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
  • 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

Definitions

• the invention relates to a flap disc according to the preamble of claim 1.
• a flap disc in which along the circumferential zone of a circular disk-shaped flexible base plate in radial slots of the circumferential zone, grinding flaps are arranged to overlap one another in the manner of roof tiles and are permanently attached. In order to make the base plate lighter and simpler and still hold the grinding flaps safely at higher speeds, this is
• Base plate designed as a partial disk, in the circumferential zone of which there are radial slots which are widened to form gill-like openings in which sliding disks are clamped.
• a flap disc is known, in which along the circumferential zone of a circular disk-shaped flexible base plate, grinding flaps are arranged to overlap one another like roof tiles, are pushed through radial slots in the circumferential zone and are clamped on the back by a clamping plate.
• the base plate and the clamping plate are designed as sheet metal disks and are connected to one another on the outer circumference in a non-positive or positive manner. This design is intended to enable the flap disc to be handled as a one-piece tool after manufacture, during the Transports and by the user.
• DE-GM 88 04 148.4 describes a flap disc, which consists of a metallic backing plate, on which flap discs that form an outer ring are glued. The the
• DE 38 39 238 discloses a flap disc with a base plate, in which grinding flaps are glued over a roof tile in an overlapping manner on an outer ring.
• the base plate is preferably designed as a metal disc in which there are openings which are preferably round. These holes are used for the adhesive to flow through to the back.
• a counterbore on the back of the plate increases the hold of the adhesive.
• the plate has several notches in the clamping area, which ensure self-locking against loosening of the nut when tightening. This training is intended to create a base plate which ensures high operational reliability with simple manufacture.
• a flap grinding tool which has a support plate which is provided with a fastening means for mounting on a drive machine, and with a grinding wheel which has a circular disk-shaped carrier, releasably attachable to the support plate, and abrasives arranged thereon.
• the carrier consists of a flexible fabric.
• the connecting means between the carrier and the support plate is a self-adhesive, detachable, large-area surface fastener. Radially aligned, fan-like overlapping grinding flaps are glued to the carrier.
• the outer diameter of the carrier and the arranged grinding flaps is larger than the outside diameter of a backing plate which is selected depending on the progressive degree of wear of the grinding flaps and whose diameter is adapted to the respective degree of wear and which is provided with a central pin on the grinding wheel side for a central perforation in the carrier.
• This design is intended to ensure that the abrasive can be used as completely as possible when grinding in corner areas.
• a flap disc for hand-held grinding machines consisting of a round carrier disc with a centrally arranged device for attachment to a hand-held grinding machine and fan-like overlapping grinding plates attached to the carrier disc, which extend to the outer edge of the carrier disc or protrude beyond this.
• the surfaces of the grinding flaps serve as a grinding surface.
• the radially outer narrow sides of the grinding flaps form the circumference of the flap disc.
• At least the narrow sides of the grinding lamellae are provided with a hardening binding agent, which removes material from the object to be processed and extends to the grinding surface.
• a base bond layer is applied to a base
• a layer of abrasive grain is applied to it
• a first cover bond is applied to the abrasive grain layer
• a second cover bond is applied to the first cover bond in a very complex manner.
• the first cover bond is intended to ensure the strength of the abrasive grain layer and can additionally contain abrasive substances such as KBF, cryolite or the like. sen.
• the second cover layer has grinding-active substances that are important for the grinding effect of the flap disc.
• the object of the present invention is to design a flap disc of the type mentioned at the outset in such a way that the grinding effect is improved with reduced material and manufacturing costs.
• the invention proposes to use two different types of lamellae for the lamellae of the flap disc, namely first lamellae, consisting of a base, a base bond layer applied thereon and a spreading layer of abrasive grain applied to the base bond layer and a cover layer applied to the grinding grain layer , and on the other second slats, consisting of a base and only one layer applied to the base with abrasive substances.
• every second, third, fourth, etc. slat can be designed in the manner of the first slats or in the manner of the second slats, and the other slats can be designed in the manner of the second slats or first slats.
• Groups of first slats and groups of second slats can also alternate, the number of slats in the groups being the same or different.
• the design according to the invention has the advantage that the lamellae are easier and cheaper to manufacture overall, which makes the flap disc overall less expensive.
• Fig. 2 shows a first lamella used in the flap disc of Fig. 1 in section
• Fig. 1 used second slat in section.
• FIG. 1 shows a flap disc 2 with a carrier plate 4, which has a central through-hole 6 for fastening the flap disc to a machine.
• a carrier plate 4 which has a central through-hole 6 for fastening the flap disc to a machine.
• the lamellae 10 have radially outer sides 11, which end with the edge of the carrier plate or protrude beyond it and which can be straight or curved.
• the lamellae 10 consist of two types of lamellae, first lamellae 12, consisting of a base 14, a base binding layer 15 applied thereon, a scattering layer of abrasive grain 16 applied to the base binding layer 15 and a cover layer 18 applied to the grinding grain scattering layer 16, and second lamellae 20, consisting of a base 22 and a layer 24 with abrasive substances applied to the base, cf. 2 and 3.
• the abrasive grain 16 is partially in the
• Basic bond layer 15 is embedded and the cover layer 18 is selected only so strongly that the abrasive grain protrudes with its tips from the cover layer, cf. Fig. 2.
• the cover layer 18 of the first lamellae 12 can additionally be provided with abrasive substances.
• grinding active substances for example
• Example 1 On a carrier disc of 115 mm
• the grinding lamellae consisted of a base made of equipped polyester fabric with a base bond layer, in which zirconium corundum in grain size 40 was sprinkled in an amount of 700 g / m, a first cover bond applied to the grinding grain layer with an application of 300 g / m, which ensures the strength of the abrasive grain layer, and a second cover bond with an abrasive substance (potassium fluoroborate), which supports the grinding process, and j which was applied with a binder in an amount of 380 g / m.
• This flap disc was tested on a machine with a speed of 4,200 rpm, which has a cutting speed of 25 m / sec. equivalent.
• Round pipes made of V2A 4301 with an outside diameter of 90 mm and a wall thickness of 10 mm were ground. 153 g of material were machined in 10 intervals of 5 minutes each.
• Example 2 Grinding lamellae according to Example 1 were glued to the carrier disk, the following lamellae being used alternately.
• the 1st, 3rd, 5th etc. consisted of material as in Example 1, but without a second cover binding.
• the 2nd, 4th, 6th, etc. lamella consisted of a base to which only one layer was applied, which contained potassium fluoroborate as an abrasive substance and was applied with a binder in an amount of 480 g / m 2. 373 g of material were machined under the same conditions as in Example 1.
• Example 3 In accordance with Example 2, a flap disc was produced, which, however, contained the grinding flaps according to Example 1 without a second cover bond and flaps from a base with only one active grinding coating in a ratio of 1: 2, ie the disc only had 1/3 of the amount of abrasive grain from Example 1. This disc was used under the same conditions as in Example 1 353 g of material machining.
• Example 4 A flap disc was produced according to Example 2, in which the grinding active substance potassium fluoroborate was replaced by cryolite. This disk was used to cut 394 g of material under the same conditions as in Example 1.
• Example 5 A flap disc was produced according to Example 1, sintered corundum of the same grain size being used as the abrasive grain instead of zirconium corundum. This disk was used to cut 201 g of material under the same conditions as in Example 1.
• Example 6 A flap disc according to Example 4 was produced with sintered corundum instead of zirconium round. 370 g of material were machined with this disk under the same conditions as in Example 1.
• Example 7 A flap disc in accordance with Example 6 was produced with lamellae which contained calcium carbonate instead of cryolite as the active grinding material. This disc was used to cut 203 g of material under the same conditions as in Example 1. In Examples 5-7, the weight loss of the discs after grinding was approximately the same.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Packaging For Recording Disks (AREA)
• Polysaccharides And Polysaccharide Derivatives (AREA)
• Mechanical Treatment Of Semiconductor (AREA)
• Massaging Devices (AREA)
• Led Device Packages (AREA)
• Grinding Of Cylindrical And Plane Surfaces (AREA)
• Surgical Instruments (AREA)

Priority Applications (10)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (4)

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Citations (2)

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• 1998
  • 1998-11-20 DE DE19853550A patent/DE19853550C1/de not_active Expired - Fee Related
• 1999
  • 1999-11-05 CA CA002350060A patent/CA2350060C/en not_active Expired - Fee Related
  • 1999-11-05 EP EP99958000A patent/EP1131187B1/de not_active Expired - Lifetime
  • 1999-11-05 TR TR2001/01380T patent/TR200101380T2/xx unknown
  • 1999-11-05 CN CN99812671A patent/CN1131129C/zh not_active Expired - Fee Related
  • 1999-11-05 PT PT99958000T patent/PT1131187E/pt unknown
  • 1999-11-05 SK SK592-2001A patent/SK5922001A3/sk unknown
  • 1999-11-05 DK DK99958000T patent/DK1131187T3/da active
  • 1999-11-05 DE DE59902492T patent/DE59902492D1/de not_active Expired - Lifetime
  • 1999-11-05 HU HU0104239A patent/HU227803B1/hu not_active IP Right Cessation
  • 1999-11-05 WO PCT/EP1999/008494 patent/WO2000030809A1/de not_active Ceased
  • 1999-11-05 US US09/856,126 patent/US6582289B1/en not_active Expired - Lifetime
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  • 1999-11-05 AU AU15516/00A patent/AU756920B2/en not_active Ceased
  • 1999-11-05 ES ES99958000T patent/ES2183627T3/es not_active Expired - Lifetime
  • 1999-11-05 RU RU2001116721/02A patent/RU2205102C2/ru not_active IP Right Cessation
  • 1999-11-05 AT AT99958000T patent/ATE222836T1/de active
• 2001
  • 2001-04-23 ZA ZA200103288A patent/ZA200103288B/xx unknown

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