Forming tool and method for enlarging an opening by means of an enlarging device
A technology for forming tools and expanding openings, applied in the field of forming tools, can solve the problems of tool failure, high cost, uneconomical, etc., and achieve the effects of reducing processing costs, improving flow performance, and uniformly extending the area
Inactive Publication Date: 2015-07-22
AIRBUS DEFENCE & SPACE
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- Application Information
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Problems solved by technology
Furthermore, the use of casing such as is practiced in the split casing method makes the method costly and uneconomical
Furthermore, problems arise again and again due to premature failure of the tooling (especially cold welding between the mandrel and the component in the split mandrel method)
Method used
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[0076] exist figure 1 An embodiment of a forming tool 10 is shown in FIG. The forming tool 10 has an enlarging device 12 and a drive element 14 which can be introduced into an inner bore 16 of the enlarging device 12 .
[0077] as in figure 1 and 2 As shown in FIG. 2 , the drive element 14 is configured as a spindle 18 comprising a first section 20 and a second section 22 . The first section 20 has a polygonal cross-section viewed in the radial direction R. As shown in FIG. The first section 20 is conically shaped in the axial direction A towards the first end 24 of the mandrel 18 .
[0078] In the exemplary embodiment, the mandrel 18 is designed as a square mandrel, wherein other polygonal designs are also conceivable. The outer surface of the mandrel 18 is designed as a functional surface 26 , wherein the angle α between the central axis M and the functional surface 26 results in a conicity of the mandrel 18 .
[0079] Ideally, the angle α is between 0.3 and 3 degrees....
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Abstract
A forming tool for widening an opening includes an expanding device with several expansion elements. The expansion elements are each provided with a curved forming surface extending between two peripheral end edges. The expansion elements are moveable between a first position corresponding to a contracted state where the expansion elements in connection with one another by way of separating surfaces, and a second position corresponding to a widened state where the expansion elements are displaced in radial direction from a center of the expanding device such that the separating surfaces are spaced apart from one another. In the first position the peripheral end edges are spaced further apart from the center than a central region of the forming surfaces so that the fatigue strength of mounting bores can be increased, openings in thick-walled components can expanded more reliably, and / or the formation of cracks is avoided.
Description
technical field [0001] The invention relates to a forming tool for enlarging an opening by means of an enlarging device. Furthermore, the invention relates to an enlarging element for use in a forming tool according to the invention and a method for enlarging an opening. Background technique [0002] In aeronautics, it is particularly desirable to enlarge highly loaded mounting holes in metal components by forming methods. This is mostly achieved by means of cold working. Due to the plastic deformation of the material in the region of the holes, internal stresses are generated which contribute to an improved fatigue strength. In this case, the expansion of the extension region is dependent on the applied elongation and corresponds, for example, to almost doubling the original diameter when the original diameter is enlarged by approximately 3%. [0003] Various shaping methods are known from the prior art, which are also referred to as expansion methods. All methods known...
Claims
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IPC IPC(8): B21D39/20B21D41/02B23P9/02
CPCB21D39/20B21D31/04B21D41/028B23P9/025
Inventor E.里泽
Owner AIRBUS DEFENCE & SPACE