Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1995-12-28
1997-04-15
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
29894362, 72 85, B21H 100
Patent
active
056198795
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the non-cutting production of a hub of a transmission component possessing the hub from a sheet metal blank.
Transmission components designed as gear rings or designed as belt pulleys, especially poly-V-belt pulleys, are used in large numbers in automobile construction and nowadays they are often produced, starting from a round plate, by spinning methods. The formation of the toothings and/or the grooves is likewise possible by the spinning method, whereas the fitting of the necessary hub presents difficulties. The actual hub is, in the region of the axis of rotation, a sleeve-shaped part of the rotating pulley, said sleeve-shaped part making the connection with the pushed-through shaft or axle or with a journal.
Such a component is represented and described by way of example in U.S. Pat. No. 2,696,740.
The hub of a transmission component is produced, in the state of the art, by connecting a prefabricated cylindrical sleeve part to the transmission component, conventionally four methods being employed for the connection, namely, on the one hand, soldering of the two components, welding of the two components, the connection of the two components by frictional welding and, finally, it is possible also to produce the transmission component by means of a forging method.
The three first-mentioned procedures have the disadvantage that an adverse influence on the actual transmission component occurs as a result of the absolutely essential heat treatment, and, when welding takes place, subsequent machining of the weld seam is required. The cost outlay for producing the hub as a lathe-turned part is relatively high.
The distortion of the transmission component caused by the heat treatment must subsequently be removed again by means of certain machining methods.
The reject rate of transmission components from such a production line which are not true-running is very high.
The use of forged transmission components is cost-intensive and, moreover, an undesirable metal hardening occurs, that is to say the structure is changed, so that the subsequent application of the profilings of the transmission component, whether as a gear ring or as grooves for belt pulleys, becomes extremely difficult. Finally, the surface of this transmission component scales, thus necessitating additional machining steps.
In summary, therefore, it can be stated that the previous outlay for fixing a hub to a relatively small transmission component is very high, that the reject rate during manufacture is high, and undesirable influences on the material occur which may be detrimental to the useful life of the transmission component.
It is known from the literature reference "Blech, Rochre, Profile 1980" ["Sheet Metal, Tubes, Profiles 1980"], page 660, to produce outer disk carriers as a sheet-steel formed part, these outer disk carriers being manufactured in two pressing passes. Altogether, 27 processing steps are required to produce such an outer disk carrier. They comprise 10 drawing, 7 calibrating, ironing and 7 cutting operations as well as 1 upsetting operation. As a result of the drawing work, the structure is torn apart, that is to say the material structure is fatigued. Moreover, drawing operations are normally associated with inaccuracies which can have an adverse effect in the case of a transmission component.
The object on which the invention is based is to simplify the method of the relevant generic type and to carry it out in one work cycle, without undesirable influence on the material structure of the transmission component occurring.
This object on which the invention is based is achieved by means of the teaching of the main claim.
A device for carrying out this method is explained in the subclaim.
This object on which the invention is based is also achieved by means of the teaching of patent claim 3. A device for carrying out the method is explained in subclaims 5 and 6.
In other words, in contrast to the state of the art, and excluding the already mentioned forging methods and drawing methods
REFERENCES:
patent: 1108260 (1914-08-01), Slick
patent: 1500261 (1924-07-01), Page
patent: 2624303 (1953-01-01), Ghormley
patent: 2696740 (1954-12-01), Zatko
patent: 3120206 (1964-02-01), Sporck
patent: 4056291 (1977-11-01), Kraft et al.
patent: 4996859 (1991-03-01), Rose et al.
"Blech, Rohre, Profile 1980" [Sheet Metal, Tubes, Profiles 1980], p. 660.
Larson Lowell A.
WF-Maschinenbau und Blechformtechnik GmbH & Co. KG
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