US5115663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a crankshaft
Assignee: Honda Motor Co Ltd
•
Filing: 1990-11-21
•
Granted: 1992-05-26
•
Expires: 2010-11-21
Abstract
Abstract A shaped metallic article such as a crankshaft is produced from a hollow pipe which is commercially available. The hollow pipe, which has a predetermined wall thickness, is squeezed into a hollow blank pipe having a predetermined shape and wall thickness. A region of the hollow blank pipe is then heated, and the heated region is upset and bent into a crankshaft, for example. The hollow blank pipe is upset and bent by dies positioned one on each side of the gripped portion of the blank and moving toward each other, and also by punches. After the crankshaft is forged, one of the punches is released from the crankshaft before the dies are separated therefrom.
Inventors
- 👤 Shyoichi Ando
- 👤 Shuichi Yamane
- 👤 Yoshihisa Doi
- 👤 Hisayuki Sakurai
- 👤 Haruo Meguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:14
CPC Classifications
F; F16; F16C; F16C3/00; F16C3/04; F16C3/06; B; B21; B21K; B21K1/00; B21K1/06; B21K1/08; Y; Y10; Y10S; Y10S72/00; Y10S72/713; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49286
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
A method of forming a shaped metallic article, comprising the steps of: gripping a portion of an elongate blank with a pair of punches with terminal ends of the gripped portion extending on either side of the pair of punches; upsetting and bending the blank with dies positioned one on each side of the gripped portion of the blank by moving toward each other into engagement with the terminal ends of the blank, and with said punches, thereby forming an elongate article into a crankshaft having journals; and thereafter, rolling said journals of the elongate article to correct the same out of a bent configuration.
Claim 2
Independent Claim
105 words
A method of forming a shaped metallic article, comprising the steps of: gripping a portion of an elongate blank with a pair of punches with terminal ends of the gripped portion extending on either side of the pair of punches; upsetting and bending the blank with dies positioned one on each side of the gripped portion of the blank by moving toward each other into engagement with the terminal ends of the blank, and with said punches, thereby forming an elongate article into a crankshaft having journals; and thereafter, rolling said journals of the elongate article to correct the same out of a bent configuration.
Claim 3
Dependent Claim
63 words
The method for forming a shaped metallic article as recited in claim 1, wherein said elongated blank is a hollow blank pipe and further comprising, before said gripping step, the steps of: squeezing a hollow pipe having a predetermined wall thickness into a hollow blank pipe having a predetermined shape and wall thickness; and locally heating a region of said hollow blank pipe.
Claim 4
Dependent Claim
34 words
The method of forming a shaped metallic article as recited in claim 2, wherein said squeezing step comprises the step of uniformizing the wall thickness of said pipe to a substantially constant wall thickness.
Claim 5
Dependent Claim
37 words
The method of forming a shaped metallic article as recited in claim 2, wherein said squeezing step comprises the step of squeezing a selected region of the pipe to increase the wall thickness of the squeezed region.
Claim 6
Dependent Claim
44 words
The method of forming a shaped metallic article as recited in claim 3 or 4, wherein said squeezing step comprises the steps of inserting a core rod into the pipe and squeezing the pipe while constraining the pipe radially inwardly with said core rod.
Claim 7
Dependent Claim
44 words
The method of forming a shaped metallic article as recited in claim 1, comprising, after said upsetting and bending steps and before said rolling step, the step of releasing one of said punches from the blank before the dies are separated from the blank.
Claim 8
Dependent Claim
22 words
The method according to claim 6, further comprising the step of ejecting the blank after the dies are separated from the blank.
References Cited (Backward Citations)
US1104088A
Cited
US1152858A
Cited
US1946117A
Cited
US2165472A
Cited
US2472261A
Cited
US2743500A
Cited
JPS4924337A
Cited
US4030172A
Cited
GB2068857A
Cited
SU1245391A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |