Method for the production of axially symmetrical workpieces with or without a toothed profile
Inactive Publication Date: 2010-04-01
CARL DAN PEDDINGHAUS
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Benefits of technology
[0005]Therefore, it is the object of the present invention to develop a method for producing substantially axially symmetrical workpieces, in particular with toothed profiles, which enables more simple, and therefore faster and less expensive processing.
Problems solved by technology
During the shaping processes strong shaping forces occur which bring about stresses with partly extreme fatigue stress peaks in the tools, and this has a negative effect upon the life of the tools, and so upon the cost of the latter.
With axial roll forging too the approach angle of the tool must be held within a precisely controlled range, and further parameters such as the rolling speed must be observed, and this of course makes production even more complicated.
Method used
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Embodiment Construction
[0021]FIG. 1 diagrammatically illustrates a tool design which shows a die 1 and a tool 2 disposed over the latter. The die has a bore 11 through its central axis and a contour in the form of toothed profiling 12 and an edge 13 on the side facing towards the tool. The tool is rotated with a rotation speed n, and the distance a between the tool and the die can be set by a feed movement. The starting material 3 is continuously introduced by a ram (not shown) with a feed speed into the bore 11 (arrow S), from where it is pressed into the space between the contour 12 of the die and the tool 2. By pressing in and rotating the tool acting upon the material, the material flows radially outwards along the contour of the die until it finally fills the mould of the die with material due to the edge 13, and produces the finished workpiece. Here the distance a is also adapted to the quantity of material in the die. The material feed is controlled such that only as much material is pressed in as ...
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Abstract
The method according to the invention for producing substantially axially symmetrical workpieces by shaping a starting material uses a die and a rotatable tool, the die being provided with a bore along the central axis thereof. Here the starting material is introduced through the bore of the die and pressed in between the die and the rotating tool such that the starting material flows outward from the central axis according to the contour of the die. The workpiece is thus produced in a single operation. Depending on the requirements for the dimensional accuracy and surface quality, mechanical finishing or calibrations are possible. Due to the material flow in the die and the rotation of the tool, shaping forces which are only small in comparison to conventional methods occur here, and so the requirements made of the tools, and so the expense, are reduced. Since the shaping takes place without cutting, the resulting fibre flow of the finished workpiece is also advantageous and provides the workpiece with better mechanical properties.
Description
PRIORITY CLAIM[0001]This application claims the benefit of EP-05 015 102.6, filed on Jul. 12, 2005.TECHNICAL FIELD[0002]The present invention relates to a method for the production, without cutting, of substantially axially symmetrical workpieces, in particular workpieces with a toothed profile, and a workpiece produced with the method.BACKGROUND ART[0003]Previous methods known from the prior art which produce axially symmetrical workpieces, such as e.g. crown gears by shaping, without cutting, are characterised above all by the cost-intensive tools which are required. During the shaping processes strong shaping forces occur which bring about stresses with partly extreme fatigue stress peaks in the tools, and this has a negative effect upon the life of the tools, and so upon the cost of the latter.[0004]One can give axial roll forging as an example of this type of conventional method. Here the whole volume of material to be shaped must be placed from the start between the shaping to...
Claims
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Login to View More IPC IPC(8): B21C23/00
CPCB21J5/02B21J5/08B21J5/063B21K1/30B21J9/025
InventorPRUSSAK, MATTHIAS
OwnerCARL DAN PEDDINGHAUS