Page 53 - Module DMV20173

3.0 SHEET METAL PROCESSES

Figure 3.24 Process of manufacturing of bellow.

3.3.8 STRETCH FORMING

1. In stretch forming, the sheet metal is clamped along its edges and then
stretched over a male die (form block or form punch).

2. Fig. 3.30 shows the Schematic illustration of a stretch-forming process.
Aluminum skins for aircraft can be made by this method.
3. In most operations, the blank is a rectangular sheet clamped along its
narrower edges and stretched lengthwise, thus allowing the material to
shrink in width.

4. Most applications require little or no lubrication.

Figure 3.25 Schematic illustration of a stretch-forming process.

BPLK 85 DMV 20173