Li Shan is still in his apprenticeship, so he is not qualified to sign.

The finishing work was finally over, and the engine was transferred to the transport truck to prepare for storage, and I don't know who hung a piece of red ribbon on it, and pulled up a banner above it, which read, "Warm congratulations on the delivery of the first machine", and the factory leaders who are usually rare in the factory also arrived. Since the start of construction, the military representatives who have been following the scene have not left an inch, and many people have come, and all kinds of signs show that the top has attached great importance to this engine.

The delivery ceremony was carried out very briefly, and the content was nothing more than a speech by the factory leader, a speech by a military representative or something.

Li Shan looked at all this, and his mood at the moment was still quite good, this was the first engine he had assembled by himself, and he was still a little proud in his heart when he imagined it flying in the blue sky.

Since the last time he met Han Xin, Li Shan has dated her a few more times, and the two get along relatively well, Li Shan's dress and mental state are obviously different from before. Naturally, these changes in him could not escape Lin Jianping's eyes, and this old Jianghu teased Li Shan: "It is obvious that there is adultery, and he is not honest." ”

Li Shan, who was immersed in warmth, did not get carried away, he never forgot his promise, hoping to bring happiness to the girl.

Li Shan's work has become more active, and he has really worked assembly technology, and when he is fine, he will look at the process specifications, and as long as there is something he doesn't understand, he will run to ask the masters of the section. The teachers also recognized Li Shan's attitude very much, and said with emotion: "There are not many young people who are so attentive to learning technology now. Most of them will give Li Shan guidance without reservation. This made Li Shan progress very fast and basically grasped the key points of assembly work.

Li Shan himself believes that the key point of assembly is to lift weights lightly, which requires certain skills and brains. The reason why Swiss watches are famous all over the world is not unrelated to the level of manufacture, but more importantly it depends on the assembly skills of Swiss watchmakers.

Through observation, it is found that the key point of aircraft engine assembly lies in the adjustment and installation of the turbine rotor, and the turbine rotor is one of the important components in the engine, which can expand the air at high temperature and high pressure, and part of it drives other parts of the engine to work, and the other part is sprayed backward to make the aircraft produce thrust, so the quality of the assembly of turbine parts is directly related to the assembly quality of the engine. This is also a bottleneck in the assembly of the entire engine, as long as you master the assembly know-how of the turbine rotor, the rest will be solved.

The turbine rotor structure of Huashan engine is relatively special, and the device design of the device connected with other components is very ingenious, and the technical difficulty requirements for assembly are relatively high. The rotor is installed inside the engine, and the connection with other components can not be seen or touched, and it is completely ensured by a set of auxiliary tools, which requires the operator to have a high technical level, which is generally completed by a person with a senior worker certificate in the section.

Li Shan pondered the working principle of this set of tools, compared the design drawings, and repeatedly studied the parts, and finally one day he suddenly opened up. It's just that what Li Shan didn't expect was that the opportunity to show his face for the first time since entering the factory would come so soon.

On this day, the rotor assembled by technician Liu Changhui was really a bit evil, and the height was much less than the normal size after installation, and he couldn't install it in place, so he was so anxious that he sweated.

It's been two days of tossing back and forth like this, and the foreman also went into battle in person when he saw this, and he fiddled a few times, but he also couldn't settle it.

In desperation, the foreman had no choice but to say: "Take out this rotor first, and see the situation inside first." At this time, something strange happened, the rotor was like something was pulling inside the engine, and it couldn't be taken out.

Now it's good, this turbine rotor can't be loaded, and it can't be taken out, and the foreman's head is also bigger, so he completely surrendered his gun, so he had to helplessly say to Huang Jiang: "Please ask the technician to take a look." ”

Jiang Xingkun is the technician in charge of the assembly section, and after receiving the call, he came to the scene for a long time. I saw that he frowned, and seemed to be more sad than others, and he also looked helpless.

"Go and invite you Lord Han. The foreman said impatiently.

After a while, the technical director Han Yijun was also invited. The man was in his sixties, and he appeared shrewd and capable, with the confidence characteristic of an intellectual. He has participated in the development of many major national projects, and is also a well-known figure in the industry.

He turned out to be the old director of the workshop technology room, and he had already retired, but because of the needs of the work, the workshop rehired him as a technical consultant.

After he came to the scene, he immediately instructed Jiang Xingkun to bring the design drawings over, and said to him: "If we are engaged in technical work, we must look at the drawings more, so that we can have a target." ”

Jiang Xingkun hurriedly agreed.

Director Han looked at the design drawings and asked Engineer Liu without raising his head: "Do you lift up along the axis when you use the tools?"

"Yes. Engineer Liu nodded and replied.

"And how much have you improved?"

"About four or five centimeters. "Engineer Liu is a little unsure.

"Don't say probably, what I need is accurate data. You have to know that an aircraft engine is a precision part, and sometimes the tolerance is only a few tenths of a millimeter. Han Yijun's tone was unquestionable, "Now you guys give me a new operation, I'll take a look." With that, he walked up to the assembly rack.

Engineer Liu hurriedly persuaded: "Han Gong, this ladder is so narrow, your legs and feet are inconvenient, just command below." ”

"I'll have to watch it myself, I'm not worried about you guys doing your work. Director Han waved his hand and began to climb up the ladder.

Foreman Liu motioned to Lin Jianping to take a handle on the side, after all, this shelf is also more than two meters high, and the ladders on both sides are a little oily, very slippery, they are already retired people, don't drop the old man.

After Director Han got on the assembly frame, he instructed the technician Liu Changhui: "You put a measuring table on the end face of the tool. ”

"It's already been put away. ”

"I put the index of the table to the zero position. ”

"That's right. ”

"Okay, little ginger, you get the pen and paper ready, now lift the tools up. ”

"It's already mentioned. ”

"Xiao Jiang, have you written down the data on the table, how much?"

"4.22 cm. ”

"You turn the tool 90 degrees clockwise, yes, that's it. Xiao Jiang, you can see if the data in the table has changed. ”

"4.21 centimeters. ”

"Well, just now I calculated it through the size chain, and under normal circumstances, this data should be 5.21 cm, which means that there is no size of 1 cm, so what is the problem?" Director Han's words are like asking everyone, and also like asking himself, his eyes are fixed on a certain place, and obviously the focal length is not there.

Engineer Liu said: "Director Han, why don't we go down and discuss." ”

"Well, okay. Director Han looked at the engine again, and his tone looked a little helpless.

As soon as he stepped off the assembly frame, Minister Chen of the production headquarters led a few people to the scene, he came almost every day in the past few days, after all, the assembly work has not made much progress, and has attracted the attention of the relevant leaders above.

Minister Chen stepped forward to hold Director Han's hand and spoke: "Director Han, you are still going into battle in person, be careful of your body bones." ”

"It's okay, I work out a lot, and it's not a problem to get on and off the rack. Director Han said disapprerovingly.

"Look, what's the problem?"

"According to my estimate, the parts may have been bumped during the assembly process, and the surface of the parts was somewhat deformed. Director Han pointed to the assembly frame with his finger and continued carefully: "In addition, the assembly tools are often worn out during use, which is easy to produce burrs, and these burrs squeeze the gap between the tool and the connecting shaft, and the free movement gap between the two is gone, thus hindering the displacement of the turbine rotor along the axial direction, resulting in the current dilemma of the rotor. ”