EP1827762B1 - Schleifmittel und verfahren zu dessen herstellung - Google Patents

Schleifmittel und verfahren zu dessen herstellung Download PDF

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Publication number
EP1827762B1
EP1827762B1 EP05809970.6A EP05809970A EP1827762B1 EP 1827762 B1 EP1827762 B1 EP 1827762B1 EP 05809970 A EP05809970 A EP 05809970A EP 1827762 B1 EP1827762 B1 EP 1827762B1
Authority
EP
European Patent Office
Prior art keywords
matrix
abrasive
abrasive grains
binder
backing
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.)
Expired - Lifetime
Application number
EP05809970.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1827762A1 (de
Inventor
Klaus-Peter Spies
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.)
Klingspor AG
Original Assignee
Klingspor AG
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 Klingspor AG filed Critical Klingspor AG
Publication of EP1827762A1 publication Critical patent/EP1827762A1/de
Application granted granted Critical
Publication of EP1827762B1 publication Critical patent/EP1827762B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • 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

Definitions

  • the invention generally relates to an abrasive in which abrasive grains are embedded in a matrix of a binder, and in which an abrasive grain-filled contact surface is formed to grind a workpiece.
  • a good coating of the filler or the abrasive grains is achieved be, in the sense of US 2,825,838 A from 1985 a liquid, rubbery copolymer can be used as a binding aid.
  • An elastomeric design of the cured binder is not provided.
  • abrasive bodies with elastically yielding binders are compact bodies, for example as cuboids, or else shaped compact or solid abrasive bodies, for. B. as a grinding wheel. Both cellular and cell-free versions are known.
  • the known compact bodies of this kind have been and are regularly cast as a whole in a mold, as has been practiced on the applicant side for four decades.
  • the invention further relates specifically to abrasives with cell-free, in particular unfoamed, binder in the already mentioned contrast to cellular, especially foamed, binder.
  • the elastically yielding compact bodies mentioned in the introduction to the state of the art or "solid" in the grouping mentioned are in particular cast elastomers.
  • the abrasives according to the invention also use cast elastomers in particular.
  • the cell-free binder abrasives to which the invention relates are distinguished in that they are neither physically nor chemically foamed by appropriate concrete process control.
  • the objective is rather to avoid foaming within the maximum possible range.
  • remaining cell formations can not be completely avoided. Therefore, in any case, in describing the particular marketable abrasive product, the reference to actual and theoretical densities appears to be the most appropriate in practice.
  • the PUR is used massively, in particular with a density of not less than 800 kg / m 3 , which adequately describes the minimum porosity.
  • Abrasive on a base in which the abrasive article has a cellular and in particular foamed binder, in contrast, for example, from DE 31 14 001 A1 and the DE 19 07 983 A1 known.
  • the invention relates specifically to abrasives whose abrasive article has a thermosetting binder of the abrasive grains.
  • the invention refers back to itself as binders of abrasive grains of abrasive articles per se known thermosets, such as those made of polyurethane. Also rubber can be used in the context of the invention as a binder of the abrasive grains.
  • thermoplastic binder of the abrasive grains in the form of a plasticized Kolloxylins shows the contrast DD 106 585 A , which, unlike the thermosets used in the context of the invention, additionally requires the use of a plasticizer or "plasticizer" with approximately the same proportion (1: 1 or 0.8: 1). Also, to avoid smearing of the abrasive article, a level of at least 60 weight percent of the abrasive powder in the abrasive article is required, incidentally a proportion of more than 80 percent of the abrasive powder is believed to adversely affect adhesion of the abrasive article.
  • This known abrasive article is specially designed for the formation of the abrasive article as an extremely thin layer of abrasive with a thickness of the layer, measured perpendicular to the base, in the range of 10 microns to a maximum of 40 microns.
  • a rather exotic known abrasive is mentioned whose binder is kneadable for the abrasive grains and thus to adapt to predetermined profiles of a workpiece surface to be ground ( DD 255 903 A1 ).
  • endless abrasive belts have been considered to support an endless belt having strip-shaped abrasive bodies as a base, the matrix containing the abrasive grains being each formed by a flexible polyurethane foam, these abrasive bodies being individually applied to the endless belt by means of a separate belt Adhesive were attached (see. GB-B 821929 , especially page 2 lines 3 to 7).
  • this idea requires a production effort disproportionate for mass production by cutting the abrasive body and their separate bonding and has therefore found no input into practice.
  • abrasive grains whose grain size is selected according to the desired result directly to a base by means of an inelastic binder such as skin glue and now synthetic resin.
  • This pad absorbs tensile and centrifugal forces generated by the machine.
  • the abrasive grains are fixed only one layer on the substrate and each protrude with protruding sections from the grinding with the workpiece in grinding engagement passing contact surface. As soon as the protruding sections have worn out in the grinding operation so far that the binder comes into frictional contact with the workpiece, the efficiency of grinding decreases significantly and there is undesirable smearing of the binder on the ground surface of the workpiece.
  • the matrix is divided into a plurality of spaced matrix bodies which increase toward the backing in the direction from the respective free contact surface with the workpiece Cross-section parallel to the base have ( DE-T2 69210221 ).
  • the invention has for its object to provide an abrasive referred to in the preamble of claim 1, which is suitable as a mass-produced or mass-produced rational mass production or mass production for use as a "finishing" tool on modern grinding machines and a long service life united with high consistent "finishing" quality.
  • a contact surface filled with abrasive grains is already provided in the new state, which possibly has to be exposed in the last phase of the production process by detaching a covering binder skin of the binder of the matrix.
  • protrude from the thus obtained original first contact surface with the workpiece still sections of the abrasive grains.
  • these protruding portions of the abrasive grains are wholly or substantially pressed into the matrix, substantially eliminating abrasive erosion on the workpiece.
  • the support ensures the same quality of work regardless of the degree of use of the matrix even with the high operating parameters such as speed, belt speed or characteristic values of an oscillation.
  • the preparation of the abrasive according to the invention can be made rationally and inexpensively in a few steps.
  • the abrasion is essentially determined by the choice of the binder, the optionally added fillers and the grain type of the abrasive grains.
  • the binder can be adjusted specifically.
  • Abrasive is particularly effective in "finishing" relatively rough workpiece surfaces. These can be leveled to extremely fine and defect-free surfaces even if the abrasive grains in the abrasive according to the invention are relatively coarse.
  • the claims 2 to 41 relate to advantageous developments of the abrasive according to the invention and the claims 42 to 47 preferred manufacturing method for the abrasive according to the invention.
  • an abrasive article whose elastically yielding matrix comprises a cell-free thermosetting binder, directly, ie without the intervention of a separate adhesive layer, applied to a flexible pad to form an integral body, wherein in use of the abrasive continuously abraded abrasive grains can be replaced out of the depth of the matrix and this can be continued until complete or near exhaustion of the abrasive article to the flexible backing without loss of abrasive quality.
  • the elastic-resilient training of Grinding matrix and abrasive grains can give the entire abrasive in conjunction with the flexibility of the pad its own flexibility that can be selected adapted to the application.
  • the same abrasive can be made available to the consumer irrespective of whether or not the latter must be flexible during sanding. As a result, it is unnecessary in many applications, for such in the need for flexibility of the abrasive different applications to keep several abrasives in stock in stock.
  • Claims 2 and 3 relate to preferred upper and lower limits of the density of the binder in the matrix or the abrasive body.
  • the claims 4 to 8 relate to preferred selection criteria with respect to the elastic-resilient design of the matrix in terms of elasticity (claims 4 and 5), hardness (claims 6 and 7) and elongation at break (claim 8).
  • Claim 9 specifies preferred criteria under which the backing of the matrix or of the abrasive body is considered to be flexible.
  • the claims 10 and 11 relate to preferred dimensions of the thickness of the matrix perpendicular to the substrate in terms of minimum thickness (claim 10) and maximum strength (claim 11).
  • Presently preferred for use strengths are 1000 microns, ie 1.0 mm, and 1500 microns, ie 1.5 mm.
  • a particularly noteworthy application of the invention is in this sense the production of the abrasive as a flat material, in particular as a web.
  • Claims 12 and 13 relate to preferred measures of the ratio of the volume fractions of the abrasive grains and the binder of the matrix with a lower limit (claim 12) and an upper limit (claim 13).
  • Claim 14 indicates preferred grain size ranges of the abrasive grains.
  • Claim 15 indicates preferred size ranges of the Shore hardness of the abrasive.
  • Claims 16 to 20 relate to preferred materials for the cell-free thermosetting binder. This may be filled according to industry standard manner according to claim 21, to which specify the claims 22 and 23 specific recipes.
  • Claim 24 relates to a special formulation in the event that the binder can foam in the nature of what should be avoided as much as possible within the scope of the invention.
  • Claim 24 provides for the use of specifically a foam inhibitor as an additive to the binder.
  • Claims 25 and 27 relate to preferred choices of the type of abrasive grains.
  • Claim 28 relates to a preferred arrangement of the abrasive grains in the matrix.
  • Claims 29 to 32 relate to preferred subdivisions of the matrix into individual matrix bodies.
  • the claims 33 to 36 relate to preferred designs of the pad.
  • the claims 37 to 40 relate to preferred geometric shapes of the abrasive for different grinding tools.
  • Claim 41 finally relates to a preferred embodiment of the original contact surface of the abrasive in its marketable training prior to its use on the workpiece to be sanded.
  • the variant according to claim 37 with formation of the abrasive according to the invention as an endless belt.
  • the action on the workpiece in the same abrasive can also be varied by the location of the endless belt, the action on the workpiece.
  • Particularly noteworthy are the places of action on the one hand on a contact wheel and on the other hand on a free strand of the endless belt.
  • the hardness of the contact wheel and the Belt speed can serve as meaningful parameters.
  • the invention also relates to processes for the preparation of the abrasive according to the invention, cf. Claims 42 to 47.
  • Fig. 1 shows the contact surface of the abrasive in partial view
  • Fig. 2 an enlarged partial view of Fig. 1 according to the in Fig. 1 illustrated white circle
  • Fig. 3 in a further enlargement, the representation of a cross-sectional portion of the same abrasive perpendicular to the contact surface.
  • a flexible supporting pad 2 with a matrix 4 (in Fig. 3 dotted) consisting of an elastically yielding and cell-free thermosetting binder 6, for example, made of unfoamed polyurethane, as well as fillers and adhesives, glued, wherein in the matrix 4 in homogeneous distribution or parallel to the pad 2 layers of abrasive grains 8 are incorporated.
  • the binder 6 serves not only to bond the abrasive grains S in the matrix 4, but at the same time the matrix 4 with the pad 2, and thus makes a separate adhesive layer between matrix 4 and pad 2 unnecessary.
  • a free contact surface 10 is formed parallel to the base 2.
  • the contact surface 10 protrude when the abrasive is out of service, free burrs of the abrasive grains 8 under the restoring force of the elastically resilient binder 6 something out, which is not shown in the drawing.
  • the abrasive grains in the region of the free contact surface 10 in interaction with a workpiece, not shown, and against the restoring force of the elastically yielding binder 6 completely or substantially completely pressed into the matrix 4.
  • abrasive grains 8 project out of the contact surface only to the extent that, together with the binder 6 of the matrix 4, a microstructure is formed on the contact surface 10.
  • the illustrated special embodiment still has the following special feature:
  • the matrix 4 is subdivided into a plurality of regularly hexagonal matrix bodies 4 a whose boundary surfaces run on the hexagonal outline perpendicular to the base 2, so that regardless of the degree of wear of the matrix 4, the same regularly hexagonal cross section of the respective matrix body 4 a to the respective base 2 or remains parallel to the contact surface 10.
  • the matrix bodies 4a rise in each case individually from the base 2. In each case a uniformly dimensioned continuous light gap 12 remains between them, which starts from the base 2 and extends into the area of the contact surface 10.
  • the clear gaps 12 can be used for air or liquid cooling of the workpiece, not shown.
  • the matrix bodies 4a form a uniform honeycomb structure of the matrix 4.
  • the grinding direction 16 is selected so that it extends on the imaginary connecting line of two opposite corners of a matrix body 4a. These are in turn arranged offset from one another in each case in a gap, so that even in the case of destabilization of a matrix body 4a mutual support is provided on an adjacent non-destabilized matrix body 4a.
  • the stainless steel tubes are initially on a centerless grinder pre-sanded with a sanding belt grain size P80.
  • an endless belt according to the invention was used with the following characteristics: flexible cotton carrier about 320 g / m 2 as support, polyurethane as cell-free thermosetting binder with a layer thickness of 1200 ⁇ m, abrasive grain silicon carbide P60 in homogeneous distribution in the binder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP05809970.6A 2004-12-06 2005-11-25 Schleifmittel und verfahren zu dessen herstellung Expired - Lifetime EP1827762B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004058710 2004-12-06
PCT/EP2005/012637 WO2006061112A1 (de) 2004-12-06 2005-11-25 Schleifmittel und verfahren zu dessen herstellung

Publications (2)

Publication Number Publication Date
EP1827762A1 EP1827762A1 (de) 2007-09-05
EP1827762B1 true EP1827762B1 (de) 2013-09-11

Family

ID=35929652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05809970.6A Expired - Lifetime EP1827762B1 (de) 2004-12-06 2005-11-25 Schleifmittel und verfahren zu dessen herstellung

Country Status (7)

Country Link
US (1) US20090277098A1 (enExample)
EP (1) EP1827762B1 (enExample)
JP (1) JP4996475B2 (enExample)
KR (1) KR101287501B1 (enExample)
CN (1) CN101048259B (enExample)
BR (1) BRPI0518815A2 (enExample)
WO (1) WO2006061112A1 (enExample)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9492001B2 (en) * 2011-11-01 2016-11-15 Derma Dream Group Ltd. System and method for treating a surface
EP2895298B1 (en) * 2012-09-05 2021-10-20 Mirka Oy Flexible grinding product with flattened surface and method for manufacturing the same
RU2635229C2 (ru) * 2013-05-17 2017-11-09 3М Инновейтив Пропертиз Компани Легкоочищаемая поверхность и способ ее изготовления
DE102013112296A1 (de) * 2013-11-08 2015-05-13 Klingspor Ag Schleifmittel
EP3348355A1 (de) * 2017-01-16 2018-07-18 Klingspor AG Schleifkörper, insbesondere marmorierkörper
TWI656000B (zh) * 2018-03-27 2019-04-11 中國砂輪企業股份有限公司 Grinding tool
CN109227417A (zh) * 2018-10-31 2019-01-18 张家港智慧清洁技术研究院有限公司 一种电镀金刚石砂带及其制备方法
CN110421492B (zh) * 2019-06-12 2021-05-18 江苏君睿智能制造有限公司 一种用于冷轧型钢清洗的耐磨擦洗片

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Also Published As

Publication number Publication date
KR101287501B1 (ko) 2013-07-19
JP2008522837A (ja) 2008-07-03
WO2006061112A1 (de) 2006-06-15
KR20070085816A (ko) 2007-08-27
CN101048259A (zh) 2007-10-03
EP1827762A1 (de) 2007-09-05
BRPI0518815A2 (pt) 2008-12-09
US20090277098A1 (en) 2009-11-12
CN101048259B (zh) 2013-03-13
JP4996475B2 (ja) 2012-08-08

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