Sheet Metal Processes Processing Techology

Shearing machine which has a long blade to make straight line cuts; it used to cut long sheets of metal into smaller sheet.

A sheet metal punching machine-the cutting tool is a punch, a piece of hard tool steel which is punched down on the sheet to cut a hole.
Other methods of cutting sheets
flame cutting; sawing, laser cutting, and water –jet machining.


A large percentage of sheet metal parts are bent along some lines to get them into the desired shape for use.
Example shows a simple bend on a rectangular blank.


Some issues in bending
Minimum bending radius and cracking
When the bending radius is too small, the strain level on the outer layers is too high, and usually the top layer will undergo plastic deformation or cracking.
Anisotropic properties
Since most sheet used as blanks are formed by rolling, they have anisotropic properties. Thus, the orientation in which you cut the blank from the raw sheet may depend on the bending operation you will perform.


Recall from your stress-strain curves that when the stress is released, the all materials experience some elastic recovery.


Deep Drawing
A type of drawing process where the depth of the part is more than half its diameter.


Roll Forming
A continuous bending operation in which a long strip of metal (typically coiled steel) is passed through consecutive sets of rolls, or stands, each performing only an incremental part of the bend, until the desired cross-section profile is obtained.


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