Chapter 77

However, the middle-aged man's surprise didn't last long, and was soon replaced by lingering sadness, because the problem he encountered was not solved by metal felt and vacuum brazing. If it could be so simple, he would not have to go all the way to Xingzhou city.

Now, they think that the successful factory underestimates the difficulty of the model. They thought it was just an improved model of the J-7. In the past decade, the successful factory has done a lot of minor repairs and minor repairs. There are no big changes in the overall material and manufacturing process. Just take the drawings and add or subtract something according to the specifications.

This time, however, it's not the same. A third is added to the back of the J-7. It's just like the U.S. military equipment has been replaced on the tuba road. The J-7 is still the same as the J-7, but its structure, overall anti fatigue level, and internal technology have all undergone earth shaking changes.

At the beginning, the successful factory didn't take it seriously until the technicians came to the design institute. They didn't know that what was waiting for them was a new monster dressed in J-7 skin.

As for what follow-up design is, it's very simple that the aircraft manufacturer sends technicians for trial production to the aircraft design unit to track the design process, understand the design intention, put forward suggestions on the process problems encountered in the design, and make good preparation for the manufacturing process.

It is reasonable to say that we have the right to put forward difficulties in the manufacturing process to the design unit, and sometimes the opinions of the manufacturer are still very important. After all, no matter how good the design unit's products are, it is useless if they can't be made.

However, the opinions of the technicians of the successful factory were directly ignored this time. The reason is very simple. The J-7 III is a new model imitated by the Soviet MIG 21mf. Since it is imitated, it must be made in a decent way. There may be difficulties, but they must be solved!

Chenggong factory, which was fiercely criticized by the superior, had no choice but to go back with the drawings. As a result, the more you look at them, the more numb your scalp becomes. Many things have never been done in the factory. How can you do this job.

However, knowing that he had fallen into a big hole, the success factory had to stick to it. There was no way. The task of the superior was dead. If he didn't do it, he had to do it, or he would have no food to eat.

As a result, although the successful factory knew that it was not easy, it was still on the trial production task of J-7 III. as a result, it didn't know that it was not easy to do it. It was only after doing it that it found that it was more difficult than expected. It was exaggerating to say that it was difficult, but one step at a time.

Take the third workshop of Chenggong factory, where the middle-aged people live, as an example. Several important parts need to be precisely processed by them. However, the previous experience and technology of the third workshop are useless. As a result, the progress of trial production is extremely slow. Even if it is made, it may face the risk of unqualified quality.

The middle-aged people feel distressed when they think about the parts that are judged as waste products. They can't help looking up at Tang Lili.

Since the Xingzhou Aircraft Design Institute sent this woman, the nightmare of their workshop began, but there was no way. Who let them be the designers of the design unit.

Many production links of aircraft manufacturers need to communicate with designers face to face, so as to deal with problems in the first time, such as fuselage structure, wing, landing gear, hydraulic system, cockpit cover, etc. from trial production of parts to final assembly and flight test of the whole machine, all kinds of problems are fed back to the design, and the designers will modify them again and again to make the design more perfect.

Tang Lili is engaged in aircraft structural strength. Because of the slow preparation of the 10th project, she was temporarily transferred to the J-7 III project team as a designer to accumulate design experience.

Now that she has been sent to the first-line factory, and saw that the parts of the plane that used to be only on the drawings have turned into three-dimensional objects, Tang Lili sincerely feels that her trip is worthwhile, and she is engaged in structure, so Tang Lili naturally wants to play her best.

So she uses her own professional to analyze the structural strength and safety of each part of the aircraft, and establishes a mechanical model based on it, so as to further analyze the load, stress and strain, find out the physical meaning, the stress state of the structure, and the way of force transmission, and then solve it through the mathematical model.

Then Tang Lili has the theoretical sword of relying on heaven and the sword of killing the dragon. She can kill all the people in the third workshop of Chenggong factory.

The technicians and teachers in the workshop agreed on which one was slightly deviated and which one was twice thinner, but Tang Lili was not compatible.

For this reason, the director of the technology room of the third workshop specially asked her to say something. Tang Lili didn't talk nonsense either. She piled the half human high mathematical model in front of the director of the technology room of the third workshop. The director of the technology room of the third workshop was speechless and had to hide her face.

After that, Tang Lili killed people in the third workshop, and Buddha killed Buddha. She said that 3214 parts would not work, and 3214 parts would be invalid. She said that 1786 frames were not standardized, and 1786 frames had to be recycled as non-metallic.

No matter 3214 parts or 1786 frames, they are all big doors with trial production costs as high as hundreds of thousands. In a word, they are destroyed. It's not too much to say.

As the workshop director of the third workshop, the middle-aged people, even though they know that design and manufacturing are contradictory, and design stresses perfection, while manufacturing pursues to reduce costs and improve efficiency. However, like Tang Lili, they can't afford to be destroyed by hundreds of thousands of people, no matter how thick the foundation of their workshop is.

As a result, they began to upgrade their technology. Instead of destroying the expensive open door parts, they had better take out the money to improve their own level. Since the existing equipment and technology can not effectively complete the trial production of J-7 Ⅲ, we should learn new technology and introduce new equipment to meet the trial production requirements of J-7 Ⅲ.In this way, the successful factory took the opportunity of trial production of J-7 Ⅲ to start its own technological upgrading road. However, this road did not go smoothly. After all, many technologies and equipment are still blank in China. If you want to improve them, you can only import them. However, it is embarrassing that you can't buy some key equipment and technology even if you have money, because foreign countries don't sell you at all.

For example, the shot peening technology that worried him the most about as the director of the third workshop contacted Boeing company in the United States earlier and wanted to introduce two sets of spray finishing machines from them. Boeing company was polite to show them around and then said, "our equipment is self-developed. Because of their uniqueness and uniqueness, we can't sell it, but You can look at our other products, such as the latest Boeing 737... "

It's very polite, but the main idea is that you can see it, but we don't sell it!

If you can't buy it, you have to do it by yourself. The problem is whether you have experience and technology, and you can't do it for a moment. Just when the director of the third workshop is in a mess, Tang Lili suddenly finds him and says that someone in Yonghong factory where her lover lives has developed the relevant technology of shot peening machine.

As soon as the director of the third workshop listened, he was shocked. Don't say anything. Let's see first!