However, the middle-aged man's surprise did not last long, and was soon replaced by a lingering sadness, because the problem he encountered was not solved by metal felt and vacuum brazing, if it was so simple, he would not have to run all the way to Sin Chew City.

Now that I think about it, their successful factory still underestimated the difficulty of the model, I thought it was just an improved version of the J-7, and the successful factory has done a lot in the past ten years, basically it is a small repair and small improvement, and there is no major change in the overall materials and manufacturing process.

However, this time it is different, J-7 has added a III to the back, just like Tubalu has been replaced with American equipment, the whole shotgun has been replaced, and J-7 is still the appearance of J-7, but the structure inside, the overall fatigue resistance, and the process inside have all undergone earth-shaking changes.

At first, the successful factory didn't take it seriously, and it wasn't until the technicians who followed it came to the design institute that they knew that what was waiting for them was a new monster dressed in the skin of the J-7.

As for what the follow-up is, it is very simple, that is, the technical personnel of the aircraft factory will go to the aircraft design unit to track the design process, understand the design intent, make suggestions on the process problems encountered in the design, and make process preparations in the manufacturing process.

It stands to reason that there are difficulties in the manufacturing process that have the right to raise them to the design unit, and at some point the opinion of the manufacturer is still very important, after all, no matter how good the design unit's things are, it is useless to make them.

But the opinions of the technicians of the successful factory set up this time were directly ignored, the reason is very simple, the J-7III is a new model imitated according to the Soviet MiG-21MF, since it is an imitation, it must be made decently, difficulties can be had, but must be solved!

The successful factory that was ruthlessly scolded by the superiors had no choice but to go back with the drawings, but the more I looked at it, the more my scalp began to numb, and many things had not been done in the factory, so how to do this job.

However, knowing that he fell into a big pit, the successful factory still has to bite the bullet, there is no way, the task of the superior is dead, and if you don't do it, you have to do it, otherwise you will have nothing to eat.

So the success of the factory although it is not easy, or on the J-7III trial production task, the result does not know, only to do a job only to find that the difficulty is greater than imagined, said that it is difficult to say that it is a bit exaggerated, but one step at a time is not an exaggeration.

Take the third workshop of the successful factory where the middle-aged man is located, several important components need them to do precision machining, and the previous experience and technology of the third workshop are useless, and the result of pushing to the beginning is that the progress of trial production is extremely slow, not to mention, even if it is made, it may face the risk of unqualified quality.

Thinking of the parts that were judged to be scrap, the middle-aged man felt a little distressed, and couldn't help but raise his eyes to look at Tang Lili opposite.

Since the Sin Chew Aircraft Design Institute sent this woman over, the nightmare in their workshop began, but there is no way, who makes the family a designer of the design unit.

Many production links of aircraft factories need to communicate with designers face-to-face, so as to deal with problems in the first time, fuselage structure, wings, landing gear, hydraulic system, cockpit canopy, etc., from the trial production of parts to the final assembly of the whole aircraft, test flight, all kinds of problems are fed back to the design, and the designers will modify it again and again, so that the design is improving day by day.

Tang Lili was engaged in the structural strength of the aircraft, because the preparation of the No. 10 project was slow, so she was temporarily transferred to the J-7III project team as a designer in order to accumulate design experience.

Since she was sent to the first-line factory and saw that the aircraft parts that were only on the drawings in the past have become three-dimensional objects, Tang Lili sincerely feels that this trip is worthwhile, and she is engaged in structure, Tang Lili naturally wants to play to the extreme.

Therefore, she used her professional analysis of the structural strength and safety of each component of the aircraft, and established a mechanical model based on this, so as to further do load, stress-strain analysis, find out the physical meaning, the force state of the structure, and the force transmission mode, and then solve it through the mathematical model.

Then Tang Lili had the theoretical Yitian Sword and Dragon Slaying Knife, and even in the third workshop of the Chenggong Factory, she killed all sides.

Which empty is slightly off, and which joint has two thinner thicknesses, the craftsmen and masters in the workshop have recognized it, but Tang Lili is not accommodating.

For this reason, the director of the craft room of the third workshop specially asked her for an explanation, and Tang Lili did not talk nonsense, and piled up the half-human-high mathematical model in front of the director of the craft room of the third workshop, and the director of the craft room of the third workshop was immediately speechless, so he could only hide his face and leave.

After Tang Lili in the third workshop is even more people block killing, Buddha block killing Buddha, she said that 3214 parts are not good, 3214 parts will be invalid; she said that the 1786 frame is not standardized, 1786 frame has to be returned to the furnace according to non-metal.

Whether it is the 3214 part or the 1786 frame, it is a big opening with a trial production cost of hundreds of thousands, and it will be ruined in one sentence, and it is not an exaggeration to say that it is a golden mouth.

As the workshop director of the third workshop, even if the middle-aged man knows that design and manufacturing are contradictions, the design is perfect, and the pursuit of manufacturing is to reduce costs and improve efficiency, but like Tang Lili, hundreds of thousands of dollars will be destroyed at every turn, and no matter how thick the foundation of their workshop is, they can't withstand such consumption.

So he gritted his teeth and began to upgrade his technology, rather than destroying the costly parts of the large door in vain, it is better to take out the money to improve his own level. Since the existing equipment and technology cannot effectively complete the trial production of the J-7III, it is necessary to learn new technologies and introduce new equipment to meet the trial production requirements of the J-7III.

In this way, the successful factory took the opportunity of the trial production of J-7III to start its own road of technological upgrading, but this road is not smooth, after all, many technologies and equipment are still blank in China, and they can only be solved by imports, but the embarrassing thing is that some key equipment and technology you can't buy even if you have money, because foreign countries don't sell you at all.

For example, the shot peening technology that worries him the most about the director of the third workshop is that he contacted the Boeing Company of the United States earlier and wanted to introduce two sets of spraying machines from them, and the Boeing Company was polite, and after leading them to visit a circle, he said: "Our equipment is self-developed, between their uniqueness and uniqueness, we can't sell it, but you can take a look at our other products, such as the latest Boeing 737 ......"

The words are very polite, but the central idea is just one sentence, you can watch, but we don't sell!

If you can't buy it, you have to do it yourself, the problem is whether you have experience and technology, you can't do it for a while, just when the director of the third workshop was anxious, Tang Lili suddenly found him, saying that someone in the Yonghong factory where her lover was engaged in the relevant technology of the shot peening machine.

The director of the third workshop was shocked when he heard it, don't say anything, see you first!