"Boss, I think this cannon should be made of bronze." Daniu studied the drawings for a long time and suddenly said.

"You see, although this iron is hard, it is not very useful for hardness. Instead, it is softer and easier to plug into shells."

"You see, this copper is different. It has a low melting point, good ductility, and is easy to cast and adapt."

"We can completely replace the gun barrel with bronze, and these seven iron hoops are fixed with fine iron."

"The hardness of the barrel of fine iron can allow us to make the barrel longer, shoot farther and have higher accuracy. However, too thin barrels may make the measurement of gunpowder smaller, which will affect the design."

"Although the bronze is soft and the barrel is short, the barrel is thicker. Although it is slightly closer, the loading capacity is more sufficient."

"I personally prefer short, thick and soft cannon barrels, which are thin and hard, and they are really useless." Daniu held the drawings and expressed his opinions endlessly.

Although what you said makes sense, I still feel like you are driving. In order to prevent the big bull from driving the car directly until it overturned, Li Chen quickly interrupted him and said, "I will leave this matter to you. I only have one request, that is, this cannon can be fired."

"Boss, don't worry, since I'll help you with a cannon, I will definitely use eighteen points of strength." Daniu said seriously.

"Is it to build cannons? Are you renting your tongue? It's not easy to use." Li Chen cursed.

Although Daniu had never read a book, he was definitely a genius in his craftsmanship. After a few days, Daniu did not rush to make a cannon. Instead, he made technical improvements based on the casting method recorded on the drawings. It is hard to imagine that a rude person as Daniu could calm down and write and draw.

The main structure of this cannon is the barrel. The barrels of ancient artillery were usually made by casting.

"Bang, bang, bang."

A thunderous sound came from the craftsman's house. Under the leadership of Daniu, the skilled craftsmen of the DAMO Academy began to work together to cast the first artillery of the Qin Dynasty, which would become the backbone of the old Qin people. In a few years, all the artillery fire will be filled with the truth of the Qin Dynasty.

Some craftsmen first use very dry nanmu to make gun molds according to the style of the cannon body. The two ends of the cannon mold should grow more than one foot to make a shaft head, and an iron rotating stick is added to the shaft head, and then the cannon mold is placed on the rotating frame to rotate and put mud on.

After the gun mold is made, the mold with the words "电影", the gun ears, the gun hoop and the flower head are installed, and the gun mold is evenly applied with fine coal ash. After drying, use the fine yellow mud and the sieved fine sand, mix them into the mud, mix them with the wool, mix them into the mud, and then make a "marine".

After the mud is prepared, apply it on the gun mold, then turn the rotating stick, swing the board with a round-mouth wooden plate, dip it in water and wait until it is dry. After it is dried, add mud according to the previous method. After the mud is put to a certain thickness, use thick iron wire to wrap it from the head of the gun mold to the tail, and then apply mud according to the previous method. After the thickness is almost reached, use iron bars with a large finger, use more long ones and less short ones, and evenly place them on the gun mold as a skeleton. Then use an iron hoop of 1 inch wide and 5 minutes thick to fuse it from the head of the gun mold to the tail of the gun mold, and evenly hang it outside the iron bars.

Then put the mud on and then squish it evenly. After it is completely dry, take out the wood core and put the charcoal fire into the mud mold. On the one hand, it is to burn the mud mold, and on the other hand, it is to burn the gun ears, gun hoops and flower heads into ashes.

After cooling, sweep out the ash, place the bottom of the wood mold, and then install the tail beads. Then add mud. After drying, take out the bottom of the wooden cannon mold, then burn the tail beads with charcoal fire, and wait for the kiln to cast.

At the same time, the other craftsmen made moldings with iron, which was equal to the length of the inner diameter of the cannon, and the size was half the inner diameter of the cannon. They were also very mud-filled and easy to use after drying.

After casting the gun mold and the cannon core, it is necessary to install the gun mold and the cannon core together. The cannon mold is light for several thousand kilograms, and the cannon core is also very bulky. It depends on the help of simple machinery. First lay the cannon mold, then install the mold core in the cannon mold, tighten the lower mouth, and pad it with dry soil around it.

After the gun mold and gun core are installed, the bronze must be melted and then cast into thin slices of three or five kilograms per piece, waiting to be poured into a large furnace for casting.

Put the refined copper into a pre-bricked copper-shaped copper pouring furnace, then use high heat to catalyze the copper into juice, and then gradually add copper.

When all the copper juice is clear, like oil and water, and golden flames appear on it, the copper juice is drawn out and gradually put into the mold. When the wooden mold is filled, the casting is completed.

After the cannon is cast, loosen the mold heart; on the 5th day, remove the mold heart; on the 8th day, dig the soil, put down the cannon, raise the two ends to about 2 feet high, knock off the mud on the mold, sweep it clean, and the cannon body will be cast.

Because the newly built muzzle is uneven, it must be uniform and smooth. Pull the knife into the muzzle and turn the inner chamber of the cannon into extremely smooth.

The muzzle and barrel must be polished smoothly. Only smooth and round cannons are good cannons.

After the barrel and muzzle are processed, the fire door must be drilled. Whether the position of the cannon is appropriate depends on the use of the cannon. Therefore, it is necessary to compare the size of the inner chamber, close to the bottom of the cannon, use a solid steel drill and dip oil to drill the fire door. The fire door must be parallel to the bottom of the cannon to be considered appropriate.

"Brother, Brother Daniu has been sleeping for more than ten days." Liu Zi said to Li Chen outside the craftsman's house.

During these ten days, although the rest of the craftsmen were tired, they were also taking turns to rest. Only Daniu had never come out for a day after entering the craftsman's house. Other craftsmen brought in to eat. It is said that when they were tired, they would just find a place to hang out for a while.

"Don't die suddenly, Daniu," Li Chen said with some concern. Daniu, the man who was named, was really digging. Li Chen had asked him to rest several times, but Daniu just didn't want to, and it was useless for anyone to persuade him.

"Boom." Just as the two were chatting outside, there was a roar in the room.

"Bang."

"Swoosh, swosh, swosh."

I saw a colored projectile flying out of the window, and the house shook three times. Fortunately, Lijiazhuang has now lived in a brick house. If it were a wooden house, it would be possible that the house would collapse if it were the wooden house.

"Boss, look, you live up to expectations." Daniu patted the bronze-cast cannon body and said proudly.

"You boy, you are such a genius." Li Chen said happily, looking at the two cannons, one big and one small, on the ground.

This small cannon is a tiger squat cannon made according to the pictures provided by Li Chen, and this cannon is actually similar to the red-clothed cannon from the Ming Dynasty.

Li Daniu is indeed a genius. Li Chen only gave him the drawings of tiger squatting cannons, flowering bullets and solid bullets. He actually learned from them and created this cannon with stronger firepower and longer range without the drawings.

"Boss, look, this is a cannon, this is a small cannon, and what you said is a flowering bullet, a solid bullet." The big bull said with a serene intention.

"Niu Pi." Li Chen looked at this rough man and was stunned for a long time. As expected, I was born to be useful, and everyone has their own field of expertise.

Behind the two, Liuzi looked a little down and out, as if he was the only one of the threesomes in Lijiazhuang.
Chapter completed!