The most important thing about artillery is the barrel, the anti-tank gun is different from other guns, his requirement is that the higher the muzzle velocity, the better, which makes it extremely high for the wear of the breech. And once the bore of this anti-tank gun is seriously worn, it must be replaced, otherwise it will seriously affect the accuracy. This was fatal for gunners who needed to accurately hit tanks that might be moving.

Although the amount of steel produced by the steel plant in the border area is rising, it is still difficult to produce special materials such as cannon steel, which needs to have extraordinary high temperature resistance, excellent strength and excellent toughness. At the same time, it is also necessary to fully consider the cost factor of mass production of artillery. Modern artillery barrels are made of alloy steel. It is often dominated by medium-carbon, nickel-chromium, and platinum-based alloy steels. There is also a small amount of vanadium added to make modified steel. But in terms of resources, China is also a country with a serious shortage of nickel. Later, it was Jiang Cheng who brought some rare earth minerals from later generations to the steel manufacturing to solve the production problem of cannon steel.

Song Wu nervously watched the valuable barrel embryo come to the large drilling machine, which is one of the most important steps in the barrel processing, drilling.

An old worker from the Taiyuan Gun Factory was nervously operating the machine, the fire was shining, a prefabricated hole was completed, and then, the gun barrel came to a huge boring machine, this time the master was a Jewish worker from the Czech Republic, several Chinese workers around him carefully observed his movements, the delicacy and difficulty of deep hole processing lies in the "deep". In the process of deep hole machining, the operator cannot directly observe the cutting and other processes. At the same time, it is necessary to ensure that the processing is carried out with a high degree of precision. Moreover, slender pipe fittings are also prone to bending and deformation during processing. Therefore, it is extremely difficult to process. Because the quality of the bore processing of the barrel is closely related to the shooting accuracy, life, and safety of the whole gun. Therefore, the dimensional tolerance, bending, roughness and other aspects of the processed are extremely high. It can be said that deep hole processing is a prominent feature of artillery manufacturing technology that is different from ordinary machinery manufacturing, such technology is still lacking in Yan'an workers, in order to succeed in the experiment, so this time it is still the old workers who have worked in the Czech artillery factory.

Slowly, the drill bit got deeper and deeper, and the Jew squinted. After careful observation, it took a while to say in broken Chinese, "Okay, this, that's it." The small notebooks of the workers next to them were already full of what they thought were the key points of operation.

The barrel then goes through a finishing and self-tightening process before being assembled.

Parts of several more production lines were also received in turn to the assembly line, and a 37 anti-tank gun was produced in this way. By this time the day had passed. Everyone's stomachs were rumbling, but no one wanted to eat.

Looking at the shiny 37 guns, Song Wu excitedly touched them and said, "Okay, that's it, our production line is well deployed, let's try the guns." ”

The crowd was not tired, and took advantage of the night to pull the cannons. When I came to the test site, an iron plate tree was raised.

"Let's try the original German shells first, and then try our imitation shells to see if there are any gaps." Zhu Yusheng proposed.

"Okay, this way we can experiment with both our artillery and the quality of our shells, killing two birds with one stone." Song Wu said approvingly.

Anti-tank guns were made by workers, and how they could be used naturally did not bother them. They quickly adjusted the artillery, for safety. Everyone was hiding in the bunker, and the arquebus was stretched into the bunker and pulled again.

The huge air pressure created by the "boom" primer fire pushed the shell out violently, and the rifling in the barrel made the shell rotate continuously in the advance to enhance the accuracy of the shell, and everyone ran nervously to the side of the gun.

"It didn't blow up, it didn't blow up. Our guns didn't blow up!! After carefully observing it with a flashlight, Zhu Yusheng excitedly hugged Song Wu and was about to kiss, so frightened that Song Wu covered Zhu Yusheng's mouth, "Wait, it's only one shot now, you have to shoot a few more shots!" ”

"Yes, yes, yes. You're right. Zhu Yusheng reacted at this time, and he was a little excited too early.

One, two, and three shells, accompanied by the sound of artillery bombardment one after another, were the cheers of Zhu Yusheng and others, and by the time the sky was bright, they had already fired more than 40 shells.

"It's okay, I see that the quality of our artillery has passed, let's go and see how well the shells are fired." Song Wu stopped the artillery and said, with his gaze, everyone found that so many shells had been fired, German-made, Yan'an-made, high-explosive shells, and armor-piercing shells had been experimented, looking at the cannon shells, they couldn't help but feel a little distressed, how many devils can this kill.

Everyone came to the opposite side of the test firing range, and saw the steel plates that had been put away one by one, comparing them with the bullet holes on them, Song Wu shook his head and said, "There is still a gap, our penetration depth is seven or eight millimeters shallower than that of German shells, but when we use German shells, there is not much difference between them and the original guns." ”

Zhu Yusheng analyzed: "I think it's still the reason for the warhead, I think we can write a report." ”

-- Yan'an

Wang Fei is Mr. Peng's personal guard, this time he came to Yan'an to carry some intelligence from Shanxi to the central government, he also got three days of rest after a long journey, he came to the streets of Yan'an, ready to buy a little something to bring back to the army, after all, Yan'an at this time, because of the large production and stable environment, the materials are relatively rich, and there are many things, and some are Jiang Cheng from the later generations to bring daily necessities to enrich the market.

Suddenly, a figure walked by, and a small red bag fell in front of him, Wang Fei hurriedly squatted down and picked it up, only to feel a faint fragrance, he hurriedly looked around, wanting to return it to the owner, but he couldn't find anyone.

Wang Fei hesitated for a moment and shouted loudly, "Which comrade dropped the bag?" Red bag! Everybody checked, I picked up a red bag. ”

Everyone touched their pockets without worry, and suddenly a female voice came, "I'm sorry for that comrade of the Eighth Route Army, this bag is mine." ”

Wang Fei looked back, but saw the face of a 26 or 7-year-old woman, wearing shabby but clean clothes, with a beautiful face, but it was Yoshiko Kawashima.

"You tell me what's in there? I'll take a look at it, and I'll give it back to you if it's right. Wang Fei secretly glanced at the inside of the bag and said.

"There are more than three yuan, as well as my card, and my documents, my name is Jin Yuhui." Yoshiko Kawashima lowered her head and said shyly.

Wang Fei looked at Yoshiko Kawashima with a red face. couldn't help but be moved, and hurriedly lowered his head, turned around, handed the bag to Yoshiko Kawashima and said, "That's right, here you go, be careful." ”

Yoshiko Kawashima said gratefully, "Thank you so much, I don't know what to do if I lose it, can I invite you to dinner?" ”

Wang Fei hurriedly shook his head and said, "Our Eighth Route Army is disciplined. I can't eat your people's. ”

Kawashima Yoshiko secretly hated in her heart, and said in her mouth, "That's not good, that's not good, I look a little younger than you, I think you're the big brother, my sister invites my brother to dinner, you don't have anything to say, right?" As he spoke, he grabbed Wang Fei's hand and walked towards the restaurant.

Wang Fei was born as a tenant, and was chosen by Mr. Peng to be his personal guard because of his honesty, and he had little experience in dealing with women, facing Kawashima Yoshiko's enthusiasm. I was anxious, shy and dry, and I wanted to shake off Yoshiko Kawashima's hand, but it seemed that my body was soft and I couldn't shake it off.

"What, Brother Wang, do you dislike me for being ugly and don't deserve to be your sister?" Yoshiko Kawashima's eyes were red as she spoke, and Wang Ji, who was watching, hurriedly said, "No, no." I don't know what to say, I really can't let you invite to dinner. That's okay, I'll invite you to dinner, okay? Ah, don't you cry, I was wrong, I apologize to you. As he spoke, he saluted him.

Yoshiko Kawashima burst into tears and laughed, pointing at Wang Fei and laughing, "Like a fool." Then you won't invite me to dinner? ”

Wang Fei shyly looked at Kawashima Yoshiko who was receiving the award on the stage, after meeting Kawashima Yoshiko for a meal, the two said goodbye to each other, in this war era, Wang Fei still thought about this wave and didn't know when they would be able to meet. There is still a little regret, but in the next two days, he kept meeting Yoshiko Kawashima, by the Yan River, on the road, in the market, if it weren't for the fact that there was always a little girl named Yunyun talking to Jin Yuhui next to him, and even once Jin Yuhui simply didn't see him walk over, he had to think that this was Jin Yuhui's intention. But now he can't help but think that God is hinting at something, he is also 27 years old, and it is also suitable for Kawashima Yoshiko, who looks only 26 or 7 years old, of course, he also remembers that he is a soldier of the Eighth Route Army, and the regulations of the 258 regiment are firmly in his mind, he is already over 25 years old, and he has been a soldier for 8 years, but the level is not enough, he is already thinking about whether he will go back this time and ask Mr. Peng for instructions to the troops, make more achievements, and then be promoted to the regiment commander to get married.

He clapped his hands while fantasizing about what he would look like when he got married, and the appearance of the girl next to him became clearer and clearer, which one was not Yoshiko Kawashima.

-- Taiyuan

Two days have passed, the artillery of Yanmen Pass has no sign of stopping, the Japanese army seems to have an endless supply of shells, and the entire Yanmen Pass position has been bombed to pieces, if it were not for the large number of hidden forts and tunnels established by the Eighth Route Army at that time, the Jin Sui Army beat the Japanese charge again and again, Yanmen Pass may have been lost.

"Chief Yan, Chairman Jiang asked us to hold on for another half a month, Wei Lihuang's troops have already begun to be dispatched, it is Liu Maoen's department of the 14th Group Army, and now it is out of Zhongtiao Mountain." Yang Aiyuan said excitedly to Yan Xishan.

Yan Xishan nodded with satisfaction and said, "Yes, there is still Xinkou after the Yanmen Pass, and it is not a big problem to persist for half a month." ”

"Report, urgent military intelligence." A communications soldier saluted and said to Yan Xishan.

Yan Xishan took a look, the pupils in his eyes dilated suddenly, he walked quickly to the map and looked at it, his brows suddenly turned into eight characters, and he stomped his feet and shouted, "Ah! Hit the little devil's voice again, the devil is not going to go to Xinkou, they are walking Jingle! ”

Yang Aiyuan hurriedly asked, "Chief Yan, what happened?" ”

Yan Xishan handed the telegram to Yang Aiyuan and said, "The telegram from the Eighth Route Army says that their planes have discovered a large number of Japanese troops between Ningwu and Jingle and are marching south. ”

Yang Aiyuan said in disbelief, "Impossible, Ningwu's defenders have been sending normal telegrams these days!" Quick, come on, power generation Ningwu! ”

After a while, another telegram from the enemy came to Yan Xishan and the others.

Yan Xishan shook his head and said, "The Eighth Route Army will never make such a joke, I believe that Ning Wu has really lost." ”

Yang Aiyuan shook the telegram and asked, "Then how should we explain this?" ”

Yan Xishan smiled bitterly, "How else can you explain it?" Ningwu's telegram and transmitter should have been captured by the Japanese army, this was sent to us by the devil! You send electricity, just say, Ning Wu's little devil, Lao Tzu knows it's you, you wait, Lao Tzu will twist the emperor's head off and kick it into a ball. ”

Yang Aiyuan wiped the cold sweat on his head and nodded, and after a while, the telegram responded, "Eight Grid Tooth Road!" ”

Yan Xishan closed his eyes, sat down slowly, and said, "How many people have we arranged on this road?" ”

Yang Aiyuan lowered his head and said, "There is only one army. ”

At this time, Yan Xishan had eleven armies, but the total strength was only a little over 100,000, and one army was less than 10,000.

Yan Xishan shook his head and said, "Tell them the situation immediately, let them prepare for battle, and mobilize troops to go to Gujiao, other places are too far away, we can't take care of them."

After speaking, Yan Xishan asked again, "What about the Eighth Route Army?" Haven't they sent troops yet? ”

Yang Aiyuan shook his head and said, "The Eighth Route Army replied that they have already been dispatched, but it is only a military secret, and they can't tell us the specific situation, and our people have also found that they do have signs of gathering troops." But we can't find out the specifics. ”

Yan Xishan sighed, he couldn't help but feel like he was in a glass bottle, others could see what he was doing, what he was doing to others, but he didn't know if he was really old?

On the other side, Jiang Cheng came to Yan'an again.

Jiang Cheng looked at the report handed to him by Chairman Mao and nodded, "Yes, our anti-tank gun production can already start, but there is a gap between the armor-piercing shell and the German original, mainly in the quality of steel, but our steel plant has not even met our requirements, let alone the quality, we still have a long way to go." ”

Chairman Mao nodded and said, "I asked Ren Chi to prepare a material for Shanxi's industrial development, and I have to trouble you to make a few more trips." ”

Jiang Cheng said with a smile, "Rest assured, the chairman guarantees to complete the task, this time we will lay down Shanxi, and the foreign and overseas Chinese are all cheering, and the support for us is also greater." ”

Chairman Mao shook his head and said, "It's not over yet, Mr. Zhu and Mr. Peng are still commanding on the front line, and we have to fight another big war, our air force has been under pressure recently, see if you can add some planes." ”

Jiang Cheng immediately said, "Okay, I'll start acting immediately when I go back this time." ”

Jiang Cheng returned to his residence and came to Yanhe with Yu Yishan for a walk, Li Qian behind him followed behind Jiang Cheng, there are still so many people in Yanhe, from time to time there are central leaders waving to Jiang Cheng, due to the large number of people, they don't speak, such behavior is very common in Yanhe, after all, most of the people who come here are Red Party members and students, everyone looks down and doesn't look up, many of them are acquaintances.

Not far from Jiang Cheng, Wang Fei and Kawashima Yoshiko are also walking, Wang Fei is stupid, he only knows how to listen to Kawashima Yoshiko chatting about strange things, every time an acquaintance laughs and jokes about Wang Fei, Kawashima Yoshiko will stand up and speak for Wang Fei, so that Wang Fei has more and more good feelings towards Kawashima Yoshiko, and the gaze in his eyes is getting softer and softer. (To be continued.) )

PS: Because of the VAT reform, the workload has been too large recently, and the update cannot be guaranteed, sorry.