Metal working – Method of mechanical manufacture – Shaping one-piece blank by removing material
Patent
1997-07-15
2000-04-04
Bryant, David P.
Metal working
Method of mechanical manufacture
Shaping one-piece blank by removing material
29557, 72356, B23P 1304
Patent
active
060445432
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention involves a process for manufacturing a steering joint housing equipped with a molded-on shaft having internal threads to hold an axial journal, in particular for steering tie rods on motor vehicles, made out of a blank which is preferably manufactured from wire material and has a ball-shaped enlargement on one end.
BACKGROUND OF THE INVENTION
To manufacture steering joint housings intended for steering tie rods on motor vehicles, it is known in practice to manufacture a blank from wire material which has a ball-shaped enlargement on one end. After heating, this blank is forged into a steering joint housing with a molded-on shaft in several sequential steps. To complete the steering joint housing, it is necessary to expensively machine out the steering joint housing not only so that it can hold both a bearing shell, which supports the corresponding steering joint ball, and a cover enclosing the inside of the housing, but also so that an axial drilled hole provided with a long threaded section can be brought into it, for holding an axial journal, by which the steering joint housing is attached to the steering tie rod. Along with the heating and the sequential forging processes, the expensive machining both of the steering joint housing and especially of the molded-on shaft is time-intensive and costly.
The purpose of the invention is to create a process of the type named above for manufacturing a steering joint housing with a molded-on shaft, which is considerably more cost effective and especially requires less of an expenditure of energy and materials.
SUMMARY OF THE INVENTION
The purpose is achieved in that the invention uses a cold forming process for the entire manufacture, where first an axial recess having a diameter exceeding the diameter of the internal threads and a length exceeding the axial length of the threaded area is manufactured in the shaft of the blank using reverse cup extrusion, and then the threaded area only is reduced to the thread root diameter under simultaneous forming of the sheath surface into a key surface, and then both the outer contour and the inner contour of the steering joint housing are manufactured, by settling, cupping, drilling holes (and in the process, shearing off of the material waste) and calibrating done crosswise to the axle direction in the area of the enlargement.
By the process according to the invention, which occurs completely without heating, on the one hand, the time-intensive and costly manufacture of a long axial drilled hole and of a long threaded section in the shaft of the steering joint housing is avoided, since only the reduced thread root area, which has a short length, must be provided with internal threads because the axial recess manufactured by reverse cup extrusion in the first process step has a larger diameter than the root diameter, so that the recess connecting to the threaded area in the direction toward the steering joint housing can hold the axial journal used in the attachment of the steering joint housing to a steering tie rod. On the other hand, the machining down, required until now, of both the inner and the outer contour of the steering joint housing, becomes unnecessary due to the calibration of the steering joint housing, so that on the whole, a considerably smaller manufacturing expense results by the process according to the invention. This is accompanied at the same time by reduced costs and shortened manufacturing time. In contrast to the forging operations required up to now, the process according to the invention can be automated so that the costs for the manufacture of steering joint housings provided with a molded-on shaft can be reduced considerably. In addition to cutting threads at considerably reduced lengths, it is merely necessary, in the process according to the invention, to turn a snap ring groove for the attachment of a bellows-type seal, if necessary, or, in the area of later housing covers, to turn a ring-shaped projection which holds the housing cover by caulking.
Provid
REFERENCES:
patent: 3314277 (1967-04-01), Hopkins et al.
patent: 3361457 (1968-01-01), Aldinger
patent: 3897616 (1975-08-01), Williams
patent: 3988818 (1976-11-01), Allison
patent: 4087188 (1978-05-01), McEowen
patent: 4202082 (1980-05-01), Williams
patent: 5087131 (1992-02-01), D'Andrea
patent: 5129251 (1992-07-01), Takikawa
ISBN 3-88355-213-5, 4 Pages, 1995 by DGN Informationsgesellschaft.mbH.
DIN8583, DK 621.735.043:621.983:001.4 Deutsche Normen, Mai 1970, 11 Pages.
Maschinenmarkt.Wurzburg98 (1992) Grenzen uberwunden, 3 Pages.
Maschinenmarkt.Wurzburg 97(1991) Nabe einer Fahrzeug-Freilaufkupplung in sieben Arbeitsgangen kaltumformen, 4 Pages.
Drahtwelt 2--1976, pp. 67-70, Kalt-und warmgepresste Formteile mit anschliebender spanender Nachbearbeitung (1).
Maschinenmarkt.Wurzburg 99 (1993) 14, pp. 22-28, Kosten senken.
Werkstatt und Betrieb 126 (1993) 10, pp. 615-618, Achszapfen durch Halbwarmfliesspressen kombiniert mit Kaltfliesspressen fertigen.
Dorth Harald
Rosenberger Klaus
Stelljes Horst
Bryant David P.
Cozart Jermie E.
TRW Fahrwerksysteme GmbH & Co. KG
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