EP3657976B1 - Outil abrasif et utilisation dudit outil abrasif - Google Patents

Outil abrasif et utilisation dudit outil abrasif Download PDF

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Publication number
EP3657976B1
EP3657976B1 EP18742484.1A EP18742484A EP3657976B1 EP 3657976 B1 EP3657976 B1 EP 3657976B1 EP 18742484 A EP18742484 A EP 18742484A EP 3657976 B1 EP3657976 B1 EP 3657976B1
Authority
EP
European Patent Office
Prior art keywords
abrasive
core
tool according
shaft
plastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18742484.1A
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German (de)
English (en)
Other versions
EP3657976A1 (fr
Inventor
Gerd Fischer
Bernhard Runden
Sebastian SCHWARK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lukas Erzett & Co KG GmbH
Original Assignee
Lukas Erzett & Co Kg GmbH
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Filing date
Publication date
Application filed by Lukas Erzett & Co Kg GmbH filed Critical Lukas Erzett & Co Kg GmbH
Priority to PL18742484T priority Critical patent/PL3657976T3/pl
Publication of EP3657976A1 publication Critical patent/EP3657976A1/fr
Application granted granted Critical
Publication of EP3657976B1 publication Critical patent/EP3657976B1/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D29/00—Manicuring or pedicuring implements
    • A45D29/04—Nail files, e.g. manually operated
    • A45D29/05—Nail files, e.g. manually operated motor-driven
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D29/00—Manicuring or pedicuring implements
    • A45D29/11—Polishing devices for nails
    • A45D29/14—Polishing devices for nails motor-driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/001—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as supporting member
    • B24D3/002—Flexible supporting members, e.g. paper, woven, plastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • B24D3/346—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties utilised during polishing, or grinding operation
    • 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
    • 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
    • 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
    • B24D9/02—Expansible drums for carrying flexible material in tubular form, e.g. expanded by centrifugal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D2205/00—Grinding tools with incorporated marking device

Definitions

  • the invention relates to a grinding tool with an abrasive carrier which has a shaft for connecting the abrasive carrier to a drive device for driving the abrasive carrier in rotation about a longitudinal axis and a core which is connected to an axial end of the shaft. Furthermore, the grinding tool comprises a grinding means which has a surface which is closed in the circumferential direction about the longitudinal axis and which encloses a cavity extending along the longitudinal axis. The core of the abrasive carrier is at least partially received in the cavity.
  • the present invention also relates to the use of such a grinding tool.
  • the abrasive carriers used in the prior art which are also called mandrels, are usually expanding bodies made of slotted rubber with an embedded metal shaft for connecting the abrasive carrier to a drive device.
  • the slots running in the longitudinal direction are intended to simplify the attachment or removal of the abrasive means closed in the circumferential direction, for example a seamless abrasive cap or an abrasive tape, onto or from the abrasive medium carrier.
  • the abrasive carrier clamped in the drive device is rotated around the longitudinal axis.
  • the slotted abrasive carrier fans out and, due to the centrifugal forces acting, presses against the surface of the abrasive, which is closed in the circumferential direction.
  • the material rubber has a low temperature and has dimensional stability, so that the abrasive carrier made of rubber can contract due to the frictional heat generated during grinding.
  • the expansion effect desired by fanning out the slotted abrasive carrier is partially compensated for by the contraction of the rubber under the influence of heat.
  • the speed of the drive machine drops regularly, so that the centrifugal forces acting on the abrasive carrier are reduced.
  • abrasive carriers made of metallic materials are known in the prior art. These offer the advantage of maximum temperature stability. However, these have a higher dead weight and have a hard and unyielding surface.
  • the static friction between the abrasive carrier and the abrasive is significantly lower in the case of metal abrasive carriers compared to those made of rubber, so that clamping devices are necessary to hold the abrasive securely on the abrasive carrier when it rotates. Such clamping devices are expensive and complex to handle.
  • the grinding rollers have a multi-part core with two core sections and an abrasive held between the core sections.
  • the hollow cylindrical abrasive is made of a solid foam and has abrasive material on its outside.
  • the abrasive material lined with foam means that the abrasive can adapt to the contour of the part of the body to be treated, for example to a fingernail.
  • the US 7,493,670 B1 shows a polishing tool with an abrasive carrier made of an elastic core which can be connected to a drive device via a shaft.
  • the elastic core can consist of closed-pore polyurethane, the shaft being cast in the core.
  • a cotton sack filled with an abrasive or polishing agent can be pulled over the core and can be attached to the abrasive carrier by pulling a cord guided in a drawstring.
  • a grinding cup wheel with a hardened resin-based core is known, the core containing large amounts of metal particles to increase the thermal conductivity, namely 40 to 90% by volume of aluminum and / or copper powder and 35 to 2% by volume of tin and / or Tin alloy.
  • the FR 2 020 424 A1 discloses a grinding tool such as a grinding wheel, a cutting wheel or a grindstone with diamond in the form of particles as an abrasive.
  • the known grinding tool should essentially consist of two parts, namely a grinding part and a carrier.
  • the diamond particles are embedded in a metal phase, the metal phase having a defined porosity between 10% and 50%. These pores are filled with a resin material.
  • the same resin material is also used to make the carrier.
  • the resin material should be placed in a mold for the carrier before the resin material has hardened in the pores of the metal phase in the grinding part.
  • the object of the present invention is to provide an improved abrasive tool which is easier to handle and reliably prevents heat-related damage to the abrasive carrier or the object to be processed, even in the case of longer grinding cycles.
  • the invention is based on the idea that a plastic is heat-insulating and thus only allows short grinding cycles to prevent heat-related damage to the abrasive carrier or the object to be processed, in particular to a workpiece or a part of the patient's body to be treated.
  • the task is thereby achieved by means of an abrasive carrier of the type mentioned at the beginning solved that the core consists of a material mixture which has a plastic with a thermally conductive filler, wherein the filler has a thermal conductivity greater than 35 watts per meter and per Kelvin.
  • the plastic is foamed.
  • the material mixture of the core has a plastic-based foam material.
  • the object is achieved by a grinding tool of the type mentioned in that the core of the abrasive carrier consists of a material mixture that has a foamed plastic with a thermally conductive filler, the filler having a thermal conductivity greater than 35 watts per meter and per Kelvin.
  • the entire core is preferably based on elastic plastic, to which the thermally conductive filler is added to increase the thermal conductivity in a targeted manner.
  • the filler can distribute the thermal energy absorbed on the outer surface of the abrasive backing throughout the core.
  • the outer surface of the abrasive carrier cools down more quickly, so that the frictional heat generated on the abrasive during operation of the abrasive is transported away from the abrasive into the core.
  • longer grinding cycles are possible without the object to be processed or treated, the abrasive carrier itself or the abrasive being damaged by heat.
  • the faster cooling enables the pauses between the individual grinding cycles to be shortened.
  • the removal rate of the grinding tool and the average service life of the abrasive carrier could be increased significantly compared to known abrasive carriers made of rubber without thermally conductive filler. As a result, a safer and more efficient grinding is achieved overall.
  • Thermal conductivity describes the ability of a material to transport thermal energy by means of thermal conduction. This is expressed by the coefficient of thermal conductivity ⁇ in watts per meter and per Kelvin ( W / mK). It has been shown that with a core made, for example, of flexible polyurethane (PUR for short), in particular of flexible PUR foam, an abrasive carrier that patients perceive as pleasant can be provided. In principle, however, the core can also be made of elastic PUR rigid foam or another plastic that is elastic in the foamed or non-foamed state.
  • PUR flexible polyurethane
  • the polyurethane foam mentioned here as an example has a low coefficient of thermal conductivity ⁇ of around 0.04 W / mK , the coefficient of thermal conductivity only being marginally dependent on the density of the foam.
  • the filler has a thermal conductivity greater than 35 watts per meter and per Kelvin, in particular greater than 80 watts per meter and per Kelvin.
  • the foamed plastic Since foam is generally formed from gaseous bubbles enclosed by solid or liquid walls, the foamed plastic has a low inherent weight. This significantly reduces the weight of the core compared to a non-foamed plastic. This is advantageous because in this way the weight introduced by the filler, especially if it is a metal or mineral filler, can be partially compensated for.
  • the volume of the foamed plastic can be about 70% to 95% of the total volume of the core, the volume of the filler and the volume of any functional additive added together amounting to a maximum of 30% of the total volume.
  • the core continues to be elastic.
  • the production of the core from a plastic-based foam material, in which the fillers are incorporated provides an abrasive carrier with a significantly lighter overall weight.
  • the filler is preferably inorganic, in particular metallic or mineral.
  • the filler can be added to the plastic in powder form or in liquid form.
  • the filler can be, for example, silver, copper or another highly thermally conductive metal. Particularly good results were also achieved with silicon carbide.
  • carbon nanotubes can also be used, which have a particularly light weight and highly thermally conductive properties.
  • the filler can also be a mixture of different thermally conductive materials.
  • the filler can introduce further advantageous properties into the core in addition to the preferred heat conduction.
  • silver, in particular colloidal silver has an additional antibacterial and / or antifungal effect.
  • abrasive backing is used on patients.
  • Particularly good results have been achieved when the filler is homogeneously distributed in the core.
  • a radially outer section of the core can have a higher concentration of the filler compared to the rest of the core.
  • the particularly elastic plastic or synthetic resin can be, for example, polyurethane.
  • elastic polymers, silicones, synthetically produced rubber or natural rubber are also suitable.
  • foamed Plastics this can preferably be a one- or two-component plastic. Particularly good results have been achieved with two-component plastics, which harden more evenly and foam more intensely by means of a chemical reaction between the two components.
  • the plastic can also be foamed using blowing agents. It is advantageous if the filler can be added to the at least one component of the plastic before the plastic is foamed, so that the filler is distributed as homogeneously as possible in the core. In addition, it has been shown that the core with foamed plastic is particularly temperature-stable.
  • the shaft In order to connect the especially elongated, cylindrical shaft to the core, it can be cast or injected into the core.
  • the shaft can already be held in the material mixture when the core is being manufactured.
  • an adhesion promoter can be applied to the axial end of the shaft beforehand.
  • the axial end of the shaft can have embossments which serve to anchor the core on the shaft.
  • an abrasive carrier is provided in which the shaft is permanently connected to the core and can only be separated from the shaft by destroying the core.
  • the shaft can be made of a material, in particular metal, which has a higher thermal conductivity than the plastic, in particular a thermal conductivity greater than 35 watts per meter and per Kelvin. This allows the core to cool down faster.
  • the shaft usually has a smooth surface in order to be able to connect the shaft to the drive device in a simple manner, in particular to be able to clamp it into it.
  • the shaft can have heat transfer means which are formed on the shaft in a shaft section arranged outside the core.
  • the heat conduction transfer means are preferably arranged between a clamping area of the shaft, which is designed at an axial end of the shaft facing away from the core and in particular has a smooth surface for connecting to the drive device, and the opposite axial end of the shaft overlapped by the core.
  • the heat transfer medium can in particular embossments, corrugations, Grooves, elevations, wings or the like, which increase the surface area of the shaft compared to a smooth surface, in order to give off thermal energy to the environment.
  • wing-like or turbine-like geometries are aligned on the shaft in such a way that ambient air is sucked in and the abrasion produced during the grinding process is blown away.
  • the abrasive does not overlap the heat transfer elements.
  • the heat transfer means can also serve as a clamping aid when connecting the abrasive carrier to the drive device.
  • the clamping area can have a smooth surface in a known manner, the user of the abrasive carrier being shown an optimal clamping depth of the shaft in the drive device through the start of the heat transfer means, for example the corrugation.
  • At least one radially protruding flange is arranged on the shaft, the flange being made of a material that has a higher thermal conductivity than the plastic, in particular a thermal conductivity greater than 35 watts per meter and per Kelvin.
  • the flange can absorb thermal energy and release it to the environment.
  • the flange can be made from the same material as the shaft or from a material that has a higher thermal conductivity than the shaft.
  • the flange can be designed to be annular or interrupted in the circumferential direction around the longitudinal axis. Furthermore, an outer side of the flange can be arranged in one plane with an end face of the core facing the shaft.
  • the flange can rest on the end face of the core or be flush with the end face of the core. This arrangement of the flange simplifies the manufacture of the abrasive carrier. In this case, the flange prevents the in particular liquid adhesion promoter, which can be applied to the axial end of the shaft before connecting the shaft to the core, from running into the remaining, coreless part of the shaft.
  • the core consists of 25 to 75 percent by weight, in particular 50 to 55 percent by weight of the filler and of 0 to 10 percent by weight of at least one functional additive, the remainder of the The core consists of the plastic and unavoidable impurities.
  • Polyurethane is particularly suitable as a plastic.
  • the foamed plastic can have closed pores.
  • the plastic can have a volume weight or density of 700 to 1250 kilograms per cubic meter.
  • the plastic can have a Shore A hardness of 30 to 90.
  • the Shore hardness A is standardized in accordance with DIN ISO 7619-1 and measures the indentation / penetration depth of a frustoconical steel pin in a test specimen on a scale from 0-100.
  • the core expediently has a plastic with a Shore hardness A of 30 to 90, in particular up to 80, preferably up to 70.
  • the core is therefore somewhat more flexible overall, so that when the grinding tool is applied, especially on hard edges of a metal workpiece, the risk of abrasive grains breaking out of the grinding layer is reduced.
  • an abrasive carrier with a flexible or elastic core which can adapt to the contour of the object to be processed or the part of the body to be treated, up to a firmer core, which is used, among other things, in podiatry is well usable, provided.
  • the material mixture of the core has at least one functional additive.
  • the at least one functional additive can be added to the plastic in powder form or in liquid form.
  • the at least one functional additive can have thermochromic color pigments and / or antibacterial agents and / or antifungal agents and / or agents that change the friction behavior.
  • Antibacterial and / or antifungal agents can be added to abrasive carriers that are intended for use on patients in order to provide an abrasive carrier that is as hygienic as possible.
  • the at least one functional additive can be, for example, silver, in particular colloidal silver or copper.
  • thermochromic color pigments can be added to the abrasive backing, which optically indicate that at least a defined temperature or a critical temperature range has been reached by at least one color change.
  • the user of the abrasive carrier can thus optically see that the abrasive and / or the abrasive carrier have / has become too warm, for example.
  • thermochromism is used, that is, certain substances change their color when heated.
  • thermochromic colorants or color pigments in the cool state Based on the color of the thermochromic colorants or color pigments in the cool state, for example at room temperature, a change in the color of the color pigments signals a temperature increase to the user. For example, initially dark color pigments could signal the rise in temperature by changing color to red.
  • the thermochromic color pigments give the user the opportunity to react to overheating, for example by reducing the contact pressure, by regulating the speed of the drive device or by interrupting the grinding process. Since the outer surface of the core cools again quickly through the use of the thermally conductive filler, reversible color pigments can expediently also be used to indicate the cooling of the abrasive backing.
  • irreversible color pigments are used in addition or as an alternative, the user can be shown permanently that the abrasive carrier was operated, for example, above a maximum permissible outer surface temperature, in that an irreversible color change is provided when the maximum permissible outer surface temperature is reached. In this way, even a single overheating of the abrasive backing is permanently displayed. Furthermore, irreversible color pigments can change their color as soon as they reach a predetermined external surface temperature just above room temperature, in order to permanently indicate after a short grinding process that the abrasive carrier has already been used once. The at least one color change is indicated to the user with sufficient clarity if the thermochromic color pigments make up up to 10 percent by weight of the material mixture.
  • the abrasive carrier has a coating that is applied to the surface of the core, the coating the thermochromic color pigments and / or antibacterial agents and / or antifungal agents.
  • the grinding tool according to the invention has the abrasive in addition to the abrasive carrier.
  • the abrasive is arranged interchangeably on the core.
  • the abrasive carrier can preferably be used for several grinding processes, whereas the abrasive can be a wear product.
  • the surface of the abrasive is designed to be closed in the circumferential direction around the longitudinal axis of the abrasive carrier and encloses a cavity extending along the longitudinal axis of the abrasive carrier.
  • the abrasive can have a cylindrical, conical, conical, spherical, partially cylindrical and hemispherical, or cap-shaped surface, with other geometric shapes also being possible.
  • the abrasive can, in particular, be a seamless abrasive cap that can be pushed onto the core of the abrasive backing.
  • the abrasive can be a grinding sleeve that only partially encloses the core.
  • an outer surface of the core is shaped at least partially complementary to the surface of the abrasive which surrounds the cavity.
  • the core can have a cylindrical, conical, conical, spherical, partially cylindrical and hemispherical, or cylindrical outer surface, with other geometric shapes also being possible. This means that the surface of the abrasive facing the core can lie flat against the core, so that the core connects the abrasive to the shaft. The abrasive adheres to the abrasive backing by friction between the outer surface of the core and the surface of the abrasive.
  • the abrasive which is held exchangeably on the core, can thus be changed in a simple manner by attaching it to the core or removing it from the core.
  • the abrasive is thus a separate component from the abrasive carrier, which is only held on the core by static friction.
  • the grinding tool can in principle be used with grinding means which are adapted to the respective application and which, for example, can be different in terms of their grinding properties or their strength.
  • the abrasive is preferably made of a flexible material such as abrasive cloth.
  • the abrasive cloth can have a preferably flexible carrier material, which is attached to a surface facing away from the core
  • the grinding side is coated with an abrasive material.
  • the outer surface can be a jacket surface that is closed in the circumferential direction about the longitudinal axis. That is, the jacket surface has a continuous surface without slots or the like. This also makes the core easier to clean.
  • the closed outer surface can be smooth, poreless or porous.
  • the core can consist of a closed-cell foam material, with good static friction values also being achieved with an open-cell foam material.
  • the maximum outside diameter of the core is preferably equal to or minimally smaller than the maximum inside diameter of the abrasive. As a result, the abrasive can on the one hand be easily attached and removed and on the other hand is held securely on the core during rotation.
  • the outer surface of the core can be a jacket surface interrupted in the circumferential direction around the longitudinal axis.
  • the interruptions can be slotted and can extend in a longitudinal direction defined by the shaft. If necessary, the interruptions can be cut into the core after it has been manufactured, or can be provided directly during manufacture, for example by casting or spraying an in particular lamellar surface.
  • the core can fan out and press itself against the surface of the abrasive from the inside.
  • a maximum outer diameter of the core can be greater than a maximum inner diameter of the abrasive in order to further increase the static friction between the outer surface of the core and the surface of the abrasive.
  • This provides a press fit between the core and the abrasive, which holds the abrasive securely on the abrasive carrier when the grinding tool is in operation.
  • the abrasive can have reversible and / or irreversible thermochromic colorants for determining an outer surface temperature of the abrasive.
  • the thermochromic color pigments are expediently arranged in the abrasive, especially when the abrasives are designed as abrasive caps that completely cover the core. Thanks to the use of the thermally conductive filler, the outer surface of the abrasive backing cools down quickly even after a short interruption, as the frictional heat is transported away into the core.
  • the abrasive using the example of a grinding cap, can be designed to be open at least on one side facing the shaft and, using the example of a grinding sleeve, on both axial sides. In this way, the thermal energy absorbed by the core can radiate laterally to the environment.
  • the grinding tool according to the invention can be used, for example, for metalworking and / or the treatment of parts of the human body, in particular in connection with a non-therapeutic or cosmetic treatment of a patient, for example for foot care, manicure or dental care.
  • Figure 1 shows an embodiment of an abrasive carrier 1.
  • the abrasive carrier 1 comprises a metal shaft 2 and a core 3 made of a material mixture which has a plastic with a thermally conductive filler and, here, further functional additives.
  • the shaft 2 has an elongated, pin-like basic shape with a front axial end 4 and a rear axial end 5 and defines a longitudinal axis X.
  • the rear end 5 of the shaft 2 is used to connect the abrasive carrier 1 to a drive device (not shown) for rotating the Abrasive carrier 1 around the longitudinal axis X.
  • the shaft 2 can be clamped, for example, in a chuck of the drive device.
  • the shaft 2 has a roughened, in particular corrugated surface along the front end 4 covered by the core 5.
  • a radially protruding, here annularly closed flange 6 is arranged on the shaft 2.
  • the flange 6 is also metallic, and here, like the shaft 2, made of steel, for example.
  • An outer side 7 of the flange 6 facing the rear end 5 of the shaft 2 is in a plane E with an end face 8 of the core 3 facing the shaft 2, that is, the flange 6 is flush with the core 3.
  • the shaft 2 has heat transfer means 10 in a shaft section 9 of the shaft 2 arranged outside the core 3.
  • the heat transfer means 10 are, here, embossings which enlarge the surface or the radiating surface of the shaft 2 in the shaft section 9.
  • the rear end 5 of the shaft 2 has a smooth surface. Starting from the rear end 5, the beginning of the embossing 10, as a clamping mark 11, shows the user the optimal clamping depth in the drive device.
  • the core 3 is designed to be rotationally symmetrical to the longitudinal axis X and has a solid body which, here only as an example, has a cylindrical section and a hemispherical section. Alternative geometries are also possible.
  • the material mixture of the core 3 is, here, foamed polyurethane, which is cured with closed pores.
  • the foam is made up of gaseous bubbles enclosed by solid walls.
  • the plastic can be provided with different properties.
  • the plastic can have a density of 700 to 1250 kilograms per cubic meter.
  • the plastic can have a Shore A hardness of 30 to 90.
  • the thermally conductive filler is also provided, which is added to the plastic and distributed as homogeneously as possible in the core 3.
  • the filler is in the together with the other functional additives Figure 1 indicated by the points shown in the core 3 which, for the sake of clarity, are only provided once with the reference number 12.
  • the filler can be inorganic, in particular metallic or mineral.
  • the filler can be silver, copper or silicon carbide.
  • the filler can also comprise carbon nanotubes.
  • Such fillers have a coefficient of thermal conductivity ⁇ greater than 35 W / mK .
  • the fillers have a significantly higher thermal conductivity than the plastic, which, using the example of foamed polyurethane, has a coefficient of thermal conductivity ⁇ of around 0.04 W / mK .
  • the shaft 2 and the flange 6 are also made of a material, here steel, which, with a coefficient of thermal conductivity ⁇ of greater than 35 W / mK, has a significantly higher thermal conductivity than the plastic.
  • the material mixture of the core 3 has the functional additives.
  • the additives used here include, on the one hand, thermochromic color pigments, which signal to the user that a defined temperature or a critical temperature range has been reached by changing colors.
  • thermochromic color pigments which signal to the user that a defined temperature or a critical temperature range has been reached by changing colors.
  • the use of the thermochromic color pigments in the core 3 of the abrasive carrier 1 is particularly useful when abrasives are used which only cover the core 3 in sections. This can be, for example, a cylindrical grinding sleeve which is arranged on the cylindrical section of the core 3.
  • the functional additives can influence the frictional behavior of an outer surface 13 of the core 3. In this way, the coefficient of static friction can be increased. Furthermore, here, antibacterial and antifungal additives, in particular silver or colloidal silver, are provided.
  • the core 3 thus consists, here, of 25 to 75 percent by weight of the filler and 0.5 to 10 percent by weight of the functional additives, the remainder of the core 3 being made of plastic, with marginal impurities cannot be excluded.
  • a coating 14 is applied which, here, has antibacterial and antifungal agents in order to be able to provide a starting product that is as hygienic as possible for the treatment of patients.
  • the coating 14 could also have thermochromic color pigments.
  • FIG 2 a grinding tool according to the invention is shown, which in addition to that in the Figure 1
  • the abrasive carrier 1 shown shows a replaceable abrasive 15 pushed onto the core 3.
  • the grinding means 15 has a surface 16 which is closed in the circumferential direction about the longitudinal axis X and which encloses a cavity 17 extending along the longitudinal axis X.
  • the abrasive 15 is, here, shown in the form of a seamless abrasive cap.
  • In the cavity 17 is the core 3 of the, in connection with the Figure 1 already described, abrasive carrier 1 added.
  • the outer surface 13 is shaped complementary to the surface 16 and designed as a jacket surface that is closed around the longitudinal axis X in the circumferential direction.
  • the surface 16 of the abrasive 15 lies flat on the outer surface 13 of the core 3, so that the exchangeable abrasive 15 is only held on the core 3 by the static friction force.
  • a grinding layer 18 On a side of the abrasive 15 facing away from the core 3 is a grinding layer 18 arranged, which has abrasive grains bound in a binder, in particular resin.
  • the grinding layer 18 contains thermochromic color pigments for determining an outer surface temperature of the grinding means 15, in particular of the grinding layer 18.
  • the grinding tool When the grinding tool is in operation, it is driven to rotate about the longitudinal axis X by the drive device. During a grinding process, the friction between the grinding means 15 and the object to be processed creates frictional heat, which is distributed into the core 3 by the thermally conductive fillers.
  • the core 3 can dissipate the absorbed thermal energy via the end face 8 of the core 3 that is not covered by the grinding means 15.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (15)

  1. Outil abrasif, comprenant
    un porte-moyen abrasif (1), qui comporte une tige (2), destinée à relier le porte-moyen abrasif (1) avec un dispositif d'entraînement pour l'entraînement en rotation du porte-moyen abrasif (1) autour d'un axe longitudinal (X), et un noyau (3), qui est relié avec une extrémité (4) axiale de la tige (2),
    le noyau (3) étant constitué d'un mélange de matières, qui comporte une matière plastique dotée d'un agent de charge conducteur thermique, l'agent de charge faisant preuve d'une conductibilité thermique supérieure à 35 watts par mètre et par Kelvin, et
    un moyen abrasif (15),
    caractérisé en ce que
    le moyen abrasif (15) comporte une surface (16), fermée en direction périphérique, autour de l'axe longitudinal (X) qui entoure une cavité (17) s'étendant le long de l'axe longitudinal (X),
    le noyau (3) étant réceptionné au moins en partie dans la cavité (17), et
    en ce que la matière plastique est conçue en étant moussée.
  2. Outil abrasif selon la revendication 1, caractérisé en ce que le moyen abrasif (15) est placé de manière interchangeable sur le noyau (3), le moyen abrasif (15) adhérant au porte-moyen abrasif (1) par friction entre une surface extérieure (13) du noyau (3) et la surface (16) du moyen abrasif (15).
  3. Outil abrasif selon la revendication 1 ou 2, caractérisé en ce que le moyen abrasif (15) comporte une matière de support souple, qui sur une face abrasive opposée au noyau (3) est revêtue d'une matière abrasive.
  4. Outil abrasif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le moyen abrasif (15) est un capuchon abrasif ou un manchon abrasif, le manchon abrasif n'entourant le noyau qu'en partie.
  5. Outil abrasif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le volume de la matière plastique moussée s'élève à de 70 % à 95 % du volume total du noyau (3), le volume de l'agent de charge et le volume d'au moins un adjuvant fonctionnel optionnel s'élevant conjointement à un maximum de 30 % du volume total du noyau (3).
  6. Outil abrasif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le noyau (3) est constitué à raison de 25 à 75 pour cent en poids de l'agent de charge et à raison de 0 à 10 pour cent en poids d'au moins un ou de l'adjuvant fonctionnel, le reste du noyau (3) étant constitué de la matière plastique et d'impuretés inévitables.
  7. Outil abrasif selon la revendication 6, caractérisé en ce que l'au moins un adjuvant fonctionnel est sélectionné dans le groupe contenant les pigments colorés thermochromiques, les produits à effet antibactérien, les produits à effet antifongique, les produits modifiant le comportement de friction.
  8. Outil abrasif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la matière plastique a un poids spécifique de 700 à 1250 kilogrammes par mètre cube et/ou une dureté Shore de 30 à 90.
  9. Outil abrasif selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la matière plastique est sélectionnée dans le groupe contenant le polyuréthane, les polymères élastiques, le silicone, le caoutchouc de fabrication synthétique, le caoutchouc naturel.
  10. Outil abrasif selon l'une quelconque des revendications 1 à 9, caractérisé en ce que la tige (2) est fabriquée en une matière qui fait preuve d'une conductibilité thermique supérieure à 35 watts par mètre et par Kelvin.
  11. Outil abrasif selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la tige (2) comporte des moyens de transfert thermique (10), qui sont conçus sur la tige (2) dans un tronçon de tige (9) placé à l'extérieur du noyau (3).
  12. Outil abrasif selon l'une quelconque des revendications 1 à 11, caractérisé en ce que sur la tige (2) est placée au moins une bride (6) débordant en direction radiale, la bride (6) étant fabriquée en une matière qui fait preuve d'une conductibilité thermique supérieure à 35 watts par mètre et par Kelvin.
  13. Outil abrasif selon l'une quelconque des revendications 1 à 12, caractérisé en ce que le porte-moyen abrasif (1) comporte un revêtement (14) qui est appliqué sur la surface extérieure (13) du noyau (3), le revêtement (14) comportant des pigments colorés thermochromiques et/ou des produits à effet antibactérien et/ou un produit à effet antifongique.
  14. Outil abrasif selon l'une quelconque des revendications 1 à 13, caractérisé en ce que le moyen abrasif (15) comprend des produits colorants thermochromiques, destinés à déterminer une température de surface extérieure d'une couche abrasive (18) du moyen abrasif (15).
  15. Utilisation d'un outil abrasif selon l'une quelconque des revendications 1 à 14 pour traiter des endroits d'un corps humain.
EP18742484.1A 2017-07-25 2018-07-17 Outil abrasif et utilisation dudit outil abrasif Active EP3657976B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18742484T PL3657976T3 (pl) 2017-07-25 2018-07-17 Narzędzie ścierne i zastosowanie takiego narzędzia ściernego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017116851.6A DE102017116851B4 (de) 2017-07-25 2017-07-25 Schleifwerkzeug und Verwendung eines solchen Schleifwerkzeuges
PCT/EP2018/069406 WO2019020438A1 (fr) 2017-07-25 2018-07-17 Outil abrasif et utilisation dudit outil abrasif

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EP3657976A1 EP3657976A1 (fr) 2020-06-03
EP3657976B1 true EP3657976B1 (fr) 2021-09-08

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US (1) US11850706B2 (fr)
EP (1) EP3657976B1 (fr)
CN (1) CN111093422A (fr)
CA (1) CA3068783C (fr)
CL (1) CL2020000205A1 (fr)
DE (1) DE102017116851B4 (fr)
DK (1) DK3657976T3 (fr)
ES (1) ES2898248T3 (fr)
HU (1) HUE057071T2 (fr)
PL (1) PL3657976T3 (fr)
RU (1) RU2738757C1 (fr)
WO (1) WO2019020438A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115106948B (zh) * 2022-07-14 2024-03-15 苏州市九研超硬材料有限公司 温敏控温砂轮

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3283448A (en) 1964-08-14 1966-11-08 Bay State Abrasive Products Co Organic bonded abrasive article
GB1279413A (en) 1968-10-11 1972-06-28 Impregnated Diamond Prod Ltd Improvements in abrasive wheels and other abrasive tools
DE1950880B2 (de) * 1968-10-11 1979-02-15 Impregnated Diamond Products Ltd., Gloucestershire (Grossbritannien) Diamantschleifwerkzeug
US3868233A (en) * 1973-03-12 1975-02-25 Norton Co Grinding wheel core
US4389192A (en) * 1979-08-20 1983-06-21 Neuwirth Siegmund A Dental reducing tool
JPS5917572Y2 (ja) 1980-06-13 1984-05-22 豊田工機株式会社 研削用砥石
DE4006660A1 (de) 1990-03-03 1991-09-05 Winter & Sohn Ernst Schleifscheibe zum schleifen von brillenglasraendern
TW221967B (fr) * 1991-08-30 1994-04-01 Minnesota Mining & Mfg
CN2297280Y (zh) * 1997-05-02 1998-11-18 张建民 柔性打磨器
JP3308246B2 (ja) * 1999-08-18 2002-07-29 株式会社リード 希土類磁石切断用ダイヤモンドブレードの芯金
WO2003099496A2 (fr) * 2002-05-28 2003-12-04 Homma Michael M Outil de polissage rotatif en mousse et son procede de fabrication
WO2006121080A1 (fr) * 2005-05-11 2006-11-16 Kabushiki Kaisha Shofu Abrasif dentaire contenant des particules de resine spheriques
US7493670B1 (en) 2005-08-16 2009-02-24 Brogan Daniel L Buffing and polishing tool
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WO2019020438A1 (fr) 2019-01-31
US11850706B2 (en) 2023-12-26
RU2738757C1 (ru) 2020-12-16
CN111093422A (zh) 2020-05-01
DE102017116851A1 (de) 2019-01-31
PL3657976T3 (pl) 2022-02-07
CA3068783C (fr) 2022-05-03
DE102017116851B4 (de) 2020-06-04
CL2020000205A1 (es) 2020-10-02
HUE057071T2 (hu) 2022-04-28
EP3657976A1 (fr) 2020-06-03
ES2898248T3 (es) 2022-03-04
CA3068783A1 (fr) 2019-01-31
US20200238476A1 (en) 2020-07-30
DK3657976T3 (da) 2021-12-06

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