Super military empire

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No one would have thought that when the turbofan team was designing, the accuracy would be so demanding.

This is assembly accuracy, not machining accuracy.

The original design was not like this. In the original design, the assembly accuracy was actually 0.02 mm. After Liu Yijiu intervened, he directly increased the assembly accuracy requirement by nearly twenty times!

This is almost impossible for the design team and the assembly workers.

Even detection is difficult to detect.

However, Liu Yijiu insisted on achieving such a level of accuracy. No objection from the design team would be invalid. Naturally, the assembly workers could only do their best.

This kind of assembly accuracy depends on not seeing with eyes, nor checking with equipment.During the assembly process, it is difficult to correct for deviations using inspection equipment.It depends on the feeling that the ninth-level assembly fitters have accumulated decades of work experience and are almost against the sky.

This is not only the feeling of the brain and heart, but also their feel!

"Director Liu, this accuracy is simply impossible to achieve!" Qi Hai saw that these workers had assembled and disassembled, and had never been able to meet Liu Yijiu's requirements, although the accuracy of each assembly was always There is an improvement, but it only improves the assembly accuracy by 0.01 mm, which is several times worse than the minimum 0.003 required by Liu Yijiu."If this continues, the engine assembly will simply not be completed on time."

Qi Hai feels that the accuracy that can be achieved right now has far exceeded their requirements, more than doubled.

"Who among the masters of assembly said that it is impossible to achieve?" Liu Yijiu asked Qi Hai very seriously."None of them said it was impossible. You are not a professional assembler. Why are you in a hurry here?"

"I am worried that these parts will be damaged if they are always assembled and disassembled in this way. With such a concentricity requirement, there is basically no gap. The unilateral gap is 0.0015. This is really..." Qi Hai has his own concerns.

"The assembly accuracy of the impeller is related to the performance of the entire engine. The higher the assembly accuracy, the less likely the engine will vibrate. After assembly, we have no way to *** the assembled multi-stage impeller inside. ***Testing, even if it is tested, what can it do? Can it be repaired eventually? After repairing, how to ensure the strength?" Liu Yijiu asked Qi Hai back.

His theoretical knowledge is much richer than Qi Hai.

All the blades, the blades on each impeller, the weight difference will never exceed 10 grams, which is guaranteed by machining accuracy!

This is why it is necessary to perform a process after assembly, which is to worry about the difference in the material accumulated on the weld during welding, which will increase the weight difference between the positions of these blades, and avoid the weight of the engine impeller when rotating at high speed Different, the shape difference is too large to produce excessive centrifugal force, which causes the engine to shake.

Even the current assembly accuracy has reached an almost harsh level, but also to reduce the vibration caused by the centrifugal force generated during the operation of the engine.This has not greatly improved the performance of the engine, but it has indeed greatly enhanced the service life of the engine.

At this level, data is basically meaningless.

This kind of microscopic data is negligible, but it is the top display of a country's manufacturing capabilities.

"What's more, the assembly surface of all parts of the core components only leaves such a large gap range. At the same time, the surface roughness has reached the highest level of 0.4 that our machining equipment can reach, otherwise you think I will let the three zones Specially design and develop such grinding equipment? At the same time, the four districts are also required to specially develop laser detectors with such precision?" After Liu Yijiu said this, he ignored Qi Hai.

Instead, he ran to the assembly fitters who were carefully assembling the impeller, without speaking, watching them assembling in silence.

On this, Liu Yijiu was also powerless, and could only silently give these top players in the Republic an atmosphere, although he knew that this caused a lot of pressure on them.

If it were the integral turbine discs they produced, the assembly would be much less difficult.

Time, in the process of constantly installing and dismantling, day after day passed, the accuracy of the assembly, after the 0.005 mm hurdle, can no longer improve.

"Okay, let's do it for the time being!" Liu Yijiu's psychology is very happy for this accuracy, but there is no expression on his face. Instead, it still looks like we can barely meet the requirements. .

"Director Liu, I'm really sorry, we..." The four fitters who assembled the fans all said to Liu Yijiu with annoyance.

"In the current situation, we can’t improve anymore. Let’s do it for now. Our engines can’t wait any longer. Moreover, you have tried your best. Over the past ten days, your progress has been very impressive. Obviously..." Liu Yijiu comforted the four gaunt-faced old mechanics, and then said to Qi Hai, "Let the next department continue to assemble, the various parts outside, the pressure reducing valve, the fuel detection equipment, and the passing equipment. , The electrical equipment assembly continues. After the completion, test, if there is no problem, after returning to the test, directly participate in the acceptance test..."

The production process of the engine is extremely troublesome.

However, engine inspection and acceptance testing are more troublesome.

According to regulations, the assembled engine will be transported to the test workshop for preliminary testing. Generally, the engine will be supplied with fuel directly on the ground test platform. After running for a period of time, there will be no problems before returning to the production workshop. The entire engine is disassembled to become a single part state. Of course, some parts can be inspected without disassembly. Naturally, there is no need to be so troublesome, mainly for electrical aspects.

The disassembled parts will be returned to each assembly department, cleaned with gasoline, and then inspected. If there is a failure, the cause of the failure must be analyzed immediately, dealt with, and then reassembled.

Even so, these engines can not be directly mounted on the buttocks of the fighter jets to propel the fighter jets into the sky.

There is also an acceptance test, which is also carried out on the ground platform of the test workshop.

The testing process is all monitored by electronic information technology, that is, the engine is connected to the equipment in the test workshop to establish a local area network, and feedback to the monitoring computer with special software in the monitoring room. Simply put, it is actually A simulating fighter platform is built in the ground workshop, and the engine works on the platform, just as the pilot can detect the running state of the entire engine in the cockpit.It's just that the data of this acceptance test is more and more detailed than the pilot's monitoring.

Everything about the engine runs through external detection, such as ignition, fueling, etc. At the same time, the speed of the impeller, the air pressure at the air inlet, the thrust that can be provided, etc. are automatically detected and fed back to the computer.

Each of these data will be collected and used to build a database.

Only this monitoring software was developed after the turbofan-6 was completed, and it is still being improved.

In the acceptance workshop, Liu Yijiu, with a serious look, gave Qi Hai the right to issue orders. He is the chief designer and also serves as the chief engineer.

"Turbofan-8, No. 01 test ignition, countdown, 10, 9... 2, 1, ignition!" Qi Hai didn't have much words, and didn't look at the time or anything. After getting repeated confirmation, the engine ignition test After all there were no problems, the order was issued.

Although several turbofan-8s have been produced before, they were not successful.

Liu Yijiu asked to use this as the 01 machine.

This is the Republic’s first engine for fighter aircraft, not a test product, but a finished product!

"Buzzing..." Under the control of the operator in the monitoring room, the start button was activated. Through the glass window, you can see that the first-level fan at the front of the engine on the experimental platform began to slowly be driven by the power reserve. Spin up.

At the same time, on the computer display in the inspection room, the data of various engine-related equipment began to change, some of which are displayed in a curve graph on the coordinate system, and some are displayed directly with data...

Liu Yijiu and others stood at a distance of less than half a meter behind the monitoring personnel, staring at the data on the top while staring at the engine in the glass window.

"Give it oil!"

"Boom! Boom! Boom!" As the impellers of the entire engine rotate faster and faster, the jet fuel, which was originally still liquid, is turned into a mist state by the impellers and the pressure generated by them, and finally enters the combustion chamber. .

The electronic ignition device works at the beginning to ignite the aviation fuel whose pressure is not high. After the newly sprayed mist fuel into the combustion chamber enters, the flame in the original combustion chamber becomes more intense.

The tail of the engine was originally just orange-red flames, and the color began to gradually fade. At the end, the engine's throttle was opened to the maximum, and the color was close to white!

"Try afterburner!" Liu Yijiu said to the controller after running for dozens of minutes.

"Woo..." The speed of the impeller suddenly increased, causing the sound of the impeller rotation that was hidden by the roar of the flame ejected from the engine's combustion chamber to faintly spread.

"Boom boom boom..." The flame at the nozzle at the tail of the engine directly became lighter and almost invisible.

So far, the Republic’s first turbofan engine that can be equipped with three generations of fighters and let fighters soar in the sky has been successfully developed!