"Let's not say it yet, let's go directly to the second layer, otherwise it will be difficult to know the real situation. Early the next morning, Zheng Yucheng and Xie Kai were ready to set off for Erzhong.

When he set off, Zheng Yucheng was about to notify the double side, but was stopped by Xie Kai.

"It's not really necessary, they know we're coming. Zheng Yucheng knew Xie Kai's purpose.

The two are now re-casting, not only them, but many heavyweights will come here, and even Minister Shen Hong will personally come here to sit here, in order to ensure the success of this casting and avoid scrapping.

Xie Kai still insisted.

Zheng Yucheng was helpless, so he borrowed a 212 jeep from the power factory, and the two drove directly to Erzhong.

The power factory originally had a better car, but Xie Kai had more feelings for this kind of car, and Zheng Yucheng had always liked this car, even if the shock absorption and other effects were not good, outside, he still drove such a car.

When I arrived at the gate of the double, I was asked to notify the external relations department of the double.

After Jiang Ming and the others found out, they hurriedly ran to the door to greet Zheng Yucheng and Xie Kai.

After some greetings, Zheng Yucheng went straight to the point, "Director Jiang, how are you preparing for casting this time?"

"It's ready, you guys came at the right time, start casting this afternoon, I just came from the casting workshop, Minister Shen, Director Tang, they are all in the workshop." Jiang Ming saw that the two of them drove over by themselves, and he didn't bring anyone else, so he hurriedly invited the two in.

Zheng Yucheng directly got into the car and drove to the inside of the casting workshop.

The whole foundry workshop is completely a newly built light steel structure workshop, and in the open space outside the workshop, a rectangular casting with a black and brown surface is placed on the side, and the outside is very corroded.

"This is the scrapped girder before, and now I don't know how to deal with it, and it's not easy to flame cut or something......" The car stopped next to the waste girder outside the foundry workshop, and seeing Xie Kai staring at this thing, Jiang Ming hurriedly introduced.

Xie Kai walked over and observed this thing next to each other, the rusty casting, and he couldn't see anything at all.

"This is rough-working?"

"The large margin of the four sides was removed with the gantry planer, and the castings that had not been processed could not be tested for flaw detection. The previous casting was not very well thought out during cooling, and the internal grain structure was very coarse......"

"It's normal for the internal grain structure of the casting to be coarse. "On the surface, there aren't many problems seen.

It's just that on the surface of the casting, there are irregular holes the size of a thumb in some places, which is the trachoma caused by casting defects.

In the middle, this defect is even more pronounced.

After Xie Kai saw it, he didn't say anything, and followed him directly into the casting workshop.

In the foundry workshop, like a furnace, before entering the door, I felt a heat wave rushing towards me, and in an instant, sweat soaked the back of my clothes.

On either side of the entire workshop are eight huge melting furnaces, which are melting the steel ingots in the furnaces.

In the center of the workshop, a one-man tall huge sand casting mold is placed like this.

To Xie Kai's surprise, there was also a layer of shell around the mold, just like the ancient coffin was divided into several layers. In the gap between the mold and the shell, a large amount of black carbon is laid.

When the two entered, several men wearing safety helmets were holding drawings and pointing around.

Xie Kai's face was full of doubts.

took the hard hat handed over by Jiang Ming and put it on his head casually, and walked inside.

"When you are ready, you are ready to ignite, and you must make sure that the whole mold is heated evenly and the temperature is consistent. A technician in his 50s, wearing a safety helmet, pointed to the drawings and briefed several people around him, Minister Shen Hong said.

"What's the matter?" Xie Kai came up, originally about to figure out the situation, but he didn't hear anything.

What should I do with carbon in the middle mold?

"You're here?" Shen Hong looked at Xie Kai with a smile on his face, "I heard that you are very good in this exam." ”

"If I wasn't careful, I didn't expect this question to be so simple. Xie Kai was not modest at all, looking at Chen Mingshan on the side, he was thinking in his heart that when he ran to study philosophy, Dean Chen would vomit blood.

Chen Mingshan was a little awkward when he was looked at by Xie Kai, thinking that there was something wrong with his appearance, and he didn't find any problems after checking for a long time.

But it's hard to ask.

"What is this for? Isn't it casting? What are you doing with carbon? Xie Kai asked, pointing to the mold next to him.

This mold is not small.

He also knows that when casting, the mold is easy to deform at high temperatures, which has a great impact on the quality of the casting.

"In the past, the casting was too fast to cool on the outside and the heat dissipation on the inside, so the internal grain structure was coarse...... According to our analysis, during the casting process, when the molten steel comes into contact with the mold, it will cause the joint to cool down quickly......" Chu Guorong explained to Xie Kai.

"But if the heating temperature is too high, won't it damage the sand mold and affect the entire casting?" Xie Kai asked with a frown.

Previously, it was because it cooled too quickly, so there were major defects in the quality of the entire large casting.

Now you want to reduce the cooling rate by heating outside the mold, which makes the whole process more difficult to control.

Once there is a problem with the process, there is absolutely only scrap.

The molten steel in the surrounding smelting furnaces was almost completely melted.

"For this casting, a team of hundreds of people has done dozens of experiments in the past few months, constantly improving the method, and studying the timing of cooperation, so that we have such a plan. It's dirty, but it works. Shen Hong said, "Otherwise, you can only use larger forging equipment for forging, and then go through heat treatment and other ......."

"That's hundreds of tons, heat treatment ......" Xie Kai felt terrible when he thought of the heat treatment of such a large part.

Heat treatment, which involves heating the entire part, makes the metal crystal structure inside the part fine.

But it is too difficult to heat such a large size and keep it warm for a long time.

Once the heating is uneven, it will eventually cause the whole product to be heated unevenly, and the internal metallographic structure will be very different, if the force is not large, the problem will not be too prominent.

However, the working pressure of the large press is 45,000 tons, and the main girder not only has to bear the working pressure of tens of thousands of tons, but also needs to bear the pressure generated by the heavy thousands of tons of parts and molds connected to the main girder.

The internal structure is inconsistent, and the final result is that the stress is concentrated in the parts of the coarse grain structure, which are very large and constantly stressed, and under the accumulation of force, it will eventually cause the internal coarse grain structure to detach, resulting in cracks, which will lead to the final fracture......

"This process is equivalent to quenching and tempering. Ordinary castings are produced, poured in molds, and the molten steel inside is gradually cooled. This cooling process is actually from the outside in. The outer mold is in contact with the air, dissipating heat, and the cooling is completed first, and then the temperature of the molten steel inside is transferred and gradually cooled...... So, in the casting process, the outer position, the finer the grain structure becomes......" Chu Guorong then explained.

Xie Kai understands all these theories.

The problem is that by controlling the temperature around the casting, can the current problem be solved?

"So, this time it will prolong the cooling process of the whole casting?" Xie Kai somewhat understood why. "Can it be useful to use this kind of soil method? The outside temperature and the inside temperature are uncontrollable. In particular, the temperature inside the casting ......"

Because to understand, in knowing how difficult it is.

"It's not uncontrollable. According to our many tests and calculations, the outside temperature is directly related to the internal temperature of the casting. In order to control this temperature, we have built a mathematical model. Once it is successful, no matter what other large castings are used, there is no problem!" Chen Mingshan said proudly, "In the future, when you come to our college, you will be able to get in touch with this mathematical model." ”

He thought that this model would have a great attraction for Xie Kai.

However, Xie Kai just looked at him and smiled.

"Although the method is dirty, there are a lot of things involved in it, so it took so long to start casting again this time. "Shen Hong, as the Minister of Industry like an open hanger, also attaches great importance to this matter. "Slowing down the cooling rate and trying to keep the temperature of the inner center of the casting as close as possible to the outside can refine the grain structure and improve the mechanical properties......"

Dana, who has presided over the design of nine complete sets of industrial equipment in China, attaches great importance to the large press, and does not mean to take it lightly.

Xie Kai nodded and didn't say anything more.

The whole project is a very big challenge, there is no precedent in China, and there is no foreign experience to learn from, and such an approach is absolutely impossible to choose in the international arena.

The exact result will only be known when the final casting is formed.

Even if it is Minister Shen Hong, Chu Guorong and other masters, no one dares to guarantee that the current process will be successful.

Experience is all accumulated.

Many things, even if you know the process, the details are a little surprising, and they will cause immeasurable results.

"Hopefully there will be no problems this time, many of our projects are waiting for the big press. Zheng Yucheng sighed and said with a worried face, "According to the previous progress, now the main girder has been processed and is ready for installation." ”

"There's no way around it. It wasn't well thought out before. This time, I paid too much tuition. Minister Shen Hong was also a little painful.

The double person is even more painful.

The scrapped one, selling scrap iron can still sell for hundreds of thousands, but the cost of production, electricity costs, molds, etc., all have to be paid by them.

"Yes, also because of financial problems, many of our production schedules have been seriously affected. Jiang Ming looked at Zheng Yucheng and complained, "Director Zheng, I don't know if you can ...... over there."

"Don't even think about it. We only have a big press on our budget. If you want to continue with the next 65,000 or 80,000 tons of presses, follow the contract. Besides, isn't the Ichiju side also responsible for the loss? Zheng Yucheng directly blocked Jiang Ming's words.

This project is jointly carried out by the first and second heavy and dozens of other state-owned units, with a fund of 200 million yuan to build a 45,000-ton die forging machine.

In China, it is already the largest project of a single equipment.

"The first weight is only partially undertaken, and most of it is borne by the double weight. Nowadays, there is not a lot of double business. Shen Hong also spoke.

They wanted 404 to cover some of the costs.

The whole project was too difficult and there was no experience to draw on.

It is completely concentrated on the largest strength of the whole country to tackle key problems, and in terms of funding, it is much higher than the original budget.

"Minister Shen, if this continues, we will not be able to cooperate in the future, and no matter how we need it, we will not be able to invest in large presses. Xie Kai said dissatisfiedly, it stands to reason that Shen Hong should not help Erzhong and other units to speak.

Shen Hong looked at Xie Kai with interest and didn't speak.

Waiting for Xie Kai to continue.

"We invested in the construction of large presses, and each unit undertook the business, and in the process, we challenged their existing technical systems and cultivated their internal skills...... At the end of the day, it's all about the technology...... When we purchase large presses, we give enough costs, and the excess costs generated in the process of their own experiments are not in line with the principles of market economy if we bear them...... "Xie Kai said.

The meaning is very clear, each unit took the construction funds of 404 to improve its own technical level, and finally caused losses due to its own reasons in the process, and it was impossible for 404 to pay.

404 funding cannot be used to support the development of the entire system.

The improvement of the technical level has to be borne by each other, and 404 is only the purchaser.

"In addition, according to what we know, the units responsible for each core component and system are all subsidized by the Ministry of Finance, right?" Zheng Yucheng asked.

It's hard for everyone to talk about it.

The large press project, because the technical level was too poor, the demand for funds was huge, and the national funds were in short supply, so it was finally discontinued.

404 contributed money to pick up this project, and the state did not give a penny, but provided funds for each core unit in the form of project subsidies.

For the same project, the participating units received two grants.

"There isn't much state subsidy. Jiang Ming said.

"We spent 200 million yuan on this project, and the state didn't give us a penny of subsidies!" Zheng Yucheng said dissatisfied. "This equipment is not for our family. ”

"Okay, Comrade Yucheng, everyone has difficulties, let's understand each other. It's almost time, so get ready to light the fire and warm it up. Shen Hong was afraid that everyone would fall out, so he hurriedly persuaded him.

The 404 system was very unhappy with the delay in the progress of the large press.

But the main beam of the entire large press is the key key.

The column used to support the entire weight is made easier by the use of steel wire winding prestressed bonding technology mentioned by Xie Kai.

The 45,000-ton press is even just a chance to practice!

"Now start ignition?" Xie Kai asked, "Has all the molten steel in the furnace melted?"

"It's been ready for a long time. It will take a long time to wait until the temperature of the mold rises. Chu Guorong said.

With an ignition order, natural gas flames began to emerge from the carbon trough around the mold......

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