WO2018145698A1

WO2018145698A1 - Tool assembly having sensor, and machine tool having the tool assembly

Info

Publication number: WO2018145698A1
Application number: PCT/DE2018/100100
Authority: WO
Inventors: Martin Buschka; Matthias Weiss
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2017-02-09
Filing date: 2018-02-07
Publication date: 2018-08-16
Also published as: DE102017102578A1; CN212683336U

Abstract

In machine tools for separating production methods, blade parts are used which are effective in machining and which have a blade edge. The blade parts are moved relative to the tool. The blade parts are selected according to the machining task and can differ from one another in view of different parameters or construction methods. In addition, blade parts form a wear part in the machine tool, wherein these have a limited service life and must be changed. In many applications, the production process is monitored with sensors in order to gather process data. The sensors are thereby arranged as close as possible to the blade part in order to be able to receive the process data in an uncompromised manner and as precisely as possible. According to the invention, a tool assembly (2) is provided for a machine tool (1) for machining a workpiece, comprising a tool holder (9) and a tool (8), wherein the tool (8) has a blade carrier (9) and a blade body (10), wherein the tool holder has a receiver (7) for the tool (8), and comprising at least one sensor (11) for receiving a machining measurement variable, wherein the sensor (11) is arranged on the tool holder.

Description

Tool arrangement with sensor and machine tool with the

tooling

The invention relates to a tool arrangement for a machine tool for machining a workpiece with a tool holder and with a tool, wherein the tool comprises a cutter carrier and a cutter body, wherein the tool holder has a receptacle for the tool. The invention further relates to a machine tool with the tool arrangement.

In machine tools for separating manufacturing processes cutting parts are used, which are effective in the processing and on which the cutting wedges are located. The cutting parts are moved relative to the tool. The cutting parts are selected with regard to the machining task and may differ with respect to the various parameters or designs. In addition, cutting parts form a wear part in the machine tool, which have a limited life and must be changed.

The manufacturing process is monitored by sensors in some applications to capture process data. The sensors are arranged as close as possible to the cutting part in order to record the process data genuine and as accurate as possible.

From DE 196 32 148 A1 discloses a machine tool for metal cutting machining with a continuously operating system for tool monitoring is known in which the process variables are metrologically detected, evaluated and implemented for immediate process control. In this case, an arrangement of a combined, or a plurality of individual force, temperature and acceleration sensors at a sensitive point and directly in the region of the support surface of the tool holder for the cutting body for simultaneous Acquisition of the measurement data, wherein the signal evaluation unit for processing the signal data is arranged in the tool holder.

DE 10 2007 005 221 A1 describes the use of piezoceramic converters for regulating a machining workpiece machining. The transducers are disposed at at least one location on the cutting tool, comprising a carrier and a cutting element, or in contact with the carrier in the region of the bearing of the cutting tool.

It is an object of the present invention to provide a tool assembly for a machine tool, which can be used very flexible. This object is achieved by a tool assembly having the features of claim 1 and claim 8. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the accompanying drawings.

The tool arrangement according to the invention for a machine tool for machining a workpiece has a tool holder and a tool, wherein the tool has a cutter carrier and a cutter body. The tool holder has a receptacle for the tool. Furthermore, at least one sensor for receiving a Bearbeitungsmessgröße available, wherein the at least one sensor is arranged without a contact with the tool on the tool holder.

It has been found that an arrangement of a sensor in the region of the tool or adjacent to the blade carrier leads to considerable measurement inaccuracies. For example, in the case of an arrangement of a sensor in the region of an interface between tool holder and cutter carrier, in which a measured value detection takes place between two vibrating components, relative movements can occur between them which impair the measurement result. A reliable and reliable evaluation can be reproducible only if the at least one sensor on the tool holder, spaced from the interface to the blade carrier and thus without contact to this, is arranged. The mechanical load is reduced in an arrangement of the at least one sensor in the region of the tool holder, since damage by chips and the like is less likely than in an arrangement on the tool itself. Thus, the useful life of the tool assembly and in particular the at least one sensor is increased ,

The invention relates to a tool assembly which is suitable and / or designed for a machine tool. The machine tool may be, for example, a lathe or a milling machine. The tool arrangement is used for machining a workpiece. Preferably, the workpiece is formed as a metallic workpiece. The processing is in particular a separating treatment, in particular a machining.

The tool assembly has a tool holder and a tool. The tool includes a cutter carrier and a cutter body. The cutting body has in particular a cutting part. It can be provided that the cutting body forms a geometrically indeterminate cutting edge. However, it is preferred that the cutting body has a geometrically determined cutting edge. The blade body is detachably and / or interchangeably arranged in the blade carrier.

The tool holder has a receptacle for the tool, in particular for the blade carrier. In the recording of the blade carrier is detachably and / or interchangeably arranged.

Particularly preferably, the tool arrangement, in particular the tool holder and / or the tool is arranged stationary in the machine tool. In the context of the invention it is proposed that the tool arrangement has at least or exactly one sensor for receiving a Bearbeitungsmessgröße, wherein the sensor is arranged on the tool holder, without contact with the tool. The sensor can be arranged on an outer surface or in the interior of the tool holder. In the Bearbeitungsmessgröße is in particular a process measurement in the machining of the workpiece.

It is an advantage of the invention that the tool holder is an assembly of components which, in contrast to the tool, are not subject to wear. Arranged on these components, in particular integrated and / or mounted sensors thus need not be changed when replacing the tool. The sensor or the sensors can thus be upgraded once to the tool assembly and continuously provide process data as Bearbeitungsmessgrößen. In particular, the at least one sensor does not have to be changed when the tool is changed or when the machine tool is converted. As a result, the at least one sensor is not a wearing part. The tool arrangement can thereby be used much more flexibly, since retrofitting despite the sensor can be carried out in a simple manner.

It is preferred that the sensor be secured so that it is protected from wear and conditions at the direct processing site such as those caused by coolant or chips. It is e.g. preferred that the cable of the at least one sensor is guided protected against chips and coolant in or on the tool holder. Another advantage is that in the tool holder different tools with different tool geometries can be used. In a multi-bladed tool thus multiple cutting can be monitored with only one sensor, which is arranged in the tool holder. Thus, the sensorization of each individual tool can be dispensed with.

In a preferred embodiment of the invention, the sensor as a temperature sensor for monitoring a temperature, as a force sensor for Monitoring a force, as an acceleration sensor for monitoring an acceleration, as a vibration sensor for monitoring vibrations, in particular structure-borne noise, or as a multi-criteria sensor, wherein the multi-criteria sensor may include any selection of the aforementioned sensors or other sensors. Thus, the sensor can be adapted to the desired Bearbeitungsmessgröße.

In possible structural embodiments of the invention, the receptacle in the tool holder can be designed as a rectangular receptacle for receiving a cutter carrier with a rectangular cross-section, or as an omnidirectional receptacle for receiving a cutter carrier with a round cross-section.

In a development of the invention, the tool holder has a tool base holder and a tool change holder. The receptacle for the tool is arranged in the tool change holder, the tool base holder is preferably stationary, in particular insoluble, connected to the machine tool. In this embodiment, the tool change holder can be replaced depending on the tool.

It can be provided that the at least one sensor is arranged on the tool change holder. This has the advantage that the at least one sensor is positioned close to the process, but also has the disadvantage that when changing the tool change holder, the at least one sensor has to be changed. Accordingly, it is particularly preferred that the at least one sensor is arranged on the tool base holder and thus does not have to be changed.

In an exemplary embodiment, the at least one sensor is arranged on an outer surface, in particular side surface of the tool base holder. On the side surface, the sensor is particularly well protected because of contamination due to gravity on the side surface and thus the sensor can not or only poorly adhere.

In a further development or alternative of the invention, the at least one sensor is arranged on an outer surface, in particular on a side surface, on a cover surface and / or on a bottom surface of the tool change holder.

In exemplary embodiments, the cutting body is formed as an insert, in particular as an indexable insert.

Another object of the invention is formed by the machine tool with the tool assembly, as described above.

Further features, advantages and effects of the invention will become apparent from the following description of a preferred embodiment of the invention and the accompanying figures. These show:

Figure 1 is a schematic block diagram of a tool assembly as an embodiment of the invention;

2, 3 show two exemplary embodiments of a tool change holder for the tool arrangement in FIG. 1.

1 shows a schematic block diagram of a machine tool 1 with a tool arrangement 2. The machine tool 1 shows a stationary section 3 on which a tool base holder 4 is arranged. The tool base holder 4 is thus formed as a stationary portion of the machine tool 1. On the tool base holder 4, a tool change holder 5 can be arranged detachably. The tool base holder 4 and the tool change holder 5 together form a tool holder 13. The tool change holder 5 has, for example, an angle 6 as an interface for detachable coupling with the tool base holder 4. Furthermore, the tool change holder 5 has a receptacle 7, in which a tool 8 is arranged. The tool 8 is detachably arranged in the receptacle 7 and / or in the tool change holder 5. The tool 8 has a blade carrier 9 and a blade body 10. The cutting body 10 has an example geometrically determined cutting edge. However, this can also carry several such cutting. The blade carrier 9 is formed as an intermediate element between the blade body 10 and the tool change holder 5.

In the embodiment shown in FIG. 1, the blade carrier 9 has a rectangular cross-section. As is apparent in particular from Figure 2, which also shows a tool change holder 5 for receiving the cutter support 9 with a rectangular cross-section, the receptacle 7 also has a rectangular receiving cross section. Alternatively, the blade carrier 9 can also take a round cross-section, this can then be recorded in a tool change holder 5, as shown in Figure 3, with a receptacle 7 with a round receiving cross-section.

The blade body 10 may be formed, for example, as a cutting tool, in particular as a separator exchange plate.

During the conversion of the machine tool 1, on the one hand, the blade body 10 must be changed for example because of wear. With a corresponding change, the blade carrier 9 is usually removed from the tool change holder 5. In other words, the tool 8 is removed. In a larger conversion of the machine tool 1 of the tool change holder 5 is exchanged, for example, to accommodate tools 8 with different cross-sections, as shown in Figures 2 and 3. The tool arrangement 2 has at least one sensor 1 1 for receiving processing measured quantities. The sensor 1 1 may be arranged on the tool base holder 4 in a first alternative embodiment. It is possible that this - as shown - is arranged on a side surface, since this is aligned vertically and run off impurities due to gravity from the sensor 1 1. Der Sensor 1 1 wird von der Sensor 1 1 umlaufend. It may also be that the sensor 1 1 is arranged such that it is integrated in the tool base holder 4. Alternatively or additionally, it is possible that the sensor 1 1 is arranged on a side surface on a top surface on a lower surface or on a front side of the tool change holder 5.

In the arrangement of the sensor 1 1 on the tool base holder 4 there is the advantage that the sensor 1 1 always remains stationary, regardless of the manner in which the machine tool 1 and / or the tool assembly 2 is retrofitted. In the arrangement of the sensor 1 1 to the tool change holder 5, there is the advantage that the sensor 1 1 is closer to the actual machining process, and only then must be dismantled together with the tool change holder 5, when the tool change holder 5 is exchanged. Thus, it does not have to be disassembled when only the cutter body 10 is changed.

The sensor 1 1 thus forms a stationary device when it is arranged on the tool base holder 4, or a quasi-stationary device when it is arranged on the tool change holder 5. In both cases, it is possible to lay any cables for power supply and / or signal routing in the tool assembly 2 protected.

Optionally, in addition, it is possible for the signals from the sensor or the sensors 11 to be combined in an evaluation device 12 in order to evaluate the processing measured variables and in this way to implement process monitoring of the production process. The sensor 1 1 may be formed as a temperature sensor, force sensor, acceleration sensor, vibration sensor or as a multi-criteria sensor. The machining can be a milling, turning, machining etc. 2 shows a schematic three-dimensional representation of the tool change holder 5, wherein possible positions of the sensor 1 1 are again shown with circles. Shown are sensors 1 1 at the top, the bottom and on the front side of the tool change holder 5. In the same way are shown in Figure 3 different positions of the sensor 1 1 on the tool change holder 5.

LIST OF REFERENCE NUMBERS

machine tool

tooling

stationary section

Basic toolholder

Tool change holder

angle

admission

Tool

cutting carrier

cutting body

sensor

evaluation

tool holder

Claims

claims

1 . Tool arrangement (2) for a machine tool (1) for machining a workpiece

with a tool holder (9)

and with a tool (8), the tool (8) having a blade carrier (9) and a blade body (10),

wherein the tool holder (9) has a receptacle (7) for the tool (8), and with at least one sensor (1 1) for receiving a Bearbeitungsmessgröße, characterized in that

the at least one sensor (1 1) without a contact to the tool (8) on the tool holder (9) is arranged.

2. Tool arrangement (2) according to claim 1, characterized in that the sensor (1 1) is designed as a temperature sensor, force sensor, acceleration sensor, vibration sensor or as a multi-criteria sensor.

3. tool assembly (2) according to claim 1 or 2, characterized in that the receptacle (7) is designed as a rectangular receptacle or as a round recording.

4. Tool arrangement (2) according to one of the preceding claims, characterized in that the tool holder (9) comprises a tool base holder (4) and a tool change holder (5).

5. tool assembly (2) according to claim 4, characterized in that the at least one sensor (1 1) on an outer surface of the tool base holder (4) is arranged.

6. Tool arrangement (2) according to one of the preceding claims, characterized in that the at least one sensor (1 1) is arranged on an outer surface of the tool change holder (5).

7. Tool arrangement (2) according to one of the preceding claims, that the cutting body (10) is designed as a cutting plate and / or indexable insert.

8. Machine tool (1), characterized by a tool arrangement (2) according to one of the preceding claims.