Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
  • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
  • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
  • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
  • B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
  • B24D5/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with cooling provisions, e.g. with radial slots

Definitions

• the present invention concerns a grinding wheel particularly designed for grinding work at a high feed speed, having the characteristics mentioned in the preamble of the main claim.
• the particular nature of the grinding work also requires an abrasive surface of the grinding wheel, that surface which comes into contact with the workpiece to be subjected to grinding, extending continuously over the cylindrical outside wall of the body of the grinding wheel.
• the principal aim of the invention is that of providing a grinding wheel structurally and functionally designed to obtain improved distribution of the cooling/lubricating liquid in the area of contact with the workpiece being processed, in order to convey the liquid more homogeneously and to obtain, even in the case of high feed speeds of the grinding wheel, a greater reduction in chipping of the workpieces being processed and a longer service life of the tool, compared with known solutions.
• - Figure 1 is a perspective view from above of a grinding wheel produced according to the invention.
• - Figure 4 is a partial perspective view, on an enlarged scale compared with
• the reference 1 indicates as a whole a grinding wheel designed for grinding work at a high feed speed, which is produced according to the present invention.
• the grinding wheel 1 comprises a discoid body 2, axially symmetrical with respect to a main axis X, about which the grinding wheel can be set in rotation in the processing stages.
• the discoid body 2 is provided with a central hub with through holes 3 for fixing to a drive shaft, not shown.
• the discoid body 2 also extends between two axially opposed faces 2a, 2b, between which is defined a cylindrical outside wall 4 bearing the abrasive material suitable for the grinding operations.
• a seat 5 is provided which runs circumferentially, and wherein the abrasive material 6 is disposed, the material appearing on the cylindrical outside wall with an abrasive surface, indicated by 6a, which extends circumferentially, without a gap, in the region of the outside wall 4.
• the surface 6a has in axial section ( Figure 2) a curved transverse profile with a concavity facing towards the workpiece (not shown) to be subjected to grinding.
• the profile is designed for the grinding of corresponding edges with convex profile, such as those provided on the peripheral edges of the windows of motor vehicles, the grinding of which is conveniently carried out with the grinding wheel of the invention.
• the grinding wheel comprises a plurality of ducts 7, extending radially in the discoid body 2, and one of which can be seen in section in Figure 2 (this figure shows a half section, by reason of the axial symmetry). Only one of the ducts 7 will be described in detail hereinafter, since they are identical in structure and function.
• Each duct 7 extends radially in the body 2 for a radial portion extending between a first end 7a, at which the duct opens into the surface 6a of the outside wall 4, and an opposed end 7b, communicating with a cavity or recess 8.
• Said recess has an annular configuration and extends circumferentially on the face 2a of the disc, coaxially with the axis X.
• the recess 8 opens to the outside via a mouth 8a in the shape of an annular rim concentric with the axis X.
• the volume of the recess 8 is selected to be such that the cavity forms a kind of reservoir of predetermined capacity, fed via a stationary delivery duct
• the capacity of the recess 8 ensures that in each duct 7 a corresponding quantity of liquid is distributed homogeneously, and is then conveyed by centrifugal action (during the rotation of the disc) from the ducts 7 onto the abrasive surface 6a, thus ensuring the homogeneous distribution of liquid onto the surface itself.
• the liquid may consist of a lubricating or cooling liquid or, as a further alternative, of a liquid having both lubricating and cooling properties.
• a preferred example provides for the liquid to be water.
• the ducts 7 are provided so as to pass through the abrasive material 6, until they reach the end section communicating with the outside of the outside wall 4.
• the ducts 7 conveniently have a cross-section of circular shape (for example are produced as simple radial through holes) or of elliptical shape or, as a further alternative, may have a cross-section of polygonal, for example rectangular, shape.
• the number and dimension of the ducts provided in the discoid body 2 may further vary according to specific requirements and to the rotation speeds or the feed speeds provided for conducting the grinding wheel 1 in the grinding phases, and also according to the dimensions of the grinding wheel and of the window edge to be subjected to grinding.
• a preferred example provides for twelve ducts 7 disposed at a regular angular pitch and having a circular cross-section, as shown in Figure 2.
• the invention thus achieves the aims proposed, obtaining the advantages claimed above with reference to the prior art.
• a principal advantage lies in the fact of being able to obtain, in grinding wheels at high feed speeds, a distribution of cooling/lubricating liquid of improved homogeneity, with which it is possible to obtain a greater reduction in chipping of the ground window in addition to a longer service life of the grinding wheel. This is particularly noticeable with particularly high feed speeds, also in ranges from 14 m/min. up to 36 m/min.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Inorganic Chemistry (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Disintegrating Or Milling (AREA)
• Glass Compositions (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40837829

Family Applications (1)

Country Status (4)

Families Citing this family (6)

Family Cites Families (9)

• 2008
  • 2008-07-31 IT IT000237A patent/ITPD20080237A1/it unknown
• 2009
  • 2009-07-28 US US13/056,568 patent/US20110130081A1/en not_active Abandoned
  • 2009-07-28 EP EP09787808A patent/EP2331290A1/en not_active Withdrawn
  • 2009-07-28 WO PCT/IT2009/000336 patent/WO2010013278A1/en active Application Filing

Non-Patent Citations (1)

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