Patent US4038738A successfully refreshed from Google Patents.
US4038738A
Expired / Lapsed
US
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Method and means for the production of bar stock from metal powder
Assignee: Uddeholms AB
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Filing: 1975-01-10
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Granted: 1977-08-02
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Expires: 1995-01-10
Abstract
Abstract A method for powder metallurgical production of bar stock from an iron, nickel or cobalt based alloy comprises the steps of introducing a powder of the desired alloy into a tubular container together with a reducing agent and an oxygen getter, sealing the container without evacuating it, heating the sealed container and the powder therein, compacting the heated container by progressive forging and rolling the forged blank. Equipment for forging the container includes a tool having upper and lower dies defining between them an open-ended forging cavity which tapers from an entrance end towards an exit end and through which the container is fed in step-wise manner.
Inventors
- 👤 Hellmut Fischmeister
- 👤 Vaino Lampe
- 👤 Leif Olsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:31
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/1216; B22F3/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
154 words
A method for producing from a powder of alloys based on iron, nickel or cobalt bar stock having low porosity and good particle bonding, comprising the sequential steps of providing along the inner side only a hollow capsule an oxygen-affinitive reducing material having the ability to bind oxygen to itself more firmly than has the metal which is the predominant constituent of the powder particles, filling the capsule with the powder and an oxygen carrier to constitute a powder mass in the capsule, hermetically sealing the capsule and compacting the powder mass in the capsule by progressive forging of the capsule at a temperature in the range of 900°-1200° C, whereby a blank is formed and the oxygen carrier combines with oxygen in the powder mass to form a gas which is transported towards the inner side of the capsule and reacts there with the oxygen-affinitive material and removing the capsule from the blank.
Claim 2
Independent Claim
154 words
A method for producing from a powder of alloys based on iron, nickel or cobalt bar stock having low porosity and good particle bonding, comprising the sequential steps of providing along the inner side only a hollow capsule an oxygen-affinitive reducing material having the ability to bind oxygen to itself more firmly than has the metal which is the predominant constituent of the powder particles, filling the capsule with the powder and an oxygen carrier to constitute a powder mass in the capsule, hermetically sealing the capsule and compacting the powder mass in the capsule by progressive forging of the capsule at a temperature in the range of 900°-1200° C, whereby a blank is formed and the oxygen carrier combines with oxygen in the powder mass to form a gas which is transported towards the inner side of the capsule and reacts there with the oxygen-affinitive material and removing the capsule from the blank.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1 in which the oxygen-affinitive material is a material also having affinity for nitrogen.
Claim 4
Dependent Claim
14 words
A method as claimed in claim 1 in which the oxygen-affinitive material is titanium.
Claim 5
Dependent Claim
14 words
A method as claimed in claim 1 in which the oxygen carrier is carbon.
Claim 6
Dependent Claim
15 words
A method as claimed in claim 1 in which the oxygen carrier is a halide.
Claim 7
Dependent Claim
24 words
A method as claimed in claim 5 in which the oxygen-affinitive material is selected from the group consisting of of titanium, calcium and magnesium.
Claim 8
Dependent Claim
25 words
A method as claimed in claim 6 in which the oxygen carrier is a chloride of one of the metals present in the alloy powder.
Claim 9
Dependent Claim
29 words
A method as claimed in claim 1 in which the oxygen carrier in finely divided form is admixed to the powder before the powder is introduced into the capsule.
Claim 10
Dependent Claim
29 words
A method as claimed in claim 8 in which the oxygen-affinitive material is applied to the inner side of the capsule before the powder is introduced into the capsule.
Claim 11
Dependent Claim
28 words
A method as claimed in claim 8 in which the oxygen-affinitive material in finely divided form is introduced into the capsule simultaneously with the introduction of the powder.
Claim 12
Dependent Claim
62 words
A method as claimed in claim 1, in which the progressive forging of the capsule is effected in a forging tool including upper and lower halves which are relatively reciprocable in the vertical direction and define between them an open-ended forging zone having an entrance portion the cross-section of which gradually decreases from one end of the forging zone towards the other.
Claim 13
Dependent Claim
28 words
A method as claimed in claim 1, in which the blank obtained through the progressive forging is further compacted and reduced in cross-section by rolling between grooved rolls.
Claim 14
Independent Claim
247 words
A method for producing from a powder of alloys based on iron, nickel or cobalt bar stock having low porosity and good particle bonding, comprising the sequential steps of providing along the inner side only of a hollow capsule an oxygen-affinitive reducing material having the ability to bind oxygen to itself more firmly than has the metal which is the predominant constituent of the powder particles, filling the capsule with the powder admixed with an oxygen carrier in finely divided form to constitute a powder mass in the capsule, heremetically sealing the capsule and compacting the powder mass in the capsule by progressive forging of the capsule at a temperature in the range of 900°-1200° C., whereby a blank is formed as the oxygen carrier combines with oxygen in the powder mass to form a gas which is transported towards the inner side of the capsule and reacts there with the oxygen-affinitive material and removing the capsule from the blank, the method being further characterized in that the capsule is a vertical steel tube held in vertical position during the introduction of the powder and the oxygen-affinitive material into the capsule, the powder is gradually introduced into the capsule through a vertical tube extending into the capsule coaxially therewith and the oxygen-affinitive material is gradually introduced into the capsule at locations below the surface of the introduced powder through a plurality of vertical tubes extending into the tube along the inner side thereof at circumferentially spaced locations.
Claim 15
Independent Claim
247 words
A method for producing from a powder of alloys based on iron, nickel or cobalt bar stock having low porosity and good particle bonding, comprising the sequential steps of providing along the inner side only of a hollow capsule an oxygen-affinitive reducing material having the ability to bind oxygen to itself more firmly than has the metal which is the predominant constituent of the powder particles, filling the capsule with the powder admixed with an oxygen carrier in finely divided form to constitute a powder mass in the capsule, heremetically sealing the capsule and compacting the powder mass in the capsule by progressive forging of the capsule at a temperature in the range of 900°-1200° C., whereby a blank is formed as the oxygen carrier combines with oxygen in the powder mass to form a gas which is transported towards the inner side of the capsule and reacts there with the oxygen-affinitive material and removing the capsule from the blank, the method being further characterized in that the capsule is a vertical steel tube held in vertical position during the introduction of the powder and the oxygen-affinitive material into the capsule, the powder is gradually introduced into the capsule through a vertical tube extending into the capsule coaxially therewith and the oxygen-affinitive material is gradually introduced into the capsule at locations below the surface of the introduced powder through a plurality of vertical tubes extending into the tube along the inner side thereof at circumferentially spaced locations.
References Cited (Backward Citations)
US2155651A
Cited
US3834002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |