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Chapter 77 J-7III

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    However, the middle-aged man's surprise did not last long, and was soon replaced by a lingering sadness, because the problem he encountered could not be solved by metal felt and vacuum brazing. If it could be that simple, he wouldn't have to worry about it.  He ran all the way to Xingzhou City.

    Now that I think about it, Chenggong Factory still underestimated the difficulty of the model. I originally thought it was just an improved version of the J-7. In the past ten years, Chenggong Factory has made a lot of them. Basically, they were minor repairs and improvements. The overall materials used and  There are no major changes in the manufacturing process. Just take the drawings and add or subtract something according to the specifications.

    However, this time it is different. A 3 is added to the end of the J-7, which is like replacing the Tubal road with beautiful weapons and equipment. The entire shotgun is replaced by a cannon. The J-7 still looks like the same J-7, but its internal structure, overall fatigue resistance,  The craftsmanship inside has undergone earth-shaking changes.

    At first, Chenggong Factory was so careless that it didn¡¯t take it seriously. It wasn¡¯t until the technicians came to the design office that they realized that what was waiting for them was a new monster wearing the skin of the J-7.

    As for what follow-up design is, it is very simple. It means that technicians from the aircraft manufacturer go to the aircraft design unit to track the design process, understand the design intent, make suggestions on process problems encountered in the design, and make process preparations in the manufacturing process.  .

    Logically speaking, if there are difficulties in the manufacturing process, you have the right to report it to the design unit, and at some point, the manufacturer's opinions are still important. After all, no matter how good the design unit is, it is useless if it cannot be manufactured.

    But this time, the opinions of the technical staff of the successful factory were ignored. The reason is very simple. The J-73 is a new model imitated from the Soviet MiG 21mf. Since it is an imitation, it must be made in a decent manner.  , there may be difficulties, but they must be solved!

    Chenggong Factory, who was severely criticized by his superiors, had no choice but to go back with the drawings. As a result, the more he looked at it, the more his scalp began to tingle. Many things had not been done in the factory, so how could he do this work.

    "However, even though we know that we have fallen into a big pit, we still have to bite the bullet and get on with it. We have no choice but to do it. The superior's task is fatal. If you don't do it, you have to do it, otherwise you will have no food.

    So even though Chenggong Factory knew it was not easy, it still took on the trial production task of J-73. It turned out that it was more difficult than expected until it started. It is an exaggeration to say that it is difficult, but it is never an exaggeration to say that every step is bumpy.

    Take the third workshop of the Chenggong Factory where the middle-aged man works as an example. Several important components require precision machining by them, and the previous experience and technology of the third workshop are of no use at all. The result of having to start over is the progress of trial production.  Not to mention it is extremely slow, even if it is made, it may face the risk of substandard quality.

    The middle-aged man felt a little distressed when he thought about those parts and components that were judged to be scrap. He couldn't help but look up at Tang Lili opposite.

    ¡° Ever since Sin Chew Aircraft Design Institute sent this woman over, the nightmare in their workshop began, but there was nothing they could do about it, who was the designer of the design unit?

    Many production links in aircraft manufacturers require face-to-face communication with designers in order to deal with problems immediately, including fuselage structure, wings, landing gear, hydraulic systems, canopies, etc., from component trial production to complete aircraft assembly and test flight.  Various problems are fed back to the design, and the designers will make modifications again and again to improve the design day by day.

    Tang Lili is engaged in aircraft structural strength. Due to the slow preparation of Project 10, she was temporarily transferred to the J-73 project team as a designer in order to accumulate design experience.

    Now that she was sent to the first-line factory, she saw that the aircraft parts that were only on the drawings in the past had turned into three-dimensional objects. Tang Lili sincerely felt that her trip was worthwhile. And since she was engaged in structure, Tang Lili naturally had to give full play to her skills.  Extreme.

    So she used her expertise to analyze the structural strength and safety of each component of the aircraft, and established a mechanical model to further analyze the load, stress and strain, and find out the physical meaning, the stress state of the structure, and the force transmission method.  Then solve it through mathematical model.

    Then Tang Lili had the theoretical Yitian Sword and Dragon Slaying Sword, and soon she was killing everyone in the third workshop of Chenggong Factory.

    Which hole was drilled slightly off and which joint lug was two steps thinner? The craftsmen and master craftsmen in the workshop all recognized it, but Tang Lili was not accommodating.

    For this reason, the director of the craft room of the third workshop came to her specifically to ask for an explanation. Tang Lili didn't waste any words and piled half a person's height mathematical models in front of the director of the craft room of the third workshop. The director of the craft room of the third workshop was immediately speechless and could only hide his face.  And go.

    After that, Tang Lili was even more aggressive in the third workshop. She said that the 3214 parts were not good, and they would be scrapped; she said that the 1786 frame was not standardized, and the 1786 frame had to be remanufactured as non-metallic.

    Whether it is 3214 parts or 1786 frame, it is a big deal with a trial production cost of hundreds of thousands. It can be ruined in one sentence. It is not an exaggeration to say that it is a golden word.As the workshop director of Workshop No. 3, a middle-aged man knows that design and manufacturing are in conflict with each other. Design is about perfection, while manufacturing is about reducing costs and improving efficiency. However, people like Tang Lili, who can easily destroy hundreds of thousands of dollars, destroy their workshop.  No matter how strong the foundation is, it cannot withstand such wear and tear.

    So he gritted his teeth and started to upgrade his technology. Instead of destroying the high-cost door components in vain, it was better to use the money to improve his own level.  Since the existing equipment and technology cannot effectively complete the trial production of the J-73, it is necessary to learn new technologies and introduce new equipment to meet the trial production requirements of the J-73.

    In this way, Chenggong Factory took advantage of the opportunity of trial production of the J-73 to start its own technological upgrading process. However, this road was not smooth. After all, many technologies and equipment were still blank in China, and they could only be improved through imports.  However, what is embarrassing is that you cannot buy some key equipment and technologies even if you have money, because foreign countries will not sell them to you at all.

    For example, the shot peening technology that worried him the most as the workshop director of the third workshop had earlier contacted the Boeing Company in the United States and wanted to introduce two sets of spray-finished machines from them. The Boeing Company was very polite and led the way.  After a tour, they said: "Our equipment is self-developed. Due to their uniqueness and uniqueness, we cannot 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 read it, but we don¡¯t sell it!

    If you can't buy it, you have to make it yourself. The question is whether you have the experience and skills. You can't do it for a while. Just when the workshop director of the third workshop was in a panic, Tang Lili suddenly came to him and said that her lover was in Yonghong.  Someone in the factory developed the technology related to the shot peening machine.

    The director of the third workshop was shocked when he heard this. Don't say anything, let's meet him first!

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