"Old Wen, I'm here again." As the two of them and the other comrades walked inside, they met an old comrade, who was almost the same age as Song Lao, and looked gray-haired, and now, he shook hands with Song Lao, and his face was also anxious: "Old Song, you said you, just call, you have to come and see, then come, you are here, it seems that we can immediately put our engine on the plane, let's go, take you to see, the comrade next to you, why is he so young, I haven't seen it before." ”

"Hello Mr. Wen, my name is Qin Feng, and I came uninvited." Qin Feng stretched out his hand, and when he heard Qin Feng report to his home, Wen Lao quickly took off his glasses, wiped them, and put them back on, only then did he see clearly: "Well, Lao Tang and I said hello, saying that you want to come and have a look, we just didn't think about it, you will come over with Lao Song." ”

For the 460 factory, the Jianjiao 7 project is of course also quite important, but, relatively speaking, in the 011 base, the safest is still their 460 factory, after all, they have always been producing turbojet-7.

The Liming Factory and the Liyang Plant have been producing turbojet-7, but compared with the products of the two factories, the quality is still different, and the army likes the turbojet-7 of the Liyang Factory, and the foreign military sales, exported by the 132 Factory, are also produced by the Liyang Factory, because of the long life!

The turbojet 7A renovated in Shenyang was put into small-batch production in 1979 after the design was finalized, and the first turn-over period was 50 hours; 03 batches were designed and finalized in December 1981, and the first reproduction period was 100 hours; The 05 batch was designed and finalized in 1989, and the first reproduction period was 200 hours.

Looking at the Liyang factory, the turbojet 7B they produced not only continued to increase the power, but also was officially finalized in August 1979, with a first reproduction period of 100 hours and a total life of 300 hours. In 1981, the life extension modified turbojet 7B B was developed, the first turning period was 200 hours, nearly ten years earlier than the dawn factory, and the later turbojet 7B III., which was finalized in 1992, reached 300 hours in the first turning period, and the total life was 900 hours.

It can't be compared with the life span of thousands of hours in the West, but in China, this is simply a triple jump, and an engine can be used for nearly a thousand hours, which is quite good.

Therefore, the Liyang factory also has a few brushes.

When it comes to Liyang Factory, of course, we have to mention the old Wen in front of him, almost all his life has been paid conscientiously on the aero engine, and the life extension of this turbojet 7 engine is mainly presided over by Wen Lao.

He personally formulated 14 improvement and life extension projects such as the five-stage air film cooling flame cylinder, and determined the overall modification plan, reaching the 200-hour life extension modification task.

Now, the factory is producing this engine in large quantities, on the one hand, it is delivered to the 132 factory for export, and on the other hand, it is used to equip the domestic J-7 fighter.

Now, it was not Tu Lao who came, but Song Lao, so Wen Lao knew that Song Lao was here to urge the vortex spray-13 project, and Wen Lao was of course very anxious about this project, but he knew that scientific experiments were not fake.

"Here's our turbine blade foundry." Mr. Wen took everyone into the building of the engine factory, and it can be seen that the equipment here is actually very primitive, all imported from the Soviet Union in the early years, and there is a big boiler-like thing in the middle, which is burning vigorously.

Qin Feng knows a little, many blades are cast, to put it simply, the molten steel flows out, directly into the mold, and it is cast, the furnace for heating in winter is cast in this way, but the engine blades must not be so simple.

The engine blades are under the condition of high temperature, high pressure and high speed, if there is a problem with the casting, such as bubbles inside, etc., there will be mechanical fatigue, flying out in rotation, tens of thousands of revolutions of the engine, once the blades are broken and flying out, it will definitely cause a serious accident, smash the engine shell, smash the oil pipe, and then it will be a fire.

"If it's a layman, then it will definitely be urged, but, Lao Song, you are also an expert, you know that this turbojet-13, and our original turbojet-7, there are many differences, we have improved the process for the thirtieth time, and we are ready to use the no margin precision casting process to cast turbine blades, using directional solidification alloy, you should have heard of it, right?"

Generally speaking, the appearance of the cast things is flawed, and it can be brightened only after polishing, otherwise there are too many small burrs or something, but this process is very demanding, and after the casting is made, it must be used directly, and the appearance is quite bright.

Just as he spoke, in the smelting furnace, the molten steel of the red-hot special alloy had already flowed out, and everyone felt a blazing breath, and the molten steel flowed into the special wax mold.

If you want to cast, you need to have a mold, the more accurate the mold, the more accurate it will be, the casting of this turbine blade is mainly determined by the pressing of this wax mold.

The blade is a complex shape, according to the prototype, the wax pattern is made, and then the process is also difficult, the temperature of the injection, the time of injection, etc., there are very strict requirements.

Although the West has now begun to adopt technologies such as monocrystalline turbine blades and powder metallurgy turbine discs, it has lagged behind in comparison, but for now, this technology is the first attempt in China.

This will definitely fail, it will take repeated attempts, even so, when Qin Feng heard that it was the thirtieth time, he still sighed in his heart, the breakthrough in the process is the most difficult, thirty times, maybe, three hundred, or even three thousand times to master it!

You can't be in a hurry.

Song Lao nodded: "This blade, it will take a while to cool down, I already know, Lao Wen, you pulled me here to tell me that you don't have a foreign worker." ”

A smile appeared on Elder Wen's face: "Let's go, let's eat, and say while walking, you and this Comrade Qin Feng are the most honored guests of our 011 base." ”

Song Lao smiled: "Lao Wen has always been very picky, this time, I still stained Qin Feng's light, by the way, Qin Feng, you came here, do you have any tasks?" ”

I'm here to see the Turbojet-13! Hearing Song Lao's question, Qin Feng could only answer truthfully: "I heard that the research and development of the turbojet-13 has not been completed here, and after a long time, I am afraid it will not be conducive to our J-7III." ”

Song Lao also nodded heavily, yes, he also came for this, this engine has been delayed again and again, and the entire J-7III project has to be dragged yellow.

"Comrade Qin Feng, take a long-term view, once this engine is imitated, it will be of great significance to us." Wen Lao said on the side: "Why do you have to look at the J-7III project, can't other aircraft be used?" ”

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