The new type of fan blade designed by Li Tianfeng just now is an advanced wide-chord fan blade, which is also called "wide-chord hollow sandwich blade without convex shoulder". Hence the name, the blades of this new fan have a wide chord shape for increased mechanical strength and a hollow structure to reduce weight.

The new hollow blade is divided into three parts: the pot, the back, and the core. Its leaf pot and leaf back are made of two titanium alloy sheets, and between the two sheets are the "core" of the honeycomb structure also made of titanium alloy. The method of guò active diffusion welding connects the leaf basin, leaf back and leaf core. The new blades gain great strength at an extremely low weight.

Such a new type of fan blade has been used in today's internationally advanced mainstream turbofan engines, but Li Tianfeng believes that he can do better.

Such blades are much more advanced than fan blades with damping bosses, because fan blades with damping bosses have many disadvantages and shortcomings.

After the fan blades with damping bosses are assembled on the engine, the bosses on the fan blades are connected to form a ring hoop on the blades. When the fan blades are running, friction damping is created between the bosses to reduce the vibration of the blades. After the installation of the damping boss, the damping effect is obvious, but the shortcomings of the damping boss are also obvious.

With such blades, he increased the weight of the blades, and secondly, he lowered the efficiency of the fan blades. Moreover, if it is not properly designed, distortion will occur when the air flows through this boss at high speed, and the distortion of the air flow will cause the blades to produce greater vibration.

The blades of this type of string fan designed by Li Tianfeng are very wide, very large, and very thick, and generally speaking, such blades will be very heavy. But in fact, this is not the case, because the material is a relatively small density of titanium alloy, and it is still a hollow blade design, such a sheet is very light, very strong, and because the blade shape is very advanced. The leaves look very beautiful and very aesthetically pleasing.

Li Tianfeng spoke in great detail, introduced his fan blades in detail, and explained some technical points very thoroughly, Sun Xiaoping was almost fascinated when he heard it.

Liu Wei, who was next to her, listened to Li Tianfeng's explanation of this leaf, and her eyes were full of brilliance, and she looked at Li Tianfeng with bright eyes. Even if it is not as professional as Sun Xiaoping, Li Tianfeng explains it very easily. Liu Wei basically understood.

Liu Wei said happily: "Boss, will it be difficult to process and manufacture such advanced blades?" ”

Sun Xiaoping is good at design and understands some craftsmanship, but he certainly does not have a high level like Li Tianfeng, Sun Xiaoping also looked at Li Tianfeng.

Li Tianfeng smiled, "This kind of blade is compared to ordinary blades. It's definitely going to be a little more difficult to manufacture, though. As long as the manufacturability is fully considered, the difficulty is not as great as you imagined, according to our manufacturing strength, we can fully manufacture excellent fan blades. ”

The technical strength of Tianfeng Technology Co., Ltd. in manufacturing all kinds of aviation blades is really not blown, especially after having high-precision and high-speed grinding technology. The processing of this new type of fan blade is also relatively easy.

Li Tianfeng said that Sun Xiaoping was full of hope for this kind of fan blade, turbofan engine. The fan part is very important, and the high-performance engine fan is one of the important signs of a high-quality turbofan engine.

Excellent fan blades are undoubtedly one of the guarantees of high-performance fans, and Li Tianfeng personally designed the sketches of such a key part.

Sun Xiaoping communicated for a long time, and Sun Xiaoping was inaccurate in several places in the design, and he also consulted Li Tianfeng one by one. In the end, Sun Xiaoping left with Li Tianfeng's design sketch satisfied, and it was obvious that further design work would be carried out as soon as possible.

Li Tianfeng personally took a piece of snow-white drawing paper and spread it on the drawing table, ready to draw the design sketch of the next part.

Li Tianfeng drew the fan disc of this engine, the three major parts of the fan part of the turbofan engine, the fan blades, the fan tray, and the fan casing.

This is the first turbofan engine of Tianfeng Technology Company, and the important parts and key parts of this engine have about dozens of drawing numbers, and Li Tianfeng is ready to draw design sketches for these parts.

In the future, if Tianfeng Technology Company develops a second turbofan engine, Li Tianfeng may not do it himself, and may only grasp the overall situation and key issues.

In order to further train the design team, Li Tianfeng generally only draws design sketches, and the specific design details are completed by the following designers, and after these key parts are designed, Li Tianfeng may conduct a final review.

The snow-white drawing paper was spread on the drawing table, Li Tianfeng took the drawing pencil, pondered for a while, sketched the general outline of the fan plate in his mind, took a piece of straw paper, calculated, drew a figure, scribbled it, felt that it was about the same, and began to formally draw a sketch of this part on the drawing paper.

While drawing, while thinking, if the wrong place is wiped off and restarted, the fan disc belongs to the stressed structural parts, its structure is generally more complex than the blade, and the sketch is also more difficult, but Li Tianfeng's basic skills are very solid, and it took more than half an hour for the sketch of this part to be basically formed.

After taking a serious look, I felt that there were places to improve and made appropriate modifications, and after the final finalization, I marked some of the main dimensions, the technical requirements of the parts, and the places that should be paid attention to in the design, and it took an hour before and after, and the sketch was basically completed.

Liu Wei said: "Boss, although I don't study science and engineering, your sketches are really beautiful, and they are basically the same as computer drawing." ”

Li Tianfeng was obviously satisfied with his design sketch, smiled happily, and then said: "Mr. Liu, I don't know how Mr. Xu and the others are doing, have the negotiations with the other party been fruitful." ”

Liu Wei said: "Mr. Xu has been leading the team for two days, and there should be results." ”

Xu Lilong, according to Li Tianfeng's invitation, is leading a team to negotiate with the other party in a well-known domestic aviation bearing factory, because considering the current situation of domestic aviation bearings, Li Tianfeng believes that his turbofan must use higher quality bearings, especially the main bearings of the engine.

The turboshaft D engine uses domestic bearings, but limited to the quality of the bearing, the first turnover life of the engine is tentatively set at 2000 hours, although the maximum life test has reached 4685 hours, it is reasonable that the first turnover life of the turboshaft D engine is set at 3000 hours.

Considering the actual quality of domestic aviation bearings, Li Tianfeng still adopted a more conservative approach, the first turning life of the turboshaft D engine is tentatively set at 2000 hours, perhaps, after another one or two years, depending on the actual situation, the first turning life of the vortex D may be positioned at 3000 hours.

Now, Tianfeng Technology's turbofan engine is based on the domestic regional airliner market, and the economy of the engine is very important, and an important indicator of economy is that this engine should have a relatively long service life.

A short-lived turbofan engine that needs to be overhauled after a short period of use, not to mention economic performance. In order to make his turbofan engine have a relatively long service life, Li Tianfeng needs high-quality aviation bearings.

Xu Lilong went to this bearing factory, is one of the strongest technical strength of the domestic aviation bearing factory, Xu Lilong's purpose in the past, is to prepare with the aviation bearing manufacturers to discuss technical cooperation.

With high-quality aviation bearings, this turbofan engine may have a relatively ideal service life, and Li Tianfeng has great hopes for Xu Lilong's trip.

Xu Lilong went to this bearing factory according to Li Tianfeng's instructions, and he was fully prepared, according to Li Tianfeng's assumption, things should be relatively smooth, and now at this time, there should be preliminary results.

Just thinking about this, Xu Lilong's phone called, and brought a very bad news, Li Tianfeng's heart suddenly sank to the bottom.

………….

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