Fine blanking process was first introduced & patented by Germany in 1923. This technology was initially used for office machine industry &clock industry.
It is refined technique of conventional stamping .A hybrid metal forming process combining the technology of stamping & cold extrusion . Triple action presses combined with special designed tooling produce parts impossible to make with any other stamping process.
Fine blanking is extremely precise high volume manufacturing process which gives almost 100% sheared edge & flat parts with cost effectiveness & repeatability .It can replace several secondary operations.
In the last century several parts have been considered for manufacturing under this technology such as engine parts , door latches , window regulators , gear box part ,compressor parts ,exhaust flanges etc.
Several advancements in the fine blanking technology has been done through CNC tool room machines, CNC presses & raw material developments thus
Working Principle
Process Sequence
The Complete Fineblanking Cycle :
Conventional Stamping
Fineblanking
Production Method
Single-action machine
material strip not firmly
clamped during the
blanking operation
Features
Sheared surface 1/3 s
sheared surface 2/3 s
Flatness Deflection of part
during the blanking
operation
Tapered die-plate.
Difference in dimensions
after to re-grinding
Conventionally stamped surface
Structure
Production Method
Triple-action machine
FS = Shear Force
FR = Vee-ring indenter
Force
FG = Counter Force
Material Strip is firmly
Clamped during the
blanking operation by V-
ring indenter and Counter
Force
Features
Sheared Surface max
90% clean cut
Close dimensional
tolerances
Maximum angular
accuracy
Minimum die-roll opposite
the burr side
Improved flatness
Cylindrical die-plate, thus
no difference in
dimensions caused by re-
grinding.