US4832707A
Expired / Lapsed
US
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Metal-bonded tool and method of manufacturing same
Assignee: Toshiba Corp
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Filing: 1988-05-19
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Granted: 1989-05-23
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Expires: 2008-05-19
Abstract
Abstract This invention provides a metal-bonded tool in which iron-base alloy powder and abrasive grains are bonded to each other. The quantity of the carbon or graphite in the bond being between 2.5 wt % or more and 4.5 wt % or less of the bond, and the diameter of the precipitated carbon or graphite being 5 μm or less in the bond.
Inventors
- 👤 Hisato Kamohara
- 👤 Kagetaka Amano
- 👤 Hiromichi Horie
- 👤 Keizo Shimamura
- 👤 Tatsuyoshi Aisaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:40
CPC Classifications
C; C22; C22C; C22C26/00
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
49 words
A metal-bonded tool, comprising: a base metal portion; and a sinter providing on the base metal portion comprising an iron-base alloy containing carbon or graphite of 2.5 wt %-4.5 wt % and having a grain diameter of 5 μm or less of carbon or graphite precipitates, and abrasive grains.
Claim 2
Dependent Claim
49 words
A metal-bonded tool, comprising: a base metal portion; and a sinter providing on the base metal portion comprising an iron-base alloy containing carbon or graphite of 2.5 wt %-4.5 wt % and having a grain diameter of 5 μm or less of carbon or graphite precipitates, and abrasive grains.
Claim 3
Dependent Claim
32 words
The metal-bonded tool according to claim 1, wherein the diameter of 90% or more said carbon or graphite precipitates does not exceed one tenth of the average diameter of said abrasive grains.
Claim 4
Dependent Claim
45 words
The metal-bonded tool according to claim 1, wherein said iron-base alloy further comprises silicon and wherein also the relationship between the quantity of silicon (A wt %) and the quantity of carbon or graphite (B wt %) contained in said iron-base alloy; 3≦B+A/3≦5 is satisfied.
Claim 5
Dependent Claim
25 words
The metal-bonded tool according to claim 1, wherein the base metal consists essentially of a material having a logarithric decrement (δ) of 0.005 or more.
Claim 6
Dependent Claim
27 words
The metal-bonded tool according to claim 1, wherein said iron-base alloy contains 2.5 wt %-4.5 wt % carbon or graphite and 1.0 wt %-3.5 wt % silicon.
Claim 7
Dependent Claim
21 words
The metal-bonded tool according to claim 1, wherein either of diamond or cubic boron nitride is used as said abrasive grains.
Claim 8
Dependent Claim
23 words
The metal-bonded tool according to claim 1, wherein surfaces of abrasive grains are covered by at least one of nickel, copper and cobalt.
Claim 9
Dependent Claim
21 words
The metal-bonded tool according to claim 1, wherein the iron-base alloy includes silicon, carbon or graphite, unavoidable impurities and residual iron.
Claim 10
Dependent Claim
17 words
The metal-bonded tool according to claim 1, wherein the iron-base alloy includes at least nickel or cobalt.
Claim 11
Independent Claim
37 words
A method of manufacturing a metal-bonded tool; comprising steps: mixing Fe-Si alloy powder containing 10 wt %-50 wt % silicon, graphite powder, iron powder and abrasive grains; sintering the raw powders and abrasive grains on the base-metal.
Claim 12
Independent Claim
37 words
A method of manufacturing a metal-bonded tool; comprising steps: mixing Fe-Si alloy powder containing 10 wt %-50 wt % silicon, graphite powder, iron powder and abrasive grains; sintering the raw powders and abrasive grains on the base-metal.
Claim 13
Dependent Claim
38 words
The method of manufacturing according to claim 10, wherein relations between the quantity of the silicon (A wt %) and the quantity of the carbon or graphite (B wt %) in the iron-base alloy; 2.5≦B≦4.5 3≦B+A/3≦5 are satisfied.
Claim 14
Dependent Claim
28 words
The method of manufacturing according to claim 11, wherein the iron-base alloy includes 2.5 wt %-4.5 wt % carbon or graphite and 1.0 wt %-3.5 wt % silicon.
Claim 15
Dependent Claim
22 words
The method of manufacturing according to claim 11, wherein the abrasive grains include at least one of diamond or cubic boron nitride.
Claim 16
Dependent Claim
17 words
The method of manufacturing according to claim 10, wherein sintering is carried out at 1000° C.-1180° C.
Claim 17
Dependent Claim
29 words
The method of manufacturing according to claim 10, wherein sintering is carried out using hot pressing at 850° C.-1180° C. under the pressure of 50 kg/cm 2 or more.
Claim 18
Independent Claim
43 words
A method of manufacturing a metal-bonded tool, comprising steps: providing iron-base alloy powder including carbon or graphite of 2.5 wt %-4.5 wt % by the atomizing process; mixing the iron-base alloy powder and abrasive grains; and sintering the iron-base powder and abrasive grains.
Claim 19
Independent Claim
43 words
A method of manufacturing a metal-bonded tool, comprising steps: providing iron-base alloy powder including carbon or graphite of 2.5 wt %-4.5 wt % by the atomizing process; mixing the iron-base alloy powder and abrasive grains; and sintering the iron-base powder and abrasive grains.
Claim 20
Dependent Claim
46 words
The method of manufacturing according to claim 16, wherein said iron-base alloy further comprises silicon and wherein also the relationship between the quantity of silicon (A wt %) and the quantity of carbon or graphite (B wt %) contained in the iron-base alloy; 3≦B+A/3≦5 is satisfied.
Claim 21
Dependent Claim
28 words
The method of manufacturing according to claim 16, wherein the iron-base alloy contains 2.5 wt %-4.5 wt % carbon or graphite and 1.0 wt %-3.5 wt % silicon.
Claim 22
Dependent Claim
21 words
The method of manufacturing according to claim 16, wherein said abrasive grains are used either of diamond or cubic boron nitride.
Claim 23
Dependent Claim
17 words
The method of manufacturing according to claim 16, wherein sintering is carried out at 1000° C.-1180° C.
Claim 24
Dependent Claim
30 words
The method of manufacturing according to claim 16, wherein sintering is carried out using hot pressing at 850° C. -1180° C. under a pressure of 50 kg/cm 2 or more.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |