I! Pretending to Be Reborn, Director of Doomsday Hoax

"Second, better passing performance! The machine with hydraulic transmission has good and stable low-speed performance. With this property, the adhesion between the nuclear power train and the ground will increase, and the chances of rollover and tilting will be greatly reduced. !"

"The third advantage is better comfort! After adopting hydraulic transmission, the differential engine can start smoothly, and it can perform stepless speed change in a large range, reducing the vibration and impact of the differential engine itself!" Xu Fu stared at the design drawing dumbfounded, "But, behind this, there seems to be...a planetary gear structure? I'm right, Director Xu, is that a planetary gear structure?"

Xu Qiu nodded, "Exactly. To be precise, this is the auxiliary transmission."

"Relying solely on the hydraulic torque converter, although it can also transmit and increase the torque, the torque ratio is not large, and the range of speed change is not wide, which is far from meeting the working conditions of our nuclear energy differential engine..."

"In order to further increase the torque, expand the range of speed change, and improve the adaptability of the differential engine, I installed an auxiliary transmission behind each torque converter!"

"These auxiliary transmissions, which are composed of planetary gear mechanisms and actuators such as clutches, brakes, and one-way clutches, can ensure a stronger performance of the differential engine!"

Everyone was dumbfounded, and there was a continuous sound of gasping...

First the difference engine, then the nuclear energy difference engine!

This is more than a leap of the times. The steam differential engine and the nuclear energy differential engine are not of the same order of magnitude at all!

In terms of energy density alone, nuclear energy is millions of times higher than fossil fuels.

And with the help of the difference engine driven by nuclear energy, what kind of terrifying computing speed and computing efficiency will it have?

Xu Fu was in a state of madness.

He is 80 years old. In his life, he has been passionately in love with machinery, but he has never had a piece of work that can dazzle him.

But now, this nuclear difference engine is making him tremble...

"Director Xu, can you entrust me with the task of manufacturing this nuclear difference machine..."

Xu Fu excitedly closed the more than 200-page structure diagram.

Just the first three pages are enough to show how exquisite the workmanship of this "Difference Machine Design and Manufacturing Mechanical Engineering Drawings" is!

He really wanted to build this thing by himself, which was regarded as the pinnacle of mechanical history, a top mechanical work that had been lost for more than two hundred years.

"The manufacturing of the difference engine is directly related to the control core of the nuclear-powered train. Without the difference engine and the lack of computing power of a mechanical computer, the entire nuclear-powered train will become a lump of iron." Xu Qiu said.Xu Fu naturally understood what the nuclear energy difference machine meant. He got up and saluted, and said, "Xu must be devastated. For Director Xu and Dragon Kingdom, let this ancient technology see the light of day again..."

Xu Qiu nodded, "Professor Xu, I will leave the construction of the nuclear difference engine to you."

"Let's... work together against the extinction of the sun!"

boom!

Zou Botao, Xu Fu, Ji Chengping and the others suddenly stood up and greeted Xu Qiu.

The same sentence echoed in their minds...

Let's fight together... the sun goes out!

Tiandu Suburb, Capital Iron and Steel Group.

This is the largest steel production enterprise in the country. The steel products it produces, as well as its subsidiary products and processed products, are all benchmarks in the industry.

This huge group used to provide raw materials for the Dragon Kingdom's bird's nest, the amazing building with a mesh structure, and most of the alloys and steel came from the Capital Iron and Steel Group.And just an hour ago, Wang Xinke, the chairman of the Capital Iron and Steel Group, received a red-headed document.

"Development and Production Indicators of Extremely Cold Reliable Rails"

"Rails?"

The construction of an underground city requires a large amount of steel, but it is basically used for the construction of houses and cities. The construction of steel rails is to build a railway transportation system in the underground city? If this is the case, the temperature of the underground city will also increase. Above zero degrees Celsius, there is no need for extremely cold steel rails!

Wang Xinke looked on with doubts.

[In order to ensure the safety of train transportation on the surface, it is necessary to use extremely cold and reliable steel rails.

The steel rail needs to meet the characteristics of impact toughness not less than 230MJ per square meter at absolute zero, that is, minus 0.25 degrees.

Specific indicators need to meet the following standards:

The instantaneous strength varies according to the content of C(+), C「(+), Al(.) and V(+).

Yield point depending on V(+) content.

Relative shrinkage as a function of Al(+) and V(+) content.

The impact toughness KCU varies according to the content of C(.), Si(+), Al(+free V(+) at minus two hundred degrees.

And the impact toughness KCU that changes according to c(-), Mn(+), Si(+), 0(.), N(+) at absolute zero...] a whole page of material requirements standards , making Wang Xinke's scalp tingle!

Previously, the Capital Iron and Steel Group had manufactured materials for NASA's manned spacecraft,

Even the spacecraft raw materials, which can be called the highest standard in the industry, are not as demanding as this red-headed document issued by the Emergency Bureau!

"Surface train transportation.....Dangerous Bureau, they plan to build trains on the surface?!"

"After the sun goes out, the temperature on the surface of the earth is said to reach minus two hundred degrees Celsius. Any living thing will become extinct at such a temperature..."

Wang Xinke's mind was shocked!

In fact, a few minutes in an environment of minus [-] degrees is already the limit, and minus [-] degrees Celsius can take a person's life within ten seconds...

Build a train on the surface, what is transported inside, materials?people?

Wang Xinke can't think of any train that can block this terrifying extreme low temperature from the outside of the train.

With such an extreme low temperature, it is impossible for people to survive, and most of the materials will be damaged or even directly destroyed due to the low temperature.

"In our country, besides dungeons, do we have any other means to counteract disasters?"

After a brief moment of shock, there was ecstasy.

Living in such a country, there are endless cards, trying every means to ensure the safety of people's lives...

What else is there to be dissatisfied with?

"Call the engineers from the technical department to come over, the country has ordered that we have to design a steel rail that can maintain stability under extremely cold conditions!"

In addition, arrange the administration department and the personnel department to immediately open a brand new production line, and the wages of all workers in this production line will be doubled. "

"I must select elites for me, but if half of the staff come in through the back door, if there is any trouble in this production line, all the people in charge will pack up and leave!"

An hour later, a brand-new production line was opened. The entire Capital Iron and Steel Group, more than 2000 employees, selected a hundred elites with more than ten years of smelting and casting experience.

The group of smelting workers were excited and speculated about what to do next.

"What special steel is it built?"

"Definitely! I heard that there is a deep laboratory in our dungeon. It is said that there will be a gas explosion 3000 meters underground. When the time comes, use a pipe to draw this energy up, and it will become electricity! ' said a man in a helmet.

"It may be other equipment! Not long ago, the old site of our Capital Iron and Steel Group was requisitioned, and a group of arrogant people lived in it!"

The workshop is noisy and noisy, and at this time, the engineers in the laboratory are also noisy.

Chief engineer Wo Chengwen of Capital Fengtie Group stood up. He had participated in the design of the surface covering of the space agency's manned spacecraft and the fuel base.

Wo Chengwen said: "In order to ensure the extreme cold resistance of these rails, we must consider the hydrogen content in molten steel, which determines the critical value of white spot sensitivity in steel!"

"Moreover, at the same time, the oxygen content in the rolled material must also be considered, which determines the content of non-metallic inclusions!"

"Therefore, I recommend the vacuum sealing molding method!"

Vacuum sealing molding method, also known as negative pressure molding, is also called vacuum film molding in some places.

This is a new casting method widely used in the production of aluminum alloy, cast iron, graphite, steel, stainless steel and other special alloy castings.

If you want to make extremely cold steel rails, the required steel properties must be very strong.

This may be the strongest, most cold-resistant, toughest, most yielding steel alloy in human history! !

The process of vacuum sealing molding method was included in the "National Key Industry Cleaner Production Technology Guidance Catalogue" ten years ago, and the Capital Iron and Steel Group just happened to win the bid and became the first batch of enterprises to experiment with this method.Two years ago, Capital Iron and Steel Group completed the technological feasibility experiment of this process on railway steel castings, and based on the experimental results and the investigation and design of vacuum sealing molding methods at home and abroad, Shougang Group produced the "Four Engineering Side-by-side vibrating trolley mobile vacuum. Vacuum sealing molding line"!

And Wo Chengwen is one of the persons in charge of this project. In the Capital Iron and Steel Group, and even in the entire Dragon Country, when it comes to the degree of understanding of the vacuum sealing molding method, Wo Chengwen said that it is second, and no one dares to admit that it is the first!Wo Chengwen said: "We have experience in the implementation of vacuum sealing molding method and a mature production line."

"Besides, in the past two years, our bolster and side frame vacuum sealing molding methods have passed the technical review of the expert group of the former Ministry of Railways, and have been unanimously praised by Professor Xu Fu and Professor Ji Chengping!" Everyone was silent, and they were all considering whether to use this craft.

But soon, someone stood up and refuted.

Capital Iron and Steel Group, a special steel expert, and the former developer of alloy materials for the main structure of the bird's nest, has provided special steel materials for several weapons to the military. His name is He Yude.

"I don't agree with what Engineer Wo said!"

Wo Chengwen looked over and asked in a tone of asking for advice: "Senior He, please advise!"

"What the country wants is extremely cold steel rails, which need to maintain good toughness and impact at absolute zero!"

"Currently, Xiongguo is the one that has gone the farthest on low-temperature reliable rails. But...the limit temperature of most of their rails is around minus sixty degrees. As for minus two hundred degrees, it's unheard of! "

"Therefore, what we want to design may be the world's first super steel that can withstand high temperatures of minus two hundred degrees!"

"This kind of steel for extremely cold rails must have strict access requirements in addition to strict technical conditions and quality standards based on the consideration of operational safety."

"What we need to face up to is that although our Shougang Group has sufficient experience in the vacuum sealing molding method, due to the lack of systematic and in-depth shareable casting technology, production technology and theoretical research results, coupled with domestic and foreign applications in railway There are only a handful of enterprises that mass-produce steel castings for rolling stock, and the production technology they master is strictly protected. It is very difficult for us to effectively control the unique defects of this process

, The yield rate is too low! "

Everyone present nodded silently.

The vacuum sealing molding method is indeed unique and has many advantages, but its defects are too prominent!

The first is the carburization defect.

Low-carbon steel castings cast by this process, including stainless steel, are prone to surface carburization.

After several years of research, Shougang Group finally determined that this so-called surface carburization is actually carburization, which generally occurs within four millimeters of the surface of the casting.

Wo Chengwen retorted, "Carburization defects are easy to solve, just control the casting wall thickness, film thickness, coating synthetic resin content, cavity ventilation effect, gating system design, sand particle size, vacuum degree, air extraction, pouring temperature and speed. .not difficult!"

With a dark face, He Yude scolded: "You can call this not difficult! How many parameters do you want to control?!"

He continued: "There are also oxidation and oxidative gas cut defects!"

"This process is different from green sand casting. Its molding and pouring process needs to continuously suck air into the cavity to maintain the pressure difference maintained by the cavity!"

"And the price of this is that the damaged parts in the cavity and the parts where the paint is not dry are prone to serious oxidation defects!"

"Oxidation gas cutting defects are even more serious, mainly appearing at the parting surface, or serious air leakage parts. In this case, installing backing plates and taking sealing measures cannot remedy it, and the entire steel will be scrapped directly.

Wo Chengwen was speechless.

As the leader of the vacuum sealing molding method, he naturally has enough confidence in this process. However, as He Yude said, although it is true that special steel and extremely cold steel with very superior performance can be prepared, but

There are also many disadvantages of this process!

Moreover, many defects will directly lead to the scrapping of steel products.

Nowadays, the construction of dungeons is in full swing. There are more than 600 cities in the country, and a thousand dungeons are in urgent need of steel. A large amount of scrap steel will affect the production of steel.

"Then what should we do?" someone said helplessly.