Seeing Xiao Liu's sad face and not knowing how to start the metallographic analysis and inspection, Yang Jinquan smiled and said: "How to conduct the inspection, I have a way, Mr. Li has said it on the phone just now." ”

Xiao Liu said in surprise: "Director Yang, Mr. Li also understands the matter of metallographic analysis and inspection, which is really amazing." ”

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

Xiao Liu also nodded in admiration.

Yang Jinquan said: "Xiao Liu, go and bring the two turbine guide blades, and I will teach you how to perform metallographic inspection." ”

After thinking about it, Yang Jinquan said: "Forget it, I'll check it myself, go and bring the leaves, you watch from the side, learn it, and see how I check it." ”

Xiao Liu quickly went to take these two blades, and Yang Jinquan personally conducted metallographic analysis and inspection of these two turbine guide blades.

In the office.

After Li Tianfeng made the call, he knew that the two turbine guide blades had not been cut and sampled for metallographic analysis and inspection, and he was a little relieved, as long as he waited, the inspection results came out, as long as the metallographic inspection of these two blades was qualified, Li Tianfeng was ready to use these two blades and install these two blades on his third prototype.

Of course, there is no worry that it must be fake, Li Tianfeng is slightly worried that he is afraid of what if, although he is more confident in his own manufacturing process, but he is afraid of everything in case, in case the metallographic analysis and inspection is unqualified, then the problem will be big.

Li Tianfeng knew. This batch of turbine guide blades has been manufactured in the same batch of dozens of pieces, these two turbine guide blades are unqualified, then the rest of the blades of the same batch must also be unqualified, because it is the same batch, the same process method and process parameters are manufactured, or the metallographic analysis and inspection are all qualified. Either all are unqualified.

It will take a certain amount of time for the inspection results to come out, Li Tianfeng can only wait, sit at the desk, read a few papers, turn on the computer again, and start to look at some important design drawings of the "TFWS003" 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 in his heart, afraid that the metallographic analysis and inspection would be unqualified.

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

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

Seeing Sun Kang come in, Li Tianfeng got up and said hello. personally brewed a cup of tea and served it to Sun Kang.

After Sun Kang sat down, he thought for a while and said, "Tianfeng." When assembling the third prototype, I was most worried about the two turbine guide vanes that were missing, and if the turbine guide vanes were to be re-fed for production, I had just carefully considered and calculated, even if we had carefully organized them. 24 hours of three-shift production, the fastest is 12 days, if there is any problem in the middle of production, it may take 15 days. ”

It takes 12 to 15 days for the turbine guide vanes to be re-fed for production, plus after the blades have been produced. It will take several days to complete the final assembly of the engine, and the final assembly of the third demonstration machine will be completed, and it will take nearly 20 days to reach the test run.

Li Tianfeng said: "Brother-in-law, it is definitely impossible for our third verification machine to wait so long, and I already have a little eyebrows for the two turbine guide blades that are missing, and I may not need to re-feed and re-manufacture." ”

"Oh." Sun Kang's eyes lit up, and then asked, "Tianfeng, what good can you do." ”

Li Tianfeng said: "In the latest batch, didn't we produce dozens of these turbine guide vanes, two of which are in the metallographic analysis room, and no destructive sampling has been carried out, and these two turbine guide vanes can be used by us." ”

Hearing this, Sun Kang was happy, and there was no need to re-feed the material for 24 hours and three shifts for production, which was the best, so Sun Kang said: "If this leaf can be used, it will solve the big problem, but it is ......."

Li Tianfeng understood the reason for Sun Kang's hesitation, and Li Tianfeng said: "Brother-in-law, you are worried about the unqualified size of these two turbine guide blades, right?" ”

Sun Kang said: "I am worried about this, our third prototype is used for field test flight verification, with such two unqualified turbine guide blades, I am worried that there will be 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 have to conduct a strict review of unqualified products." ”

Aero engine parts manufacturing, the pass rate is certainly not 100 percent, Tianfeng Technology Company can not do this, Tianfeng Technology parts pass rate is only relatively high, but it has not reached 100 percent, I believe that any aviation industry enterprise can not reach such a process.

The pass rate of parts is not 100%, there will always be a small number of parts with such and such quality problems, what to do with these parts, how to deal with them, this can not be a certain person has the final say, but to go through a strict review of unqualified products.

Tianfeng Technology Co., Ltd. has a nonconforming product committee, Li Tianfeng is also 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 backbones in various technical fields below, and the entire committee members reach dozens of people.

If it is a slight unqualified, it is a general part, and the inspection technician has the right to deal with it, and the processing opinion is "received as is", "rework", "downgraded use" or "scrapped".

Some out-of-tolerances are relatively strict, or the out-of-tolerances of key and important parts are generally unable to be handled by inspection technicians, so they are submitted to the non-conforming products committee for processing.

The nonconforming products committee is divided into first-level trial and second-level trial. The first-level trial is not accurate, and the situation that cannot be handled is generally submitted to the second-level trial, and if the second-level trial is conducted, several deputy directors will definitely participate, and if Li Tianfeng is free, he will also participate.

The second-level trial generally deals with the out-of-tolerance trial of some key and important parts, and after the second-level trial, the final use opinion of the parts is given.

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

Tianfeng Technology Co., Ltd.'s parts processing pass rate is relatively high, the quality of parts is good, such unqualified product review meetings are generally held relatively rarely.

Sun Kang saw Li Tianfeng say this, and the parts could be reviewed for unqualified products, Sun Kang was a little relieved, but Li Tianfeng's words hung Sun Kang's whole heart 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 vanes. ”

Hearing this, Sun Kang's face changed slightly, "Tianfeng, if such a situation really occurs, it is really very tricky, then we must re-feed and re-manufacture." ”

Li Tianfeng said: "I hope there will not be such a situation." ”

The two were in the office, chatting about work and the assembly of the two prototypes, and the time passed minute by minute.

"Jingle Bell ......"

On Li Tianfeng's desk, the phone rang suddenly, and Li Tianfeng had a hunch that this should be a call from the metallographic analysis room.

Sure enough, when I looked at the caller ID, it was the office landline number of the metallographic analysis room, Li Tianfeng picked up the phone and said loudly: "Hello, I'm Li Tianfeng." ”

Yang Jinquan's voice came from the phone, and obviously with a little joy, "Mr. Li, the metallographic analysis and inspection results are out, the metallographic inspection of these two turbine guide blades is completely qualified, and according to your inspection method, these two blades are intact." ”

Li Tianfeng was overjoyed, a high heart finally landed completely, and said happily: "Okay, good, great, Director Yang, hard work." ”

Li Tianfeng put down the phone, and Sun Kang also asked with a happy face: "Tianfeng, the metallographic inspection results are qualified?" ”

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

Sun Kang was also overjoyed, "Tianfeng, great!" ”

Li Tianfeng also smiled happily, and thought in his heart, as long as there is another review of unqualified products, it will be enough to review these two slightly unqualified blades of size.

………

Tianfeng Technology Company, a conference room.

Li Tianfeng did things vigorously and resolutely, and on the afternoon of the completion of the metallographic inspection of these two turbine guide vanes, the nonconforming product review meeting was held in this conference room, focusing on the consideration of these two turbine guide vanes.

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

The two blades are both out of tolerance for a certain installation size, and the design requirements are 25±0.05, in fact, one is 24.91, and the other is 24.93.

However, even if it is not strict, it is also out of tolerance, which is unqualified, and everyone needs to review it together and come up with opinions on whether it can be used or not.

Li Tianfeng personally participated, and presided over the meeting, just now, Li Tianfeng has introduced the basic situation of these two blades, and everyone has also seen the size of the projector projection.

It was everyone's turn to speak and express their opinions, and one of the airworthiness representatives looked at one of the blades and said: "Mr. Li, I personally only agree to use one of them, the size of the other one is 24.91, and the deviation is 4 filaments, I think the deviation is a little big." ”

Only one of them was agreed, and the final assembly of the third prototype was still missing a turbine guide blade, and the final assembly was still impossible.

…………

Today's three watches, the second one is sent! (To be continued......)