Originally, the few people Chang Haonan planned to meet today were old-timers who had been engaged in the design of die forging presses since more than ten years ago, and they were actually more familiar with the situation than him, so they could go directly to the topic.

But all of a sudden, with so many helpers, the situation is a little different from what was originally expected.

Although these people should also be experts in structure and mechanics, they can only be said to have mastered the necessary basic knowledge and meet the needs of die forging press research and development on a large scale.

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

Therefore, it is necessary to give a general overview of the whole project.

Zhang Yong next to him thought that today was just to clarify the specific participation of each unit in the project, but he didn't expect Chang Haonan to go directly to the intensity on the first day of meeting with everyone.

But in this scene now, how could he object to Chang Haonan's intentions?

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 they could go back to get paper, pen, computer and other necessary items.

The people on the side of the ordnance industry had already been reminded of the importance of this opportunity a few days ago, although they were also a little surprised by such a fast progress, they also got up one after another and quickly left the venue according to Zhang Yong's request.

The large small auditorium was soon restored to its cleanliness.

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

"It has to be the big brother of the military industrial system...... Look at the combat power of other people......"

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

If the machinery industry system of that year could be a little more united, so as not to squeeze out the old man Shen Hong, this project may not be abandoned halfway.

The fact that the data damage was obviously deliberate on the part of someone is even more telling......

Hearing others praise the military industrial system, Zhang Yong, as one of them, is naturally honored.

But Chang Haonan was by his side, and it was not his turn to flutter no matter what.

What's more, their own 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 with some distress:

"The Ordnance Industry System is so active this time, but also because it feels the pressure, and it is said that it is cooperative participation, but in fact, it is to learn from your side...... I also hope that President Chang, Professor Yan and other comrades will give guidance to ......"

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

Yan Yongnian has experienced so many years of ups and downs, and naturally knows that the object of this so-called "learning from the scriptures" is mainly Chang Haonan, but they just happened to be there, so they were added to the back by the way, so they did not reply.

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

Chang Haonan just picked up the teacup, and hurriedly waved his hand to Zhang Yong and said.

On the one hand, he still has to be modest anyway, and on the other hand, he does have such thoughts.

Although the scope of his research in the past was generally wide, it was basically limited to what flew 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 everything is the same, there is still a little difference.

Besides, this "progress" doesn't have to be technical......

However, this kind of words, Chang Haonan himself can say that Zhang Yong must not take it seriously, and immediately said with a solemn face:

"Mr. Chang, although this group of comrades is involved in the research and development project of die forging presses, I still bother you to give you guidance in all aspects if you have the conditions......

"In recent years, the above attitude towards state-owned enterprises is to grasp the big and let go of the small, but how to be big and how to be small, in fact, there has not been a clear definition, everyone is groping for themselves in the operation."

"Now the aviation industry, even the scale of Guihang enterprises have been pulled out, as a positive example of the market-oriented reform of state-owned enterprises, our ordnance industry is indeed under great pressure, at the beginning of next year several major head offices will carry out group reform, now at this juncture, the time has been very short......

In fact, choosing to turn to Chang Haonan for help, it is true that Zhang Yong has nothing to do.

The Second Department of Systems Engineering is in charge of three aspects of business, the weapons industry, the nuclear industry, and the military-to-civilian conversion industry.

Due to policy reasons, the nuclear industry does not develop if you want to, and although there is no performance pressure, it is impossible to achieve any results in a short period of time.

More than ten years ago, the military was indeed a fragrant bait, but now it is the end of the 90s, and everything that should be transferred has already been transferred, and the bonus period has long passed.

Only the only seedling left in the weapons industry can be operated.

However, the main business of the ordnance industry is ground equipment and construction machinery.

Both military and civilian are included.

Although it doesn't sound too lofty, it's just a low threshold, and it's not easy to do a good job.

Even, because the threshold is low and not very sensitive, many countries that are not competitive in fields such as aerospace can point out their specialization in this area.

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

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

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

You don't see that even Indian-made helicopters can be exported.

But the weapons industry does not even have this condition.

was already one step slower, but now that he is being pulled farther and farther away, Zhang Yong must be in a hurry.

"Don't worry, I've got you covered."

Chang Haonan is already very familiar with this set of gameplay, but it is better to say that this is the way he expects to cooperate:

"On the aviation industry, I am engaged in a new generation of aviation development, in fact, it is a similar idea."

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

So he got Zhang Yong's eyes as complicated as a monster.

In the midst of the small talk of several people, the 100 people who had just left to go back to pick up the conference supplies also returned to the small hall one after another.

Several people ended the topic very tacitly.

The first technical seminar on the research and development of die forging press officially began.

……

The basic knowledge of the die forging press, as well as the past research experience, was naturally introduced by Yan Yongnian, who knew the most about the situation.

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

After all, Yan Yongnian has been a professor at Qinghua University for more than 20 years, and once he starts teaching, even if he just sits in place, his whole temperament changes suddenly:

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

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

"The basic principle of the hydraulic press is the Pascal principle, which I learned in junior high school physics, and two closed cavities filled with working fluid with plungers or pistons are connected by pipes."

"When the plunger acts on the force F1, the large plunger will produce an upward force F2 that is much greater than F1, which will deform the workpiece."

"The picture on the right is the simplest structure of the hydraulic press."

“……”

The initial part is obvious knowledge to the people here, so Yan Yongnian is just passing it off.

Soon, his story moved on to his previous research experience.

"At the end of the 80s, under the leadership of Academician Shen Hong, we designed a 68,000-ton heavy-duty die forging hydraulic press, the body adopts a prestressed steel wire winding structure, and the frame is composed of upper and lower arch beams and columns, and they are wound together by wire ropes......

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

At the end of the introduction, it was inseparable from what Chang Haonan had learned before.

Just added more on some details.

"Professor Yan."

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

"I just calculated that the unevenness of the stress of the winding layer should be positively correlated with the frame structure, that is, the span between the upper and lower arch beams, and the larger the span, the higher the alignment requirements for the arch beams."

"In this way, this structure should be more suitable for small and medium-sized presses with lower pressures, so why did you choose this route for a nearly 70,000-ton machine in the first place?"

"What ...... this?"

Yan Yongnian was stunned by Chang Haonan's quick response, turned his head to look back, and explained:

"We originally planned to continue the three-beam four-column structure of the 10,000-ton hydraulic press, but the structure can not bear eccentric load capacity, in the process of using the old equipment, it is found that the eccentricity under the maximum load can generally reach three percent of the maximum span, and the movable beam and the workbench are prone to tilt and horizontal displacement under eccentric load."

"This is still a situation of 10,000 tons, if the 68,000-ton press still uses this structure, the problem will only be more serious, and it will not be able to be put into production normally."

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

"What about the board-frame structure? I remember that 75,000 tons of Soviet presses, including 65,000 tons of die forging presses exported by the USSR to France, should have been of this construction. ”

"We also tried this kind of rack, but found that the structure was complex, there were many connections, the effective area of the rack was greatly weakened, and in the process of multi-body modeling, the handling of redundant constraints and prestresses was extremely complex, which was completely beyond our theoretical level at that time."

Speaking of this, Yan Yongnian showed some regrets:

"Not to mention manufacturing, even the design work has started, and it can't go on at all."

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

What he worries about is actually the difficulties in production and processing, as well as the material process, which are difficult for him to deal with in a short period of time.

"If the difficulty is in multibody dynamics analysis, this is exactly what I am good at......"

He looked at Yan Yongnian not far away:

"So, I think we can try again with a board-and-frame combination structure!"

(End of chapter)