Chapter 671

It is the so-called layman watching the scene, the expert watching the door.

Professor Ali Khan is also a senior engineer who worked in the top aviation manufacturing giants such as Airbus and Boeing. Even though he doesn't know much about materials, he has been in contact with many people over the years.

In particular, fiber reinforced metal matrix composites, whether Boeing or Airbus, have been widely used in the production of large civil aircraft since the late 1970s.

Because of this, Professor Ali Khan is very clear about the complexity of this kind of materials in production.

Take today's most widely used diffusion bonding process for example.

First, the reinforcing fiber and the metal sheet need to be superimposed layer by layer like a pyramid, and then stand still for a period of time. After the adhesive of the cured fiber is fully combined with the metal, the two materials superimposed on each other can be put into a professional container to start pumping out the air, making the container in a vacuum state.

At this time, the electric heater starts to work, heating the two superposed materials in the container at high temperature to make them integrate with each other; after cooling, the pressure is pressed to make the two materials fully diffuse and compatible.

The process of high temperature and high pressure is long and complex, usually at the end of a day, a diffusion bonding furnace can not produce many composite plates.

That's all. The key is that this kind of diffusion bonding furnace needs to be supplemented with complex vacuum environment and high temperature and high pressure supporting equipment, and often these equipment are huge in volume, very complex in structure, and naturally expensive in price.

If so, as long as we can produce usable composite materials, it doesn't matter if they are more expensive.

The problem is that this kind of diffusion bonding furnace can't be used by just reading the manual. What's the degree of vacuum control? What is the proper temperature for heating? What is the pressure?

Even if you get all this stuff right.

Is the material heated or pressurized first? Or heating and pressurizing together? How many times do you have to do it together? If there is an interval between heating and pressing, how much is the interval to keep the material stable?

Such a vast sea of production data and process factors, equipment manufacturers will not tell you, what do you want? sure!

The manufacturer's price may be three or four times more expensive than the equipment, because this is the core of the product and the core parameter of industrial production.

Of course, it's lucky to get three or four times the asking price. The most important thing is that the equipment is sold to you. However, these core parameters are not given to you. You take your money completely and sleep on your body. You can't have a temper when it comes to you. Otherwise, people will strangle the accessories and the things you spend a lot of money on will become scrap iron.

In contrast, nb-998 laser plasma spraying equipment is a subversion of the previous process. Instead of high temperature, high pressure and vacuum, it is replaced by more sophisticated and advanced metal powder and high-energy laser beam. Just like printers, while spraying metal powder evenly, high-energy laser beam has fused these metal powder and glass fiber Curing, such a layer by layer down, can quickly produce the required composite sheet.

Not only the efficiency is improved several times, but also the flexibility is far beyond the old process.

It is necessary to know that the diffusion bonding furnace uses high temperature and high pressure to fuse the reinforced fiber with the metal material, so the thickness of the material must be guaranteed, otherwise, under high temperature and high pressure, the overlay layer with insufficient thickness may be damaged and completely discarded.

Therefore, if you want to make light and thin aerospace parts, you have to finish secondary, tertiary or even more subsequent processing to obtain the required standard pattern.

Nb-998 laser plasma spraying equipment is different. As long as the basic strength is guaranteed, thin materials can be produced if you want to make thin materials. If you want to make thick materials, it is nothing more than adding more layers of glass fiber and making more layers of metal powder spraying. The production is subject to the processing demand, and you can change as you want.

In addition, during the period when the Pakistani military delegation entered workshop 7, Professor Ali Khan saw that nb-998 had processed two kinds of plates.

One is three layers of 0.2 mm thick aluminum plate, sandwiched with two layers of 0.3 mm thick glass fiber layer, made of 1.2 mm thick composite plate, which is mainly used for the skin cover plate of yun15 aircraft.

The other is seven layers of 0.3 mm thick aluminum plate, sandwiched with six layers of 0.5 mm thick glass fiber, which is made into 4 mm thick plate, which is used for the cabin floor of yun-15 aircraft and the stiffeners of some secondary structures.

The whole conversion process is very smooth, but the operator input a few commands on the control keyboard.

Unlike the old technology, the product is single, and the subsequent processing is even more difficult, because it requires thinning, cutting, and even directly using multi axis machine tools to make parts. The complexity is no less than that of producing composite plates, which virtually increases the cost. Not to mention, the whole follow-up equipment is not affordable by a country with limited financial resources such as Pakistan I can't afford it.

So no matter what else, but in terms of cost, nb-998 laser plasma spraying equipment is equivalent to simplifying two to three major processes and 20 to 30 necessary processes. Its cost control ability is just against the sky, and a hundred million US dollars is really cost-effective.We should know that the old process, not to mention the follow-up plate processing equipment, just that set of complex and inefficient production equipment, can't get $700 million.

However, the equipment purchased with us $7.8 billion will not be as productive as a nb-998 laser plasma spraying equipment.

What's more, can someone give you the core production parameters for the $700 million purchased equipment?

The nb-998 laser plasma plating equipment of Tengfei group doesn't have such a saying, because people completely realize computer automation control, all parameters are input into the computer, and controlled by professional industrial software. There is no so-called disgusting thing that the equipment is bought back, and the core parameters are cut twice by people, because all parameters of Tengfei group are different from each other The equipment is fully integrated into one, and buying the equipment means buying these core production parameters.

As for whether other countries can obtain the core manufacturing data of nb-998 control status and materials from these industrial software and computers, although Professor Ali Khan wanted to do so, he had no choice but to smile bitterly.

Because all the data are reconstructed with computer language based on optimized mathematical algorithms, it's like the multi meaning phrase "multi person movement", which is first expressed in Latin and then presented to the public in Hebrew. Of course, the old drivers who speak this phrase understand the multiple meanings under the surface of the phrase.

Other people know so much about it. Even if we go back to the original sentence of "multiplayer movement", we may know that it may be a form of movement. How can we know that it contains indescribable alternative scenes?

It's a thousand miles away from the truth. Once it's completely different, let alone restored, it's estimated that the whole cracking plan will hit the street directly.

The important thing is that if we do this, if we can't restore the original state, the whole set of equipment will be completely scrapped. Only then can we really steal chicken and not eat rice.

So it's better to buy the equipment honestly than anything else.

"Haha ~ ~ Professor Ali Khan, general Rahman, you're welcome. I've said that we are brothers with you. You can't say that. So it's OK for nb-998 to have a price of 100 million US dollars, but we have a condition..."

At the moment when Professor Ali Khan and others' interest in nb-998 reached its peak, Zhuang Jianye spoke at the right time. When Professor Ali Khan and others heard that there were conditions, they immediately felt a thump.