal dimension. However, this technique does not result in reproducible results with the required accuracy due to changes over time in both the shrinkage and the expansion behavior of the machine tool.

Insertion modules intended for such methods in such devices are usually made of solid metal.

Task and solution

The invention has for its object to provide an insert module of the type mentioned, which allows the thermal shrinking a length adjustment of a machine tool repeatable with sufficient accuracy.

This object is achieved by an insert module having features of claim 1. Advantageous further developments are specified in the dependent claims. The wording of all claims is incorporated herein by reference.

For receiving a tool holder on the device, an insert module is provided on or in which the tool holder is inserted. This can be done for example with a mounting cone on the underside of the tool holder, wherein the insert module has a correspondingly formed cone seat. On the device itself may be provided a basic module, in which the insert module can be used. Thus, by means of various insert modules, a substantially arbitrarily formed tool holder can be attached to a base module. It is advantageously provided that the tool holder or a reference point of the tool holder, for example, a bottom or a flange, are in a known position to the device. This makes it possible to ensure that setpoint values calculated by the device or the basic module are correct.

A disadvantage of insert modules made of solid metal is that a heat input from the tool holder into the device can lead to Messwertverfälschungen.

The insert module according to the invention also serves for attaching a tool holder of a machine tool to a provided with a receptacle for the insert module basic module of a device for producing a machine tool. The outer dimensions of the insert module are adapted to the dimensions of the recording of the basic module. The insert module has a cone seat for receiving a mounting cone of the tool holder. According to the invention, the insert module has a thermally insulated structure which comprises a thermal insulation between a tool holder inserted in the insert module and the base module receiving the insert module.

A thermal insulation or insulation should be provided between a tool holder used in the insert module and the base module. This is possible, for example, by a layer structure comprising a plurality of alternately provided layers of metal and thermally insulating material, for example ceramic or plastic. The thermally insulating material should advantageously meet certain requirements for strength and thermal insulation. Although such a construction for thermal insulation requires certain compromises in the precision of the insert module. But especially for the production of machine tools interfering thermal influences can be kept away from the basic module and the device.

The insert module can be used in all conventional shrinking processes. Special advantages arise during thermal shrinkage.

A particularly advantageous method has the following steps.

A reference machine tool is selected which is either identical to the machine tool to be produced. Alternatively, it may also be similar or identical. This means that a reference clamping procedure can be performed either for specific combinations of tool or tool holder or for certain types or assemblies.

Subsequently, the reference tensioning process is performed on the reference machine tool. For this purpose, at least one predefinable reference tensioning process parameter, for example time or temperature or temperature profile, is specified.

During the reference tensioning process, a dimensional change occurring or caused on the reference machine tool, which is time-dependent, is detected. From this, a time-dependent dimension function representing the time course of the dimensional change is generated. Advantageously, this time-dependent dimension function is a curve. Then the dimension function or the curve is saved. Thus, a dimension function is obtained which can be used to influence or correct further manufacturing fixturing methods, in particular using the same reference fixture method parameters. Thus, a manufacturing fixture method, either for the same combination of the machine tool or for machine tools of the same type or subassembly, can be controlled according to the time-dependent dimension function. Such detection and storage may also be referred to as "recordening".

The big advantage of capturing a time-dependent dimensional change and the resulting time-dependent dimension function is that it causes a dimensional change at all times. Thus, in the manufacturing tensioning process, time constraints or constraints are essentially free.

Reference data representing the reference fixture parameters as well as the reference fixture tool are advantageously stored. This can be done in a reference data store. It is particularly advantageous to store corresponding reference data for a plurality of different combinations of reference tensioning process parameters and reference machine tools. In particular, for different reference machine tools, different types of reference tensioning process parameters, such as duration or temperature, are different for thermal shrinking. Furthermore, as reference machine tools previously mentioned different combinations of identical, similar as well as type or module-like tools and tool holders can be used.

As a time-dependent dimension of a machine tool, a spatial coordinate is advantageously used, in particular the position of a specific point of the machine tool along an axis of a spatial coordinate system. Advantageously, a corner or edge is used, for example the tip of the machine tool in the case of a drill or an edge of the tool in the case of a milling cutter. Preferably, the length of the machine tool is monitored or adjusted, for example, to the tip of a drill. It can also be a lateral deviation, for example due to the nature or structure of the tool or the tool holder, monitored and corrected later.

A manufacturing tensioning process performed after performing a reference tensioning process may include the following steps.

A machine tool to be produced is measured during the manufacturing tensioning process. In this case, a time-dependent current measured value M _is a dimension, advantageously a spatial coordinate determined. This dimension corresponds to the dimension or space coordinate used for the reference tensioning method to be used for this machine tool.

The current measured value M _ist is corrected with corresponding values M _{ref of} the time-dependent dimension function from the memory, the correction taking place in the correct time, ie in real time or continuously. As a result, compensated measured values M _{komp are} generated. The compensated measured values M _komp are displayed.

Thus, it is possible to establish a relationship between a reference tensioning method and the detailed manufacturing tensioning method. For this purpose, for example, both the dimension function and an actually measured curve of the current measured values M _{are played} simultaneously, ie synchronously. One possibility for a time-correct correction of the current measured values M _ist is a subtraction with M _comp = M _ist - M _ref . This means that the compensated and displayed measured value M _comp in this _exemplary embodiment corresponds to the value to which the machine tool must be set at exactly this point in time as a result of the time accuracy. After completion of the manufacturing tensioning process, a target value M set _{to be set} for the machine tool is obtained.

An adjustment of the machine tool during the manufacturing-tensioning process can be carried out such that adjusting means are provided which engage the tool and this move or adjust relative to the tool holder. As stated previously, can be adjusted via the adjusting means that the compensated measured value M _komp an adjusted setpoint value M corresponds _to the machine tool.

The adjusting means can basically be designed in a variety of forms. Advantageously, they are designed for a fixation of the tool in a set position. For this they can for example hold the tool directly or support. The reference tensioning process parameters may contain information about the actuating means. Likewise, the influence of a heating of the adjusting means may be provided in the dimension function.

In a further embodiment of the invention, it is possible to form the actuating means electromechanically. This makes it possible to make an automatic adjustment of the measured value M _ist or of the compensated measured value M _comp to the setpoint M _soll , which does not require the intervention of the operator. This has the advantage that a setting can be made on the one hand quickly and with little effort, and on the other hand without human error. Advantageously, the setpoint M _is predetermined, for example, as the total length of the machine tool. By means of the adjusting means by hand or automatically the measured value M _is set to it, wherein the setting on the displayed value M _comp with the corresponding calculation formula takes place.

As a manufacturing-tensioning method, a shrinkage of the tool in the tool holder opening of the tool holder is advantageously carried out. Particularly preferred is a thermal shrinking with a heating process. In this case, the tool holder or a chuck of the tool holder, in which the tool is inserted, is heated. The heating is particularly advantageous during thermal shrinkage by inductive coupling of energy.

Mechanical shrinking, for example with hydraulic expansion chucks or thermal shrinkage, may also be used. It is known to those skilled in the art and need not be explained in detail here.

If the time-dependent dimension function is detected during the reference tensioning process, interference may occur during detection. These may be, for example, jumps of the dimension or of a measured value, which can arise due to sudden release of a frictional connection between the tool and the tool holder with a drop of the tool in the tool holder. They have to be corrected. This correction can be made on the one hand before or during the saving, on the other hand only after saving.

For the correction, a disturbance is advantageously detected, for example, as an unexpected change of the dimension function or its slope exceeding a specific limit value. For example, in the case of a sudden drop in the dimension function or its curve by a certain value, this drop can be recognized and evaluated. Subsequently, from the time of the disturbance, the subsequent section of the dimension function or its curve is corrected or raised by just the value of the waste. This is advantageous an absolute change of the dimension function. Here it is possible to specify certain vertices that are relevant to the dimension function to be detected must apply. For example, this may be a rough predetermination of the course to be expected or even the requirement that no sudden jumps may occur. These presets can be used when correcting the dimension function.

A detection of the dimension or a measured value in the reference tensioning method and the current measured value M _is advantageously carried out optically by optically detecting and measuring a specific point of the tool. This can be done, for example, with a lateral projection of the silhouette of the tool on an image recording device.

In a further embodiment, it is possible to detect a plurality of dimensions or a plurality of measured values M _{ist and} to use them for setting in a production tensioning method. This can be, for example, both length and lateral deviation of a machine tool.

Advantageously, the detection of the dimension or the measured value M _{is carried out} at time intervals which are less than one second, preferably about 0.2 seconds. This ensures a sufficiently accurate detection over time. It is also possible to make the time intervals even smaller or narrower for a real-time view.

It is possible to store multiple time-dependent dimension functions for different combinations of reference machine tools. If necessary, a suitable dimension function can then be used in each case. This storage can be done on the one hand at the user of a correspondingly equipped device for existing concrete machine tools or combinations of tools with tool holders. Alternatively, it is possible to carry out a large number of dimensional functions for predetermined machine tools or combinations of specific tools with specific tool holders of predetermined types or assemblies at the factory when setting up the device. Such sets of dimension functions can be used after a single acquisition for a variety of devices and save the operator the great expense of their own measurements.

A device suitable for carrying out the method has a measuring device for detecting a time-dependent dimensional change caused by a reference clamping method while specifying at least one predefinable reference-clamping method parameter on a reference machine tool. The specification of the reference fixture parameter serves to ensure that a fabrication fixture method exactly matches the reference fixture method from the process parameters.

Furthermore, a controller is provided in which a time-dependent dimension function representing the time course of the dimensional change is generated.

The time-dependent dimension function is stored in a data memory that can be specially designed for this purpose. So it is available for further operations.

Furthermore, a receptacle for a machine tool is provided, as well as a clamping device with which the tool can be loaded and unloaded into the tool holder using the manufacturing clamping method.

This device is advantageously suitable for carrying out a method with one or more of the aforementioned features. In this respect, reference is made to the above statements in addition, which also describe features and the use of the device. The device may include a reference data store in which reference data is stored. The reference data may represent the reference fixture parameters, the reference machine tool, or indicia information. It is also possible to use the reference data store as a data store to store the time-dependent dimension function. So only one data store is needed.

Advantageously, a control is provided, with which the production-tensioning method is controlled in accordance with selected, aforementioned reference data. For example, temperature and time or temporal temperature profile as well as machine tool data can be used as reference data.

Furthermore, the controller for correcting the time-dependent dimension function during the reference tensioning method may be formed by disturbances, such as jumps in the dimension or the measured value. This correction can, as previously mentioned, occur before, during or after the storage. In this case, the controller can detect a disturbing influence or a fault directly, which is noticeable by an unexpected change in the dimension function. By correcting the dimension function, such as moving a portion of the dimension function, the perturbation can be eliminated and the dimension function, so to speak, conditioned.

The controller may be configured such that it _is the current measured values with corresponding M Values M _{ref of} the time-dependent dimension function corrected. The correction enables compensated measured values M _{komp to be} generated. A simple type of such a time-accurate correction, as described above, a subtraction with M _comp = _M - M _ref. The compensated measured value M _komp can be displayed, for example with a corresponding screen or a display.

The measuring device detects at least one measured value M _is a dimensional change of the machine tool. This advantageously takes place via optical detection, as described above. As an image pickup device on which a lateral outline of the tool is projected, a CCD chip or a video camera can be used.

In a further embodiment of the device, the previously described adjusting means are provided. Through it, the tool can be adjusted relative to the tool holder so that over the compensated measured value M _komp the machine tool according to the adjusted set value M is set _to. Preferably, the adjusting means fix the tool in a certain position in the tool holder, and advantageously in the position in which M _comp = M _should apply. This fixation should be maintained at least until there is again a frictional connection between the tool and the tool holder in the course of the production tensioning process. Thus, no adjustment of the tool can result more.

The adjusting means are advantageously formed electromechanically. You can, for example, an electric motor and a transmission with a linearly movable push rod have. For example take the actuating means, the aforementioned setting M _komp = _Msoll before automatically and without operator intervention. Alternatively, an operator can operate the adjustment means such that M _comp = M _{soll is} set. Instead of complex electromechanical actuating means and known adjusting means with fine screws or the like can be provided.

The adjusting means may, for example, from the back of the machine tool through the tool holder to the bottom, so for example to a drill shank of the tool rich. By moving the tool in the tool holder, the length of the entire machine tool can be adjusted.

When thermal shrinkage is used as the manufacturing-tensioning method, a heater is provided for the heating operation of the tool-holder. This may have an induction coil. The heating device is advantageously movably mounted in such a way that it can be moved into the device after the introduction of a machine tool or tool holder. Induction coils for a heating process have the advantage that they work without contact and a heating of the environment is limited.

Typical curves of a dimension function have a relatively steep rise based on the active heating of the tool holder. This is followed by an increasingly flatter further increase up to a maximum value, which mainly results from residual heat effects in the machine tool. This reference curve is thus stored and corresponds to the course of a change in length at precisely defined conditions of the tensioning method, as they can be determined in the reference data.

Reference data are, for example, information about the type of tool holder, such as hollow shaft cone, Morse taper or other Spannkegeltypen or over the material of the tool holder, such as metal or a combination of metal and plastic, the course of the performance of a heater over time or the material Type or dimensions of the tool. As has been described above, these reference data thus form statements about the conditions and sequence of a reference tensioning process with a specific machine tool. These conditions or reference data must conform to the conditions that will later apply to the correct manufacturing fixture procedure of a machine tool. Here, in particular, again on the DE 101 24 275.1 directed.

These and other features are apparent from the claims and from the description and drawings, wherein the individual features each be realized alone or in the form of sub-combinations in one embodiment of the invention and in other fields and advantageous and protectable Representations for which protection is claimed here. The subdivision of the application into sections and subheadings does not limit the general validity of the statements made thereunder.

Brief description of the drawings

Embodiments of the invention are illustrated in the drawings and are explained in more detail below. In the drawings show:

1 a device for producing a machine tool with inserted machine tool,

2 Curves of different dimension functions and

3 a cross section through an embodiment of an insert module according to the invention, with a machine tool in the device 1 can be used.

Detailed description of the embodiments

In 1 is a device 11 for producing a machine tool 21 shown. Here is the machine tool 21 in an insert module 19 used. The insert module 19 again sits in a basic module 17 the device 11 , In this case, in the embodiment shown here, the basic module 17 essentially from a recording. However, it can also be designed as a replaceable part.

While the insert module 19 Outside dimensions, leading to the immutable base module 17 is an inner cone seat on a mounting cone 24 of the machine tool 21 Voted. Thus, differently designed machine tools 21 each with coordinated insert modules 19 in the same basic module 17 be used. It is ensured in each case that a certain point of the machine tool 21 , For example, the circumferential annular shoulder of the tool holder 22 , in a known, possibly always the same, distance to the device 11 or the basic module 17 stands. This is necessary for accurate measurement or adjustment of the machine tool 21 ,

For example, for another form of attachment cone 24 another insert module 19 be formed accordingly.

Furthermore, the device 11 an induction coil 13 on, by means of a holding arm 14 height adjustable, in particular also pivotable, on a bobbin holder 15 is stored. It is also possible to use a circumferentially divided induction coil. The coil turns can contact when assembling the coil parts and result in circumferential coil turns.

As can be seen from the illustration, the induction coil surrounds 13 the food 25 of the tool holder 22 , In a known manner can with the induction coil 13 the food 25 are heated to the consequent expansion process the clamped drill 23 release. After using the machine tool 21 into the device 11 becomes the induction coil 13 from a rest position, which is different from the illustrated work position, over the drill 23 pivoted. Thus, it is located approximately centrally to the dashed Z-axis, which is the longitudinal center axis of the drill 23 equivalent. Subsequently, the induction coil 13 down over the food 25 be guided. An adjustment of the induction coil 13 on the bobbin holder 15 can be done manually or by electric motor.

Furthermore, a measuring device 27 intended. This consists of a symbolically represented image recording device 28 , preferably with a CCD chip. By means of a lighting, not shown, a silhouette of the drill 23 or its tip in the direction of the drawing plane into the image recording device 28 projected. The silhouette is taken from the image capture device 28 evaluated and the position of a specific point, for example, the tip of the drill 23 in the silhouette, relative to a cross 29 detected.

The measuring device 27 is on a second support arm 31 arranged pivotable or height-adjustable. By appropriate sensors, which are readily known to those skilled in the art, each of the exact position of the measuring device 27 relative to the device 11 be determined. This can be determined by the known position of the measuring cross 29 the exact position of, for example, the projection of the shadow crack and thus the tip of the drill 23 be determined yourself. Such a measuring device 27 and the associated measuring method are for example from DE 100 25 007 A1 which is expressly incorporated herein by reference.

Furthermore, the device 11 a controller 34 on, advantageously with one or more microprocessors. The control 34 is on the one hand with both the induction coil 13 as well as with the measuring device 27 connected and can control these and evaluate their signals.

Furthermore, the controller 34 with a data store 35 and a reference data store 36 connected. The separate representation of data storage 35 and reference data store 36 serves for better clarity of the invention. It is quite possible to provide these two data stores in a single data store.

As can be seen, are in the data store 35 Curves or associated functions or values are stored. These essentially correspond to those in 2 shown. These will be discussed in more detail below.

In the reference data store 36 The above-mentioned reference data are stored, which are, above all, parameter specifications for a tensioning method. These are, for example, performance, Operating time and exact position of the induction coil 13 , Type and dimensions of drills 23 , Tool holder 22 and insert module 19 , as well as other parameters.

On a display 38 , which may simultaneously serve as the operating device for the device 11 may be formed by means of a screen 39 for example, a specific measured value of the device 11 , in particular the position of the tip of the drill 23 in the Z-axis direction. In particular, on the display 38 the aforementioned measured values M _comp are displayed. The display is activated 38 about the controller 34 ,

Furthermore, the device 11 actuating means 41 on. These consist of an electric motor 42 and one with the electric motor 42 connected gearbox 43 , From the transmission 43 , which is designed here as a linear gear, goes a push rod 44 up. The push rod can be moved up and down along the Z axis. It reaches through basic module 17 , Insert module 19 as well as tool holder 22 from the bottom to the drill 23 at. Thus, by moving the push rod 44 the drill 23 moved along the Z axis and each held simultaneously in this position. It should be ensured that by the push rod 44 only a movement of the drill 23 takes place along the Z axis. A twisting of the drill 23 should be avoided, for example, by a corresponding compensating bearing in the push rod 44 himself. This compensating bearing ensures that the push rod can only move linearly, but not radially. The balance bearing can also take over the function of converting a rotary motion of an electric motor into a linear movement of the push rod. Similar adjusting means are known in the art from the prior art and need not be explained in detail. According to a further possibility of the invention, instead of the mechanical push rod, a variable liquid or air column can be used. It can be used compressed air or hydraulic oil.

The adjusting means 41 or the electric motor 42 are with the controller 34 connected. This ensures that the controller 34 the electric motor 42 and thus the adjusting means 41 influences or controls.

The following are the curves in 2 explained in more detail. At the same time their occurrence as well as a correction or change of the curves is described.

Is shown in 2 ΔZ, which corresponds to the aforementioned dimension or the measured value M, over time. The units of measure along the ΔZ-axis are mm, which is only to be understood as an example.

There are no schedules along the timeline, the unit of measure can be seconds.

The solid curve _is .DELTA.Z represents the change of the tip of the drill 23 out 1 along the Z-axis during a heating operation of the machine tool 21 for removal and subsequent clamping. As can be seen, the tip of the drill wanders 23 first up, represented by the increase of ΔZ. This effect is up to the fall of the curve especially with an extension of the tool holder 22 or the feed 25 to explain. Because of the induction coil 13 in the feed 25 generated heat only slowly and with delay in the drill 23 wandering itself and changing its length, carries the drill 23 even here hardly any change of ΔZ _is at.

Then follows the steep slope of the curve, an even steeper drop. This is because at that time, due to expansion by heating, the feed 25 the drill 23 releases, so solves the adhesion. Then the drill falls 23 in the feed 25 down, if not straight from the push rod 44 the adjusting agent 41 is supported. It can also happen that when expanding the food 25 the drill 23 with upwards away from the adjusting means and raises until it drops it by widening.

This drop in the curve and thus also the tip of the drill 23 lies in the curve in 2 still above the horizontal axis. It would also be possible for the tip of the drill 23 falls even lower, so ΔZ goes into a negative range. However, this does not change the basic course of the curve.

After the steep fall of the curve _is increasing .DELTA.Z this again, in approximately asymptotically at a slowly decreasing slope. Here it can be said, in essence, that this increase mainly due to a linear expansion of the drill 23 is due. It is possible to switch off the induction coil here again. Finally, the goal is to warm the tool holder 22 namely the release of the drill 23 , reached.

As I said, the solid curve to the right to a kind of saturation. In the further course, which is not shown here and the cooling of drills 23 and tool holders 22 represents the curve falls off again. The final value ΔZ, on which the curve after a long time or complete cooling of the entire machine tool 21 is again lower than the initial value of the curve by the difference of ΔZ in the steep drop at the beginning of the curve. It is thus the difference of ΔZ during the steep fall below the horizontal axis.

From the steep drop of the solid curve runs a dotted curve. This begins at the ascending branch shown in solid lines and then drops off slowly. This dotted curve represents the change in length .DELTA.Z only the tool holder 21 or the top of the feed 25 From this it is clear that, for example, at the time when the solid curve drops sharply due to dropping the drill 23 , the induction coil 13 and thus the heating of the tool holder 22 is switched off. This cools out again and consequently contracts again in its length. The dotted curve is at ΔZ = 0. Finally, the tool holder needs 22 retract to its original length after being expanded due to heating during cooling.

As previously described, a time dependent dimension function of ΔZ is to be generated for a particular machine tool 21 applies, in the disturbing influences such as a dropping of the drill 23 which in an actual manufacturing-tensioning process due to the actuating means 41 do not show up, are off.

For this reason, the branch of the solid curve after the fall is raised by the ΔZ value of the drop, resulting in the dashed curve ΔZ _ref . As can be seen, this is seamlessly on the ascending part of the curve shown _is pulled through to .DELTA.Z. So it needs from the controller 34 only the drop of the actually measured curve of ΔZ _can be determined, in particular with respect to the value of ΔZ. Subsequently, the solid curve .DELTA.Z _{is raised} after dropping by just this value of .DELTA.Z. _One such correct, especially for detecting the drop of the curve from .DELTA.Z and the subsequent displacement of a portion of the curve, are known in the art in general form in the prior art and need not be explained in detail here.

To the dashed curve .DELTA.Z _ref is still to say that they for a long time or after the complete cooling of the machine tool 21 exactly back to ΔZ _ref = 0 runs back. Here, on the one hand, the drop in the curve shown in solid lines has been corrected out, on the other hand, the dashed curve ΔZ _ref corresponds, for example, to a machine tool in which a drill is already at the bottom of the chuck 25 sits down and therefore can not fall down. It will be appreciated that any expansion of the machine tool in the Z direction due to heating after complete cooling must disappear again unless irreversible processes in the material structure of the machine tool have been caused by the heating. However, such processes should be avoided by limiting the heating temperature in any case.

Thus, the curve illustrated by dashed lines .DELTA.Z is _ref, which is represented by solid lines in its initial section, exactly those dimensions function representing the behavior of .DELTA.Z, so the dimension in the longitudinal direction over time.

Furthermore, a dot-dash curve for ΔZ is shown. This is obtained by shifting the dashed curve by a certain absolute value. Such shifting is partially done on certain machine tools where jumps occur either at the beginning or end of a heating process. The dot-dash curve is intended to illustrate that, matched to individual machine tools, a shift of the dashed curve as a whole, and not just in sections, can take place.

A dashed curve .DELTA.Z _ref is, as is clear from the foregoing, obtained by a characterized according to certain reference data heating process of the machine tool used 21 is carried out. The reference data of this heating process or clamping process are in the data memory 36 stored. The derived dimension function or its curve corresponding to the dashed curve from 2 is associated with the assignment to exactly this reference record in the data store 35 stored. This corresponds to the aforementioned "recorden".

As also previously described, dimensional functions or their curves can be correspondingly 2 for exactly one machine tool with a combination of tool holder and tool or of exactly one tool holder and different tools of the same type or exactly one tool and different tool holders of the same type.

Should now, for example, in a particular tool holder 22 a worn drill 23 be replaced by a drill of the same type, so is the machine tool 22 by means of a suitable insert module 19 into the basic module 17 the device 11 used. It will both the induction coil 13 as well as the measuring device 27 in the in 1 shown position brought. About one corresponding command to the controller 34 becomes the induction coil 13 set in motion, warms the food 25 , causing the worn drill 23 is solved and can be removed.

To have now well-defined start conditions, those of the reference dataset and the dimension function for just that combination of toolholders 22 and similar drill 23 can match, the drill 23 to be warmed up according to a first variant. So he has, as in the inclusion of the dimension function also, a certain length extension due to warming.

For heating, the drill can be heated in any way and on the one hand. On the other hand, it can be advantageous in the tool holder 22 used and about to a specific, for the machine tool 21 predetermined nominal dimension Z _{should be} set. To adjust the adjusting means 41 which are used via control buttons 46 and 47 can be controlled.

Now here's the machine tool with the drill set in place 23 to cool again, for example in a separate cooling station. This cooling has the advantage that now the machine tool again in the device 11 can be used and both tool holder and drill 23 have a defined initial temperature and thus defined lengths, as they are based in the reference data set and the corresponding dimension function. Then, as described for the second variant, the actual adjustment process begin.

It would also be possible to record a dimension function for exactly one tool holder and a drill of the same type, respectively 2 in which the cold drill 23 into the already heated and widened food 25 of the tool holder 22 is used. However, since the insertion process is usually done manually and therefore is not known exactly from the timing, resulting in this method again inaccuracies that should actually be avoided.

According to a second variant may be to replace an old and inserting a new drill 23 for a machine tool to be precisely set, begin a heating process according to the parameter specifications from the reference data set. About the measuring device 27 becomes the tip of the drill 23 along the z-axis as Z _is detected, and continuously. The control 34 subtracted from the detected Z _is the value ΔZ _ref corresponding to time, which the controller controls 34 from the corresponding dimension function or curve accordingly 2 extracts. Here, ΔZ _ref corresponds to the aforementioned M _ref .

This ΔZ _ref is thus from the controller 34 of Z _is subtracted, so that Z _comp results. This value Z _comp will appear in the display 38 displayed. So is the operator on the display 38 played a value that actually does not exist. The actual linear expansion Z _{is in} fact just too large by the value ΔZ _ref , depending on the time.

Now either an operator manually sets over the control buttons 46 and 47 , or alternatively the controller 34 automatically, the value Z _comp to a certain nominal dimension Z _{should be} . With an automatic setting, the value Z _soll can be entered into the device. For this purpose and for other functions of setting or operation of the entire device 11 a menu guide can be provided with individual input and display windows.

About the adjusting means 41 or the push rod 44 is for this setting the drill 23 shifted in the Z direction so that its tip is at the desired location, so that Z _comp corresponds to the predetermined Z _soll . This concludes the adjustment process, which can usually take just a few seconds. The adjusting means hold the drill 23 exactly in this position. Now it is waited until the food 25 has contracted by cooling again so far that a sufficient adhesion with the drill 23 is made. Thereafter, the machine tool from the device 11 are removed and completely cooled in a cooling station or the like.

Because of that, how 2 can be taken and explained above, ΔZ _ref for a given combination of tool holder and drill, during the heating process, increases, but for large times or the end of the cooling but back to zero, after cooling, the influence of ΔZ _ref disappeared. The change in length due to the heating, which however prevails during the clamping and unclamping, is taken into account by the inclusion or subtraction in the displayed measured value Z _komp .

The control 34 or a user set by the time-dependent and time each correct compensation of the measured value Z _is Z always _komp a length of the machine tool that is _to located on Z. This length is always exactly the time-dependent ΔZ _ref . It is precisely this ΔZ _ref disappears after cooling of the machine tool again, so that the machine tool per se has the required length Z _soll .

Of course, it will be apparent to those skilled in the art that the device 11 can also be used only for measuring a machine tool or readjusting a machine tool. The above-described recording of the dimension function or curve after 2 can be made at the factory and in the device 11 or in the data memory 35 be stored. Likewise, this can be done individually for a device in an operation itself 11 and existing combinations of tool holders and tools are made.

The in 3 illustrated construction of machine tool 21 with the tool holder 22 represents a variant of a construction according to the invention of an insert module 119 dar. The insert module 119 has a layer structure. It consists on the one hand of an internal use 121 , which basically has its bottom complete with the mounting cone 24 of the tool holder 22 closes. Furthermore, the insert module 119 an outer shell 123 on, in which flush the inner use 121 sitting. The outer shell 123 closes with the basic module 17 ,

The insert module 119 has the illustrated layer structure for improved thermal insulation between tool holder 22 and basic module 17 , This is the inner commitment 121 made of a plastic, the outer shell 123 on the other hand metal. The plastic should meet both high demands on manufacturing precision and dimensional stability, as well as low heat conduction. Due to the thermal insulation properties of the inner shell 121 Plastic is the tool holder 22 better compared to the basic module 17 isolated. The heat can therefore from the tool holder 22 only to a lesser extent into the basic module 17 penetrate and thus distort the measured values.

How out 3 it can be seen, is the inner commitment 121 in the area of the circumferential annular shoulder outside the outer shell 123 overlapping and up to the top of the basic module 17 carried out reaching. This creates a direct or heat-conducting connection between the fastening cone 24 and basic module 17 prevented.

Instead of the two-layer structure according to 3 it is also possible to choose a structure with even more layers. Furthermore, air chambers between metal layers and plastic layers can be provided, which allow an even better insulation effect.

As described, it is possible to have a method and a device 11 for producing a machine tool 21 to accomplish. It is about a measuring device 27 during a reference tensioning process, the change in length ΔZ _{ref of} the tool 23 recorded and stored as a time-dependent dimension function .DELTA.Z. In another clamping process on this machine tool 21 the stored values of the dimension .DELTA.Z function can be used to correct the actually measured, distort by a time-varying heating operation with a corresponding change in length measured values Z _is. Thus, it is possible at any time during a tensioning process or time-independent, a thermal length changes .DELTA.Z _{ref of} the machine tool 21 to take into account and in the length adjustment by means of adjusting means 41 to eliminate.

Claims (7)

Insert module ( 119 ) for attaching a tool holder ( 22 ) of a machine tool ( 21 ) on a basic module provided with a receptacle for the insert module ( 17 ) of an apparatus for producing a machine tool, wherein outer dimensions of the insert module ( 119 ) are adapted to the dimensions of the receptacle for the insert module and wherein the insert module has a cone receptacle for receiving a fastening cone ( 24 ) of the tool holder, characterized in that the insert module ( 119 ) has a thermally insulating structure, which provides thermal insulation between a tool holder inserted into the insert module ( 22 ) and the base module receiving the insert module ( 17 ). Insert module according to claim 1 or 2, wherein an inner area ( 121 ) of the deployment module ( 119 ) made of plastic or ceramic. Insert module according to one of the preceding claims, wherein the insert module ( 119 ) a layer structure of several alternately provided layers ( 121 . 123 ) of metal or thermally insulating material, wherein the thermally insulating material is preferably ceramic or plastic. Insert module according to one of the preceding claims, wherein the cone seat is adapted to a hollow shaft cone or Morse taper. Insert module according to one of the preceding claims, wherein the insert module has an inner insert ( 121 ) and an outer shell ( 123 ), the inner insert has a Konusaufnahme which with a mounting cone ( 24 ) of the tool holder closes and the outer shell ( 123 ) closes with the base module, the outer shell ( 123 ) of a metal and the inner insert ( 121 ) consists of a plastic. Insert module according to claim 5, wherein the inner insert ( 123 ) is designed so that it the outer shell ( 123 ) overlaps at the side facing the tool holder. Insert module according to one of the preceding claims, wherein the insert module has a layer structure with more than two metal layers or plastic layers, wherein air chambers between metal layers and plastic layers are provided.

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