Chapter 617

The leaders who have come to inspect know that Tengfei group is top-notch in the industry, but they did not expect to be so top-notch. They need to know that these leaders are not only able to study strategies and tactics and command wars. Many of them have professional engineer backgrounds. Some of them were even sent to the Soviet Union's Zhukovsky Institute of Aeronautics and Astronautics for further study in the 1950s and 1960s.

It is a proper technical leader.

Therefore, they are very clear about the value of nb-800 CNC machine tool introduced by Liu Chun. They can't help it because this kind of special machining machine tool is too important in the field of aerospace.

So that in some aspects, high-precision multi axis CNC machine tools can not do things, EDM CNC machine tools can easily complete.

For example, for the finishing of the inner hole of the low-pressure turbine of the aero-engine, the traditional process requires several machine tools, such as boring machine, milling machine, lathe, grinder, etc., which do not count in turn. In the middle, several heat treatments are needed to consolidate the material.

After the appearance of multi axis linkage machine tool, the complex multi machine tool joint machining is not needed. One machining center can complete it, and then one heat treatment, the finishing of the inner hole of the low pressure turbine is completed.

But is this really perfect?

Obviously not. This is mainly because the inner hole of low-pressure turbine of aero-engine is long, thin, small on both sides, large in the middle, complex arc in the inner wall, and it is an important bearing structure of aero-engine. It not only requires high machining accuracy, but also can't make the parts produce stress deformation in the machining process.

The accuracy of multi axis machining center is not to be said, but because its processing method is to use the mechanical tool to make the parts hard and hard mechanical cold processing, the stress deformation can not be avoided, which is why a key heat treatment is needed after processing. The main purpose is to eliminate the stress deformation of parts. Otherwise, if it is installed in the aero-engine, the service life will be short Well, if the engine stops due to the internal twist, it's not worth the loss.

This is mainly because this kind of machine tool is not a real contact machining, but a non-contact machining using the pulse discharge generated by the tool and workpiece, so it will not produce stress and deformation on the parts.

As for the micro cracks easily caused by traditional machining, it is even more impossible to form a shallow electric white layer at most. How shallow is it?

But 0.01mm!

This thickness can be completely ignored in general parts, even the parts with high requirements can be easily disposed of by special means.

In other words, the aviation parts processed by EDM numerical control equipment not only have high precision and wide range of materials, but also can be directly packaged out of the factory after simple processing, which is one step less heat treatment than traditional machining.

What is this?

Simplify process, improve efficiency!

Because of these eight words, any enterprise in the world will go crazy. You should know that heat treatment is a process that both eats technology and burns money. If the control is not good enough, all parts of a furnace may be scrapped. It's a blessing for any manufacturing industry to have such a less process.

Therefore, foreign aviation manufacturing powers have been popularizing EDM numerical control technology since the 1970s. The United States, in particular, has been in the forefront in this respect. Europe is a little worse. However, they have made some popularization through the introduction of American patents, but they still rely on German multi axis machine tools.

There are applications in the Soviet Union, but Lao maozi has just started in the field of numerical control, and before he goes deep into it, he has smashed all over the place. Therefore, their popularization of EDM is universal, but it is not as fast as the leap forward automation and high precision in Europe and America.

Domestic technology to foreign countries is still very close, naturally know the advantages of EDM CNC machine tools, long wanted to import from the United States and other developed countries.

However, in developed countries, even multi axis machining machine tools are listed in the list of export restrictions. This kind of high-precision EDM numerical control equipment, which can produce high-quality aerospace products, is more strictly controlled, and there is no way to buy it.

Originally, these leaders were still thinking about whether to wait for the international situation to stabilize and try to find other ways to get a few back from Europe and the United States. They didn't expect to see them here in the Tengfei group. They were not one, but three or four types, with a total of one or twenty. This is a bit scary. You know, if other factories can have one, they dare to say that they are leading in China Aviation power, there are one or twenty, is not among the world's first-class?

"It's no wonder that Mr. Liu said that they can reduce the progress to half a month. So many EDM numerical control machines cover almost all the processing of key parts of aero-engine. It's not impossible to reduce the production cycle without complicated heat treatment process." When Liu Chun introduced several EDM numerical control machine tools with different functions, some knowledgeable leaders or technical officers began to talk in private.

Listening to the evaluation of an officer nearby, a chief nodded with great approval: "indeed, this kind of machine tools belong to high-tech processing equipment restricted by developed countries in the world, and Tengfei group was able to break through. Obviously, we have underestimated these years."

"Yes." Another army chief in navy uniform also said with emotion: "they all thought that Tengfei group was making money. They didn't expect that they didn't give up in the high-end technology field. To put it mildly, there was no turbofan engine. With this NB series EDM numerical control machine bed, Tengfei group's position in the domestic aviation industry could be established.""That's right, but did you find that the head of the headquarters and the two comrades of the Second Artillery didn't seem as surprised as us?" At this time, a commander from the air force suddenly reminded us.

Several army leaders who fell behind just looked at the head of the headquarters. They really told the head of the air force in front of them that the head of the headquarters was not too surprised. On the contrary, his face was filled with unspeakable joy.

And the two army leaders from the second artillery, who followed the commander in chief, were even more plain and surprising, with a casual appearance.

None of them are stupid. As soon as you look at the scene, you can see that the Aerospace Department already has these CNC equipment. This explains why these things are not well known to outsiders. It is obvious that these machine tools are the supporting processing equipment for a new type of missile in the Aerospace Department, involving the national key equipment. A sensitive period of time is inevitable.

However, it seems that this sensitive period has loosened, otherwise the head of the headquarters will not be able to bring them here. We should know that in some cutting-edge manufacturing fields, they are also leaders at the level of the head of the army.