Bright Sword Military System

Chapter 1470 Smoothbore Cannon

After discussing in detail with Qin Jian and the others, Wang Xuexin realized that there are several types of cannon barrels made at this time, including wire tight tubes, barrel tight tubes and self-tightening tubes.

In fact, Wang Xuexin knows some knowledge in this area. Modern Huaxia tank guns use the "single-wall self-tightening" technology. "Single-wall self-tightening" should be what is called "self-tightening barrel" in this era.

But the names are different, and Wang Xuexin doesn't know its development process and classification, so he didn't connect them for a while.

According to Qin Jian's explanation, the gun barrel is prone to cracks and then explodes during use.

This is not because of the chamber pressure... Although the chamber pressure is one of the factors that cause the chamber to explode, the barrel needs to be "screw tight", "barrel tight" and "self-tight" because of thermal expansion and contraction.

The barrel usually has a certain thickness, and the larger the caliber, the thicker it is, so that it can withstand the chamber pressure brought by the gun.

But if you just blindly pile up steel to increase the thickness of the gun barrel, it will not work, and it may even be counterproductive.

The reason is that when the artillery fires, the inner ring of the barrel will expand rapidly due to the friction of the shell and the explosion of gunpowder due to the friction of the shell and the explosion of the gunpowder. At this time, the temperature has not even reached the outer ring.

What's more terrible is that if you want to keep the outer ring and the inner ring expanding synchronously, the outer ring should be heated more and the inner ring should be heated less... because the circumference of the outer ring will be much larger than the inner ring at the same angular velocity.

As soon as this remark came out, the participants really "looked at each other differently". They all looked at Wang Xuexin with doubts and puzzled eyes. , even Su Xin was puzzled by this.

Others agreed:

"Smoothbore guns are inaccurate on the battlefield, that's no good!"

impossible!
He imported the tanks of Maoxiong and Yingjiang, and he trained the tank soldiers by himself. How could he not know that the tank guns are rifled guns!
How come...

……

The opposite is true for the gun barrel, where the inner ring receives a lot of heat but the outer ring receives almost no heat.

The self-tightening tube is to pressurize directly inside the barrel so that the density of the inner wall is different from that of the outer wall so as to achieve the purpose of self-tightening of the inner ring.

Wang Xuexin can understand this, Hans used submarine warfare to blockade the sun never sets, and supplies are scarce, and the devils have no choice but to save resources, so they still keep the "silk tight tube" technology to make do with it.

The meeting room fell silent for a moment.

"I know!" Wang Xuexin replied in a normal voice: "But the rifled gun is expensive, isn't it? And the production is time-consuming and its lifespan is shorter than that of the smoothbore gun!"

The "self-tight tube" of these three processes is the most difficult, and it is not realistic to realize it at the current industrial level of the Eighth Route Army. Although the "silk tight tube" has been realized, it has fallen behind...

The principle is simple: won't the inner ring of the gun barrel expand when heated?Then squeeze the inner ring to a certain extent first, so that part of the effect of expansion can be offset!
Wire-tight gun barrel is to wind and squeeze the gun barrel with steel wire or steel belt in circles.

"We must be ready to learn!" Wang Xuexin said: "After learning the 'barrel and tight tube' technology, we will immediately produce our own artillery!"

Wang Xuexin nodded and said: "Comrades, you all know that smoothbore guns and rifled guns have their own advantages and disadvantages. The biggest disadvantage of smoothbore guns is that they cannot hit far and accurate. But if the smoothbore guns we produce are cheap and long-lasting, Can you still shoot far and accurately?"

Qin Jian knew a lot about this aspect. He introduced: "The silk tight tube technology was invented by the never-setting sun, and their battleship main guns are still using this technology. I heard that the main guns on the Devil battleship are also partially used This kind of technology is no longer suitable for the needs of the current battlefield!"

"That's right! We can overcome the problems of high cost and time-consuming, and war is no joke!"

"100MM caliber!" Wang Xuexin replied without thinking: "The length of the barrel... is tentatively set at 5500 mm, and it will be revised depending on the situation!"

The barrel tight tube is like the old sleeve, which uses one barrel to fit another barrel. The difference is that the inner diameter of the outer ring barrel should be slightly smaller than the inner ring barrel... This is generally impossible to put on, but if you give the outer barrel The ring barrel is heated to make it expand, and it can be "barely" put on. After the outer ring barrel cools down, the inner ring can be squeezed.

"Rifling data..."

However, because it is wound up with steel wire in circles, it is not reinforced in the longitudinal direction, and the barrel is easily bent due to its own weight.

"No rifling!" Wang Xuexin interrupted Qin Jian: "Smoothbore!"

Thinking about it, Professor Su asked: "Commander, do you have other considerations in choosing the smoothbore gun?"

Therefore, the expansion force of the inner ring of each shell will tear the outer ring, and cracks will appear in the barrel after a long time, and the cracks will continue to expand during use and finally burst suddenly... This is the explosion chamber.

Yingjiang, a local tyrant, is different. The main guns used on battleships not only use "barrel tight tubes", but also one gun is put on ten layers, that is, the gun barrels are put on top of each other before they are formed. Not only In this way, a few good ones were selected from more than a hundred gun barrels to use...

"Yes, if it's not accurate, what's the point of producing tanks? Isn't it a waste of money?"

It was only then that Qin Jian was convinced that he had heard correctly, and he objected: "Regimental Commander, our arsenal has rifling machine tools that can do it! Besides, no matter how hard or tiring we are, we can't risk the lives of our soldiers!"

Professor Su felt a little strange in his heart, the head of the group is not such a person with no common sense!
Does he not understand tanks?

In order to avoid the explosion caused by the dislocation of the inner and outer rings due to thermal expansion, people invented the "shrink barrel" technology.

How embarrassing is this for other countries that are still using "silk tight tubes"!

"Regimental Commander!" Su Xin worried that Wang Xuexin would make a fool of himself, and reminded him in a low voice, "Tank guns are all rifled guns!"

Wang Xuexin was talking about the 69mm smoothbore gun used by the Huaxia Type 100 tank. He dared not directly say that this gun is 5450mm long.

Obviously, the tube tight tube can achieve longitudinal reinforcement at the same time, which is more stable than the silk tight tube, but it is more difficult to achieve.

Qin Jian responded, and then asked: "Commander, what is the specification of the artillery..."

After a while, Qin Jian asked suspiciously: "Commander, this is impossible! Is there such a good thing in the world that takes all the benefits?"

Luo Guangjian also raised a question: "Commander, if this is true, why do other countries, including Sunbushi, Yingjiang, and Maoxiong, all use rifled guns?"

"They didn't find out where the problem is!" Wang Xuexin replied easily.

Hearing this, Su Xin understood, what new invention did this classmate Xiao Wang have.

(End of this chapter)