Next to Li Tianfeng, stood Sun Xiaoping, Qiu Wenan, and the director of this laboratory. As designers, Sun Xiaoping and Qiu Wenan naturally also paid great attention to the low-cycle fatigue test of fan blades.

If the test is successful, it means that the design of the fan blades is very successful, and if there is a problem in the test, it is more troublesome.

Seeing that the police appeared, Sun Xiaoping and Qiu Wen'an sank in their hearts, and they were inexplicably slightly nervous, and the two knew that something should be wrong.

Li Tianfeng said: "Director Zhang, stop the test immediately and remove this fan blade." ”

Director Zhang of the laboratory immediately carried out Li Tianfeng's instructions, stopped the test urgently, and took off the fan blades.

Li Tianfeng took the fan blades, and then said loudly: "Give me a magnifying glass!" ”

The magnifying glass was quickly taken, and of course Li Tianfeng roughly guessed what the problem was, Li Tianfeng took the magnifying glass and checked it carefully and carefully at the root of the fan blades.

Sure enough, tiny cracks appeared at the root of the fan.

Generally speaking, like all kinds of blade parts, if cracks are to appear, they are generally concentrated in the root of the blade, because the root of the blade is the most stressed and the force is most concentrated, and the same is true for this fan blade.

Li Tianfeng gave the magnifying glass to Sun Xiaoping, and Li Tianfeng said: "You can also take a good look, there are tiny cracks at the root of the fan blades, and this fan blade is considered to be wasted." ”

After taking the magnifying glass, everyone looked at it carefully and carefully one by one, and after reading it, everyone's faces were a little unsightly.

Fan blades are critical and important parts. It is very important in the engine, and there must not be the slightest problem, let alone a serious thing such as a crack in the root.

Li Tianfeng said: "Everyone has finished reading it." It's more serious than we think, and now, we have to find out why. ”

Sun Xiaoping said: "Boss, there should be no problem with the design of the fan blades, after excluding the design problem, then it can only be a problem with manufacturing or material." ”

Li Tianfeng nodded. Li Tianfeng is very clear about the design of the fan blades, and it was the design sketch drawn by Li Tianfeng himself. In terms of design, Li Tianfeng also thinks that there will be no problem.

Qiu Wen'an said: "What we need to do now is to immediately conduct a detailed inspection of this fan blade to find out the real cause. ”

Li Tianfeng agreed: "Conduct a detailed and comprehensive inspection immediately. Find out the real cause. ”

This piece of blade. Immediately sent to a detailed examination, Li Tianfeng was very concerned, naturally it was impossible to leave, just here, waiting for the results.

Li Tianfeng waited for the results, and the inspection was carried out very quickly, and in less than an hour, the results came out. There is no problem with the processing technology, and all the dimensions of the blades are qualified. There is not the slightest problem.

The problem lies in the material, the material of this blade is defective, at the root of the fan blade, there is an inconspicuous material defect, because it is inconspicuous, it has not been found, and even the material inspection has not found it, until the low cycle test was exposed.

Li Tianfeng didn't mean to blame the material inspector, because this kind of superficial defect happened to be in the blind spot of the inspection and was difficult to find.

To put an end to this material defects, can only be strictly controlled from the production process of material blanks, located in the Qingshi production base of the "Hercules" material production workshop, the formation of a few months, many employees are new employees, such a thing is reasonable.

Li Tianfeng said: "It seems that we must strictly control the material production process, and for the material production workshop, we must have a major rectification." ”

Sure enough, Li Tianfeng did what he said, strictly rectified the material production workshop, and even fired a few people, which touched the employees of the entire Tianfeng Technology Company, especially the new employees of the company.

Even if they are new employees to the company, they no longer dare to act sloppily, but play a spirit of 12 points, and usually be more strict with themselves.

With the development and growth of Tianfeng Technology Company, a large number of new employees are recruited every year to supplement their strength, and Li Tianfeng has been worried that there will be a situation like "the forest is big, and there are all kinds of birds".

In this case, Li Tianfeng is absolutely not allowed to appear, in terms of management, he has not dared to relax in the slightest, and with this incident, Li Tianfeng has rectified it ruthlessly.

Of course, these rectifications are something to come later.

Sun Xiaoping said: "Mr. Li, it seems that the low-cycle fatigue test of the fan blade needs to be redone. ”

Li Tianfeng nodded, and then said, "Director Zhang, how many qualified fan blades are there?" ”

Director Zhang of the laboratory said: "Mr. Li, there are three more blades, these three blades, before the low-cycle fatigue test, we must carry out strict inspection, and we must ensure the smooth completion of the low-cycle fatigue test of the fan blades." ”

Li Tianfeng nodded and said: "Mr. Sun, you personally pay attention to the low-cycle fatigue test of our fan blades, and report to me when you have the results." ”

Li Tianfeng needs to pay attention to a lot of things, and he doesn't have so much energy, so this matter is the most suitable to be handed over to Sun Xiaoping.

Sun Xiaoping said: "Boss, don't worry, I will pay attention to it personally." ”

Li Tianfeng has been very busy recently, and there are really a lot of things, not only to care about the development of turbofan 21 engine and turbofan 25 engine, but also to pay attention to the production and operation of Tianfeng Technology Company.

Fortunately, Sun Kang, Xu Lilong and others are more powerful, otherwise, such a big company, Li Tianfeng would have to be busy, and it would be impossible to have so much time and energy to focus on the development of the engine.

……

With the passage of time, when entering May, the trial production of all parts of the turbofan 21 engine was completed, and the relevant tests of each part were basically completed, and the first prototype of the turbofan 21 began to enter the final assembly in the final assembly workshop.

Li Tianfeng just came back from the Chengnan base, and the first thing he did when he came back was to take Sun Xiaoping and Zeng Qinghai into the assembly workshop together.

Compared with the beginning of the year, there is a big difference between the current Chengnan base and the Dachang Gate of the Chengnan base has been completed.

Grandiose. The beautiful and atmospheric factory gate is close to the Chengnan Ring Road, if you pass by the Chengnan Ring Road. You can see this big factory gate, all the locals of Songzhou City, everyone knows that this is the southern base of Tianfeng Technology Company.

In front of the factory gate, it is wide, and it is directly connected to the southern ring road of the city, and the traffic is very convenient. Entering from the factory gate, a wide, straight asphalt main road is on either side of this main road. The office building is nearing completion and is putting the finishing touches on the interior.

The huge aircraft R&D center has been built to a height of more than 20 floors, and it is estimated that it will be capped in another month.

The rest of the construction is also in full swing. Such as the construction of major plants. The construction of the airport, etc., and even, Tianfeng Technology Company has been drawing up an equipment procurement plan, and the total value of the first batch of equipment procurement has exceeded 10 billion.

After taking a look at the Chengnan base, Li Tianfeng returned to the headquarters of Tianfeng Technology Company with satisfaction, and as soon as he came back, he immediately took Sun Xiaoping and Zeng Qinghai to the engine assembly workshop.

The test and verification of various parts of the turbofan 21 engine have basically passed smoothly. The same is true for the low-cycle fatigue test of the fan blades, after the test is repeated for the second time. Passed without a hitch.

The three of them walked into the assembly workshop, the huge assembly workshop, a busy, the models that are being assembled are turbofan 16, turbofan 17, turbofan 18 and turbofan 20 engines.

Turbofan 16, turbofan 17 and turbofan 18 engines are all civil airliner engines, the monthly output of the three engines is stable at about 12 or 30 units, turbofan 20 engines are military engines, at present, the main equipment is J-10 fighters and J-11 fighters, the monthly output is about 30 or 40 units.

The headquarters of Tianfeng Technology Co., Ltd. has more than 20,000 people, including more than 10,000 production workers, and the total number of engines produced per month is about 15 or 60 units, and the output is very stable.

In addition to these mass-produced engines, the final assembly workshop has now added a new member, the turbofan 21 engine.

This engine, in the assembly workshop began the assembly of the first engine, Li Tianfeng attaches great importance to this engine, no, as soon as he came back from the south of the city, he immediately entered the assembly workshop.

In the compressor assembly area, many workers are assembling compressors.

The compressor of the turbofan 21 engine, a total of six stages, is all designed as an integral blade disc, and the compressor blades and compressor wheel discs are integrated, and there is no longer a need to install blades.

The main parts of the compressor part, in addition to the six-stage integral blade disc, also have the front and rear shaft journals, as well as the compressor bolts, and the front and rear shaft journals are made of titanium alloy.

Seeing Li Tianfeng and others, the workers greeted Li Tianfeng one after another, Li Tianfeng smiled and nodded, waving his hand, everyone is busy with their own, don't care about yourself.

In the compressor assembly area, there are compressor rotors of various engines being assembled, and Li Tianfeng is concerned about the compressor rotor assembly of the turbofan 21 engine.

The assembly of the compressor rotor is almost complete, and two workers are installing the front and rear journals.

One of the older workers said to Li Tianfeng: "Mr. Li, the design structure of the compressor rotor of our turbofan 21 engine is really easy to assemble, and Lao Meng and I will basically complete the assembly in less than an hour." ”

This naturally, there is no need to install compressor blades, if it is the previous design structure, the compressor wheel disc and compressor blades are separated, and each compressor rotor blade is hundreds, and these blades must be weighed one by one, counterweight, numbered, and installed, which is very cumbersome.

After the installation is completed, the wheel disc and the blade together have to be dynamically balanced, if the balance is unqualified, it has to be restarted, and the assembly is not only cumbersome, but also the efficiency is relatively low.

However, in the past, most of the materials of the compressor rotor were made of titanium alloy, and the material could not meet the requirements of designing as a whole blade disc, so the design of the blade and the wheel disc could only be separated.

Li Tianfeng nodded, the turbofan 21 engine such a compressor rotor design, the manufacturing cost is relatively low, and the assembly is convenient, but there is a problem, in the process of assembly need to be very careful, Li Tianfeng came to take a look at the assembly of the compressor rotor, in addition to taking a look at the progress, but also to see, process technicians, as well as assembly workers, whether everyone has paid attention to and found this problem.

………

Today's two watches, the second one is sent! (To be continued......)