Metal fusion bonding – Process – Using dynamic frictional energy
Patent
1994-12-02
1996-03-05
Ramsey, Kenneth J.
Metal fusion bonding
Process
Using dynamic frictional energy
228125, B23K 2012
Patent
active
054959772
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a bobbin for fibrous wound material, said bobbin having two flanges that are connected to one another by a core tube, and to a method for producing such a bobbin.
DE 39 08 223 C2 discloses a bobbin for fibrous wound material having the two symmetrically divided bobbin halves made of a light metal alloy being fixedly connected to each other by a frictional welding seam at their central core tube end faces bluntly abutted upon each other. For this purpose, the bobbin halves are produced by extruding requiring, however, relatively expensive extrusion tools. Furthermore, manufacturing the extrusion tools needs a relatively long time and causes high initial costs. In addition, the shape of the bobbin is subject to geometrical limits determined by the extrusion process. For example, producing the bobbin flanges above a predetermined diameter, e.g. >100 mm, is problematic since the wall thicknesses of the bobbin flanges are very small, as compared with the relatively large diameter.
Furthermore, storage of the bobbin halves produced as extrusion parts is relatively expensive since they may be stacked rather badly and need a lot of space. Furthermore, even slight changes in the bobbin shape, e.g. a reduced axial length, cause very complex changes at the extrusion tool such that in view of the high tool costs this process is economical essentially only for large numbers. However, for smaller numbers and a flexible production this process is rarely suitable.
The situation is similar for the bobbin of DE-OS 16 02 319 whose bobbin halves are formed as molded parts subsequently connected to each other by inert gas welding. Again, relatively high initial costs for the molds are necessary which prevents an economical production for small batches.
Furthermore, FR-A-11 30 583 discloses a bobbin made of light metal having a core tube completely inserted in two bobbin flanges followed by soldering along the exterior periphery. However, a homogenous connection cannot be achieved such that the connection seam tends to break in the corner region in view of the high axial loading of the bobbin flanges during winding-up. Furthermore, the interior diameters of the bobbin flanges and the exterior diameter of the core tube in the engaging region must be manufactured very exactly; otherwise, the result would be a weakening of the connection seam.
Furthermore, GB-A-825 540 discloses a three-part bobbin formed of metal sheet pressing parts subsequently welded together at the exterior periphery of the core tube. In this connection, it is rarely possible to achieve a uniform welding-through such that the strength is low.
Accordingly, it is the object of the invention to provide a bobbin for fibrous wound material which may be produced simply and cost-effectively even in small numbers and has a particularly high strength. There shall be provided a corresponding manufacturing method therefor.
This object is solved by the bobbin and method of manufacturing same, of the present invention.
In view of the design of the bobbin made of several parts the individual parts, in particular the flat annular bobbin flanges, may be relatively easily produced with any desired diameter, in particular by lathe processing. In the simplest case the bobbin comprises a core tube and two bobbin flanges which are produced on the lathe from corresponding raw parts, i.e. tubes, by cutting-off or separating. Therefore, changes in the geometry of the bobbin, for example a longer core tube, may be made by simply setting the lathe. Therefore, changes of tools or molds are no more necessary.
Furthermore, storing is decisively reduced since neither tools nor various starting materials need to be stored. In contrast, a plurality of differently dimensioned bobbins may be produced by means of a very small number of raw parts, e.g. extruded tubes each for the core tube and the bobbin flanges. Consequently, the initial costs are drastically reduced, as well as the delivery time for special types of bobbins.
It is of particular importance to arrang
REFERENCES:
patent: 1589414 (1926-06-01), Mossberg
patent: 1732817 (1929-10-01), Mossberg
patent: 1842143 (1932-01-01), Bowen
patent: 3144710 (1964-08-01), Hollander et al.
patent: 4832769 (1989-05-01), Shantz et al.
Hildebrandt Dieter
Prechtel Michael
Hildebrandt-Spulen-Bobbins GmbH
Linden Gerald E.
Ramsey Kenneth J.
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