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Chapter 1940 Self-tightening of the barrel

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    "The previous technologies were all started from the outside, can we start from the inside?" Qin Baoshan said.

    Whether it is winding the iron wire outside the barrel or adding a layer of pipe outside the barrel, it is actually equivalent to doing it outside.  When the gun is fired, the gas inside the propellant will push the barrel, causing the barrel to expand.  If it is pushed to a certain extent, the barrel will explode.  But now, add another layer on the outside. When the gun barrel expands, the outer layer is responsible for tightly holding it to prevent it from expanding.  This is how it was used before.  But now Qin Baoshan is talking about another way: start from the inside.

    In fact, what really bears the pressure of the propellant is the inside of the barrel of the tank.  The outer hoop layer is not directly subjected to chamber pressure.  If the inner wall of the barrel is made denser, the chamber pressure it can withstand will be greater.

    Qin Baoshan proposed a new solution to the problem: starting from the inside.  This plan made Lu Da's eyes shine, and he said to Qin Baoshan, "Go on."

    "Specifically, we use a plug." Qin Baoshan said very simply: "When we manufacture the gun barrel, we put the plug in. The plug needs to be thicker than the gun barrel. For example, we plan to  To make a 50mm caliber tank gun, then we first make a 48mm caliber bore. Then the plug, we made it into a 50mm caliber. The shape of the plug is the same as that of a thermos bottle, but it must be extremely hard  , and then we can force this plug through our gun barrel and expand it into a 50mm barrel."

    Lu Da's mind was thinking rapidly, and he said to Qin Baoshan: "The processing of the gun barrel needs to be very precise, so if we hit it with a hammer, it will definitely not work.  The wall will definitely deform. If we want to get this plug through, then we need to use hydraulic presses in the back."

    Sure enough, it is powerful, and Qin Baoshan can understand it at any point.  At this time, Lu Da continued: "In this way, the inner wall of the gun barrel will be squeezed in by us. The inner wall will also be denser, which will increase the ability to withstand the propellant."

    At this time, Lu Da was very excited. Compared with the previous manufacturing plan, this one was simpler, and only needed a high-power hydraulic press and a plug.  There are such things as hydraulic presses in the Xiagou Iron Works of the Eighth Route Army. As long as the forging equipment is modified, those hydraulic presses can be used.  Even if you can't press it once, you can do it several times.

    The barrel is made in this way, because the inner wall is very dense, so when the shell is fired, it should be able to withstand a fairly strong chamber pressure.  I really didn't expect Qin Baoshan to solve the problem in this way.  At this time, Lu Da wanted to try it immediately.

    In fact, the solution Qin Baoshan mentioned was the self-tightening process of the barrel that was commonly used when making cannons in later generations.  In addition to this process, there is another one is electroslag remelting steel.  Although the Eighth Route Army already has certain power plant equipment here, there are still many technical difficulties in the manufacture of electroslag remelted steel.  So Qin Baoshan didn't intend to let Lu Da and the others use electroslag remelting steel to make cannons.  Only using the self-tightening process of the barrel should be able to solve the production problem of the 50mm tank gun.  If there is a chance in the future, maybe they can study this technology again.

    Qin Baoshan thought of something, and continued: "When we manufacture guns, we already have chrome-plating technology. When we manufacture tank gun barrels, we can continue to use this chrome-plating technology, which can continue to improve the durability of gun barrels.  The degree of grinding. As for the metal chromium we need, we can find a way from the Americans."

    In the past, they purchased it from the Soviet Union, and it took a lot of effort. The Eighth Route Army couldn't extract this rare metal by itself, so now they simply get it from the Americans.

    Lu Da nodded: "In this way, if we start now, we should be able to make a batch soon."

    Lu Da originally thought that this kind of cannon could not be manufactured due to production process problems, but now Qin Baoshan has proposed a new solution, which should be able to meet the production requirements. In this case, they can also produce a batch.

    Qin Baoshan nodded: "We will do our best to ensure the production of this kind of gun. After all, no one knows when the little devil will come. If our tank can't be built, then we can only use this kind of tank gun first.  Yes. Add a gun mount to it, and it¡¯s an anti-tank gun.¡±

    Qin Baoshan has to prepare with multiple hands. Of course, he hopes that the tank he designed can beat the little devil's tank wildly.  But at the same time, Qin Baoshan also knew in his heart that the tank was too complicated after all, and they might not be able to make it.  If they can't catch up with it by then, they will have to use this anti-tank weapon.?? It's shot.

    Qin Baoshan does not recommend the use of rocket launchers, because the rocket launchers have to be close to a distance of 100 meters.  When the little devil's tanks came in large numbers, the distance of 100 meters was too dangerous.  But if you use anti-tank guns, then don't worry.  Anti-tank guns have a range of at least two or three kilometers, or even farther.  Even if it is used within one thousand meters to ensure accuracy, it is enough to knock down the little devil's tank.  Especially the little devil didn't know that the Eighth Route Army had such advanced anti-tank guns.  So the little devil won't be on guard.  Time to ambush these anti-tank guns.  After encountering the little devil, if you suddenly fire and shoot, you will definitely catch the little devil by surprise.

    Anyway, Lu Da had worked in Krupp before, how to install the gun mounts for this kind of tank gun is Lu Da's business.  Qin Baoshan has already explained the matter, and the next step is Lu Da's job.

    When it came to this, Qin Baoshan already had a lot of emotion in his heart.  In the past, the Eighth Route Army could only make crude weapons by itself.  The 81-type horse rifle produced, after firing hundreds of bullets, the gun bursts out. Now they can not only manufacture advanced automatic rifles, but also can make guns, not only 20mm machine guns, but now they are about to  A 50mm anti-tank gun was manufactured.  This is a huge leap forward.

    Under the leadership of Qin Baoshan, the military production of the Eighth Route Army is constantly developing.  Qin Baoshan is also full of confidence in the future.  (Remember the site URL: www.hlnovel.com
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