US4015780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder forming
Assignee: BOC Ltd Australia
•
Filing: 1975-05-05
•
Granted: 1977-04-05
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Expires: 1995-05-05
Abstract
Abstract A process for producing powdered metal which comprises taking metal swarf, removing oil and grease from the swarf, cooling the swarf to a temperature below -20° C and milling the cooled swarf to form powder.
Inventors
- 👤 Robert Gilmore Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:04
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/04; Y; Y10; Y10S; Y10S241/00; Y10S241/37
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
A process for producing powdered metal which comprises taking metal swarf, substantially removing oil from the swarf, reducing the metal swarf to a particle size of about 6 mm diameter, then substantially removing residual oil and grease from the said particles, cooling the said particles of swarf to a temperature in the range of about minus 20° C to minus 100° C to considerably reduce the impact strength of the swarf particles, and introducing the so cooled swarf particles into a comminuting mill wherein coolant is introduced into the mill during the milling operation so as to maintain the swarf particles at the said temperature range during comminution to a powdered metal having a particle size in the range of about -40 to +350 BSS for producing metal powder suitable for compaction and forging by conventional powder metallurgy techniques.
Claim 2
Dependent Claim
139 words
A process for producing powdered metal which comprises taking metal swarf, substantially removing oil from the swarf, reducing the metal swarf to a particle size of about 6 mm diameter, then substantially removing residual oil and grease from the said particles, cooling the said particles of swarf to a temperature in the range of about minus 20° C to minus 100° C to considerably reduce the impact strength of the swarf particles, and introducing the so cooled swarf particles into a comminuting mill wherein coolant is introduced into the mill during the milling operation so as to maintain the swarf particles at the said temperature range during comminution to a powdered metal having a particle size in the range of about -40 to +350 BSS for producing metal powder suitable for compaction and forging by conventional powder metallurgy techniques.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1, wherein said cooling is by direct contact with a coolant.
Claim 4
Dependent Claim
17 words
A process as claimed in claim 1, wherein said cooling is effected indirectly by using a coolant.
References Cited (Backward Citations)
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US3163929A
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US3768739A
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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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |