This is another "Dave" but I can describe "Stock removal".
It is where you take a bar of steel and grind away steel to get the shape/form you want. This contrasts from forgeing where you heat the steel and pound the steel into the shape you want. To achieve a Flat and smooth surface, like in the picture, you have to be extremely good at forgeing and very skilled with a hammer. With stock removal it is much more simple, you grind it flat with a series of stones/sandpaper that are increasing in grit. (Gradually more fine of a cutting) until you get around 1500 to 2000 grit, then you stick the thing on a buffer.
Both techniques take skill, I have never tryed forging but I consider the more difficult of the two.
The amaizing thing is that the kamis do not have the material or equiptment for stock removal. To maxamize their output and minimize waste it makes more sense to forge.
(I think I have my assumptions correct, but if anyone sees any flaws in my logic please correct me.)