The smelting of swords evolved from the initial bronze sword to the iron sword to the sandwich sword, and then to the pure steel sword. The forging process of the sandwich sword is roughly as follows:
1. Hammering: The iron block is boiled in the furnace, and the sword blank is made by carburizing process, repeated many times, and the degree depends on the quality of the sword (hard sword, soft sword or martial arts sword).
Second, planing file: use a steel knife to cut the file, so that the thickness of the sword body is moderate, the sword ridge and the blade between the certain slope, the sword ridge must be in the middle of the sword body, and a straight line.
Third, quenching: the use of traditional quenching method, "strong forging", the use of special quenching agent for "softening" treatment, so that the sword body is rigid and soft, can flex and stretch. It is a high-precision craft, which is not handy for ordinary craftsmen.
4. Polishing: Place the filed sword on the cuo stone and polish it. Wrap an iron ruler in a gold steel sand cloth and rub evenly. First grind with a coarse sand cloth, and then finely grind with a fine sand cloth. The polishing is twice as good as hammering and planing.
5. Steel grinding: sharpen the elastic sword with steel blocks, or use a steel ruler to tie the sword body tightly and place it on cuo stone to grind. There is a mountain in Longquan North Township, a special product of Cuoshi, commonly known as "Bright Stone". After the sword is ground by "glitter", it does not need to be nickel-plated, and the sword body shines blue.
Sixth, inlay: after polishing, the sword body is engraved with a steel needle, the sword name, the shop number and the customizer's inscription, embedded with red copper, after chemical treatment, so that the blue light sword appears golden, resulting in color contrast, with a sense of aura. Craftsmen engrave patterns, do not need to depict, only rely on a steel needle on both sides of the sword body that is only inches wide, engraved yellow dragon and golden phoenix, lifelike, galloping, dragon and phoenix are auspicious, happiness lingering; the seven stars are like the Big Dipper, dazzling, very artistic.
The quality of the sword, in addition to the exercise technology, also has a lot to do with the quenched water quality, quenching agent, climate, etc.
One: forging
Some special performance requirements, the need for composite clamping steel also needs the following steps:
Two: planing file shaping
Three: quenching
Four: Polishing
Five: steel mill
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