Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Patent
1986-12-05
1990-04-24
Crane, Daniel C.
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
72 17, 72135, 72175, B21D 708, B21B 3702
Patent
active
049189581
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an improved method of bending conical wire, and also to a new apparatus for the performance of said improved method.
DESCRIPTION OF THE PRIOR ART
It is known in the art to coil wire into bobbins for the purpose of transportation or storage. Also known are bending devices which can be used for wire. Generally, a straight wire is guided into the device, bent into a circular shape onto a revolving plate, spool or the like, and forms a cable bobbin thereon.
These kind of devices fail when the wire does not have a constant cross section, as is the case, for example, of coil springs with progressive or diminishing spring characteristics. Reference here is to wire intended for coil springs with progressive spring characteristic, which is only subsequently divided into longitudinal sections which are used when winding the individual springs. Wire which has two or more longitudinal sections, with varying cross sections, becomes flattened without alteration of the setting of the bending machine and thus becomes unsuitable for transport and further processing. Preferably, the manufacture of this wire with variable smaller and larger diameter should result by dish means.
Adjusting the setting of the bending machine to each cross section and its moment of inertia, as well as to the yield point of each wire material that requires bending, is mathematically very difficult and requires a great amount of electronic expenditure.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to provide a novel method by which wires, having varying cross sections along their length, can be wound into a ring shaped coil or bobbin, and an apparatus which can perform the novel method herein described.
DESCRIPTION OF THE METHOD
The method is based upon the knowledge that a switching mechanism, theoretically a step function, meaning, in other words, a sudden transition from the corresponding flexure of the larger cross section wire to the flexure corresponding to the smaller cross section wire, is sufficient for bending a transportable wire bobbin. The switching from the smaller to the larger diameter of the wire may be effected in two steps for sequentially arranged cylindrical wire sections with a very large discrepancy in diameter. A time delay device, e.g. a throttle or pressure regulating valve, can be designed in the hydraulic drive means which extends the time of the switching process, thereby preventing a kink in the wire.
The preferred embodiment for spring wires used with automobiles can be of the type, for example, where the wire has conical lengths of not more than 2 meters, and whose coils have a diameter of under 3 meters.
The time for switching the amount of bending from one corresponding to the wire with the major diameter to the amount suitable for the wire section with the minor diameter is chosen at a point, when the section of the wire with increasing or decreasing diameter is passing between the bending rollers. The length of this section is taken as 100%. The degree of bending is switched as 20% to 60% of that length, measured from the end of said cylindrical section with the smaller diameter. The length of the conical section is stored in a control unit. When the transition of the cylindrical section with the minor diameter to the conical section is passing the feeler rollers (measuring device) a signal is given to the control unit. A time delay is calculated in the control unit with regard to the distance between the feeler rollers and the bending rollers and to the speed of advance of the wire. The degree of bending is switched, when that range of the conical section, namely 20 to 60% of the conical length, measured as above, is passing the bending rollers. If the feeler rollers indicate the transition from the cylindrical section with the major diameter to the conical section the switching in the degree of bending is effected, when 40 to 80% of the conical length have passed the bending rollers, i.e. 20 to 60% measured from the opposite end of the conical se
REFERENCES:
patent: 3640112 (1972-02-01), Meyfarth et al.
patent: 3859830 (1975-01-01), Jeuken et al.
patent: 4164133 (1979-08-01), Damman
patent: 4412438 (1983-11-01), Tjushevsky et al.
Fangmeier Ralf
Glomb Reiner
Crane Daniel C.
Kieserling & Albrecht GmbH & Co.
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