EP3616841A2 - Endless abrasive belt for a grinding machine - Google Patents

Abstract

The invention relates to an endless grinding belt (8) for a grinding machine, which comprises: a flexible carrier structure, an active layer on the top of the carrier structure with a binder and abrasive grains accommodated in the binder. In order to enable reliable detection, it is provided that a transponder device (9) is attached to an underside of the carrier structure and / or the endless sanding belt (8) and has a fastening area (26) and a flag (28), the fastening area (26) is glued to the underside with an adhesive layer , the flag (28) is held by the fastening area (26) and protrudes in a lateral direction from the endless grinding belt (8), and in the flag (28) a transponder (21) with a transponder chip (22) and one Antenna (23) is arranged.

Description

The invention relates to an endless grinding belt for a grinding machine and a corresponding grinding machine with the endless grinding belt.

Endless sanding belts are used to machine metallic workpieces, in particular with high contact forces, and are generally clamped between a grinding roller and a tensioning roller of a grinding machine. The workpieces can be transported past the sanding roller by means of a transport direction and processed with the sanding belt, in that the sanding roller presses the active side of the endless sanding belt against the workpiece in a defined manner and a desired sanding result is achieved through the defined belt speed and pressing force of the sanding belt. The endless sanding belts are exposed to high forces and deformations; thus they are guided over the rollers, in some cases also additionally slidingly over a grinding shoe or other pressing device, whereby they are exposed to tensile stress on the one hand and to the pressing force against the workpiece on the other hand.

Here, the endless sanding belt can form a certain slip on the back (passive side) with respect to the rollers; When using a sanding shoe, sliding friction accordingly occurs on its surface, so that not only the active side of the sanding belt with abrasive grains held in a binder, but also the high deformations and forces as well as the back formed by the carrier structure, for example a fabric mechanical wear.

For the coordination of industrial production, transponders are increasingly being installed not only on workpieces, but also on the processing means, for example also on abrasives. The DE 10 2016 211 937 A1 describes a hand-held machine tool designed as an angle grinder, which receives a grinding wheel as an insert tool. A code is attached to the grinding wheel, which can be designed in particular as an RFID code, the machine tool having an identification unit for identifying the code.

However, it turns out that the attachment of such a transponder to an endless sanding belt is not without problems. Due to the considerable mechanical loads and deformations, RFID structures are generally quickly destroyed. The considerable slip on the back of the sanding belt also leads to mechanical wear, which can damage an RFID transponder accordingly.

The DE 10 2016 214 568 A1 describes a processing device in which a determined pressure force is transmitted to a control device by means of wireless data transmission, in particular RFID technology.

The DE 10 2014 104 310 U1 describes a wide belt sander with an abrasive belt, the tensioning roller of its position being adjustable by means of an actuator in such a way that the abrasive belt assumes a predetermined position on the sanding roller. An oscillating signal is entered via a control in order to change the position of the endless sanding belt in the transverse direction.

The WO 1998/026453 A1 describes a chip module and a method for its production, in which a contact metallization is sunk and a coil can additionally be provided to form a transponder.

The DE 10 2014 224 570 A1 describes a protective device for a machine tool, which can be designed as an RFID communication device. Here, a sensor unit is provided, which is a parameter such. B. can detect and detect the temperature of a workpiece surface.

The invention has for its object to provide an endless sanding belt for a machine tool and such a machine tool that enable safe operation and safe detection of the endless sanding belt.

This object is achieved by an endless grinding belt according to claim 1. The sub-claims describe preferred further developments. In addition, a grinding machine with the endless grinding belt is provided.

A transponder device with a wireless transponder is thus provided on the endless grinding belt. The transponder device protrudes laterally from the grinding belt so that the transponder lies outside the grinding belt; thus the transponder is not pressed on or between the support structure and the roller, particularly when the grinding belt is tensioned on the rollers.

Here, the transponder device can in particular have a fastening area and a flag. B. is attached to the back of the sanding belt and carries the flag that protrudes laterally beyond the sanding belt and receives the transponder.

Thus, the grinding belt with its active layer is pressed against the workpiece in the grinding operation or during workpiece processing in the usual way and guided along the workpiece by the grinding roller. The forces and deformations that occur in this way, however, do not at least not directly load the transponder that protrudes laterally into the flag.

The transponder can in particular be an RFID transponder and have an RFID chip with an antenna or antenna structure. The transponder can thus be read wirelessly by a detector of the machine tool, with RFID technology in particular also permitting larger reading distances, so that, for. B. a single detector is sufficient and possibly establishes data communication with the transponder after a short transport of the grinding belt and can read out the data stored in the transponder.

Data relevant to the machining processes can advantageously be stored in the transponder, in particular one or more of the following data: data about the series of the sanding belt, the grit, a delivery date, and machining data such as the contact pressure or contact pressure, transport speed, maximum operating times or processing times , as well as an individual identification number.

This enables the endless sanding belt to be clearly identified subsequently. If thus the grinding belt due to abrasion on its back no longer allows visual identification, and because z. B. the active layer in modern compact grains can no longer be clearly identified even by a person skilled in the art on the grain, the transponder nevertheless subsequently enables clear identification without being subjected to the direct stress during processing.

According to a further development, the transponder, in particular its transponder chip, can also be written, in particular with wear-dependent data, preferably with a runtime and / or running distance and / or a wear-dependent evaluation number, which e.g. is formed depending on the previous term and the contact pressure during this term. If the endless belt is later used again in this or another corresponding machine tool, then this data can be read out again.

This enables an improved utilization of the permissible wear-dependent parameters. An exchange of an endless belt, e.g. also an interruption of a current processing, e.g. after another band has been used in the meantime, resuming processing with the first band no longer leads to a loss in grinding capacity, and errors or uncertainties in handling can also be avoided in particular.

According to a further embodiment, as an alternative or in addition to storing the wear-dependent data in the transponder, current storage in the machine tool, in particular a writable memory of the machine tool, can also take place, with here e.g. Data records with individual identification numbers of the endless sanding belts can be created. This means that various endless belts, even for short processing times, can be used and appropriately reused later in order to make optimum use of the endless belts.

According to a preferred embodiment, the transponder device is formed with a plastic strip which has an adhesive layer; thus in particular a strip of adhesive film can be provided here. The adhesive film can directly form the fastening area on the back of the sanding belt or the back of the support structure of the sanding belt is stuck on. The adhesive strip or the adhesive film is preferably folded over or folded in at its projecting end in which the transponder is attached, as a result of which the stiffness of the flag formed in this way is increased and the adhesive layer is covered in the projecting end. Thus, the fastening area with the adjoining, somewhat stiffer and no longer adhesive flag can be formed in a surprisingly simple manner from an adhesive film or an adhesive strip.

The transponder device can in particular be accommodated on a roll as a pull-off strip. The user thus pulls off a peel-off strip, folds the front end with the transponder, for which purpose a predetermined kink or fold line is advantageously formed, so that the user can fold the end in a defined manner and thereby form the stiffened, no longer adhesive flag. Subsequently, the user can thus glue the transponder device with the fastening area, which also has the adhesive layer, to the back of the endless sanding belt or its carrier structure, which already ensures secure fastening.

The transponder device is advantageously designed as an elongated strip, for example with a rectangular shape. Here, the fastening area is advantageously applied at an oblique attachment angle to the endless sanding belt, ie it does not extend in particular from the edge perpendicular to the center of the endless sanding belt, but at an oblique angle of z. B. 10 to 80 °. It is recognized here that the adhesive film of the fastening area can also represent a certain mechanical resistance of the sanding belt guided over the rollers, and thus the oblique attachment of the front and rear edges of the fastening area does not lead to excessive jerking, but rather successively on the rollers and if necessary, get a sanding shoe.

If the fastening area is shorter, the mounting angle is no longer so relevant, so that the grinding process is not affected to a relevant extent; thus a non-oblique attachment can be made.

Fig. 1

eine Schleifmaschine mit einem Endlos-Schleifband gemäß einer Ausführungsform der Erfindung bei der Bearbeitung eines Werkstücks;

Fig. 2

eine Aufsicht auf das Endlos-Schleifband im Bereich des Transponders, mit Detailvergrößerung;

Fig. 3

einen Schnitt durch das Endlos-Schleifband gemäß einer Ausführungsform;

Fig. 4

die Schritte a), b) der Ausbildung der Transpondereinrichtung bei Einsatz einer Klebefolie.

The invention is explained in more detail below with reference to the accompanying drawings in some embodiments. Show it:

Fig. 1

a grinding machine with an endless grinding belt according to an embodiment of the invention when machining a workpiece;

Fig. 2

a view of the endless sanding belt in the area of the transponder, with an enlarged detail;

Fig. 3

a section through the endless grinding belt according to an embodiment;

Fig. 4

the steps a), b) the formation of the transponder device when using an adhesive film.

Figure 1 shows a grinding machine 1 when machining a workpiece 2, the z. B. can be a metallic tube or metallic profile and is conveyed in the transport direction t. The grinding machine 1 has a grinding roller 3, a tensioning roller 4, a drive (motor) 5 for driving the grinding roller 3 at a belt speed v, furthermore a control device 6 and an input and output unit 7, e.g. B. with monitor and keyboard. Furthermore, an endless sanding belt 8 is stretched between the tensioning roller 4 and the sanding roller 3, to which a transponder device 9 is attached, which is connected by a detector connected to the control device 6 10 is detected. For this purpose, the detector 10 sends out RFID query signals R1, which the transponder device 9 receives, and forms and outputs RFID response signals R2 therefrom.

The grinding roller 3 is pressed with a contact force F or a contact pressure onto the surface 2a of the workpiece 2, so that the endless grinding belt 8 processes the upper side 2a of the workpiece 2 accordingly. The grinding machine 1 can in particular have further details, for. B. an oscillation adjustment of the endless grinding belt 8 in the transverse direction by a corresponding actuating device, and an edge detection or edge control, as is not shown here. Also, e.g. the endless sanding belt 8 is slidably guided over a shoe or other pressing device.

How from Fig. 3 it can be seen that the endless grinding belt 8 has a carrier structure 12 which, for. B. can be formed as a fabric, fleece or paper material. The active layer 14 is formed on the carrier structure 12 and can in particular have abrasive grains 15 in a synthetic resin 16. In addition, an adhesion promoting layer, not shown here, can be provided between the carrier structure 12 and the active layer 14. The abrasive grains 15 can e.g. B. fully ceramic based on alumina, or also based on zirconium corundum. In a manner not shown here, the endless grinding belt 8 - as usual as such - by z. B. formed a joint of the ends of an abrasive belt or with an overlap to the endless abrasive belt 8.

The transponder device 9 is fastened on a rear side 12a of the carrier structure 12, ie thus the rear side of the endless grinding belt 8. The transponder device 9 has an adhesive strip 18 which is designed as a plastic film or plastic strip 19 with an adhesive layer 20 on its underside 19a and a non-adhesive upper side 19b. On A transponder 21 as an RFID sticker with an RFID chip 22 and antenna 23 is preferably glued to the non-adhesive upper side 19b.

For the manufacture of the transponder device 9 according to Figure 4 the plastic strip 19 with its adhesive layer 20 formed on the underside 19a reversibly on a base, for. B. a carrier for adhesive tape, glued and the transponder 21 stuck as an RFID sticker on the top 19b. Thus, e.g. B. provided on a roll a variety of such transponder devices 9. For attachment to the endless sanding belt 8, a transponder device 9 is pulled off the base and in accordance with Figure 4a folded along a fold line (predetermined crease line) 25 in such a way that an upper part of the plastic strip 19 is folded over with the RFID sticker 21, the adhesive layer 20 coming into contact with itself. Thus, according to Fig. 4b subsequently the transponder device 9 is formed with a remaining fastening area 26, on the underside of which the adhesive layer 20 is also formed, and a flag 28 formed by folding over the upper area, in which the transponder 21 with the RFID chip 22 and the antenna 23 is received, the flag 28 is non-adhesive and is somewhat stiffer by folding.

The transponder device 9 designed in this way is then attached to the fastening area 26 in such a way on the underside 12a of the support structure 12, i.e. H. the underside of the endless grinding belt 8, glued so that it is advantageously attached non-vertically or at an attachment angle α to the edge line, where α ≠ 90 °, z. B. α = 10 ° to 80 °. The fastening region 26 thus runs obliquely with respect to the running direction or transport direction t of the endless grinding belt 8. The flag 28 is positioned outside the endless grinding belt 8, i.e. the flag 28 protrudes laterally.

When the grinding machine 1 is in operation, the endless grinding belt 8 is thus pressed against the upper side 2a by the tensioning roller 4 and the grinding roller 3 of the workpiece 2 to be machined, the rear side 12a of the carrier structure 12 correspondingly coming into contact with the rollers 3, 4. The fastening region 26 thus also comes to the rollers 3, 4, and due to its oblique attachment to the rollers it forms a relatively low resistance and in particular no jerk when grinding. The flag 28 with the transponder 21, ie the RFID chip 22 and the antenna 23, projects laterally and is therefore not braced. In particular, the transponder 21 is not mechanically loaded between the grinding roller 3 and the workpiece 2.

The detector 10 can next to the endless grinding belt 8, i. H. one of the runs. However, since the RFID technology also permits larger detection distances here, the detector 10 can also be positioned at a greater distance from the endless grinding belt 8. The detector 10 reads the RFID transponder 21 accordingly without contact by outputting the RFID query signals R1 and recording the RFID response signals R2, the RFID transponder 21 correspondingly functioning as a passive transponder. The detector 10 then outputs a detection signal S1 to the control device 6, which in turn controls the drive 5 for the grinding roller 3 accordingly. The user can check the data stored on the RFID chip 22 at any time via the input and output device 7. Furthermore, the control device 6 can also issue warning signals S2 to the input and output device 7 if the settings which are stored on the RFID chip 22 do not match the working parameters set via the control device 6, such as contact pressure F, belt speed v etc. match, or if necessary, a non-matching endless grinding belt 8 is used.

In a further development, the RFID chip 22 can also be described via the detector 10, if a corresponding RFID chip 22 and an actively writing detector 10 are used wear-dependent data, for example the running time and / or running distance are stored, and / or an evaluation number which is formed, for example, from the running time and a contact pressure and evaluates the previous wear.

Furthermore, the storage of wear-dependent data, e.g. Runtime and / or running distance, also possible together with an identification number of the endless grinding belt 8 in the machine tool 1, e.g. a memory 6a, which is provided internally or externally to the control device 6, wherein the memory 6a can also be combined with the input and output device 7.

Reference list

1

Grinding machine

2

workpiece

3

Grinding roller

4

Tension roller

5

drive

6

Control device

6a

Memory, in particular writable and readable

7

Input and output device

8th

Endless sanding belt

9

Transponder device

10

detector

12th

Support structure, e.g. B. tissue

12a

Underside of the support structure 12

12b

Top side of the support structure 12

14

active layer of the endless sanding belt 8

15

Abrasive grains

16

Binder, synthetic resin

18th

Adhesive strips

19

Plastic strips

19a

bottom

19b

Top, non-adhesive

20th

Adhesive layer

21

RFID sticker

22

RFID chip

23

antenna

25

Nominal bending line

26

Fastening area

28

banner

t

Direction of transport

F

Contact pressure

v

Belt speed

R1

RFID interrogation signals

R2

RFID response signals

S1

Detection signal

S2

Warning signal

α

Mounting angle

Claims (15)

Endless sanding belt (8) for a grinding machine (1), the endless sanding belt (8) having: a flexible support structure (12), on an upper side (12b) of the carrier structure (12) an active layer (14) with a binder (16) and abrasive grains (15) accommodated in the binder (16), characterized in that a transponder device (9) is attached to an underside (12a) of the carrier structure (12) and / or the endless grinding belt (8), the transponder device (9) having a fastening area (26) and a flag (28), the fastening area (26) is glued to the underside (12a) with an adhesive layer (20), the flag (28) is held by the fastening area (26) and protrudes in a lateral direction from the endless grinding belt (8), and A transponder (21) with a transponder chip (22) and an antenna (23) for a wireless data connection to the grinding machine (1) is arranged in the flag (28). Endless sanding belt (8) according to claim 1, characterized in that the flag (28) is held directly by the fastening area (26). Endless sanding belt (8) according to one of the preceding claims, characterized in that the fastening area (26) has an elongated extension, preferably with a rectangular shape, the fastening area (26) opposite a side edge (8c) of the endless sanding belt (8 ) has an attachment angle (a) of not equal to 90 °, for example 10 ° to 80 °, to form an oblique Course of the fastening area (26) on the underside opposite a transport direction (t). Endless sanding belt (8) according to one of the preceding claims, characterized in that the transponder chip (22) is designed as an RFID chip (22) to which the antenna (23) connects as a flat structure. Endless sanding belt (8) according to one of the preceding claims, characterized in that the transponder device (9) has a plastic strip (19) with an adhesive layer (20) formed on its underside (19a),
wherein the plastic strip (19) is glued to the endless sanding belt (8) in such a way that it forms the fastening area (26) on the endless sanding belt (8) and
the flag (28) is formed by a protruding area of the plastic strip (19). Endless sanding belt (8) according to claim 5, characterized in that the plastic strip (19) is folded or folded to form the flag (28) in such a way that the adhesive layer (20) comes into contact with itself. Endless sanding belt (8) according to claim 6, characterized in that the plastic strip (19) is folded over in the area of a predetermined folding line (25), for example with a perforation or weakening. Endless sanding belt (8) according to one of claims 5 to 7, characterized in that the transponder (21) is stuck on the plastic strip (19) as a transponder sticker (21), preferably on a non-adhesive top side (19b ) of the plastic strip (19). Endless sanding belt (8) according to one of the preceding claims, characterized in that one or more of the following data are stored on the transponder chip (22) and can be read out by the detector (10):
Grain of the endless sanding belt (8), delivery date, series, contact pressure, contact pressure (F), running time, running distance, running speed of the endless sanding belt (8). Endless sanding belt (8) according to claim 9, characterized in that the transponder chip (22) can also be written by the detector (10), in particular with wear-dependent data, preferably with a running time and / or running distance and / or a wear-dependent evaluation number , for example depending on the running time and the contact pressure during the running time. Endless sanding belt (8) according to one of the preceding claims, characterized in that the carrier structure (12) is formed from textile material, for example woven or non-woven, or paper material. Endless sanding belt (8) according to one of the preceding claims, characterized in that the transponder (21) lies completely to the side outside of the carrier structure (12) and the active layer (14), preferably in a parallel orientation to the carrier structure (12). Grinding machine (1) which has: a grinding roller (3), a tension roller (4), a control device (6), an input and output unit (7), an endless grinding belt (8) according to one of the preceding claims, which is stretched between the tensioning roller (4) and the grinding roller (3), a drive (5) for driving the grinding roller (3) and / or the endless grinding belt (8), and a detector (10) which transmits wireless query signals, in particular RFID query signals (R1) to the transponder device (9) of the endless grinding belt (8) and receives wireless response signals (R2) output by the transponder device (9) and as a function thereof the response signals (R2) outputs detection signals (S1) to the control device (6). Grinding machine (1) according to claim 13, characterized in that the control device extracts stored process parameters from the transponder device (9) from the detection signals (S1) and with the process parameters the drive (5), in particular a contact pressure (F) and / or belt speed (v ) checked, and depending on the check outputs a notification signal or error signal (S2) to the input and output device (7), for information to the user. Grinding machine (1) according to claim 13 or 14, characterized in that it has a writable and readable memory (6a) for storing wear-dependent data of one or more endless grinding belts (8), in particular with data records which have a unique identification number of the endless grinding belt (8) included.

Images