Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1993-11-30
1999-03-02
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
29 34R, 72 80, 72177, 148689, 148691, 148415, 148437, 148909, 2421187, 2426104, 2426105, C22F 104, B65H 7514
Patent
active
058765255
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention relates to bobbins and methods of making same and, more particularly, to a bobbin having a cylindrical aluminum alloy body and end flanges of greater diameter than the body, for receiving and winding materials such as synthetic yarn.
BACKGROUND OF THE INVENTION
A bobbin body for thread-form wound material is known from DE 3 908 223 C2, wherein two bobbin body halves of a light metal alloy are fixed together by a friction welded seam at their butted core tube ends. The bobbin body halves are made by flow extrusion, where however the shape of the bobbin body is set by the geometric limits determined by the flow extrusion process, since from a certain diameter of the bobbin flanges, the wall thickness of the end flanges compared with a relatively large diameter is very small so that inhomogeneities can occur in the bobbin body halves and reduce the strength of the bobbin body. The strength of the bobbin body has especial significance, since the end flanges of the bobbin body are pressed out from one another and are thus subjected to high stresses, especially in winding high strength elastic or synthetic yarns.
As well as this, bobbin bodies are known which are welded or screwed together from a plurality of parts, which however allow gaps to occur from bending out of the end flanges, in which the inner turns of the wound material engage and are thus firmly clamped. Moreover, cast bobbin bodies are also known, which are however not able to cope with the stresses which arise, particularly in the transition region between the winding body and the end flanges and thus can break. This danger exists even with bobbin bodies turned from solid material, since notch effects can result from the sharp transition in the corner region between the end flanges and the winding tube and the interrupted course of the fibers and can lead to fracture. This implementation is not suitable for long production runs on account of the costs of the high material usage and the long machining time.
SUMMARY OF THE INVENTION
Accordingly the invention is based on the object of providing a bobbin body and method of manufacture thereof, with which a higher strength of the bobbin body is obtained, at the same time with small production costs.
According to the invention, there is provided a method of making a bobbin body from an aluminum alloy, wherein the bobbin has a cylindrical winding body for receiving wound materials, especially synthetic yarn, and end flanges of greater diameter in comparison therewith, with the following method steps: bobbin blank; excess for making the end flanges;
Further according to the invention, there is provided a bobbin body formed of aluminum alloy, wherein the bobbin body comprises: synthetic yarn, and end flanges with a greater diameter than the winding body, and ends of a cylindrical bobbin blank.
An uninterrupted course of the fibers especially in the critical transition region from the winding body to the end flanges, is obtained from the unitary manufacture of the bobbin body, with shaping of the two ends of a substantially cylindrical bobbin blank, preferably simultaneously. From this results an especially high strength of the bobbin body. At the same time markedly reduced production costs are achieved from the formation of the bobbin body in one piece, since, in contrast to the state of the art, separate parts no longer have to be made and then have to be joined together in time-consuming manner. In addition there is a reduction of the achievable tolerances, since faulty position of the components relative to one another, for example errors in parallelism or axial errors, are avoided, so that the bobbin body can be made accurately to final measurements and with very small excess material for the final fine finishing by turning.
Further advantageous developments are the subject matter of the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Four embodiments of the method of manufacture of a bobbin body are explained in more detail and described bel
REFERENCES:
patent: 3913863 (1975-10-01), O'Malley
Patent Abstracts of Japan, vol. 016, No. 270 (M-1266) 17. Juni 1992 & JP, A, 4066230 (Nissan Motor Co) 2. Marz, 1992.
Database WPI,Section Ch, Week 7216, Derwent Publications Ltd., London, GB; Class FO2, AN 72-25737 & JP, B, 47012542 (Nakajo) 18. Apr. 1972.
Patent Abstracts of Japan, vol. 013, No. 545 (M-902) 6. Dezember 1989 & JP, A, 1224185 (Takashi Funabiki) 7. Sep. 1989.
Lenarcic Davorin
Prechtel Michael
Hilebrandt-Spolen-Bobbins GmbH
Koehler Robert R.
Linden Gerald E.
Simmons David A.
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