US5460776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing connected sintered articles
Assignee: Sintertech SAS
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Filing: 1994-10-26
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Granted: 1995-10-24
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Expires: 2014-10-26
Abstract
Abstract The invention relates to a method of producing connected sintered articles obtained by breaking a unitary preform. It is characterized in that: a) a preform is pressed from powdered metals while imprinting in it a superficial groove (3) located in a plane for the purpose of subsequent breakage, b) this preform is presintered in order to consolidate it mechanically, the preform however remaining brittle, c) it is optionally compacted by recompression, d) recesses for the members for the mechanical connection of the final parts are optionally machined in this preform, e) this preform is broken into at least two parts, f) final sintering is carried out, g) the articles are cooled. The invention is applicable in particular to the production of connecting rods and connecting rod covers or of annular articles with or without an undercut (broken in the axial plane).
Inventors
- 👤 Luc Ackermann
- 👤 Henri Gueydan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:44
CPC Classifications
F; F16; F16C; F16C9/00; F16C9/04; F16C9/045; B; B22; B22F; B22F5/00; B22F5/003
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A process for producing connectable sintered metallic articles, comprising the steps of: a) pressing a preform from powdered metals, imprinting in said preform during said pressing a superficial groove in an outwardly directed external surface of said preform, said groove being located in a plane for the purpose of subsequent breakage; b) presintering to consolidate the preform; c) optionally compacting the consolidated preform by recompression; d) optionally machining into the consolidated preform recesses to enable mechanical connection of said articles; e) breaking the consolidated preform into at least two parts; f) conducting a final sintering of each of the least two parts; and g) cooling the sintered parts to form said connectable metallic articles.
Claim 2
Dependent Claim
114 words
A process for producing connectable sintered metallic articles, comprising the steps of: a) pressing a preform from powdered metals, imprinting in said preform during said pressing a superficial groove in an outwardly directed external surface of said preform, said groove being located in a plane for the purpose of subsequent breakage; b) presintering to consolidate the preform; c) optionally compacting the consolidated preform by recompression; d) optionally machining into the consolidated preform recesses to enable mechanical connection of said articles; e) breaking the consolidated preform into at least two parts; f) conducting a final sintering of each of the least two parts; and g) cooling the sintered parts to form said connectable metallic articles.
Claim 3
Dependent Claim
14 words
Process according to claim 1, wherein the articles obtained in g) are mechanically connected.
Claim 4
Dependent Claim
12 words
Process according to claim 1, wherein the breaking is performed by bending.
Claim 5
Dependent Claim
13 words
Process according to claim 1, wherein the breaking is performed by tensile stress.
Claim 6
Dependent Claim
22 words
Process according to claims 1, wherein the elongation at break under tensile stress of the presintered preform b) is lower than 1%.
Claim 7
Dependent Claim
10 words
Process according to claim 1, wherein the groove is rectilinear.
Claim 8
Dependent Claim
14 words
Process according to claim 1, wherein the machining operations essentially involve perforation and tapping.
Claim 9
Dependent Claim
18 words
Process according to claim 2 wherein the mechanically connected articles are a connecting rod and connecting rod cover.
Claim 10
Dependent Claim
31 words
Process according to claim 1, wherein said groove has a predetermined length, and the breaking is performed by applying a force in a direction perpendicular to the length of the groove.
Claim 11
Dependent Claim
22 words
Process according to claim 1, wherein the groove has a bottom portion having a radius of curvature (r) smaller than 0.5 mm.
Claim 12
Dependent Claim
15 words
Process according to claim 10, wherein the radius of curvature is smaller than 0.2 mm.
References Cited (Backward Citations)
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US4993134A
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US5109605A
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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) | 1998-10-23 | 1999-04-24 | 1999-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-23 | 2003-04-24 | 2003-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-23 | 2007-04-24 | 2007-10-24 | $7700.00 | Window Closed / Lapsed |