The combustion chamber casing, one of the important and key parts of the engine, and also the whole life parts of the engine, the so-called life parts, is from the new engine factory, until the end of the engine's life, generally not replaced.

It is not normal for such a full-life part to crack in the first overhaul, and it may be acceptable if it is said that cracks appear in the third overhaul.

Zhang Can also saw this crack, his heart sank, and Zhang Can said: "Boss, this is not normal, this is the first overhaul of the engine." ”

Li Tianfeng also nodded, recalling the design of the engine in his mind, in Li Tianfeng's opinion, there would be no problem with the design of the combustion chamber casing.

So, Li Tianfeng asked: "Mr. He, the number of engines returned to the factory for overhaul is twenty or thirty, let's check, is it an accidental phenomenon that cracks appear on the installation side of the combustion chamber casing." ”

Li Tianfeng attaches great importance to this matter and must find out clearly.

He Baitao is the deputy general manager of the technology of Qingshi production and manufacturing base, He Baitao said: "Boss, there are already 28 engines that have been returned to the factory for overhaul, and I will immediately check the situation of the combustion chamber casing of these 28 engines." ”

He Baitao immediately went to investigate, while Li Tianfeng and the others looked carefully around the combustion chamber casing, and Li Tianfeng even asked for a magnifying glass, holding a magnifying glass, and looked very carefully.

After looking at it, Li Tianfeng said: "This should be a fatigue crack, during the use of the combustion casing, fatigue occurs on the installation side, especially cold and hot fatigue, so this crack appears." ”

Hu Donghai next to him is the deputy general manager of production of Qingshi production and manufacturing base, Hu Donghai said: "Boss, what are we doing now?" Repair welding of the combustion chamber casing. Definitely not. ”

The accuracy of the installation edge is very high, not only has a precision positioning hole, but also the flatness of the installation edge itself is extremely high. There will be welding distortion that affects the accuracy.

Li Tianfeng looked at Zhang Can, and then said, "Zhang Can, what do you say?" How to repair? ”

Zhang Can has not been engaged in technical work for several years, but the technology has not been left behind, seeing Li Tianfeng ask himself, Zhang Can said: "Boss, in this case, you can only drill cracks on the installation side." ”

Li Tianfeng said: "Yes." Only drill the crack hole, in the tail position of the crack, drill a small hole with a size of one millimeter, the crack will not continue to crack, this is the most effective and easiest repair method. ”

Hu Donghai, who was next to him, immediately understood this and nodded.

Not only the receiver of the combustion chamber, Li Tianfeng picked up this receiver. After looking at the situation in other aspects, I thought to myself. There's no reason for a crack.

After taking a look and seeing that all the other parts were normal, Li Tianfeng did not believe in evil, so he personally took a micrometer and measured the thickness of the installation edge of the receiver.

Li Tianfeng said in his heart: "Sure enough. The thickness of the installation edge is out of tolerance, and the design of the thickness of the installation edge requires 4±0.025, in fact, it is about 5 wires thinner. ”

It turns out that the size is out of tolerance, which should be the main reason for the out-of-tolerance. Zhang Can finally understood in his heart.

He Baitao's efficiency is also very high, and it didn't take long to come over, "Boss, I checked it all, there are cracks in the combustion casing, it's just an accidental phenomenon, the combustion chamber casings of other engines are all normal, and none of them have cracks." ”

Li Tianfeng nodded, "The size of this combustion chamber casing is out of tolerance, so there are tiny cracks, Mr. He, check it, why is this casing out of tolerance." ”

He Baitao soon made it clear, the engine resume book, a clear record, when the engine was assembled, the combustion chamber casing was an out-of-tolerance part, and the wall thickness of the installation side was out of tolerance, but there was an inspection technician to deal with it and use it as it was.

Li Tianfeng was slightly dissatisfied, and said in a deep voice: "Mr. Zhang, you emphasize the discipline, the inspection technician processing authority, can only deal with the general size of the deviation, like this wall thickness size, is obviously an important size, such a size of the deviation, must be submitted to the non-conforming product review committee for processing." ”

Zhang Can nodded hurriedly, "Boss, we will immediately send a document to make it clear, and in addition, this time, we will post it as a classic case." ”

Li Tianfeng nodded in agreement, tens of thousands of employees of Tianfeng Technology Company, if you do not strengthen management, it is inevitable that some things will occur, in terms of management, especially in technical management, Li Tianfeng does not dare to relax, this incident, just as a case to inform everyone, warn everyone.

The maintenance of aero engines is gradually on the right track, and Li Tianfeng often comes to take a look, and the most diligent ones are the designers of the aero engine R&D center and the chief designers of the turboshaft D engine, who often come over.

The purpose of everyone coming here is to take a look at the situation of each part of the turboshaft D engine after 3000 hours of use, and combine these situations to optimize and improve the design of the turboshaft D engine in terms of design.

In the years of engine manufacturing and use, designers will continue to optimize and improve the design in combination with the situation of the engine.

After this, with the passage of time and accumulation, this engine will become more and more stable, the design will be more and more perfect, there will be fewer and fewer small faults, and the quality will be better and better.

………

Songzhou City, since the first two years, has built a huge industrial park, in this industrial park, there are basically manufacturing enterprises, among which there are mostly small and medium-sized machining enterprises.

These small and medium-sized machining enterprises are mainly engaged in processing parts, and there are dozens of such small and medium-sized machining enterprises in this industrial park.

These machining enterprises not only process auto parts and locomotive parts, but also some enterprises process aero engine parts.

Among these enterprises, some enterprises with a certain strength are processing parts for Tianfeng Technology Company, and some general parts are rough-processed.

Hu Dingwen is the owner of the Jinxing Machinery Processing Factory, which can only be regarded as a small factory in this industrial park, with more than a dozen sets of various mechanical processing equipment and less than 20 employees.

Recently, Hu Dingwen is very red-eyed, and his heart is also very entangled, for no other reason, a lot of machining around him is booming, and the reason for the boom is because he is processing parts for Tianfeng Technology Company.

Machining parts for Tianfeng Technology Company, the profit is not very high, but the price is fair, the batch is stable, and the monthly settlement is on time, and the processing fee is never in arrears, Hu Dingwen also wants to process such parts.

However, Hu Dingwen knew that his Jinxing Machinery Processing Factory could not meet the requirements of Tianfeng Technology Company, so he could only be anxious, and he could only envy and blush.

"Lao Hu, how are you doing? How are the benefits? ”

Hu Dingwen was in his office, thinking about these things, a middle-aged man walked into Hu Dingwen's office, Hu Dingwen looked up, and immediately stood up, this is his old acquaintance, the owner of a mechanical processing factory next door, Chen Guangquan.

"Mr. Chen, I can't compare to you, you process parts for Tianfeng Technology, and you make a lot of money, I can only be anxious."

Chen Guangquan smiled, "Processing parts for Tianfeng Technology Company, it is really good, last year, our factory settled the processing costs from Tianfeng Technology Company, which was more than 20 million." ”

More than 20 million!

Hu Dingwen felt envious in his heart, his Jinxing Machinery Factory, the output value of last year was less than seven or eight million.

Chen Guangquan took in Hu Dingwen's expression, smiled, and then said: "Mr. Hu, we are old friends, don't blame my brother for not helping you, let me tell you, recently Tianfeng Technology Company issued a document, there will be a large number of parts to be rough processing outside, many mechanical processing factories are full of energy, trying their best to prepare for processing business from Tianfeng Technology Company." ”

Hu Dingwen's eyes lit up, but soon dimmed, and he said a little discouraged: "Mr. Chen, the situation of our Venus is like this, and it may not meet the requirements of others." ”

Chen Guangquan said: "Mr. Hu, I give you an idea, that is, to see if you dare to do it, and whether you have the courage." ”

Hu Dingwen said: "Mr. Chen, you say." ”

Chen Guangquan said: "Tianfeng Technology Company's documents say that the enterprises that can process for them are divided into five grades, namely A, B, C, D, E five grades, all of which have corresponding requirements, you only need to borrow a little money, add a few CNC equipment, and then recruit two or three technical personnel to raise the management, basically meet the requirements of E-file enterprises, and you can take the processing business from Tianfeng Technology Company." ”

Hu Dingwen hesitated for a while, very moved, but thinking that it was too big an investment and too risky.

Chen Guangquan said: "Mr. Hu, don't hesitate, listen to my brother's advice, last year, Tianfeng Technology Company's sales reached more than 100 billion, and for many years in the future, I am optimistic about Tianfeng Technology Company, you are still worried that there is no processing business." ”

Hu Dingwen thought for a while, then gritted his teeth and said, "Okay, I'm going to get a loan to buy equipment this time." ”

Like Hu Dingwen, there are many small machinery processing factories in Songzhou City, and everyone learned that Tianfeng Technology Company not only issued a special document, but also prepared to take out the rough processing business of a large number of parts.

In doing so, Tianfeng Technology Company not only completely drove the entire surrounding economy, but also won great benefits.

By processing these rough machining businesses for everyone, Tianfeng Technology Company can concentrate its main production capacity for the finishing of parts, and there is no need to spend manpower and material resources on this unskilled rough machining.

In this way, Tianfeng Technology Company not only saves a lot of manpower and material resources, but also greatly increases the production capacity, and the monthly output of engines is maintained at the scale of two or three hundred units.

This also frees up capacity for the production of turbofan 21 and turbofan 25 engines in the future.

………

Today's two shifts, the second shift is complete. (To be continued......)