Stretching stretch forming stretch forming is a sheet metal forming process in which the sheet metal is intentionally stretched and simultaneously bent to have the shape change.
Stretch forming operation in sheet metal.
The stretch forming consists of gripper mechanism which is supported by hydraulic unit of holding the sheet metal.
It is a type of bending operation in which a piece of sheet metal is fixed or held between two dies from one end as shown in the fig.
Stretch forming is a metal forming process in which a piece of sheet metal is stretched and bent simultaneously over a die in order to form large contoured parts.
The metal being formed must have the ability to stretch and compress within given limits.
The die depends on the final require shape of product.
Drawn shapes that involve metal flow particularly straight cylindrical shells and details that result from such compression operations as coining and embossing cannot be made.
Hydro forming cheap tooling no net thinning slow high formability material stretched into shape stretch forming very cheap tooling net thinning slow low formability super plastic forming cheap tooling net thinning expensive sheet metal slow very high formability technology a brief review forming speed 20.
Almost any shape that can be produced by other sheet forming methods can be produced by stretch forming.
Stretch forming aluminum extrusion duration.
The system having set of gripper is used to stretch the sheet metal.
Then the other end is forced to strike upon the punch which is free or unfixed.
Stretch forming is a metal forming process in which a piece of sheet metal is stretched and bent simultaneously over a die in order to form large contoured parts.
Stretch forming is performed on a stretch press in which a piece of sheet metal is securely gripped along its edges by gripping jaws.
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Stretch forming is performed on a stretch press in which a piece of sheet metal is securely gripped along its edges by gripping jaws.
When the die is support on the rotating table as shown in figure.
Sheet is held by jaws or drawbeads at both the ends and then stretched by punch such that the sheet is stressed above yield strength.
Thus the free or unfixed edge of the sheet metal piece is bent to make the forming process.
Most part defects such as splits and wrinkles occur in forming operations.
Successful sheet metal forming relies heavily on the metal s mechanical properties.
The key is to try to form the sheet metal with as little stretching as possible although a slight amount of stretching will occur because tension is involved in the drawing process.
