Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work
Patent
1997-06-17
1999-09-28
Jones, David
Metal deforming
By application of fluent medium, or energy field
With actuated tool engaging work
723671, 7237003, 7237015, 72377, B21D 3100
Patent
active
059569883
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for heading pipe ends. A device is also proposed for application of the process.
Tubular machine components such as exhaust gas systems for internal combustion engines have up to the present been made predominantly with pipes of uniform cross-sectional dimensions.
Parts of such components with cross-sectional dimensions modified as required by the function involved are customarily inserted into the component by means of flanges, welds, or other methods, for example, for the purpose of fastening particular machine elements or components. Such components and machine elements may be, among other things, sound absorbers, catalytic converters, or connecting flanges.
The consequence of a procedure such as this is represented by high manufacturing cost and, in addition to lengthy manufacturing periods, by more or less function-impairing disruptions of the flow pattern resulting from additional unevennesses of the interior wall of the tubular component group.
An attempt is usually made to eliminate these consequences by dimensioning the cross-sections of the pipes to be used on the basis of the highest mechanical and/or thermal stresses to be anticipated, this necessarily entailing additional consumption of material and needlessly high product weight.
This procedure also results in the disadvantage that necessary reshaping processes, such as ones employed in manufacture of pipe bends, must be carried out under difficult conditions.
U.S. Pat. No. 5,203,194 discloses a process for manufacture of a trailer coupling for motor vehicles. An end section of a shaped piece square in shape is formed by introduction of axial pressure. No particular quality requirements are set as regards dimensional accuracy or a uniform interior wall promoting flow after the modification of the shape.
The object of the invention is to develop a process for heading pipe ends and a device for application of the process by means of which a tubular structural element with more or less optimum cross-sectional dimensions may be provided with end sections of increased cross-sectional dimensions such that the interior diameter remains unchanged, with virtually no transitional area even in the area of the end of the pipe, while the necessary cross-sectional dimensions nevertheless remain available for the addition of components such as connecting flanges, sound absorbers, catalytic converters, and the like. Solution of the problem accordingly requires a technique by means of which the reshaping desired can be accomplished efficiently and with thermal overstress prevented to the greatest extent possible.
It is claimed for the invention that the problem is solved by a process in which the pipe end is headed axially and is reinforced circumferentially in the radial direction.
It may be pointed out in this connection that DE 88 09 031 U1 proposes a device for reshaping metal pipe pieces, a device in which the shaping die required is in the form of a hydraulic molding system with at least four parts and also having pipe piece mountings. In order to prevent undesirable deformation of the pipe pieces to be reshaped when an axial load is applied, a bearing fluid is introduced into the interior of the pipe by at least one of the axial pistons used.
This technical solution provides no guidance regarding the heading of pipe ends on bent or unbent pipe pieces, since the problem as stated is that primarily widening of pipe pieces is to be accomplished for the purpose of at least partial enlargement of the interior diameter, this necessarily entailing partial reduction of the wall thickness.
The invention also describes an especially well-suited device in which a piston is introduced from the front into the pipe to be headed, this piston forces the pipe end by a suitable shoulder surface in the axial direction from the front of the pipe, while simultaneously pressure is applied through suitable openings to the interior wall of the pipe, for example, by means of a fluid. Supported by the axial pressure, this pressure reinforces t
REFERENCES:
patent: 1882352 (1932-10-01), Woodhead et al.
patent: 2053975 (1936-09-01), Spatta
patent: 2268246 (1941-12-01), Dooley
patent: 3383888 (1968-05-01), Aschberger
patent: 3487668 (1970-01-01), Fuch, Jr.
patent: 4213322 (1980-07-01), Barnes, Jr.
patent: 4557128 (1985-12-01), Costabile
patent: 4845972 (1989-07-01), Takeuchi et al.
patent: 5184495 (1993-02-01), Chunn et al.
patent: 5203194 (1993-04-01), Marquardt
Beste Andreas
Janssen Manfred
Lipowsky Hansjorg
Oswald Jurgen
Audi AG and Fahrzeugwerk Werdau
Jones David
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