Abrading – Rigid tool
Patent
1995-01-11
1997-03-04
Eley, Timothy V.
Abrading
Rigid tool
451548, B23F 2103
Patent
active
056073461
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a polishing tool component.
Polishing pads are used extensively in industry for fine finishing or polishing various workpieces, which are typically stone or ceramic in nature. Such polishing pads consist of a carrier having a layer of abrasive particles suitably secured to a surface thereof. The abrasive particles may be secured to the surface of the carrier by means of metal or resin binders.
French Patent No. 2532875 discloses a grinding wheel comprising a plurality of abrasive pads mounted on a support. The abrasive pads comprise a mass of discrete abrasive particles uniformly dispersed in a bonding matrix. The pads are in the form of strips.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a polishing tool component, comprising a carrier and a plurality of spaced abrasive elements located in the carrier, each abrasive element presenting an abrasive working surface having a perimeter which is circular, polygonal or like non-elongate shape and comprising a mass of abrasive particles uniformly dispersed in a bonding matrix, the abrasive working surfaces of the elements together defining a working surface for the component.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of an embodiment of a polishing pad of the invention;
FIG. 2 is a section along the line 2--2 of FIG. 1;
FIG. 3 is a perspective view of a carrier of a second embodiment of the invention; and
FIG. 4 is a section along the line 4--4 of FIG. 3.
DESCRIPTION OF EMBODIMENTS
The polishing tool component of the invention may be one suitable for various polishing tools such as revolving tools, revolving pendulum action tools and planetary polishing tools. The shape of the component may be any known in the art such as rectangular, as is generally used with revolving and revolving pendulum action tools, or disc-shaped, as is generally used with planetary polishing tools.
The carrier will generally present a surface in which the abrasive elements are located. The working surfaces of the elements may be located in this surface or they may project beyond this surface. When the working surfaces project beyond the carrier surface in which they are located, they may include at least one peak. This peak may provide a sharp point, e.g. it may be cone-shaped. Such peaks, when provided, will generally each have the same height from the carrier surface in which the elements are located.
The perimeter of the working surfaces may be circular, square or rectangular. The working surface may cover the entire area within the perimeter or may cover a portion of the area only, e.g. be ring-shaped.
The abrasive working surfaces of the elements together define an abrasive working or polishing surface for the component. To achieve this it is preferable that the abrasive elements are uniformly distributed across the carrier. The elements may, for example, be arranged in rows such that the working surfaces of the elements in one row are staggered relative to the working surfaces of the elements in an adjacent row. Alternatively, the elements may be arranged in rows such that the working surfaces of the elements in one row are in register with the working surfaces of the elements in an adjacent row.
The abrasive particles will preferably be ultra-hard abrasive particles such as diamond or cubic boron nitride. These particles will typically have a particle size of up to 500 microns and be present in an amount of up to 30 percent by volume.
The bonding matrix may be metal, ceramic or resin. When it is resin it is preferably a non-porous thermoplastic polymer, which may contain fibrous or particulate filling materials. Examples of suitable thermoplastic polymers are: marketed by ICI under the trade name VICTREX.RTM.. ULTRAPEK.RTM.. TORLON.RTM.. name RYTON.RTM.. trade name VECTRA.RTM..
Examples of suitable metal bonding matrices are bronze and cobalt-bronze.
The carrier may be rigid or flexible. It may be made of a metal such as steel or a polymer which may be thermosett
REFERENCES:
patent: 1290990 (1919-01-01), Hickey
patent: 1953983 (1934-04-01), Benner
patent: 2000772 (1935-05-01), McGill
patent: 2145888 (1939-02-01), Moulton et al.
patent: 2225193 (1940-12-01), Benner et al.
patent: 3343308 (1967-09-01), Fessel
patent: 4041650 (1977-08-01), Sawluk
patent: 4457765 (1984-07-01), Wilson
Patent Abstracts of Japan, vol. 9, No. 7 (M-350) (1730) Jan. 12, 1985 & JP A 59-156669.
Sexton John S.
Wilson Stuart M.
Wright Derek N.
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