What happened at the Singapore Airshow has not had any impact on Chang Haonan, who is in Shengjing, for the time being.

In the next half month, he was complete, refined and revised the design scheme of the high-pressure compressor of the turbofan 10 according to the test data of the turbofan 9A.

Because the goal is to reduce the total pressure boost ratio of the compressor, this is of course not difficult for Chang Haonan, who is almost single-handedly in charge of the overall design plan.

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

The life of the bearing and gear samples provided by Fuzhou Bearing Group exceeded expectations, and reducing the ultimate working intensity of the compressor was also conducive to improving the overall overhaul interval and life of the entire engine.

For the turbofan 10 project, the difficulty is still in the manufacturing.

Although the fan and high-pressure compressor of the turbofan engine are not considered hot-end components and the working temperature is relatively low, as long as they involve aviation engine, especially the parts of the aviation engine core machine, the processing difficulty is not low.

In order to reduce the weight of the blades, the fan blades will adopt a weakly rigid hollow structure, but the hollow blank often has a large error, coupled with the large twisted surface of the product, and there are two constraints of profile and wall thickness, which makes it difficult to improve the production efficiency and yield rate.

An excellent chief designer cannot only care about the things on his desk, but must take into account the optimization of the production and manufacturing process in the initial design process.

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

"Mr. Chang, we have recently upgraded a number of equipment, the front-end manufacturing process adopts superplastic forming and diffusion connection, and the back-end process adopts CNC milling and abrasive belt polishing, which is considered to be the balance between processing efficiency and machining accuracy under the current technical conditions in China."

"The production efficiency of the superplastic forming process is very high, but because it involves multiple high-pressure, high-temperature cycles, it is easy to lead to problems such as large deformation of the blades, low shape consistency, and uneven machining allowance......

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

Back then, Chang Haonan could only call for a visit, but now it can be regarded as an inspection.

"Automatic grinding of abrasive belts...... So how do you do blade profile inspection? ”

Manual grinding can rely on the experience and intuition of the master, 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 machining target to determine the grinding process indicators.

In particular, hollow turbine blades are empty inside, so they also involve the problem of wall thickness detection.

Chang Haonan must determine the processing capacity of the 410 factory in order to correspondingly 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 lifespan.

"The outer contour detection is a three-coordinate detector, which we can't make with such high accuracy for the time being, but before cooperating with the European Union, they bypassed the Wassenaar Agreement and exported a batch of equipment with unlimited functions to us......"

The Wassenaar Agreement is theoretically not enforceable, and member states can decide whether or not to issue export licenses for sensitive products and technologies, which is practically not difficult.

Especially now that the European Union is in full swing, the unanimous decisions of several member states are unlikely to be blocked.

On the contrary, when there are more and more EU member states in the future, it is easy to be controlled by one or two small countries and mix sand into them.

As for the money......

European goods are indeed expensive.

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

Fortunately, the 410 factory is indeed not too bad for money now......

"As for the wall thickness inspection, we use our own developed technology."

Speaking of this, Zhong Shihong turned around and pointed to the two devices that were 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 repair has not been studied, but combined with CNC machine tools, a wall thickness detector based on the principle of ultrasonic has been made, just like CT used in hospitals......

Hearing what the other party said, Chang Haonan vaguely had an impression.

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

It's just that Chang Haonan's attention was completely on the turbojet 14 at that time, and there was really no extra energy, and secondly, the core of the damage repair and remanufacturing technology was actually additive manufacturing, that is, 3D printing, and in the context of the late 90s, the basic research could not be one, two, three, so there was no intervention at that time.

I didn't expect the flowers to bloom inside the wall and the fragrance outside the wall, although the original research content did not achieve any results, but in other aspects of the harvest is not small.

Of course, in fact, a considerable number of technological breakthroughs have come this way.

According to the standard process of reporting to the superior, the results are finished, and the next step is naturally to talk about the difficulties:

"At present, the main problem we are facing is that it is difficult to accurately estimate the material removal rate of abrasive belt grinding, resulting in unstable belt grinding efficiency, and we can only grind in sections, and then take it for testing after each section."

"Hard grinding...... This is a research direction at the microscopic molecular weight level, and it is really not what I am good at now......"

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

Although everything is changing, at least we have to go back and learn about molecular microdynamics.

"Molecular weight ......"

This calmed Zhong Shihong:

"Mr. Chang, if we are engaged in machining, there is no need to pursue the accuracy of one or two molecules......

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

"Studying molecular dynamics is not about improving the precision to the molecular weight level, so of course it can't ......."

"Theoretically, the total volume of local effective abrasive grain cutting can be derived by the removal volume of a single abrasive material, and then the grinding depth model on any grinding path can be established by assuming that the total abrasive grain removal volume is equal to the material loss of the rectangular element on the rail surface......"

Zhong Shihong's eyes gradually became clear and transparent.

"In short, the study of the micro level is ultimately to guide the process technology in the macro sense, the calculation accuracy at the molecular level will be very poor due to random irregular motion, but at the macro level, because of the principle of large numbers, the influence of this irregular can be ignored......

Chang Haonan simply 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, he would only become more incomprehensible, so he nodded.

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

You don't necessarily need to be able to forge a knife to kill a fish.

"I will be back in the capital in about two days, and when the time comes, try to raise the priority of this problem, and it is best to get it into the industrial control system, so that this grinding process only needs to be set once or twice to complete......"

At first, Chang Haonan didn't have this idea, but halfway through speaking, he suddenly remembered Wei Yongming, who had had a few encounters with him before.

According to the time, the other party should be about to graduate from graduate school, and he can be recruited to the Torch Group at that time.

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

And industrial control software and industrial control computer are obviously a good breakthrough point.

He was reborn a little late, and he is not an expert in the field of electronic technology, so it is a little late to start seizing the desktop market, but the industrial field has not yet formed a strong monopoly relationship like that of later generations, which is promising.

(End of chapter)