Take Off My Aviation Era

Before he finished speaking, Zhuang Jianye picked up a component on the countertop and added: "Of course, we can control the cost of the kinetic energy interceptor of the Lyj-18 missile at 8 million yuan, and it must be easy for the dl-520 and dl-527. Two sets of three-dimensional braiding machines are put into production..."

Having said that, Zhuang Jianye took this opportunity to introduce the two sets of three-dimensional knitting machines in front of the heads of troops and leaders on the scene.

Among them, the model of the three-dimensional braiding machine composed of three circular structures is dl-520, with 2400 carbon fiber spindles distributed around each circle, which can produce circular portholes and short structural truss beams in aircraft under program control; Structural truss beams, brackets, brackets and other components in the device.

The model of the three-dimensional knitting machine composed of two square matrices is dl-527. Each square matrix can increase and decrease the internal spindles according to different needs. At present, the room type matrix used in workshop 5 is equipped with 5000 spindles. It is precisely because of this that dl-527 can produce larger components.

For example, aircraft can not only produce important load-bearing structural components such as skin frames, keel beam frames, and special-shaped frames, but also take on core structural components such as landing gear, helicopter flexible beams, and main structural parts in the center of the propeller hub.

As for the application of spacecraft, let alone the kinetic energy interceptor of the lyj-18 missile, the shell of the kinetic energy interceptor, the foreign currency of the internal fuel tank, the tail nozzle of the small rocket vector engine, the connector and the support ring , The support plate of the highly sensitive infrared detector, and the bracket of the laser communication receiver are all manufactured by dl-527.

However, whether it is dl-520 or dl-527, what is produced is the same thing, that is, three-dimensional composite materials.

Also known as the true second-generation composite material.

Yes, you read that right. At present, the so-called t300, t500, and t700 carbon fiber composite materials in the world are only an evolution of the first generation of composite materials, far from being called the second generation of composite materials.

The reason is very simple, that is, the preparation methods of these composite materials are flat application, whether it is connected with resin materials for high-temperature curing, or using an automatic laying machine to wind layer by layer according to the mold, the roots of this type of composite material are layered. of.

And this kind of layered treatment brings an insurmountable disadvantage, that is, the specific strength and specific modulus in a specific direction cannot achieve satisfactory results; the layered structure also leads to In high temperature environments, composite materials are prone to oxidative delamination, which affects the safety of the entire aircraft.

Because of this, although carbon fiber composite materials such as t300, t500, and t700 have been born for more than 20 years, and various metal matrix composite materials based on them are also very mature, these composite materials are still unable to become the main structure in the aviation and aerospace fields. The main reasons for truss beams, keel frame beams, landing gear, and high temperature and heat resistant components.

Because the layered paving structure cannot make the composite material reach the consistency and compactness of the traditional metal, not to mention the high-temperature heat-resistant parts, the oxidation delamination phenomenon cannot be overcome at all.

In the early years, China's take-off of anti-ship ballistic missile reentry warhead carbon \\ carbon composite material is because of this reason several tests failed.

The non-carbon\carbon composite material cannot withstand high-temperature burning, but the molecular structure of epoxy resin in the layer-by-layer paving process completely fails under the action of high temperature, causing the paving layer to peel off and finally burn through the entire warhead.

There are two ways to solve this problem. One is to increase investment in chemical R&D and develop a new type of epoxy resin material that can withstand the high temperature of 2500 degrees Celsius, which is used to overcome the super high temperature of reentering the warhead surface at hypersonic speed.

The other is to directly jump over the complex first-generation composite material technology, enter the second-generation composite material, completely abandon the traditional technology of layer-by-layer composite material manufacturing, and use a way to break the traditional way to combine the composite material fiber in the composite material. The preforms that you want to manufacture are directly made under mutual entanglement, so as to form a new three-dimensional composite material.

Compared with the first-generation layer-by-layer composite material, the second-generation three-dimensional composite material has too many benefits. The most important point is that this composite material can fully utilize the excellent performance of carbon fiber. Come out, it can achieve very good specific strength and specific modulus in all directions. Because of this, the second-generation three-dimensional composite material fully meets the quality requirements of the aircraft’s main bearing structure, which can replace metal in a large amount. Become the main driver of aircraft weight reduction.

In addition, the three-dimensional composite material also shows excellent performance for high temperature resistance, and can withstand high temperatures of up to 2387 degrees Celsius. Based on this three-dimensional composite material can be widely used in aero engine combustion chambers and turbine blade bases. , Tail nozzles; and important heat-resistant areas such as engine tail nozzles, connectors, and high-temperature warhead shells in the aerospace field.

For the same carbon fiber products, there is such a fundamental difference, and the two generation differences are divided from this, which makes outsiders seem a little unbelievable, but it is not difficult for insiders to understand.

This is like building a house, layer by layer with bricks glued together, and it is not strong enough to build various structures, frames, truss beams and dampers inside.

Three-dimensional composite materials belong to the latter kind of complex structure, that is, using the toughness and plasticity of the fiber, a series of complex structures are woven into it through a complex array arrangement to form a strong preform.

This method is simple to say ~www.readwn.com~ as if as long as you understand the principle of the loom, you can give it a try.

However, the facts are far from simple as imagined. If you understand the principle of the loom to produce the second-generation three-dimensional weaving machine for composite materials, then New Delhi, Bangladesh, Egypt and Myanmar, which are major textile countries, should be among the developed countries. Rather than just waiting for the Western masters to enjoy food at the low end.

In fact, there is only one country in the world that has mastered the second-generation composite technology, and that is the United States. They began research in this area in the mid-1970s, and achieved preliminary results in the mid-1980s, and the U.S. Atlantic Machinery and Equipment Corporation immediately implemented it It is rapidly spreading among research institutions and aviation giants such as NASA, Boeing, Lockheed Martin, etc., so that the level of aerospace manufacturing in the United States is quickly separated from the world average.

It is not an exaggeration to say that the U.S. National Missile Defense System, Theater Missile Defense System, stealth combat aircraft, new-generation strategic transport aircraft, and stealth strategic bombers can be developed and quickly put into service. They are inseparable from the extensive application of second-generation composite materials. This has also become an important symbol of American aviation hegemony.

And now, with the use of China Ascendas related equipment, to a certain extent, it is tantamount to obtaining admission tickets for this type of aviation hegemony!