"That's right, Three Gorges."

Jin Gui nodded:

"According to the plan, the current first phase of 14 units will be purchased from Voith and Siemens in Germany, General Electric in the United States, Alstom in France and ABB in Switzerland, and the second batch will begin to consider digestion and absorption technology for localization."

"But the factory still thinks that this thing can't just think about waiting to be relied on, the relationship between Big Brother and us back then looked at Duotie, and in the end, it didn't depend on everyone to go, not to mention these foreign companies now.

So we started to try to study some key technologies by ourselves a few years ago, and at first we were just thinking about doing pre-research, so that we can have some confidence when we engage in localization bidding later, at least we won't be like a fool when others play tricks. ”

"But then we did it, we found that at present, in addition to the bearing part of the complete lack of technical reserves to be imported, the rest seems to be able to try to do it themselves, just the factory in the past two years of benefits are OK, on the approval of a fund to pull the project up."

After hearing this, Chang Haonan couldn't help but feel a little admired:

"That's ...... so"

Bearings, especially ball and roller bearings for China is indeed a big problem, in the previous life when the North Heavy Industry engaged in large-size shield machines, the main bearing was also the last by the North Heavy Industry, the Institute of Metals of the Chinese Academy of Sciences and the new strong alliance of several units to overcome.

Therefore, it is not easy to make other parts of the ultra-high-power hydropower unit famous in the 90s.

Jin Gui, who was sitting opposite, continued:

"So far, the overall progress is not bad, but the two pieces just mentioned are really not something that we can solve by a single factory, and we need to do the overall planning by the superior department."

Of course, Chang Haonan knows that large forgings and lathes are difficult points in the equipment manufacturing industry, but he is still ready to listen to more specific statements from industry insiders.

"Is this difficult?"

He knows how to hook up the topic later, not to mention that the person he is talking to is a person who has a strong desire to speak, so he doesn't have to bother at all.

However, this time, the other party did not give an answer immediately as he did in the past few hours, but lowered his head and pondered for a while, so that Chang Haonan thought that this question was more sensitive.

"It's hard, or rather, not exactly hard."

Jin Gui unscrewed the lid of the thermos cup and took a sip:

"Since you are engaged in airplanes, you should also understand that a thing is only medium-sized and the easiest to make, whether you want to be very large or small, the difficulty is very high, just like the Boeing 747 is definitely much more difficult to build than the Y-5."

"The turbine end cover we want to build, as well as the runner hub, the finished products are nearly 100 tons, especially the runner, because it has to directly withstand the impact of the water flow, the strength of the hub is very high, and because it works in the water, it also uses martensitic stainless steel ......."

"In short, it can't be made like a blacksmith striking iron through repeated processing many times, it must be made with a large enough equipment, a forging form, this equipment is very complex, involving many different disciplines and fields, must rely on the Ministry of Machinery Industry This level of departments, the integration of national resources is possible."

Chang Haonan nodded knowingly.

In fact, it is the same as the Nikolaev shipyard could not complete the Varyag aircraft carrier on its own.

Fortunately, there are still objective conditions on the Huaxia side.

It's just that the research funds in various fields are not rich nowadays, and if you want to engage in such a high-investment project in the early stage, you must come up with some sufficient reasons and go to the top for special approval.

"Big enough...... How old does that have to be? ”

This question is not that Chang Haonan is pretending to be stupid, but that he really wants to know more, so that he can go to Ding Gaoheng for a project later:

"I think those aircraft factories make landing gear and other parts, and they also use super-large forging equipment, isn't that enough?"

Jin Gui shook his head decisively:

"It's not enough, what you are talking about should be the 30,000-ton die forging press in our country, or another 12,000-ton free forging press, all of which are unique seedlings."

Although he is the head of the supply and marketing department, Jin Gui can be regarded as a treasure when he talks about these things:

"If you want to talk about it, the 30,000-ton machine is already one of the 15 most powerful die forging presses in the world, like Germany and the United Kingdom, which is on the same level as us, but it is far from enough to build the wheel we designed."

"30,000 tons is not enough?"

Chang Haonan saw on the news that Huaxia had the world's largest 80,000-ton die forging press before his rebirth, but he really didn't expect that there would be 30,000 tons in the 90s.

"It's not enough, if you want to make it, you have to ...... at least"

When he said this, he suddenly paused, leaned back in his chair and thought for a few seconds:

"At least 50,000 tons of this level, if you leave some margin, it is more safe, I am afraid you have to start with 60,000 tons."

"60,000 tons ......"

Chang Haonan secretly wrote down this number, and at the same time, he was somewhat uncertain in his heart.

The 80,000-ton die forging press was put into trial production in 2013.

As Jin Gui just said, there are too many fields involved in large-scale equipment, and the equipment manufacturing industry is a very accumulating industry, and I am afraid that it will be replicated in the current situation...... Hard.

"Now we only have 30,000 tons, then this is doubled, in our aircraft field, if the maximum take-off weight is doubled, the technical difficulty is quite remarkable, our country's current foundation ......"

"Is this...... I don't dare to pack a 100% ticket. ”

Jin Gui gently touched his chin:

"But I know that at the end of the 80s, Qinghua University designed a 65,000-ton heavy-duty die forging press, and had done a lot of production preparations, but it was stopped halfway through."

"I don't know exactly what the specific situation is, but at least the related technologies, such as pressure cylinders, pressure storage cylinders, and drive motors, must have been pre-researched, in short, the technology in this area is definitely not a blank, otherwise we would not have had an idea from the beginning."

This is definitely a huge surprise for Chang Haonan.

The heavy-duty forging press can carry out hot die forging and isothermal superplastic forming of difficult-to-form materials such as aluminum alloy, titanium alloy, high-temperature alloy, and powder alloy, so it is very widely used and can play a role in almost all industrial fields such as nuclear energy, petrochemical industry, and shipbuilding.

And, of course, aerospace.

For example, the manufacture of large aircraft landing gear, fuselage load-bearing frame, landing gear, large rocket forging ring, etc.

Once it is made, it can be used for tens or hundreds of years, which is definitely a merit in the present and a benefit in the future.

After getting the information he wanted, Chang Haonan quietly chatted with Jin Gui about other more relaxed topics, but he was already thinking about how to implement this big project.

Although he has made considerable contributions in the past six months or so, and has been registered with the director of the Commission of Science and Technology, it is impossible to make a decision in a sentence like this kind of big work that can be said to involve the entire manufacturing field, not to mention him, even Du Yishan and even Ding Gaoheng himself.

Not to mention, feasibility demonstration, and cost recovery cycle are always things to do.

The only good news is that due to the influence of Chang Haonan himself, the current domestic large aircraft project should not die as in the previous life with the merger and acquisition of McDonnell Douglas, and the planned model is also likely to be upgraded from the 70-ton class of the MD90 to the 100-ton class of the Tu-214.

Therefore, after this heavy-duty forging press is made, it can ensure that it will be used continuously, so that it will not be idle after building a few hydropower unit parts.

But that's not enough.

At least not enough insurance.

(End of chapter)