With the development of wooden architecture, the demand for knives became higher and higher, and in Miki, in the 2nd year of Kanpo (1742).
Wild tool smith manufactures cutlery,
Forge welding of steel and iron-Shaping (2chou-dori method) -Mud coating-Quenching-With blade, etc. 21 process technology is only a small item,
Special technology is required, and its sharpness is truly a wonderful knife.
1Steel making
Cut the steel to the size of the blade.
2Making iron
Process iron (soft iron, kettle) to the required size.
3Forge welding
Work to join iron and steel. Apply a bonding agent to iron, heat it to a high temperature (1000 to 1100℃), and hit it with a mallet to bond it.
4Forging
Heat the forge-welded material to heat (800-900℃) and forge it with a mallet to form a shape.
5Shaping(fire making)
Make a shape with a mallet on the anvil.
6Annealing
The structure of steel disordered by forge welding and forging is placed in a furnace heated to 750℃ and slowly cooled to spheroidize the structure.
7Back out
Shape it with a grinder or the like.
8Back sharpening
Shape it with a grinder.
9Imprint
Engrave a trademark, etc.
10Leveling smoothing
Make the back while hitting with a mallet.
11Strain removal
Work to remove the distortion caused by the smoothing.
12Rough finish
Shape it with a grinder.
13Mud coating
Apply mud (abrasive powder) so that the quenching is evenly performed.
14Quenching
Work to harden steel by heating it to 780 to 800℃, soaking it in water and quenching it.
15Tempering
Heat to 180℃ to make the steel sticky.
16Distortion
Correct the distortion caused by quenching.
17Back sharpening (baking back sharpening)
Work to polish with the buff on the back side.
18Blade
Attach a blade using a rough whetstone, a medium whetstone, and a finishing whetstone.
19Finish distortion removal
Remove the distortion caused by finishing.
20Sheath attachment
Finally, attach the sheath.
Complete
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