Selection of materials unit 1

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Selection of materials -unit 1
Selection of materials -unit 1

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Stretch Forming

Stretch Forming

Introduction

Stretch Forming is the forming of sheet, bars, and rolled or extruded sections over a form block of the required shape while the work piece is held in tension. The work metal is often stretched just beyond its yield point (generally 2 to 4% total elongation) to retain permanently the contour of the form block.

The four methods of stretch forming are:
· Stretch draw forming (Fig. 1 a and b)
· Stretch wrapping, also called rotary stretch forming (Fig. 1 c)
· Compression forming (Fig. 1 d)
· Radial draw forming (Fig. 1 e)
   

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