Seeing that Xiao Liu was frowning and didn't know how to start a metallographic analysis and inspection, Yang Jinquan smiled and said, "How to check, I have a solution. Mr. Li said it on the phone just now."

Xiao Liu said in surprise: "Director Yang, Mr. Li also understands the matter of Jin Xiang's analysis and inspection. It's amazing."

Yang Jinquan smiled and a look of admiration appeared on his face. Li Tianfeng often came to the metallographic analysis room. Yang Jinquan knew that Li Tianfeng had a deep technical attainments and a wide range of knowledge, so he couldn't help but say: "Xiao Liu, Mr. Li's technical level is very high. He not only knows materials, design and craftsmanship, but also knows metallographic analysis of materials."

Xiao Liu nodded in admiration.

Yang Jinquan said: "Xiao Liu, go and take the two turbine guide blades over, and I will teach you how to conduct metallographic inspections."

After thinking about it, Yang Jinquan said, "Forget it, I will check it myself and take the leaves over. You can watch it from the side and learn it and see how I check it."

Xiao Liu quickly took the two blades, and Yang Jinquan personally conducted metallographic analysis and inspection of the two turbine guide blades.

In the office.

After Li Tianfeng called and knew that the two turbine guide blades had not been cut and sampled for metallographic analysis and inspection, he felt a little relieved. Just wait a moment and the inspection results were ready. As long as the metallographic inspection of these two blades was qualified, Li Tianfeng was ready to use these two blades to install the two blades on his third prototype.

Of course, it is definitely fake if there is no worry. Li Tianfeng is slightly worried that he is afraid of what happens. Although he is confident in his manufacturing process, he is afraid of everything. If the metallographic analysis and inspection fail, the problem will be big.

Li Tianfeng knew that dozens of turbine guide blades were produced in the same batch. If these two turbine guide blades were not qualified, the remaining blades in the same batch must be unqualified. Because they were manufactured in the same batch and with the same process methods and process parameters, either all metallographic analysis and inspection were passed or all unqualified.

The inspection results will take a certain amount of time, so Li Tianfeng could only wait and sit at his desk. After reading a few documents, he turned on the computer and started to look at some important design drawings of the "ts003" engine. But after looking at it for a while, Li Tianfeng found that he really couldn't concentrate. Li Tianfeng knew that he was still worried and afraid that the metallographic analysis inspection would fail.

Coincidentally, Sun Kang knocked in and came in. Sun Kang must have been worried about the assembly of the third prototype, because the assembly of this engine still lacks three parts.

"Brother-in-law, you're here."

Seeing Sun Kang come in, Li Tianfeng got up and greeted him, and personally made a cup of tea to serve Sun Kang.

After Sun Kang sat down, he thought for a while and said, "What I worry most about is the two turbine guide blades that are missing. If this kind of turbine guide blade is to be re-filled, I just thought and calculated it carefully. Even if we organize it carefully, it will take 12 days at the earliest when 24-hour three shifts. If there is any problem in the production, it may take 15 days."

It takes 12 to 15 days to re-load the turbine guide blades. In addition, after the blades are produced, the engine assembly will be carried out, which will take a few more days. The third verification machine will be assembled to the test run, which will take nearly 20 days.

Li Tianfeng said: "Brother-in-law, it is definitely impossible for our third verification machine to wait for so long. I have already had some clues about the two turbine guide blades that are missing. Maybe there is no need to re-filling and re-production."

"Oh." Sun Kang's eyes lit up, and he asked, "Tianfeng, what are you doing?"

Li Tianfeng said: "Didn't we produce dozens of these turbine guide blades in a recent batch? Two of them are in the metallographic analysis room and have not yet been destructively sampled. We can use these two turbine guide blades."

Hearing this, Sun Kang was happy that it would be best if he didn't have to re-invest the materials and work 24 hours a day for production. So Sun Kang said: "If this blade can be used, it will solve the big problem, just..."

Li Tianfeng understood the reason why Sun Kang was hesitant, and Li Tianfeng said: "Brother-in-law, you are worried that some of the sizes of these two turbine guide blades are not qualified, right!"

Sun Kang said: "I'm just worried about this. Our third prototype is used for field test flight verification. If you install these two unqualified turbine guide blades, I'm worried about problems with the engine."

Li Tianfeng smiled: "It won't have such a big impact. In addition, before these two turbine blades are installed and used, we must conduct strict non-conforming quality reviews."

The pass rate of aviation engine parts production and manufacturing is definitely not 100%, and Tianfeng Technology Company cannot do this. Tianfeng Technology's pass rate of parts is only relatively high, but it has not reached 100%. I believe that any aviation industry enterprise cannot reach this level.

If the pass rate of parts is less than 100%, there will always be a small number of parts with quality problems of one kind or another. What to do and how to deal with these parts cannot be decided by one person, but must undergo strict unqualified quality review.

Tianfeng Technology Company has a failed product committee, and Li Tianfeng also serves as the director of the committee. Several deputy directors are military representatives, airworthiness representatives, as well as Sun Xiaoping, Qiu Wen'an, Zeng Qinghai and others. In addition, there are backbone of various technical fields below, with dozens of members of the entire committee.

If the parts are not qualified, the relevant procedures will be handled first by an authorized inspection technician. If it is a minor failure and is a general part, the inspection technician has the right to handle it. The handling opinions are "received as is", "rework", "degraded use" or "scrapped".

Some of the excess errors are relatively serious or the excess errors of key and important parts are generally unable to handle, so they will be submitted to the unqualified product committee for processing.

The unqualified product committee is divided into first-level trials and second-level trials. If the first-level trials are not accurate and cannot be handled, it is generally submitted to second-level trials. If the second-level trials are heard, several deputy directors will definitely participate. If Li Tianfeng has time, he will also participate.

Second-level trials generally deal with the excessive review of some key and important parts. After the second-level trials, the final use opinions of the parts are given.

In Li Tianfeng's memory, when he was in the e-factory, the first-level trial was basically held three or four times a week, and the second-level trial was at least once a week, sometimes twice.

Tianfeng Technology Company has a relatively high pass rate in parts processing and good quality. Such unqualified quality review meetings are generally held relatively few.

When Sun Kang saw Li Tianfeng say this, the parts can be reviewed for unqualified quality, Sun Kang was a little relieved, but Li Tianfeng's words made Sun Kang's whole heart suffocate again.

Li Tianfeng said: "Brother-in-law, what I am most worried about now is the metallographic analysis and inspection results of these two turbine guide blades. If the metallographic analysis and inspection of these two blades fail, then the matter will be very big."

Upon hearing this, Sun Kang's face changed slightly, "Tianfeng, if such a situation really happens, it will be really difficult. Then we must re-invest materials and re-production and manufacturing."

Li Tianfeng said: "I hope this will not happen."

The two of them were talking about work in the office and also talked about the assembly of these two prototypes. Time passed by one minute.

"Dingling..."

On Li Tianfeng's desk, the phone ringing suddenly rang. Li Tianfeng had a premonition that this should be a call from the Metallurgy Analysis Room.

Sure enough, when he saw the caller ID, it was the office landline number of the Metallurgical Analysis Room. Li Tianfeng picked up the phone and said loudly: "Hello, I am Li Tianfeng."

Yang Jinquan's voice came from the phone, and it was obviously a bit happy. "Mr. Li, the metallographic analysis and inspection results have come out. The metallographic inspection of these two turbine guide blades is completely qualified. According to your inspection method, these two blades are intact."

Li Tianfeng was overjoyed, and a high-hanging heart finally came to an end and said happily: "Okay, okay, great, Director Yang, thank you for your hard work."

Li Tianfeng barely put down the phone, and Sun Kang also asked happily: "Tianfeng, the metallographic examination result is qualified?"

Li Tianfeng nodded and said, "The inspection results are completely qualified, and after the metallographic analysis and inspection of these two turbine guide blades, the blades themselves are intact."

Sun Kang was also very happy, "Tianfeng, it's so good!"

Li Tianfeng also smiled happily and thought to himself that as long as you conduct another unqualified quality review, you can review these two blades with slightly unqualified sizes.

………

Tianfeng Technology Company, a conference room.

Li Tianfeng was decisive in his work. On the afternoon of the metallographic inspection of these two turbine guide blades, a review meeting for the failure products was held in this conference room, focusing on the deliberation of these two turbine guide blades.

These two turbine guide blades are placed on the conference table. For everyone to see the appearance of the blades, the metallographic analysis and inspection report is also placed next to it. In front of the conference room, the projector projected the unqualified size in front of everyone.

Both blades have an installation size of one that exceeds the difference, with a design requirement of 25±0.05. In fact, one piece is 24.91 and the other piece is 24.93. The excess difference is not serious.

However, even if it is not serious, it is still a poor and is unqualified. Everyone needs to review and come up with opinions on whether it can be used or cannot be used.

Li Tianfeng attended and presided over the meeting. Just now, Li Tianfeng has introduced the basic situation of these two blades, and everyone has also seen the excess size difference projected by the projector.

It was everyone's turn to speak and express their opinions. One of the airworthiness representatives looked at one of the leaves and said: "Mr. Li, I personally only agree to use one of the leaves. The size of the other one is 24.91, and the difference is 4 wires. I think the difference is a bit large."

Only one of the pieces was agreed to use, and the assembly of the third prototype was still missing one turbine guide blade, and it was still impossible to assembly.

…………
Chapter completed!