Chapter 526: Laying out the Industrial Control Field
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 10 based on the test data of Turbofan 9A.
Because the goal is to lower the total 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 fan and high-pressure compressor of the turbofan engine 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, they are not difficult to process. 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 dimensions: profile and wall thickness. Constraints make it difficult to improve production efficiency and yield.
An excellent chief designer cannot just focus on the things on his desk, but must consider the optimization of the production and manufacturing process in 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. It is considered to be the current technical condition in my country. ”
“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 large blades. Problems such as deformation, low shape consistency, and uneven machining allowances. The use of abrasive belt grinding at the back end 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 here, 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 the master, but if you replace it with automated equipment, you must have Only by accurately measuring the blade profile before grinding and then comparing it with the processing target can the grinding process indicators be determined.
Especially for hollow turbine blades, because they are hollow inside, there is also the issue of wall thickness detection.
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 Restricted equipment..."
The Wassenaar Agreement is not mandatory in theory. 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 nowadays...
“As for wall thickness detection, we use our own developed technology.”
Speaking of which , 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 It's like the CT used in hospitals..." Chang Haonan had a vague impression after hearing what the other party said.
When he first came to the 410 Factory to inspect the production of the turbojet 14 more than a year ago, Zhong Shihong mentioned such a thing.
Only 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, which is 3D printing. In today's context of the late 1990s, it was basically impossible to do any research, so I didn't get involved at that time.
Unexpectedly, flowers blossom inside the wall and fragrant 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 process of reporting to superiors, after the achievements have been discussed, the next step is naturally to talk about the difficulties:
“The problem we are currently facing is mainly the difficulty in determining the material removal rate of abrasive belt grinding. Making precise predictions results in unstable abrasive belt grinding efficiency. Grinding can only be carried out in sections, and then tested after each section. "
"Hard grinding... this belongs to the microscopic molecular level. The research direction 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 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, there is no need to pursue a The accuracy of two molecules..."
Chang Haonan was stunned for a moment, and then 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 removal volume of a single abrasive grain can be combined to derive the total effective local abrasive cutting Volume, and assuming that the total volume removed by the abrasive particles is equal to the material loss of the rail surface cuboid micro-elements, the grinding depth model on any grinding path can be established..."
Zhong Shihong's eyes gradually became clear and transparent. .
“In short, the purpose of studying micro is to guide the process technology in the macro sense. Due to random and irregular movement at the molecular level, the calculation accuracy will be very poor, but at the macro level, because of the principle of large numbers, this kind of irregular movement The impact of the rules is negligible..."
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 questions, he would only become more confused, so he just nodded.
Anyway, he is responsible for managing production and manufacturing, so he does not 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 Beijing in about two days. I will try my best to prioritize this issue by then. It is best to integrate it into the industrial control system so that the grinding process only needs to be set once. It can be completed in two times..."
Chang Haonan actually didn't have this idea at first, but halfway through the sentence, 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. After all, it needs to expand business scope.
Industrial control software and industrial control computers are obviously a good breakthrough point.
He was reborn a little late, and I am not an expert in the field of electronic technology. 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 can be regarded as promising.
(End of this chapter)