US3889512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steering knuckles and method of forming the same
Assignee: Individual
•
Filing: 1974-03-13
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Granted: 1975-06-17
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Expires: 1994-03-13
Abstract
Abstract A novel forging process by which forged steering knuckles having improved toughness are produced. The method comprises splitting an elongated steel billet over the web of a buster die to provide material for the support legs by pressing the billet against the web with a mating die having a cavity which permits controlled flow of the hot steel in the opposite direction to produce a boss from which the spindle will be made. The saddle-shaped blank thus produced is layed on its side within a blocking die and pressed in a direction normal to said first flow of material to block the knuckle blank out and move excess material into a margin of peripheral flashing. A third and then a final fourth die pressing step gives the steering knuckle forging its final dimensions and trims the flashing from the blocked out blank.
Inventors
- 👤 Ralph D Delio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:53
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/74
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
352 words
A method of press forging steering knuckles comprising the procedural combination of steps of: orienting one end of a heated elongated steel billet adjacent a narrow tapered central web portion projecting from a base of a first one of a first pair of dies such that said billet extends laterally beyond each side of said web over pockets defined by each of the sides of said web, said base and generally transverse walls at either end of said web, said one end extending generally parallel to said base; pressing said billet axially in a direction generally perpendicular to said one end and said base by means of shallower surfaces defining the cavity of the second mating die of said pair to split the end portion of said billet and cause the web relatively to move axially and longitudinally into said billet as steel of the billet simultaneously flows into said pockets and to said base in one direction and in the opposite direction toward and to the deeper surfaces defining the cavity of said second mating die to form a saddle-shaped blank having one leg in each pocket and an oppositely extending boss ending at the deepest surface of said mating die; removing the saddle-shaped blank from said first pair of dies and orienting said blank on its side in one die of a second pair of mating dies; pressing said blank in said second set of mating dies in a direction normal to said first axial pressing to block out said steering knuckle and to move excess steel laterally to form a surrounding integral flashing; removing said blocked out steering knuckle from said second set of dies and orienting it on its side in one die of at least a third pair of mating dies which define a cavity substantially the shape and dimension of the desired finished steering knuckle forging; pressing said third set of dies together to press forge the blocked out steering knuckle to proper size; removing from the forging any flashing remaining and thereby providing a steering knuckle forging of the desired size, shape and grain structure.
Claim 2
Independent Claim
352 words
A method of press forging steering knuckles comprising the procedural combination of steps of: orienting one end of a heated elongated steel billet adjacent a narrow tapered central web portion projecting from a base of a first one of a first pair of dies such that said billet extends laterally beyond each side of said web over pockets defined by each of the sides of said web, said base and generally transverse walls at either end of said web, said one end extending generally parallel to said base; pressing said billet axially in a direction generally perpendicular to said one end and said base by means of shallower surfaces defining the cavity of the second mating die of said pair to split the end portion of said billet and cause the web relatively to move axially and longitudinally into said billet as steel of the billet simultaneously flows into said pockets and to said base in one direction and in the opposite direction toward and to the deeper surfaces defining the cavity of said second mating die to form a saddle-shaped blank having one leg in each pocket and an oppositely extending boss ending at the deepest surface of said mating die; removing the saddle-shaped blank from said first pair of dies and orienting said blank on its side in one die of a second pair of mating dies; pressing said blank in said second set of mating dies in a direction normal to said first axial pressing to block out said steering knuckle and to move excess steel laterally to form a surrounding integral flashing; removing said blocked out steering knuckle from said second set of dies and orienting it on its side in one die of at least a third pair of mating dies which define a cavity substantially the shape and dimension of the desired finished steering knuckle forging; pressing said third set of dies together to press forge the blocked out steering knuckle to proper size; removing from the forging any flashing remaining and thereby providing a steering knuckle forging of the desired size, shape and grain structure.
Claim 3
Dependent Claim
34 words
The method of claim 1 in which the steps of pressing the third set of dies together and removing from the forging any flashing remaining are accomplished by a fourth set of trimming dies.
References Cited (Backward Citations)
US2337222A
Cited
US3160479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |