Shocked to shocked, Chang Haonan quickly realized that being able to ask for his opinion on such a very important personnel appointment was definitely a high degree of trust in himself by the organization.

Although Ding Gaoheng said that he was going to let Lan Xinzhi take charge of the Equipment Industry Department, the leaders of the second-level bureaus of ministries and commissions generally do not belong to the central management sequence.

But this is not an ordinary job transfer, but a new department leadership position that has been spawned in a round of large-scale organizational adjustments.

Moreover, this new department is also the focus of multi-directional confrontation.

It is definitely not that the director of the Commission of Science and Technology can make a decision casually.

Including coming to Zhiqiu to ask his opinion on the candidate, I'm afraid it's not, or at least it's not just Ding Gaoheng's meaning.

"Okay, I'll get the results out before the conference."

Chang Haonan replied.

After determining this matter involving the appointment of the organization, Ding Gaoheng's expression also relaxed a lot.

In fact, it is indeed not entirely his intention to ask Chang Haonan for advice on the matter of selecting the leader of the Equipment Industry Department.

However, the instructions of the superiors on this are also relatively vague, only mentioning that "attention should be paid to soliciting the opinions of some core technical personnel in the appointment of key positions".

Chang Haonan's name did not appear directly.

So just now Ding Gaoheng was a little entangled before he spoke.

After all, the matter of institutional adjustment and reform does have a bit of a sense of walking on thin ice.

Now that I have said that, I don't have so many worries.

Of course, on the other hand, Chang Haonan's multifaceted reliability and age-appropriate maturity have been proven by himself many times in the past two years.

In particular, through the Boeing-McDonnell Douglas merger and acquisition, almost the entire civil aviation industry in China has been revitalized.

To put it bluntly, he has promoted the aviation industry in the last two years more than in the past two decades.

It's a visionary.

Then, it is reasonable to believe that the same person, in the field of machinery industry, even if he cannot create the same miracle, at least it will not be too bad.

This is also an important reason why Ding Gaoheng finally decided to speak.

Of course, those forces that want to obstruct the development of Huaxia's industry cannot rest on their laurels.

Aviation and mechanical engineering, after all, are two related but parallel industries.

Always taking out past results as bargaining chips, it seems a little unconvincing.

It's better to be able to do something new.

"Xiao Chang, you tell me the truth."

Ding Gaoheng resumed his relaxed sitting posture, but did not move on to other topics:

"When is your plan to complete this die forging press and put it into production?"

"I need to determine how much resources to allocate to the Equipment Industry Division in the next two years according to your timetable."

Although the Commission of Science and Technology has too many powers in its hands than before, the power and responsibility are unified, and there are many more places where it costs money, or even a lot of money.

For example, the aviation industrial park that has been determined in Luzhou accounts for a lot of this year's funding.

The manufacturing industry is a typical high-investment, long-cycle industry, and it is impossible to see the money back in one or two years.

Therefore, in terms of funds, not to mention the tightness, at least not to the extent of deep pockets.

When it came to this, Chang Haonan thought about it a little and decided to give the truth.

After all, this also affects the amount of resources that the die forging press can obtain once it enters the production process.

"If the resources are sufficient, our first priority plan is to strive for the equipment to be put into production before October '99, which can be regarded as a gift for the 50th anniversary of the National Day."

To be honest, the National Day gift has both a formalistic side and a morale-boosting side.

However, in the dark stage before the dawn of 1999, it is clear that the latter is still more preferred.

In this era, China really needs confidence.

In the last life, during the National Day parade in 99, not only did the missiles that had just been tested and not yet finalized be pulled out to support the scene, but even the imported S300 air defense missiles were hardly installed with the name of Red Flag 15, pretending to have been put on the production line like Project 11.

At one time, it really had the effect of being fake.

So much so that even more than twenty years later, there are still relevant urban legends.

In this context, if the heavy-duty die forging press, which is a large country with few units in the world, can really be put into production, it will definitely be regarded as a first-class model effect.

Not to mention the economic benefits that come by the way.

Ding Gaoheng's hand that just picked up the thermos cup shook a little.

Rao is that he had already made sufficient mental preparations before, and he never expected that the time node set by Chang Haonan would be before the new century.

Ding Gaoheng, who barely suppressed the shock in his heart and kept the surface calm and breezy, gave up drinking water, put the cup back on the table, and quietly wiped the water that had just been spilled on his shirt:

"50th Anniversary Gift...... It's a good name, if it can be done, it will definitely be great good news for us, especially for the Equipment Industry Division, and it can also block many people's mouths. ”

Speaking of which, perhaps because he was worried about putting too much pressure on Chang Haonan, he changed his words again:

"However, this time node is a bit too exaggerated, and I won't talk about it for the time being, so don't put too much pressure on your side, and ensure the smooth operation of the project and the reliability of the equipment is the first priority."

"That'...... Resource ...... of the Equipment Industry Division"

Chang Haonan asked tentatively.

"Just configure it according to the time node you said, on the premise of ensuring that the basic business of other departments is not affected, as long as our science and technology commission system can get it, all will be called by you first!"

Ding Gaoheng made a judgment between the electric light and flint -

Strengthen the investment in die forging presses, worth!

That's all for the important things.

He originally wanted to stay with Chang Haonan for lunch, but when he thought of the other party's recent work arrangement, he decided to put it aside for the time being.

Ding Gaoheng looked at the back of Chang Haonan who was about to go out, and suddenly stopped him, and added:

"Regarding Secretary Lan's affairs, just report to me directly, and you don't need to submit written materials."

"Understood."

……

Similar to the situation on the side of the turbofan 10, the design scheme of the die forging press cannot be completely determined at one time.

After the overall R&D route is determined, there are still many specific technical details that need to be optimized.

And Chang Hao's technical seminar in Nankai is also to solve these problems.

"Mr. Chang, according to the method you instructed before, we have completed the model construction and meshing of the overall frame of the forging press, and the static analysis of the equipment is also very smooth, and no problems have been found."

Yan Yongnian stood on the podium of the small conference room, pointed to the PPT on the curtain and introduced to Chang Haonan, who was sitting at the head of the conference table:

"As you emphasized before, the first ten natural frequencies of the forging press are 0.40618, 0.43178, 0.64196 ......"

"We consulted the data of the same type of die forging press abroad and found that the frequency in the working state is around 0.3, and there is no resonance risk......"

"Wait a minute."

At this point, Chang Haonan suddenly raised his hand and motioned for Yan Yongnian to pause first:

"Of course, it's no problem to refer to mature foreign data for analysis, but at this work frequency, it shouldn't be difficult for us to calculate it ourselves, right?"

"Although I don't have any problem with the 0.3 number, there are some things that are better done on your own."

In the face of Chang Haonan's question, the full professor of Qinghua University, who is nearly 50 years old, felt a sense of oppression for the first time.

He raised his hand to wipe the non-existent sweat on his forehead, and then explained weakly:

"That's the problem we're facing right now."

"After the static calculations, the original plan was to calculate the stress distribution of the individual structural components in the working state, but we found it difficult to perform a force analysis of the local composite load-bearing structure."

"Our meshing was done with hexahedral elements on the TORCH Multiphysics software, but during the calculation, the calculated local stresses were always too high, which on the one hand showed the uneven transfer of force flow between the composite load-bearing members, and on the other hand, it also showed that the deformation between the contacts was uncoordinated......"

"Considering that fatigue failure is the main cause of failure of heavy equipment, this problem must be quite fatal, if not solved, it is easy to lead to the parts that are in contact with each other after being subjected to load, and cause fatal damage to the equipment......"

"Therefore, we must first complete the optimization design, and then start to calculate the dynamic data in the working state, otherwise the calculated results will be meaningless......"

In fact, if you can determine the specific location of the problem in such a short period of time according to your previous work habits, it can be said to be quite a good achievement.

But in Chang Haonan's case, Yan Yongnian explained to the end, and he was nervous.

"Parts in contact with each other ...... seams"

Chang Haonan looked at the equivalent force diagram of the C-shaped plate and the cross key on Yan Yongnian's PPT, lowered his head and wrote it down on the paper in front of him.

"In other words, there should be a problem with the modeling of the interference joint structure?"

Yan Yongnian and the other subsystem leaders looked at each other, and then nodded one after another:

"It should be that the contact between the various parts of the die forging press is a three-dimensional contact problem, and there is uncertainty in the mechanical condition of the contact surface, we have tried to use the test-error method for conventional iteration, but the calculation efficiency is very low, not to mention the convergence is still ......"

Obviously, they thought and tried.

It's just a failure.

Chang Haonan stared at the computer screen, which was the setting program for Yan Yongnian and the others to calculate.

If the stress is not concentrated, if it is a manufacturing problem, if it is a design problem, it is definitely a huge hidden danger.

After a period of silence, Lin Qingsong, who was seconded from the Northern Vehicle Research Institute, explained again:

"This is one of the most difficult problems in the whole design plan, and if the next meeting can always bring a solution, the efficiency of the later optimization part should be very fast."

"Nope."

Chang Haonan still didn't look up, just waved his hand:

"No need for another meeting."

"This question...... There are basically four solutions, and as for which one to use, you can evaluate it yourself. ”

"Huh?"

Just now, Lin Qingsong, who just wanted to find a step for Yan Yongnian, was stupid.

These are not the four ways to write the Chinese characters, as long as you look at the book, you can know, and it is not really useful.

The problem of cracking of weak points caused by uneven stress distribution is a huge problem not only in China but also in the world.

In general, if the impact is not particularly large, you can only grit your teeth and replace parts more frequently.

Anyway, fatigue damage is not unusable, it is nothing more than a life problem.

And if the impact is great, then there is generally only targeted reinforcement.

Including Lin Qingsong's own job, heavy-duty vehicle design, also faced a similar situation.

Each time it takes years, if not longer, to test and solve slowly.

As a result, Chang Haonan came up with four solutions......

Chang Haonan motioned for Yan Yongnian to return to his seat first, and then walked to the podium by himself, picked up a whip and pointed at the equipment model on the curtain:

"In the working state, a small closed-loop force loop is formed in the upper part of the forging press by the C-shaped plate, the cross key, the large tie rod and the clamping beam. During the forging process, the force generated by the hydraulic cylinder acts on the upper plate beam and then transmits to the C-plate, which is successively transmitted to the tie rod, the clamping beam through the cross key, and finally back to the C-plate. ”

"Therefore, the most important part of this is the coordination between the D-pad and the C-plate, and the contact state between the two will not only affect the characteristics of the flow transmission, but also affect the deformation of the whole machine in all directions."

"So the point is that there is a relatively gentle transition in the composite structure, so that the stress and deformation can be transmitted smoothly and harmoniously."

At this point, he turned his head and looked at the dozen or so people sitting below:

"To this point, approval?"

Everyone's reactions were quick and slow, but most of them nodded their heads to show that they understood.

"Well, the corresponding solution is."

Chang Haonan pulled the blackboard next to him and picked up a piece of chalk:

"First, it is possible to set an uneven interference without changing the shape of any component, so that the strength of the component itself is not weakened, and as for the specific method, TORCH Multiphysics provides a function called 'bonding', which can glue two parts with different meshes together......"

"In this, as long as the interference amount is set to meet Δ(min)=pd(C1/E1+C2/E2)*10^3, where E1 and E2 are the elastic modulus of the contained part and the contained part material, respectively......"

"Second, based on the force flow analysis I just conducted, the contact surface between the D-pad and the C-plate was reshaped to reduce the displacement of the two parts under pressure......

"Thirdly, the opening problem just mentioned is actually because the preload and the reaction force of the main cylinder produce an additional moment, and the lower part of the wedge key can be considered to be repaired into a shape with a certain inclination to balance this additional moment......"

"The idea of the fourth method is similar to that of the third, but by changing the structure of the component to achieve ......"

On the stage, Chang Haonan's thinking became more and more transparent.

In the audience, everyone also followed his train of thought and worked hard to write.

Of course, if you write and write, you can only write hard.

The idea can only go back and slowly reminisce.

It wasn't until the blackboard was filled with two sides that Chang Haonan could explain the four solutions that he had just thought of temporarily.

He looked back, wanting to ask what everyone thought.

But looking at it or frowning and thinking, or looking at it with a blank expression, this question was not asked after all.

There are some things that are rude to say.

Fortunately, the people who can sit here will not be ordinary people.

I couldn't keep up with the train of thought for a while, just because he spoke too fast and jumpy, not because he really couldn't understand it completely.

Go back and review it a little more, and you'll always understand.

"Mr. Chang, why are you so skilled......

A slightly younger technician looked at his notebook in front of him and let out a long sigh.

Chang Haonan naturally couldn't directly say that I opened the hanging, so he had to reply after holding it for a long time:

"Maybe it's because I designed TORCH Multiphysics......"

(End of chapter)