New Sword 2
Some pictures on the work of Kobuse style blade
Hard and dense steel pieces of NBTHK tamahagane are selected, and folded 7 times.
The dark spot at the center of the steel suggests there is a blister in it.
A little milder steel pieces are selected and folded 8 times. Then the previous steel block is put on it.
Then the two steel blocks are welded and folded. It is so called "mix forging".
The neck of the handle broke off by accident. So the work ended up with 4 times folding. This is the steel for edge.
The core steel is on the way of fold'n welding.
The core steel is fold'n welded 12 times.
The core steel and the outer steel are prepared.
The steels are constructed to one steel bar with Kobuse style.
The steel bar is drawn out to the blade length.
It is shaped with hammer work.
It is shaped with plane and files.
Just after the quenching work
Shaping work with Binsui stone
Blade length 78.3cm, curvature 1.9cm, Thickness at the base 8mm, width 3.4cm
Steel has a wood grain layer pattern, and rough large layer pattern appears hear and there. The steel particles are a little larger than usual. Activities of steel particles in shinogi-ji also is interesting, since it has no mirror finish. The influence of mix forging doesn't appear except for around the starting of hamon.
Hamon is made of small particles and large particles, making ko-midare and small choji patterns.
This is a simple sword without any tricky appearances. It is an interpretation of what Ko-Bizen is by our smith. The outer steel is folded 11 times in total. It is less than his usual work. Because of the less folding or other reasons, the steel texture looks course than his usual work. The large and rough layer also brings a taste of Koto blade. Anyway, we are not sure, if his challenge to Ko-Bizen is good or fail.
This blade is just a fresh polishing, so it will need some more months treatment with uchiko powder to clean up the blade surface.
Shirasaya and bag
Paper of "Nyusen" (normal award) in the NBTHK competition 2017.