EP3337643B1 - Schleif-werkzeug sowie verfahren zur herstellung eines derartigen schleif-werkzeugs - Google Patents

Schleif-werkzeug sowie verfahren zur herstellung eines derartigen schleif-werkzeugs Download PDF

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Publication number
EP3337643B1
EP3337643B1 EP15753683.0A EP15753683A EP3337643B1 EP 3337643 B1 EP3337643 B1 EP 3337643B1 EP 15753683 A EP15753683 A EP 15753683A EP 3337643 B1 EP3337643 B1 EP 3337643B1
Authority
EP
European Patent Office
Prior art keywords
abrasive
filling resin
grinding
flaps
grinding tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15753683.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3337643A1 (de
Inventor
Bernd Stuckenholz
Peter WALDER
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.)
August Rueggeberg GmbH and Co KG
Original Assignee
August Rueggeberg GmbH and Co KG
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 August Rueggeberg GmbH and Co KG filed Critical August Rueggeberg GmbH and Co KG
Priority to PL15753683T priority Critical patent/PL3337643T3/pl
Publication of EP3337643A1 publication Critical patent/EP3337643A1/de
Application granted granted Critical
Publication of EP3337643B1 publication Critical patent/EP3337643B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B24D13/04—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising a plurality of flaps or strips arranged around the axis
    • 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
    • B24D13/06—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery the flaps or strips being individually attached
    • 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
    • B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
    • B24D13/16—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face comprising pleated flaps or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • B24D3/348—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties utilised as impregnating agent for porous abrasive bodies

Definitions

  • the invention relates to a grinding tool according to the preamble of claim 1.
  • the invention further relates to a method for producing a grinding tool.
  • the grinding lamellae used are made of coated abrasive.
  • the pad wears during the grinding process so that abrasive on the pad is removed and spent, and new abrasive is repeatedly looped.
  • the use of the grinding tool is all the more economical, the higher the tool life and the higher the total material removal during the machining of a workpiece to the complete wear of the grinding tool.
  • a flap disc which has a base plate and abrasive flaps attached thereto.
  • the sanding blades protrude beyond the edge of the base plate.
  • an open fabric is inserted, which extends beyond the edge of the base plate.
  • the portion of the abrasive flaps and the fabric that extends beyond the base plate forms an annular region.
  • an annular layer of abrasive-containing cured polymers supports the abrasive flaps on the base plate and anchors them to the base plate.
  • a flap disc is known in which grinding blades are arranged on a tool carrier.
  • the tool carrier comprises fibers that are bound and stabilized in a binder.
  • the invention has for its object to provide a grinding tool with a longer service life and a higher aromatic materialabtrag.
  • a grinding tool having the features of claim 1. It has been recognized that the abrasive flaps are subject to pronounced cyclic deflection in prior art abrasive tools. The cyclic deflection of the abrasive flaps results from the rotation of the abrasive tool and the grinding engagement of a certain number of adjacent abrasive flaps when machining a workpiece.
  • the extent of the cyclical deflection and thus the loading of the grinding lamellae is dependent on the inclination of the grinding tool relative to the workpiece surface to be machined, the width of the workpiece to be machined, the speed and the outer diameter of the grinding tool and the contact pressure, with the The grinding blades are pressed perpendicular to the workpiece surface in the grinding process. Due to the pronounced cyclical deflection of the abrasive flaps, the abrasives present in the form of abrasive particles or abrasive grains are torn from the backing before the abrasive has worn out and reached its material removal potential.
  • the abrasive layer is torn off by the torn out abrasive, that is, the torn out abrasive particles or abrasive grains, since adjacent abrasive particles can no longer support one another.
  • the service life and the total material removal of the grinding tool are thus greatly impaired by the pronounced cyclical deflection of the grinding lamellae.
  • the proportion of wear is at least constant relative to a similar grinding tool according to the prior art.
  • the stiffening of the abrasive flaps reduces the ratio of wear of the backing to the total material removal.
  • the total material removal and the service life of the grinding tool are variably increased.
  • the stiffening of the grinding lamellae takes place by providing the grinding lamellae with a filling resin and subsequent hardening of the filling resin.
  • the filling resin is, for example, selected from the group of thermosets, elastomers, synthetic resins and / or thermoplastics and combinations thereof.
  • the filling resin is a thermoset, for example a phenolic resin.
  • the phenolic resin is a resole or a novolac.
  • the filling resin should show no softening behavior to ensure a permanent stiffening of the grinding lamellae below a limit temperature. This means, for example, that the filling resin on reaching the limit temperature has a loss of strength compared to a strength at room temperature, which does not exceed a maximum allowable strength loss.
  • the limit temperature and the maximum allowable loss of strength depend on the desired degree of stiffening of the grinding blades.
  • At least one of the grinding lamellae has a hardened filling resin.
  • a plurality of abrasive lamellae comprise a cured filler resin, in particular at least 30%, in particular at least 50%, and in particular at least 60% of the abrasive lamellae fastened to the carrier body.
  • all grinding lamellae arranged on the supporting body have a hardened filling resin.
  • the grinding tool according to the invention is designed, for example, as flap disc, flap grinding disc or flap grinding pin.
  • the grinding tool has a central axis and is rotatably driven around the central axis for machining a workpiece by means of a tool drive.
  • the stiffening of the grinding lamellas reduces the cyclical deflection of the grinding lamellas, which increases the service life and the total material removal.
  • the grinding tool ensures in a simple manner a longer service life and a higher
  • the pad of the respective grinding blade is provided or impregnated with filling resin, which then hardens, the grinding blades can be effectively stiffened in a simple manner.
  • at least 70 wt .-%, in particular at least 80 wt .-%, in particular at least 90 wt .-%, and in particular 100 wt .-% of the cured filling resin are in the pad.
  • the respective pad has a carrier fabric with at least one thread.
  • the carrier fabric is formed for example as a carrier fabric, which is formed by warp threads and weft threads.
  • the carrier textile has at least one thread, which is provided or impregnated with the filling resin. After curing of the filling resin of at least one thread is stiffened. For example, in a textile fabric, the warp threads and the weft threads are stiffened.
  • the carrier textile thus has a high rigidity or bending stiffness, whereby the deflection of the respective grinding blade in the grinding process is greatly reduced.
  • a grinding tool according to claim 2 ensures effective stiffening and thus an increased service life and increased total material removal.
  • a grinding tool according to claim 3 ensures increased rigidity and thus a longer service life and a higher Bacmaterialabtrag.
  • the at least one strength-enhancing filler is, for example, fibrous, platelet-shaped and / or spherical.
  • Fibrous fillers are, for example, glass fibers, carbon fibers, synthetic fibers, cellulose, wollastonite and whiskers.
  • whiskers are called acicular single crystals.
  • the materials antimony, cadmium, indium, zinc and tin increasingly form whiskers (see. RJ Klein Wassink: Soft soldering in electronics, Eugen G. Leuze Verlag, 1991, pages 305-306 ).
  • Platelet-shaped fillers are, for example, mica, talc and graphite.
  • Spherical fillers are, for example, quartz, silica, kaolin, glass beads, calcium carbonate, metal oxides and carbon black.
  • Suitable strength-enhancing fillers are, for example, chalk and aluminum oxide (Al 2 O 3 ).
  • a grinding tool according to claim 4 ensures a longer service life and a higher Intelabtrag. Due to the at least one abrasive filler, the grinding properties of the grinding blades are improved and / or adjusted specifically for a particular application.
  • Abrasive active fillers are, for example, cryolite and potassium tetrafluoroborate (KBF 4 ).
  • the at least one abrasive filler for example, has a particle size in the nanoscale range.
  • the invention is further based on the object to provide a method for producing a grinding tool with a longer service life and a higher aromatic materialabtrag.
  • the advantages of the method according to the invention correspond the advantages already described of the grinding tool according to the invention.
  • the method according to the invention can in particular also be developed with the features of one of claims 1 to 5.
  • the stiffening of the grinding lamellas significantly reduces their cyclical deflection during the machining of a workpiece, which increases the service life and the total material removal.
  • the abrasive lamellae are provided, for example, by gluing, laminating or dipping with the filling resin.
  • the sanding lamellae are provided with the filling resin after the grinding lamellae have been arranged or fastened to the support body.
  • the method ensures in a simple manner, the stiffening of the grinding blades. Characterized in that the grinding blades are first arranged on the support body and then provided with filling resin, a plurality of abrasive flaps can be provided in the desired manner with filling resin and stiffened. For example, arranged on the support body grinding lamella are immersed with a desired orientation in a bath with filling resin.
  • the abrasive flaps are provided with the filling resin such that predominantly the respective backing absorbs the filling resin and / or the abrasive in the abrasive layer is usually not completely covered with the filling resin.
  • the respective pad comprises a carrier fabric, which is impregnated with the resin and receives this. After curing of the filling resin, the carrier fabric is stiffened, that is, has an increased bending stiffness. The curing of the filling resin is preferably carried out by supplying heat, for example by means of a furnace.
  • a method according to claim 7 ensures in a simple manner the production of a grinding tool with a longer service life and a higher Intelmaterialabtrag.
  • the sanding lamellae By immersing the sanding lamellae in a bath with filling resin, the sanding lamellae, in particular the respective backing, are soaked in a simple manner with the filling resin.
  • the abrasive flaps are so immersed in the filling resin bath that the filling resin drips easier from the abrasive due to the weight than from the substrate.
  • the abrasive flaps are immersed in the filling resin bath in such a way that the abrasive is directed in the direction of the weight or the base is directed against the weight force. This ensures that essentially the pad is impregnated with the filling resin.
  • a method according to claim 8 ensures in a simple manner, the oversizing of the grinding blades with filling resin.
  • the grinding blades are immersed in the filling resin bath such that the respective grinding blade is only temporarily immersed. In this way, it is ensured that the respective grinding blade is provided or impregnated during filling with filling resin and outside the filling resin bath, the filling resin can drip off of the abrasive or the abrasive layer.
  • the respective grinding blade is immersed in the filling resin bath several times during the rotation of the supporting body.
  • the respective abrasive lamella or the base of the respective abrasive lamella is soaked substantially to the saturation with filling resin.
  • a method according to claim 9 enables a simple adjustment of the stiffness and / or the grinding properties of the grinding blades.
  • a grinding tool 1 designed as a flap disc has a plate-shaped support body 2.
  • the support body 2 comprises an outer annular edge region 3 and a hub 4, which are connected via an annular web 5.
  • the hub 4 has a concentric, circular opening 6, which serves for clamping and rotational driving of the support body 2 about a central axis 7 by means of a tool drive, not shown.
  • the edge region 3 serves to receive abrasive lamellae 8.
  • the abrasive lamellae 8 are overlapping each other by means of an adhesive layer 9 on the edge region 3, that is attached laterally to the support body 2.
  • the grinding blades 8 are arranged on the support body 2 at equal angular intervals.
  • the grinding blades 8 each have a direction of rotation 10 viewed around the central axis 7, a trailing edge 11 and a leading edge 12 on.
  • Each of the grinding lamellae 8 forms a grinding-active region 13 which extends from its trailing edge 11 to the trailing edge 11 'of the grinding lamella 8 arranged upstream in the direction of rotation 10.
  • the respective leading edge 12 is covered by the upstream in the direction of rotation 10 grinding blade 8.
  • the grinding blades 8 are rectangular in shape and each have an inner edge 14 facing the center axis 7 and an outer edge 15 facing away from the center axis 7. By the outer edges 15 of the grinding blades 8, an outer diameter D of the grinding tool 1 is defined
  • the respective grinding blade 8 has a base 16, to which an abrasive layer 17 is applied.
  • the base 16 comprises a carrier textile 18 in the form of a textile fabric which is formed from warp threads 19 and weft threads 20.
  • the carrier fabric 18 is connected to the cover layer 21, which consists for example of a polymer dispersion, and is cured by drying.
  • the carrier textile 18 consists for example of polyester or cotton, while the polymer dispersion is usually composed of resin and / or a plastic dispersion.
  • the abrasive layer 17 comprises abrasive 22 which is secured to the backing 16 by a binder 23.
  • the abrasive 22 is in the form of abrasive particles or abrasive grains which are incorporated into the binder 23 together with support grains 24.
  • the binder 23 is formed, for example, as a binder resin.
  • the binder resin 23 and the filling resin 25 may be identical or different.
  • the grinding lamellae 8 each have a hardened filling resin 25.
  • the filling resin 25 is located in and / or on the respective substrate 16.
  • the warp threads 19 and the weft threads 20 of the carrier fabric 18 are provided with the filling resin 25 and stiffened due to the hardening of the filling resin 25.
  • the base 16 is, for example, padded, which means that a full-bath impregnation is carried out, wherein a penetration force through roller pairs results in a penetration, in particular up to 100%, before drying takes place.
  • the cured filling resin 25 has a weight fraction of 1 wt .-% to 30 wt .-%, in particular from 5 wt .-% to 25 wt .-%, and in particular from 8 wt .-% to, based on the total weight of a grinding blade 8 20% by weight.
  • the grinding tool 1 is produced as follows: The unfinished grinding tool is referred to before the hardening of the filling resin 25 with the reference numeral 1 'below.
  • a bath with the filling resin 25 is provided in a container 26, a bath with the filling resin 25 is provided.
  • the grinding tool 1 ' is set to dip the grinding blades 8 so inclined that the central axis 7 relative to a surface 27 of the filling resin 25 forms an angle ⁇ .
  • For the angle ⁇ preferably: ⁇ ⁇ 90 °, in particular ⁇ ⁇ 85 °, and in particular ⁇ ⁇ 80 °.
  • the grinding tool 1 ' is arranged relative to the bath with filling resin 25 such that the grinding fins 8 closest to the filling resin 25 are immersed therein, but not the supporting body 2 connected to the grinding fins 8.
  • the grinding tool 1' becomes around the central axis 7, preferably rotated in the direction of rotation 10, so that the grinding blades 8 several times in succession dip into the bath and dive out of the bathroom again.
  • the filling resin 25 penetrates substantially into the respective base 16. In contrast, the filling resin 25 drips substantially again from the respective abrasive layer 17, so that the abrasive grains 22 are not covered by the filling resin 25.
  • the grinding blades 8 After providing the grinding blades 8 with the filling resin 25, this is cured.
  • the curing is preferably carried out by the supply of heat, for example by means of a furnace.
  • the grinding tool 1 according to the invention is produced or completed.
  • the cured filling resin 25 By the cured filling resin 25, the grinding blades 8 have an increased rigidity.
  • Fig. 4 shows a section through a grinding blade 8 of an unfinished grinding tool 1 'in 50-times microscopic magnification
  • Fig. 5 shows a section through a stiffened grinding blade 8 of a grinding tool 1 according to the invention in 50-times microscopic magnification.
  • the filling resin 25 can be selected, for example, from the group of thermosets, elastomers, synthetic resins and / or thermoplastics and combinations thereof.
  • the filling resin 25 is a synthetic resin, preferably a phenolic resin.
  • the cured filling resin 25 should below a limit temperature, for example of 70 ° C, no softening behavior demonstrate.
  • the strength to room temperature strength for example, at 20 ° C, should not be reduced by more than 10%.
  • the properties of plastics for example the behavior of the modulus of elasticity, as a function of the temperature are known in principle (cf. Peter Eyerer, Thomas Hirth, Peter Elsner: Polymer Engineering, Springer-Verlag, 2008, pages 4 and 5 ).
  • FIG. 6 the use of the grinding tool 1 according to the invention is illustrated.
  • a workpiece 28 having a width b is to be processed by means of the grinding tool 1.
  • the grinding blades 8 located within an engagement region E are in grinding engagement with the workpiece 28.
  • the engagement region E is defined by an engagement angle ⁇ .
  • the pressure angle ⁇ is dependent on the width b of the workpiece 28.
  • the trailing edges 11 of the grinding blades 8 are deflected cyclically in the negative and positive directions due to the grinding engagement.
  • the zero position A 0 denotes the position of the trailing edges 11 of the grinding blades 8 in the rotating state of the grinding tool 1 without contact with the workpiece 28.
  • the zero position A 0 is thus dependent on the rotational speed of the rotating grinding tool 1 to the central axis 7 and the outer diameter D.
  • deflection A as a function of a rotation angle ⁇ describes the deflection of the trailing edge 11 of the respective grinding blade 8 perpendicular to the machined workpiece surface.
  • the grinding blades 8 are bent when passing the workpiece 28 in the negative direction, ie in the direction of the support body 2, according to their angular position.
  • the deflection already sets in front of the edge of the Workpiece 28 at the angular position A, since the deflection of the leading grinding blades 8 transmits by touching the trailing grinding blades 8.
  • the deflection in the negative direction is maximum. This is marked with A max .
  • the maximum deflection A max and the deflection A F during the overshoot are dependent on the rigidity of the grinding blades 8 and their load due to the machining of the workpiece 28.
  • the loading of the grinding blades 8 is dependent on the angle at which the grinding tool 1 opposite the workpiece surface to be machined is inclined, the width b of the workpiece 28, the number of simultaneously in loop engagement grinding blades 8, the contact pressure of the grinding tool 1, so the force with which the grinding blades 8 are pressed in the grinding process perpendicular to the workpiece surface, the Speed and the outer diameter D of the grinding tool 1.
  • the load is greater, the greater the inclination, the contact pressure, the speed and the outer diameter and the smaller the width b of the workpiece 28.
  • the filling resin 25 has a strength-enhancing filler 29 and / or a grinding-active filler 30.
  • the strength-enhancing filler 29 is located in and / or on the base 16.
  • the strength-enhancing filler 29 is, for example, chalk or aluminum oxide.
  • the strength-enhancing filler 29 is mixed in the bath with filling resin 25 so that the pad 16 according to the previous embodiment and as with reference to Fig. 3 described, is provided with the filling resin 25 and additionally with the strength-enhancing filler 29.
  • the abrasive filler 30 is mixed alternatively or additionally in the filling resin 25.
  • the abrasive filler 30 is, for example, cryolite and potassium tetrafluoroborate.
  • the filling resin 25 preferably includes the strength-enhancing filler 29 and the abrasive filler 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP15753683.0A 2015-08-21 2015-08-21 Schleif-werkzeug sowie verfahren zur herstellung eines derartigen schleif-werkzeugs Active EP3337643B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15753683T PL3337643T3 (pl) 2015-08-21 2015-08-21 Narzędzie szlifierskie oraz sposób wytwarzania tego rodzaju narzędzia szlifierskiego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/069267 WO2017032396A1 (de) 2015-08-21 2015-08-21 Schleif-werkzeug sowie verfahren zur herstellung eines derartigen schleif-werkzeugs

Publications (2)

Publication Number Publication Date
EP3337643A1 EP3337643A1 (de) 2018-06-27
EP3337643B1 true EP3337643B1 (de) 2019-06-26

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EP15753683.0A Active EP3337643B1 (de) 2015-08-21 2015-08-21 Schleif-werkzeug sowie verfahren zur herstellung eines derartigen schleif-werkzeugs

Country Status (15)

Country Link
US (1) US11273535B2 (es)
EP (1) EP3337643B1 (es)
JP (1) JP6684895B2 (es)
KR (1) KR102340572B1 (es)
CN (1) CN107921610A (es)
AU (1) AU2015407196B2 (es)
BR (1) BR112018003397B1 (es)
CA (1) CA2995886C (es)
ES (1) ES2742151T3 (es)
IL (1) IL257184B (es)
MX (1) MX2018001646A (es)
PL (1) PL3337643T3 (es)
RU (1) RU2689834C9 (es)
WO (1) WO2017032396A1 (es)
ZA (1) ZA201801163B (es)

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CN114211411B (zh) * 2021-12-28 2022-09-13 江苏华东砂轮有限公司 一种大尺寸单晶硅片超精密加工抛光砂轮及其制备方法

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Also Published As

Publication number Publication date
US11273535B2 (en) 2022-03-15
ZA201801163B (en) 2021-08-25
RU2689834C9 (ru) 2019-09-11
KR20180042290A (ko) 2018-04-25
CA2995886C (en) 2022-03-01
BR112018003397A2 (pt) 2018-09-25
EP3337643A1 (de) 2018-06-27
AU2015407196B2 (en) 2021-11-04
WO2017032396A1 (de) 2017-03-02
US20180243885A1 (en) 2018-08-30
US20200047315A2 (en) 2020-02-13
RU2689834C1 (ru) 2019-05-29
KR102340572B1 (ko) 2021-12-17
BR112018003397B1 (pt) 2021-06-01
IL257184B (en) 2021-05-31
JP6684895B2 (ja) 2020-04-22
AU2015407196A1 (en) 2018-03-22
CA2995886A1 (en) 2017-03-02
IL257184A (en) 2018-03-29
PL3337643T3 (pl) 2019-12-31
ES2742151T3 (es) 2020-02-13
MX2018001646A (es) 2018-09-06
JP2018528866A (ja) 2018-10-04
CN107921610A (zh) 2018-04-17

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