Daqin Engineers

The ancient ship cannon is technically than the gun.

The reason is that the artillery can use thick copper, iron stacks make it less likely to be fried, and the fire requires a single soldier, so it requires light weight, which determines the barrel can't be too thick, so the blow is a common thing.

So that when gun guns, they have to be cast into the whole iron rod and then drill slowly with steel drills. It is often a worker to grow a qualified barrel.

The artillery is not so troublesome.

The most primitive artillery is directly made of artillery embryos, then cast copper water into it, and then remove the metal tube, and then use the copper hoop or the hoop in the barrel and pharmacy.

Of course, the artillery that Shen Bing should not be so original ...

This original artillery also exists the problem.

Shen Bing is to let the blacksmith cast the artillery into two layers, and the inner layer is iron cast, which is used.

At present, there is no new iron in Shazhou, but this problem is not big, and Shen Bing will directly draw a few Metallic Workshop to Qin Jun, including the workshop craftsman.

Then, the blast furnace is then pushed into the water mill.

As for coal, it is not necessary.

In fact, coal refinement does not improve the quality of iron, but can reduce costs in batches.

At this time, the ironing of the soldiers is not much iron, and it can be solved with carbon.

Responsible for these smelting workshops is a Qin people called Ming.

In fact, I don't know if he is not a Qin.

He is the same as the profit, and he is captured by the month of the month, so he is very different from the little moon, living habits, etc.

Because in the middle of the original words, the Moon's king will let him manage the blacksmiths from the Central Plains.

Ming was a near future with Shen Bing.

"I don't know what the general is?"

"The parents are the Xianyang people, because they have been robbed to the month of the business."

"The next heart is not able to escape from the Qin State, and today the generals come to pay for it!"

Shen Bing is not available.

Because he knows that if this Ming can mix it in the position of the moon, it is deeply trusted by the moon.

If the trust of moon is inevitably loyal in various forms, he said that he said that he yearn for Daqin ... it is not trustworthy.

But Shen Bing doesn't matter.

Because Shen Bing has already gone Wang Hao, all the blacksmiths that were included in the Qin military, and his family also moved to the tight tube of Qin Jun.

For this, Shen Bing can't dare to hurt, because it is just a big event, and then add artillery technology?

Since the Ming has been seen, then the soldiers don't matter if he said, "one yearning to the big Qin" is true.

Shen Bing handed the sketch of the artillery to Ming, said:

"Is it difficult to cast this copper gun?"

At first glance, I have a reply to my chest:

"It's not difficult, it's not difficult! It is now making it right away!"

It is indeed difficult, it said that the bottom is the root copper tube.

It is exactly the outer iron tube in the outer iron tube, but it is necessary to leave a fire door in the pharmacy for use.

Shen Bing asked:

"How long does it take?"

Ming calculated, just replied:

"If you want to cast a new iron, you can only be made after a month!"

Shen Bing nodded:

"System for 20 doors, and then put the projectile in the new iron!"

The name should be retired.

This iron core copper cannon is something that is in the Qing Dynasty.

It is only, but the clear army is used to drill the gun with the whole iron column like a gun.

This cream is also higher, and the disadvantages are extremely long.

When Shen Bing did not need this precision and life, it quickly formed with casting methods.

The disadvantage of casting is that the iron core copper coat can reduce the risk of the explosive of the explosive ... A combination of the two, get a artillery that can quickly produce performance.

The reason why the core copper coat can reduce the risk of exploding is related to the thermal expansion.

If the gun body is made of copper or iron, there is such a problem: the barrel is uniform, and the heat is always spread out of the internal heat.

If the gun is divided into inner wall and outer wall, the heat of the inner wall is always more than the outer wall.

The inner wall is then largely formed in a greater formation of tension, and the outer wall is supported.

If you want to analyze carefully, this also has different problems with the inner and outer walls of the same angle:

The inner wall is close to the center, as long as the length of a small amount of heat is small, the outer wall needs to expand a few times the length of the expansion to adapt to it.

The result is that the outer wall will produce a crack that can't see after the ecstasy, if the crack is not much, but the number is increasing and finally ... then launching the shells " "The snatch.

This is not a simple pile of copper piles to solve, even more copper iron make the gun tube, the more serious the internal and external walls.

Modern solutions to this problem are techniques using "single-walled self-tightening".

Simply put, the inner wall is produced in a state in which the outer wall is higher than the largest density, and its heat expansion is just in the expansion of the outer wall, so it is not easy to blow.

This technology is simple, but in modern but a few countries that can be mastered globally, Japan is not imported from Germany because there is no such technology.

Even so, Japan can also be self-producing a tank, saying that it is "Asia's first" ...

The reason why the iron core copper cannon is not easy to fish:

First, because the characteristics of the iron itself are toughness and tension, unlike bronze.

More importantly, iron and copper expansion systems are different.

The thermal expansion system of the iron is 12.2, while the coefficient of thermal expansion of copper is 17.5.

So the special structure of such internal iron outer copper, the gun is thermally expanded, but it cannot achieve "single-walled self-tightening", but it can reduce the risk of the bombing.

This will give it to Wang Bao Mission.

Wang Hao is a Fa family, and it is very rigorous, and it is very rigorous.

It is just Wang Wei who has quite a micro-word for the monitoring artillery:

"General, I am waiting for how to enter the Western region, what is the use of this iron pipe?"

"Don't it help me wait for the Huxian?"

Shen Bing laughed and replied:

"But the school guess, this iron tube is used to break the hoe!"

Wang Yu is writing not believed:

"This iron pipe ... can I break the Xiongnu?"

"The general army should laugh!"

Shen Bing just smiled and did not explain.

Many things want to explain and unclear.

For example, with Wang Hao, this iron pipe can make the solid iron bomb hundreds of boom ... that is more than he can imagine.