"Don't worry, there will be no problem." Li Tianfeng gave everyone a reassuring look.

Seeing that Li Tianfeng looked very sure, everyone was a little relieved, but the frightened look on their faces still did not fade much, that is, everyone's heart was still hanging high.

The grinding of gears involves professional technical fields, Li Tianfeng is sure, coupled with the number just now and his own calculations, he is even more sure, although it is not foolproof, but ninety percent of the certainty is still there.

In everyone's eyes, Li Tianfeng evenly painted the tooth surface of the driving gear with red colorant, while the driven gear was not painted, and the driven gear was clean, which was in sharp contrast with the red driving gear.

After applying the colorant, Li Tianfeng slowly rotated the gear, and the part of the contact between the driving gear and the driving gear was immediately printed with the colorant, so that the meshing of the two gears could be clearly seen.

After turning around, the meshing of the two gears was clear, Li Tianfeng pointed to the tooth surface of the driven gear and said: "Have you seen it, these imprints can see the meshing situation, good gear meshing, this imprint should be oval, you take a look, whether they are all oval." ”

Hearing this, everyone came over together, and looked at it seriously, this time, everyone saw that the imprint of some meshing parts is oval, but there are also some meshing parts of the imprint shape is varied, there are triangles, circles, and even broom types, which belong to the poor meshing of Yan zhòng.

"Tut, sure enough, this is much clearer."

Everyone was amazed for a while, and then the eyes of Li Tianfeng were different, and most of them had a little more admiration in their eyes.

Liu Qingshan also praised: "Today, Li Gong taught everyone a lesson, everyone must remember this method. ”

"Remembered, remembered." Everyone nodded.

In fact, this method is not Li Tianfeng's first creation, in some professional gear factories, this is how to check the gear meshing, E factory as an aviation factory, gear is not their own strength, so everyone did not think of using this method.

Liu Qingshan has been in contact with this method a few times and knows the principle, but Liu Qingshan naturally will not steal the limelight from Li Tianfeng, not only will he not steal the limelight, but he will also praise loudly, asking everyone to remember this method.

The poor meshing of those tooth surfaces has been checked, and the next step is to grind the tooth surfaces, and carefully grind the tooth surfaces that are not well meshed.

Seeing that Li Tianfeng picked up a piece of white paper, he carefully and confidently placed it under this pair of gears, so that the dust particles generated by grinding would not remain in the engine, but fell on the white paper one after another.

Don't underestimate this little bit of dust particles, if it really stays in the engine, it will really happen. It can be seen from this point that Li Tianfeng is careful and meticulous.

Picking up the fine sandpaper, Li Tianfeng began to carefully grind it, and the initial action was still a little rusty, but he soon became proficient, first grinding with fine sandpaper, and then polishing the tooth surface with wool felt.

This is a high-precision gear, the requirements are extremely high, seeing Li Tianfeng grinding the gear, everyone's heart rose again, stared intently, and watched Li Tianfeng operate with bated breath, at this time, Li Tianfeng also had a positive face and entered the working state.

Suddenly, everything quieted down, only the sound of everyone's breathing and the rustle of sandpaper grinding in Li Tianfeng's hand, one by one, Li Tianfeng carefully polished.

After a careful and careful grinding, the rough step grinding work was finally completed, more just now the measurement results and their own calculations, the tooth surface grinding process of each gear is different, some are polished a little heavier, some are lighter, and some of the tooth surfaces with good meshing conditions do not need to be polished at all, completely depending on the actual situation.

After polishing, Li Tianfeng took the non-woven cotton, dipped it in a little clear kerosene, and wiped the two gears carefully and cleanly.

Everyone originally wanted to take a look at the craftsmanship of Expert Li and see the grinding quality of this tooth surface, but they didn't expect that everyone was taken aback by this look, and some people even opened their mouths in surprise.

How could it be, scrapped, scrapped, absolutely scrapped.

"How so?"

"Oh, that's a pity."

"Something went wrong, definitely something went wrong."

Seeing such a situation, everyone shook their heads, secretly saying that it was a pity, in everyone's opinion, such a situation must have been a problem when grinding just now.

On the tooth surface of the gear that Li Tianfeng just polished, there are obvious grinding marks, which forms a relatively obvious contrast with the smooth tooth surface around it.

This is a high-precision gear, as mentioned earlier, the requirements are very high, not only the dimensional accuracy requirements are high, but also the surface quality is also very high, the tooth surface roughness requirements must be above 0.8, or even higher, and the roughness of 0.4 can be achieved best.

And now, there is obviously a problem with the grinding part, it looks not only rough, but also obvious traces of grinding, the roughness may be 1.6, or even 3.2, such roughness, that is absolutely not good, this gear may be wasted.

Liu Qingshan also looked at Li Tianfeng worriedly, as if asking, there shouldn't be any problems with this, don't spend on this pair of gears, this is hundreds of thousands of yuan.

Seeing that everyone was looking at him like this, Li Tianfeng smiled slightly, and thought to himself, what are you anxious about, this is just the beginning, the preliminary polishing will be carried out, and the tooth surface will be polished later.

"Mr. Liu, don't worry, no problem." Li Tianfeng said confidently.

"It's fine." Liu Qingshan nodded lightly, and then looked at Li Tianfeng for the next step.

Li Tianfeng picked up the wool felt and began to polish it with precision and meticulousness. Wool felt is not better than fine sandpaper, even if the delicate sandpaper is sandpaper, it is sandpaper, it will be very rough, and wool felt is much better, wool felt is much more delicate than sandpaper.

Li Tianfeng's expression was very focused, and his movements were also very skillful, like a master of technology, holding a wool felt to polish the tooth surfaces that had just been polished with sandpaper.

After careful polishing, the tooth surface gradually smoothed, very smooth, fully met the technical roughness requirements, one by one the tooth surface was polished, and everyone quietly watched Li Tianfeng work, as if watching an art master create a work of art.

Time goes by minute, minute by minute......

"Alright." Li Tianfeng thought in his heart, put down the wool felt in his hand, picked up the non-woven cotton, dipped it in a little clear kerosene, and carefully wiped the teeth of the gears.

Where are the traces of polishing on the tooth surface, which is completely natural with the surroundings, and there is no trace to be seen, and the tooth surface is very smooth and clean, reflecting the luster of the metal.

"Tsk, tsk, tsk, it's unbelievable!"

"yes, I can't believe it."

All around, everyone was amazed, and they were amazed, but they didn't expect that Li Tianfeng had such a level, and this skill completely made people kneel. Many people admire it so much, but the vision of Li Tianfeng is different.

"Expert Li, I'm convinced today, it's an eye-opener!" Meng Qiang in the assembly workshop was full of admiration.

At this time, Liu Qingshan looked at Li Tianfeng's eyes, where was there still a little worry, it was completely appreciation, and even a little admiration.

Seeing that everyone's reaction was so big, Li Tianfeng grinned happily, and then said: "The gear grinding has been completed, let's check the meshing of the gear again." ”

"Yes, check the gear mesh." Everyone agreed.

Li Tianfeng still did it himself, evenly coated the colorant on the driving gear, and then gently rotated the pair of gears, one by one, imprinted on the working tooth surface of the driven gear.

The tooth surface of the driven gear is very smooth, one by one red imprints, basically into an oval shape, one by one such imprints, very eye-catching, as you know, this represents that the meshing of this pair of gears is very good.

"Okay, okay, this problem is finally solved." The happiest is Meng Qiang, the director of the assembly workshop, who is so happy that he praises again and again.

"Expert Li, thank you, thank you very much." Cao Wei, the technical director of the workshop, was obviously completely impressed by this, and his attitude changed greatly, and he gratefully shook Li Tianfeng's hand and thanked him again and again.

Liu Qingshan was also very happy, this is a very tricky problem of the turboshaft C engine, I didn't think that it was perfectly solved by Li Tianfeng, Liu Qingshan said happily: "Li Gong, amazing, amazing!" ”

Seeing everyone's gratitude and praise, Li Tianfeng was very happy in his heart, just like drinking cold snow water on dog days, he was very comfortable.

"Mr. Liu, Director Meng, Director Cao, this is as it should be, as it should be." Li Tianfeng said modestly again and again.

"Expert Li, you are too modest." Meng Qiang hurriedly said politely.

This time the problem was successfully solved, Meng Qiang was very happy, and personally sent Li Tianfeng to the door of the assembly workshop, at the door, holding Li Tianfeng's hand was grateful, and Li Tianfeng held Meng Qiang's big hand, obviously feeling a little abnormal, and there seemed to be something stuffed in the palm, like a card.

Li Tianfeng was stunned for a moment, and Meng Qiang obviously saw Li Tianfeng's reaction, and immediately said softly: "Expert Li, it's a little meaning." ”

This is a shopping card, Li Tianfeng smiled slightly, and did not refuse, because Li Tianfeng saw Meng Qiang's thoughts, obviously, Meng Qiang's gratitude to himself is one aspect, and the more important aspect is to have a good relationship with himself, if there are any thorny technical problems in the assembly workshop next time, you can find yourself to solve them.

"Director Meng is polite, then I won't be hypocritical, just look for me next time I have something." Li Tianfeng said with a smile.

"Expert Li is leaving." Meng Qiang looked enthusiastic and happy, waved at Li Tianfeng, and watched Li Tianfeng leave.

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