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Seeing that Yang Xianfeng was slightly surprised, Li Tianfeng affirmed: "Mr. Yang, I am ready to subvert the traditional process and completely abandon the backward, time-consuming and laborious traditional process method of leaf polishing, which cannot guarantee the quality of the blade." ”

In Li Tianfeng's memory, with the development of the aviation industry, the manual polishing of the blades was gradually eliminated, and it was replaced by a variety of advanced technological methods to process the blades, so that the surface roughness of the blades could meet the requirements of mechanical processing, instead of using manual polishing.

Seeing Li Tianfeng's abandonment of manual polishing of blades, Yang Xianfeng reminded: "Tianfeng, the surface roughness of blades is very important, and even a key technical requirement, and it is generally difficult to achieve such surface roughness requirements through guò machining methods. ”

Aero engines, whether they are fan blades, compressor blades, or turbine blades, have strict roughness requirements, some blades have surface roughness requirements of 0.8, and some even reach the extremely high requirements of 0.4.

Roughness of 0.4 is really a very high requirement, to meet such a requirement, the surface of the blade has been very smooth, almost a little like a mirror, can easily reflect the shadow of people.

The reason why such high requirements are put forward on the blade surface is mainly determined by the performance of the blade and the working environment, when the engine is working, the relative speed of the airflow and the blade surface reaches subsonic speed, or even supersonic speed.

At such a high speed, if the surface roughness of the blade is not good and does not meet the requirements, the airflow will rub against the blade, a series of undesirable phenomena will occur, and even the engine may surge, affecting the performance of the whole engine.

Yang Xianfeng has been engaged in aero engine manufacturing for more than 20 years and is the chief engineer of Plant E, so he naturally knows the importance of the surface roughness of the blade, so he kindly reminded Li Tianfeng.

And Li Tianfeng naturally has his own considerations and plans, and this method must be abandoned for artificial polishing of the blades.

Manual polishing, is the use of air guns and other grinding and polishing tools, the use of fine sandpaper, with manual methods to polish the blades, aero engine blades, have strict contour requirements, some contour requirements are ten wires, some are five wires, that is, generally five to ten wires.

As we all know, the thickness of a hair is generally about seven to ten threads, and once the polishing tool is polished by hand, the blade contour will immediately exceed the tolerance, and the roughness will meet the requirements, but the contour will be strict zhòng out-of-tolerance.

This method is not advisable and must be eliminated, with such considerations, Li Tianfeng did not plan the polishing area in the No. 3 workshop.

"Mr. Yang, we must improve the process, abandon manual polishing, and adopt the method of mechanical processing to make the roughness of the blade fully meet the design requirements." Li Tianfeng said.

Yang Xianfeng: "Tianfeng, if you use mechanical methods, I'm afraid it won't work." ”

Li Tianfeng: "Mr. Yang, yes, you forgot about it, the vortex C centrifugal impeller that Tianfeng Technology Company processed for you a few months ago, as well as the large integral blade disc processed for Factory B, we use the CNC small feed high-speed milling processing technology, and the surface roughness of the blade fully meets the requirements." ”

Yang Xianfeng remembered that Tianfeng Technology really had this technical strength, and people easily met the requirements of the surface roughness of the blades.

Yang Xianfeng said: "Tianfeng, you really have this technical strength, however, the surface roughness of these blades is 0.8, and the surface roughness of some blades is 0.4, and the roughness of such blades is 0.4. ”

This is the truth, the use of reasonable processing parameters, the use of scientific milling tools, the blade surface roughness to 0.8 is no problem, but processing to 0.4 is not realistic.

Just like a bicycle, no matter how fast you drive, no matter how fast you ride, you can't compare to a rocket, and you can't go to the moon, if you want to process the surface roughness of the blade to less than 0.4, you must use other process methods.

Li Tianfeng obviously understood what Yang Xianfeng meant, and said with a smile: "Mr. Yang, I already have a process plan for blades with a surface roughness of 0.4. ”

"Oh, what's the plan?"

Li Tianfeng did not hide it, "Mr. Yang, I am going to use the grinding method to grind the surface of such a blade." ”

Yang Xianfeng is an expert, and immediately said: "Tianfeng, the blades have complex profiles, there is no way to grind, in addition, the grinding process is a very low efficiency, even if the blade can be grinded, that blade grinds down, without a day or two of effort, it will never be possible." ”

Of course, Li Tianfeng has already considered these things, Li Tianfeng said with a smile: "Mr. Yang, it is just a traditional grinding process, and what I want to adopt is a five-axis linkage high-speed grinding process, which will be a new process." ”

Hearing this, Yang Xianfeng's eyes lit up, "Tianfeng, this new type of grinding process has high requirements for machine tools." ”

Li Tianfeng nodded: "Of course, there must be an advanced five-axis linkage large-scale grinding machining center, in addition, there must be a very high level of CNC program programming, in addition, the grinding wheel used is not an ordinary grinding wheel." ”

"In this way, the difficulty is not ordinary, just this five-axis linkage large-scale grinding machining center, as far as I know, there are few such equipment in the world, even if we have such a process idea, but we do not have such equipment."

"Mr. Yang, the equipment will be there, and I am working with a well-known domestic university to jointly develop such a five-axis linkage large-scale grinding machining center."

"Ahh Yang Xianfeng was overjoyed, such a device actually began to be developed, "Tianfeng, when this equipment is successfully developed, I want to come over and take a look at its processing effect." ”

"Yes, no problem." Li Tianfeng readily agreed.

The university in cooperation with Li Tianfeng is very famous in China, and there is a national key real room for machine tools, software and hardware are very good, plus Li Tianfeng's funds, technology, and programs, it should not be difficult to successfully develop such a machine tool.

In Li Tianfeng's memory, the requirements for rough surface of various blades of advanced aero engines are getting higher and higher, and high-speed grinding has gradually become the mainstream process.

was taking Yang Xianfeng to the No. 3 workshop, Zhang Can's phone called: "Boss, the centrifugal impeller has begun the dynamic balance test, are you free to come over now?" ”

The centrifugal impeller was processed two days ago, and there was a little mistake when the blade was measured, and there was a false alarm, and now, it is ready to carry out the dynamic balance test in the first workshop, which is an important test that must be carried out for aero engine rotating parts.

"Zhang Can, I'll come over right away." Li Tianfeng said loudly.

Seeing this, Yang Xianfeng asked, "Tianfeng, is there something urgent?" ”

Li Tianfeng said: "It's not a hurry, the centrifugal impeller of our 'TFWZ001' turboshaft engine has been fully processed, and the processing quality is not bad, and now we are ready to carry out the dynamic balance test." ”

"Tianfeng, if it's convenient, I'll take a look too." Yang Xianfeng came to be interested.

"Of course, let's go." Li Tianfeng readily agreed.

The dynamic balance test is more critical, mainly to check whether the mass distribution of the parts is uniform, and how the vibration is under the rotating state.

We know that the rotating parts of the aero engine rotate at high speed in the working state, and the speed often reaches tens of thousands of revolutions.

This situation is absolutely not allowed to happen, therefore, to check the parts, the way to check is the dynamic balance, on the dynamic balancing machine, let the parts rotate, of course, this speed can not reach tens of thousands of revolutions, after the parts turn up, you can check the vibration of the parts, the mass distribution of the relative rotation shaft, where is the quality focus, where is the quality light, clear.

When Li Tianfeng and Yang Xianfeng walked to the dynamic balance area of the No. 1 processing workshop, they saw a lot of people, Qiu Wenan, Sun Xiaoping, Wu Yuhua and others were there, and the dynamic balance test was about to start.

This is the dynamic balance test of the first part of the 'TFWZ001' turboshaft engine, and a large group of people from the design institute all came over, and when they saw Li Tianfeng, everyone greeted each other.

Seeing that the processing quality of these two parts is good, and the blade type is one that he has never seen, or an advanced design of large and small blades, Yang Xianfeng's eyes lit up.

Seeing that he was almost ready, Li Tianfeng waved his big hand and said, "Start the test immediately!" ”

The operator of the dynamic balancing testing machine is an experienced master, who immediately picks up a part and installs it, then enters the relevant parameters, puts down the protective cover of the dynamic balancing machine, and then presses the start button, and the part slowly rotates.

The parts gradually rotate faster and faster, after reaching the predetermined speed, they rotate smoothly, and the shape of the centrifugal impeller is simulated on the computer screen of the dynamic balancing machine.

After about a minute or two, the alarm began to be raised on the computer screen, flashing and flashing, and the parts on the screen were the same, the color changed from green to red, and it also flashed and flashed.

The dynamic balance is unqualified!

There are many people who pay attention to the dynamic balance test, and everyone's eyes are staring at the computer screen, and when they see this, everyone's face changes slightly, knowing that there is a problem with the dynamic balance.

………

Today's fourth watch, the third watch will be sent!! R1152