The turboshaft C engine is used for the power of the armed helicopter, and the latest type of armed helicopter in China will be equipped with an engine, and because it is a National Day gift model, the turboshaft C engine is the current number one task of the entire E factory, and it is also a political task.

At present, the main turboshaft engine of Plant E is the turboshaft B engine, which is installed in the army's current main armed helicopter, and it is a little embarrassing to talk about this active main armed helicopter, because the tonnage of this helicopter is small, the flight length is short, and the airborne weapons are even more backward, and it is not a little worse than the main helicopter in active service in the United States.

The main reason for such a big gap is that the turboshaft B engine is relatively backward, and the output power of the turboshaft B engine is only more than 300 kilowatts.

Because of the low power, the take-off gravity of the helicopter cannot be very large, and the corresponding armor is also very thin, and even there is no armor at all in many places, and even the weapons are greatly simplified.

The power of the US active armed helicopter, the power of a single turboshaft engine is close to 2,000 kilowatts, you know, the weight of the turbine engine and the turboshaft B engine in the United States is basically the same, and the output power is much larger, more than four times.

The turboshaft B engine can no longer meet the needs, and the new, turboshaft C engine with an output of about 1,200 kilowatts is very important, and the troops are also in urgent need of such a more advanced engine.

The turboshaft C engine is more advanced than the turboshaft B engine, but the technical content is correspondingly higher, and it involves a lot of new materials and new processes.

Unexpectedly, the processing of the turbine part encountered difficulties again, and Cheng Gang, who had no good plan, found Li Tianfeng.

Seeing Cheng Gang looking for himself, Li Tianfeng naturally would not shirk, and with Cheng Gang entering the office, after entering the office, Cheng Gang greeted Li Tianfeng warmly, "Xiao Li, sit, sit." After speaking, he made a cup of hot tea for Li Tianfeng himself.

Li Tianfeng was a little flattered, took the cup of hot tea with both hands, and sat down on the chair in front of the desk, as soon as he sat down, Li Tianfeng saw a turbine disc on Cheng Gang's desk, the parts were not large, and the diameter was about 120 mm.

Li Tianfeng recognized it at a glance, this is the first-stage turbine disc of the turboshaft C engine, and the tenon groove of the wheel disc has been processed, but according to Li Tianfeng's professional vision, this falcon groove is not very well processed.

The tongue and groove is used to install the blades, which is very critical, the turbine disc is one of the most critical parts of the whole engine, the diameter of the first-stage turbine disc of the turboshaft C engine is only 120 mm, such a small turbine disk, to withstand a lot of force, the image is a little bit, everyone should have seen the performance of the strong man pushing the car with his throat against the steel gun, this turbine disc is probably the same, but the strong man pushes the car slowly, and this turbine disc has to output more than 100 million power to promote the rapid flight of the aircraft in the work, And it also has to withstand the extremely harsh test of high temperature and high pressure.

Cheng Gang said: "Xiao Li, this is the first-stage turbine disc of the turboshaft C engine, and the 23 longitudinal tree-shaped tongues and grooves on the turbine disc have been processed, you can take a look." ”

Hearing this, Li Tianfeng picked up the turbine disc and looked at it, and soon, Li Tianfeng saw the clue, there was a visible groove on the surface of the tenon groove one by one, and the surface roughness was obviously problematic, so Li Tianfeng shook his head gently.

"Director Cheng, it seems that there is a problem with our broaching process." Li Tianfeng said.

Cheng Gang immediately glanced at Li Tianfeng approvingly, Cheng Gang didn't say what was wrong, but Li Tianfeng saw the problem at a glance.

"Yes, there was a problem with the broaching process, and the turbine disc was basically scrapped." Cheng Gangdao.

Li Tianfeng also secretly said that it was a pity, and said regretfully: "Director Cheng, this turbine uses the latest material, which is a powder-smelting superalloy, and this material alone is worth a lot of money!" ”

Cheng Gang nodded, "It's a pity, we don't have experience in processing powder metallurgy superalloys, and our technicians use the experience of processing ordinary superalloys to process the turbine, and there is a problem." ”

As soon as the conversation changed, Cheng Gang said: "Xiao Li, you take this turbine disk, study it carefully, and see if there is any better way, we still have three turbine disks to be processed." ”

Li Tianfeng nodded, "Director Cheng, then I'll take it back and study it carefully." ”

"Okay, I'll wait for your news." Cheng Gang watched with hope as Li Tianfeng walked out of his office with this basically scrapped turbine.

Li Tianfeng has repeatedly surprised people recently, and this time, Cheng Gang also has high hopes on Li Tianfeng, hoping that this problem that bothers him can be solved.

Seeing Li Tianfeng coming back with such a turbine disc, Zhang Can stood up, "Brother Li, this is the first-stage turbo disc of the turboshaft C engine?" ”

Li Tianfeng nodded and said: "Zhang Can, you go and find me the design drawings of this turbine disk, the processing process regulations, and the complete set of broach drawings of the broaching process." ”

Zhang Can hurriedly put down the work in his hand and went to look for these things, and it didn't take long for Zhang Can to come over with a large pile of drawings.

Commanding Zhang Can to put these drawings on the big reading table, Li Tianfeng looked at it there, and after looking at it for a while, Li Tianfeng had a rough idea in his heart, but for the sake of safety, he still had to go to a processing site.

The processing of this turbine disc broaching process is a vertical broaching machine imported from Britain in the eighties, in the eighties, this may be considered a relatively advanced equipment, but twenty or thirty years have passed, this broaching machine is obviously outdated, has been unable to keep up with the processing needs.

In some foreign advanced aero-engine enterprises, the use of high-precision CNC broaching machines, a stroke is at least seven or eight meters, or even ten meters, such a long stroke, processing tenon and groove can often be in place at one time.

The vertical broaching machine of the E factory has a stroke of only two or three meters, and it takes at least four or five strokes to process a tenon and groove of the first-stage turbine disc.

After carefully looking at the situation of this vertical broaching machine, Li Tianfeng frowned, such a hardware situation, even if he has full of skills, it may be difficult to give full play to it, Li Tianfeng's eyebrows wrinkled into a Sichuan shape, and he thought in his heart, this time he received a hot potato.

The worker who operates this broaching machine is surnamed Yan, and he is also a master, who has been engaged in broaching for more than ten years, and can be regarded as experienced. ”

Li Tianfeng was about to ask Master Yan about the processing of the first-stage turbine disc tenon and groove at that time, so Li Tianfeng said: "Master Yan, the first-stage turbine disc tenon and groove of the turboshaft C engine was processed by you, what was the situation at the beginning?" ”

Speaking of this matter, Master Yan shook his head: "Li Gong, you have also seen the situation of this broaching machine, it is not good at all, and the material of the first-stage turbine disc of the turboshaft C engine is obviously very hard, and the machine tool that was processed at the beginning is a little ......."

This Master Yan is also a chatter, a vigorous, very detailed description of the original situation clearly, after listening, Li Tianfeng further affirmed that this broaching machine can not meet the requirements is a big reason.

However, the whole E factory is not very good, are old-fashioned things, due to the technical blockade, high-precision CNC broaching machine is basically difficult to buy from abroad, E factory has not purchased a better broaching machine for many years.

"It seems that this time I really picked up a hot potato, the situation of this broaching machine is here, and it is very difficult to process such a high-precision tongue and groove." Li Tianfeng thought in his heart.

Just thinking like this, Li Tianfeng saw a large group of people coming from the aisle not far away, a middle-aged man with glasses and a very imposing look, and Liu Qingshan, the deputy chief engineer, could only pull aside, and Li Tianfeng, a few people next to the middle-aged people, basically knew each other.

Li Zhaojun, deputy general manager of pipe production, Yang Xianfeng, deputy general manager of pipe technology and chief engineer of E factory, etc., these are all giants of E factory, Li Tianfeng thought in his heart, could it be that this middle-aged man is a big leader, otherwise the giants of E factory would not be so hugging each other.

Although Li Tianfeng was slightly strange in his heart, guessing the identity of this middle-aged man, his face was still very calm and there was no nervousness.

The group quickly walked towards Li Tianfeng.

………