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
  • B24D13/06—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
  • B24D13/02—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

Definitions

• Machine for surface treatment such as grinding or polishing
• the invention relates to a machine for surface treatment, such as grinding or polishing of workpieces and comprising a rotating cylinder having a number of treatment modules that extend outwards and away from the cylinder face and comprising at least one piece of grinding cloth.
• Such machine is known ia from WO 2004/103643 describing a grinding apparatus with rotating grinding and brush modules comprising an elongate body part, at least one grinding cloth protruding from the body part, and a plurality of bristles that protrude from the body part in essentially the same direction as the grinding cloth.
• hold-back means comprise elastic lamellae or brushes that are embedded in proximity of the cylinder face, from where they extend to a respective grinding cloth in directions that - seen in the direction of rotation - are situated in front of an axial plane through the embedding of the hold-back means at the cylinder face.
• the hold-back means are bristles that extend outwards and forwards relative to the direction of rotation on the rotating brush.
• the hold-back means eg the bristles
• the hold-back means will support the grinding cloth to the effect that it is pulled up above a side edge of the body, while simultaneously the hold-back means are pressed rearwards relative to the direction of rotation.
• the surface treatment of the horizontal surface of the workpiece continues as described in WO 2004/103643.
• the grinding cloth extends a small expanse, radially further than the hold-back means, such as the bristles.
• the hold-back means need not be bristles, but may also be several pieces of grinding cloth, or they may be nylon brushes that have embedded grinding grains. Albeit, in the following, the hold-back means will be designated bristles, they may thus very well be configured in other ways. According to a particularly preferred embodiment, the bristles extend at an angle of between 10°-60°, an more advantageously at an angle of between 25°-45° relative to the radius of the grinding brush when the brush module is mounted on the cylinder.
• the brush module comprises a longitudinally extending guide that extends from the upper side of the brush module and extends into the brush module and is configured for receiving a grinding element that protrudes from the body part, where the body part and the grinding element are provided with complementary, mechanical interconnection means, whereby the grinding element is releasably mounted on the body part.
• the grinding cloth can be mounted on the body part of the brush module by being, in a simple manner, shifted axially into the groove. Simultaneously this construction ensures that the grinding cloth is not swung out of the brush module when it is mounted on a grinding brush that rotates.
• the brush module comprises a longitudinally extending groove that extends centrally on the upper side of the brush module and extends into the brush module and is configured for receiving the plurality of brushes, where the brushes and the body part are provided with complementary, mechanical interconnection means to the effect that the grinding element is releasably mounted on the body part.
• the brushes can be changed and further that it is an option to provide brushes secured to a fitting with a bead which is complementary with the longitudinally extending groove to the effect that the mounted brushes, when mounted in the brush module, extends at an angle relative to the radius of the grinding brush.
• the body part is configured with one or more rows of brushes, and preferably two to four rows, that are shifted relative to each other.
• the brush module can be equipped with a plurality of brushes while simultaneously occupying a minimum of space on the brush module.
• the grinding element is, at an edge, provided with a protruding bead which is complementary with the undercut groove.
• the grinding cloth can be mounted on the body part of the brush module by shifting, in a simple manner, the bead axially into the groove.
• this construction ensures that the grinding cloth cannot be swing out of the brush module when mounted on a grinding brush that rotates.
• Figures 1-2 show the grinding process during the treatment of an end face by an embodiment of the machine according to the invention
• Figure 3 is a sketch of a further preferred embodiment of a grinding brush according to the invention in the shape of a grinding cylinder.
• Figure 4 is a sectional view of the grinding brush shown in Figure 3;
• Figure 5a shows a preferred embodiment of a brush module
• Figure 5b shows a preferred embodiment of a grinding element module
• Figure 5c shows the brush module of Figure 5a in a perspective view
• Figure 6 shows a holder means for grinding cloth in perspective view.
• Figures 1-2 shows how a surprisingly effective grinding or polishing of the end face of a workpiece is obtained.
• FIG. 1 By 1 is designated a rotating grinding or polishing cylinder 1 to whose surface a major number of grinding elements and hold-back means for the grinding elements are provided.
• Figure 1 shows a single piece of grinding cloth 2 which is supported rearwardly relative to the direction of rotation by forwardly oriented hold-back means, preferably in the shape of brushes 3.
• a larger number of brushes are provided that are elastic and serve to keep the grinding cloth 2 in abutment on the end face 4 of a workpiece 5 as will be explained below.
• the workpiece 5 is situated on a conveyor which is moved in the direction of the arrow, ie opposite the direction of rotation of the cylinder 1.
• the rate of conveyance is infinitesimally small compared to the rate of rotation of the cylinder.
• the cylinder has turned so much that the grinding layer 2 and the brushes 3 have advanced further and now they press on the end face 4 of the workpiece 5.
• the grinding layer 2 is now pulled up along the end face simultaneously with the brushes 3 being bent still further rearwards until the grinding cloth loses contact with the end face, which takes place shortly after the position shown in Figure 3.
• the grinding continues as a consequence of the workpiece being conveyed as shown in Figure 4 and in accordance with known grinding principles, eg the teachings of WO 3004/103643.
• Figure 3 shows a radial section through a preferred embodiment of a grinding cylinder 19 which is configured for being mounted transversely and horizontally relative to the direction of conveyance of the grinding machine.
• the grinding cylinder 19 of the figure is illustrated by one of the hub discs 20 that combine to form the grinding cylinder 19.
• the hub is seen inwards, from the side; it being understood that the grinding cylinder has a longitudinal direction that extends into the plane of the paper.
• the hub discs 20 are mounted against rotation on a shaft (not shown) to the effect that, when the hub discs 20 are mounted on the shaft, the hub 20 appears as a coherent unit which is, along the entire circular rim 22, provided with longitudinally extending grooves 21.
• a radius V extends towards the rim 22.
• the grooves 21 are undercut, ie they have the largest width at the bottom, closest to the centre, while being smaller at the outside of the hub 20.
• the undercut grooves 21 are intended for receiving a coupling part 17 on a brush module
• the brushes on the brush modules 10 are forwardly oriented.
• the hub could be in one piece with milled grooves for receiving the grinding and brush modules, 11 and 10, respectively.
• FIG. 4 shows a section of the hub 20, on which both the brush module 10 and the grinding element module 11 are arranged around the circular rim of the brush, alternatingly in each their groove 21.
• the grinding element module 11 comprises a body part 18 with a bottom face/top face 16 which is, in the longitudinal direction (ie into the plane of the paper), delimited by two side edges 14, 15.
• the body part 10 is provided with an undercut, longitudinally extending groove 12 for receiving a grinding element in the form of a holder means 30 with a grinding cloth 8 of a type like the one that appears from Figure 6, and extends from the holder means 30 to a free edge 8a.
• the grinding cloth 8 may be received directly in the groove 11.
• the grinding cloth 8 may have any kind of configuration, eg canvas or paper with a grinding face provided with grinding grains.
• the grinding cloth 6 comprises a grinding face 8b and is preferably sliced into thin strips as will appear from figure 8 in order to thereby provide a grinding cloth 8 which is particularly flexible for the grinding of essentially plane workpieces; it being understood that the strips make the grinding cloth particularly suitable for grinding recesses/profiles in the surface of the workpiece.
• the brush module 10 shown in figures 5a and 5c, is configured with a profile corresponding to the grinding element module.
• the brush module comprises a body part 18 with a bottom face/top face 16 which, in the longitudinal direction (ie into the plane of the paper), is delimited by two side edges 14. 15. From the bottom face, the bristles extend radially forwards relative to the direction of rotation on the rotating brush, towards a free edge 13a.
• both the brush module 10 and the grinding element module 11 are provided with a coupling part 17 that extends from the body part 18 in a direction opposite bristles 13/grinding cloth 8, and serves to secure the modules 10, 11 , the coupling part 17 being configured to fit into an axially configured keyway 21 on a hub 20 for a horizontally configured grinding cylinder (not shown).
• reference number 100 shows the same as 5 in Figure 1
• an end face 101 corresponds to the end face 4 of Figure 1.
• the free edge 8a on the grinding cloth establishes contact with the end face 101 of the workpiece as explained in the context of Figures 1 and 2, following which the grinding cloth (the grinding means) 8 is taken across the edge 103, following which the upper side 102 of the workpiece is grinded in a usual manner.
• reference numeral 7 shows one of several bores that are configured side by side in the longitudinal direction of the brush module 10 for receiving the bristles 13.
• these bristles 13 extend radially forwards relative to the direction of rotation of the rotating brush; it being understood that, hereby, the bristles are angled forwards in a direction towards the longitudinal groove 12 with the grinding element.
• Bristles 13 and the grinding element 8 may, as described above, be mounted in separate modules, but they may also, in a preferred embodiment of the invention, be mounted in the same module as the grinding element.
• the brush module may comprise a longitudinally extending groove (not shown) which extends centrally on the upper side of the brush module and which extends into the brush module and is configured for receiving the plurality of brushes 13. At an edge, these brushes will be mounted with a bead which is complementary to the longitudinally extending groove, to the effect that the grinding element 30 is axially displaceable in the longitudinal direction of the brush module.
• the bristles 13 are preferably angled at an angle ' ⁇ ' of between 10° and 60°, and more preferably at an angle of between 25° and 45° relative to an axis 'A' that extends through the brush module 1 and which is essentially in parallel with radius of the rotating brush.
• bristles 13 extend from the middle of the bottom face 16 and, during grinding, they serve to provide an abutment pressure on the rear side of the grinding cloth and will preferably be slightly shorter than the grinding cloth as such.
• the holder means 30 for the grinding cloth is shown.
• the holder means 30 is configured with a protruding bead 31 which is configured to cooperate with the groove 12 in the body portion 10 of the brush module; it being understood that the holder means 30 has a longitudinal expanse corresponding to the longitudinally extending groove 12.
• the holder means is configured with two flaps 32, 33 that extend at an angle relative to each other. Between the two flaps 32, 33 the grinding cloth 8 is arranged, following which the flaps 32, 33 are pressed towards each other and thus tightly clamp the grinding cloth 8.
• the body part of the brush module can be configured to engage directly with the undercut, longitudinally extending grooves in a grinding drum or cylinder, respectively.
• the grinding cloth may be secured directly on the brush module, eg by use of clips or gluing directly onto the sides of the body part.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=38294060

Family Applications (1)

Country Status (3)

Families Citing this family (3)

Family Cites Families (3)

• 2007
  • 2007-05-10 CN CNA2007800171677A patent/CN101443159A/zh active Pending
  • 2007-05-10 WO PCT/DK2007/000222 patent/WO2007131505A1/en active Application Filing
  • 2007-05-10 EP EP07722601A patent/EP2015898A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events