Of course, Li Tianfeng also noticed that as the dynamic balance began, Li Tianfeng's eyes had been staring at the computer screen, and seeing such a situation, Li Tianfeng's face also changed slightly, knowing that the dynamic balance was unqualified.

Just now is a low-speed dynamic balance, the speed of the parts is only 300 rpm, under normal circumstances, the low-speed dynamic balance is relatively easy to qualify, and the general problem is high-speed dynamic balance test.

The operation of the dynamic balancing equipment is a more experienced master, seeing this, decisively terminated the dynamic balance test, after the parts stop rotating, the protective cover of the dynamic balancing machine is opened, holding a marking pen, on the centrifugal impeller parts on the dynamic balancing machine, made a mark.

"Mr. Li, this direction is a little heavier, and some materials must be removed in this direction."

Hearing this, Li Tianfeng nodded a little, when he designed the centrifugal impeller, he took into account the possibility of unqualified dynamic balance, and designed a special area for removing materials, which can be polished to remove a little bit of material in this area.

Li Tianfeng said: "Then remove a little material now, and then continue to move and balance." ”

How much material is removed, the computer screen of the dynamic balancing machine has been shown just now, and it shows the direction of the material, which is not a difficult task.

The master dismantled the centrifugal impeller from the balancing machine, and then went to the grinding area next to it, and used the grinder to remove a little material.

After removing a little material, the weight of the centrifugal impeller in this direction will change, and the dynamic balance test just now showed that it is heavier in this direction, and it should be about the same now.

Thereupon. The operator took this centrifugal impeller, reinstalled the dynamic balancing machine, and continued to start the low-speed dynamic balancing test, this time it was much better, although it was still unqualified. But the values shown are much smaller.

A part, no matter how clever and advanced it is designed, no matter how good its processing quality is, as long as the dynamic balance test is carried out, there will always be an unbalanced amount, and this amount is large and small. Generally, it is deemed to be qualified within the allowable range, and it is deemed to be unqualified if it exceeds this range.

The second time the low-speed dynamic balance, although the situation was much better, but it was still a little unqualified, and the operator did not need Li Tianfeng's orders. Immediately, the parts were disassembled, a little bit of material was removed, and the third low-speed dynamic balancing was carried out.

As the start button is pressed, the parts slowly get up, and gradually reach the set speed of 300 rpm, after the speed is stable, the computer screen has no alarm prompt, and the amount of unbalance is also displayed. Within the scope of qualification.

"Mr. Li, the low-speed dynamic balance is qualified." The operator reported.

Hearing this, everyone was light-hearted. It was really nervous just now, everyone almost didn't dare to come out, but now it was quiet, almost only the sound of everyone's breathing, and more than a dozen pairs of eyes were staring at the computer screen.

The low-speed dynamic balance is finally qualified!

While everyone quietly breathed a sigh of relief, Li Tianfeng said: "Continue to carry out high-speed dynamic balancing." Take a look at the results of high-speed balancing. ”

The parts are already installed on the balancing machine, and there is no need to reinstall them. Just re-enter the parameters from your computer and launch the button. High-speed balancing began.

On the computer screen, the centrifugal impeller of the simulation rotates slowly, vividly, clearly, everyone looks at the computer screen, the parts begin to rotate slowly, and then gradually accelerate, the speed has been rising, until it reaches the speed of 2000 rpm.

The speed of high-speed dynamic balance can be set according to the actual situation, generally 1500 to 3000 rpm is appropriate, and 2000 rpm is the speed set for the dynamic balance of the centrifugal impeller.

There was silence all around, everyone was staring at the computer screen, it should be that the speed was relatively fast, and the dynamic balancing machine made a low sound.

As the speed gradually rises, everyone's heart hangs higher and higher, and even the heartbeat begins to gradually accelerate, when the speed of the centrifugal impeller reaches the set speed of 2000 rpm, everyone's heartbeat is also rapid, and even some people breathe a lot heavier.

Don't go wrong!

Must qualify!

Many people are praying in their hearts, and Li Tianfeng is the same, his attention is all on the computer screen, and he also hopes that the high-speed dynamic balance can be qualified.

However, it backfired!

After the speed reached 2000 rpm and stabilized, it didn't take long for the computer to start alarming, and on the computer screen, the high-speed rotating centrifugal impeller also changed from green to red, and it flashed again and again.

High-speed dynamic balancing is unqualified!

The master who operated the dynamic balancing machine looked at Li Tianfeng, saw that Li Tianfeng's face changed slightly, and said worriedly: "Mr. Li, what should I do next?" ”

Li Tianfeng was very decisive, waved his hand, and then removed some of the materials, and then continued to carry out high-speed dynamic balancing. ”

The operator complied, pressed the stop button, and after the part stopped rotating, he took out the marker, marked the part, marked the part to go to the material, and then took the part and went to the side to polish it to remove the material.

High-speed dynamic balancing, a total of five times before qualified, metal materials removed a large lump, although the design of the area to allow the removal of materials, however, Li Tianfeng saw such a situation, his heart is still uncomfortable, even if the final dynamic balance of the parts is qualified.

Seeing that Li Tianfeng's face was a little ugly, Yang Xianfeng comforted: "Tianfeng, this situation is much better than the dynamic balance of our vortex shaft C centrifugal impeller, we were also two centrifugal impellers at the beginning, and the dynamic balance is unqualified, and all the metal materials that are allowed to go to the material area are not qualified." ”

Li Tianfeng was in a slightly better mood, the dynamic balance just now had not yet reached that level, although there was a little bit of polished material, but in the end it was still qualified.

The dynamic balance is qualified, and you can continue to the next test, but it will not affect the entire development process, after thinking about it, Li Tianfeng sighed, it seems that things can only be like this.

Qiu Wen'an said to the next side: "Mr. Qiu, it seems that we will continue to make a little change to our centrifugal impeller to optimize its dynamic balance performance." ”

Qiu Wen'an nodded, fully agreeing with this.

The dynamic balance is unqualified, and removing the material in the key direction is the most important method, and it is also the only method for this centrifugal impeller, but the material just now did go a little too much, and a large piece of potholes was more ugly, and Li Tianfeng was not satisfied.

The "TFWZ001" turboshaft engine is the first aero engine of Tianfeng Technology, and Li Tianfeng will definitely try his best to pursue perfection in the quality of the engine, and the small design improvement of the centrifugal impeller will definitely be implemented immediately.

At the beginning of the design of the centrifugal impeller, there must be no problem in the design theory, but there is no problem in theory, which does not mean that there is no problem in practice, because there will be various adverse factors, otherwise, there is no need to carry out a large number of various verifications and tests, otherwise, the development cycle of the aero engine will not be so long.

Back in his office, Li Tianfeng's mood is low and heavy, with the "TFWZ001" turboshaft engine began to process various parts, began to carry out various tests, all kinds of verification, all kinds of problems, all kinds of problems will emerge one after another, there are some technical problems, may still be unforeseeable, the real test will also come.

After taking a sip of tea and thinking about the series of technical problems that may be encountered in the future, there was a knock on the office door.

"Knock, knock, knock!!"

It was Liu Wei who came in, and after coming in, Liu Wei saw that Li Tianfeng's face was not good, and his feelings were not high, so he couldn't help but suppress what he was about to report.

Li Tianfeng observed the words and knew that Liu Wei must have something, so Li Tianfeng asked, "Mr. Liu, what is the matter?" ”

Liu Wei wanted to speak again and again, not knowing whether to say it or not, because this was bad news, and at this time, Li Tianfeng's mood was obviously not good, if he said the news again, I don't know how Li Tianfeng was.

Li Tianfeng seemed to be mentally prepared, and waved his hand: "Mr. Liu, just say anything directly, I'm fine." ”

After thinking about it, Liu Wei said: "Boss, we have been in contact with the organizer of the air show in the past few days, and we have also contacted a vice president of the other party to convey our intention to participate in the air show to the other party, but the other party refused. ”

This is really bad news, and for Li Tianfeng, it is terrible. Originally, Li Tianfeng had great hopes for this air show, and also wanted to get a piece of the air show, even if his "TFWZ001" turboshaft engine design has not yet been completed.

Such an air show only comes once every two years, and if you miss this year, you will have to wait for another two years, Li Tianfeng is unwilling, and after hearing the news, Li Tianfeng's mood suddenly reached the bottom.

With a glimmer of hope, Li Tianfeng asked, "Have you faxed all the details of our Tianfeng Technology?" ”

Li Tianfeng hopes that the other party will see the scale and nature of his business, and may be able to let Tianfeng Technology participate in this air show.

Liu Wei said: "Boss, I faxed our company introduction materials over, and also called in person, but the other party said that private enterprises like us are not considered, and the participants in this air show are all large international companies or well-known domestic aviation companies." ”

"Mr. Liu, you step down first, let me think about it." Li Tianfeng said.

Watching Liu Wei leave his office, Li Tianfeng secretly thought in his heart, Lao Tzu must participate in this air show, and he must participate!!

…………

Today's fourth watch, the fourth watch is !!!

What about everyone's commuter passes? What about referral tickets? The more the merrier! (To be continued) R466