Projection sample, as the name suggests, is used to do projection to check the tenon and groove profile, so that you can also check whether the final forming fine broach is qualified, as well as find some other defects.

The projection sample is small, a small boxy piece that can be clamped on top of a broaching fixture. After the adjustment of the sample was 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 stroke, a stroke of broaching this projection sample. One stroke and one knife box, a full five strokes.

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

Hearing this, Li Tianfeng nodded, not very sure that the projection sample could be qualified this time, because the projection sample and the turbine disk are the same material, and they are also high-temperature alloys, which are more difficult to process.

Aero engines generally include several parts, compressor parts, combustion chamber parts, turbine parts, etc., low-temperature parts are generally made of titanium alloy, aluminum-magnesium alloy, and heat-resistant parts are generally made of high-temperature alloys, such as combustion chamber parts, turbine parts, turboshaft C engine turbine disc is still a new type of high-temperature alloy.

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

The turbo disc of the turboshaft C engine is naturally a superalloy material, and it is still a powder metallurgy superalloy that is relatively difficult to process.

"Let's go, let's go do a projection check." Li Tianfeng said.

After a projection inspection, Li Tianfeng breathed a sigh of relief, there is nothing abnormal, the projection is magnified 50 times to check, if no defects are found, there will be basically no problems.

"Li Gong, can you broach formal parts?" Master Yan asked.

Li Tianfeng sighed and said, "I think it's okay." ”

With Li Tianfeng's consent, Master Yan immediately put the first formal part on it and began to broach in an orderly manner, while Li Tianfeng watched the broaching situation from the sidelines, and according to experience, broaching was normal.

The tongue and groove drawn out are very smooth, there is no groove, and the metal scraps drawn out are also standard C-type, Li Tianfeng is completely relieved.

A part was broached for more than an hour, and the first part was finally broached, and Master Yan seemed very happy to see it so smooth, "Li Gong, it was completed so quickly and so smoothly, the surface of the tongue and groove seems to be very good, you can see that the surface of the tongue and groove is like a mirror." ”

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

You know, the turbine disc is a stressed part, and the tongue and groove is the key stressed part of the turbine disc, when the engine is working, it not only has to withstand the pre-turbine temperature of more than 1,000 degrees, but also has to withstand the terrifying centrifugal force, and transmits huge power to the outside.

In this case, as long as there is a small defect on the surface of the tongue and groove, such as as as a small groove on the surface of the tongue groove, it will cause irreparable losses, and even destroy people.

Li Tianfeng's mood was also good, seeing that the parts were disassembled by Master Yan, Li Tianfeng measured the size with great interest, and after some measurement, Li Tianfeng nodded with satisfaction, these sizes are all qualified.

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

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

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

Such a difficult turbine disc broaching was actually successful, and Master Yan felt a sense of accomplishment in his heart, at this time, Master Yan's eyes were the same when he looked at Li Tianfeng, and he even had a little sense of worship.

"How?" 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 immediately 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 obviously with a hint of good play, in Huang Xuewen's heart, he was already sure that Li Tianfeng could not complete the grinding of the turbine disk.

Just kidding, this kind of superalloy of powder metallurgy is very difficult to process, and for this kind of new material, the entire E factory does not have enough processing experience, even Huang Xuewen, the deputy director of the engineering technology department, is not sure.

Huang Xuewen stood aside and looked at Li Tianfeng with an obvious joke expression.

"An idiot." Li Tianfeng scolded secretly in his heart, and didn't shake off Huang Xuewen, Li Tianfeng said directly to Liu Qingshan: "Mr. Liu, one qiē 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, the rest of the dimensions are all qualified." ”

"All sizes are acceptable!"

Liu Qingshan's interest also came up, and his mood suddenly felt unprecedentedly good, "Xiao Li, Zhu always had to come over in person, but Mr. Zhu was busy, and entrusted me to come over and take a look, but I didn't expect that Xiao Li lived up to expectations and gave us a big surprise." ”

The "Mr. Zhu" in Liu Qingshan's mouth is naturally the number one "Zhu Maohua" of Factory E. After receiving the praise, Li Tianfeng was also happy in his heart.

However, a nasty voice sounded, and it was Huang Xuewen who spoke, "Mr. Liu, don't listen to his nonsense, such a difficult material to process, it is impossible to be so smooth." ”

"Oh!"

Hearing this, Liu Qingshan looked at Li Tianfeng hesitantly.

Li Tianfeng looked at this 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 I don't believe that I can successfully pull this turbine disc out." ”

As soon as the words stopped, and after a little silence, Li Tianfeng looked at Huang Xuewen and said, "Deputy Director Huang, I don't know if you dare to make a bet with me?" ”

Li Tianfeng used the agitation method, and did not say anything first, but first asked the other party if he dared to bet. Sure enough, being provoked by Li Tianfeng like this, Huang Xuewen immediately said loudly: "Joke, what don't I dare to bet with you." ”

Seeing Huang Xuewen take the bait, Li Tianfeng smiled, "Deputy Director Huang, let's bet on this freshly drawn turbine disc, if the size of this broaching process is all qualified, you will climb out from here, if there is only one size unqualified, I will climb out from here, dare not, Deputy Director Huang!" ”

Thinking of climbing out of here if he lost, Huang Xuewen hesitated for a while, and some workers on the side, including Master Yan, looked at Huang Xuewen, and everyone knew that the two had bet.

"Oh, someone is cowardly, and they don't dare to gamble." I don't know who it is, the voice is quite loud, it sounded not far away, it may be one of the workers.

Li Tianfeng thought in his heart, his popularity is not bad, and some of these workers secretly help him, which is to anger Huang Xuewen!

Sure enough, Huang Xuewen's face turned red instantly, his face was red and his neck was thick, "Bet on it, see how you climb out in front of everyone if you lose later." ”

Liu Qingshan is the deputy chief engineer of Factory E, considering that such a bet is a bit unorthodox, so he said: "Xiao Li, forget it, don't gamble." ”

Li Tianfeng said: "Mr. Liu, this is a matter between me and Deputy Director Huang, you just treat it as entertainment." ”

Liu Qingshan smiled bitterly and shook his head slightly, Liu Qingshan was also a little unhappy Huang Xuewen, he supported Li Tianfeng in front of Zhu Maohua at the beginning, and almost made a package ticket Li Tianfeng can process this broaching process qualified, but now it is good, Huang Xuewen insisted that Li Tianfeng could not be qualified, isn't this difficult to get along with himself.

So, Liu Qingshan didn't say anything, stood aside with a playful face, watching the two bet, some workers next to him, seeing that Deputy Chief Engineer Liu did not object, everyone's interest came, at least nearly ten people stopped their work and watched from afar.

"Master Tang, come and help us check this turbine disk." Li Tianfeng shouted to Tang Min, the inspector who was standing on the periphery watching the excitement.

Tang Min is also a teacher, an inspector who has been working for more than 20 years, with rich experience and high skills. Hearing Li Tianfeng call himself, he didn't hesitate, and came over immediately.

Knowing that the two were making a bet, Tang Min didn't dare to slack off, and immediately measured the dimensions carefully one by one, and said the measurement results while measuring.

"Qualified!"

"Qualified!"

"Medium!"

"Qualified!"

“……”

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

"Xiao Li is good, he really processed this turbine disc qualified." Seeing that all the sizes were qualified, Liu Qingshan gently patted Li Tianfeng's shoulder in his heart.

"Oh, someone's going to climb out."

No one in the crowd was coaxing, the voice was quite loud, Huang Xuewen's face was a little ugly, so black that he could almost pinch out the water.

"Hmph, there are still a few positions that have not been measured, and I don't know who climbed out." Huang Xuewen stiffened his mouth and pinned his hopes on the few positions that could not be measured for the time being.

The size requirements of these positions are very strict, and the tolerances are extremely small, and one of the position degrees is required to be within 0.02 mm, which is generally very difficult to meet the requirements.

Obviously, Huang Xuewen pinned his hopes on these positional dimensions, and as for whether these positional dimensions will be out of tolerance, they must be measured to determine.