The military-industrial scientific research system of the academic master.

What happened at the Singapore Air Show has not yet had any impact on Chang Haonan, who is in Shengjing.

In the next more than half a month, he was completing, refining and revising the high-pressure compressor design of Turbofan 9 based on the test data of Turbofan 10A.

Because the goal is to lower the overall boost ratio of the compressor, this certainly does not present any difficulty for Chang Haonan, who almost mastered the overall design plan.

In addition to ensuring supersonic performance, lowering the stage pressure ratio also brings another layer of benefits.

The bearing and gear samples provided by Fuzhou Bearing Group have a longer life than expected. Reducing the ultimate working intensity of the compressor will also help improve the overall overhaul interval and life of the entire engine.

For the Turbofan 10 project, the difficulty still lies in manufacturing.

Although the fans and high-pressure compressors of turbofan engines are not considered hot-end components and have relatively low operating temperatures, as long as they involve aerospace engines, especially parts involving aerospace engine core engines, the processing difficulty is not low.

In order to reduce the weight of the blade, the fan blade will adopt a weakly rigid hollow structure. However, the hollow blank often has large errors. In addition, the product has a large twisted profile, and there are two constraints: profile and wall thickness, resulting in production efficiency. It is difficult to improve the quality and yield rate.

An excellent chief designer cannot just focus on the things on his desk, but must consider the optimization of the manufacturing process during the initial design process.

Therefore, Chang Haonan spent a considerable part of his time in the 410 Factory.

"Mr. Chang, we have recently upgraded a batch of equipment. The front-end manufacturing process uses superplastic forming and diffusion connection, and the back-end process uses CNC milling and abrasive belt polishing. Under the current technical conditions in my country, we have achieved great results in terms of processing efficiency and The balance point found between machining accuracy.”

“The production efficiency of the superplastic forming process is very high, but because it involves multiple high-pressure and high-temperature cycles, it can easily lead to problems such as large blade deformation, low shape consistency, and uneven processing margins. However, when using the back-end Abrasive belt grinding can accurately remove excess material and is more efficient than manual grinding..."

Zhong Shihong followed Chang Haonan and introduced to Chang Haonan while walking past the production equipment being debugged.

When Chang Haonan came over, he could only visit, but now it is considered an inspection.

"Abrasive belt automatic grinding... Then how do you do blade profile inspection?"

Manual grinding can rely on the experience and intuition of masters, but if you switch to automated equipment, you must have a way to accurately measure the blade profile before grinding, and then compare it with the processing target to determine the grinding process indicators.

In particular, hollow turbine blades also involve wall thickness detection issues because they are hollow inside.

Chang Haonan must determine the processing capabilities of the 410 factory in order to determine the design style of the internal hollow cavity and truss structure.

Although the internal conditions of the blades will not affect the performance of the compressor itself, if the actual mass distribution of the blades is very different from the original design, it will affect the dynamic balance of the blades and thus affect the service life.

"The outer contour inspection uses a three-dimensional coordinate detector. We cannot make this thing with such high accuracy ourselves for the time being. However, in previous cooperation with the European Union, they bypassed the Wassenaar Agreement and exported a batch of functions to us that are not subject to Limited equipment..."

The Wassenaar Agreement is theoretically non-enforceable. Member states can decide on their own whether to issue export licenses for sensitive products and technologies. It is actually not difficult to circumvent it.

Especially now that the EU is at its peak, decisions made unanimously by several member states are unlikely to be blocked.

On the contrary, as the number of future EU member states increases, it will be easy for one or two small countries to be controlled and add sand to the EU.

As for money...

European products are indeed expensive.

However, the only disadvantage of expensive things is that they are expensive.

Fortunately, Factory 410 is indeed not short of money these days...

"As for wall thickness detection, we use technology developed by ourselves."

Having said this, Zhong Shihong turned around and pointed at the two devices placed not far away:

"There is an engineer in our factory who has studied the repair and remanufacturing technology of damaged blades for many years. Although the specific method of repair has not been fully understood, he has developed a wall thickness detector based on ultrasonic principles based on CNC machine tools, just like Like the CT used in hospitals..."

Hearing what the other party said, Chang Haonan had a vague impression.

More than a year ago, when he first came to the 410 Factory to inspect the production of the turbojet 14, Zhong Shihong mentioned such a thing.

But firstly, Chang Haonan’s attention was entirely on the turbojet 14, and there was really no extra energy. Secondly, the core of the damage repair and remanufacturing technology is actually additive manufacturing, that is, 3D printing. In the late 90s, Basic research on the background didn't yield anything, so I didn't get involved at the time.

Unexpectedly, the flowers blooming inside the wall will bloom outside the wall. Although the original research content did not achieve any results, it has gained a lot in other aspects.

Of course, in fact, quite a few technological breakthroughs come from this.

According to the standard reporting process to superiors, after the achievements have been discussed, the next step is to discuss the difficulties:

“The main problem we are currently facing is that it is difficult to accurately estimate the material removal rate of abrasive belt grinding, which results in unstable abrasive belt grinding efficiency. We can only perform segmented grinding, and then inspect it after each segment is completed. "

"Hard grinding... This belongs to the research direction of microscopic molecular weight. It is indeed not what I am good at now..."

Chang Haonan thought about it for a while and found that this was indeed his knowledge blind spot.

Although everything remains true to its origins, at least we have to go back and learn some knowledge of molecular microdynamics.

"Molecular weight..."

This time, Zhong Shihong was stunned:

"Mr. Chang, we are engaged in mechanical processing, so there is no need to pursue an accuracy of one or two molecules..."

Chang Haonan was stunned and immediately realized that the other party had misunderstood what he meant.

"The purpose of studying molecular dynamics is not to improve the accuracy to the molecular level. That is of course impossible..."

"Theoretically, the total volume of local effective abrasive cutting can be derived by combining the material removal volume of a single abrasive particle. Then assuming that the total abrasive particle removal volume is equal to the material loss of the rail surface cuboid micro-element, any grinding path can be established. Grinding depth model..."

Zhong Shihong's eyes gradually became clear and transparent.

"In short, the purpose of studying the micro is to guide the process technology in the macro sense. Due to random and irregular motion at the molecular level, the calculation accuracy will be very poor, but at the macro level, due to the principle of large numbers, the impact of this irregularity can be ignored. Excluding……"

Chang Haonan summed it up directly.

In fact, Zhong Shihong still didn't understand, but he was quite self-aware and knew that even if he continued to ask questions, he would only become more confused, so he just nodded.

Anyway, he is responsible for managing production and manufacturing, so he really doesn't have to understand the specific technical details.

Those who kill fish do not necessarily need to be able to forge knives.

"I will return to the capital in about two days. I will try my best to prioritize this issue at that time. It is best to integrate it into the industrial control system so that the grinding process only needs to be set once or twice to complete it. …”

Chang Haonan didn't actually have this idea at first, but halfway through talking, he suddenly remembered Wei Yongming, who he had met several times before.

Judging by the time, the other party should be graduating from graduate school soon, and he can be recruited into the Torch Group by then.

Although Chang Haonan's plan for the company is to focus on light assets and intellectual assets, and follow the route of technical cooperation and intellectual property accumulation, it is impossible to just focus on the product TORCH Multiphysics. It is necessary to expand the scope of business.

Industrial control software and industrial control computers are obviously a good breakthrough point.

It was a bit late for him to be reborn, and I am not an expert in the field of electronic technology. It is a bit late to start to seize the desktop market. However, the industrial field has not yet formed a strong monopoly relationship like that of later generations, so there is great potential.