my scientific age

Chapter 233 Peking Paper Is Expensive!

"Yes, there is only one last step left."

When Zhuang Qianding heard it, he smiled and said, "Yusheng, go and get me a barrel blank."

Yu Hua nodded and turned to get the gun barrel blank. Here, Zhuang Qianding took the deep hole gun drill to the front of the lathe, put it in the three-jaw chuck and fixed it firmly, and then adjusted the coolant and lubricating fluid nozzles to a reasonable level. Location.

This processing is different from the past. Because the hardness of the deep hole gun drill is exactly the same as the hardness of the barrel blank, the drilling operation must be cautious and subtle, the feed speed should not be too fast, and the work should be done slowly.

Generally speaking, the hardness of the tool must be at least one times greater than the hardness of the workpiece in order to achieve cutting, and four times or more is the best, but this does not mean that the hardness of the tool and the workpiece cannot be processed. The most common situation is that the deep hole gun drill is worn It will be very big.

The wear of the drill bit and the inability to process it before are completely two concepts.

After a few minutes, the preparations before the barrel processing are all over, and the barrel blank is fixed in position.

Zhuang Qianding started the lathe, the deep hole gun drill above the spindle rotates at a low speed, and the barrel blanks placed on the tool rest and tailstock are fed steadily.

"Zi!" When the drill bit and the billet were in slight contact, a sharp friction sound came out. In an instant, a circle of metal chips reappeared and fell on the worktable. Improve lubricity.

Yu Hua stood aside and carefully observed the condition of the workpiece and drill.

Because Zhuang Qianding's movements are very delicate and the feed rate is well controlled, there is no processing accident, the deep hole drill is stably fed, and circles of metal chips emerge from the drilling holes.

two centimeters.

five centimeters.

eight centimeters.

The machine tool coolant nozzle is adjusted to the maximum pressure state, and it continues to impact the contact surface like high-pressure water droplets, reducing the temperature and bringing out the metal chips.

High temperature and difficulty in chip removal are the most serious problems in the field of deep hole machining. The advantage of deep hole gun drilling is that the coolant nozzle can enter the hole for cooling, so as to avoid damage to the workpiece and drill bit due to excessive temperature.

The whole drilling process is slow and strict. As the hole depth reaches more than [-] cm, Zhuang Qianding directly adjusts the spindle speed to the lowest gear.

Not fast, but stability.

Time passed by minute by minute. When the depth of the hole reached [-] centimeters, Zhuang Qianding stopped the lathe, stopped drilling, and then reversed the direction of the barrel blank, and the other end that had not been drilled faced the deep hole gun drill.

Because the length of the deep hole gun drill is not enough, Zhuang Qianding can only use this method of secondary drilling. The disadvantage is that if there is an error, the entire gun barrel blank is basically scrapped.

"The length of the deep-hole gun drill should be about 1 meter. In this way, a [-]-centimeter long barrel can be drilled and formed at one time, thereby avoiding secondary drilling." Yu Hua carefully observed the drilling process and put the currently exposed The processing problems are recorded in the mind and pondered silently.

The deep hole gun drill is not long enough, which is a problem.

In addition, the hardness of the gun drill material is not enough, which is also a problem.

Coming up with ideas, conducting experiments, documenting flaws, and finding solutions is the process of scientific research.

The barrel processing continues, thanks to Professor Zhuang Qianding's extremely good craftsmanship, and the secondary drilling accuracy is extremely high. It didn't take long for the last [-] cm of the entire barrel blank to block breakthrough, and the tolerance of the same axis was extremely small. Gun holes appear.

After the gun hole was drilled, Professor Zhuang Qianding motioned to Yu Hua to record the steps and precautions of the entire operation process, while he measured the drilling accuracy with the tool, and after obtaining the parameters, he was relieved.

The most important step is the successful drilling of the gun hole.

Yu Hua carefully recorded the barrel processing steps and related data, and measured the deep hole gun drill. The wear was relatively large, but it was within a controllable range.

After the recording was completed, Zhuang Qianding immediately replaced the reamer, reamed the gun hole, and carried out the final finishing.

The final, reamed barrel stock has a straight and smooth 7.92mm bore.

"Sure enough, it was a success. Although it was time-consuming and labor-intensive, it was much better than not being able to process it."

Zhuang Qianding held the 7.92mm barrel, which was as smooth as a work of art inside and out, with both hands. He took a detailed look, admired it carefully, and expressed admiration. Recalling the scene of suffocation at the beginning, he couldn't help but say: "If I had thought of this way earlier, I would have Nor will they be helpless in the face of these blanks.”

This 7.92 mm caliber barrel is assembled with the most advanced infantry standard weapon in China at present - the official rifle.

"Professor Zhuang, this is the problem exposed by this method. The hardness and length of the drill bit need to be solved." Yu Hua nodded, then handed over the laboratory notebook and said to Zhuang Qianding.

"This is not a problem of methods, but a problem of our weak industrial strength. For a long time, the Chinese steel industry has not been able to smelt gun steel. The barrels of the Hanyang-made rifles produced by the Hanyang Arsenal and the medium-sized rifles produced by the Gongxian Arsenal have their barrel blanks. All purchased abroad." Zhuang Qianding put down the barrel, took the notebook to check, nodded affirmatively, and said.

"Do we need rifling?" Yu Hua nodded silently when he heard the words. What Zhuang Qianding said was basically true, and this was the core reason why he had to master the oxygen blowing furnace and electroslag remelting technology.

If you want to make guns and cannons, you have to make materials first.

There is no barrel stock and barrel stock that meets the performance, so make a hammer gun.

"Rifling processing is not in a hurry for the time being. There is no broach in the laboratory. I am not familiar with this. I will make all the barrels and send them to the Gongxian Arsenal."

Zhuang Qianding shook his head and replied: "This method is adapted to local conditions, and the processing efficiency is not low. Without vertical drilling, a single lathe can drill at least 10 barrel blanks per day. I will follow this method. Write three related papers, all of which you sign as a second author."

"Student, thank you professor." Yu Hua was stunned when he heard this. He didn't say no to refuse, but bowed his thanks.

I am a person with true disposition, and I don't have to do anything else, but the second author of the three papers has to.

This is simply a waste of money, don't be a pure idiot.

The second work is just right for Yu Hua's current identity.

"However, you still have to take elective courses in the future, and don't give me a blank paper during the exam."

Zhuang Qianding smiled and joked: "Also, you don't have to hand in your homework. Today's processing method is the best homework for me."

"Students certainly won't." Yu Hua shook his head, how could he not go to class, although his understanding of mechanical engineering has gradually deepened, it is far from being a teacher.

Only with a high enough level of mechanical engineering can Yu Hua be able to engage in the research on oxygen-blown furnaces, and it is not yet ready for the heat.

Looking at the humble and polite Yu Hua, Zhuang Qianding shook his head and smiled and said, "Okay, that's all for now. You go back to rest first, and I will also go back to rest."

……

The experience of processing gun barrels in the machinery hall is unknown to outsiders. Yu Hua lives as calmly as ever. He studies discrete logarithms every day, and writes encryption algorithms and algorithm password tables. The progress is constantly improving, and it will be completed soon.

In mid-June, on this day, a major event happened in Beiping City, that is, Xinhua News Agency published a medical book called "Barefoot Doctor's Handbook", authored by Zhang San, at three yuan per book, with a total of 260 million words.

Once the Barefoot Doctor's Manual was released, it immediately caused a sensation inside and outside Peiping. Anyone who is eager for medical resources needs this medical masterpiece like a Confucian classic.

There is no way, the medical knowledge in the barefoot doctor's manual is really important. Although Yu Hua deleted a lot of drugs and diseases that were not in line with this era, such as penicillin, antibiotics, insulin, family planning, etc., there are still very many medicines and diseases. Treatment and diagnosis of many diseases.

For ordinary people, this is a precious medical resource book. In times of crisis, the above knowledge can be used to save the lives of family members.

For doctors and medical-related practitioners, this is simply a medical masterpiece at the level of the Analects of Confucius, which can become a teaching material and improve their medical skills.

It contains not only traditional Chinese medicine and various prescriptions, but also western medicine and treatment methods. The content is as high as 260 million words, which can make people read it all at once, and the gold content is simply not too high.

Best of all, the book sells for only three yuan.

sensation!

After the release of The Barefoot Doctor, it caused an unprecedented sensation.

In a very short period of time, the name Zhang Sanhe The Barefoot Doctor's Manual was introduced to the ears of hundreds of thousands of people in Peiping, and the first batch of [-] barefoot doctor's manuals published by Xinhua News Agency were sold out.

Peking paper is expensive!

PS: I updated 28 today, and I’m a little tired. This chapter is specially updated on the 29th. There will be no updates during the day and night. Basically, I have to wait for the [-]th. I’m too tired, so I’m really sorry.

(End of this chapter)