Patent US4153477A successfully refreshed from Google Patents.
US4153477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction stressed machine parts of cast iron with ledeburitic bearing surface and methods for their production
Assignee: Goetzewerke Friedrich Goetze AG
•
Filing: 1977-04-28
•
Granted: 1979-05-08
•
Expires: 1997-04-28
Abstract
Abstract A friction stressed machine part of cast iron with a ledeburitic-containing bearing surface contains 0.1 to 10 area percent of predominantly nodular-shaped graphite in the ledeburitic-containing bearing surface. A number of methods for producing such a machine part are provided, including, casting the machine part against a quenching plate so that it hardens in a mottled manner in the region of the bearing surface.
Inventors
- 👤 Horst Beyer
- 👤 Hans J. Neuhauser
- 👤 Hans-Jurgen Veutgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:36
CPC Classifications
F; F01; F01C; F01C19/00; F01C19/005; C; C21; C21D; C21D5/00; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/939
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
45 words
In a friction stressed machine part of cast iron which machine part is a sealing strip for a rotary engine, said sealing strip having a ledeburitic-containing bearing surface, the improvement wherein 0.1 to 10 area percent of the ledeburitic-containing bearing surface is predominantly nodular-shaped graphite.
Claim 2
Dependent Claim
45 words
In a friction stressed machine part of cast iron which machine part is a sealing strip for a rotary engine, said sealing strip having a ledeburitic-containing bearing surface, the improvement wherein 0.1 to 10 area percent of the ledeburitic-containing bearing surface is predominantly nodular-shaped graphite.
Claim 3
Independent Claim
93 words
A method for producing a friction stressed machine part of cast iron with a ledeburitic-containing bearing surface, wherein 0,1 to 10 area percent of predominantly nodular-shaped graphite is present in the ledeburitic-containing bearing surface, comprising producing the machine part by casting a molten cast iron having a temperature of about 1500° to 1550° C. against a quenching plate to quench the molten cast iron to a temperature of about 700° C. in 10 to 15 seconds so that the machine part hardens in a mottled manner in the region of the bearing surface.
Claim 4
Independent Claim
93 words
A method for producing a friction stressed machine part of cast iron with a ledeburitic-containing bearing surface, wherein 0,1 to 10 area percent of predominantly nodular-shaped graphite is present in the ledeburitic-containing bearing surface, comprising producing the machine part by casting a molten cast iron having a temperature of about 1500° to 1550° C. against a quenching plate to quench the molten cast iron to a temperature of about 700° C. in 10 to 15 seconds so that the machine part hardens in a mottled manner in the region of the bearing surface.
Claim 5
Independent Claim
95 words
A method for producing a friction stressed machine part of cast iron with a ledeburitic-containing bearing surface, from a non-ledeburitic-containing bearing surface, wherein 0.1 to 10 area percent of predominantly nodular-shaped graphite is present in the ledeburitic-containing bearing surface comprising melting the non-ledeburitic bearing surface of the machine part to a temperature of about 1500° to 1550° C. and then quenching the melted bearing surface to a temperature of about 700° C. in 10 to 15 seconds so as to harden in a mottled manner and thereby produce a ledeburitic-containing bearing surface having nodular-shaped graphite.
Claim 6
Independent Claim
95 words
A method for producing a friction stressed machine part of cast iron with a ledeburitic-containing bearing surface, from a non-ledeburitic-containing bearing surface, wherein 0.1 to 10 area percent of predominantly nodular-shaped graphite is present in the ledeburitic-containing bearing surface comprising melting the non-ledeburitic bearing surface of the machine part to a temperature of about 1500° to 1550° C. and then quenching the melted bearing surface to a temperature of about 700° C. in 10 to 15 seconds so as to harden in a mottled manner and thereby produce a ledeburitic-containing bearing surface having nodular-shaped graphite.
Claim 7
Dependent Claim
24 words
Method as defined in claim 3, wherein the melting is performed by an electric arc, induction heating, laser beam, plasma beam, or electron beam.
Claim 8
Dependent Claim
38 words
Method as defined in claim 3, wherein the melting takes place in the presence on the bearing surface of at least one of the elements boron, zirconium, bismuth, tellurium, the lanthanides, magnesium, strontium, tin, antimony, aluminum and lead.
Claim 9
Independent Claim
109 words
A method for producing a friction stressed machine part of cast iron with a ledeburitic-containing bearing surface, wherein 0.1 to 10 area percent of predominantly nodular-shaped graphite is present in ledeburitic-containing bearing surface, comprising producing the machine part by casting against a quenching plate so as to ledeburitically harden the machine part in the region of the bearing surface, and subjecting the bearing surface to a tempering treatment after hardening by heating the machine part for 15 minutes to two hours to a temperature above 700° C., thereafter quenching to below 500° C., and then reheating for 30 minutes to two hours to a temperature up to 700° C.
Claim 10
Independent Claim
109 words
A method for producing a friction stressed machine part of cast iron with a ledeburitic-containing bearing surface, wherein 0.1 to 10 area percent of predominantly nodular-shaped graphite is present in ledeburitic-containing bearing surface, comprising producing the machine part by casting against a quenching plate so as to ledeburitically harden the machine part in the region of the bearing surface, and subjecting the bearing surface to a tempering treatment after hardening by heating the machine part for 15 minutes to two hours to a temperature above 700° C., thereafter quenching to below 500° C., and then reheating for 30 minutes to two hours to a temperature up to 700° C.
Claim 11
Independent Claim
98 words
A method for producing a friction stressed machine part of cast iron with a ledeburitic-containing bearing surface, wherein 0.1 to 10 area percent of predominantly nodular-shaped graphite is present in the ledeburitic-containing bearing surface, comprising melting the bearing surface of the machine part, ledeburitically quenching the melted bearing surface, and then subjecting the machine part to a tempering treatment by heating the machine part for 15 minutes to two hours to a temperature above 700° C., thereafter quenching to below 500° C., and then reheating for 30 minutes to two hours to a temperature up to 700° C.
Claim 12
Independent Claim
98 words
A method for producing a friction stressed machine part of cast iron with a ledeburitic-containing bearing surface, wherein 0.1 to 10 area percent of predominantly nodular-shaped graphite is present in the ledeburitic-containing bearing surface, comprising melting the bearing surface of the machine part, ledeburitically quenching the melted bearing surface, and then subjecting the machine part to a tempering treatment by heating the machine part for 15 minutes to two hours to a temperature above 700° C., thereafter quenching to below 500° C., and then reheating for 30 minutes to two hours to a temperature up to 700° C.
Claim 13
Dependent Claim
24 words
Method as defined in claim 7, wherein the melting is performed by an electric arc, induction heating, laser beam, plasma beam, or electron beam.
Claim 14
Dependent Claim
38 words
Method as defined in claim 7, wherein the melting takes place in the presence on the bearing surface of at least one of the elements boron, zirconium, bismuth, tellurium, the lanthanides, magnesium, strontium, tin, antimony, aluminum and lead.
Claim 15
Dependent Claim
19 words
Method as defined in claim 2, wherein the cast iron is alloyed or unalloyed cast iron with lamellar graphite.
Claim 16
Dependent Claim
19 words
Method as defined in claim 2, wherein the cast iron is alloyed or unalloyed cast iron with spherical graphite.
Claim 17
Dependent Claim
47 words
In a friction stressed machine part of cast iron, which machine part is a piston ring for an internal combustion engine, said piston ring having a ledeburitic-containing sliding surface, the improvement wherein the ledeburitic-containing sliding surface contains from 0.1 to 10 area percent of predominantly nodular-shaped graphite.
Claim 18
Dependent Claim
47 words
In a friction stressed machine part of cast iron, which machine part is a piston ring for an internal combustion engine, said piston ring having a ledeburitic-containing sliding surface, the improvement wherein the ledeburitic-containing sliding surface contains from 0.1 to 10 area percent of predominantly nodular-shaped graphite.
Claim 19
Dependent Claim
34 words
Method as defined in claim 6, wherein the heating is at a temperature of from 700° C. to 1025° C. and the quenching is to a temperature of between 400° C. and 500° C.
Claim 20
Dependent Claim
34 words
Method as defined in claim 7 wherein the heating is at a temperature of from 700° C. to 1025° C. and the quenching is to a temperature of between 400° C. and 500° C.
References Cited (Backward Citations)
US3802927A
Cited
US3998664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |