my scientific age

Chapter 231 Gun barrel blank!

"Junior, please stay." Just as Yu Hua was about to get up and leave, a voice suddenly came from behind.

Yu Hua turned his head and felt that all the seniors in the class were looking at him with some doubts. He looked at the freshman senior who made the voice and asked, "Uh, what's the matter with the senior?"

Although Yu Hua and these students are both freshmen, the other is already in the second semester of freshman, and Yu Hua's student status is only in the first semester of freshman, so he can be called a senior.

"Junior Yu, it's nothing, I just want to ask you, how do you know so much about Lebesgue points? According to common sense...you should still be learning points." With a look of embarrassment on his face and a little embarrassment, he asked Yu Hua.

Respect in the words.

He didn't bully the weak with guns, and he didn't provoke without brains. Instead, he seemed more respectful, because after this class alone, he and the other seniors all understood that this junior who has only been here for two days has real skills, knowledge and mathematics. Achievements are no less than theirs.

It is true that the back waves of the Yangtze River push the front waves, and the blue is better than the blue. I didn't expect this little boy to be so powerful, and they will master the Lebesgue points one step ahead.

"Uh... I don't know how to explain this question very well. The Lebesgue integral is quite simple, and you can get started by mastering the rules." Yu Hua scratched his head when he heard this, not knowing how to answer, so he casually explained his understanding.

The senior's mouth twitched slightly: "..."

What is quite simple?

You think it's very simple, why do we learn it like reading a book from heaven?
Co-author you are smart, we are all idiots?
In an instant, the atmosphere in the classroom became slightly weird.

"I'm sorry, I really think it's very simple. If seniors want to learn Lebesgue points in depth, they can refer to the "Reconstructing Lebesgue Points" I published in the Tsinghua Journal, which can be understood in all directions. The learning of real variable function theory and complex variable function theory has laid the foundation." Feeling the changing atmosphere in the classroom, Yu Hua felt a little helpless, looked at the senior who asked him questions, and decided to spend a little more time in order to maintain a good relationship with his classmates.

To be fair, I really didn't want to pretend to be coercive. This kind of low-level interest is meaningless in the window period of just over a month before the full-scale war of resistance.

Is it cool to engage in academic research and weapons research by pretending to be coercive with classmates?

Obviously not.

As a new mathematical knowledge born in the 20s, the Lebesgue integral is indeed an advanced mathematical knowledge content for the mathematics level of this era. The article on reconstructing the Lebesgue integral written by Yu Hua reduces the need for this knowledge point. Understanding the difficulty makes it easier for people to get started.

After all, the next stage is the extremely torturous real variable function and complex variable function. If the Lebesgue integral is not learned well, the foundation will not be solid. It really takes ten times to learn the real variable function.

"You published an article in the Tsinghua Journal?!" The senior was confused, his eyes widened, revealing disbelief.

The atmosphere in the classroom became different again, this time it was not just one person, but a group of people.

All the freshman students of the Department of Mathematics, National Tsing Hua University, all stared at Yu Hua blankly.

Others don't know the weight of Tsinghua Journal. As students of this school, don't they still understand it?

This is the top academic journal in the country.

"Seniors, I still have something to do, so I'll go first." Yu Hua looked at everyone's reaction, sighed, and decided to give up the idea of ​​explaining. No matter what they said at this time, they would think they were showing off.

The words fell, and walked away.

After Yu Hua's figure disappeared, everyone in the classroom reacted and barely digested the shocking news revealed by Yu Hua.

"Niang Xipi, what is the origin of this junior, he actually published an article in the school's journal! This is the school's journal!"

"The key is that they still publish mathematical articles!"

The atmosphere suddenly became lively. As the top academic journal in the country, the school's journal has a very strict review of the quality and content of articles. The submission rate is as shocking as the elimination rate of students last year. The highest is the Department of Mathematics.

The articles in the Department of Mathematics are known for being esoteric and unfamiliar. The average person cannot understand the content of the article, and cannot understand the logical relationships and formulas. Those who can understand it can be called extraordinary.

As for hands-on writing a math article and publishing it in a journal…

Such a beautiful thing, as all the freshmen of the National Tsinghua University Department of Mathematics, the six of them never thought about it at all, right? !

"Edi-niang... The school's journal published an article. I'll go check it out later. No, I have to go to Yangchunyuan at noon to be shocked. My heart can't take it anymore."

"Let's go together, we seem to have a big man in the Department of Mathematics."

"Add me, it's been [-] hours since I last went to Yangchun Garden. I feel like I have lost contact with the world and I need to establish a communication channel urgently. Having said that, I'm going to change my major. Mathematics is really not something that anyone can do. I did, I thought I could learn math, but in the end I didn't learn anything."

"Hey... Who says it's not, as long as you don't have a little bit of knowledge, the things taught in the following courses will not change at all. Also, the textbooks in Princeton are too difficult to learn, so I kind of want to transfer to the Department of Civil Engineering."

……

At noon, I finished my meal and replenished my energy. Due to my status as a student, there were not many courses arranged by the school during this time. Yu Hua went directly to the library and continued to study the first set of encryption algorithms.

In order for asymmetric cryptography to enter the practical stage, one is to have an encryption algorithm, and the other is to formulate an algorithm password table, that is, the corresponding numbers and text language after decryption.

Yu Hua uses two language systems, the northern Mandarin and his hometown dialect, which can improve confidentiality and versatility to a higher level.

This is a huge and time-consuming project, thanks to Yu Hua, who has extremely terrifying computing power, can do this alone.

Under normal circumstances, if you want to build a set of encryption algorithms and algorithm password tables, you must use ten coding experts and hundreds of related personnel to form a team, which takes at least three months to complete.

"Phew... the encryption algorithm is here for the time being, go to the machine shop for a walk." After two hours, Yu Hua, who had exhausted his time for efficient study, had to choose to suspend his research work, pack his personal belongings, get up and leave, and went straight to Mechanical Hall.

Yu Hua is still very interested in the homework assigned by Professor Zhuang Qianding before, mainly because he can take this opportunity to use the precious general turning and gantry milling.

The general lathes and gantry milling machines belonging to the Department of Mechanical Engineering are placed in the Mechanical Hall for teaching and use by the students of the Department of Mechanical Engineering. Of course, students like Yu Hua who take mechanical engineering courses can also use it logically.

You must know that American-made imported ordinary cars and gantry milling machines in this era are very heavy, extremely expensive and rare. The school specifically stipulates that non-mechanical engineering students and elective students are not allowed to use these two equipment.

After leaving the library, Yu Hua came to the entrance of the majestic mechanical building with a brick-concrete structure. After checking the student ID card by the guard, he entered the building with a curious heart.

To be fair, this is the first time he has entered the mechanical hall.

The Department of Mechanical Engineering has set up three laboratories in the museum, which are divided into power engineering group, mechanical manufacturing engineering group, aircraft and automobile engineering group. Yu Hua is going to the laboratory of the mechanical manufacturing engineering group.

According to the internal instructions, Yu Hua quickly came to the laboratory where the mechanical manufacturing engineering team was located, which was like a factory workshop. Looking around, the laboratory was bright and spacious, with two machines and equipment exuding industrial beauty in the middle. The sound of metalworking machinery and motors running came from his ears.

Professor Zhuang, wearing a greasy grey overalls, was standing in front of the general car and was manipulating the equipment to process metal parts.

Yu Hua stepped forward, stood outside the safe area, waited quietly, didn't make a sound, and with a learning mentality in his heart, carefully looked at and observed Professor Zhuang's operation process.

Regarding machine tool manufacturing, Yu Hua is in a state of limited knowledge, he understands a little, but not much.

The three-jaw chuck installed on the spindle of this general turning machine firmly clamps and fixes a silver metal rod in the shape of a disc and rotates at high speed. metal comes out.

It can be seen that Professor Zhuang's operation is very subtle, and the amount of knife feeding and back eating is not large.

"It seems to be processing a rotor." Yu Hua carefully observed the shape of the parts on the three-jaw chuck, like a rotor, but it was unclear what type of rotor it was.

He looked around and looked at the laboratory of the mechanical manufacturing engineering group. The gantry milling machine next to him was like a behemoth, much larger than the general car in the same laboratory. The width of the gantry was about two meters, and the length of the worktable was three meters. About 2000 mm × 3000 mm workpieces can be milled.

This gantry milling machine cannot be manufactured at the level of machinery manufacturing in the Republic of China.

Although the performance and quality of American machine tools are not as good as those of German machine tools, they are much better than those made by the Republic of China.

Yu Hua looked away from the gantry milling machine. At this moment, the metal bars piled up not far away suddenly attracted attention like gems. Seeing this, the whole person suddenly lit up.

Metal bar stock!

Yu Hua left his position and came to the pile of metal bars. There were about [-] of them. He squatted down and picked up one of them. It was about sixty centimeters in length and one centimeter in diameter. The surface is smooth and clean, without defects such as obvious cracks and bubbles.

This is a metal bar processed by the forging process. It is of good quality and is very suitable for making a core part of a machine...

barrel!

At this moment, a gentle and familiar voice came from behind: "Be careful, these experimental materials are expensive."

"Hello, Professor Zhuang, I'm sorry for causing you trouble." Yu Hua quickly put down the metal bar, stood up, and turned to say hello to Zhuang Qianding.

"It's just the two of us here, don't be restrained, do you know what these experimental materials are?" The lathe not far away had been suspended. Zhuang Qianding, who was covered in dust and oil, smiled and pointed to the metal bar on the ground. , asked Yu Hua.

Is this experimental material?

If this is left in the future, the barrel of the gun is processed in the university, and it cannot be sentenced to three years or five years.

Yu Hua glanced at the experimental materials on the ground, was silent for a second, and said bluntly: "If the students guessed correctly, these should be gun barrel blanks."

"I have knowledge, but I didn't expect you to know the barrel blank. Most people think that the gun barrel is made of seamless steel pipe, but they don't know that the real gun barrel is actually made of blank material. The barrel made of seamed steel pipe has an effective life of only dozens or hundreds of rounds, which is one-tenth of the barrel stock."

Zhuang Qianding was a little surprised. He didn't expect Yu Hua to have such insight. He squatted down, picked up the barrel blanks that had been sitting for a long time, and said with emotion: "These gun barrel blanks are high-quality alloy steel imported from the United States, which have been forged and anti-corrosion treatment. , high strength, high temperature resistance, corrosion resistance, this high-quality alloy steel material has very good performance, can be processed with a diameter of less than 8 mm, and the thickness of the pipe wall can reach 2 mm. It is a pity that our country is currently unable to smelt this It is a kind of high-quality alloy steel, and it does not have the processing technology. For the rest of your life, do you know how much each barrel blank is?"

"I don't know." Yu Hua shook his head gently.

"$15 per stick, about 60 yuan, the top is my monthly salary." Zhuang Qianding shook his head and sighed.

Yu Hua heard the words, and there is no surprise in his heart. The price of this weapon-grade metal material is expensive, especially the barrel blank. If it is the gun barrel blank, the price can increase by two levels in the form of orders of magnitude, reaching as much as a hundred times. .

The price of ordinary steel is 120 yuan per ton, and the price of high-end metal materials such as gun barrel steel and gun steel easily exceeds [-] yuan per ton.

The point is, there is no market for price.

Steel is a strategic material, and high-end steel is the most strictly controlled existence in the strategic material system.

"Sir, this price shouldn't be the current price, right?" Yu Hua asked.

"It seems that you are very familiar with the barrel blanks. That's true. These are the blanks imported in December last year. The total quantity is [-]. This year, the price is estimated to have at least doubled." Zhuang Qianding nodded. , said.

Yu Hua shook his head, and then curiously said, "The situation in Peiping has been tense and prices have risen recently. The students are just guessing. By the way, Professor Zhuang, why didn't these blanks be processed into gun barrels?"

"It can't be processed. The school originally planned to use this opportunity to cultivate students' ability to process gun barrels. Last year, they planned to buy a drilling machine and deep hole gun drill from the Americans. As a result, before signing the contract, the other party suddenly opened up, thinking that after we purchased the drilling machine, the other party suddenly opened up. It will be imitated, and the price will be directly increased by five times, and it is required to purchase more than ten units at one time, pay all the money before sending the equipment, and finally the school can only give up the purchase of drilling machines and deep hole gun drills.”

Professor Zhuang slowly gave the core reason, with a hint of helplessness in his tone: "So these [-] barrel blanks have been placed in the laboratory for half a year, but these gun barrel blanks are naturally placed for more than half a year, and the internal The stress is relieved very well, and if it is machined into the barrel, the accuracy will be higher.”

Subject to others.

What you don't have, you will get stuck by others.

The barrel blank material is limited, the processing technology is limited, and the equipment for making the barrel is also limited.

Drill presses and deep hole gun drills.

A piece of equipment and a tool are the core equipment for processing gun barrel blanks. Without these two things, gun holes cannot be drilled.

"Professor Zhuang, the student has a proposal." Yu Hua heard this, thought about it, and looked at Zhuang Qianding in front of him.

Zhuang Qianding heard this and said, "You tell me."

"We use this lathe and gantry milling machine to make deep-hole gun drills, and then use the deep-hole gun drills to process these barrel blanks to make gun barrels." Yu Hua looked at Zhuang Qianding and explained his original idea. Today, he originally came to the Machinery Hall for a stroll and toured the interior, but now he happened to meet this opportunity, and he might as well stop doing it.

"Using a lathe and gantry milling to make a deep-hole gun drill? How to solve the material for the drill bit? Besides, even if we have a drill bit, we don't have a drill press." Zhuang Qianding was stunned when he heard this, his eyebrows wrinkled slightly, and he was interested. , and feel unrealistic.

The material of the drill bit is the same as the barrel blank, which belongs to the high-end steel products, and the output is very small, but it is generally not bought.

"Professor Zhuang, this is the ready-made deep hole gun drill material. As for the drilling machine...you put the gun drill on the chuck, and then put the blank on the tool rest and tailstock, and then the barrel can be processed." Yu Hua He picked up a barrel blank with his right hand, and revealed the idea of ​​'work' that he had already conceived: "After processing the inner hole, use a broach to process it and pull out the rifling."

The job that Yu Hua originally planned to submit was to let the organization use an electric arc furnace to smelt two metal bars, one to process the gun barrel, and the other to be processed into a deep-hole drill. After turning and milling, the processed deep-hole gun was drilled and placed On the lathe chuck, the basic conditions for barrel processing can be met.

This idea is feasible, after all, in addition to the name of the industrial mother machine, the lathe also has the title of 'bench drill'.

The laboratory suddenly fell into silence, Zhuang Qianding was stunned for three seconds, and then showed a ghostly expression, looking at Yu Hua with an incredible face, and was deeply shocked by it.

At this moment, time seemed to stand still.

At this moment, Zhuang Qianding hardly knew what to say.

Shocked, surprised, puzzled.

"Yu Hua, where did you get this method?" After a few breaths, Zhuang Qianding reacted from his daze, took a deep breath, and stared at Yu Hua with his eyes popping out, his words revealing a hint of urgency and sympathy. Excited, he called him by his name.

"Professor back, the students thought about it themselves. You assigned the homework before, and the students were going to use this method to build a gun barrel. I didn't expect to encounter it today." Yu Hua replied softly.

"Wizards, really geniuses, your processing method has a very high feasibility. For the rest of your life, do you have a class in the afternoon?" Zhuang Qianding became more and more surprised and delighted. He carefully verified the processing method given by Yu Hua in his mind and confirmed that it was feasible, hurry up asked.

Yu Hua shook his head and said, "The students have no class."

"Then let's process this batch of gun barrel blanks together. After success, I will apply for a scholarship to you from the school. In addition, if you pass my elective courses, even if you pass a blank, you will be given full marks. Let's show the group of Americans. , even without them, we can process the barrel ourselves." Zhuang Qianding took a deep breath, looked solemn and dignified, made a heavy promise to Yu Hua, recalled the scene of the negotiation when purchasing the drilling machine equipment, and gritted his teeth.

"Uh... Okay, Professor Zhuang." Yu Hua was humble and reserved when he heard Professor Zhuang's promise, but he was about to refuse, but the words reached his throat but he couldn't say it.

Without him, Professor Zhuang gave too much.

There are really too many.

This is full marks for scholarships and electives. Which college student can refuse?
Do what you say, no ambiguity.

In the mechanical manufacturing laboratory, Zhuang Qianding, a professor, immediately got busy and began to formulate detailed steps, while Yu Hua was in charge of the secondary work.

Although Yu Hua was unable to carry out high-intensity thinking activities and calculation work, there was no problem in assisting Zhuang Qianding to get started, and it was easy.

In addition, since there is only so little time for efficient study every day, the time for academic research will be further shortened due to the increase in consumption. Now that an agreement has been signed for the technology replacement plan, Yu Hua has more or less spare time, which can be squeezed out.

The processing of barrel blanks, in the small, is a struggle, and in the larger, it is to explore and create a new barrel processing technology.

Process and manufacture gun barrels without a drill press and deep hole gun drill!
(End of this chapter)