PRINCIPLE OF METAL CUTTING:
The cutting of sheet metal in press work is a shearing
process.The punch and die have same shape of the part.
The sheet metal is held between punch and die.The punch
moves down and presses the metal into the opening of the
die.
There is a gap between the punch and die opening.This is
called as “Clearance”. The amount of clearance depends
upon the type and thickness of the material.
The punch touches the metal and travels downward.
The material is subjected to both tensile and compressive
stresses. By this pressure, the metal is deformed plastically.
The plastic deformation takes place in small area between
punch and die cutting edges. So the metal in this area is
highly stressed. When the stress exceeds the ultimate
strength of the material,fracture takes place.
The cutting edge of the punch starts the fracture,
in the metal from the bottom.The cutting edge of the die
starts the fracture from the top. These fractures meet at
center of the plate.
As the punch continuous tomove down, the metal
under the die is completely cutoff from the sheet metal.
The cut out portion of the metal drops down through
the die opening.To make the metal to drop down freely,
a die relief is given in the die block.
If the clearance is too large or too small cracks
do not meet and a ragged edge results due to the
material being dragged and torn through the die.
The cutting of sheet metal in press work is a shearing
process.The punch and die have same shape of the part.
The sheet metal is held between punch and die.The punch
moves down and presses the metal into the opening of the
die.
There is a gap between the punch and die opening.This is
called as “Clearance”. The amount of clearance depends
upon the type and thickness of the material.
The punch touches the metal and travels downward.
The material is subjected to both tensile and compressive
stresses. By this pressure, the metal is deformed plastically.
The plastic deformation takes place in small area between
punch and die cutting edges. So the metal in this area is
highly stressed. When the stress exceeds the ultimate
strength of the material,fracture takes place.
The cutting edge of the punch starts the fracture,
in the metal from the bottom.The cutting edge of the die
starts the fracture from the top. These fractures meet at
center of the plate.
As the punch continuous tomove down, the metal
under the die is completely cutoff from the sheet metal.
The cut out portion of the metal drops down through
the die opening.To make the metal to drop down freely,
a die relief is given in the die block.
If the clearance is too large or too small cracks
do not meet and a ragged edge results due to the
material being dragged and torn through the die.
6 comments:
This is very helpful for our tool and die making course.
Organized content is the best way to display or post an article, thank you for making it easy to digest your post.
Sheet metal cutters
Nice post. The basic principles of metal cutting are important to be kept in mind while dealing with cutting process. Will recommend your post to our subscribers at http://www.bipico.com/.
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What is the actual working principle ?
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