Classifications

• • 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

Definitions

• Glass especially flat glass, has sharp edges after cutting. Depending on the application, this can be accepted or the edges are sanded and / or polished. Especially with edges that are visible or need to be particularly smooth due to technical reasons, the polishing step is required. Examples include visible glass edges, such as glass table tops, or edges that must have certain optical properties. Further processing may require polishing.
• the edges are machined using glass edge grinding machines.
• Such machines include, for example, single and double sided glass edge polishing machines and hand machines.
• the edges are also the seam or facets of a glass edge to understand.
• grinding pots which rotate.
• cup wheels are cylinder jacket-shaped and their working surface is disc-shaped arranged on the top of the pot.
• polishing pots contain corundum or silicon carbide abrasive in a polymeric compound containing the abrasive grains, referred to as elastic bonding.
• elastic bonds inter alia, polychloroprene rubber and polyurethane resins are used.
• a polymeric composition containing the abrasive grains is also referred to as elastic bonding and typically has a modulus of elasticity of less than 20 kN / mm 2 .
• an elastic bond is to be distinguished from a bond no longer regarded as an elastic bond only in the alternative by the size elastic modulus. The skilled person knows when an elastic bond is present and when not.
• machining with polishing pots is followed by machining with one or more diamond cup wheels. These are mostly polishing pots with corundum in grain sizes (d50) from 1 ⁇ m to 600 ⁇ m. When a high grade of polish is required, processing with a ceria polishing pot usually follows.
• the optical quality of the polished surface can i.a. can be easily checked by observing and comparing the mirror image of a glowing filament of a clear light bulb. The clearer the reflection of this filament appears, the higher the optical quality of the polished surface. For low grade surfaces, the filament appears cloudy or out of focus, while for surfaces of high optical quality, the filament appears clearly outlined.
• grinding and polishing tools which differ essentially only by their connecting element for attachment to the grinding machine and its geometry.
• grinding pins and so-called peripheral disks whose grinding surface is their cylindrical surface, which is similar to the running surface of a wheel.
• Polychloroprene rubber cups can be produced by first producing a premix in an internal mixer. Additives such as reinforcing resin, magnesium and / or zinc oxide and possibly stearic acid are added right at the beginning with the polychloroprene rubber and kneaded for 5 minutes. Then, on a mixing roll with two counter-rotating rolls with a gap of 1 to 5 mm, the so-called rubber skin is formed. This is the material soft and forms a sausage-shaped mass, which is kneaded by the two to the mass to rotating rollers.
• Additives such as reinforcing resin, magnesium and / or zinc oxide and possibly stearic acid are added right at the beginning with the polychloroprene rubber and kneaded for 5 minutes. Then, on a mixing roll with two counter-rotating rolls with a gap of 1 to 5 mm, the so-called rubber skin is formed. This is the material soft and forms a sausage-shaped mass, which is kneaded by the two
• a homogeneous coat After about 5 minutes premixing, a homogeneous coat has formed. Now the desired amount of abrasive grain can be added. The abrasive grain is thus rolled into the coat. Through the gap falling abrasive grain is added again until all abrasive grain has been incorporated into the coat. Now, the shapes desired as grinding tools are punched out of the coat and cured for one hour at 160 ° C in a vulcanization press.
• Cups with a polyurethane bond are prepared by simply mixing all the components and then pouring them into molds, followed by curing for 10 to 20 hours at 110 ° C. Then the cup wheels are cut to the desired width and assembled.
• abrasive grain in this document, the term abrasive grain is also used when the grinding wheels are used for polishing - are mainly used corundum and silicon carbide.
• Other abrasive articles used for polishing purposes are silicates, various metal oxides such as e.g. Iron or chromium oxides, emery, quartz, boron nitride (CBN), diamond, boron carbide, and especially the cerium oxide already mentioned above.
• Garnets are silicates that are used as gemstones and u.a. used for water jet cutting.
• the font DE 2651563 discloses a polishing process for glass surfaces with zirconium or ceria and a liquid.
• the font DE 69925124 T2 discloses a method for grinding and polishing glass.
• the font DE 69818107 T2 reveals grinding tools with garnet.
• the font DE 3855176 T2 discloses articles for polishing glass surfaces comprising a three-dimensional mesh of organic fibers, certain abrasive particles having an average particle size of 50 to 175 microns, fibers adhering to the fibers selected from potassium tetrafluoroborate, rare earth metal oxide and mixtures thereof, and a binder Binder that the fibers bonded together and with the abrasive particles and polishing aids.
• the grinding or polishing tool is a grinding or polishing pot.
• the replacement of the usual corundum abrasive grain by garnet in the polishing bodies led to a superior optical quality of the glass edge processing. It is preferred if garnet with a grain size (d50) of 1 .mu.m to 600 .mu.m is used. It is very particularly preferred if the garnet used is produced by machine comminution.
• the proportion of garnet in the total content of abrasive grain is 70 to 100 wt.%. It is particularly preferred if the proportion of the garnet in the total content of abrasive grain is 70 to 99% by weight, very particularly preferably 90 to 98% by weight.
• the polymeric composition (also referred to as elastic bond) is selected from polyurethane, polyisocyanurate, rubber (based inter alia on natural rubber, polychloroprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, silicone rubber, etc.), epoxy resin, polyester ( UP) resin, phenolic resole resin, phenol novolac, polyimide and rubber-epoxy hybrid systems, more preferably polyurethane or rubber.
• the invention also includes a method of polishing glass, characterized in that at least one rotating grinding or polishing tool is used from a garnet-containing (also referred to as elastic bond) polymeric mass.
• the grinding or polishing tool is a grinding or polishing pot.
• Garnet with a grain size (d50) of 1 .mu.m to 600 .mu.m is particularly preferred. It is very particularly preferred if the garnet used by Machine crushing is produced. It is preferred if the proportion of the garnet in the total content of abrasive grain is 50 to 100 wt.%. It is particularly preferred if the proportion of the garnet in the total content of abrasive grain is 70 to 99% by weight, very particularly preferably 90 to 98% by weight.
• the polymeric composition (also referred to as elastic bond) is selected from polyurethane, polyisocyanurate, rubber (based inter alia on natural rubber, polychloroprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, silicone rubber, etc.), epoxy resin, polyester ( UP) resin, phenolic resole resin, phenol novolac, polyimide and rubber-epoxy hybrid systems, more preferably polyurethane or rubber.
• polyurethane polyisocyanurate
• rubber based inter alia on natural rubber, polychloroprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, silicone rubber, etc.
• epoxy resin based inter alia on natural rubber, polychloroprene rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, silicone rubber, etc.
• epoxy resin based inter alia on natural rubber, polych
• Granulations are given according to the FEPA F or P series.
• the finished ring is then provided with a bottom support, finished the polishing pot.
• Arcol Polyol 1104 90.00 Polyether polyol, OHZ55, Bayer 1,4 butanediol 12,00 crosslinkers Dabco DC 198 1.50 Wetting agent, Air Products water 1.60 Waterworks Kalten Wegn Desmodur 44V10 77.60 MDI, Bayer Total binding 182.70 grain content 82,50 wt% Abrasive grain * 861.30 * Abrasive grain of the grade normal corundum brown, each in grain sizes F40 and F60, and garnet in the grain sizes F40 and F60, respectively.
• the binding components were placed in the bucket, the grain added.
• the mass was poured into a mold.
• the density was 1.25 g / cm 3 .
• the mold was sealed and annealed at 110 ° C for 15 h.

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

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Family Applications (1)

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Citations (4)

• 2012
  • 2012-03-08 DE DE102012004454A patent/DE102012004454A1/de not_active Ceased
• 2013
  • 2013-03-07 EP EP20130001144 patent/EP2636487A2/fr not_active Withdrawn

Patent Citations (4)

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