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fine blanking

With Fine Blanking, the end result is a more accurately shaped product without fractured and bent surfaces.

In that general stamping, when punching down to the work, it bends and shears; the shear-fractured fragment is pushed down before punching through the die hole.

In addition to small sheared surface fraction, the sheared edges are also dull and original flat surface is forced to be bent. Then, most of products needs the secondary processing like machining.

In FB-forming, shearing takes place under high traction state by three-axis motions.

In the first motion where the lower die moves up, the work is fixed by work-holder and die through the V-letter shaped ring between two.

In the following motion, shearing takes place by main traction with inverse traction by using the counter punch.

Furthermore, the clearance (d) between punch and die is also much different between two forming processes. In the former, d = 7 – 10 % while d becomes nearly zero by FB-forming.

The above narrowed clearance results in fine and accurately shaped product without any fractured and bent surfaces.