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(Brother who rewarded without subscribing,I hope you can use the reward coins to subscribe to the latest chapter.,Although it's a little troublesome.,At least let the subscription be more.,So that the gourd dares to explode more violently.。 That's right, it's because of this problem these days, plus a little thing, and there are fewer updates...... ）

No one would have thought that the turbofan team would design with such a demanding level of precision.

This is assembly accuracy, not machining accuracy.

The original design is not like this, the initial design, the assembly accuracy is actually 0.02 mm, and after Liu Yijiu intervened, he directly increased this assembly accuracy requirement by nearly 20 times!

This is almost an impossible task for the design team and for the assemblers.

Even testing is very difficult to detect.

However, Liu Yijiu insisted on achieving such a level of accuracy, and the design team had no objection, so the assembly workers naturally had to do their best.

This kind of assembly accuracy depends on not seeing with the eyes, nor by the equipment to detect. During assembly, it is difficult to use inspection equipment to correct deviations. Relying on it, it is the feeling that the decades of work experience of the ninth-level assembly fitters have accumulated almost against the sky.

It's not just the feeling of the brain and the heart, it's the feeling of their hands!

"Director Liu, this accuracy is impossible to achieve at all!" Qi Hai saw that these workers had been assembled and disassembled, but they had never been able to meet Liu Yijiu's requirements. Although the accuracy has been improved every time it is assembled, it has only improved the accuracy of the assembly by 0.01 mm. It is several times short of the minimum 0.003 required by Liu Yijiu. "If this continues, the assembly of the engine will not be completed on time."

Qi Hai felt that the accuracy that could be achieved in front of him had far exceeded their requirements, more than doubled.

"Who of these masters of assembly said that it is unattainable?" Liu Yijiu asked Qi Hai very seriously. "None of them said it was unattainable, you weren't a professional fitter. Why the rush here? ”

"I'm worried that if I keep assembling and disassembling like this, I'm going to damage these parts. Such concentricity requirements. Basically, there is no gap, a gap of 0.0015 on one side, which is really ......" Qi Hai has his own worries.

"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 be to vibrate. After assembly, we have no way to ****** inspect the multi-stage impeller assembled inside, even if it is detected, what can it be? Will patching be possible eventually? After repairing, how to ensure the strength? Liu Yijiu asked Qi Hai rhetorically.

His theoretical knowledge is much richer than Qi Hai's.

All the blades, the blades on each impeller, will never differ by more than 10 grams in weight. This is guaranteed by the machining accuracy!

That's why it's important to do a machining process after assembly, because I'm worried that there will be a difference in the material accumulated on the weld during welding. It will increase the weight difference between the positions of these blades, and avoid excessive centrifugal force caused by the difference in weight and shape of the engine impeller when rotating at high speed, which will cause the engine to vibrate.

Even today's assembly accuracy is almost demanding, in order to reduce the vibration caused by the centrifugal force generated during engine operation. This is not much of an improvement in the performance of the engine, but it is a very large enhancement to the service life of the engine.

At this point, the data is basically meaningless.

This kind of microscopic and negligible data is the most top-level display of a country's manufacturing capacity.

"What's more, the assembly surface of all the parts of the core component only leaves such a large gap range, and at the same time, the surface roughness has reached the highest degree that our machining equipment can achieve 0.4, otherwise do you think I will let the third zone specially design and develop such grinding equipment? At the same time, the fourth zone is required to develop a laser detector with such accuracy? After Liu Yijiu said this, he didn't pay attention to Qi Hai anymore.

Instead, he ran to the assembly fitters who were carefully assembling the impellers, and without speaking, silently watched them assemble.

In this regard, Liu Yijiu was also powerless, so he could only silently give the top masters of these republics an atmosphere on the side, although he knew that this caused them a lot of pressure.

If it were a monolithic turbine disc that they produced, it would be much less difficult to assemble.

Time has passed day after day in the process of constantly installing and dismantling it, and the accuracy of the assembly can no longer improve a single inch after passing the hurdle of 0.005 mm.

"Alright, that's it for now!" Liu Yijiu is very happy about this accuracy, but he doesn't show any performance on his face, but he still looks like he can't meet the requirements, so we can barely do it at present.

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

"The current situation can't be improved any longer. First of all, our engines can't afford to wait. Moreover, you have done your best, in the past ten days, your progress is very obvious......" Liu Yijiu comforted the four haggard old technicians, and then said to Qi Hai, "Let the next department continue to assemble, and the assembly of various parts outside, pressure reducing valves, fuel testing equipment, passage equipment, and electrical equipment continues." After completion, the test is carried out, and if there is no problem, after the inspection is carried out after returning, the acceptance test is directly participated......"

The production process of the engine is extremely troublesome.

However, the inspection of the engine and the acceptance test are more troublesome.

According to the regulations, the assembled engine will be transported to the test workshop for preliminary testing, generally directly on the ground test platform facing the engine for oil supply, running for a period of time, no problem, and then return to the production workshop, the entire engine is disassembled, become a single parts state, of course, some parts can be inspected without disassembly, naturally do not have to be so troublesome, mainly for the electrical aspect.

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

Even so, these engines could not be directly mounted on the butt of the fighter jet and propel the fighter into the sky.

There was also an acceptance test, which was also carried out on the ground platform in the test shop.

The test process is all monitored by electronic informatization, that is, the engine is connected with the equipment in the test workshop to establish a local area network, and fed back to the monitoring computer with special software in the monitoring room, simply put, it is actually built in the ground workshop to build a platform that simulates a fighter, 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 detected by this acceptance test is more and more detailed than that monitored by the pilot.

Everything about the engine is operated by external detection, such as ignition, fuel throttle, etc., at the same time, the speed of the impeller, the air pressure of the air intake, 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.

This monitoring software alone was developed after the completion of the turbofan-6 and is still being improved.

In the acceptance workshop, Liu Yijiu, who looked serious, gave Qi Hai the right to give orders, he was the chief designer, and he also served as the chief engineer.

"Turbofan-8,01 test ignition, countdown, 10,9...... 2, 1, ignition! Qi Hai didn't say much, and he didn't look at the time or anything, and after getting repeated confirmation that there were no problems with the engine ignition experiment, he gave an order.

Although several turbofan-8s had already been produced, they were not successful.

Liu Yijiu asked that this machine be used directly as the No. 01 machine.

This is the first engine for a fighter in the republic, not an experimental product, but a finished product!

......Under the control of the operator in the monitoring room, the start button was activated, and through the glass window, it was possible to see that the first-stage fan at the front of the engine above the experimental platform began to rotate slowly under the impetus of the reserve electricity.

At the same time, on the computer display screen in the testing room, the data of various engine-related equipment began to change, some of which were displayed as curve graphics on the coordinate system, and some were displayed directly as data......

Liu Yijiu and the others were standing less than half a meter behind the monitors, staring at the data above and the engine in the glass window.

"Oil!"

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

The electronic ignition device works at the beginning, igniting the jet fuel that is not at high pressure, and after the newly injected fog fuel enters the combustion chamber, the flame in the combustion chamber becomes more violent.

The rear of the engine was originally just an orange-red flame, but the color began to fade gradually, and finally, the engine throttle was opened to the maximum, and the color was close to blazing white!

"Try it with afterburner!" After running for dozens of minutes, Liu Yijiu said to the controller.

......The speed of the impeller suddenly intensified, and the sound of the impeller turning, which was masked by the roar of the flames ejected from the engine's combustion chamber, was faintly heard.

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

So far, the first turbofan engine in the real meaning of the Republic, which can be equipped with third-generation fighters and allow fighters to soar in the sky, has been successfully developed!

(To be continued.) )