Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1982-01-26
1984-06-26
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72105, 72370, B21D 2214, B21D 2218, B21D 1504
Patent
active
044558520
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to metalforming technique and is specifically concerned with methods for producing shapes having circular corrugations from sheet metal blanks by the spinning process.
BACKGROUND ART
Corrugated disk-typed shapes are presently produced from sheet metal mainly by stamping. With this technique, however, a blank is subjected to deformation over the entire surface simultaneously, which requires considerable forces. In addition, producing shapes having deep corrugtions involves the use of a set of dies with progressively increasing depth of impressions and necessitates annealing between operations. This entails a high power consumption with a rather low productive capacity.
There is also known a method for producing shapes having circular corrugations, wherein the corrugations are spinned by acting upon a sheet metal blank with oppositely directed deforming and backing forces (USSR Inventor's Certificate No. 441,068, issued Aug. 30, 1974 Int. Cl. B21 D 13/10). In this method, disks having sawtooth-section corrugations are produced from blanks in the form of the development of a cone. Such a blank is deformed at the points of apices of all the corrugations over one of radial sections of the blank; the process proceeds by progressively extending the zone of deformation and passing from one radial section to another. A corrugated disk thus produced has an unclosed surface, which will necessitate an additional operation of joining and fastening together edges of a complex contour and hence involve additional labour and power consumption. Moreover, accomplishing this method calls for an apparatus with shaping members (spinning tools) capable of varying the distance with respect to one another; this entails a constructional complexity of the apparatus and tooling to practice the method.
The invention is based on the problem to provide a method for producing shapes having circular corrugations from sheet metal, which method makes it possible to produce such shapes with a broad range of dimensions and substantially any depth of the circular corrugations through changing the configuration of a blank by acting thereupon with a concentrated deforming force and offers at the same time low labour and power consumption.
DISCLOSURE OF INVENTION
The problem is solved by the provision of a method for producing shapes having circular corrugations through forming the corrugations by the spinning process which involves acting upon a sheet metal blank with oppositely directed deforming and backing forces, in which method the blank is given the configuration of an envelope of revolution with a continuously diverging flare and is secured at the end nearest to the geometrical apex of the flare, and the circular corrugations are formed sequentially from the smaller towards the larger diameter of the blank by applying a concentrated deforming force to the inside surface of the blank, the deforming forces being applied along the axis of the blank.
Such a method for producing shapes having circular corrugations offers a low power consumption, inasmuch as a blank in the form of a flare readily lends itself to bending (turning out) at the points of application of the deforming and backing forces, i.e. at the areas of forming the circular corrugations. The same fact accounts for the simplicity of the method and possibility of forming corrugations with essentially any depth.
The small deforming forces in turn lower the requirements placed upon the construction of the tooling needed to accomplish the method and reduce the metal content of the latter.
Owing to the fact that the process involves predominantly a bending deformation, the surface quality of formed circular corrugations is close to that of the blank.
Finally, one of the prime attractions of the proposed method lies in that the corrugated disks produced, when acted upon by external forces (such as pressure), can take a configuration close to that of the blank, which is essential for displacing diaphragms of fuel systems.
It is advis
REFERENCES:
patent: 602926 (1898-04-01), Zuhlke
patent: 1456069 (1923-05-01), Mallory
patent: 1711075 (1929-04-01), Zimmerman
patent: 3444589 (1969-05-01), Bowin
Balitsky, deceased Vladimir M.
Ivaschenko Grigory P.
Krasjukov Alexandr V.
Paton Boris E.
Samilov Vladimir N.
Institut Elektrosvarki Imeni E. O. Patona
Larson Lowell A.
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