my scientific age

In the Liushugou Machinery Factory, the hustle and bustle of the headquarters' spy regiment, and the news that the [-]mm mortar project was finalized and mass-produced, did not affect it.

On the table of GROB's high-precision lathe, a metal rod with a diameter of about 400 mm, made of gray cast iron, is fixed.

The structure of the turbo compressor is different from that of the conventional compressor. The internal structure is similar to that of a motor. It consists of a rotor and a stator. The rotor is divided into two parts, the main shaft and the impeller, and the stator belongs to the fuselage. The most difficult part is the main shaft. with impeller.

Although the mechanical properties of gray cast iron are not comparable to that of electric furnace steel, it can still meet the mechanical requirements of the compressor rotor main shaft.

"A total of three spindles need to be machined, and each spindle is processed using the active machining method, which is often used by everyone to measure while machining, first rough and then fine, the efficiency can be slower, but try not to make mistakes, once the car is scrapped, it will not only waste The material will cause economic losses and will delay the delivery time. You must complete the processing of the spindle before August [-]." Before the start of processing, Zhuang Qianding stared at the five members of the lathe team and solemnly explained the situation: "You are solely responsible for the spindle processing. , I hope everyone is mentally prepared."

Zhuang Qianding chose to hand over the machining task of the main shaft to a group of five who had just mastered the basic operation skills after short-term training, while he had to go to the milling workshop next door to process the impeller with the highest technical requirements.

In a special period, special treatment is required. If it is changed to a normal situation, tasks such as processing the main shaft of important equipment are generally carried out by the most skilled senior lathes in foreign machinery manufacturing plants. Apprentice lathes can only do some work The matter of serving tea and water.

Turners like the Huan Five who have only touched the lathe for a day are not even apprentices, and it is absolutely impossible for them to be responsible.

However, the matter is so mysterious, Zhuang Qianding can only choose to hand over the machining of the spindle to five people in the lathe team.

Hearing the news from Zhuang Qianding, the five members of the lathe team looked at each other with solemn expressions in their eyes. On August [-]th, that is to say, there are still fourteen days left.

To complete the machining of three spindles within fourteen days, this is definitely a big challenge for them who have just mastered the basic skills.

But they have no choice.

"In addition, regarding the disposal of unqualified gun barrels, I went to the headquarters yesterday. After negotiating with Director Chen Kang, I finally agreed to deal with the method proposed by Comrade Hu. Now you can process the gun barrels with confidence and boldness. The blanks." After Zhuang Qianding announced the task of the rotor spindle, he changed the conversation and mentioned the disposal method of the waste barrels: "I believe you must be thinking, why I am so strict, only 0.1 mm beyond the tolerance range, a piece of After manual forging, rough rolling, finishing rolling, annealing, pickling, and final finishing, the barrel must be classified as a non-conforming product, who wants to understand?"

"Sir, we all want to understand that the actual inner diameter of some of the mortars we built before is greater than 1 mm, and the shells can be shot even if they are put in. Why not this time?" Hearing Zhuang Qianding's words, the five people He was stunned for a while, then looked at each other briefly, and then asked questions by Juan, who had the highest grades and skills, with respectful and serious words.

Why, yes, they want to understand why it is so strict, you know, they used to make weapons and ammunition, don't say 0.1 mm, even if the accuracy error value reaches 0.5 mm, they can still be used as usual.

During the Guantian Arsenal period, many mortars suffered from barrel wear. After maintenance, the difference between the actual inner diameter of the barrel and the inner diameter on the paper was close to 1 mm, but the shells were still usable when they were inserted, and they were still able to fight white bandits.

Zhao Zhangcheng used the mortars they had repaired, and it was still successful, and was widely praised by the soldiers of the army.

But now it is only 0.1 mm beyond the tolerance, it will be classified as a non-conforming product.

I don't understand, really don't understand.

"This question is not essentially a question of whether the barrel can be used or not, but an attitude. Regarding the attitude towards tolerance standards, let me ask you, how does the current level of machinery manufacturing in the base area compare with that of foreign countries?" Zhuang Qianding smiled, his face Gentle and friendly, but not angry, he explained slowly.

"We don't know, but it's definitely better than others. People can build aircraft, cannons, tanks, and aircraft carriers and battleships that were taught in the anti-college school before. We can only build mortars now." When Juan heard the words, there was a trace of confusion in his eyes, and he shook his head and replied. road.

"If there are 10 manufacturing levels in total, the United States has 8, Japan has 7, the Soviet Union has 7.5, France has 9, and the United Kingdom and Germany have 10, and we can only be regarded as level 2 at best, belonging to manufacturing babies."

Zhuang Qianding nodded, gave a simple example to divide the level of manufacturing, and looked around everyone: "In my opinion, there are two factors that determine the level of manufacturing, one is based on technology and industrial-based hardware, and the other is based on standardization systems. The software and the two complement each other. The reason why the foreign manufacturing level is high is because they basically achieved a high degree of compatibility between software and hardware, a Mauser pistol made in the Republic of China, a Mauser pistol made in the United States, an original German pistol, three Which one would you choose?"

"It is definitely made in Germany. It is of high quality, stable and reliable, with little wear on the rifling and high precision." Juan replied without hesitation.

Just kidding, if you had to choose one of the three, of course it was made in Germany.

The other four were silent, and they seemed to have understood what Zhuang Qianding was going to say.

"Why is made in Germany so good, because they are very strict with the standardization system, one is one, the other is two, I stipulated that the tolerance cannot exceed 1 mm, then the tolerance of the parts you process reaches 1.1 mm is unqualified, there is no love. Word."

Zhuang Qianding nodded, and his face became a little serious: "Your manufacturing industry has just started, you must be strict with tolerance standards, if there is a little more here, a little more there, the mortar is really no big deal. , but what about more sophisticated weapons and equipment? It’s never a problem if you want to learn to run without learning to walk, but you have to ask yourself if you have that ability!”

"As a manufacturing baby, you must be down-to-earth and take one step at a time! Only in this way will you have the opportunity to qualify as a manufacturing powerhouse."

"Unless, you only ever want to make mortars."

The voice gradually became higher, revealing seriousness.

Don't learn to walk, just run, that's what a genius should do, and that's Yu Hua's part-time job.

The inner diameter of the gun barrel is 0.1 mm more and it can be used, but this is not a question of whether it is used or not, but a problem of the attitude of the manufacturing industry towards tolerance standards.

You can't turn a blind eye to the tolerance standard and violate it at will because of your heartache.

The five nodded silently.

"In short, I hope you understand the principle of the supremacy of tolerance standards, which is the soul of machinery manufacturing. Comrade Hu said that the situation of more than one millimeter after repair can only occur in other places, not Liushugou Machinery Factory. In essence, the Guantian Arsenal is a workshop, which is very different from your current situation." Zhuang Qianding said finally.

"Sir, what you said is very good!" At this moment, a strong and powerful voice suddenly came from behind. The person who came was the boss who came to inspect, followed by General Liu, Chen Kang and others.

"Hello, Chief!" The five members of the car crew immediately saluted.

"Hello, chief, why are you here?" Zhuang Qianding turned around, saw the boss and his group, nodded in greeting, somewhat surprised.

"I just came to see and inspect the arsenal. I didn't expect to hear such a heartfelt remark. What Mr. said is very right. Our manufacturing industry has just started, and we must strictly treat tolerance standards. We must not hold a similar mentality. If you have any questions, you must listen to your husband." The boss's face was full of solemnity. Although he was a layman in the manufacturing industry and did not understand metal processing, he knew what Zhuang Qianding was doing.

This is a teacher, preaching and deceiving, and sincerely planning for the future of the machinery manufacturing industry in the base area, creating the most important system.

"Yes!" Chen Kang in the team responded.

"Chief, I don't talk a lot, and I don't pay attention to authority. I will accept everyone's good suggestions." Zhuang Qianding shook his head and smiled and said, "If there is nothing else, I can't accompany you, there are still more today. A lot of machining tasks.”

"No, no, sir, you are busy first." The boss shook his head, his words full of respect, and then led the team to leave the turning workshop and go to the next place for inspection.

"Comrade Hu, let's start. I'll go to the milling workshop to process the impeller. If you have anything, just call me. Remember, you have 14 days left." said.

Say it, leave.

In the turning workshop, there were only five people left in Juan, and they fell into silence.

"Comrades, I just say one sentence, the tolerance standard must come first!" Juan took a deep breath, looked at his comrades around him, and said solemnly: "Our backward thinking in the past will change."

Everyone nodded solemnly, as if taking an oath in their hearts, imprinting the concept of the first tolerance standard in the deepest part of their hearts.

"Om!" After a while, the sound of GROB's lathe rang out in the workshop, and the metal collided with each other, playing a special piano song.

The machining of the first rotor spindle officially started. The five workers in the lathe team must process the cast spindle blank with a diameter of 400 mm and a length of 800 mm to a diameter of 340 mm, a dimensional tolerance of ±200 microns, and a surface roughness of 25 microns according to the design drawings. .

For the turn group who has never been exposed to precision machining before, this is definitely a super tough bone to crack.

When it comes to the finishing process, you can't go wrong with a single knife. If it is wrong, the rotor spindle blank, which has been painstakingly cast, will be declared scrapped.

It should be known that in order to obtain a high-quality rotor spindle blank, three blanks are often scrapped in the casting process, and the cost is not small.

……

Inside the milling shop next door.

The GROB semi-automatic gantry milling machine, which weighs several tons, has passed the commissioning, acceptance and final inspection again and again, and has obtained the approval qualification to start production. Zhuang Qianding leads a group of five milling workers who have not yet passed the milling theory examination to carry out the rotor impeller machining task. preparatory work.

The core of the rotor impeller consists of an impeller disk, main blades and splitter blades. The two-stage nine-blade design requires a total of two impeller disks and eighteen metal blades.

The intake unit, the compressor unit, and the expansion unit, a total of three units need rotor impellers. Zhuang Qianding has processed at least six impeller discs and 54 pieces before August 10th. Considering possible damage and accidental factors in assembly, the final quantity It must be increased by more than [-]% as a safety redundancy.

Fortunately, due to the casting impeller process, the impeller disk and blades only need to be finely milled once. In order to ensure mechanical properties and strength, the impeller disk is made of gray cast iron, and the main blade is made of electric furnace steel.

The semi-automatic gantry milling was replaced with a T-slot milling cutter made of high-speed steel. Two young apprentice millers lifted the iron impeller, which was cast by the iron factory, weighing more than [-] kilograms, and placed it on the surface of the worktable for benchmarking. positioning and fixing.

As one of the advanced metal processing skills, milling is not as easy to learn as lathes, with high threshold and complicated operation. There are very few people who know milling in the base area, and there are no workers who are proficient in milling technology.

The five members of the milling group are basically learning from scratch. Except for some manual work and chores, they can't help Zhuang Qianding for the time being.