EP3651936A1 - Meule en éventail pour meuleuse d'angle - Google Patents

Meule en éventail pour meuleuse d'angle

Info

Publication number
EP3651936A1
EP3651936A1 EP18742902.2A EP18742902A EP3651936A1 EP 3651936 A1 EP3651936 A1 EP 3651936A1 EP 18742902 A EP18742902 A EP 18742902A EP 3651936 A1 EP3651936 A1 EP 3651936A1
Authority
EP
European Patent Office
Prior art keywords
grinding
carrier
abrasive
ring diameter
trapezoidal side
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.)
Granted
Application number
EP18742902.2A
Other languages
German (de)
English (en)
Other versions
EP3651936B1 (fr
Inventor
Adolf Lang
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.)
Tyrolit-Schleifmittelwerke Swarovski KG
Original Assignee
Tyrolit-Schleifmittelwerke Swarovski 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 Tyrolit-Schleifmittelwerke Swarovski KG filed Critical Tyrolit-Schleifmittelwerke Swarovski KG
Priority to PL18742902T priority Critical patent/PL3651936T3/pl
Publication of EP3651936A1 publication Critical patent/EP3651936A1/fr
Application granted granted Critical
Publication of EP3651936B1 publication Critical patent/EP3651936B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
    • 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
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0045—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by stacking sheets of abrasive material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0072—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing

Definitions

  • the invention relates to a flap disc for an angle grinder, comprising a substantially rotationally symmetrical carrier and grinding lamellae which are arranged overlapping each other on the carrier, wherein the grinding lamellae each have a shape of a trapezoid having a first trapezoidal side and a second trapezoidal side parallel thereto, and wherein Length of the first side of the trapezoid is less than the length of the second side of the trapezoid.
  • the invention further relates to a method for producing such a flap disc.
  • Flap discs are known per se from the prior art. They are used on angle grinders for grinding and processing of various surfaces.
  • the flap discs usually comprise a carrier, on which abrasive flaps are arranged.
  • the grinding lamellae are also referred to as "flaps.”
  • Figures 1 a and 1 b show a flap wheel 101 according to the prior art, wherein Figure 1 a shows a plan view from above and Figure 1 b shows a perspective view obliquely from above Flap disc 101 comprises a carrier 102 on which abrasive flaps 103 are arranged overlapping each other.
  • the grinding blades 103 have a rectangular shape. At the inner edge 130, the grinding lamellae are positioned closest to one another, the packing density decreasing in the radial direction. As a result, the distance 1 14 adjacent grinding blades 103 decreases from the outer edge. As a result, gaps 131 form between adjacent grinding lamellae 103. These gaps 131 adversely affect the life of the flapper disk 101, since the mobility of the grinding lamellae 103 due to the gaps 131 in the grinding insert leads to additional mechanical loading and vibration of the grinding lamellae 103 and more follow the wear of the grinding blades 103 force.
  • DE 20 2006 020 390 U1 shows a flap disc with triangular grinding blades.
  • DE 295 10 727 U1 discloses a flap disc with trapezoidal grinding blades. In DE 295 10 727 U1 itself no position is taken for this purpose.
  • the object of the present invention is to provide a comparison with the prior art improved flapper wheel, in which the above-described problems are substantially eliminated and which, in particular in the outdoor area has no significant gap between adjacent grinding blades.
  • Another object of the invention is to provide a method of manufacturing such a fluted flapper disk thus improved.
  • the carrier has a circular ring with an inner ring diameter and an outer ring diameter, the grinding lamellae are arranged on the annulus, the first trapezoidal side of the grinding lamella each at the inner ring diameter and the second trapezoidal side of the grinding lamellae on outer ring diameter, and wherein the ratio of the length of the second trapezoidal side to the length of the first trapezoidal side is substantially equal to the ratio of outer ring diameter to inner ring diameter.
  • the ratio of the length of the second trapezoidal side to the length of the first trapezoidal side is substantially equal to the ratio of outer ring diameter to inner ring diameter, the diameter-increasing gap formation is compensated.
  • the shape, d. H. the ratio of the second trapezoidal side (broad side) to the first trapezoidal side (narrow side) thus corresponds according to the invention to the diameter increase between the inner ring diameter and the outer ring diameter. It is irrelevant whether it is a trapezoid in general or an isosceles or a right-angled trapeze in particular.
  • Another advantage is that due to wear a larger mass of the flap material can be used up, as more Flap mass is available at the outer ring diameter.
  • the ratio of the length of the second trapezoidal side to the length of the first trapezium side and the ratio of outer ring diameter to inner ring diameter > 1, 2 and ⁇ 2.5, preferably> 1, 5 and ⁇ 2.0.
  • the flapper wheel according to the invention it is possible to arrange the abrasive flaps such that the distance between two adjacent abrasive flaps at the inner ring diameter is substantially equal to the distance at the outer ring diameter. This also has an advantageous effect on the grinding properties of the flap disc.
  • the abrasive lamellae each have a textile backing on which abrasive grains are attached using at least one binder, and / or that the carrier as a glass fiber reinforced plastic carrier, as a plastic carrier, as a natural fiber carrier or as Steel carrier is formed.
  • the binder can be synthetic resins.
  • a textile backing is cotton, polyester or mixed textiles from both fibers.
  • the abrasive grains for example, normal corundum or Zirkonkorunde with a grain size of 24-120 mesh, or even SiC
  • the order of a thin bonding layer of resin for example, phenolic resin takes place.
  • a capping agent which can contain, for example, fillers in addition to resin, can then take place.
  • a strong filler-containing bonding layer which is also referred to as top-size, takes place.
  • the glass-fiber-reinforced plastic carrier (GfK carrier) can be carried out by a layered structure and pressing of pre-impregnated with phenolic resin fiber fabrics, which are cured in the oven.
  • the carrier is designed as a plastic carrier, then it is advisable to injection-mold the carrier made of thermoplastic, wherein, for example, glass-fiber-reinforced polyamide or ABS can be used.
  • Special variants are natural fiber carriers, which can be used as reinforcement for example hemp.
  • the carrier can also be designed as a steel carrier, preferably being extruded or stamped thin steel carriers.
  • the essentially rotationally symmetrical carrier is provided in a first method step, an adhesive, preferably an adhesive, is applied to the carrier in a second method step between the inner ring diameter and the outer ring diameter, and in a third Process step, the grinding lamellae arranged on the support such that the grinding lamella overlap each other and the first trapezoidal side of the grinding lamellae respectively at the inner ring diameter and the second trapezoidal side of the grinding lamellae is arranged in each case on the outer ring diameter.
  • an adhesive preferably an adhesive
  • the grinding lamellae In the course of the third method step, it has proven to be advantageous to place the grinding lamellae successively on the support with a third trapezoid side which connects the first trapezoid side and the second trapezoid side, wherein two adjacent grinding lamellae have a predetermined setting distance relative to one another, and the abrasive flaps are then tilted in the direction of the carrier.
  • the tilting of the grinding lamellae takes place in two stages, wherein the grinding lamellae are slightly tilted in a first step to specify a pressing direction, and wherein the grinding lamellae are pressed in a second step in the pressing direction onto the circular ring of the carrier.
  • the predetermined setting distance can be achieved, for example, by a rotation of the carrier.
  • FIG. 2 schematically shows a manufacturing method according to the prior art. It is one half of a carrier 102 indicated in cross section, wherein the Carrier has a tilted shape. Instead, a straight beam can also be used.
  • the axis of rotation 1 13 is indicated by a dash-dotted line.
  • a transport device 127 which comprises a transport roller which is rotatably mounted about a rotation axis 129, an abrasive belt 1 19 is supplied. From this abrasive belt 120 rectangular abrasive slats 103 are separated along separation lines 128 and placed on the support 102 by means of a punching device.
  • the grinding lamellae which are arranged in the course of the third method step on the support, are separated by a serrated abrasive belt, preferably by means of a punching device, wherein the serrated shape results from a sequential arrangement of the trapezoidal shape of the abrasive slats, preferably wherein the abrasive slats on the first trapezoidal side or on the second trapezoidal side are separated from the abrasive belt.
  • the flap disc has a rotation axis and the serrated abrasive belt is advanced in a feed direction in the direction of the carrier, the feed direction forms an angle to the axis of rotation, and the angle is selected such that a third trapezoidal side of the grinding blades, which connects first trapezoidal side and the second trapezoidal side, is aligned substantially parallel to a setting surface of the carrier. It is advantageous in this Connection that the angle is variable to process different trapezoidal shapes, and / or that the angle is substantially 90 °.
  • a stop ring may be used which is positioned on the carrier and against which abuts the end of the serrated abrasive belt, and / or a feed device is used, which advances the serrated abrasive belt by the feed path.
  • the serrated abrasive belt may be severed from a sanding roll, the sanding roll having a width which is a multiple of the maximum width of the serrated sanding belt, preferably wherein at least two serrated sanding belts are severed from the sanding belt and the at least two serrated sanding belts are rotated 180 degrees from one another are.
  • the material of the grinding roller can be exploited almost without waste.
  • FIG. 1 shows a flap grinding wheel according to the prior art in a plan view from above
  • FIG. 4a shows a flap disc according to a fourth preferred embodiment
  • Fig. 5a is a schematic representation of an inventive
  • Fig. 5b is a schematic representation of the invention
  • Fig. 6a is a schematic representation of an inventive
  • Fig. 6b is a schematic representation of the invention
  • FIG. 7 shows a preferred procedure for the production of the serrated abrasive belt in a schematic representation.
  • Figures 1 a, 1 b and 2 which show the state of the art, have already been described above.
  • FIGS. 3a, 3b and 3c show preferred embodiments of a flap disc according to the invention, wherein in each case only two grinding blades 3 are shown.
  • the flap disc has a substantially rotationally symmetrical carrier 2 and grinding blades 3, which are arranged overlapping one another on the carrier 2.
  • the grinding blades 3 each have a shape of a trapezoid with a first trapezoid side 4 and a second trapezoid side 5 parallel thereto, the length 6 of the first trapezoid side 4 being smaller than the length 7 of the second trapezoid side 5.
  • the two sides of the trapezoid 4 and 5 are connected by two more trapezoidal side 17 and 31 with each other.
  • the carrier 2 has a circular ring 9 with an inner ring diameter 10 and an outer ring diameter 1 1.
  • the grinding lamellae 3 are arranged on the circular ring 9, wherein the first trapezoid side 4 of the grinding lamellae 3 is arranged in each case on the inner ring diameter 10 and the second trapezoid side 5 of the grinding lamellae 3 respectively on the outer ring diameter 1 1.
  • the grinding blades 3 may protrude slightly beyond the circular ring 9 or the carrier 2.
  • the carrier 2 further comprises a central bore 8, through the center 30 of which runs the axis of rotation of the flap disc.
  • the bore 8 serves to connect the flap disc to a rotary drive of an angle grinder.
  • the embodiments differ in that the grinding blades 3 in the case of Figure 3a generally have the shape of a trapezium, in the case of Figure 3b have the special shape of an isosceles trapezium and in the case of Figure 3c have the special shape of a rectangular trapezium.
  • the shape of the trapezoid does not matter. It is essential that the ratio of the length 7 of the second trapezoid side 5 to the length 6 of the first trapezoid side 4 is substantially equal to the ratio of outer ring diameter 1 1 to inner ring diameter 10.
  • FIGS. 4a and 4b show a further exemplary embodiment of the flapper wheel 1 according to the invention.
  • FIG. 4b shows that the grinding surface 12 formed from the overlapping abrasive flaps 3, which can be brought into contact with a workpiece to be machined, is substantially flat , and the axis of rotation 13 is aligned substantially normal to the grinding surface 12.
  • the distance between two adjacent grinding blades 3 on the outer ring diameter 1 1 is provided with the reference numeral 14. This distance is substantially equal to the distance between two adjacent grinding blades 3 on the inner ring diameter 10th
  • FIGS. 5a and 5b show a first preferred embodiment of the method according to the invention for producing a flap disc.
  • the essentially rotationally symmetrical carrier 2 is provided in a first method step.
  • it is an inclined carrier 2, in which the outer region of the carrier with respect to the rotational axis 13 is inclined and drops. But it can also just as well a carrier 2 are used, which is currently formed.
  • the feed device 27 and punching device 20 described below can be rotated relative to the carrier 2. This is indicated by the arrow 32.
  • the rotation of the feed device 27 and the punching device 20 relative to the carrier 2 also serves to be able to set grinding blades with different Trapezwinkeln.
  • the serrated abrasive belt 19 is advanced in a feed direction 34 in the direction of the carrier 2, wherein the feed direction 34 forms an angle 35 to the rotation axis 13, and the angle 35 is selected such that the third trapezoid side 17 of the grinding blades 3, which first trapezoidal side 4 and the second trapezoidal side 5 connects, is aligned substantially parallel to a setting surface 36 of the carrier 2.
  • a second method step is between the inner ring diameter 10 and the outer ring diameter 1 1, d. H. in the circular ring 9, an adhesive applied to the carrier 2.
  • the grinding lamellae 3 are arranged on the carrier 2 in such a way that the grinding lamellae 3 overlap one another and the first trapezoid side 4 of the grinding lamellae 3 at the inner ring diameter 10 and the second trapezoid side 5 of the grinding lamellae 3 respectively at the outer ring diameter 1 1 is arranged.
  • the grinding blades 3 are in the course of the third step initially with a third side of the trapezoid 17, which the first side of the trapezium 4 and the second trapezoidal side 5 connects, mounted on the carrier 2, wherein two adjacent grinding blades 3 have a predetermined setting distance 18 relative to each other.
  • the grinding blades 3 are separated on the second trapezium side 5 in the case shown.
  • a grinding lamella 3 is positioned on the carrier 2.
  • a grinding lamella 3 is separated from the serrated grinding belt 19, namely along a parting line 28, which corresponds to a part of the second trapezoid side 5 of the abradable grinding lamella 3.
  • the carrier 2 and the serrated abrasive belt 19 are rotated relative to each other by a predetermined angle 24 to achieve the predetermined setting distance 18 of two adjacent grinding blades 3 (see Figure 5b).
  • the three sub-steps are repeated until the carrier 2 is equipped with the predetermined number of grinding blades 3.
  • the loading time for all grinding blades 3 is less than 3 seconds.
  • the grinding lamellae 3 are tilted in the direction of the carrier 2.
  • the tilting of the grinding blades 3 takes place in two stages, wherein the grinding blades 3 are slightly tilted in a first stage to specify a pressing direction, and wherein the grinding blades 3 are pressed in a second stage in the pressing direction on the circular ring 9 of the carrier 2.
  • a pressure bell is used for example.
  • an advancing device 27 is provided in the form of one or more transport rollers which rotate about one Rotary axis 29 are rotatable, for use. This feed device 27 advances the serrated abrasive belt 19 by the feed path 25, respectively.
  • a stop ring 26 can be used which is positioned on the carrier 2 and against which the end 23 of the serrated grinding belt 19 abuts. This embodiment of the method according to the invention is shown in FIGS. 6a and 6b.
  • the serrated abrasive belt 19 is advanced substantially transversely to the axis of rotation 13 in the direction of the carrier 2.
  • the serrated abrasive belt 19 is separated from a sanding roller 21, the sanding roller 21 having a width 22 which is a multiple of the maximum width 7 (see, for example, FIG FIG. 5a), wherein two adjacent serrated abrasive belts 19 are rotated relative to each other by 180 °. In this way, the abrasive belts 19 can be cut out of the grinding roller 21 almost without wastage. Only the outer edge strips 33 must be disposed of as waste.
  • the serrated abrasive belts 19 are preferably annular knife with the desired serrated shape used.
  • the separation of the bands can also be done by means of laser radiation or the like.
  • the separated belts are rolled up and can now be fed to the setting and punching process for filling a carrier body with grinding lamellae.

Landscapes

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

Abstract

L'invention concerne une meule en éventail (1) pour une meuleuse d'angle. La meule en éventail comporte un support (2) sensiblement à symétrie de rotation et des lamelles de meulage (3), lesquelles se chevauchent sur le support (2). Les lamelles de meulage (3) présentent chacune la forme d'un trapèze pourvu d'une première face (4) et d'une deuxième face (5) parallèle à celle-ci, et la longueur (6) de la première face (4) du trapèze est inférieure à la longueur (7) de la deuxième face (5) du trapèze. Le support (2) présente un anneau (9) pourvu d'un diamètre intérieur (10) et d'un diamètre extérieur (11), les lamelles de meulage (3) étant agencées sur l'anneau (9). La première face (4) de trapèze des lamelles de meulage (3) est agencée respectivement sur le diamètre intérieur (10) de l'anneau et la deuxième face (5) de trapèze des lamelles de meulage (3) est agencée respectivement sur le diamètre extérieur (11) de l'anneau, et le rapport de la longueur (7) de la deuxième face (5) de trapèze sur la longueur (6) de la première face (4) de trapèze est sensiblement identique au rapport du diamètre extérieur (11) de l'anneau sur le diamètre intérieur (10) de l'anneau.
EP18742902.2A 2017-07-11 2018-07-05 Meule en éventail pour meuleuse d'angle Active EP3651936B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18742902T PL3651936T3 (pl) 2017-07-11 2018-07-05 Wachlarzowa tarcza szlifierska do szlifierki kątowej

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50573/2017A AT520116B1 (de) 2017-07-11 2017-07-11 Fächerschleifscheibe für einen Winkelschleifer
PCT/AT2018/060135 WO2019010508A1 (fr) 2017-07-11 2018-07-05 Meule en éventail pour meuleuse d'angle

Publications (2)

Publication Number Publication Date
EP3651936A1 true EP3651936A1 (fr) 2020-05-20
EP3651936B1 EP3651936B1 (fr) 2020-11-04

Family

ID=62975775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18742902.2A Active EP3651936B1 (fr) 2017-07-11 2018-07-05 Meule en éventail pour meuleuse d'angle

Country Status (5)

Country Link
EP (1) EP3651936B1 (fr)
AT (1) AT520116B1 (fr)
ES (1) ES2849563T3 (fr)
PL (1) PL3651936T3 (fr)
WO (1) WO2019010508A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3148281A1 (fr) * 2019-08-19 2021-02-25 Diamabrush Llc Appareil de polissage de sol

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2907147A (en) * 1957-12-23 1959-10-06 F L & J C Codman Company Radial face rotary buffing element
DE29510727U1 (de) * 1995-01-24 1995-08-31 Lukas Erzett Schleif Fraes Werkzeug, insbesondere Schleif- oder Polierteller
DE202010008898U1 (de) * 2010-10-26 2010-12-30 Lukas-Erzett Vereinigte Schleif- Und Fräswerkzeugfabriken Gmbh & Co. Kg Schleiflamelle zum Anordnen auf einer um eine Drehachse rotierend antreibbaren Schleifscheibe
DE102011100792A1 (de) * 2011-05-06 2012-11-08 Rhodius Schleifwerkzeuge Gmbh & Co. Kg Flexible Schleifscheibe

Also Published As

Publication number Publication date
EP3651936B1 (fr) 2020-11-04
WO2019010508A1 (fr) 2019-01-17
ES2849563T3 (es) 2021-08-19
AT520116B1 (de) 2022-10-15
AT520116A1 (de) 2019-01-15
PL3651936T3 (pl) 2021-06-14

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