US3773565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zone refining
Assignee: SKF Industries Inc
•
Filing: 1970-11-27
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Granted: 1973-11-20
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Expires: 1990-11-27
Abstract
Abstract A method of making a machine component comprising forming the component to shape and, before heat treating to harden it or finish machining it, re-melting at least one zone on its surface by means of an energy beam while the component is in a vacuum.
Inventors
- 👤 A Pye
- 👤 B Lundgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:08
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06; C21D1/09; C21D9/00; C21D9/40; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49643; Y10T29/49679; Y10T29/49689; Y10T29/49703
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A method of making an annular member made of a steel composition having a circumferentially extending working surface consisting of the steps of forming the annular member with a surface constituting a raceway surface, remelting the surface of said raceway by means of an electron beam while the annular member is in a vacuum to reduce the brittle and sulfide inclusions and increase the fatigue endurance of said raceway zone.
Claim 2
Independent Claim
82 words
A method of making a bearing ring made of a steel composition having a circumferentially extending raceway surface zone consisting of the steps of forming the bearing ring with a raceway surface zone, remelting the raceway surface zone by means of an electron beam while the ring is in a vacuum to reduce brittle and sulfide inclusions and increase the fatigue endurance of said zone, and thereafter heat treating the bearing ring to harden the same and finish machining the bearing ring.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1 including the step of preheating the machine component to a temperature below its melting temperature before remelting the working zone.
Claim 4
Dependent Claim
46 words
An annular member made by the process of claim 1 wherein the hardness of the remelted bearing raceway zone is about 48.0 HRC and the inclusions in said zone are as follows: Sulphides - about 0.3 Alumina - about 0.6 Oxides - untraceable Tin - untraceable
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |