WO2014127390A1

WO2014127390A1 - Device and method for machining

Info

Publication number: WO2014127390A1
Application number: PCT/AT2013/000200
Authority: WO
Inventors: Peter Schelling
Original assignee: Amann Girrbach Ag
Priority date: 2013-02-19
Filing date: 2013-12-13
Publication date: 2014-08-28
Also published as: DE102013002815A1

Abstract

The invention relates to a device (1) for machining at least one, in particular dental, workpiece (2) by means of at least one machining tool (4) arranged on at least one tool carrier head (3) of the device (1), wherein the device (1) comprises at least one fastening apparatus (5), to which a retaining apparatus (6) for accommodating the workpiece (2) to be machined can detachably fastened, wherein the device (1) comprises a control apparatus (7), which controls the tool carrier head (3) having the machining tool (4) and/or the fastening apparatus (5) at least to complete at least one accommodating hole (8) for the workpiece (2) to be machined in the retaining apparatus (6) and stores the position, preferably together with the shape, of the completed accommodating hole (8) in the retaining apparatus (6) in a coordinate system (9) of the device (1).

Description

Apparatus and process for machining

The present invention relates to a device for machining

Machining of at least one, in particular dental, workpiece by means of at least one, on at least one tool carrier head of the device arranged cutting tool, the device comprises at least one fastening device to which a holding device for receiving the workpiece to be machined is releasably fastened.

Moreover, the invention also relates to a method for operating a

Device for machining at least one, in particular dental, workpiece.

Generic devices as well as methods are known in the prior art. By way of example, reference may be made to the prior art to DE 10 201 1 109 939 A1. These days, these are often so-called CNC milling machines. In particular, dental workpieces such as e.g. artificial teeth, inlays, bridges and the like made from blanks. These blanks may be made of plastic, ceramic or metal or metal alloys or have such materials. The workpieces to be machined are held in the holding device during machining. The holding device is detachably fastened to a fastening device of the device. As a result, the holding device is exchangeable. It can therefore with the same device sequentially and / or simultaneously different

Workpieces which are held in different holding devices are processed. In the prior art, at the beginning of the machining of the workpieces is a blank, which usually has no relevant shape for the final product to be produced. This makes it possible, with the machining somewhere in the blank or not yet machined Work piece to work out the final product from the blank so practically from the solid. The exact position is, as long as sufficient material is available, usually not so important. The situation is different, if as workpieces not blanks but

Semi-finished products are to be machined in order to post-process them or to give them their final shape. In these cases, it is very important that the cutting tool exactly the areas or points are met, where the Nach- or

Finishing to be performed.

Now it is so that in the manufacture of the holding devices, which are releasably attachable to the fastening device, usually tolerances occur, so that each holding device has an individual shape to a certain extent. However, since very high accuracies, usually in the sub-millimeter range, are required in the finishing or finishing of semi-finished products, it is difficult in the prior art to exactly match the point or area in the semi-finished product to be further processed, which is held in the respective holding device to meet, which is to be further processed by cutting.

The task is therefore to propose an improvement that can solve this problem.

This object is achieved by a device according to claim 1.

Furthermore, an inventive method according to claim 5 is provided for solving the problem.

A device according to the invention is thus characterized in that the device has a control device, which the tool carrier head with the cutting tool and / or the fastening device at least for completing at least one receiving recess for the machined Workpiece in the holding device controls and the position, preferably together with the shape of the finished receiving recess in the

Holding device stores in a coordinate system of the device. In the method according to the invention it is provided that at least one

Receiving recess for the workpiece to be machined in the holding device of the device itself is at least completed and the position,

preferably together with the mold, the finished receiving recess in the holding device in a coordinate system of the device is stored by the control device.

In the method, it is again particularly favorable when the tool carrier head with the cutting tool and / or the fastening device is actuated by the control device at least for the completion of the receiving recess for the workpiece to be machined in the holding device or

become.

In other words, it is a basic idea of the invention that the device, which then later machined the workpieces, at least one receiving recess, in which the workpiece can then be arranged, ausformt in the holding device itself or milled into this. The device can then make the itself in the individual holding device

Recording recesses or their position and possibly also form in a device own coordinate system. This has the consequence that the device for each individually used holding device, the position or position and possibly also the shape of the corresponding

Receive receiving recess or receiving recesses for the workpiece to be machined. As a result, there is no longer any problem to exactly approach a position on the workpiece within the receiving recess with the tool. Manufacturing tolerances in the manufacture of the holding device and thus slight differences in shape between the individual holding devices thus no longer constitute a problem. The invention is particularly preferably used when it is provided that at least one already preformed semi-finished product of the device for post-processing, preferably as a workpiece arranged in the holding device

Finishing, further machined. In this case, it is particularly important to specify the areas and points to be worked on

Approach the semi-finished product exactly and continue to machine it.

Nevertheless, devices and methods according to the invention can also be used to machine workpieces in the form of blanks into which the entire outer contour of the end product to be created still has to be incorporated. The blanks may be e.g. around blocks from the

act appropriate material. In the case of semi-finished products in the dental sector, exemplary prefabricated artificial teeth, inlays, bridges and the like are to be mentioned, which at least in some areas still have to be brought into their final form. The term of the workpiece thus includes both the not yet processed blank and the semi-finished product. As finished end products are e.g. ready to call custom or retouched artificial teeth, inlays, bridges and the like. In a receiving recess, individual, but also several such

Workpieces be arranged in the holding device. It can be provided that the individual workpiece directly in the receiving recess of

Holding device is attached. As an alternative, it is also possible that one or more workpieces are fastened with the interposition of at least one holding frame in the receiving recess. For this it is of course important that the workpieces are fixed in a precisely predetermined position in the holding frame. This attachment may e.g. by wax, glue, by others

Potting materials or the like done. In general, the receiving recess is a recess in the holding device, in which at least one workpiece can be arranged directly or even with the interposition of said holding frame or with the interposition of a potting compound or the like. It is favorable when the finished Receiving recess is at least partially performed as a complete breakthrough in the holding device. This has the advantage that in the

Receiving recess held workpiece at least two

opposite sides can be edited out if it is in the

Holding device or the receiving recess is arranged. Of the

For the sake of completeness, it is pointed out that the

Receiving recess does not necessarily have to be designed as a complete breakthrough. To simplify the exact positioning of the workpiece or said holding frame in the holding device or its receiving recess, preferred variants of the invention provide that on or in the holding device in the region of the finished receiving recess at least one stop for unique positioning of the workpiece or one, the workpiece

receiving holding frame is carried out in the holding device.

For the purposes of the invention it can be provided that the receiving recess of the device or the tool carrier head with the tool is completely executed in the holding device. In order to limit the duration of the machining process, which is necessary for the complete copy of the receiving recess in the holding device, but can also be provided that in the

Holding device in advance already at least one basic form of a

Receiving recess is present, which then of the device itself according to the invention by corresponding cutting. Machining is brought into its final position and shape of the finished receiving recess. In this sense, it is also to be understood if in the claims 1 and 5 of at least for the completion of at least one receiving recess is mentioned. The receiving recess can thus be either completely manufactured in the holding device or only completed. In both cases, the device itself produces the final position and shape of the receiving recess in the

Holding device, so that at least the position in the coordinate system of

Device can be stored. Particularly preferably, the Machining for training or completion of the receiving recess in the holding device in a known zero position of the holding device relative to the fastening device. This is particularly favorable when the holding device moves in or by means of the fastening device, in particular can be rotated or pivoted. In which

Coordinate system of the device is an on-machine coordinate system, based on which the device works in the machining. Such machine-own coordinate systems of

Device are known per se in the prior art.

For devices according to the invention, e.g. to CNC mills or other machining facilities that have already included the corresponding control device. However, it can just as well be provided that a device according to the invention consists of an arrangement of at least one CNC milling device or other cutting device and at least one external control device. In the external

Control means may be e.g. to an external personal computer, laptop or the like, which is wirelessly or wired to the CNC milling device to control these. In such arrangements, the coordinate system of the device is then the machine's own

Coordinate system of the CNC milling device or other cutting device.

As cutting tools are all known in the prior art such tools in question, these are primarily drills, cutters and

Grinding tools. The tools are usually interchangeable on

Tool carrier head of the device fastened and usually just as interchangeable as the releasably fastened to the fastening device

Holding devices for receiving the workpiece to be machined. In order to be able to make or finish the receiving recess in the holding device, but also to be able to subsequently process the workpiece held in the receiving recess, see preferred Devices according to the invention that the tool by means of the tool carrier head and / or the holding device by means of

Fastening device in response to the coordinate system and is controlled by the control device is movable or are. Depending on the

Coordinate system means that every movement of the

Tool carrier head and / or the holding device or fastening device of the machine are finally known as coordinates, so that the

Control device can control the said moving parts accordingly and their current position knows each. Furthermore, it is also advantageous if the holding device in a unique connection position on the

Fastening device can be fastened, the holding device is thus not fastened in any desired connection positions or positions on the fastening device. Further features and details of preferred embodiments of the

Invention will be explained below with reference to an embodiment. Show it:

Fig. 1 and 2, a device according to the invention in the form of an arrangement of a CNC milling device and a separate control device to the

control;

Fig. 3 is a holding device in which there is no receiving recess; 4 to 6 different holding devices, in which the

Receiving recesses are already completed;

Fig. 7 is a partially sectioned view of a holding device, in which a plurality of workpieces with the interposition of a holding frame in a

Receiving recess are used;

Fig. 8 is a view from direction A of FIG. 7 and

Fig. 9 by way of example a setting aid with which the workpieces or semi-finished products can be arranged in exact positioning in the holding frame. 1 and 2, an inventive device 1 is shown, which is realized from an arrangement of the CNC dental milling device 27 and the executed here as a separate control computer control device 7. The illustrated CNC dental milling device is known in its basic structure, for example from DE 10 201 1 109 939 A1. With regard to the general structure of this CNC dental milling device 27, reference is made to the said published patent application. The example of a CNC dental milling device 27 shown here is suitable both for dry and for wet machining of particular dental workpieces. So that dust and moisture can not escape into the environment, the CNC dental milling 27 has a housing 12 which encloses a processing cavity 15 together with the closure flap 13, so that when the closure flap 13 is closed neither dust nor moisture from the

Processing cavity 15, in which the machining takes place, can escape into the environment. 1 and 2, the closure flap 13 is shown in the open position, in which the processing cavity 15 is accessible from the outside. In Fig. 1, a holding device 6 is shown, as it is attached to the fastening device 5. In the holding device 6 according to FIG. 1, the receiving recesses 8 are already formed, as described in detail e.g. in Figs. 4 to 8 is shown. The fastening device 5, at which the

Holding device 6 can be fastened in a unique connection position is in the illustrated embodiment part of a pivot arm 17 which is pivotable about the second axis 26. By means of the fastening device 5 is the

Holding device 6 additionally rotatable about the first axis 25 in the illustrated embodiment. On the tool carrier head 3, the tool 4, preferably

replaceable, fastened during the machining process. As a rule, the tool carrier head 3 also drives the tool 4. In addition, in the exemplary embodiment shown, it can be moved in all three spatial directions together with the tool 4 in the processing cavity 15. All movements of the tool carrier head 3, the pivot arm 17 and thus also the

Fastening device 5 and the holding device 6 are carried out in dependence of the machine's own coordinate system 9 and are controlled accordingly by the control device 7. The tool carrier head 3 with the thereto attached tool 4 can be clearly seen in Fig. 2, since in Fig. 2, the Haiteeinrichtung 6 is removed from the fastening device 5.

By means of the recognition device 24, the position of the tool 4 together with the tool carrier head 3 can be calibrated or checked.

Often two different cutting tools 4 are required for an exact and / or complete machining of a workpiece. These differ, e.g. Due to their size and thus fineness of processing, their suitability to process certain materials, etc. In order to enable a rapid tool change depending on the respective workpiece 2 to be machined, in the embodiment shown here, the holding devices 6 each tool holder 14. These in turn have several tool holders 16, in each of which a tool 4, when it is not needed for processing, can be stored. As a result, the correct tools 4 can already be stored in the processing cavity 15 during tool change, so that the paths to be covered and thus the time required for a tool change are very low.

The attachment of the respective holding device 6 to the fastening device 5 is effected by means of the respective coupling piece 18. These coupling pieces 18 suitably comprise e.g. by their shape or corresponding grooves or noses predetermined indexing, which ensures that the holding device 6 in a unique connection position on the fastening device. 5

are fastened.

According to the invention, it is now provided that the receiving recess 8 or the receiving recesses 8 for the workpiece or workpieces 2 to be machined in the holding device 6 are at least completed by the device 1 itself and that the respective position and preferably also the respective shape of the finished receiving recess or receiving recesses 8 is stored in the individual holding device 6 in the coordinate system of the device 1 by the control device 7 or be. The Receiving recess 8 can only be completed. This means that already prefabricated recordings are present in the holding device 6, which are then brought in accordance with the invention by the device 1 itself in the final form and position. It may as well be one of them

Example, in Fig. 3 illustrated holding device 6 are assumed, in which there is no recording. In this case, the

Receiving recess 8 and the receiving recesses 8 are completely milled from the device 1 itself by means of the tool 4 in the holding device 6. By storing the position and possibly also the shape of the thus produced by the device or the CNC dental milling device 27 itself or at least completed receiving recess 8 im

In-machine coordinate system 9 problems with manufacturing tolerances in the holding device 6 are turned off. The stored position of

Receiving recess 8 in an individual holding device 6, when used, can be read out again at any time and used for an exact control of the process of machining the workpiece 2. The control device 7 controls the process of training or completion of the receiving recess 8 in the holding device 6 as well as the later

Processing of or in the respective receiving recess 8 of the respective holding device 6 fixed workpieces. 2

4 to 6 show three individual holding devices 6, in each of which four receiving recesses 8 have been introduced in the manner according to the invention. Since the position of the respective receiving recesses 8 for each

Holding device 6 individually as a function of the coordinate system. 9

is stored, it does not interfere with a subsequent very precise machining of the workpieces 2 when the receiving recess 8 in the various holding devices 6 have different positions. As already explained, it is advantageous if in the or

Receiving recesses 8 stops 10 are provided which are helpful in an exact positioning of the workpieces 2 in the holding device 6. In the exemplary embodiment shown, the workpieces 2, which are here designed as prefabricated artificial teeth, ie as semi-finished products, are not positioned directly but with the interposition of a holding frame 11 in the receiving recess 8. In the exemplary embodiment shown, the contour of the receiving recesses 8 milled into the holding device 6 corresponds exactly to this

Circumference geometry of the holding frame 11 together. This makes it possible for the exact positioning of the holding frame 11 together with the workpieces 2 only so far into the receiving recess 8 of the respective holding device 6 must be inserted until the holding frame 1 1 is applied to the stops 10 of the individual receiving recess 8. This is in the partially cut

Representations according to FIGS. 7 and 8 to see well. It can also be clearly seen in FIG. 8 that the receiving recesses 8 are formed at least in regions as a complete opening in the holding device 6. This makes it possible to work the workpieces 2 from two opposite sides.

In the illustrated embodiment, the holding frame 1 1 on the stopper 10th

positively and otherwise held in the receiving recess 8 frictionally. Of course, other forms of friction, form, or even

cohesive attachment of the holding frame 1 1 or the workpieces 2 in the receiving recess 8 can be realized. It may be screw, snap, bayonet or other closures. Even a pure gluing is possible, as well as an additional form-fitting or a pure frictional connection. In the case of the exemplary embodiment of the interposition of a holding frame 1 1 between the workpiece 2 and the receiving recess 8, it is of course important that the workpieces 2 to be processed, here in the form of prefabricated artificial teeth, ie semi-finished products, are fastened exactly in predetermined positions in the holding frame 11 , In the illustrated embodiment, the attachment of the workpieces 2 takes place in the holding frame 1 1 by means of a suitable wax 19th Fig. 9 shows an example of a setting aid, with which it can be ensured that the workpieces 2 are fixed in the exact predetermined position in the holding frame 1 1. In this procedure, as exemplified in FIG. 9, a two-part mold is used. The base support 20 has Justieraufnahmen 21, in which the individual workpieces 2, so here the prefabricated artificial teeth are inserted in a unique position. Subsequently, the holding frame 1 1 is placed on the base support 20 in the predetermined position. Then, the second mold half 22 is also placed on the base support 20, whereby the mold is closed. Through the filling slots 23, the wax 19 can now be introduced, so that after curing of the wax 19, the workpieces 2 are fixed in their predetermined position in the holding frame 1 1. This is of course only one example, as for an exact positioning of the workpieces 2 in one

Holding frame 1 1 can be taken care of.

L e g e to the reference numbers:

1 device

2 workpiece

3 tool carrier head

4 tool

5 fastening device

6 holding device

7 control device

8 receiving recess

9 coordination system

10 stop

1 1 retaining frame

12 housing

1 3 flap

14 tool holder

15 processing cavity

16 tool holder

17 swivel arm

18 coupling piece

19 wax

20 base carriers

21 adjustment shots

22 mold half

23 filling slots

24 detection device

25 first axis

26 second axis

27 CNC dental milling equipment

Claims

claims

1 . Device (1) for machining at least one, in particular dental, workpiece (2) by means of at least one, arranged on at least one tool carrier head (3) of the device (1)

the device (1) has at least one fastening device (5) on which a holding device (6) for receiving the workpiece to be machined (2) is releasably fastened, characterized in that the device (1) a Control device (7), which the tool carrier head (3) with the cutting tool (4) and / or the fastening device (5) at least for completing at least one receiving recess (8) for the workpiece to be machined (2) in the holding device (6) controls and the position, preferably together with the shape, the finished

Receiving recess (8) in the holding device (6) in one

Coordinate system (9) of the device (1) stores.

2. Device (1) according to claim 1, characterized in that the

Tool (4) by means of the tool carrier head (3) and / or the

Holding device (6) by means of the fastening device (5) in dependence of the coordinate system (9) and by the control device (7) is driven in a controlled manner or are.

3. Device (1) according to claim 1 or 2, characterized in that the holding device (6) in a unique connection position on the fastening device (5) can be fastened.

4. Device (1) according to one of claims 1 to 3, characterized in that the finished receiving recess (8) at least partially a complete breakthrough in the holding device (6) and / or the holding device (6) in the region of the finished receiving recess (8) at least one stop (10) for unique positioning of the workpiece (2) or a, the workpiece (2) receiving the holding frame (1 1) in the holding device (6).

5. A method for operating a device (1), in particular according to one of claims 1 to 4, for the machining of at least one, in particular dental, workpiece (2) by means of at least one, at least one tool carrier head (3) of the device (1). disposed

The device (1) has at least one fastening device (5) on which a holding device (6) for receiving the workpiece (2) to be machined is detachably fastened, characterized in that at least one receiving recess (8) for the workpiece to be machined (2) in the holding device (6) of the

Device (1) itself is at least completed and the position, preferably together with the shape of the finished

Receiving recess (8) in the holding device (6) in one

Coordinate system of the device (1) by the control device (7) is stored.

6. The method according to claim 5, characterized in that the

Tool carrier head (3) with the cutting tool (4) and / or the fastening device (5) of the control device (7) at least for completion of the receiving recess (8) for the machined

Workpiece (2) in the holding device (6) is driven or be.

7. The method according to claim 5 or 6, characterized in that as in the holding device (6) arranged workpiece (2) at least one already preformed semi-finished product from the device (1) for finishing, preferably finishing, further machined.

8. The method according to any one of claims 5 to 7, characterized in that the at least one workpiece (2) directly or with the interposition of at least one holding frame (1 1) in the receiving recess (8) is attached.

9. The method according to any one of claims 5 to 8, characterized in that the finished receiving recess (8) is at least partially performed as a complete breakthrough in the holding device (6).

10. The method according to any one of claims 5 to 9, characterized in that on or in the holding device (6) in the region of the finished

Receiving recess (8) at least one stop (10) for unambiguous

^' Positioning of the workpiece (2) or one, the workpiece (2)

receiving holding frame (1 1) in the holding device (6) is executed.