Chapter 108 You will be the chief gunner!
With "single layer" as a reference reminder, this time Mr. He and the others knew what the word "single meat" was, so they crossed out "danrou" in the book and replaced it with "single meat".
Gao Zhendong continued: "Even if the ESR technology currently being used is used, after the steel ingot is produced, although the structure is dense, the composition is uniform, and the anisotropy is small, there will still be some minor defects, such as Shrinkage holes, cracks, etc. In the past, in order to ensure the performance of the gun, a layer of pipe was added to the outside, which inevitably caused problems such as large thickness, heavy weight, and low fatigue life of the gun.”
Mr. He and others nodded repeatedly. They all knew this, but how to solve it?
Gao Zhendong began to draw pictures on the paper. Mr. He and the others were excited and started to draw pictures.
Mr. Guan said that once Director Gao starts drawing, he will have something good.
People at the Prairie Tractor Factory now know that Gao Zhendong is the director of the No. 1 Research Office of the Technical Section of the Third Rolling Mill. He is the director at such a young age. No wonder he is so powerful.
Gao Zhendong said while painting: "So I thought if I could find a way to solve the problem in the barrel itself. My consideration is that after the boring of the barrel of the artillery is completed, on the inner wall of the artillery Apply a pressure that is much greater than the barrel pressure of the gun. Through this pressure, the thickness of the gun barrel will be thinned. The defects in the inner wall of the gun barrel will be squeezed out by this pressure, making the inner wall of the gun barrel tighter. Is it also possible? Achieving the effect of a traditional double-layered gun barrel that is hard on the inside and tough on the outside.” Mr. He and the others were immediately impressed. They used pressure on a single-layered gun barrel to produce the effect of a double-layered gun barrel. Why had they not done so before? think.
Mr. He nodded repeatedly: "Director Gao, your idea is so genius. I'll go back and think about how to apply this pressure."
Gao Zhendong continued to draw: "I have two ideas, you can refer to them."
Everyone at the Prairie Tractor Factory opened their mouths and looked confused: What? I haven't figured it out yet, but you have two? Did you even give us a choice? You are such a good person.
“The first one is to use the mechanical extrusion method, using a hard mandrel with a slightly larger diameter and pushing it through the hydraulic ejector to directly squeeze the hole completed by the boring. In this way, the above The advantage of this method is that it is less difficult to implement, safer, and the pressure requirements of the hydraulic press are not too high. The extrusion process is mainly completed by the mandrel. The disadvantage is that the inner wall self-tightening consistency and The uniformity is not very good.”
The people at the Prairie Tractor Factory no longer bothered to nod, and wrote down Gao Zhendong’s words as fast as they could.
After Mr. He finished writing, he raised his head and said to Gao Zhendong: "Director Gao, your idea is already very good. It is simple and direct, has low technical difficulty and is easy to implement. If we go back and follow this path, we will be able to do it soon. Conduct experiments.”
Gao Zhendong continued to talk about his second method: "The second method is to use a hydraulic press, which is hydraulically self-tightening. The barrel is filled with hydraulic oil and connected to the hydraulic press. The hydraulic press directly exerts pressure on the inner wall of the barrel."
Mr. He thought for a while: "Compared with the first method, this method has much better self-tightening uniformity and consistency, and the product performance is better."
Gao Zhendong agreed: "Yes, this is undoubtedly It is a more excellent technical method, but it also has disadvantages. It is technically difficult and requires higher pressure on the hydraulic press. If the pressure is too high, the tube may explode, instead of just blowing the barrel like the first technology. It’s just bursting. Fortunately, this technology has an advantage, that is, the pressure can be accurately controlled and can be gradually increased. In the long run, this method has greater potential.”
After comparing it for a long time, he felt that. All of them are good. After thinking about it, I want them all.
First use the mechanical extrusion method. This method is really simple and low-cost. The existing conditions are basically mature and it is very tempting.
Based on the existing conditions, we can get the benefits visible to the naked eye and suppress the old thing like Laoguan. With this method alone, we can already increase the power of the existing tank gun while keeping the parameters such as volume and weight unchanged. A big improvement.
At the same time, we will conduct research on the hydraulic method. Even if we can't get results in a short time, we can always get it done in a long time. When the time comes, we will upgrade the technology and continue to crush the old barriers. It will be flattering to think about it.
Thanks to the low cost of the mechanical extrusion method, both methods are being studied at the same time. The financial pressure is not great. Those with mature conditions will be used first, and those with advanced technology will follow. It is perfect.
After listening to Mr. He’s idea, Gao Zhendong also agreed. This is indeed a relatively stable and prudent plan. Gao Zhendong also joked: “Actually, the gun steel obtained by VIM+ESR is not the best. VIM+ESR+VAR (vacuum consumable arc melting) is better, but the cost of VAR is really high, the performance improvement is not big, and the price/performance ratio is too low, so it is unnecessary.”
How cost-effective is this. Low, for example, Hanscat's Rh120 tank gun uses VIM+ESR+VAR. Then when Citi introduced the Rh120, it found that the cost was too high, and then improved it and used VIM+ESR, and found that the performance It is enough, so VAR is omitted.
It's something that even Citigroup can't afford, and its low cost performance is evident.
When Mr. He heard this, he said, what, there are still masters? No matter what the price-performance ratio is, write it down first and then talk about it. Whether you use it or not is a matter for later.
Gao Zhendong took a sip of water and continued: "After talking about the cannon, I will talk about my thoughts on the bomb."
The people at the Prairie Tractor Factory were a little panicked. Director Gao Niu Bi, All-rounder, knows everything.
Mr. He looked like he was all ears: "Director Gao, please tell me."
"Mr. He, it's inconvenient to tell me, what kind of armor-piercing bullets are our tank guns using now?"
For people in Gao Zhendong's situation, there is no need to keep this question confidential, Mr. He said. Just answer: "Shedding sabot armor-piercing bullet."
Gao Zhendong understood clearly and asked Mr. He: "That is the way of sub-caliber armor-piercing bullet core. After the shell is ejected from the chamber, the shell is shucked to reduce the caliber and reduce the resistance. , increase the muzzle velocity, right?" Mr. He nodded: "Director Gao is a versatile man, he has a very deep grasp of the principles, and he even understood this at once."
Mr. He believed it. , Gao Zhendong has never really worked on tank shells, but he can understand the principles of armor-piercing shelling shells as soon as he hears the name. This is really amazing.
Gao Zhendong asked: "Have you ever thought about further increasing the aspect ratio?"
Mr. He shook his head: "Director Gao, you don't know something about this. When the aspect ratio of the shelling core exceeds After 5, the diameter of the projectile is too small relative to the length and cannot store angular momentum, making it difficult to maintain the rotation of the projectile. The flight stability and accuracy of the projectile will decrease, making it unusable."
Gao Zhendongxiao. Said: "What if I don't need to rotate for stability?"
"Don't need to rotate for stability?" Mr. He was a little confused.
“Yes, like rockets and missiles, they are stabilized by tail fins. It is called tail fin stabilized discarding sabots!!”
The world's first armor-piercing fin-stabilized discarding sabot (APFSDS) appeared on Da Maozi's T-62 tank in 1962. It is normal for domestic comrades not to know about it.
This sentence was like a thunderbolt, hitting Mr. He's mind. He felt like something was about to come out, but he couldn't catch it for a moment, which was very uncomfortable.
The tail is stable, so there is no need to rotate for stabilization, and the length-to-diameter ratio limit can be broken.
The larger the length-to-diameter ratio, the faster the muzzle velocity of the projectile and the longer the length of the armor-piercing body.
The longer the armor-piercing body is, the greater the weight will be and the better the speed storage performance will be.
The faster the speed and the better the storage speed, the deeper the penetration will be.
Although the penetration depth is not directly proportional to the length of the armor-piercing body as rumored in the future, within a certain range, the length of the armor-piercing body has a positive effect on penetration depth.
Mr. He felt that he had been taught a good lesson today. He thought that Gao Zhendong’s statement about increasing the length-to-diameter ratio was just a layman’s talk, but he didn’t expect that he had delved deeper than himself, thought more, and walked further. Far, this length-to-diameter ratio, people really added it.
It took a long time for Mr. He to come out of the shock and shame, and said to Gao Zhendong: "Director Gao, you really woke up the dreamer with your words! I am ashamed and admire you!"
At this time, a technician from the Prairie Tractor Factory asked: "Director Gao, but the rotation of the cannonball will affect the stability of the tailplane, won't it still cause instability?"
Gao Zhendong laughed: "Then we will use smoothbore cannons. Who said that rifled cannons must be used?"
When Mr. He heard this, he was wonderful! ! ! !
Rifled cannons eliminate smoothbore cannons because they can give the shells rotation, increase the flight stability of spindle-shaped shells, and greatly improve accuracy.
But I didn’t expect that here, Director Gao was ingenious and used the characteristics of smoothbore cannons to eliminate rifled cannons. Wonderful, wonderful.
Who said tanks must use rifled guns? The range of a tank gun is only a few kilometers. What kind of rifled gun is needed within this range?
With tail stabilization, the smoothbore cannon can fire very accurately, even surpassing the effect of rotational stabilization.
The smoothbore gun has a simple structure and is easy to process. It is perfect to match the self-tightening barrel. It is wonderful. Director Gao’s set of combos are interlocking and echoing from front to back. It is simply for tanks. The cannon was custom-made. Who the hell said that Director Gao had never learned anything related to artillery? I, Lao He, was the first to refuse.
Laoguan, just wait, I will go back this time, I will have everything to serve you!
Everyone at the Prairie Tractor Factory was dumbfounded by Gao Zhendong's set of skills, and they didn't recover for a long time.
A technician asked the last question: "Director Gao, what about other types of ammunition? Without rifling, other types of ammunition, such as anti-explosive grenades and armor-piercing rounds, will lose their rotation and cannot be fired. Are you sure? ”
Gao Zhendong laughed loudly, but before he could answer, Mr. He slapped him on the head: "You are stupid, just use the tilt tail to add rotation to them!!"
Why don't you say something? He is always the chief gunner. He reacts very quickly. He immediately draws inferences and found a solution to the problem.
Mr. He turned his head and held Gao Zhendong's hand: "Director Gao, don't say anything. You will be the chief gunner!"
(End of this chapter)< br>