EP2150149B1 - Schleiffilament und -bürste - Google Patents

Schleiffilament und -bürste Download PDF

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Publication number
EP2150149B1
EP2150149B1 EP08780575.0A EP08780575A EP2150149B1 EP 2150149 B1 EP2150149 B1 EP 2150149B1 EP 08780575 A EP08780575 A EP 08780575A EP 2150149 B1 EP2150149 B1 EP 2150149B1
Authority
EP
European Patent Office
Prior art keywords
brush
abrasive
percent
filaments
weight
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.)
Not-in-force
Application number
EP08780575.0A
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English (en)
French (fr)
Other versions
EP2150149A1 (de
Inventor
Yeun-Jong Chou
Dean S. Holmes
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3M Innovative Properties Co
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3M Innovative Properties Co
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Publication of EP2150149A1 publication Critical patent/EP2150149A1/de
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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B13/00—Brushes with driven brush bodies or carriers
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B13/00—Brushes with driven brush bodies or carriers
    • A46B13/001—Cylindrical or annular brush bodies
    • A46B13/003—Cylindrical or annular brush bodies made up of a series of annular brush rings; Annular brush rings therefor
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • 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
    • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
    • B24D13/10—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising assemblies of brushes
    • 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
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/30—Brushes for cleaning or polishing
    • A46B2200/3093—Brush with abrasive properties, e.g. wire bristles

Definitions

  • This disclosure relates to abrasive articles, more specifically to abrasive filaments, articles containing abrasive filaments and methods of using the same.
  • Polyamide, (nylon), filaments have been utilized since the 1950's as an alternative to natural filaments.
  • An extrusion process was developed for dispersing abrasive particles uniformly in a nylon matrix in the form of a filament ( U.S. Pat. Nos. 3,522,342 and 3,947,169 ).
  • As polyamide filaments wear new abrasive particles are exposed. Brushes utilizing such filaments are therefore considered to be regenerated during use.
  • Brushes incorporating abrasive bristles or filaments have been used for many years to polish, clean and abrade a wide variety of substrates. These brush products typically have a plurality of bristles or filaments that contact the substrate during an abrading process.
  • the brushes are generally made by mixing abrasive particles and any suitable thermoplastic binder together and then extruding the composition to form a bristle or abrasive filament. The abrasive filament is then cut to the desired length. A plurality of these abrasive filaments are then mechanically or adhesively combined to form a brush segment. A plurality of these brush segments may be installed on a hub or plate to form a brush.
  • Brushes including silicon carbide- or brown aluminum oxide-loaded filaments are widely commercially available. However, there is always a need for economical brushes having better performance characteristics.
  • WO 03/011782 discloses an amorphous material comprising Al 2 O 3 , ZrO 2 , and a metal oxide other than Al 2 O 3 or ZrO 2 , wherein at least a portion of the metal oxide other than Al 2 O 3 or ZrO 2 forms a distinct crystalline phase when the amorphous material is crystallized, wherein the amorphous material comprises at least 50 percent by weight collectively of the Al 2 O 3 and the ZrO 2 , based on the total weight of the amorphous material, wherein the amorphous material contains not more than 20 percent by weight collectively As 2 O 3 , B 2 O 3 , GeO 2 , P 2 O 5 , SiO 2 , TeO 2 , and V 2 O 5 , based on the total weight of the amorphous material, wherein the amorphous material has x, y, and z dimensions each perpendicular to each other, and wherein each of the x, y, and z dimensions is at least 25 micro
  • abrasive brushes including those having a plurality of bristles unitary with a backing which are desirably made by injection molding a mixture of polymer and abrasive particles.
  • the present invention provides an abrasive airbrush and a method of refining the surface of a substrate with a brush as defined by the claims.
  • the present disclosure provides a method of deburring a substrate having at least one burr, with a brush, the brush comprising bristles comprising eutectic alumina zirconia particles and a matrix of thermoplastic polymer, wherein the method comprises the steps of:
  • the present disclosure also provides a method of refining a substrate wherein the abrading efficiency exceeds 1.0.
  • the present disclosure also provides an abrasive filament comprising: a matrix of thermoplastic polymer; and a plurality of eutectic alumina zirconia particles interspersed throughout at least a portion of the matrix wherein the refining efficiency exceeds 1.0.
  • the present disclosure also provides an abrasive brush comprising: a plurality of abrasive filaments, said filaments comprising a matrix of thermoplastic polymer and a plurality of eutectic alumina zirconia particles interspersed throughout at least a portion of said matrix; and a securing element that functions to secure the plurality of abrasive filaments to form a brush wherein the refining efficiency exceeds 1.0.
  • Fig. 1 is a plan view of an exemplary brush as disclosed herein;
  • Fig. 2 is a longitudinal cross sectional view of one exemplary filament of the brush shown in Fig. 1 ;
  • Fig. 3a illustrates cut, wear, and efficiency data from testing of various polyamide abrasive brushes on a perforated steel plate
  • Fig. 3b illustrates cut, wear, and efficiency data from testing of various thermoplastic elastomer abrasive brushes on a perforated steel plate
  • Fig. 4a illustrates cut, wear, and efficiency data from testing of various polyamide abrasive brushes on a steel plate
  • Fig. 4b illustrates cut, wear, and efficiency data from testing of various thermoplastic elastomer brushes on a steel plate
  • Fig. 5a illustrates cut, wear, and efficiency data from testing of various polyamide abrasive brushes on an aluminum plate
  • Fig. 5b illustrates cut, wear, and efficiency data from testing of various thermoplastic elastomer brushes on aluminum plate
  • Fig. 6a illustrates cut data from testing of various polyamide abrasive brushes on a steel plate
  • Fig. 6b illustrates cut data from testing of various thermoplastic elastomer abrasive brushes on a steel plate
  • Fig. 7a illustrates cut data from testing of various polyamide abrasive brushes on an aluminum plate
  • Fig. 7b illustrates cut data from testing of various thermoplastic elastomer abrasive brushes on an aluminum plate
  • Fig. 8a illustrates burr height data from testing of various polyamide abrasive brushes on a perforated steel plate
  • Fig. 8b illustrates burr height data from testing of various thermoplastic elastomer abrasive brushes on a perforated steel plate.
  • the first type of abrasive filaments include a thermoplastic matrix with abrasive particles nearly uniformly interspersed in the matrix. In one embodiment, the abrasive particles are substantially uniformly interspersed throughout the thermoplastic matrix. This first type of filament results in a substantially homogeneous abrasive filament.
  • the other type, of which there are numerous sub-types include a sheath and a core, wherein the sheath and core are generally made from different materials. Such filaments are disclosed in U.S. Pat. No.
  • the term “interspersed” means that the abrasive particles are embedded within and located throughout the thermoplastic material that forms the filament.
  • “interspersed” means that the abrasive particles are embedded within and located throughout the thermoplastic matrix that forms the core or sheath, or both, as appropriate.
  • the particles are interspersed so as to create a substantially homogenous distribution, though not necessarily an absolutely homogenous distribution.
  • the majority of the particles are wholly embedded within the thermoplastic matrix, there may be some exposed particles at the surface that extend partially outside of the thermoplastic matrix.
  • an abrasive filament as described herein can have an aspect ratio of at least about 1. In an embodiment, the aspect ratio can be at least about 5. In an embodiment, the aspect ratio can be at least about 10. In an embodiment, the aspect ratio can be at least about 20.
  • the aspect ratio is defined as the length divided by the arithmetic average width.
  • the filaments can be of any length or width desired, and the cross-sectional shape can be for example, round, oval, square, triangular, rectangular, polygonal, or multilobal (such as trilobal, tetralobal, and the like) in cross-section. Additionally, the abrasive filaments may have a variable cross sectional area. For example, the filaments can be "wavy" or textured. Likewise, the filaments can be tapered.
  • the diameter of the abrasive filaments can generally range from about 0.01 to 100 mm. In an embodiment the diameter can range from about 0.05 mm to 50 mm. In an embodiment the diameter can range from about 0.1 mm to 25 mm. In an embodiment the diameter can range from about 0.2 mm to 10 mm. In an embodiment the diameter can range from about 0.25 mm to 5 mm.
  • the length of the filament, or trim length can range from about 1 to 1000 millimeters. In an embodiment the length of the filament can range from about 2 to 100 mm. In an embodiment the length of the filament can range from about 3 to 75 mm. In an embodiment the length of the filament can range from about 4 to 50 mm. In an embodiment the length of the filament can range from about 5 to 50 mm.
  • thermoplastic matrix refers to a material that is capable of being heated to a molten state and then subsequently cooled to a solid state.
  • the thermoplastic matrix can be any thermoplastic polymer or thermoplastic elastomer. Examples of particular materials that can be used as the thermoplastic matrix include, but are not limited to, polyamides, such as Nylon 6,12; and Hytrel® thermoplastic elastomers.
  • Abrasive filaments as described herein also include abrasive particles.
  • the abrasive particles typically have a particle size ranging from about 0.01 to 1000 micrometers, usually between about 1 to 150 micrometers.
  • the alumina zorconia abrasive particles may have a Mohs hardness of at least about 7, preferably of at least about 9.
  • An abrasive filament as described herein includes eutectic alumina zirconia abrasive particles.
  • a eutectic or eutectic mixture is a mixture of two or more phases at a composition that has the lowest melting point, and where the phases simultaneously crystallize from molten solution at this temperature.
  • Eutectic alumina zirconia can be produced by melting alumina, baddeleyite (Zr0 2 ), and other additives in an electric arc furnace. The molten product is cooled down rapidly on special cooling aggregates in order to obtain a microcrystalline and homogeneous crystal structure.
  • Eutectic alumina zirconia is commercially available from, for example, Triebacher Schleifsch (Villach, Austria).
  • the eutectic alumina zirconia particles have an angular grain shape.
  • the eutectic alumina zirconia particles include from 50 to 60 percent by weight of alumina. In an embodiment, the eutectic alumina zirconia particles include from 52 to 56 percent by weight of alumina. In an embodiment, the eutectic alumina zirconia particles include from 54 to 55 percent by weight of alumina. In an embodiment, the eutectic alumina zirconia particles include 54.5 percent by weight of alumina.
  • eutectic alumina zirconia particles can also include other compounds.
  • the eutectic alumina zirconia particles include titanium dioxide (TiO 2 ) and iron oxide (Fe 2 O 3 ).
  • the eutectic alumina zirconia particles contain from about 2 to 3 percent by weight TiO 2 ; in another embodiment about 2.5 percent by weight TiO 2 .
  • the eutectic alumina zirconia particles contains from about 0.1 to 0.5 percent by weight Fe 2 O 3; in another embodiment about 0.2 percent by weight Fe 2 O 3 .
  • the abrasive filament includes from 55 to 75 percent by weight of thermoplastic matrix, such as polyamide or thermoplastic elastomer.
  • the abrasive filament includes from 25 to 45 percent by weight of abrasive eutectic alumina zirconia particles.
  • Additives may also be added to the abrasive filaments during manufacture. Additives such as lubricants, soaps, antioxidants, UV stabilizers, dye, pigments, wetting agents, surfactants, plasticizers, anti-static agents, anti-rust agents, and other liquid materials may be added to the filaments.
  • Additives such as lubricants, soaps, antioxidants, UV stabilizers, dye, pigments, wetting agents, surfactants, plasticizers, anti-static agents, anti-rust agents, and other liquid materials may be added to the filaments.
  • One method of incorporating these types of materials into the thermoplastic matrix is to encapsulate the liquid materials into a shell that is able to withstand the extrusion temperatures. Such methods are generally well known in the art. The amounts of these materials would generally be selected to provide desired properties as would be known to those of skill in the art.
  • Abrasive filaments can also optionally include other additives, such as, for example, fillers (including grinding aids), fibers, antistatic agents, lubricants, wetting agents, surfactants, pigments, dyes, coupling agents, anti-rust agents, plasticizers, and suspending agents, Such additives can be blended directly into the thermoplastic matrix or can be added by other methods known to those of skill in the art. The amounts of these materials would generally be selected to provide desired properties as would be known to those of skill in the art.
  • Inorganic based particulate fillers can also be incorporated along with the abrasive particles.
  • useful fillers include but are not limited to metal carbonates (such as calcium carbonate (chalk, calcite, marl, travertine, marble and limestone), calcium magnesium carbonate, sodium carbonate, magnesium carbonate), silica (such as quartz, glass beads, glass bubbles and glass fibers), silicates (such as talc, clays (montmorillonite), feldspar, mica, calcium silicate, calcium metasilicate, sodium aluminosilicate, sodium silicate), metal sulfates (such as calcium sulfate, barium sulfate, sodium sulfate, aluminum sodium sulfate, aluminum sulfate), gypsum, vermiculite, wood flour, aluminum trihydrate, carbon black, metal oxides (such as calcium oxide (lime), aluminum oxide, titanium dioxide), and metal sulfites (such as calcium sulfite).
  • metal carbonates such
  • a grinding aid is defined as particulate material that the addition of which has a significant effect on the chemical and physical processes of abrading which results in improved performance.
  • the grinding aid will either 1) decrease the friction between the abrasive grains and the workpiece being abraded, 2) prevent the abrasive grain from "capping", i.e. prevent metal particles from becoming welded to the tops of the abrasive grains, 3) decrease the interface temperature between the abrasive grains the workpiece or 4) decrease the grinding forces.
  • the addition of a grinding aid increases the useful life of the abrasive filament. Grinding aids encompass a wide variety of different materials and can be inorganic or organic based.
  • the filament may also optionally include a toughening material.
  • toughening materials include, but are not limited to, rubber type polymers and plasticizers.
  • Specific examples of toughening materials include toluene sulfonamide derivatives, styrene butadiene copolymers, polyether backbone polyamide (commercially available from Arkema, Inc., under the trade designation PEBAX), rubber grafted onto polyamide (commercially available from duPont under the trade designation "ZYTEL FN”) and a triblock polymer of styrene-(ethylene butylene)-styrene (commercially available from Kraton Polymers LLC, under the trade designation "KRATON 1901 X").
  • Abrasive filaments as described herein may be incorporated into a wide variety of brushes, either assembled to form an open, lofty abrasive pad, or attached to various substrates.
  • Abrasive brushes, as disclosed herein include a plurality of abrasive filaments as disclosed herein, and a securing element. Generally, the securing element functions to secure the plurality of abrasive filaments to form a brush.
  • the filaments disclosed herein can be incorporated into brushes of many types and for myriad uses, such as cleaning, deburring, radiusing, imparting decorative finishes onto metal, plastic, and glass substrates, and like uses.
  • Brush types include wheel brushes, cylinder brushes (such as printed circuit cleaning brushes), mini-grinder brushes, floor scrubbing brushes, cup brushes, end brushes, flared cup end brushes, circular flared end cup brushes, coated cup and variable trim end brushes, encapsulated end brushes, pilot bonding brushes, tube brushes of various shapes, coil spring brushes, flue cleaning brushes, chimney and duct brushes, and the like.
  • the filaments in any one brush can of course be the same or different.
  • a non-limiting list of exemplary brushes in which the abrasive filaments described herein can be used include brushes such as those described in U.S. Pat. Nos. 5,016,311 , 5,083,840 , and 5,233,719 (Young et al. ), and U.S. Pat. No. 5,400,458 (Rambosek ).
  • one such brush construction has a securing element that includes a base layer, and a binder layer.
  • the abrasive filaments, or bristles are individually and uniformly embedded in the binder layer such that they project upward and are generally parallel to one another.
  • the base layer and the binder layer can be the same material or different materials and in general these layers are polymeric materials.
  • the base layer can be a flexible resilient polymeric open cell foam, a polyester material or a polyamide material.
  • a cotton, polyamide or polyester fabric can be incorporated into these polymeric materials.
  • the binder layer is usually a semi-rigid polymeric material such as a polyurethane, polyester, epoxy or polyamide.
  • the base layer and the binder layer are the same, they can be made of a polyurethane material.
  • the thickness of the base layer and binder layers can range between about 1 to 10 millimeters. In another embodiment, from about 2 to 5 millimeters. The larger the diameter of the bristles, the thicker the binder layer is.
  • An abrasive brush that includes an abrasive filament as described herein can be mounted via the securing element to an apparatus capable of inducing relative motion between a substrate and at least one of the abrasive filaments.
  • An abrasive brush can include only abrasive filaments described herein.
  • an abrasive brush can comprise a mixture of abrasive filaments described herein and polymeric filaments.
  • Such polymeric filaments include those without abrasive particles, and those including abrasive particles.
  • the polymeric filaments can include filaments made of, for example, polyamide, polypropylene, polyester, thermoplastic elastomer and polyethylene. In some cases the filaments can be hollow, which is well known in the brush art. In addition the polymeric filaments may contain abrasive particles such as those well known in the art like silicon carbide and aluminum oxide. The particle size of these abrasive particles will vary depending upon the application, but in general they can range from about 10 to 1000 micrometers. In another embodiment from about 15 to 120 micrometers.
  • the filaments will be nearly perpendicular to the binder layer, in other applications such as conveyor systems, the filaments will be placed at a specified angle or a specified tilt.
  • a bristle having abrasive particles with materials encapsulated therein are included.
  • encapsulated materials can include soaps, lubricants, anti-rust agents, and anti-static agents.
  • phosphoric acid (or a similar material) can be added to a bristle comprising abrasive particles.
  • a brush made with such bristles would be useful in the removal and/or neutralization of surface rust on articles such as, for example, automobiles, benches, and swingsets.
  • One embodiment as described herein can include a unitary injection molded abrasive brush.
  • molded brushes can be made as described in co-pending U.S. Pat. No. 5,679,067 , "Molded Abrasive Brush," (Johnson et al.).
  • a securing element can include a threaded stud.
  • the bristles can have an aspect ratio of at least about 2 and can be integrally molded with the base.
  • the molded abrasive brush comprises a thermoplastic matrix having abrasive particles interspersed throughout at least the bristles. The bristles extend generally perpendicular to the base layer, parallel to the axis of rotation of the molded abrasive brush.
  • FIG. 1 Another example of a unitary injection molded brush can be made as is disclosed in U.S. Pat. No. 5,903,951 , "Radial Brush Segment,” (lonta et al.).
  • the brush segment can be molded from a thermoplastic matrix having a plurality of abrasive particles interspersed throughout at least the bristles.
  • the molded brush segments can be generally circular, with the bristles extending radially outward in the plane defined by the central portion.
  • a plurality of brush segments can be combined to form a brush assembly.
  • FIGs. 1 and 2 show an exemplary embodiment of a unitary injection molded brush.
  • a brush includes molded brush segment 210 having a plurality of integrally molded filaments or bristles 218 extending from the outer edge 214 of the securing element 212.
  • the securing element 212 in this exemplary embodiment is shown as a cylindrical hub. Securing element 212 functions to secure the plurality of molded filaments 218 together to form a brush segment.
  • Each filament includes a matrix 228 having a plurality of abrasive particles 226, such as eutectic alumina zirconia particles interspersed throughout at least the bristles (the matrix 228 and particles 226 are illustrated in FIG. 2 which depicts an exemplary filament 218).
  • the molded brush segments can be generally circular, with the bristles extending radially outward in the plane defined by the securing element 212.
  • a plurality of brush segments can be combined to form a brush.
  • FIG. 1 illustrates the brush segment 210 in contact with a workpiece 100 at the contact region 102.
  • the securing element includes a cylindrical hub.
  • the abrasive filaments are bonded to the cylindrical hub.
  • One of skill in the art would know, having read this specification, how to manufacture such an abrasive brush.
  • the workpiece can be any type of material such as metal, metal alloys, exotic metal alloys, ceramics, glass, wood, wood like materials, composites, painted surface, plastics, reinforced plastic, stones, and combinations thereof.
  • the workpiece may also contain an unwanted layer or coating external over the workpiece surface. This coating may be for example paint, dirt, debris, oil, oxide coating, rust, adhesive, gasket material and the like.
  • the workpiece may be flat or may have a shape or contour associated with it.
  • the workpiece is aluminum. In one embodiment, the workpiece has at least one burr. A workpiece that includes at least one burr can generally be a perforated piece. In one embodiment, the workpiece is carbon steel.
  • the force at the abrading interface or contact region can range from about 0.98 N to over 980 N. Generally this range is between about 9.8 N to 490 N of force at the abrading interface.
  • a liquid present during abrading can be water, an organic compound, a mixture comprising water and oil, or combinations thereof. Examples of typical organic compounds include lubricants, oils, emulsified organic compounds, cutting fluids, soaps, or the like. These liquids may also contain other additives such as defoamers, degreasers, corrosion inhibitors, or the like.
  • the abrasive article may oscillate at the abrading interface during use. In some instances, this oscillation may result in a finer surface on the workpiece being abraded.
  • the brush as disclosed herein can be used by hand or used in combination with a machine to refine a surface by: cleaning a workpiece surface, including removing paint or other coatings, gasket material, corrosion, or other foreign material. At least one or both of the brush and the workpiece can be moved relative to the other.
  • the abrasive article or brush can be converted into a belt, tape rolls, disc, sheet, and the like.
  • brush discs can be secured to a back-up pad by an attachment means. These brush discs can rotate between about 100 to 30,000 revolutions per minute, typically between about 500 to 20,000 revolutions per minute.
  • An abrasive brush as disclosed herein can be used to deburr a substrate.
  • Methods of deburring a substrate generally include contacting the substrate with at least one bristle of an abrasive brush as described herein in a contact region; and inducing relative motion between the substrate and the at least one bristle.
  • a method of deburring can also optionally include applying a lubricant adjacent the contact region.
  • An abrasive brush as disclosed herein can also be used to refine a surface of a substrate.
  • Methods of refining the surface of a substrate generally include contacting the substrate with at least one bristle of an abrasive brush as described herein in a contact region; and inducing relative motion between the substrate and the at least one bristle, wherein the efficiency exceeds about 1.0.
  • abrasive brushes, and methods of using abrasive brushes can have associated brush efficiency or efficiencies, respectively.
  • a method of abrading a substrate can have an associated efficiency
  • a method of refining a surface of a substrate can have an associated efficiency.
  • Brush efficiency, or the efficiency of a method of using a brush is generally the ratio of the mass of the substrate cut or abraded by the brush in a time interval (for example, grams of substrate) to the mass of the brush that is worn in that same time interval (for example, grams of the brush).
  • the amount of the brush that is worn can be calculated by taking the difference in the brush weight before and after the substrate is worked upon.
  • the brush efficiency or the efficiency of the method of abrading a substrate, or refining a surface of a substrate is at least 1. Greater Greater magnitudes of brush efficiency imply better brush performance.
  • an abrasive filament as described herein can be made by (a) rendering a thermoplastic matrix molten and combining abrasive particles therewith; (b) extruding the molten thermoplastic matrix and abrasive particles; and (c) cooling the composition to a temperature sufficient to harden the molten thermoplastic matrix and thus form a hardened composition comprising a thermoplastic matrix having abrasive particles interspersed throughout.
  • Methods of making abrasive filaments with sheaths and cores include those disclosed is U.S. Pat. No. 6,352,471 (Bange et al. ) and U.S. Pat. No. 5,460,885, Barber et al. , and U.S. Pat. No. 5,427,595, Pihl et al.
  • the methods and apparatuses for forming such filaments as given therein can advantageously be modified as is within the knowledge of those skilled in the art to extrude monofilament embodiments as disclosed herein.
  • Abrasive filaments may also be made using unitary injection molding.
  • Such a method comprises the steps of: a) mixing a thermoplastic matrix and plastic abrasive particles together to form a mixture; b) heating the mixture to form a flowable material; and c) injecting the flowable material under pressure into a mold to form an abrasive brush, wherein the brush comprises a securing element, such as a generally planar flexible base or center portion, and a plurality of bristles extending from the base or center portion, wherein the bristles are integrally molded with the base.
  • a securing element such as a generally planar flexible base or center portion, and a plurality of bristles extending from the base or center portion, wherein the bristles are integrally molded with the base.
  • a single screw or a twin screw extruder can be utilized.
  • a CTM cavity transfer mixer
  • These extruders are known in the art of thermoplastic extrusion. Temperatures, material feed rates, hoppers, and the like are also known.
  • the abrasive particles can be mixed with the thermoplastic while the thermoplastic is either in the molten or solid state.
  • a single stream of polymer/plastic can be used to produce filaments as disclosed herein. In an alternate method, two individual feed streams can be used.
  • Abrasive particles may be added to the molten thermoplastic matrix through a feed port in the extruder into the molten thermoplastic matrix mass. In an embodiment, they can be added at a point early enough to afford adequate dispersal of abrasive particles throughout the molten thermoplastic matrix. Alternatively, abrasive particles may be distributed in the molten thermoplastic matrix coating via a second step (i.e. after the preformed core has been coated with molten thermoplastic matrix), such as by electrostatic coating.
  • Abrasive filaments as disclosed herein including a thermoplastic matrix and abrasive particles can be extruded into cross-sectional shapes such as circles, ovals, and ellipses, polygons such as, for example, squares, rectangles, hexagons, and trapezoids, stars, and any other shape.
  • a cold water quench can be located immediately downstream of the die through which the molten extruded or coextruded filament or the thermoplastic matrix coated preformed core passes to achieve rapid cooling of the molten thermoplastic matrix to form a hardened composition comprising thermoplastic matrix and abrasive particles.
  • the abrasive filament may then be cut into individual abrasive filaments having the desired length. Although it is within the scope of this disclosure to orient the filaments to increase their tensile strength prior to use, it is not necessary to do so.
  • the filaments may have a coating (e.g. a plastic coating) applied there over. It is also within the scope of this disclosure to have the abrasive particles protrude out of the filament.
  • the abrasive brush of the invention my be used in a method of deburring a substrate having at least one burr, wherein the method comprises the steps of: contacting the substrate with at least one bristle of the brush in a contact region; and inducing relative motion between the substrate and the at least one bristle.
  • the eutectic alumina zirconia particles may comprise from about 52 to 56 percent by weight of alumina, and the eutectic alumina zirconia particles comprise from 38 to 43 percent by weight of zirconia.
  • the abrasive particles may be substantially uniformly interspersed throughout said filament.
  • the securing element may comprise a cylindrical hub, and
  • the eutectic alumina zirconia particles comprise from 50 to about 60 percent by weight of alumina, preferably from 52 to about 56 percent by weight of alumina.
  • the eutectic alumina zirconia particles may comprise from 38 to 43 percent by weight of zirconia.
  • the securing element may comprise a cylindrical hub, and wherein said filaments are bonded to said hub.
  • an abrasive filament comprising: a matrix of thermoplastic polymer; and a plurality of eutectic alumina zirconia particles interspersed throughout at least a portion of the matrix, wherein the efficiency of abrading a workpiece is at least about 1.0.
  • Said matrix of thermoplastic polymer may comprise a polymer selected from polyamide and thermoplastic elastomer.
  • the eutectic alumina zirconia particles comprise from about 50 to about 60 percent by weight of alumina, preferably from 52 to about 56 percent by weight of alumina.
  • the eutectic alumina zirconia particles may comprise from 35 to 45 percent by weight of zirconia, or from 38 to 43 percent by weight of zirconia.
  • the abrasive filament comprises 55 percent to about 75 percent by weight of thermoplastic polymer; and 25 percent to 45 percent by weight of eutectic alumina zirconia particles.
  • Said abrasive particles may be substantially uniformly interspersed throughout said filament.
  • the eutectic alumina zirconia particles comprise from 50 to 60 percent by weight of alumina, preferably from 52 to 56 percent by weight of alumina.
  • the eutectic alumina zirconia particles may comprise from about 38 to 43 percent by weight of zirconia.
  • the abrasive brush may further comprise a securing element that functions to secure the plurality of abrasive filaments to form a brush.
  • Said securing element may comprise a cylindrical hub, wherein said abrasive filaments are bonded to said hub.
  • Abrasive filled filaments were made using a Werner-Pfleider twin screw extruder.
  • the filaments were nominally 0.71 mm (0.028 inch) diameter and used polyamide ("ZYTEL 158 NC010" nylon 6,12 resin (E.I. DuPont de Nemours & Co., Wilmington, DE) or a compound of thermoplastic elastomer "HYTREL 6356 polyester TPE resin (E.I. DuPont de Nemours & Co., Wilmington, DE) and lubricant "MB50-010" (MultiBase, Copley, OH) as the matrix.
  • Hytrel 6356 and MB50-010 Pellets of Hytrel 6356 and MB50-010 were mechanically mixed to attain a homogeneous mixture; this mixture was fed into the feed port of the extruder.
  • the abrasive mineral was introduced into the molten polymer via a vent port in the extruder using a gravimetric feeder to maintain correct resin:mineral weight ratios.
  • mineral addition weights were adjusted to accommodate differences in density between aluminum oxide and silicon carbide and alumina-zirconia eutectic mineral.
  • the filaments that were made are shown below in Table 1.
  • the filaments were converted into 8 inch nominal OD x 2 inch ID x 1 inch wide (20.32 x 5.08 x 2.54 cm) brushes (Tanis Inc., Delafield, WI). The brushes were made with nominal 2.54 and 5.08 cm (1 inch and 2 inch) trim lengths. A constant fiber density was maintained between brushes of the same trim length. A single brush was constructed with each filament type.
  • Tests were conducted by running the brushes at 1750 rpm and placing them in contact with a test substrate for 150 seconds, followed by cooling for 30 seconds, and repeating for two more cycles under a load of 22.24 N (51bf).
  • the test substrate was moved at a speed of 7.62 cm/sec (3 inch/second) up and down over a distance of 17.78 cm (7 inches) during the test.
  • Brush cut and wear were calculated as the change in test substrate weight and brush weight before and after the test, respectively.
  • the performance of the brushes was measured by "brush efficiency", which was calculated by determining the mass of substrate abraded away by the brush in a time interval divided by the mass of the brush lost in that same time interval. Greater magnitudes of brush efficiency connote better brush performance.
  • the 2 inch (5.08 cm) trim brushes were run against the burr side of perforated cold roll steel plate to replicate deburring operations ( FIG. 3a and 3b ).
  • the 1 inch (2.54 cm) trim brushes were run against 1008 cold roll steel plate ( FIG. 4a and 4b ) and 6061 T6 aluminum plate ( FIG. 5a and 5 b ) to replicate finishing/cleaning operations.
  • Figs. 3a-5b show the results of this testing.
  • the second data set of a brush is the second consecutive run of the product.
  • the 1 inch (2.54 cm) trim brushes were first run on the carbon steel plate (twice) and then on the aluminum plate (twice).
  • the brush made with ZK40 outperformed brown aluminum oxide (BAO) and silicon carbide (SiC) on all three surfaces.
  • BAO brown aluminum oxide
  • SiC silicon carbide
  • test “run” was conducted by running the brushes at 1750 rpm and placing them in contact with a test substrate (carbon steel or aluminum) for 150 seconds, followed by cooling for 30 seconds, and repeating for two more cycles under a load of 22.24 N (5 lbf).
  • the test substrate was moved at a speed of 7.62 cm/sec (3 inch/second) up and down over a distance of 17.78 cm (7 inches) during the test.
  • Brush cut was calculated as the change in test substrate weight before and after the test. The test run was repeated consecutively four more times.
  • trim brushes manufactured as in Example 1 were run against a 1008 cold rolled steel plate ( FIG. 6a and 6b ) and a 6061 T6 aluminum plate ( FIG. 7a and 7b ) to replicate finishing/cleaning operations.
  • the 1 inch (2.54 cm) trim brushes were first run on the carbon steel plate and then on the aluminum.
  • the brushes that included ZK 40 had comparable or better results on both carbon steel and aluminum.
  • Filaments were converted into brushes for testing as discussed in Example 1.
  • Test brushes were mounted on an arbor with a means for rotating them to 1750 rpm.
  • the burr side (the perforating die exit side) of a metal workpiece consisting of a 50 mm x 280 mm piece of 16 gauge (1.5189 mm thick) 1008 CRS perforated screen (4 mm diameter staggered holes, 46% open, stock pattern number 041, commercially available from Harrington & King Perforating Company, Chicago, IL) was urged against the rotating brush in each case with a force of 22.2 N.
  • the test metal perforated screen was moved up at the rate of 76 mm/second traversing a stroke of 178 mm.
  • the perforated screen was separated from the brush, moved back to its original position, and re-engaged with the brush for another stroke. This was repeated for a total of 3 strokes.
  • the perforated screen was rotated 180 degrees in-plane (to simulate a "downstroke") and another 3 strokes were completed, thereby providing a test specimen that had been deburred 3 upstrokes and 3 downstrokes (3U3D).
  • Two additional perforated screens were deburred with each test brush, one 6U6D and the other 8U8D.
  • the height of residual burrs following deburring was measured on a centrally-disposed hole in each test screen by vertical scanning interferometry using a WYCO NT9800 Optical Profiling System (Veeco Instruments Inc., Woodbury, NY) set at 2% modulation threshold with a 10x objective and a 0.5x transfer lens producing a unified image via stitching mode. Measurements were made at eight locations spaced at 45 degrees around each hole. The results are shown in Table 2 below and graphically in FIG.
  • FIGs. 1a to 1b show that TPE matrix brushes are more efficient at burr removal on carbon steel than polyamide brushes under the test conditions used. Deburring tests were carried out on perforated aluminum and showed similar results.

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

Claims (7)

  1. Verfahren zum Verfeinern der Oberfläche eines Substrats mit einer Bürste, wobei die Bürste mehrere Filamente oder Borsten aufweist, die eutektische Aluminiumoxid-Zirkoniumdioxid-Teilchen und eine Matrix aus thermoplastischem Polymer aufweisen, wobei das Verfahren die folgenden Schritte umfasst:
    Kontaktieren des Substrats mit mindestens einem Filament oder einer Borste der Bürste in einer Kontaktregion; und
    Hervorrufen einer Relativbewegung zwischen dem Substrat und dem mindestens einen Filament oder der mindestens einen Borste, wobei die Effizienz mindestens 1,0 beträgt, wobei die Effizienz durch Bestimmen der Masse von Substrat, die durch die Bürste innerhalb einer Zeitspanne abgetragen wird, geteilt durch die Masse der Bürste, die innerhalb derselben Zeitspanne verlorengeht, errechnet wird, wenn die Bürste mit einer Stutzlänge von 2,54 cm gegen ein Arbeitsstück, das aus einer Platte aus kaltgewalztem Stahl 1008 besteht, mit 1750 UpM in Kontakt mit dem Arbeitsstück laufengelassen wird und das Arbeitsstück mit einer Geschwindigkeit von 7,62 cm/sec über eine Entfernung von 17,78 cm 150 Sekunden lang auf- und abbewegt wird, gefolgt von Kühlen für 30 Sekunden und Wiederholen für zwei weitere Zyklen unter einer Belastung von 22,24 N, wobei das mindestens eine Filament oder die mindestens eine Borste 55 Gewichtsprozent bis 75 Gewichtsprozent thermoplastisches Polymer und 25 Gewichtsprozent bis 45 Gewichtsprozent eutektische Aluminiumoxid-Zirkoniumdioxid-Teilchen aufweist, wobei die eutektischen Aluminiumoxid-Zirkoniumdioxid-Teilchen 50 bis 60 Gewichtsprozent Aluminium aufweisen.
  2. Verfahren nach Anspruch 1, wobei die Matrix aus thermoplastischem Polymer ein Polymer umfasst, das ausgewählt ist aus Polyamid und thermoplastischem Elastomer.
  3. Verfahren nach Anspruch 1, wobei die eutektischen Aluminiumoxid-Zirkoniumdioxid-Teilchen 35 bis 45 Gewichtsprozent Zirconiumdioxid aufweisen.
  4. Schleifbürste mit
    mehreren Schleiffilamenten oder Borsten, wobei die Filamente oder Borsten eine Matrix aus thermoplastischem Polymer und mehrere eutektische Aluminiumoxid-Zirkoniumdioxid-Teilchen aufweisen, die durch mindestens einen Teil der Matrix verstreut sind; und
    einem Befestigungselement, das zum Befestigen der mehreren Schleiffilamente oder Borsten zur Bildung einer Bürste dient,
    wobei die Schleifeffizienz auf einem Arbeitsstück mindestens 1,0 beträgt, wobei die Effizienz mindestens 1,0 beträgt, wobei die Effizienz durch Bestimmen der Masse von Substrat, die durch die Bürste innerhalb einer Zeitspanne abgetragen wird, geteilt durch die Masse der Bürste, die innerhalb derselben Zeitspanne verlorengeht, errechnet wird, wenn die Bürste mit einer Stutzlänge von 2,54 cm gegen ein Arbeitsstück, das aus einer Platte aus kaltgewalztem Stahl 1008 besteht, mit 1750 UpM in Kontakt mit dem Arbeitsstück laufengelassen wird und das Arbeitsstück mit einer Geschwindigkeit von 7,62 cm/sec über eine Entfernung von 17,78 cm 150 Sekunden lang auf- und abbewegt wird, gefolgt von Kühlen für 30 Sekunden und Wiederholen für zwei weitere Zyklen unter einer Belastung von 22,24 N, wobei das Schleiffilament oder die Borste 55 Gewichtsprozent bis 75 Gewichtsprozent thermoplastisches Polymer und 25 Gewichtsprozent bis 45 Gewichtsprozent eutektische Aluminiumoxid-Zirkoniumdioxid-Teilchen aufweist, wobei die eutektischen Aluminiumoxid-Zirkoniumdioxid-Teilchen 50 bis 60 Gewichtsprozent Aluminiumoxid aufweisen.
  5. Schleifbürste nach Anspruch 4, wobei die Matrix aus thermoplastischem Polymer ein Polymer umfasst, das ausgewählt ist aus Polyamid und thermoplastischem Elastomer.
  6. Schleifbürste nach Anspruch 4, wobei die eutektischen Aluminiumoxid-Zirkoniumdioxid-Teilchen 35 bis 45 Gewichtsprozent Zirkoniumdioxid aufweisen.
  7. Schleifbürste nach Anspruch 4, wobei die Schleifteilchen im Wesentlichen gleichförmig durch das Filament oder Borste hindurch verstreut sind.
EP08780575.0A 2007-05-10 2008-04-29 Schleiffilament und -bürste Not-in-force EP2150149B1 (de)

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US91717207P 2007-05-10 2007-05-10
PCT/US2008/061852 WO2008140929A1 (en) 2007-05-10 2008-04-29 Abrasive filament and brush

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EP2150149B1 true EP2150149B1 (de) 2013-05-22

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WO2008140929A1 (en) 2008-11-20
EP2150149A1 (de) 2010-02-10
US20080280541A1 (en) 2008-11-13

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