Chapter 93

Stone bear likes to see Ferguson this proud little fresh meat, showing such a tangled.

Compared with making this guy miserable, Shi Xiong doesn't care much about whether he calls himself "brother" or "boss".

It means that he's really moved. Otherwise, this guy will definitely behave like he did in xiaoyanshan just now. He won't say a word and will turn away.

People are so rude to refuse things they are not interested in.

Little salt hill is not far from the tribe, and lieutenant Ferguson returns to the tribe in a tangled way. But this guy didn't seem to make up his mind to call "boss", so he just followed the stone bear in silence.

Stone bear really wants to poke this guy's mind. This guy will be able to develop a Ferguson rifle that is at least 30 years ahead of this era in the next 10 years, which is enough to show his talent in firearms.

In fact, Lieutenant Ferguson, who had served in Flanders and Germany, had seen rifles from many countries. It was for this reason that he was able to combine the advantages of rifles from various countries and finally created the Ferguson rifle.

Although that rifle was not popularized in the end for some reasons, it is undeniable that this rifle created by this guy is definitely a gun worth remembering forever in the history of human firearms, because it is the first time in the history of human firearms to use the afterloading method.

Back to the tribe, the horse, the hard bone and the rabbit's mouth are all surrounded. The stone bear asks the rabbit's mouth to call the wood plane. Today, he is going to try to cast the first barrel in his life.

To be honest, Shi Xiong has never touched a gun in his previous life or this life. Even though he was very interested in guns in his previous life, as a law-abiding honest man, he can only drool at the high-definition gun wallpaper on the computer screen every day.

Stone bear would never touch a gun before he met Ferguson. Compared with steel-making and salt making, casting gun barrel is only a dream for stone bear.

Gun barrel is not an ordinary thing. No matter in any era, the steel and technology used in gun barrel are the most cutting-edge things. Although there are so many kinds of firearms in the future, few countries can master the barrel manufacturing technology.

It's not like steelmaking or salt making. If the steelmaking is not good, the big problem is to turn a furnace of hot metal into pig iron, just like the last time Shixiong steelmaking. If you can't make salt well, you can't eat it.

But the barrel is different. Once this thing is made, it has to be installed on the gun. If the quality of the barrel is not up to the standard, once the gun is filled with powder and the projectile is fired, the explosion will take human life.

So before the arrival of lieutenant Ferguson, even if stone bear really wanted to try to make his own gun, he never put it into action.

Now that lieutenant Ferguson is here, with this guy who knows a lot about guns, stone bear dare to make his own guns. It's not necessary to try the barrel with human life. With his eyes and hands, Lieutenant Ferguson can definitely judge the quality of the barrel. This guy has the ability!

Although the gun barrels of later generations are made of all kinds of special alloy steel, in this era, when the steel can only be refined by graphite crucible, the gun barrels used by the armies of all countries are still made of wrought iron or even pig iron.

Yes, in this era, rifle barrels in many European countries are made by casting. In the past, a blacksmith used to heat the gun barrel with wrought iron, forge it with a hammer and roll it up at the same time to form the gun barrel. However, the efficiency of this method was too low, so the casting method gradually replaced this manual method.

Although it is absolutely impractical to cast gun barrel in later generations, in this era when guns are all pre loaded, because the interval between each two guns is very long, and most of them are sub caliber bullets. In addition, the propellants in this era are black powder, and the explosion power is far lower than smokeless powder. Therefore, there are not many gun barrels in this era even if they explode.

Cast barrel is enough.

If smokeless powder appears in this era, and then you use this kind of gun barrel made of wrought iron or pig iron, then ten guns will definitely explode ten times!

Shi Xiong plans to use medium carbon steel for his first casting barrel.

Thanks to the first batch of medium carbon steel stir fried with kaolin clay crucible, now the stone bear and wood planer are very confident in refining a pot of medium carbon steel.

Although medium carbon steel is not the best material for casting gun barrel, it is many times stronger than wrought iron or even pig iron!

For example, the special steel used for gun barrel manufacturing in later generations, even the most common 40Cr steel, can't be straightened out in any case.

Not to mention the quenching process, the stone bear knows nothing about it. Although he knows water quenching, oil quenching, low temperature tempering, medium temperature tempering and high temperature tempering, he really doesn't know how to do it.

There are also technologies such as drilling and precision cold forging used in the manufacture of gun barrels, which are not available to stone bears now.

So, it's better to make the first barrel in your life by casting honestly.

"What is this? Can steel be made from this? "

"Oh, MAIGA, isn't this earthen pot bad?"

"Jesus Christ, am I right? Why don't you use sand to make molds? Can this clay withstand the high temperature of molten iron? "

......

Having been standing by and watching the stone bear, Lieutenant Ferguson, who is busy, can't help it any more. He begins to turn into a curious baby. His mouth turns into a Gatling machine gun. One by one, questions keep popping out of his mouth.

At first, Shi Xiong explained, but later he was too lazy to explain. If you explain everything to this guy, you won't have to do anything today.

Before making a fire, you need to make a mold. In order to make the inside and outside of the barrel more smooth and minimize the existence of sand holes, stone bear and wood planer carefully prepared the kaolin clay mold.

The melting point of kaolin is close to 1800 degrees, and the temperature of molten steel can not destroy the kaolin mold. And kaolin is much more delicate than sand, so the roughness of gun barrel produced by this way is far lower than that produced by sand mold casting.

It's difficult to make this mold. Several people work together, and they work until noon. In order to prevent the bore from exploding, when making the mold, Shi Xiong specially thickened the part of the powder chamber, so that after the barrel is cast, the part of the powder chamber will be thicker than other parts.

After all, the blast chamber is almost always in the powder chamber, which is the place where the whole gun is most stressed.

After the mold is made, the next step is to make steel