US4750915A
Expired / Lapsed
US
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Composite whetstone for polishing soft metals
Assignee: KANEBO Ltd A CORP OF JAPAN
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Filing: 1986-02-20
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Granted: 1988-06-14
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Expires: 2006-02-20
Abstract
Abstract This invention pertains to a composite whetstone for polishing soft metal plates, such as an aluminium disc, etc., which comprises matrix and fine abrasive particle. The matrix, uniform in structure, is composed of a polyvinyl acetal-based polymer, a hardened product of at least one kind of thermosetting plastic and amorphous silicate, the fine abrasive particle is incorporated into the matrix fixed substantially in close contact with each other in a continuous manner, wherein the superficial hardness (H) of the composite whetstone, measured by a Rockwell hardness tester with a superficial 15-Y scale, and the size (G) of the fine abrasive particle, determined by a classification procedure according to Japanese Industrial Standard (JIS) R-6001, have to satisfy the following relation. -180≦H+G/55≦-50.
Inventors
- 👤 Yoji Tomita
- 👤 Takesi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:53
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/34; B24D3/02; B24D3/20; B24D3/28; B24D3/32
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
A composite whetstone for polishing soft metals comprising matrix and fine abrasive particle, characterized in that said matrix forms a three-dimensional network structure with continuous fine voids therein and is composed uniformly of a polyvinyl acetal-based polymer, a hardened product of at least one kind of thermosetting plastic and amorphous silicate, said fine abrasive particle is incorporated into said matrix fixed substantially in close contact with each other in a continuous manner, and the superficial hardness (H) of said composite whetstone and the size (G) of said fine abrasive particle satisfy a relation -180≦H+G/55≦-50, where H is a value obtained from the measurement by a Rockwell hardness tester with the superficial 15-Y scale and G is a value obtained from the classification according to Japanese Industrial Standard (JIS) R-6001.
Claim 2
Dependent Claim
129 words
A composite whetstone for polishing soft metals comprising matrix and fine abrasive particle, characterized in that said matrix forms a three-dimensional network structure with continuous fine voids therein and is composed uniformly of a polyvinyl acetal-based polymer, a hardened product of at least one kind of thermosetting plastic and amorphous silicate, said fine abrasive particle is incorporated into said matrix fixed substantially in close contact with each other in a continuous manner, and the superficial hardness (H) of said composite whetstone and the size (G) of said fine abrasive particle satisfy a relation -180≦H+G/55≦-50, where H is a value obtained from the measurement by a Rockwell hardness tester with the superficial 15-Y scale and G is a value obtained from the classification according to Japanese Industrial Standard (JIS) R-6001.
Claim 3
Dependent Claim
32 words
A composite whetstone for polishing soft metals as set forth in claim 1, in which said matrix contains 0.1-10% by weight of said amorphous silicate based upon the weight of said matrix.
Claim 4
Dependent Claim
40 words
A composite whetstone for polishing soft metals as set forth in claim 1 or 2, in which said thermosetting plastic comprises at least one kind of polymer selected from the group consisting of a melamine-based resin, and a phenol-based resin.
Claim 5
Dependent Claim
45 words
A composite whetstone for polishing soft metals as set forth in any one claims 1 or 2, in which said fine abrasive particle comprises at least one kind of abrasive selected from the group comsisting of silicon carbide, fused alumina, chromium oxide and cerium oxide.
Claim 6
Dependent Claim
40 words
A composite whetstone for polishing soft metals as set forth in claim 4 wherein said fine abrasive particle is at least one kind of abrasive selected from the group consisting of silicon carbide, fused alumina, chromium oxide and cerium oxide.
Claim 7
Dependent Claim
30 words
A composite whetstone for polishing soft metals as set forth in claim 1 wherein said continuous fine voids have a diameter in the range of from 10 to 100 microns.
Claim 8
Dependent Claim
26 words
A composite whetstone for polishing soft metals as set forth in claim 6 wherein said matrix has a porosity of from 60 to 85% by volume.
Claim 9
Dependent Claim
25 words
A composite whetstone for polishing soft metals as set forth in claim 1 wherein said amorphous silicate is a gel-like inorganic polymer of formula ##STR2##
Claim 10
Dependent Claim
20 words
A composite whetstone for polishing soft metals as set forth in claim 1 wherein said amorphous silicate is an aluminosilicate.
Claim 11
Dependent Claim
46 words
A composite whetstone for polishing soft metals as set forth in claim 1 wherein said fine abrasive particle is at least grade #800 and is present in said composite in an amount of at least 25% by weight, based upon the weight of the whole matrix.
Claim 12
Dependent Claim
19 words
The composite whetstone of claim 10 wherein the amount of said abrasive particle is at least 35% by weight.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |