WO2022022906A1 - Procédé de production d'un article abrasif structuré, et article abrasif - Google Patents

Procédé de production d'un article abrasif structuré, et article abrasif Download PDF

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Publication number
WO2022022906A1
WO2022022906A1 PCT/EP2021/067352 EP2021067352W WO2022022906A1 WO 2022022906 A1 WO2022022906 A1 WO 2022022906A1 EP 2021067352 W EP2021067352 W EP 2021067352W WO 2022022906 A1 WO2022022906 A1 WO 2022022906A1
Authority
WO
WIPO (PCT)
Prior art keywords
abrasive article
abrasive
binder
areas
article
Prior art date
Application number
PCT/EP2021/067352
Other languages
German (de)
English (en)
Inventor
Johannes Huber
Ruben Drost
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP21736293.8A priority Critical patent/EP4188644A1/fr
Publication of WO2022022906A1 publication Critical patent/WO2022022906A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B24D11/001—Manufacture of flexible abrasive materials
    • 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
    • B24D18/0072—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing
    • 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
    • B24D3/007—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 bonding agent between different parts of an abrasive tool
    • 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
    • B24D3/02—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 bonding agent
    • B24D3/20—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 bonding agent and being essentially organic
    • B24D3/22—Rubbers synthetic or natural
    • 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
    • B24D3/02—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 bonding agent
    • B24D3/20—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 bonding agent and being essentially organic
    • B24D3/28—Resins or natural or synthetic macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D2203/00—Tool surfaces formed with a pattern

Definitions

  • the invention relates to a method of making an abrasive article having structured abrasive areas.
  • the invention also relates to a corresponding abrasive article.
  • abrasive articles having structured abrasive areas are already known.
  • a binder is already applied to an abrasive article backing in a structured manner in such a way that it defines structured grinding areas. If abrasive grains are then scattered all over the abrasive article backing, the abrasive grains will only adhere to those places on the abrasive article backing that were previously coated with binder.
  • Stamps, stamp rollers or roll-to-roll processes such as relief printing or gravure printing processes are used in particular for the structured application of the binder.
  • Another known method for structuring grinding areas is the use of abrasive article backings already structured with elevations and/or depressions.
  • the abrasive article backing is coated with binder at the elevations using a roller. Disclosure of Invention
  • a method of making an abrasive article having structured abrasive areas comprises the steps of providing an abrasive article backing, coating the abrasive article backing with a binder, in particular a base binder, locally resolved activation or deactivation of the binder and sprinkling the abrasive article backing with abrasive grains.
  • an “abrasive article” is used for grinding or abrasive processing of a workpiece, during which material from the workpiece is mechanically removed from the surface of the workpiece in the form of chips.
  • the abrasive article is a coated abrasive article or a composite abrasive article comprising foam and a facestock or a foam abrasive article.
  • alternative abrasive articles are also conceivable, such as bonded abrasive articles, which are typically synthetic resin-bonded cutting and grinding wheels.
  • the abrasive article is implemented as sandpaper.
  • the abrasive article comprises an abrasive article backing, in particular a flexible one, with at least one layer.
  • the abrasive article backing which is particularly flexible, gives the abrasive article specific properties in terms of adhesion, elongation, tear and tensile strength, flexibility and stability.
  • the backing for the abrasive article can comprise, in particular, paper, cardboard, vulcanized fiber, foam, a plastic, a textile structure, in particular a woven fabric, knitted fabric, knitted fabric, netting, fleece, or a combination of these materials, in particular paper and fabric, in one or more layers .
  • “Structured grinding areas” are areas on the surface of the abrasive article that are provided with abrasive grains, whereby these areas differ from a full-surface design - as is usually realized in the prior art - and are “structured” in this sense.
  • a structured abrasive area is therefore distinct from an abrasive grain-free area on the surface of the abrasive article (ignoring apertures, as these are not part of the surface of the abrasive article).
  • they can structured grinding areas that can be generated in a controlled (and in particular also reproducible) manner - in particular in conjunction with the areas not provided with abrasive grain (omitted or free of abrasive grain) - can be regarded as a controlled (and in particular also reproducible) pattern on the surface of an abrasive article.
  • the areas of the abrasive article that are not provided with abrasive grains have no abrasive effect when the abrasive article is used during a grinding operation.
  • a continuously changing pattern of textured abrasive areas is applied to the abrasive article.
  • a pattern of structured areas applied to abrasive articles is always uniform, since changing the pattern requires an exchange of an applicator roller, a die or a stamp and the respective template for each pattern has to be produced separately. Consequently, these known methods of the prior art also do not allow continuously changing patterns of the structured areas.
  • the proposed invention makes it possible to produce continuously changing patterns of the sanding areas without making templates or negatives for the pattern—similar to a conventional printer, as is known from the office.
  • abrasive article backing can in particular be images such as manufacturer logos or the like.
  • the patterns can specifically implement abrasive grain-free areas that serve to advantageously remove abrasive dust generated during a grinding operation.
  • the abrasive article can also be structured so that the abrasive article can be easily folded in areas that are free of abrasive grain.
  • the structured abrasive areas encode information, in particular information relating to the abrasive article.
  • information can be, for example, the manufacturer (e.g. in the form of a logo, a name), a grit of the abrasive article, a material of the abrasive article, a serial number of the abrasive article or the like. meeting.
  • the encoded information can also be applied to different areas of the abrasive article backing in a continuously altered manner by the method according to the invention.
  • running meters of the web of abrasive articles can be provided with a running indication of the meter.
  • the abrasive article backing is coated with a binder.
  • abrasive grits are basically fixed to the abrasive article backing by means of a bonding agent (often referred to as a make coat).
  • the binder With the binder, the abrasive grains are at least prefixed, in particular fixed, in a desired position and/or distribution on the abrasive substrate.
  • the binder may be applied to the surface of the abrasive article backing by means of a knife, roller, imprint, brush, or the like.
  • the binder is a hardening plastic, in particular a non-crosslinked thermoplastic, for example a thermoplastic polyurethane, or a free-radically crosslinkable resin.
  • a hardening plastic in particular a non-crosslinked thermoplastic, for example a thermoplastic polyurethane, or a free-radically crosslinkable resin.
  • the binder has a viscosity greater than 10,000 mPa.s, in particular greater than 40,000 mPa.s, very particularly greater than 70,000 mPa.s at 100.degree. Binders with a high viscosity can be used with the proposed method. This effectively prevents abrasive grains from tipping over during a scattering process. It is also possible to combine the method according to the invention with an electrostatic scattering method for applying the abrasive grains to the coated abrasive article backing in order to achieve an orientation of the abrasive grains which is predominantly orthogonal to the web of abrasive article goods.
  • Activating the binder means that the binder applied to the abrasive backing - typically a more or less solid, non-wetting and therefore not particularly sticky layer - is modified in such a way that it has its wetting or sticky properties, ie an adhesive effect unfolds. Consequently, in this embodiment, the binder initially has no (particularly) adhesive properties when coated onto the abrasive article backing.
  • a property that binds the abrasive grains is first created, by means of which the abrasive grains can be fixed mechanically.
  • deactivating the binder is meant that the binder applied to the abrasive article backing is modified in such a way that it substantially loses its binding or adhesive properties, i.e., an adhesive effect. Consequently, in this embodiment, the binder initially exhibits adhesive and possibly wetting properties when the abrasive article backing is coated. With the deactivation of the binder, the binder is modified in such a way that it cannot bind abrasive grains and thus fix them on the abrasive article support. As a result, the binder cannot form a mechanical bond with the abrasive grains. “Essentially” loses means that the deactivated binder can still retain slightly adhesive properties (comparable to a post-it), which, however, only cause a temporary, not particularly stable adhesion of dust (or abrasive grains). be able.
  • the process steps of activating or deactivating the binder and sprinkling with abrasive grains can in principle be carried out in any order. However, sprinkling is preferably carried out after activation or deactivation.
  • "Spatially resolved" means that the binder applied to the backing of the abrasive article - for example over the entire surface - can be activated or deactivated in any way at different points, with correspondingly binding (adhesive) or non-binding (non-adhesive) areas on the coated Abrasive article pad are generated.
  • the structured grinding areas according to the invention can be realized in this way.
  • the spatial resolution therefore relates to an at least two-dimensional position on the abrasive article backing.
  • the binder is activated in a locally resolved manner by irradiation with light, in particular with laser light or UV light.
  • light in particular with laser light or UV light.
  • it can be a binder based on polyethylene, polystyrene, polypropylene, ethylene-vinyl acetate copolymer or the like.
  • UV light activation can take place, for example, by spatially resolved exposure of the applied binder if the binder is selected as a UV light-curable binder, for example a free-radically crosslinkable resin. It should be mentioned that activation can be achieved in principle by chemically activating and/or by heating, in particular by melting or softening, the binder.
  • the activation is carried out immediately after the coating step, so that residual heat of the abrasive article, in particular of the binder coated thereon, is utilized.
  • the energy input required to activate the binding agent i.e. to be irradiated
  • the energy input required to activate the binding agent can be lower, so that energy is saved.
  • the binder is irradiated with light, in particular with laser light or UV Light, spatially resolved deactivated.
  • a plastic that hardens at an elevated temperature can be specifically and locally illuminated, for example using laser light, and thus heated and hardened so that its binding properties are destroyed and it can no longer be used as a binding agent.
  • the binder can also be thermally destroyed and deactivated in this way.
  • UV light deactivation can take place, for example, by spatially resolved exposure of the applied binder if the binder is selected as a binder that can be cured by UV light, for example a free-radically crosslinkable resin.
  • the binder is already hardened at the points where UV light is emitted for deactivation, so that it loses its sticky properties. In principle, deactivation can be achieved by burning away, ie destroying, or by curing the binder.
  • Activation or deactivation by means of light is a particularly efficient way of activating or deactivating the binder in a highly spatially resolved manner.
  • a spatially resolved exposure of the binder by means of directed light can be implemented, for example, using an x-y laser scanner, as is known, for example, from applications such as laser printing, lidar, etc.
  • a DLP chip (known from applications such as light projectors) or a shading mask can be used to achieve spatially resolved light irradiation.
  • a solid body laser or a CO2 laser or the use of infrared laser diodes is suitable as a laser.
  • the abrasive article is also finished by irradiating the light and/or a hole pattern is produced in the abrasive article.
  • the components required to produce the abrasive article in particular a light source for activating or deactivating and for assembling or perforating the abrasive article, can be reduced.
  • No additional equipment is required to shape the abrasive article into its target shape, such as a grinding wheel containing holes.
  • the binder is locally activated with the application of a liquid agent, in particular a coolant or a reactant.
  • a liquid agent in particular a coolant or a reactant.
  • a binder based on polyol can be printed with an isocyanate solution and thus crosslinked and develop a tacky property on the printed areas. The areas not activated with isocyanate, on the other hand, do not develop any sticky properties. If the abrasive article base prepared in this way is then sprinkled with abrasive grains, these only adhere to the areas of the abrasive article base previously activated with the liquid agent, which consequently represent the structured abrasive areas.
  • the binder is deactivated locally by applying a liquid agent, in particular a coolant or a reactant.
  • a liquid agent in particular a coolant or a reactant.
  • An embodiment of this embodiment may be provided, for example, by cooling a thermally activated binder (e.g., thermoplastic polyurethane) applied to the abrasive article backing as a result of application of a cooling liquid.
  • a thermally activated binder e.g., thermoplastic polyurethane
  • the liquid agent comprises water and/or a wetting agent and/or an anti-adhesive agent, in particular stearate, and/or a solvent, in particular glycol, and/or a polymer that hardens rapidly when heated.
  • a wetting agent and/or an anti-stick agent are advantageously suitable since these substances are often subsequently applied to the abrasive article in order to achieve further advantageous effects.
  • a heat-curing polymer can be specified, for example, in the form of a dissolved adhesive such as epoxy resin, the adhesive drying and thereby hardening as a result of evaporation of the solvent.
  • the liquid agent is applied in an inkjet printing process or in a locally resolved manner by means of at least one directional spray nozzle.
  • any ink jet printing process that is compatible with the liquid used, for example water, is suitable for this.
  • a so-called “long-distance inkjet printing process” is also conceivable in which over a comparatively large distance of a few centimeters, the liquid agent can be printed.
  • Any pattern or image of the liquid agent, such as water, can be printed onto the make coated abrasive article backing using an ink jet printing process.
  • a foam block as a backing for abrasive articles with a hot-melt binder, with any pattern (or image) then being “printed” with water on the foam block using an inkjet printing process.
  • the water evaporates on the still hot hotmelt binder surface (e.g. at 220 °C), with the hotmelt binder cooling below the melting point at the printed areas and allowing it to solidify locally.
  • Abrasive grains can then be sprinkled on, with abrasive grains adhering to the areas that are still melted, while they do not adhere to the areas of the foam block surface that have been previously imprinted with water and are thus already solidified.
  • the abrasive grain still adhering to the non-adhesive areas due to surface effects is then removed again by blowing away.
  • the surface structured with grinding areas remains on the backing of the abrasive article.
  • the method is implemented as a roll-to-roll method, the activation or deactivation step being carried out after, in particular immediately after, the coating step.
  • the method according to the invention can be integrated into an existing process chain of the manufacturing process and a corresponding process landscape, for example into an existing production plant, without the need for additional, particularly complex machines or restructuring in the process chain and/or process landscape. “Immediately after” is to be understood as meaning that no further process or processing steps are carried out between the coating step and the activation or deactivation step.
  • the abrasive grains are scattered onto the abrasive backing by means of electrostatic scattering.
  • the abrasive grains adhere to the activated or non-deactivated areas, with the inventive according to structured grinding areas are formed.
  • the abrasive grains not bonded to the base of the abrasive article by means of a binder are removed mechanically after the binder has been spread and cured, for example by brushing off, shaking off, blowing away or sucking away. In this way, excess abrasive grain can be recycled, which is particularly advantageous in the case of expensive abrasive grains such as diamond, ceramic or tungsten carbide.
  • top binder in addition to the binder as a base binder, another so-called top binder can be used, which is applied in particular in layers over the abrasive grains fixed to the abrasive backing by means of the base binder.
  • the top binder connects the abrasive grains firmly to each other and to the abrasive backing.
  • the person skilled in the art is in principle familiar with suitable top coats from the prior art.
  • the abrasive article can be further processed conventionally after the scattering process, for example by applying stearate, making it up or the like.
  • the invention also relates to an abrasive article made by the method of the invention.
  • FIG. 1 shows a schematic sectional representation of an abrasive article according to the invention with abrasive grains
  • FIG. 2 is a plan view of one embodiment of an abrasive article of the present invention
  • FIG. 3 shows a process diagram to illustrate the process according to the invention
  • FIG. 4 shows an exemplary production setup for carrying out the method according to the invention.
  • FIG. 1 shows a section of an exemplary embodiment of an abrasive article 10 according to the invention with abrasive grains 12 in a schematic sectional view.
  • the abrasive article 10 in the illustrated embodiment is a coated abrasive article 10 having an abrasive article backing 14 made of paper.
  • the abrasive article backing 14 made of paper serves as a flexible substrate for the abrasive grains 12.
  • the abrasive grains 12 are attached to the abrasive article backing 14 by means of a binding agent 16, in particular a base binder 18, which is implemented here as thermoplastic polyurethane (TPU), for example.
  • TPU thermoplastic polyurethane
  • the layer of base binder 18 and abrasive grains 12 is additionally coated with a top binder 20, in particular made of phenolic resin.
  • Abrasive article 10 includes structured abrasive areas 22 separated by areas 24 that do not include abrasive grains.
  • FIG. 2 shows a plan view of an abrasive article 10 according to the invention, as it was produced using the method according to the invention (cf. FIG. 3) for producing an abrasive article 10 with structured abrasive areas 22 .
  • the structured abrasive areas 22 reproduce—in combination with the abrasive grain-free areas 24—a pattern 26 or image.
  • the structured abrasive areas 22 in combination with the abrasive grain-free areas 24 also encode information about the abrasive article 10, represented as the company logo (above “Sia Abrasives”) and the grit (below “80”) of the abrasive article 10. In this sense encode the structured grinding areas 22 - or similarly the abrasive grain-free areas 24 - information about the abrasive article 10.
  • FIG. 3 shows a process diagram showing an exemplary embodiment of the process 100 according to the invention for producing an abrasive article 10 with structured abrasive areas 22 .
  • Figure 4 shows a matching manufacturing structure 30.
  • a first step 102 is a Abrasive article pad 14 is provided.
  • this is achieved by unwinding and threading a web of paper goods 32 into the production structure 30 so that the web of paper goods 32 runs over the deflection rollers 40 .
  • the grinding article base 14 is coated with a binder 16, selected here as a thermoplastic polyurethane binder.
  • the binder 16 is applied to the web of paper goods 32 as the abrasive article backing 14 by means of a doctor blade 34 .
  • the previously applied binding agent 16 is chemically activated immediately thereafter in a locally resolved manner, here by irradiation with light 36.
  • the light 36 is generated as laser light by a laser 38.
  • the abrasive article 10 is also finished using the light 36—here laser radiation—by irradiation with the light 36 (ie cut into circular discs as shown in FIG.
  • the cut-out abrasive article 10 initially remains in the paper web 32 (for example, the abrasive article 10 was not cut out all around, but rather a few thin backing webs holding the abrasive article 10 remained).
  • abrasive article backing 14 is electrostatically sprinkled with abrasive grains 12 (by generating an electric field between two electrodes 42) and cured (not shown in detail here).
  • a binding agent 16 instead of activating a binding agent 16 with light 36, it is alternatively conceivable to locally deactivate an already liquid and adhesive binding agent 16 by applying a liquid agent, for example water. It is conceivable to replace the laser 38 in FIG. 4 with an inkjet print head (not shown separately here), by means of which the liquid medium—in this case water—is applied to the abrasive article base 14 coated with the binder 16 in an inkjet printing process.
  • a liquid agent for example water.

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

Abstract

L'invention concerne un procédé de fabrication d'un article abrasif présentant des régions abrasives (22) structurées. Selon l'invention, le procédé comprend les étapes de procédé consistant à fournir une sous-couche d'article abrasif (14), revêtir la sous-couche d'article abrasif (14) avec un liant (16), activer ou désactiver le liant (16) de manière spatialement résolue et diffuser des grains abrasifs (12) sur la sous-couche d'article abrasif (14). L'invention concerne également un article abrasif (10) produit de manière correspondante.
PCT/EP2021/067352 2020-07-29 2021-06-24 Procédé de production d'un article abrasif structuré, et article abrasif WO2022022906A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21736293.8A EP4188644A1 (fr) 2020-07-29 2021-06-24 Procédé de production d'un article abrasif structuré, et article abrasif

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020209521.3 2020-07-29
DE102020209521.3A DE102020209521A1 (de) 2020-07-29 2020-07-29 Verfahren zur Herstellung eines strukturierten Schleifartikels sowie Schleifartikel

Publications (1)

Publication Number Publication Date
WO2022022906A1 true WO2022022906A1 (fr) 2022-02-03

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ID=76708224

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Application Number Title Priority Date Filing Date
PCT/EP2021/067352 WO2022022906A1 (fr) 2020-07-29 2021-06-24 Procédé de production d'un article abrasif structuré, et article abrasif

Country Status (3)

Country Link
EP (1) EP4188644A1 (fr)
DE (1) DE102020209521A1 (fr)
WO (1) WO2022022906A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080098659A1 (en) * 2006-10-26 2008-05-01 Chien-Min Sung Methods for securing individual abrasive particles to a substrate in a predetermined pattern
EP2390056A2 (fr) * 2010-05-28 2011-11-30 Oy Kwh Mirka Ab Produit abrasif et son procédé de revêtement
CN106272126A (zh) * 2016-08-29 2017-01-04 华侨大学 一种基于光固化制作磨料图案排布钎焊磨轮的方法
JP2018512190A (ja) * 2015-02-27 2018-05-17 スリーエム イノベイティブ プロパティズ カンパニー スクラブ物品、及びその作製方法
US20200101657A1 (en) * 2014-10-17 2020-04-02 Applied Materials, Inc. Polishing articles and integrated system and methods for manufacturing chemical mechanical polishing articles
DE102018220672A1 (de) * 2018-11-30 2020-06-04 Robert Bosch Gmbh Verfahren zur Behandlung eines Schleifartikels sowie Schleifartikel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5014468A (en) 1989-05-05 1991-05-14 Norton Company Patterned coated abrasive for fine surface finishing
US6287184B1 (en) 1999-10-01 2001-09-11 3M Innovative Properties Company Marked abrasive article

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080098659A1 (en) * 2006-10-26 2008-05-01 Chien-Min Sung Methods for securing individual abrasive particles to a substrate in a predetermined pattern
EP2390056A2 (fr) * 2010-05-28 2011-11-30 Oy Kwh Mirka Ab Produit abrasif et son procédé de revêtement
US20200101657A1 (en) * 2014-10-17 2020-04-02 Applied Materials, Inc. Polishing articles and integrated system and methods for manufacturing chemical mechanical polishing articles
JP2018512190A (ja) * 2015-02-27 2018-05-17 スリーエム イノベイティブ プロパティズ カンパニー スクラブ物品、及びその作製方法
CN106272126A (zh) * 2016-08-29 2017-01-04 华侨大学 一种基于光固化制作磨料图案排布钎焊磨轮的方法
DE102018220672A1 (de) * 2018-11-30 2020-06-04 Robert Bosch Gmbh Verfahren zur Behandlung eines Schleifartikels sowie Schleifartikel

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DE102020209521A1 (de) 2022-02-03

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