Chapter 505 Die Forging Press, Project Restarted!

Originally, the people Chang Haonan planned to meet today were all seniors who had been engaged in the design of die forging presses more than ten years ago. They were actually more familiar with the situation than he was, and they could get straight to the point.

But with so many helpers suddenly added, the situation deviated somewhat from what was originally expected.

Although these people should also be experts in structure and machinery, they can only be said to have mastered the necessary basic knowledge and generally meet the needs of the development of die forging presses.

But if it is to be truly implemented in project development, after all, there are still very few people like Chang Haonan who can seamlessly switch between different research directions.

Therefore, it is necessary to give an overall overview of the entire project.

Zhang Yong next to him thought that today he would just clarify the specific participation of each unit in the project, but he did not expect that Chang Haonan would directly increase the intensity on the first day he met everyone.

But in this situation, how could he object to Chang Haonan's intention?

Therefore, after only a moment's hesitation, he announced to the more than 100 people present that the meeting would be temporarily adjourned so that he could go back and collect necessary items such as paper, pens, and computers.

Many people in the weapons industry had already been reminded of the importance of this opportunity a few days ago. Although they were a little surprised by the rapid progress, they all got up and left the venue quickly in accordance with Zhang Yong's request.

The huge small auditorium quickly returned to peace.

Yan Yongnian, who was sitting at the long table closest to Chang Haonan, watched the crowd leave neatly from the door, and sighed with emotion:

"He must be the big brother of the military-industrial system... Look at his combat power..."

Although he didn't continue talking, he obviously remembered what happened to the die forging press back then.

If there could be a little more unity within the machinery industry system back then, and Mr. Shen Hong would not be squeezed out, this project might not have been abandoned halfway.

And later, it was obvious that someone deliberately destroyed the data, which explains some problems...

Hearing others praise the military industry system, Zhang Yong, as one of them, felt proud.

But Chang Haonan is by his side, so it's not his turn to be carefree anyway.

What's more, my family members know their own affairs and they are also facing their own difficulties.

"Professor Yan doesn't have to say that."

Zhang Yong scratched his hair in distress:

"The weapons industry system is so active this time because it feels the pressure. It says it is a cooperative participation, but in fact it is to learn from your side... I also hope that Mr. Chang, Professor Yan and other comrades will not hesitate to provide guidance..."

Now that there are only a few core members present, some topics that were inconvenient to talk about just now can be discussed.

After so many years of ups and downs, Yan Yongnian naturally knew that the main target of this so-called "learning" was Chang Haonan. They just happened to be present, so they were added behind, so they did not reply.

"Learn from each other and make progress together..."

Chang Haonan just picked up the tea cup and quickly waved his hand to Zhang Yong and said.

On the one hand, he needs to be modest in order to save his face. On the other hand, he really has this idea.

Although the scope of his past research was generally broad, it was basically limited to things flying in the sky.

The main business of the Ordnance Industry Group, including this heavy-duty die forging press, should be regarded as "running on the ground."

Although they remain the same, there are still some differences.

Besides, this "progress" does not necessarily have to be technical...

However, Chang Haonan himself could say that Zhang Yong could not take it seriously. He immediately said solemnly:

"Mr. Chang, although these comrades are participating in the research and development project of the die forging press, I would still like to trouble you if you have the conditions to give me some advice in various aspects..."

"In recent years, the attitude towards state-owned enterprises has been to focus on the large and let go of the small. However, there has never been a clear definition of what constitutes a large state-owned enterprise and what constitutes a small one. Everyone is left to figure out their own operations."

"Now in the aviation industry, even enterprises of the size of Guizhou Airlines have been pulled out, and they have become a positive example of the market-oriented reform of state-owned enterprises. The pressure on our arms industry is indeed great. Several major companies will start grouping early next year. Reform, at this moment, time is very urgent..."

In fact, Zhang Yong had no choice but to choose to turn to Chang Haonan for help.

The Second Department of Systems Engineering is responsible for the three areas of business: weapons industry, nuclear industry, and military-to-civilian conversion.

Due to policy reasons, the nuclear industry cannot develop just as you want. Although there is no performance pressure, it is impossible to achieve any results in a short period of time.

Converting the military to civilians was indeed a popular option more than ten years ago, but now it is the late 1990s, and those who should have been transferred have already been transferred, and the bonus period has long passed.

Only the weapons industry is left to operate.

But the main business of the weapons industry is ground equipment and construction machinery.

Both military and civilian use are included.

Although it doesn't sound too high-end, it's just a low threshold. It's not easy to do well.

In fact, because the threshold is low and not too sensitive, many countries that are not competitive in fields such as aerospace can actually point out their expertise in this area.

For example, Germany, Italy, Sweden, Japan and even South Korea are all strong competitors.

Even before Chang Haonan was born, the aerospace and even shipbuilding industries could still play a cost-effective role.

After all, these things are still a seller's market. As long as you can get the things out, you don't have to worry about selling them.

Didn’t you realize that even helicopters made in India can be exported?

But the weapons industry does not even have this condition.

He was already one step behind, but now he is being pulled further and further away. Zhang Yong must be getting angry in a hurry.

"Don't worry, I know a lot about this."

Chang Haonan is already very familiar with this gameplay. It would be better to say that this is the way of cooperation he expected:

"In the aviation industry, I am working on a new generation of aviation engines, which is actually a similar idea."

The original intention of this sentence is just to stabilize Zhang Yong's mentality, but I have to say that it is a bit Versailles.

So he got a complicated look from Zhang Yong, like looking at a monster.

While a few people were chatting, people No. 100 who had just left to get supplies for the meeting also returned to the small auditorium one after another.

Several people ended the topic in a tacit understanding.

The first technical seminar on the research and development of die forging presses officially started.

…

The basic knowledge about die forging presses and past research experiences were naturally introduced by Yan Yongnian, who knew the situation best.

"You are all experienced researchers in the field of military research. I will not say more about the significance of hot forging technology and heavy-duty die forging presses to the national economy and industrial production."

After all, Yan Yongnian has been a professor at Qinghua University for more than 20 years. Once he starts teaching, even if he is just sitting in his seat, his whole temperament changes suddenly:

"Next, I'll start directly from the basic principles of the die forging press..."

Following his introduction, two schematic diagrams were released on the curtain of the small auditorium.

"The basic principle of a hydraulic press is Pascal's principle, which I learned in junior high school physics. Two closed chambers filled with working fluid and equipped with plungers or pistons are connected by pipes."

"When force F1 acts on the plunger, an upward force F2 that is much greater than F1 will be generated on the large plunger, causing the workpiece to deform."

"The picture on the right is the simplest structural diagram of the hydraulic press body."

"..."

The first part is obvious knowledge to people here, so Yan Yongnian just brushed it off.

Soon, the content of his narrative entered the part of past research experience.

"In the late 1980s, under the leadership of Academician Shen Hong, we designed a 68,000-ton heavy-duty forging hydraulic press. The main body adopts a prestressed steel wire winding structure. The frame is composed of upper and lower arch beams and columns. It is connected by steel wire ropes. They are intertwined..."

"Because the research at that time was stopped midway, and some key technical data were later lost, so now, after we have sorted out the remaining data, we have concluded that the main problem with this plan is the stress distribution of the steel wire winding layer. It is difficult to make it uniform, and the requirements for manufacturing and assembly accuracy are extremely high..."

At the end of the introduction, the situation was very similar to what Chang Haonan had learned before.

Just added some more details.

"Professor Yan."

Chang Haonan finished writing the last stroke in his notebook, then raised his head:

"I just did some calculations in my head. In this kind of prestressed steel wire wound structure, the unevenness of the stress in the winding layer should be positively correlated with the frame structure, that is, the span between the upper and lower arched beams. And the larger the span, the better the span. The alignment requirements for arched beams are also higher.”

"From this point of view, this structure should be more suitable for small and medium-sized presses with lower pressure, so why did you choose this route for an equipment of nearly 70,000 tons?"

"Is this..."

Yan Yongnian was stunned by Chang Haonan's quick reaction. He turned his head and looked back and explained:

"We originally planned to continue the three-beam and four-column structure of the 10,000-ton hydraulic press, but this structure was not able to withstand eccentric loads. During the use of old equipment, we found that the eccentricity under the maximum load can generally reach 100% of the maximum span. Third, tilt and horizontal displacement are prone to occur between the movable beam and the workbench under eccentric load."

"This is still a 10,000-ton situation. If the 68,000-ton press still uses this structure, the problem will only become more serious and it will not be able to be put into normal production at all."

Chang Haonan lowered his head and thought for a moment, going through the relevant knowledge he had read before in his mind:

"What about the plate and frame combination structure? I remember that the Soviet Union's 75,000-ton press, including the 65,000-ton die forging press exported by the Soviet Union to France, should have this structure."

"We have also tried this kind of rack, but found that the structure is complex, there are many connections, and the effective area of ​​the rack is greatly weakened. Moreover, in the multi-body modeling process, the processing of redundant constraints and prestressing is extremely complicated, which is completely beyond the scope. Our theoretical level at that time.”

Speaking of this, Yan Yongnian showed some regret:

"Not to mention production and manufacturing, even design work has just started, but it can't continue at all."

However, after hearing this explanation, Chang Haonan's eyes lit up——

What he is worried about is actually the difficulties in production, processing, and material technology, which are difficult for him to deal with in a short time.

"If the difficulty lies in multi-body dynamics analysis, this is exactly the part I am good at..."

He looked at Yan Yongnian not far away:

“So, I think we can try again with board and frame construction!”