Thermal expansion and contraction are one of the basic laws of nature. Under the sunlight, the temperature of the outer surface of the cannon body tube is uneven, which will cause the cannon tube to bend.
This curve sounds mysterious, just like cooking at home will pollute the atmosphere.
In fact, this bending is still very powerful. For example, take the 105mm tank gun in front of you for example. If the temperature difference between up and down is 20 degrees, the barrel will be bent, which can cause an error of 8 tight positions.
Perhaps ordinary people don’t know much about it, so if you count it, it will cause an error of eight meters at a distance of one thousand meters.
Eight meters! The body length of a tank, so because the upper and lower heat of the barrel is uneven, it can already cause a gap that cannot hit the target.
In hot areas, twenty degrees above and below are not a big deal. Even if the temperature difference is relatively small and only five degrees above and below can cause an error of 1.3. At a range of 1,000 meters, there will be 1.3 meters.
error.
This error is not small. For tanks, it is obviously not possible to hit a distance of 1,000 meters.
In particular, the longer the barrel of a tank gun, the more prominent this problem is.
Now, qualified thermal sheaths are not yet produced in China.
This thing, very simple to say, is a thin aluminum alloy plate, wrapped in a circle, wrapped around the outside of the tank, wrapped the tank inside, that is, just put a cover for the tank. After wearing the cover, I feel more confident
.
However, this cover is not simple. It must ensure the manufacturing process, it is double-layered, and the barrel must be evenly inside, so that an air interlayer is formed between the inner and outer layers, just like a double-layer thermos bottle
, the outer aluminum plate may be heated inconsistently, but the inner aluminum plate must be heated evenly, and a uniform temperature air interlayer can be formed between the inner aluminum plate and the gun barrel, so that the body tube is heated evenly, ensuring uniform deformation of the upper and lower parts, and reducing the bend of the body tube
improve shooting accuracy.
It is difficult to make an aluminum alloy board into such a shape. This is determined by the heat treatment process of aluminum alloy boards. It has been tried in China. After the heat treatment, the board will deform severely and welding cracks will occur.
Therefore, there is no good solution to this thing at the moment, but now, looking at the tank barrel of someone else, we use a simple and easy method.
The advantages of aluminum alloy are relatively light, but processing is difficult. Before the processing technology is breakthrough, you have to think of other ways. Don’t we like to use the civilized method the most?
Unexpectedly, it was the Israelite tank in front of me, and the problem was first solved by using the method of placing the horse on the horse.
People use asbestos!
Asbestos is also an excellent thermal insulation material. It is directly wrapped in an asbestos blanket and then fixed with a clamp on the outside of the gun barrel. Although it looks a little bulky, it can still solve the problem!
Seeing this thing, Qin Zhenhua's eyes lit up. The layman watched the fun and the expert looked at the tricks. After returning, he could use this method to make do with it first.
In fact, asbestos thermal sheath is not a new thing. As early as World War II, the German tanks and guns were fired far and accurate, and there were also the contribution of thermal sheath. Later, after World War II, tanks produced by various countries were also used.
This thermal sheath, including the 100-man captain tank in front of you, uses asbestos thermal sheath.
When the Israelis replaced this tank with 105mm tank guns, they naturally used this thermal jacket.
Qin Zhenhua's eyes shining, looking at the gun barrel, at this time, Mr. Tar also looked over and looked at Qin Zhenhua: "Although the tank you export is still an original 100mm tank gun, it has an armor-piercing ability.
But it has made great progress. I wonder what method you use. Can you introduce it to us? We are very interested. If you introduce it, we can also produce the thermal sheath of this gun barrel.
The whole process will be handed over to you.”
This time I came to inspect, the banner of the two sides was the military and technical exchange between the two sides. Since it was communication, we should not always look at each other, but also on our own. This is called communication.
And this tank gun is not something that our side needs to keep confidential, it is exported in large quantities, so even if it is said now, it is okay.
Qin Zhenhua said with a smile: "We have replaced this kind of tank gun with sub-caliber armor-piercing shells. Compared with the previous full-caliber armor-piercing shells, the performance has naturally improved a lot. There is no problem in piercing the chief's armor. After all, homogeneous steel
This is not good for armor. If the other party uses this explosion reaction armor again, then we will be powerless."
As he said that, Qin Zhenhua pointed to the brick-like devices on the tank. Those devices were fixed on the surface of the main armor in front, and looked like Tetris, which was created by the Israelis.
The name is the explosion reaction armor of the jacket.
Asbestos thermal sheath, you can see this thing, you can see it, there is no need to introduce it specifically. There is an asbestos blanket inside and a clamp outside. It’s that simple. Everyone came this time, but it was actually for this explosion reaction armor.
.
Hearing Qin Zhenhua's question, Mr. Tar smiled: "You are interested in this? As far as I know, many countries think that this kind of armor cannot be successfully studied, so they have given up on it.
, including the Soviet Union.”
It is not correct to say that the explosion reaction armor was studied by the Israelis. After all, this thing was actually available very early. In the beginning, it should have been the first conceived by the Soviets, but the most important insensitivity explosives, the Soviet Union
People can't figure it out, and later they gave up.
If we say that the first one to be used in actual combat is definitely Israel, there is no doubt about this.
This has something to do with their experience. In the Yom Kippur War a few years ago, Israel's armored troops suffered heavy losses and more than 300 tanks were destroyed. Therefore, they learned from their mistakes and decided to develop such a specialty model.
protection.
"Of course, it is a very effective way to improve the armor protection of tanks. In fact, our country is also developing similar reaction armor, codenamed FY-1. Perhaps, we can communicate with both sides of this kind of reaction armor."
Qin Zhenhua said: "This is the principle in our country..."
FY-1 means reaction-1. The domestic naming rules are naturally in Chinese pinyin. Now, the opponent's tank is being modified, so there are special racks for reactor armor on the tank armor, and some
It has been installed, some have not.
Qin Zhenhua picked up a piece of reaction armor from the other party from the side, like a big chocolate, and then pointed and gestured and explained.