DE102018116242A1 - Grinding wheel device for a grinding device - Google Patents

Abstract

What is described is a grinding wheel device (10) for a grinding device comprising at least one grinding pad (14) and a carrier plate (12) fixedly connected to the grinding pad (14). In this case, the grinding support (14) has at least one connection surface (F _V ) connected to the support plate (12) and forms an abrasive grinding surface (F _S ) opposite the connection surface (F _V ) and facing away from the support plate (12). The carrier plate (12) consisting of a plastic material is produced by means of injection molding and directly and directly connected to the connection surface (F _V ) of the grinding pad (14), wherein the plastic material of the carrier plate (12) by injection directly on the connecting surface (F _V ) Abrasive support (14) is sprayed, in such a way that the carrier plate (12) and the grinding support (14) are materially connected to each other.

Description

Technical area

The invention relates to a grinding wheel device for a grinding device, in particular to a grinding wheel with carrier plate.

State of the art

Grinding wheel devices or grinding tools are well known in the art. For example, in known grinding wheel tools, abrasive bristles can be formed on a substantially plate-shaped plastic base or abrasive filaments can be embedded in a plastic matrix. Such a brush, in which abrasive bristles are formed with abrasive particles on a plastic base, for example, in US 6,179,887 B1 disclosed, wherein the grinding surface is formed in this type of abrasive brushes by the free end-side bristle ends. The DE 196 50 393 A1 again, describes a grinding tool in which a bundle of abrasive monofilaments is attached to a hub and the abrasive monofilaments attached to the hub are embedded in an elastomeric foam. With their tips facing away from the hub, the embedded abrasive monofilaments form an annular or cylindrical abrasive surface.

From the WO 2005/115716 A1 Furthermore, a grinding tool is known, which is produced by means of an injection molding process. For the production of the grinding tool of WO 2005/115716 A1 particles of abrasive granules or abrasive agglomerate are sprinkled into an injection mold and anschießend thermoplastic elastomer material is injected into the injection mold, so that the particles of the abrasive granules are embedded in the thermoplastic elastomer material.

However, the abovementioned grinding tools, in particular for certain purposes or in certain applications, often do not provide the desired grinding performance.

Furthermore, grinding wheel devices, namely grinding wheels with carrier plates, which as a rule consist of a carrier plate or support plate or of a carrier plate with an abrasive grinding wheel or grinding support attached thereto or associated therewith, are known from the state of the art. Such a grinding wheel with carrier plate is for example from the DE 10 2016 102 037 B4 known in which a rigid abrasive pad is applied to a rigid carrier plate made of polyamide or ABS, which consists of fan-shaped arranged grinding blades.

To attach the abrasive pad on the carrier plate, for example, an adhesive that must ensure a permanent connection between the grinding pad and the carrier plate. Such an adhesive therefore has to meet multiple conditions, in particular unrestricted strength even in continuous operation and at high temperatures. Furthermore, the attachment of the abrasive pad by means of the adhesive on the support plate requires sufficient curing, which significantly delays the production.

Despite the known from the prior art solutions, therefore, there is a need for simple and inexpensive to produce, improved grinding wheel devices that are suitable for a variety of applications and have a sufficient grinding performance.

Presentation of the invention

It is therefore an object of the present invention to provide a grinding wheel apparatus which is easy to produce and provides improved grinding performance and which avoids, without restrictions, the disadvantages of the prior art caused by the adhesive. This object is achieved by the device according to independent claim 1. A method for producing a grinding wheel device is further subject matter of claim 15. Further advantageous aspects, details and embodiments of the invention will become apparent from the dependent claims, the description and the drawings.

The present invention provides a grinding wheel apparatus for a sander which has at least one sanding pad and a backing plate rigidly connected to the sanding pad. The grinding pad comprises at least one connecting surface connected to the carrier plate on a first side and, with an opposite second side, forms an abrasive grinding surface opposite the connecting surface and facing away from the carrier plate. The carrier plate made of a plastic material is produced by means of injection molding and directly and directly connected to the connecting surface of the grinding pad, wherein the plastic material of the carrier plate is injection molded directly onto the connecting surface of the grinding pad by injection molding, that the carrier plate and the grinding pad are materially interconnected.

In the present case, a grinding wheel device for a grinding device essentially refers to a grinding wheel with a carrier plate, which in the context of the present invention can be seen as an abrasive article which also serves as a grinding tool or sanding disc or as a supported or supported or supported grinding wheel, and which is designed for a particular rotating surface finishing and for use in a correspondingly rotating driven grinding device or such a working machine, for example a grinding machine, in particular an angle grinder is set up.

In the present case, the carrier plate may also be referred to as a carrier plate and is to be understood essentially as a support body, support plate or support plate. For the purposes of the invention, a grinding pad is understood to be a substantially flat or planar, disc-like element or a flat or flat disc-like structure having a first side or side surface and an opposite second side or side surface. The first side surface forms the connection surface which is directly and directly connected to the carrier plate, and the opposite second side surface forms the outwardly oriented grinding surface defining an underside of the grinding wheel device. The abrasive pad may consist of a single part or of a plurality of composite parts, which together form the flat or flat, disc-like structure. The connection surface and the grinding surface can therefore also be designed, for example, as non-planar surfaces and, for example, have steps or offset edges or projection regions, which can possibly arise if a plurality of parts in a preferably fan-like arrangement to a flat structure are grouped together.

To achieve the above object is provided according to the invention that the existing plastic carrier plate without intervening layer, in particular without intervening adhesive or adhesion promoter by means of an injection molding directly on the abrasive pad, namely, is sprayed onto the bonding surface of the abrasive pad.

This solution has the considerable advantage over the prior art of a simple, rapid production, which essentially requires only one process step, namely the injection molding or molding by injection molding and without the often unpredictable influences of an adhesive, because the plastic material of the support plate directly is sprayed onto the grinding pad. The essentially liquefied, namely plasticized plastic material combines materially with the bonding surface of the grinding pad, resulting in a solid, permanent connection between the two parts after a short curing time of less than one minute, even at high speeds of the grinding wheel device and thus high temperatures extremely is durable.

Due to the instantaneous and direct connection of the grinding pad to the carrier plate according to the invention, the present grinding wheel device particularly advantageously has an improved grinding performance, since it improves the connection of the grinding pad to the carrier plate and is therefore much more stable. This leads to an overall harder grinding wheel device, in particular to a stabilized grinding surface with greater hardness. The grinding wheel device according to the invention can thereby be advantageously operated in rotation in a grinding device while avoiding disturbing vibrations, namely particularly advantageously vibration-free. This has a particularly advantageous effect, since such grinding devices are operated at high speeds, for example in a range of 10,000 to 15,000 revolutions per minute, and the avoidance of vibrations at such high speeds leads to a particularly safe and efficient operation.

In order to additionally improve the stability, in particular the dimensional stability and / or rigidity, of the grinding wheel device, stiffening structures may optionally be provided in the carrier plate, specifically on an upper side of the grinding wheel device, which may, for example, be in the form of annular ribs. Furthermore, alternatively or additionally, structures for improving the elasticity of the grinding wheel device, in particular for improving the elasticity during the application during grinding, may be provided, which may be formed, for example, in the form of annular grooves.

According to a preferred embodiment, the grinding pad of the grinding wheel device may consist of a flat, circular grinding wheel, in particular an emery wheel. The abrasive pad may preferably be formed by a conventional, commercially available grinding wheel, which usually consists of a carrier or carrier material and an abrasive applied thereon, wherein as support basically paper carrier, fabric carrier or Vulkanfiberträger come into question and wherein the abrasive, for example a ceramic grain can be. In this case, the side of the carrier loaded with the abrasive material constitutes the grinding surface and the opposite, unloaded side of the carrier represents the connecting surface. The connecting surface in these embodiments is therefore essentially formed of the material of the carrier of the grinding wheel.

Particularly preferred is the abrasive pad by a fiber disc, in particular a Vulkanfiberscheibe formed, wherein particularly preferably the grinding surface is formed by a scattered ceramic grain abrasive. Such grinding wheels are manufactured and sold, for example, by the company "VSM Vereinigte Schmirgel- und Maschinen-Fabriken AG" and are commercially available under the trade name "VSM CERAMICS Fiberscheiben".

In these particularly preferred embodiments, the carrier material of the vulcanized fiber carrier of the grinding wheel forms the connecting surface of the grinding pad for the direct connection with the plastic material of the carrier plate.

The sanding pad can also be composed of abrasive blades, which are arranged, for example, fan-shaped to the flat structure of the sanding pad. In all cases, the plastic material for the carrier plate in the desired shape can be injected into the mold of the injection molding machine and spray directly and directly on the bonding surface of the grinding pad.

Preferably, the connecting surface and the grinding surface opposite the connecting surface are each formed at least as annular, substantially continuous surfaces. In the present case, this is to be understood in particular as meaning that the two surfaces mentioned form a continuous, closed surface without perforations in at least one annular section. The annular, essentially continuous surface or the annular, continuous surface section preferably occupies more than half, more preferably more than 60%, and especially preferably more than 70% of the total area of the underside of the grinding wheel device. Most preferably, the annular, continuous surface portion on an area ratio of more than 80% or more than 90% of the total area of the underside of the grinding wheel device on. As a result, on the one hand, the connecting surface onto which the plastic material of the carrier plate is sprayed, at least in an annular portion formed as a continuous surface, which ensures a uniform and secure connection between grinding support and carrier plate. On the other hand, the grinding surface is sufficiently large to allow good grinding performance and efficient use.

Particular advantages result from the fact that the grinding surface of the grinding wheel device, namely the grinding surface of the grinding support connected to the carrier plate is cambered. This is to be understood that the grinding surface is not flat or flat in a plane, but has a curvature or curvature. For example, the grinding surface curves in a radial direction, starting from an edge of the grinding wheel device towards the center, for example with a pitch angle in a range of about 3 ° to 10 °, preferably in a range of about 4 ° to 7 ° and more preferably about 5 °.

According to a preferred embodiment of the present invention, slots distributed over the circumference of the carrier plate for the passage of cooling air are incorporated or formed. Such slots are for example from the above aangegebenen DE 10 2016 102 037 B4 known. Especially at high speeds, these slots provide an effective flow of cooling air in the direction of the sanding pad and the machined workpiece, without compromising durability and durability. In continuous operation, temperatures above 100 ° C can be cope with for a long time.

In a further development of the invention, the carrier plate is formed integrally with a hub part, projecting from the radially outward ventilation ribs. Through this, a cooling air flow is additionally generated, which significantly reduces the working temperature.

Particularly preferably, in this case, the hub part has an internal thread Starting to fasten the grinding wheel device on a drive shaft of the grinding device. Also, cooling air passage slots may be incorporated in the hub portion, which in turn support efficient effective cooling.

The carrier plate is preferably made of a thermoplastic material, in particular of a thermoplastic polymer. For example, the carrier plate may consist of a thermoplastic terpolymer, preferably of an acrylonitrile-butadiene-styrene copolymer (ABS). According to an alternative embodiment variant, the carrier plate can consist of a polyamide, preferably of polyamide PA6, in particular of a glass-fiber-reinforced PA6.

Polyamide PA6 is a thermoplastic, semi-crystalline engineering plastic that can be processed as a tough, hard industrial material. The main characteristics are high impact resistance, rigidity and good damping capacity, as well as relatively high dimensional stability. By a possible glass fiber reinforcement, for example, with a glass fiber content of 30%, the plastic is finally firmer and stiffer. By using PA6 or PA6-GF30, the production of the grinding wheel device by means of injection molding can be carried out in an optimized manner, at the same time the stability, strength and hardness of the Grinding wheel device is optimally matched to the technical requirements.

The present invention also includes a method of making a grinding wheel apparatus for a sander by injection molding. In the method, first a grinding pad having a connecting surface and an opposing abrasive grinding surface is provided and introduced into a corresponding molding tool of an injection molding machine such that the connecting surface of the grinding pad points in the direction of a predetermined cavity of the molding tool. Subsequently, a support plate directly connected to the abrasive support is formed by a suitable for the production of the carrier plate plastic material is injected into the closed mold at a predetermined temperature and under pressure, in such a way that the plastic material of the carrier plate directly and directly on the connecting surface of the Abrasive pad sprayed on and thereby the grinding wheel device is generated.

In injection molding, which is one of the primary molding processes, an appropriate material, in particular a plastic material, is liquefied with an injection molding machine, namely plasticized and injected under pressure into a cavity of a corresponding shape, namely into the molding tool or injection molding tool. The cavity thus represents the shaping cavity. In the molding tool, the plastic material passes through cooling or a crosslinking reaction back into the solid state and can be removed as a finished part after opening the mold.

In the method according to the invention, prior to the injection of the plastic material, first the grinding support, for example in the form of a grinding wheel, in particular a Vulkanfiberscheibe, introduced or inserted into the cavity of the mold of the injection molding machine in such a way that the bonding surface of the grinding pad the cavity, namely the cavity or the lumen of the cavity faces, that is, the side of the grinding surface abuts against an inner wall or cavity wall of the mold, whereby the grinding surface is turned in the finished molding of the grinding wheel device to the outside.

When injecting the plastic material into the shaping cavity, which injection takes place, for example, under a pressure in a range of 500 bar to 2000 bar and at a temperature in a range of 200 ° C to 330 ° C, the plastic material is directly and directly on the connection surface the abrasive pad, which is formed for example by the Vulkanfibermaterial the Vulkanfiberträgers the grinding wheel used. It requires no pretreatment of the bonding surface, that is, any type of use of additional binders or adhesives or adhesives, adhesion promoters or the like can be completely avoided.

By curing in the injection molding machine, the plastic material of the carrier plate solidifies and is directly and directly attached to the connecting surface of the grinding pad or attached, in particular materially connected thereto.

Preferably, the carrier plate is integrally formed by injection molding with a hub part. Additively or alternatively, slots distributed through the injection molding over the circumference of the carrier plate for the passage of cooling air can be formed.

Particularly preferably, an internal thread for fastening the grinding wheel device on a drive shaft of the grinding device is formed in the hub part.

Additively or alternatively, the hub part can additionally be molded with corresponding cooling air passage slots.

For example, in the method, a flat circular vulcanized fiber wheel with a scattered ceramic grain abrasive is used as the abrasive pad. At the same time a glass fiber reinforced polyamide PA6 is sprayed as a plastic material for the carrier plate on the grinding pad. The preferred glass fiber reinforced polyamide PA6 has, for example, a glass fiber content of 30%.

list of figures

• 1 eine schematische Draufsicht auf ein erstes Ausführungsbeispiel der Schleifscheibenvorrichtung gemäß der Erfindung;
• 2 einen Schnitt durch die Schleifscheibenvorrichtung der 1;
• 3 eine perspektivische Ansicht der Schleifscheibenvorrichtung der 1;
• 4-6 eine alternative Ausführungsform der Schleifscheibenvorrichtung gemäß der Erfindung, wiederum in Draufsicht, in einer Schnittdarstellung und in einer perspektivischen Ansicht;
• 7-9 eine weitere alternative Ausführungsform der Schleifscheibenvorrichtung gemäß der Erfindung, bei der die Schleifauflage aus Schleiflamellen besteht, wiederum in Draufsicht, in einer Schnittdarstellung und in einer perspektivischen Ansicht;
• 10-12 eine weitere alternative Ausführungsform der Schleifscheibenvorrichtung gemäß der Erfindung, bei der die Schleifauflage aus Schleiflamellen besteht, und zwar in einer unterseitigen Ansicht, in einer Schnittdarstellung und in einer perspektivischen Ansicht von unten;
• 13-15 eine weitere alternative Ausführungsform der Schleifscheibenvorrichtung gemäß der Erfindung, bei der die Schleifauflage aus Schleiflamellen besteht, wiederum in einer unterseitigen Ansicht, in einer Schnittdarstellung und in einer perspektivischen Ansicht von unten;
• 16-18 eine nochmals weitere Ausführungsform der Schleifscheibenvorrichtung gemäß der Erfindung, wiederum in Draufsicht, in einer Schnittdarstellung und in einer perspektivischen Ansicht und
• 19-21 eine nochmals weitere Ausführungsform der Schleifscheibenvorrichtung gemäß der Erfindung, wiederum in Draufsicht, in einer Schnittdarstellung und in einer perspektivischen Ansicht.

The invention will be explained in more detail with reference to embodiments in conjunction with the drawings. Show it

• 1 a schematic plan view of a first embodiment of the grinding wheel device according to the invention;
• 2 a section through the grinding wheel device of 1 ;
• 3 a perspective view of the grinding wheel device of 1 ;
• 4-6 an alternative embodiment of the grinding wheel device according to the invention, again in plan view, in a sectional view and in a perspective view;
• 7-9 a further alternative embodiment of the grinding wheel device according to the Invention, in which the grinding pad consists of grinding blades, again in plan view, in a sectional view and in a perspective view;
• 10-12 a further alternative embodiment of the grinding wheel device according to the invention, wherein the grinding pad consists of grinding blades, in a bottom view, in a sectional view and in a perspective view from below;
• 13-15 a further alternative embodiment of the grinding wheel device according to the invention, in which the grinding pad consists of grinding blades, again in a bottom view, in a sectional view and in a perspective view from below;
• 16-18 a still further embodiment of the grinding wheel device according to the invention, again in plan view, in a sectional view and in a perspective view and
• 19-21 a still further embodiment of the grinding wheel device according to the invention, again in plan view, in a sectional view and in a perspective view.

Ways to carry out the invention

All the embodiments described below is common that the grinding wheel device 10 according to the invention, a substantially circular carrier plate 12 Includes, with an abrasive sanding pad 14 stocked, such that the sanding pad 14 and the carrier plate 12 are directly and directly interconnected without intermediate layer. The side of the grinding wheel device 10 on which the abrasive sanding pad 14 is arranged, provides a bottom U the grinding wheel device 10 which is one through the carrier plate 12 defined top O opposite.

The carrier plate 12 is made by injection molding and is to form the grinding wheel device according to the invention 10 directly on the sanding pad 14 sprayed and thus directly to the grinding pad 14 formed. The carrier plate 12 is made of plastic, such as ABS, since this material is food safe, has sufficient elasticity, and has a long life. For the carrier plate 12 Other sprayable plastics can also be used. Particularly preferred is the carrier plate 12 of a polyamide, in particular of polyamide PA6, very particularly preferably of glass-fiber-reinforced polyamide with, for example, 30% glass fiber content, such as PA6-GF30.

In injection molding, which is one of the original molding processes, the plastic for the carrier plate is made with an injection molding machine 12 , For example, ABS or PA6 plasticized and injected into a shaping cavity, namely the cavity of the mold under pressure. The plastic material goes through cooling back into the solid state. For producing the grinding wheel device according to the invention 10 Before the injection of the plastic material, the abrasive pad first 14 inserted into the cavity of the mold such that the one grinding surface F _S forming side of the grinding pad 14 abuts against an inner wall of the cavity and thus a connecting surface F _V the grinding pad 14 facing the cavity. The subsequent injection of the plastic material into the shaping cavity, takes place under a pressure in a range of 500 bar to 2000 bar and at a temperature in a range of 200 ° C to 330 ° C. As a result, the plastic material directly and directly on the connection surface F _V the grinding pad 14 sprayed. By curing in the injection molding machine, the plastic material of the carrier plate solidifies 12 and is directly and immediately at the interface V _F the grinding pad 14 connected or materially connected to this.

In the embodiment of 1 to 3 there is one connection surface F _V and a grinding surface F _S having sanding pad 14 from a flat, circular emery disk 16 , with the carrier plate 12 without intermediate adhesive directly and directly by injection molding on the interface F _V the grinding pad 14 or emery wheel 16 is sprayed on. This is done by injection molding in a suitable injection molding machine as described above.

The sanding pad 14 is first introduced or inserted into the cavity of the mold, in such a way that the connecting surface F _V the grinding pad 14 facing the cavity, that is the grinding surface F _S is facing an inner wall or cavity wall of the mold and lies in particular on this. Thereafter, the plasticized plastic material of the carrier plate 12 injected under pressure and at elevated temperature into the cavity. After a short curing time of less than a minute, the plastic of the carrier plate is 12 hard and with the emery wheel 16 or the grinding pad 14 Permanently firmly connected.

In the embodiment of 1 to 3 is at the top O the grinding wheel device 10 integral with the carrier plate 12 a hub part 18 formed, from the radially outward ventilation ribs 20 protrude. These provide the in the Operation generated speeds for a sufficient flow of cooling air over the surface of the carrier plate 12 ,

As the 2 and 3 show, has the hub part 18 an internal thread 22 on, which is also molded during injection molding, so that the carrier plate 12 on a drive shaft of a grinder, in particular a grinding machine, such as an angle grinder, can be attached.

The essentially annular sanding pad 14 , which in the area of the hub part 18 comprises a central aperture, has an annular, continuous connection surface F _V and an annular, continuous grinding surface F _S on, wherein the annular surfaces over more than 90% of the total area of the bottom U the grinding wheel device 10 extend.

For further, improved cooling are in the carrier plate 12 of the example shown on the outer circumference and on the top O distributed slots 24 incorporated or molded, for the passage of cooling air against both the connecting surface F _V the grinding pad 14 , which can also be seen as an inner surface, as well as provide against the machined workpiece. The cooling air slots 24 are according to the out DE 10 2016 102 037 B4 known doctrine and will not be explained again here.

The 4 to 6 show a variant of the embodiment of 1 to 3 in which the carrier plate 12 also immediately and without glue on the sanding pad 14 is sprayed on. Deviating from the example of 1 to 3 Here is the middle hub part 18 cupped flat and has no ventilation ribs. In this embodiment of the 4 to 6 is the central opening of the sanding pad 14 in the area of the hub part 18 larger than in the example of 1 to 3 such that the area fraction of the annular continuous connecting surface F _V and grinding surface F _S on the total area of the bottom U the grinding wheel device 10 is lower than in the example of 1 to 3 ,

In the alternative, also preferred variant of 7 to 9 there is the sanding pad 14 made of fan-shaped grinding lamellae 26 on which the plastic of the carrier plate 12 also sprayed without intermediate adhesive. The fan-shaped grinding lamellae 26 again form a flat sanding pad 14 with connection surface F _V and grinding surface F _S which also in this embodiment, due to the overlaps of the fan-shaped arranged grinding blades 26 are formed as respective annular, continuous surfaces.

In the embodiment of the 10 to 12 has the hub part 18 similar to the embodiment of the 4 to 6 no ventilation ribs. Also missing in this embodiment, the louvers on the outer circumference of the carrier plate 12 ,

The 13 to 15 show a modified embodiment with a similar as in the example of 4 to 6 trained carrier plate 12 Here, as in the example of 10 to 12 the sanding pad 14 made of fan-shaped grinding lamellae 26 exists on which the carrier plate 12 is sprayed on immediately.

Finally, the show 16 to 18 an embodiment with a carrier plate 12 , the outer circumference cooling air slots 24 for the passage of cooling air and in which also the flat, about bowl-shaped hub 18 in addition to the ventilation ribs 20 Cooling air passage slots 28 for the passage of cooling air. The sanding pad 14 consists here of fan-shaped arranged grinding lamellae 26 ,

In the 19 to 21 is an embodiment of the grinding wheel device 10 shown in which the sanding pad 14 through a grinding wheel or emery wheel 16 is formed. The grinding wheel is a Vulkanfiberscheibe, in which the grinding surface F _S is formed by a scattered ceramic grain abrasive.

In the grinding wheel device 10 of the example of 19 to 21 is the hub part 18 with ventilation ribs 20 as well as with internal thread 22 educated. In the carrier plate 12 However, no cooling air slots are provided.

For added stability, rigidity and flexural strength are at the top O the grinding wheel device 10 on the carrier plate 12 Formed stiffening structures, in the illustrated example in the form of an annular rib 30 , Furthermore, an annular groove 32 provided, which serves to improve the elasticity during grinding.

LIST OF REFERENCE NUMBERS

10

Grinding wheel device

12

carrier plate

14

sanding support

16

Grinding wheel or emery wheel

18

hub part

20

Ventialtionsrippe

22

inner thread

24

Cooling air slots

26

grinding blades

28

Cooling air passage slots

30

annular rib

32

ring groove

F _S

grinding surface

F _V

interface

O

top

U

bottom

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• US 6179887 B1 [0002]
• DE 19650393 A1 [0002]
• WO 2005/115716 A1 [0003]
• DE 102016102037 B4 [0005, 0022, 0045]

Claims (18)

Grinding wheel device (10) for a grinding device comprising at least one grinding pad (14) and a carrier plate (12) fixedly connected to the grinding pad (14), the grinding pad (14) having at least one connecting surface (F _V ) connected to the carrier plate (12) and one of the connecting surface (F _V ) opposite and the carrier plate (12) facing away from, abrasive grinding surface (F _S ), wherein the plastic material consisting of a carrier plate (12) produced by injection molding and directly and directly with the connecting surface (F _V ) Abrasive support (14) is connected, wherein the plastic material of the carrier plate (12) by injection directly on the connecting surface (F _V ) of the abrasive pad (14) is injected, in such a way that the carrier plate (12) and the abrasive pad (14) material fit connected to each other. Grinding wheel device (10) according to Claim 1 , characterized in that the grinding pad (14) consists of a flat, circular grinding wheel, in particular emery wheel (16). Grinding wheel device (10) according to Claim 1 or 2 , characterized in that the abrasive pad (14) is formed by a fiber disc, in particular a Vulkanfiberscheibe. Grinding wheel device (10) according to Claim 1 , characterized in that the abrasive pad (14) is composed of abrasive blades (26). Grinding wheel device (10) according to any one of the preceding claims, characterized in that the connecting surface (F _V ) and the abutment surface (F _V ) opposite grinding surface (F _S ) are each formed as a substantially continuous, annular surfaces. Grinding wheel device (10) according to one of the preceding claims, characterized in that the grinding surface (F _S ) is formed by a ceramic grain abrasive scattered on a carrier material. Grinding wheel device (10) according to one of the preceding claims, characterized in that the grinding surface (F _S ) of the backing plate (14) connected to the carrier plate (12) is cambered. Grinding wheel device (10) according to any one of the preceding claims, characterized in that in the carrier plate (12) distributed over its circumference cooling air slots (24) are incorporated for the passage of cooling air. Grinding wheel device (10) according to any one of the preceding claims, characterized in that the carrier plate (12) is formed integrally with a hub part (18), projecting from the hub part (18) radially outwardly ventilation ribs (20). Grinding wheel device (10) according to Claim 9 , characterized in that the hub part (18) has an internal thread (22) for fastening the grinding wheel device (10) on a drive shaft of the grinding device. Grinding wheel device (10) according to Claim 9 or 10 , characterized in that in the hub part (18) cooling air passage slots (28) are incorporated. Grinding wheel device (10) according to one of the preceding claims, characterized in that the carrier plate (12) is made of a thermoplastic plastic, in particular of a thermoplastic polymer. Grinding wheel device (10) according to Claim 12 , characterized in that the carrier plate (12) consists of a thermoplastic terpolymer, preferably of an acrylonitrile-butadiene-styrene copolymer (ABS). Grinding wheel device (10) according to Claim 12 , characterized in that the carrier plate (12) consists of a polyamide PA6, in particular of a glass fiber reinforced polyamide PA6. Method for producing a grinding wheel device (10) for a grinding device by means of injection molding, in which first a grinding pad (14) with a connecting surface (F _V ) and an opposing abrasive grinding surface (F _S ) is provided and introduced into a corresponding molding tool of an injection molding machine, in that the joining surface (F _V ) of the grinding pad (14) points in the direction of a predetermined cavity of the molding tool, wherein subsequently a carrier plate (12) connected to the grinding pad (14) is formed by applying a temperature at a predetermined temperature and pressure Producing the carrier plate (12) suitable plastic material is injected into the closed mold, in such a way that the plastic material of the carrier plate (12) directly and directly on the connecting surface (F _V ) of the abrasive pad (14) sprayed and thereby the grinding wheel device (10) we produce d. Method according to Claim 15 , characterized in that the carrier plate (12) is formed integrally with a hub part (18) and / or in that slots (24) distributed over the circumference of the carrier plate (12) are formed for the passage of cooling air. Method according to Claim 16 characterized in that in the hub part (18) an internal thread (22) for mounting the grinding wheel device (10) is formed on a drive shaft of the sander and / or that the hub part (18) is formed with corresponding cooling air passage slots (28). Method according to one of Claims 15 to 17 , characterized in that a flat, circular Vulkanfiberscheibe with a scattered ceramic grain abrasive as a grinding pad (14) is used and that a glass fiber reinforced polyamide PA6 as a plastic material for the carrier plate (12) is sprayed onto the grinding pad (14).

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