Metal deforming – By application of fluent medium – or energy field – Using fixed die
Reexamination Certificate
1999-07-26
2001-09-11
Jones, David B. (Department: 3725)
Metal deforming
By application of fluent medium, or energy field
Using fixed die
C072S061000
Reexamination Certificate
active
06286351
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tool engraving of a deformation tool for deforming with an active medium, wherein the tool exhibits a pressure medium feed line for the active medium and an engraving corresponding to the final contour of the work piece and wherein liquid or gaseous pressure agents are employed as an effective medium.
2. Brief Description of the Background of the Invention Including Prior Art
The deformation of the wall of the work piece relative to the engraving of the tool is performed by the pressure of the pressure medium in connection with the generic deformation methods in case of hydrodeforming (compare for example German printed patent document DE 4434799 A1) as well as in case of internal high-pressure deforming (compare for example German printed patent document DE 19535870 A1 and A. Notrott: Neuere Entwicklungen in der Blechumformung; K. Siegert: Neuere Entwicklungen beim Innenhochdruckumformen . . . , 1998, Publisher MAT-INFO Werkstoffinformationsgesellschaft mbH, S. 365-367). During removal of the work piece, the pressure medium can pass to the engraving of the tool, whereby no contact between engraving and wall of the work piece occurs during metal forming of the following workpieces in that region, where the pressure agent adheres to the engraving, whereby undesired deformations occur at the tool piece. These deformations cause limitations in the evaluation of the surface quality of the work piece. Bubble formations between sheet metal or thin foils to be deformed and the engraving can occur also in connection with gaseous active media, whereby again undesirable deformations of the workpieces are generated.
SUMMARY OF THE INVENTION
1. Purposes of the Invention
It is an object of the present invention to prevent deformations of the work piece by the active medium as well as to improve the surface quality and simultaneously to obtain defined surface properties of the work piece.
It is another object of the present invention to furnish microengraved work pieces.
It is yet a further object of the present invention to furnish an engraving tool capable of impressing microstructures.
These and other objects and advantages of the present invention will become evident from the description which follows.
2. Brief Description of the Invention
According to the present invention microstructures are incorporated in the engraving of the tool. These microstructures should not negatively influence to the surface quality of the tool and should be suitable to receive the pressure medium adhering in the engraving during the pressing on of the work piece and to oppose at deformation by a local damming or congestion of the pressure medium between engraving and work piece. Furthermore there exists the possibility to purposefully influence the surface structure of the workpiece by the microstructures, such that for example of more uniform metal forming occurs and better adhering properties are assured for a next following coating.
The microstructures should have a dimension in the order of magnitude of the size of a molecule of the pressure medium up to 100 micrometers breadth and 100 micrometers depth or height. The microstructures can have desired arbitrary forms and can be disposed at the same or different distances relative to each other or they can join into each other and for example form line structures, meander like structures or punctual shaped structures. The microstructures can be disposed over the whole face of the engraving of only be disposed at certain defined positions (for example in radial elements), if only at the locations there exists the danger of a deformation, or if only at certain surface regions of the work piece particular surface properties are desired (for example adhering properties and friction properties).
The novel features which are considered as characteristic for the invention are set forth in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawing.
REFERENCES:
patent: 4581913 (1986-04-01), Reed
patent: 5592840 (1997-01-01), Miyasaka
patent: 5647239 (1997-07-01), Fischer
patent: 5649438 (1997-07-01), Hall, Jr. et al.
patent: 5671628 (1997-09-01), Halila et al.
patent: 6016603 (2000-01-01), Marando et al.
patent: 6041633 (2000-03-01), Bieling
patent: 44 34 799 A1 (1994-09-01), None
patent: 44 36 437 A1 (1994-10-01), None
patent: 195 35 870 A (1995-09-01), None
patent: 29617276 (1998-03-01), None
patent: 4-294831 (1992-10-01), None
Dr. Meleghy Hydroforming GmbH & COKG
Jones David B.
Kasper Horst M.
LandOfFree
Tool engraving of a deformation tool for deforming with an... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tool engraving of a deformation tool for deforming with an..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tool engraving of a deformation tool for deforming with an... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2479930