Projection specimens, as the name suggests, are used to project the tongue and groove profile, so that they can also check whether the final forming fine broach is qualified and some other defects are found.

The projection sample is very small, a small piece that can be clamped on the broaching fixture. After the adjustment of the sample is completed, Master Yan began to prepare the broaching projection sample according to Li Tianfeng's requirements.

Because the center distance has been adjusted, Master Yan started a trip, a trip to the projection sample. One trip to one knife box, and a full five trips.

"Mr. Li, the projection sample has been broached."

Upon hearing this, Li Tianfeng nodded, not very sure that the projection sample this time would be qualified, because the projection sample and the turbine disc are of the same material and are also high-temperature alloys, so the processing is relatively difficult.

Aero engines generally include several parts, compressor part, combustion chamber part, turbine part, etc. Low-temperature components generally use titanium alloys, aluminum-magnesium alloys, while heat-resistant parts generally use high-temperature alloys, such as combustion chamber parts, turbine parts, and turbine shaft C engine turbine discs use new high-temperature alloys.

High-temperature alloys have excellent high-temperature strength, good oxidation and thermal corrosion resistance, good fatigue performance, fracture toughness and other comprehensive properties, and have become an irreplaceable key material for hot end components of military and civilian gas turbine engines.

Turbine Shaft C engine turbine disc is naturally a high-temperature alloy material, and it is a relatively difficult powder metallurgical high-temperature alloy.

"Let's go and do a projection inspection." Li Tianfeng said.

After a projection inspection, Li Tianfeng breathed a sigh of relief. There was no abnormality. The projection was magnified 50 times. If there was no defect found, there would be basically no problem.

"Mr. Li, can you pick up formal parts?" Master Yan asked for instructions.

Li Tianfeng pondered for a moment and said, "I think it's OK."

With Li Tianfeng's approval, Master Yan immediately installed the first formal part and began to brochure in an orderly manner. Li Tianfeng watched the brochure situation. According to experience, brochure was normal.

The tongue and grooves that were drawn out were very smooth, without grooves, and the metal chips drawn out were also standard C-shaped, so Li Tianfeng was completely relieved.

After more than an hour of broaching one part, the first part was finally broached. Seeing this smooth, Master Yan seemed very happy, "Mr. Li, it was completed so quickly and smoothly. The surface of the tongue and groove seems very good. Look at the surface of the tongue and groove one by one, like a mirror."

Li Tianfeng naturally also saw the processing situation. The roughness of the tongue and groove surface is really good, very smooth, reflecting the luster of metal.

You should know that the turbine disc is a force-bearing component, and the tongue and groove are the key force-bearing components of the turbine disc. When the engine is working, it not only has to withstand the pre-turbo temperature of more than 1,000 degrees, but also has to withstand terrifying centrifugal force and transmit huge power to the outside.

In this case, as long as there are small defects on the surface of the tongue and groove, such as a tiny groove with less than hair on the surface of the tongue and groove, it will cause irreparable losses and may even cause damage to others.

Li Tianfeng was in a good mood. Seeing that the parts were disassembled by Master Yan, Li Tianfeng was excited to measure the sizes. After some measurements, Li Tianfeng nodded with satisfaction, and all of these sizes were qualified.

You should know that these dimensional tolerances are very small, all of which are a few wires of tolerances, and several key dimensional tolerances are only ±0.025 mm. Even such a small tolerance is qualified.

"It's just a few positions and dimensions, these dimensions need to be measured." Li Tianfeng put down the measuring instrument in his hand.

"Mr. Li, all the other dimensions are qualified, and these positions will definitely not be bad." Master Yan seemed full of confidence.

The turbo plate that is so difficult to process is successful, and Master Yan felt a sense of accomplishment in his heart. At this time, Master Yan's eyes looked at Li Tianfeng the same, and even felt a little admiration.

"How is it?" A voice with a hint of majesty sounded in his ears. Such a person must have been in a high position for a long time.

Hearing this, Li Tianfeng immediately turned his head and smiled and said, "Mr. Liu, you are here."

Next to Liu Qingshan, there was a figure that Li Tianfeng didn't want to see. Huang Xuewen also came, and there was obviously a hint of watching the show. In Huang Xuewen's heart, he was convinced that Li Tianfeng could not successfully complete the turbo plate.

Just kidding, this powder metallurgical high-temperature alloy is very difficult to process. The entire E factory does not have enough processing experience for this type of new materials, and even Huang Xuewen, the deputy director of the Engineering and Technology Department, is not sure.

Huang Xuewen stood aside and looked at Li Tianfeng with a clearly joking expression.

"Idiot." Li Tianfeng cursed in his heart, and did not shake Huang Xuewen. Li Tianfeng said to Liu Qingshan directly: "Mr. Liu, everything is normal. The first part has been processed. We measured it ourselves. Except for a few position dimensions that cannot be directly measured for the time being, all the other dimensions are qualified."

“All sizes are qualified!”

Liu Qingshan's interest also rose, and he felt unprecedentedly happy. "Xiao Li, Zhu originally wanted to come here in person, but Mr. Zhu was busy and asked me to come and take a look. He didn't expect that Xiao Li lived up to everyone's expectations and gave us a big surprise."

The "President Zhu" in Liu Qingshan's mouth is naturally the "Zhu Maohua", the top leader of Factory E. Li Tianfeng was also happy to be praised.

However, a disgusting voice sounded, and Huang Xuewen was talking, "Mr. Liu, don't listen to him nonsense. Such difficult-to-process materials cannot be so smooth."

"oh!"

Upon hearing this, Liu Qingshan hesitated to look at Li Tianfeng's eyes.

Li Tianfeng looked at Huang Xuewen coldly, and then said to Liu Qingshan: "Is it qualified? Just ask the inspector to come and measure it. In addition, Deputy Director Huang seems to have a deep prejudice against me and doesn't believe that I can successfully roll out the turbo disc."

After stopping, Li Tianfeng looked at Huang Xuewen and said, "Deputy Director Huang, don't you know if you dare to make a bet with me?"

Li Tianfeng used the provocation method, and did not say anything at all, but asked the other party if he dared to gamble. Sure enough, when Li Tianfeng was so aroused, Huang Xuewen immediately said loudly: "Just, what do I dare not gamble with you?"

Seeing Huang Xuewen taking the bait, Li Tianfeng smiled, "Deputy Director Huang, we bet on this newly-bred turbo disc. If the sizes of this broaching process are all qualified, you can climb out from here. If there is one size that is not qualified, I will climb out from here. Do you dare, Deputy Director Huang!"

Thinking of losing, he wanted to climb out of here, Huang Xuewen hesitated for a while, while some workers next to him, including Master Yan, looked at Huang Xuewen, and everyone knew that the two had made a bet.

"Oh, someone is scared and dare not gamble." I don't know who it was, but the voice was quite loud, and it sounded not far away. It might be one of the workers.

Li Tianfeng thought to himself that he has a good popularity, and some of these workers secretly helped him, which is angering Huang Xuewen!

Sure enough, Huang Xuewen's face turned red instantly, with a blushing face and a thick neck, "Just bet, see if you lose later, how can you crawl out in front of everyone."

Liu Qingshan is the deputy chief engineer of Factory E. Considering that such bets are a bit unconventional, he said, "Xiao Li, forget it, don't bet."

Li Tianfeng said: "Mr. Liu, this is a matter between me and Deputy Director Huang. Just think this is entertainment."

Liu Qingshan smiled bitterly and shook his head slightly. Liu Qingshan was also a little unhappy. Huang Xuewen was a little unhappy. He supported Li Tianfeng in front of Zhu Maohua, and almost made a promise that Li Tianfeng could pass the broaching process. Now, it's better. Huang Xuewen insisted that Li Tianfeng could not pass the processing. Isn't this arguing with him?

So Liu Qingshan stopped talking and stood aside with a joke. He watched the two bets. Some workers next to him saw that Vice President Liu did not object, and everyone was interested. At least nearly ten people stopped their work and watched from a distance.

"Master Tang, come and check this turbo plate for us." Li Tianfeng shouted to Tang Min, an inspector standing outside watching the fun.

Tang Min is also a master. She has been working as an inspector for more than 20 years, with rich experience and high skills. She didn't hesitate when she heard Li Tianfeng call him, and she came over immediately.

Knowing that the two were betting, Tang Min didn't dare to neglect it. He immediately measured the sizes carefully, and said the measurement results while measuring.

"qualified!"

"qualified!"

"Mean-poor!"

"qualified!"

“…”

After measuring the sizes one by one, Huang Xuewen's face looked a little ugly. All of these sizes were qualified, and none of them were out of reach.

"Xiao Li is not bad, I really processed this turbo plate that is qualified." Seeing that all the sizes are qualified, Liu Qingshan patted Li Tianfeng's shoulder in his heart.

"Oh, someone is going to climb out."

Not even among the crowd, anyone was making a fuss. The voice was quite loud. Huang Xuewen's face became a little ugly again, so dark that he could almost pinch out the water.

"Hmph, there are still a few position dimensions that have not been measured, and I don't know who has climbed out." Huang Xuewen was stubborn and placed his hope on those position dimensions that cannot be measured for the time being.

These positional dimensions are very strict and the tolerances are extremely small. One of them is required to be within 0.02 mm, which is generally very difficult to meet the requirements.

Obviously, Huang Xuewen placed his hopes on these positions and dimensions. As for whether these positions and dimensions will exceed the difference, it must be measured to determine.
Chapter completed!