Chapter 505: Die forging press, project restarted!
Originally, the people Chang Haonan planned to meet today were all seniors who had been designing 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 the original expectations.
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 research and development of die forging presses.
But if it is to be truly 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 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 with everyone.
But in this situation, how could he possibly object to Chang Haonan's intention?
So after only a moment's hesitation, he announced to the more than 100 people present that the meeting would be adjourned temporarily so that he could go back and collect necessary items such as paper, pens, and computers.
Everyone in the arms industry had been reminded of the importance of this opportunity a few days ago. Although they were a little surprised by such a fast progress, they also stood up one after another and followed Zhang Yong's request. Leave the venue quickly.
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:
"It still has to be in the military industry. The big brother of the system... Look at his fighting power..."
Although he didn't continue, he obviously remembered what happened to this 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.
The later data was obviously destroyed deliberately by someone, which explains some problems...
Hearing others praise the military industry system, Zhang Yong, who is one of them, is naturally proud.
But Chang Haonan is by his side, and it is not his turn to be in a state of admiration 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 pressure. It says it is a cooperative participation, but in fact it wants to learn from you... I hope that Mr. Chang, Professor Yan and other comrades will not hesitate to give 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 "study" was Chang Haonan. They just happened to be present, so they were added behind, so they were not included. No 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 does have this idea.
Although the scope of his research in the past 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 at the technical level...
However, Chang Haonan himself can say that Zhang Yong must not take it seriously, and he immediately said solemnly:
"Mr. Chang, although these comrades are participating in the research and development project of the die forging press, I still want to trouble you if you have the conditions. You can give me some advice in various aspects..."
"In recent years, the above-mentioned regulations on state-owned enterprises have been greatly improved. The attitude is to grasp the big and let go of the small, but in fact there has never been a clear definition of what is big and what is small. It is all explored by everyone in the operation. "
"Now in the aviation industry, even Guizhou Airlines. Enterprises of that size have been pulled out and have become positive examples of the market-oriented reform of state-owned enterprises. The pressure on our arms industry is indeed great. Several major head offices will carry out group reforms early next year. At this moment, time is already very tight. Already..."
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 three areas of business, the weapons industry, the nuclear industry, and the military-to-civilian transition.
Due to policy reasons, the nuclear industry cannot develop 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 hot commodity more than ten years ago, but now it is the late 1990s. All those who should have been transferred have already been transferred, and the bonus period has long passed.
The weapons industry is the only one left that can be operated.
But the main business of the weapons industry is ground equipment and construction machinery.
Military and civilian applications are included.
Although it doesn’t sound too high-end, it’s just a low threshold. It’s not easy to do well.
Even, 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.
Have you ever seen that even helicopters made in India can be exported? But the weapons industry does not even have this condition.
Already one step behind, and now being pulled further and further away, Zhang Yong must be getting angry.
"Don't worry, I know a lot about this."
Chang Haonan is already very familiar with this method of play. It would be better to say that this is the way of cooperation he expected:
"The aviation industry , I am working on a new generation of aviation development, 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 I 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.
A few 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 of 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."
Yan Yongnian, after all I have been a professor at Qinghua University for more than 20 years. Once I start teaching, even if I am just sitting in my seat, my whole temperament changes suddenly:
“Now, I will directly start from the basics of the die forging press. The principle begins..."
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 learned in junior high school physics. Two closed chambers filled with working fluid and equipped with plungers or pistons are connected by pipelines.”
"When a 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 hydraulic machine body structure Picture."
"..."
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 about 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 The current main problem with this plan is that the stress distribution of the steel wire winding layer is difficult to be uniform, and the requirements for manufacturing and assembly accuracy are extremely high..."
The introduction ended, but it was the same as what Chang Haonan had learned before. Nine is inseparable from ten.
Just added more content on some details.
“Professor Yan.”
Chang Haonan wrote 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 winding structure, the unevenness of the stress in the winding layer should be similar to that of the frame structure. , that is, the span between the upper and lower arched beams is positively correlated, and the larger the span, the higher the alignment requirements for the arched beams.”
“From this point of view, this structure should be more suitable. Small and medium-sized presses with low pressure, so why did you choose this route for an equipment of nearly 70,000 tons? "
"Is this..."
Yan Yongnian was quoted by Chang Haonan? The reporter was stunned by such a quick reaction, 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 likely to occur between the movable beam and the workbench under unbalanced load. "
"This is still the case for 10,000 tons. If the 68,000-ton press still adopts this structure, the problem will only get worse. It's serious and cannot be put into normal production at all."
Chang Haonan lowered his head and thought for a moment, going over the relevant knowledge he had read before in his mind:
"What about the plate-frame combination structure? The 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 frame, but found that the structure is complicated and there are many connections. , the effective area of the frame is greatly weakened, and in the multi-body modeling process, the processing of redundant constraints and prestressing is extremely complex, completely beyond our theoretical level at the time.”
Speaking of this, Yan Yongnian showed some regret:
“Let alone production and manufacturing, even the design work has just started, and there is no way to continue.”
However, After hearing this explanation, Chang Haonan's eyes lit up -
What he was worried about was actually the difficulties in production and processing, as well as materials and technology, which were 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 who was not far away:
“So, I think we can try to use the board and frame combination structure again!”
(End of this chapter)