Metal working – Plural diverse manufacturing apparatus including means for... – Including composite tool
Patent
1989-08-15
1994-05-10
Gorski, Joseph M.
Metal working
Plural diverse manufacturing apparatus including means for...
Including composite tool
29 33K, 29565, 2924357, 29DIG3, 292435, 72382, B24D 3902
Patent
active
053096223
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a pressing tool for the production of multilayer formed plates with at least two outer layers. The pressing tool includes a tool lower part, a tool upper part, guide columns and a coupling device for driving the press. The lower part of the tool has a die with a forming hollow corresponding to the formed plate. The upper part of the tool has a pressing stamp fitting the forming hollow. The invention also relates to a process for the operation of such a pressing tool.
BACKGROUND ART
Pressing tools of this kind are generally known and are used, for example, in areas of sheet metal working, especially in the vehicle industry. The flat objects formed with these tools may include flat, curved or any desired combination of flat and curved surfaces. Multilayer formed plates which include, for example, two outer layers of sheet metal and an intermediate layer of insulation material, must be produced with several tools and in several work steps. The production of such multilayer formed plates is known in which a metal sheet, a covering foil, and the intermediate layer of insulation material are cut to the desired outer form. Each is prepared in separate work steps into a flat surface. These cut pieces are laid, in the desired construction order, into the forming hollow of a pressing tool and pressed into the desired form. Both outer layers of metal are cut larger than the insulation layer to produce a perfect joining in the rim portion of the formed plate between the individual layers of the formed plate. A metal cover foil overlaps the outer layer lying opposite. After the end of the form process, the metal cover foil must be laid manually around the outer layer lying opposite and pressed against the latter. Formed plates of this kind are used, for example in vehicle construction, as motor or exhaust pipe coverings. The production process described which requires, on the one hand, several tools, and on the other hand, a final manual finishing, is extremely costly and time-consuming. The use of automatic finishing instead of manual finishing of the rims is only possible to a limited extent, namely, only where a large enough number of pieces are needed. This is because multilayer formed plates of this kind have rim portions which are bent or curved in all spatial directions.
SUMMARY OF THE INVENTION
The invention addresses the problem of providing a pressing tool with which the layers of the formed plate may be formed, the edge portions of the outer layers trimmed as necessary, and with the same tool, the rim portion of one outer layer laid around the rim portion of the other outer layer, and the rim portions pressed together. The tool should make possible the production of multilayer formed plates without manual finishing and should be simple and economical to produce.
This problem is solved, according to the invention, by the fact the rim around the forming hollow includes side walls having two portions with different inclination toward the forming surface of the forming hollow. The first side wall portion abuts directly against the forming surface and is perpendicular to this forming surface. The second upper side wall portion diverges outward. The upper part of the tool has a frame, movable along and arranged coaxially around the pressing stamp. A coupling device is arranged between this frame and the pressing stamp. Springs elastic elements are fastened to the Frame. The free ends of these spring elastic elements cooperate with the second diverging side wall portion of the forming hollow.
In another embodiment of the invention, the two side wall portions of the forming hollow run parallel to the curvature of the rim line of the forming surface. The free ends of the spring elastic elements form a line running parallel to the second upper side wall portion.
To allow the cutting of the rim portion of the outer layer of the formed plate, according to another embodiment of the invention, the lower part of the tool has the cutting plate arranged around the forming hollo
REFERENCES:
patent: 1294486 (1919-02-01), Kuen
patent: 2041004 (1936-05-01), Levan
patent: 2422952 (1947-06-01), Dakin
patent: 2576698 (1951-11-01), Russum
patent: 3387355 (1968-06-01), Herring
patent: 3540116 (1970-11-01), Drahos et al.
patent: 3699626 (1972-10-01), Roth
AAW Produktions Aktiengesellschaft
Gorski Joseph M.
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