CA3017577C - Grinding disc device for a grinding apparatus - Google Patents
Grinding disc device for a grinding apparatus Download PDFInfo
- Publication number
- CA3017577C CA3017577C CA3017577A CA3017577A CA3017577C CA 3017577 C CA3017577 C CA 3017577C CA 3017577 A CA3017577 A CA 3017577A CA 3017577 A CA3017577 A CA 3017577A CA 3017577 C CA3017577 C CA 3017577C
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- Prior art keywords
- grinding
- disc
- carrier
- disc device
- carrier disc
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
- B24D9/08—Circular back-plates for carrying flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/18—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor with cooling provisions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/20—Mountings for the wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/16—Bushings; Mountings
Abstract
A grinding disc device for a grinding apparatus is described, comprising at least one grinding layer and a carrier disc fixedly connected to the grinding layer. The grinding layer has at least one connection surface connected to the carrier disc and forms an abrasive grinding surface lying opposite the connection surface and facing away from the carrier disc. The carrier disc made of a plastic material is produced by means of injection moulding and is connected immediately and directly to the connection surface of the grinding layer, wherein the plastic material of the carrier disc is sprayed by means of injection moulding immediately and directly onto the connection surface of the grinding layer, and more precisely such that the carrier disc and the grinding layer are connected to one another in a material-locking manner.
Description
Grinding Disc Device for a Grinding Apparatus Field The invention relates to a grinding disc device for a grinding apparatus, in particular to a grinding disc with a carrier disc.
Background Grinding disc devices or grinding tools are sufficiently well known from the prior art. In the case of known grinding disc tools, grinding bristles can for example be moulded on a plastic base essentially constituted plate-shaped or grinding filaments can be embedded in a plastic matrix. Such a grinding brush, wherein grinding bristles with abrasive particles are moulded on a plastic base, is disclosed for example in US 6,179,887 Bl, wherein the grinding surface with this kind of grinding brushes is formed by the ends of the bristles at the free-end side. DE 196 50 393 Al in turn describes a grinding tool, wherein a bundle of grinding monofilaments is attached to a hub and the grinding monofilaments attached to the hub are embedded in an elastomer foam. With their tips facing away from the hub, the embedded grinding monofilaments form an annular or cylindrical grinding surface.
Furthermore, a grinding tool is known from WO 2005/115716 Al, which is produced by means of an injection moulding process. To produce the grinding tool of WO
2005/115716 Al, particles of an abrasive granulate or an abrasive agglomerate are scattered into an injection mould and thermoplastic elastomer material is then injected into the injection mould, so that the particles of the abrasive granulate are present embedded in the thermoplastic elastomer material.
A drawback, however, is that the aforementioned grinding tools often do not produce the desired grinding performance, especially for specific purposes or in specific applications.
Grinding disc devices, i.e. grinding discs with carrier discs, are also known from the prior art, which usually comprise a carrier disc or support disc or a carrier plate with an abrasive grinding disc or grinding layer fastened or connected thereto. Such a grinding disc with a carrier disc is known for example from DE 10 2016 102 037 B4, wherein an abrasive grinding layer is applied to a rigid carrier disc made of polyamide or ABS, said grinding layer comprising grinding lamellas arranged fan-shaped.
In order to fasten the grinding layer on the carrier disc, use is made for example of an adhesive, which must ensure a durable connection between the grinding layer and the carrier disc. Such an adhesive must therefore satisfy a variety of conditions, in particular an unlimited strength even in a continuous operation and at high temperatures.
Furthermore, the fastening of the grinding layer by means of the adhesive on the carrier disc requires sufficient hardening, which delays production considerably.
Despite the solutions known from the prior art, there is therefore a need for easily and cost-effectively producible, improved grinding disc devices, which are suitable for the most diverse kinds of application and exhibit an adequate grinding performance.
Summary The problem of the present invention, therefore, is to provide a grinding disc device, which can easily be produced and provides an improved grinding performance and with which the drawbacks of the prior art caused by the adhesive are avoided without limitations.
In one aspect, there is provided a grinding disc device for a grinding apparatus, the grinding disc device comprising at least one grinding layer and a carrier disc fixedly connected to the grinding layer, wherein the grinding layer comprises at least one connection surface connected to the carrier disc and forms an abrasive grinding surface lying opposite the connection surface and facing away from the carrier disc wherein the carrier disc made of a plastic material is produced by means of injection moulding and is connected immediately and directly to the connection surface of the grinding layer, wherein the plastic material of the carrier disc is sprayed by means of injection moulding immediately and directly onto the connection surface of the grinding layer such that the carrier disc and the grinding layer are connected to one another in a materially-bonded manner.
In another aspect, there is provided a method for producing a grinding disc device for a grinding apparatus, the method comprising producing the grinding device by injection moulding, wherein a grinding layer with a connection surface and an opposite abrasive grinding surface is first provided and introduced into a suitable moulding tool of an injection moulding machine, in such a way that the connection surface of the grinding layer points in the direction of a predefined cavity of the moulding tool, wherein a carrier disc connected to the grinding layer is then formed by injecting a plastic material suitable
Background Grinding disc devices or grinding tools are sufficiently well known from the prior art. In the case of known grinding disc tools, grinding bristles can for example be moulded on a plastic base essentially constituted plate-shaped or grinding filaments can be embedded in a plastic matrix. Such a grinding brush, wherein grinding bristles with abrasive particles are moulded on a plastic base, is disclosed for example in US 6,179,887 Bl, wherein the grinding surface with this kind of grinding brushes is formed by the ends of the bristles at the free-end side. DE 196 50 393 Al in turn describes a grinding tool, wherein a bundle of grinding monofilaments is attached to a hub and the grinding monofilaments attached to the hub are embedded in an elastomer foam. With their tips facing away from the hub, the embedded grinding monofilaments form an annular or cylindrical grinding surface.
Furthermore, a grinding tool is known from WO 2005/115716 Al, which is produced by means of an injection moulding process. To produce the grinding tool of WO
2005/115716 Al, particles of an abrasive granulate or an abrasive agglomerate are scattered into an injection mould and thermoplastic elastomer material is then injected into the injection mould, so that the particles of the abrasive granulate are present embedded in the thermoplastic elastomer material.
A drawback, however, is that the aforementioned grinding tools often do not produce the desired grinding performance, especially for specific purposes or in specific applications.
Grinding disc devices, i.e. grinding discs with carrier discs, are also known from the prior art, which usually comprise a carrier disc or support disc or a carrier plate with an abrasive grinding disc or grinding layer fastened or connected thereto. Such a grinding disc with a carrier disc is known for example from DE 10 2016 102 037 B4, wherein an abrasive grinding layer is applied to a rigid carrier disc made of polyamide or ABS, said grinding layer comprising grinding lamellas arranged fan-shaped.
In order to fasten the grinding layer on the carrier disc, use is made for example of an adhesive, which must ensure a durable connection between the grinding layer and the carrier disc. Such an adhesive must therefore satisfy a variety of conditions, in particular an unlimited strength even in a continuous operation and at high temperatures.
Furthermore, the fastening of the grinding layer by means of the adhesive on the carrier disc requires sufficient hardening, which delays production considerably.
Despite the solutions known from the prior art, there is therefore a need for easily and cost-effectively producible, improved grinding disc devices, which are suitable for the most diverse kinds of application and exhibit an adequate grinding performance.
Summary The problem of the present invention, therefore, is to provide a grinding disc device, which can easily be produced and provides an improved grinding performance and with which the drawbacks of the prior art caused by the adhesive are avoided without limitations.
In one aspect, there is provided a grinding disc device for a grinding apparatus, the grinding disc device comprising at least one grinding layer and a carrier disc fixedly connected to the grinding layer, wherein the grinding layer comprises at least one connection surface connected to the carrier disc and forms an abrasive grinding surface lying opposite the connection surface and facing away from the carrier disc wherein the carrier disc made of a plastic material is produced by means of injection moulding and is connected immediately and directly to the connection surface of the grinding layer, wherein the plastic material of the carrier disc is sprayed by means of injection moulding immediately and directly onto the connection surface of the grinding layer such that the carrier disc and the grinding layer are connected to one another in a materially-bonded manner.
In another aspect, there is provided a method for producing a grinding disc device for a grinding apparatus, the method comprising producing the grinding device by injection moulding, wherein a grinding layer with a connection surface and an opposite abrasive grinding surface is first provided and introduced into a suitable moulding tool of an injection moulding machine, in such a way that the connection surface of the grinding layer points in the direction of a predefined cavity of the moulding tool, wherein a carrier disc connected to the grinding layer is then formed by injecting a plastic material suitable
2 for producing the carrier disc into the closed moulding tool at a predefined temperature and under a predefined pressure, such that the plastic material of the carrier disc is sprayed immediately and directly onto the connection surface of the grinding layer and the grinding disc device is thus produced Further advantageous aspects, details and embodiments of the invention emerge from the description and the drawings.
The present invention provides a grinding disc device for a grinding apparatus, which comprises at least one grinding layer and a carrier disc fixedly connected to the grinding layer. The grinding layer comprises on a first side at least one connection surface connected to the carrier disc and, with a second side lying opposite, forms an abrasive grinding surface lying opposite the connection surface and facing away from the carrier disc. The carrier disc made of a plastic material is produced by means of injection moulding and is connected immediately and directly to the connection surface of the grinding layer, wherein the plastic material of the carrier disc is sprayed by means of injection moulding immediately and directly onto the connection surface of the grinding layer, in such a way that the carrier disc and the grinding layer are connected to one another in a materially-bonded manner.
A grinding disc device for a grinding apparatus is essentially understood in the present case to mean a grinding disc with a carrier disc or carrier plate. In the sense of the present invention the grinding disc device is to be regarded as a grinding body, which can also be described as a grinding tool or grinding plate or as a carried or held or supported grinding disc. Such grinding disc is designed for a particularly rotating surface fine-machining and is configured for use in a grinding apparatus correspondingly driven rotationally or such machine tool, for example a grinding machine, in particular an angle grinder.
In the present case, the carrier disc can also be described as a carrier plate and is essentially to be understood as a support body, a support disc or a support plate. A
grinding layer, in the sense of the invention, is to be understood as an essentially flat or planar disc-like element or a flat or planar disc-like structure with a first side or side face and an opposite second side or side face. The first side face forms the connection surface, which is immediately and directly connected to the carrier disc, and the opposite second side face forms the outwardly orientated grinding surface which defines an underside of the grinding disc device. The grinding layer may consist of a single part, or also of a plurality of assembled parts, which together form the flat or planar disc-like structure.
The present invention provides a grinding disc device for a grinding apparatus, which comprises at least one grinding layer and a carrier disc fixedly connected to the grinding layer. The grinding layer comprises on a first side at least one connection surface connected to the carrier disc and, with a second side lying opposite, forms an abrasive grinding surface lying opposite the connection surface and facing away from the carrier disc. The carrier disc made of a plastic material is produced by means of injection moulding and is connected immediately and directly to the connection surface of the grinding layer, wherein the plastic material of the carrier disc is sprayed by means of injection moulding immediately and directly onto the connection surface of the grinding layer, in such a way that the carrier disc and the grinding layer are connected to one another in a materially-bonded manner.
A grinding disc device for a grinding apparatus is essentially understood in the present case to mean a grinding disc with a carrier disc or carrier plate. In the sense of the present invention the grinding disc device is to be regarded as a grinding body, which can also be described as a grinding tool or grinding plate or as a carried or held or supported grinding disc. Such grinding disc is designed for a particularly rotating surface fine-machining and is configured for use in a grinding apparatus correspondingly driven rotationally or such machine tool, for example a grinding machine, in particular an angle grinder.
In the present case, the carrier disc can also be described as a carrier plate and is essentially to be understood as a support body, a support disc or a support plate. A
grinding layer, in the sense of the invention, is to be understood as an essentially flat or planar disc-like element or a flat or planar disc-like structure with a first side or side face and an opposite second side or side face. The first side face forms the connection surface, which is immediately and directly connected to the carrier disc, and the opposite second side face forms the outwardly orientated grinding surface which defines an underside of the grinding disc device. The grinding layer may consist of a single part, or also of a plurality of assembled parts, which together form the flat or planar disc-like structure.
3 According to the present understanding, therefore, the connection surface and the grinding surface can also be constituted as non-plane surfaces and can for example comprise steps or graduations, offset edges or protruding regions, which may perhaps arise if a plurality of parts are arranged together in a preferably fan-shaped arrangement to form a flat structure.
To solve the aforementioned problem, according to the invention the carrier disc made of plastic is sprayed by means of an injection moulding process immediately and directly onto the grinding layer, i.e. onto the connection surface of the grinding layer, without an intermediate layer, in particular without an adhesive or bonding agent applied in between.
Compared to the prior art, this solution has the considerable advantage of straightforward and quick production, which essentially requires only one process step, i.e.
the injection moulding process or the forming by means of injection moulding and takes place without the frequently impracticable influences of an adhesive, because the plastic material of the carrier disc is sprayed directly onto the grinding layer. The essentially liquid, i.e.
plasticised, plastic material connects in an integrally, materially-bonded manner with the connection surface of the grinding layer, as a result of which, after only a short hardening time of less than a minute, a firm, durable connection between the two parts arises, which is also extremely durable at high speeds of the grinding disc device and therefore at high temperatures.
Due to the immediate and direct connection of the grinding layer to the carrier disc according to the invention, the present grinding disc device particularly advantageously has an improved grinding performance, since the bonding of the grinding layer to the carrier disc is thereby improved and is thus much more stable. This leads to an overall harder grinding disc device, in particular to a stabilised grinding surface with a greater degree of hardness. The grinding disc device according to the invention can thus advantageously be operated in a rotating manner in a grinding apparatus with the avoidance of disruptive vibrations, i.e. particularly advantageously vibration-free. This proves to be particularly advantageous, since such grinding apparatuses are operated at high speeds, for example in a range from 10,000 to 15,000 revolutions per minute, and the avoidance of vibrations at such high speeds leads to a particularly reliable and efficient operation.
In order to further improve the stability, in particular the dimensional stability and/or the rigidity of the grinding disc device, reinforcing structures can optionally be provided in
To solve the aforementioned problem, according to the invention the carrier disc made of plastic is sprayed by means of an injection moulding process immediately and directly onto the grinding layer, i.e. onto the connection surface of the grinding layer, without an intermediate layer, in particular without an adhesive or bonding agent applied in between.
Compared to the prior art, this solution has the considerable advantage of straightforward and quick production, which essentially requires only one process step, i.e.
the injection moulding process or the forming by means of injection moulding and takes place without the frequently impracticable influences of an adhesive, because the plastic material of the carrier disc is sprayed directly onto the grinding layer. The essentially liquid, i.e.
plasticised, plastic material connects in an integrally, materially-bonded manner with the connection surface of the grinding layer, as a result of which, after only a short hardening time of less than a minute, a firm, durable connection between the two parts arises, which is also extremely durable at high speeds of the grinding disc device and therefore at high temperatures.
Due to the immediate and direct connection of the grinding layer to the carrier disc according to the invention, the present grinding disc device particularly advantageously has an improved grinding performance, since the bonding of the grinding layer to the carrier disc is thereby improved and is thus much more stable. This leads to an overall harder grinding disc device, in particular to a stabilised grinding surface with a greater degree of hardness. The grinding disc device according to the invention can thus advantageously be operated in a rotating manner in a grinding apparatus with the avoidance of disruptive vibrations, i.e. particularly advantageously vibration-free. This proves to be particularly advantageous, since such grinding apparatuses are operated at high speeds, for example in a range from 10,000 to 15,000 revolutions per minute, and the avoidance of vibrations at such high speeds leads to a particularly reliable and efficient operation.
In order to further improve the stability, in particular the dimensional stability and/or the rigidity of the grinding disc device, reinforcing structures can optionally be provided in
4 the carrier disc, and more precisely at an upper side of the grinding disc device, which reinforcing structures can be constituted for example in the form of annular ribs. In addition or alternatively, structures for improving the elasticity of the grinding disc device, in particular for improving the elasticity during application when grinding, can also be provided, which structures can for example be constituted in the form of annular grooves.
According to a preferred embodiment, the grinding layer of the grinding disc device may consist of a flat, circular grinding disc, in particular a sanding disc. The grinding layer can then preferably be formed by a conventional, commercially available grinding disc, which usually comprises a carrier or carrier material and an abrasive medium applied thereon, wherein paper carriers, fabric carriers or vulcanised fibre carriers basically come into question as carriers and wherein the abrasive medium can for example be a ceramic grain. The side of the carrier which is loaded with the abrasive medium represents the grinding surface and the opposite, unloaded side of the carrier represents the connection surface. In this embodiment, the connection surface is thus essentially formed from the material of the carrier of the grinding disc.
Particularly preferably, the grinding layer is formed by a fibre disc, in particular a vulcanised fibre disc, wherein the grinding surface is formed particularly preferably by a scattered ceramic grain abrasive medium. Such grinding discs are produced and marketed for example by the firm "VSM Vereinigte Schmirgel- und Maschinen-Fabriken AG"
and are available in the market under the trade name "VSM CERAMICS
FiberscheibenTm".
In these particularly preferred embodiments, the carrier material of the vulcanised fibre carrier of the grinding disc forms the connection surface of the grinding layer for direct connection to the plastic material of the carrier disc.
The grinding layer can also be composed of grinding lamellas, which are arranged for example in a fan-shaped manner to form the flat structure of the grinding layer. In all cases, the plastic material for the carrier disc can be injected in the desired manner into the moulding tool of the injection moulding machine and sprayed directly onto the connection surface of the grinding layer.
The connection surface and the grinding surface lying opposite the connection surface are each preferably constituted at least as annular, essentially continuous surfaces. In the present case, this is understood in particular to mean that the two aforementioned surfaces,
According to a preferred embodiment, the grinding layer of the grinding disc device may consist of a flat, circular grinding disc, in particular a sanding disc. The grinding layer can then preferably be formed by a conventional, commercially available grinding disc, which usually comprises a carrier or carrier material and an abrasive medium applied thereon, wherein paper carriers, fabric carriers or vulcanised fibre carriers basically come into question as carriers and wherein the abrasive medium can for example be a ceramic grain. The side of the carrier which is loaded with the abrasive medium represents the grinding surface and the opposite, unloaded side of the carrier represents the connection surface. In this embodiment, the connection surface is thus essentially formed from the material of the carrier of the grinding disc.
Particularly preferably, the grinding layer is formed by a fibre disc, in particular a vulcanised fibre disc, wherein the grinding surface is formed particularly preferably by a scattered ceramic grain abrasive medium. Such grinding discs are produced and marketed for example by the firm "VSM Vereinigte Schmirgel- und Maschinen-Fabriken AG"
and are available in the market under the trade name "VSM CERAMICS
FiberscheibenTm".
In these particularly preferred embodiments, the carrier material of the vulcanised fibre carrier of the grinding disc forms the connection surface of the grinding layer for direct connection to the plastic material of the carrier disc.
The grinding layer can also be composed of grinding lamellas, which are arranged for example in a fan-shaped manner to form the flat structure of the grinding layer. In all cases, the plastic material for the carrier disc can be injected in the desired manner into the moulding tool of the injection moulding machine and sprayed directly onto the connection surface of the grinding layer.
The connection surface and the grinding surface lying opposite the connection surface are each preferably constituted at least as annular, essentially continuous surfaces. In the present case, this is understood in particular to mean that the two aforementioned surfaces,
5 in at least one annular section, form a continuous, closed surface without interruptions.
The annular, essentially continuous surface or the annular, continuous surface section preferably occupies more than half, particularly preferably more than 60% and with particular preference more than 70% of the total area of the underside of the grinding disc device. Very particularly preferably, the annular, continuous surface section has a surface segment area of more than 80% or more than 90% of the total area of the underside of the grinding disc device. On the one hand, the connection surface, onto which the plastic material of the carrier disc is sprayed, is thus constituted at least in an annular section as a continuous surface, which ensures a uniform and reliable connection between the grinding layer and the carrier disc. On the other hand, the grinding surface is sufficiently large to permit a good grinding performance and efficient use.
Particular advantages arise from the fact that the grinding surface of the grinding disc device, i.e. the grinding surface of the grinding layer connected to the carrier disc, is constituted dish-shaped. This is understood to mean that the grinding surface does not run even or flat in a plane, but rather has an arch or curvature. For example, the grinding surface is arched in a radial direction, starting from an edge of the grinding disc device in the direction towards the centre, and more precisely for example with a gradient angle in a range from approximately 3 to 10 , preferably in a range from approximately 4 to 7 and particularly preferably of around 5 .
According to a preferred embodiment of the present invention, slots are designed or formed in the carrier disc distributed over its periphery for the passage of cooling air.
Such slots are known for example from the aforementioned DE 10 2016 102 037 B4.
These slots provide, especially at high speeds, for an effective cooling air flow in the direction of the grinding layer and the machined work piece, without the durability and service life thereby being adversely affected. In a continuous operation, temperatures over 100 C can be tolerated over a long period.
In a development of the invention, the carrier disc is constituted in one piece with a hub part, from which ventilation ribs extend radially outwards. By means of the latter, a cooling air flow is additionally generated, which markedly reduces the working temperature.
Particularly preferably, the hub part comprises an inner thread for the fastening of the grinding disc device on a drive shaft of the grinding apparatus. Cooling air passage slots can also be fashioned into the hub part, which again assist efficient and effective cooling.
The annular, essentially continuous surface or the annular, continuous surface section preferably occupies more than half, particularly preferably more than 60% and with particular preference more than 70% of the total area of the underside of the grinding disc device. Very particularly preferably, the annular, continuous surface section has a surface segment area of more than 80% or more than 90% of the total area of the underside of the grinding disc device. On the one hand, the connection surface, onto which the plastic material of the carrier disc is sprayed, is thus constituted at least in an annular section as a continuous surface, which ensures a uniform and reliable connection between the grinding layer and the carrier disc. On the other hand, the grinding surface is sufficiently large to permit a good grinding performance and efficient use.
Particular advantages arise from the fact that the grinding surface of the grinding disc device, i.e. the grinding surface of the grinding layer connected to the carrier disc, is constituted dish-shaped. This is understood to mean that the grinding surface does not run even or flat in a plane, but rather has an arch or curvature. For example, the grinding surface is arched in a radial direction, starting from an edge of the grinding disc device in the direction towards the centre, and more precisely for example with a gradient angle in a range from approximately 3 to 10 , preferably in a range from approximately 4 to 7 and particularly preferably of around 5 .
According to a preferred embodiment of the present invention, slots are designed or formed in the carrier disc distributed over its periphery for the passage of cooling air.
Such slots are known for example from the aforementioned DE 10 2016 102 037 B4.
These slots provide, especially at high speeds, for an effective cooling air flow in the direction of the grinding layer and the machined work piece, without the durability and service life thereby being adversely affected. In a continuous operation, temperatures over 100 C can be tolerated over a long period.
In a development of the invention, the carrier disc is constituted in one piece with a hub part, from which ventilation ribs extend radially outwards. By means of the latter, a cooling air flow is additionally generated, which markedly reduces the working temperature.
Particularly preferably, the hub part comprises an inner thread for the fastening of the grinding disc device on a drive shaft of the grinding apparatus. Cooling air passage slots can also be fashioned into the hub part, which again assist efficient and effective cooling.
6 The carrier disc is preferably produced from a thermoplastic plastic, in particular from a thermoplastic polymer. For example, the carrier disc can be made from a thermoplastic terpolymer, preferably from an acrylnitrile-butadiene-styrene copolymer (ABS).
According to an alternative variant of embodiment, the carrier disc can be made from a polyamide, preferably from polyamide PA6, in particular from a glass fibre-reinforced PA6.
Polyamide PA6 is a thermoplastic, partially crystalline construction plastic, which can be processed as a tough, hard industrial material. The main properties are a high impact resistance, rigidity and a good damping capacity as well as a relatively high dimensional stability. As a result of a possible glass fibre reinforcement, for example with a glass fibre content of 30%, the plastic is ultimately even firmer and more rigid. As a result of the use of PA6 or PA6-GF30, the production of the grinding disc device can take place in the optimum manner by means of injection moulding, wherein the stability, strength and hardness of the grinding disc device are at the same time also matched in the optimum manner to the technical requirements.
The present invention also comprises a method for producing a grinding disc device for a grinding apparatus by means of injection moulding. In the method, a grinding layer with a connection surface and an opposite abrasive grinding surface is first provided and introduced into a suitable moulding tool of an injection moulding machine, in such a way that the connection surface of the grinding layer points in the direction of a predefined cavity of the moulding tool. A carrier disc directly connected to the grinding layer is then formed, wherein a plastic material suitable for producing the carrier disc is injected into the closed moulding tool at a predefined temperature and under pressure, and more precisely such that the plastic material of the carrier disc is sprayed immediately and directly onto the connection surface of the grinding layer and the grinding disc device is thus produced.
In injection moulding, which numbers among the primary shaping processes, a suitable material, in particular a plastic material is liquefied, i.e. plasticised, and injected under pressure with an injection moulding machine into a cavity of a corresponding mould, i.e.
into the moulding tool or injection moulding tool. The cavity thus represents the shaping hollow space. In the moulding tool, the plastic material transforms back into the solid state by cooling or a cross-linking reaction and can be removed as a finished part after the opening of the moulding tool.
According to an alternative variant of embodiment, the carrier disc can be made from a polyamide, preferably from polyamide PA6, in particular from a glass fibre-reinforced PA6.
Polyamide PA6 is a thermoplastic, partially crystalline construction plastic, which can be processed as a tough, hard industrial material. The main properties are a high impact resistance, rigidity and a good damping capacity as well as a relatively high dimensional stability. As a result of a possible glass fibre reinforcement, for example with a glass fibre content of 30%, the plastic is ultimately even firmer and more rigid. As a result of the use of PA6 or PA6-GF30, the production of the grinding disc device can take place in the optimum manner by means of injection moulding, wherein the stability, strength and hardness of the grinding disc device are at the same time also matched in the optimum manner to the technical requirements.
The present invention also comprises a method for producing a grinding disc device for a grinding apparatus by means of injection moulding. In the method, a grinding layer with a connection surface and an opposite abrasive grinding surface is first provided and introduced into a suitable moulding tool of an injection moulding machine, in such a way that the connection surface of the grinding layer points in the direction of a predefined cavity of the moulding tool. A carrier disc directly connected to the grinding layer is then formed, wherein a plastic material suitable for producing the carrier disc is injected into the closed moulding tool at a predefined temperature and under pressure, and more precisely such that the plastic material of the carrier disc is sprayed immediately and directly onto the connection surface of the grinding layer and the grinding disc device is thus produced.
In injection moulding, which numbers among the primary shaping processes, a suitable material, in particular a plastic material is liquefied, i.e. plasticised, and injected under pressure with an injection moulding machine into a cavity of a corresponding mould, i.e.
into the moulding tool or injection moulding tool. The cavity thus represents the shaping hollow space. In the moulding tool, the plastic material transforms back into the solid state by cooling or a cross-linking reaction and can be removed as a finished part after the opening of the moulding tool.
7 With the method according to the invention, the grinding layer, and more precisely for example in the form of a grinding disc, in particular a vulcanised fibre disc, is first introduced or placed into the cavity of the moulding tool of the injection moulding machine prior to the injection of the plastic material, namely in such a way that the connection surface of the grinding layer is facing the hollow space, i.e. the cavity or the lumen of the hollow space, that is to say that the side of the grinding surface lies against an inner wall or hollow-space wall of the moulding tool, as a result of which the grinding surface is facing outwards in the finished moulded part of the grinding disc device.
During the injection of the plastic material into the shaping hollow space, which injection takes place for example under a pressure in a range from 500 bar to 2000 bar and at a temperature in a range from 200 C to 330 C, the plastic material is sprayed directly onto the connection surface of the grinding layer, which is formed for example by the vulcanised fibre material of the vulcanised fibre carrier of the grinding disc used. No prior treatment of the connection surface whatsoever is required, i.e. any kind of use of additional binder or adhesive agents or adhesives, bonding agents or suchlike can be completely avoided.
As a result of the hardening in the injection moulding machine, the plastic material of the carrier disc hardens and is directly bonded or fixed to the connection surface of the grinding layer, in particular is connected in a materially-bonded manner to the latter.
The carrier disc is preferably constituted in one piece with a hub part by the injection moulding. In addition or alternatively, slots distributed over the periphery of the carrier disc for the passage of cooling air can also be formed by the injection moulding.
Particularly preferably, an inner thread is formed in the hub part for the fastening of the grinding disc device on a drive shaft of the grinding apparatus.
In addition or alternatively, the hub part can also be formed with corresponding cooling air passage slots.
With the method, a flat, circular vulcanised fibre disc with a scattered ceramic grain abrasive medium can for example be used as a grinding layer. At the same time, a glass fibre-reinforced polyamide PA6 as a plastic material for the carrier disc is sprayed onto
During the injection of the plastic material into the shaping hollow space, which injection takes place for example under a pressure in a range from 500 bar to 2000 bar and at a temperature in a range from 200 C to 330 C, the plastic material is sprayed directly onto the connection surface of the grinding layer, which is formed for example by the vulcanised fibre material of the vulcanised fibre carrier of the grinding disc used. No prior treatment of the connection surface whatsoever is required, i.e. any kind of use of additional binder or adhesive agents or adhesives, bonding agents or suchlike can be completely avoided.
As a result of the hardening in the injection moulding machine, the plastic material of the carrier disc hardens and is directly bonded or fixed to the connection surface of the grinding layer, in particular is connected in a materially-bonded manner to the latter.
The carrier disc is preferably constituted in one piece with a hub part by the injection moulding. In addition or alternatively, slots distributed over the periphery of the carrier disc for the passage of cooling air can also be formed by the injection moulding.
Particularly preferably, an inner thread is formed in the hub part for the fastening of the grinding disc device on a drive shaft of the grinding apparatus.
In addition or alternatively, the hub part can also be formed with corresponding cooling air passage slots.
With the method, a flat, circular vulcanised fibre disc with a scattered ceramic grain abrasive medium can for example be used as a grinding layer. At the same time, a glass fibre-reinforced polyamide PA6 as a plastic material for the carrier disc is sprayed onto
8 the grinding layer. The preferred glass fibre-reinforced polyamide PA6 has for example a glass fibre content of 30%.
Brief Description of the Drawings The invention will be explained below in greater detail with the aid of examples of embodiment in connection with the drawings.
Fig. 1 shows a diagrammatic plan view of a first example of embodiment of the grinding disc device according to the invention;
Fig. 2 shows a cross-section through the grinding disc device of figure 1;
Fig. 3 shows a perspective view of the grinding disc device of figure 1;
Fig. 4, Fig. 5 and Fig. 6 show an alternative embodiment of the grinding disc device according to the invention, again in plan view, in a cross-sectional representation and in a perspective view;
Fig. 7, Fig. 8 and Fig. 9 show a further alternative embodiment of the grinding disc device according to the invention, wherein the grinding layer comprises grinding lamellas, again in plan view, in a cross-sectional representation and in a perspective view;
Fig. 10, Fig. 11 and Fig. 12 show a further alternative embodiment of the grinding disc device according to the invention, wherein the grinding layer comprises grinding lamellas, and more precisely in a view from beneath, in a cross-sectional representation and in a perspective view from beneath;
Fig. 13, Fig. 14 and Fig. 15 show a further alternative embodiment of the grinding disc device according to the invention, wherein the grinding layer comprises grinding lamellas, again in a view from beneath, in a cross-sectional representation and in a perspective view from beneath;
Fig. 16, Fig. 17 and Fig. 18 show yet another embodiment of the grinding disc device according to the invention, again in plan view, in a cross-sectional representation and in a perspective view; and,
Brief Description of the Drawings The invention will be explained below in greater detail with the aid of examples of embodiment in connection with the drawings.
Fig. 1 shows a diagrammatic plan view of a first example of embodiment of the grinding disc device according to the invention;
Fig. 2 shows a cross-section through the grinding disc device of figure 1;
Fig. 3 shows a perspective view of the grinding disc device of figure 1;
Fig. 4, Fig. 5 and Fig. 6 show an alternative embodiment of the grinding disc device according to the invention, again in plan view, in a cross-sectional representation and in a perspective view;
Fig. 7, Fig. 8 and Fig. 9 show a further alternative embodiment of the grinding disc device according to the invention, wherein the grinding layer comprises grinding lamellas, again in plan view, in a cross-sectional representation and in a perspective view;
Fig. 10, Fig. 11 and Fig. 12 show a further alternative embodiment of the grinding disc device according to the invention, wherein the grinding layer comprises grinding lamellas, and more precisely in a view from beneath, in a cross-sectional representation and in a perspective view from beneath;
Fig. 13, Fig. 14 and Fig. 15 show a further alternative embodiment of the grinding disc device according to the invention, wherein the grinding layer comprises grinding lamellas, again in a view from beneath, in a cross-sectional representation and in a perspective view from beneath;
Fig. 16, Fig. 17 and Fig. 18 show yet another embodiment of the grinding disc device according to the invention, again in plan view, in a cross-sectional representation and in a perspective view; and,
9 Fig. 19, Fig. 20 and Fig. 21 show yet another embodiment of the grinding disc device according to the invention, again in plan view, in a cross-sectional representation and in a perspective view.
Detailed Description All the examples of embodiment described below have in common that grinding disc device 10 according to the invention comprises an essentially circular carrier disc 12, which is provided with an abrasive grinding layer 14, such that grinding layer 14 and carrier disc 12 are immediately and directly connected to one another without an intermediate layer. The side of grinding disc device 10 on which abrasive grinding layer 14 is arranged represents an underside U of grinding disc device 10, opposite which lies an upper side 0 defined by carrier disc 12.
Carrier disc 12 is produced by means of injection moulding and is directly sprayed onto grinding layer 14 thereby constituting grinding disc device 10 according to the invention.
Carrier disc 12 is made of plastic, for example ABS, since the material is food-safe, has a sufficient elasticity, and has a long life. Other injectable plastics can also be used for carrier disc 12. Particularly preferably, carrier disc 12 is made of a polyamide, in particular of polyamide PA6, very particularly preferably of glass fibre-reinforced polyamide with for example a 30% glass fibre content, such as for example PA6-GF30.
In injection moulding, which numbers among the primary shaping processes, the plastic for carrier disc 12, for example ABS or PA6, is plasticised and injected under pressure with an injection moulding machine into a shaping hollow space, i.e. the cavity of the moulding tool. The plastic material transforms back into the solid state by cooling. For the production of grinding disc device 10 according to the invention, grinding layer 14 is first placed into the cavity of the moulding tool prior to the injection of the plastic material, in such a way that the side of grinding layer 14 forming a grinding surface Fs lies against an inner wall of the cavity and a connection surface Fv of grinding layer 14 is thus facing the hollow space. The subsequent injection of the plastic material into the shaping hollow space takes place under pressure in a range from 500 bar to 2000 bar and at a temperature in a range from 200 C to 330 C. The plastic material is thus sprayed directly onto connection surface Fv of grinding layer 14. As a result of the hardening in the injection moulding machine, the plastic material of grinding disc 12 solidifies and is directly bonded to connection surface VF of grinding layer 14 or is connected in a material-locking manner to the latter.
In the example of embodiment of figures 1 to 3, grinding layer 14, comprising a connection surface Fv and a grinding surface Fs, consists of a flat, circular sanding disc 16, wherein carrier disc 12 is sprayed directly by injection moulding onto connection surface Fv of grinding layer 14 or sanding disc 16 without plastic being applied between the two latter. This takes place by means of injection moulding in a suitable injection moulding machine as described above.
Grinding layer 14 is first introduced or placed into the hollow space of the moulding tool, and more precisely such that connection surface Fv of grinding layer 14 is facing the hollow space, i.e. grinding surface Fs is facing an inner wall or hollow-space wall of the moulding tool and in particular lies against the latter. The plasticised plastic material of carrier disc 12 is then injected into the cavity under pressure and at raised temperature.
Following a short hardening time of less than one minute, the plastic of carrier disc 12 is hard and firmly connected in a durable manner to sanding disc 16 or grinding layer 14.
In the example of embodiment of figure 1 to figure 3, a hub part 18 is formed in one piece with carrier disc 12 at upper side 0 of grinding disc device 10, from which hub part ventilation ribs 20 extend radially outwards. The latter provide for a sufficient cooling air flow over the surface of carrier plate 12 at the speeds generated during operation.
As figures 2 and 3 show, hub part 18 comprises an inner thread 22, which is also formed in the injection moulding, so that carrier disc 12 can be fastened on a drive shaft of a grinding apparatus, in particular a grinding machine, such as for example an angle grinder.
Essentially annular grinding layer 14, which comprises a central perforation in the region of hub part 18, comprises an annular, continuous connection surface Fv and an annular, continuous grinding surface Fs, wherein the circular surfaces extend over more than 90%
of the total area of underside U of grinding disc device 10.
For further, improved cooling, slots 24 are designed or formed in carrier disc 12 of the represented example distributed over its outer periphery or over upper side 0, which slots provide for the passage of cooling air both against connection surface Fv of grinding layer 14, which can also be seen as the inner surface, as well as against the machined work piece. Cooling air slots 24 are fashioned according to the teaching known from 2016 102 037 B4 and will not be explained again here.
Figures 4 to 6 show a variant of the embodiment of figure 1 to figure 3, wherein carrier disc 12 is also sprayed directly and without adhesive onto grinding layer 14.
Diverging from the example of figure 1 to figure 3, central hub part 18 is constituted here flat dish-shaped and has ventilation ribs. In this example of embodiment of figures 4 to 6, the central perforation of grinding layer 14 in the region of hub part 18 is larger than in the example of figures 1 to 3, so that the surface segment area of annular, continuous connection surface Fy and grinding surface Fs in the total area of underside U
of grinding disc device 10 is smaller than in the example of figures 1 to 3.
In the alternative, also preferred variant of figures 7 to 9, grinding layer 14 comprises grinding lamellas 26 arranged fan-shaped, onto which the plastic of carrier disc 12 is also sprayed without an intermediate adhesive. Grinding lamellas 26 arranged fan-shaped again form a flat grinding layer 14 with connection surface Fy and grinding surface Fs, which are also constituted in this embodiment as respective annular, continuous surfaces on account of the overlaps of grinding lamellas 26 arranged fan-shaped.
In the embodiment of figures 10 to 12, hub part 18, in the same way as in the example of embodiment of figures 4 to 6, does not have any ventilation ribs. The air slots at the outer periphery of carrier disc 12 are also absent in this example of embodiment.
Figures 13 to 15 show a modified embodiment with a carrier disc 12 constituted similar to the example of figures 4 to 6, wherein here, as also in the example of figures 10 to 12, grinding layer 14 comprises grinding lamellas 26 arranged fan-shaped, onto which carrier .. disc 12 is directly sprayed.
Finally, figures 16 to 18 show an embodiment with a carrier disc 12, which has cooling air slots 24 at the outer periphery for the passage of cooling air and in which the flat, roughly dish-shaped hub 18 also comprises, in addition to ventilation ribs 20, cooling air passage slots 28 for the passage of cooling air. Grinding layer 14 comprises here grinding lamellas 26 arranged fan-shaped.
In figures 19 to 21, an example of embodiment of grinding disc device 10 is shown, wherein grinding layer 14 is formed by a grinding disc or a sanding disc 16.
The grinding disc is a vulcanised fibre disc, wherein grinding surface Fs is formed by a scattered ceramic grain abrasive medium.
In the case of grinding disc device 10 of the example of figures 19 to 21, hub part 18 is constituted with ventilation ribs 20 and with an inner thread 22. No cooling air slots are provided however in carrier disc 12.
For the additional improvement of the stability, rigidity and bending strength, reinforcing structures are constituted on carrier disc 12 at upper side 0 of grinding disc device 10, and more precisely in the represented example in the form of an annular rib 30.
Furthermore, an annular groove 32 is provided, which serves to improve the elasticity during grinding.
List of reference numbers
Detailed Description All the examples of embodiment described below have in common that grinding disc device 10 according to the invention comprises an essentially circular carrier disc 12, which is provided with an abrasive grinding layer 14, such that grinding layer 14 and carrier disc 12 are immediately and directly connected to one another without an intermediate layer. The side of grinding disc device 10 on which abrasive grinding layer 14 is arranged represents an underside U of grinding disc device 10, opposite which lies an upper side 0 defined by carrier disc 12.
Carrier disc 12 is produced by means of injection moulding and is directly sprayed onto grinding layer 14 thereby constituting grinding disc device 10 according to the invention.
Carrier disc 12 is made of plastic, for example ABS, since the material is food-safe, has a sufficient elasticity, and has a long life. Other injectable plastics can also be used for carrier disc 12. Particularly preferably, carrier disc 12 is made of a polyamide, in particular of polyamide PA6, very particularly preferably of glass fibre-reinforced polyamide with for example a 30% glass fibre content, such as for example PA6-GF30.
In injection moulding, which numbers among the primary shaping processes, the plastic for carrier disc 12, for example ABS or PA6, is plasticised and injected under pressure with an injection moulding machine into a shaping hollow space, i.e. the cavity of the moulding tool. The plastic material transforms back into the solid state by cooling. For the production of grinding disc device 10 according to the invention, grinding layer 14 is first placed into the cavity of the moulding tool prior to the injection of the plastic material, in such a way that the side of grinding layer 14 forming a grinding surface Fs lies against an inner wall of the cavity and a connection surface Fv of grinding layer 14 is thus facing the hollow space. The subsequent injection of the plastic material into the shaping hollow space takes place under pressure in a range from 500 bar to 2000 bar and at a temperature in a range from 200 C to 330 C. The plastic material is thus sprayed directly onto connection surface Fv of grinding layer 14. As a result of the hardening in the injection moulding machine, the plastic material of grinding disc 12 solidifies and is directly bonded to connection surface VF of grinding layer 14 or is connected in a material-locking manner to the latter.
In the example of embodiment of figures 1 to 3, grinding layer 14, comprising a connection surface Fv and a grinding surface Fs, consists of a flat, circular sanding disc 16, wherein carrier disc 12 is sprayed directly by injection moulding onto connection surface Fv of grinding layer 14 or sanding disc 16 without plastic being applied between the two latter. This takes place by means of injection moulding in a suitable injection moulding machine as described above.
Grinding layer 14 is first introduced or placed into the hollow space of the moulding tool, and more precisely such that connection surface Fv of grinding layer 14 is facing the hollow space, i.e. grinding surface Fs is facing an inner wall or hollow-space wall of the moulding tool and in particular lies against the latter. The plasticised plastic material of carrier disc 12 is then injected into the cavity under pressure and at raised temperature.
Following a short hardening time of less than one minute, the plastic of carrier disc 12 is hard and firmly connected in a durable manner to sanding disc 16 or grinding layer 14.
In the example of embodiment of figure 1 to figure 3, a hub part 18 is formed in one piece with carrier disc 12 at upper side 0 of grinding disc device 10, from which hub part ventilation ribs 20 extend radially outwards. The latter provide for a sufficient cooling air flow over the surface of carrier plate 12 at the speeds generated during operation.
As figures 2 and 3 show, hub part 18 comprises an inner thread 22, which is also formed in the injection moulding, so that carrier disc 12 can be fastened on a drive shaft of a grinding apparatus, in particular a grinding machine, such as for example an angle grinder.
Essentially annular grinding layer 14, which comprises a central perforation in the region of hub part 18, comprises an annular, continuous connection surface Fv and an annular, continuous grinding surface Fs, wherein the circular surfaces extend over more than 90%
of the total area of underside U of grinding disc device 10.
For further, improved cooling, slots 24 are designed or formed in carrier disc 12 of the represented example distributed over its outer periphery or over upper side 0, which slots provide for the passage of cooling air both against connection surface Fv of grinding layer 14, which can also be seen as the inner surface, as well as against the machined work piece. Cooling air slots 24 are fashioned according to the teaching known from 2016 102 037 B4 and will not be explained again here.
Figures 4 to 6 show a variant of the embodiment of figure 1 to figure 3, wherein carrier disc 12 is also sprayed directly and without adhesive onto grinding layer 14.
Diverging from the example of figure 1 to figure 3, central hub part 18 is constituted here flat dish-shaped and has ventilation ribs. In this example of embodiment of figures 4 to 6, the central perforation of grinding layer 14 in the region of hub part 18 is larger than in the example of figures 1 to 3, so that the surface segment area of annular, continuous connection surface Fy and grinding surface Fs in the total area of underside U
of grinding disc device 10 is smaller than in the example of figures 1 to 3.
In the alternative, also preferred variant of figures 7 to 9, grinding layer 14 comprises grinding lamellas 26 arranged fan-shaped, onto which the plastic of carrier disc 12 is also sprayed without an intermediate adhesive. Grinding lamellas 26 arranged fan-shaped again form a flat grinding layer 14 with connection surface Fy and grinding surface Fs, which are also constituted in this embodiment as respective annular, continuous surfaces on account of the overlaps of grinding lamellas 26 arranged fan-shaped.
In the embodiment of figures 10 to 12, hub part 18, in the same way as in the example of embodiment of figures 4 to 6, does not have any ventilation ribs. The air slots at the outer periphery of carrier disc 12 are also absent in this example of embodiment.
Figures 13 to 15 show a modified embodiment with a carrier disc 12 constituted similar to the example of figures 4 to 6, wherein here, as also in the example of figures 10 to 12, grinding layer 14 comprises grinding lamellas 26 arranged fan-shaped, onto which carrier .. disc 12 is directly sprayed.
Finally, figures 16 to 18 show an embodiment with a carrier disc 12, which has cooling air slots 24 at the outer periphery for the passage of cooling air and in which the flat, roughly dish-shaped hub 18 also comprises, in addition to ventilation ribs 20, cooling air passage slots 28 for the passage of cooling air. Grinding layer 14 comprises here grinding lamellas 26 arranged fan-shaped.
In figures 19 to 21, an example of embodiment of grinding disc device 10 is shown, wherein grinding layer 14 is formed by a grinding disc or a sanding disc 16.
The grinding disc is a vulcanised fibre disc, wherein grinding surface Fs is formed by a scattered ceramic grain abrasive medium.
In the case of grinding disc device 10 of the example of figures 19 to 21, hub part 18 is constituted with ventilation ribs 20 and with an inner thread 22. No cooling air slots are provided however in carrier disc 12.
For the additional improvement of the stability, rigidity and bending strength, reinforcing structures are constituted on carrier disc 12 at upper side 0 of grinding disc device 10, and more precisely in the represented example in the form of an annular rib 30.
Furthermore, an annular groove 32 is provided, which serves to improve the elasticity during grinding.
List of reference numbers
10 grinding disc device 12 carrier disc 14 grinding layer 16 grinding disc or sanding disc 18 hub part ventilation rib 22 inner thread 20 24 cooling air slots 26 grinding lamellas 28 cooling air passage slots annular rib 32 annular groove Fs grinding surface Fv connection surface 0 upper
Claims (18)
1. A grinding disc device for a grinding apparatus, the grinding disc device comprising at least one grinding layer and a carrier disc fixedly connected to the grinding layer, wherein the grinding layer comprises at least one connection surface connected to the carrier disc and forms an abrasive grinding surface lying opposite the connection surface and facing away from the carrier disc wherein the carrier disc made of a plastic material is produced by means of injection moulding and is connected immediately and directly to the connection surface of the grinding layer, wherein the plastic material of the carrier disc is sprayed by means of injection moulding immediately and directly onto the connection surface of the grinding layer such that the carrier disc and the grinding layer are connected to one another in a materially-bonded manner, wherein the grinding layer is formed by a vulcanised fibre disc, wherein the carrier disc is constituted in one piece with a hub part comprising an inner thread for fastening of the grinding disc device on a drive shaft of the grinding apparatus and wherein the grinding surface of the grinding layer connected to the carrier disc is arched in a radial direction starting from an edge of the grinding disc device towards a centre of the grinding disc device.
2. The grinding disc device according to claim 1, wherein the grinding surface is arched with a gradient angle in a range from 3° to 10°.
3. The grinding disc device according to claim 1 or claim 2, wherein the connection surface and the grinding surface lying opposite the connection surface are each essentially continuous, annular surfaces.
4. The grinding disc device according to any one of claims 1 to 3, wherein the grinding surface is formed by a ceramic grain abrasive medium scattered on a carrier material.
5. The grinding disc device according to any one of claims 1 to 4, wherein cooling air slots are formed in the carrier disc distributed over its periphery for the passage of cooling air.
6. The grinding disc device according to any one of claims 1 to 5, wherein ventilation ribs extend radially outwards from the hub part.
7. The grinding disc device according to claim 6, wherein cooling air passage slots are also formed into the hub part.
8. The grinding disc device according to of claims 1 to 7, wherein the carrier disc is produced from a thermoplastic plastic.
9. The grinding disc device according to of claims 1 to 7, wherein the carrier disc is produced from a thermoplastic polymer.
10. The grinding disc device according to claim 8 or claim 9, wherein the carrier disc is made from a thermoplastic terpolymer.
11. The grinding disc device according to claim 8 or claim 9, wherein the carrier disc is made from an acrylonitrile-butadiene-styrene copolymer (ABS).
12. The grinding disc device according to claim 8 or claim 9, wherein the carrier disc is made from a polyamide PA6.
13. The grinding disc device according to claim 8 or claim 9, wherein the carrier disc is made from a glass fibre-reinforced polyamide PA6.
14. A method for producing a grinding disc device for a grinding apparatus, the method comprising producing the grinding device by injection moulding, wherein a grinding layer with a connection surface and an opposite abrasive grinding surface is first provided and introduced into a suitable moulding tool of an injection moulding machine, in such a way that the connection surface of the grinding layer points in the direction of a predefined cavity of the moulding tool, wherein a carrier disc connected to the grinding layer is then formed by injecting a plastic material suitable for producing the carrier disc into the closed moulding tool at a predefined temperature and under a predefined pressure, such that the plastic material of the carrier disc is sprayed immediately and directly onto the connection surface of the grinding layer and the grinding disc device is thus produced, wherein the grinding layer is formed by a vulcanised fibre disc, wherein the carrier disc is constituted in one piece with a hub part comprising an inner thread for fastening of the grinding disc device on a drive shaft of the grinding apparatus and wherein the grinding surface of the grinding layer connected to the carrier disc is arched in a radial direction starting from an edge of the grinding disc device towards a centre of the grinding disc device.
15. The method according to claim 14, wherein slots distributed over the periphery of the carrier disc are formed for the passage of cooling air.
16. The method according to claim 14 or claim 15, wherein the hub part is formed with corresponding cooling air passage slots.
17. The method according to any one of claims 14 to 16, wherein the grinding layer further comprises a scattered grain abrasive medium with the vulcanised fibre disc, and wherein a glass fibre-reinforced polyamide PA6 as a plastic material for the carrier disc is sprayed onto the grinding layer.
18. The method according to any one of claims 14 to 17, wherein the grinding surface is arched with a gradient angle in a range from 3° to 10°.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202017107425.0U DE202017107425U1 (en) | 2017-12-06 | 2017-12-06 | grinding wheel |
| DEDE202017107425.0 | 2017-12-06 | ||
| DE102018116242.1A DE102018116242A1 (en) | 2017-12-06 | 2018-07-04 | Grinding wheel device for a grinding device |
| DEDE102018116242.1 | 2018-07-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA3017577A1 CA3017577A1 (en) | 2019-06-06 |
| CA3017577C true CA3017577C (en) | 2020-12-15 |
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ID=60889739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3017577A Active CA3017577C (en) | 2017-12-06 | 2018-09-17 | Grinding disc device for a grinding apparatus |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20190168361A1 (en) |
| CA (1) | CA3017577C (en) |
| DE (2) | DE202017107425U1 (en) |
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|---|---|---|---|---|
| CN110587499A (en) * | 2019-09-12 | 2019-12-20 | 扬中市红洲磨具有限公司 | Novel cymbal type grinding wheel |
| KR102384837B1 (en) * | 2020-08-12 | 2022-04-08 | 송준철 | Eco wheel paper of a grinder |
| US20220080555A1 (en) * | 2020-09-16 | 2022-03-17 | ÜÇER ZIMPARA TASI SAN.ve TIC.LTD.STI. | Bilateral abrasive disc pad |
| US20230079249A1 (en) * | 2021-09-15 | 2023-03-16 | Kenneth Luna | Support assembly for surface treatment pad |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2033263A (en) * | 1927-12-07 | 1936-03-10 | Carborundum Co | Abrasive article |
| US2451295A (en) * | 1944-11-08 | 1948-10-12 | Super Cut | Abrasive wheel |
| US2534805A (en) * | 1947-03-10 | 1950-12-19 | Behr Manning Corp | Coated abrasive articles and backings for such articles |
| US2716312A (en) * | 1953-03-09 | 1955-08-30 | Elmer W Speicher | Truing device for face-type diamond abrasive wheels |
| ATE51354T1 (en) * | 1985-02-28 | 1990-04-15 | Diamant Boart Sa | GRINDING DISC FOR PROCESSING AND POLISHING GLASS. |
| US5529528A (en) * | 1994-08-26 | 1996-06-25 | Vaporless Manufacturing, Inc. | Saw blade with sanding surface |
| US5895612A (en) | 1996-01-11 | 1999-04-20 | Jason Incorporated | Method of making abrading tools |
| US6179887B1 (en) | 1999-02-17 | 2001-01-30 | 3M Innovative Properties Company | Method for making an abrasive article and abrasive articles thereof |
| GB0411268D0 (en) | 2004-05-20 | 2004-06-23 | 3M Innovative Properties Co | Method for making a moulded abrasive article |
| DE202015100548U1 (en) | 2015-02-05 | 2015-02-26 | Industrias Tenazit, S.A. De C.V. | Support plate for lamella grinding wheels |
-
2017
- 2017-12-06 DE DE202017107425.0U patent/DE202017107425U1/en not_active Expired - Lifetime
-
2018
- 2018-07-04 DE DE102018116242.1A patent/DE102018116242A1/en not_active Withdrawn
- 2018-09-17 US US16/132,994 patent/US20190168361A1/en not_active Abandoned
- 2018-09-17 CA CA3017577A patent/CA3017577C/en active Active
Also Published As
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|---|---|
| DE102018116242A1 (en) | 2019-06-06 |
| DE202017107425U1 (en) | 2017-12-20 |
| US20190168361A1 (en) | 2019-06-06 |
| CA3017577A1 (en) | 2019-06-06 |
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