SUPERPLASTIC FORMING OF SANDWICH PANEL

A method for making a metallic sandwich panel, in which the cost of the forming dies is reduced relative to prior art methods, machining to adjust the sheet thickness of the face sheets after shaping is avoided, freedom in the design of the panel is made possible, and panels having smooth outer surf...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	TAKAYUKI TSUZUKU
Format:	Patent
Sprache:	eng
Schlagworte:	MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A method for making a metallic sandwich panel, in which the cost of the forming dies is reduced relative to prior art methods, machining to adjust the sheet thickness of the face sheets after shaping is avoided, freedom in the design of the panel is made possible, and panels having smooth outer surfaces can be produced. According to the invention, a work piece (6) is formed by disposing a core sheet (1) between face sheets (2) and bonding the sheet (1) with the sheet (2) in a zig-zag pattern. Dummy sheets (4) are superposed on the outside of the face sheets (2), a fluid pressure is applied between the sheets (1 and 2) of the work piece (6) to shape the latter jointly with the dummy sheets (4), which sheets are effective to increase the deformation resistance and are removed after shaping. The dummy sheets serving to prevent creases or recesses in the facing sheets (2) during superplastic deformation.