Because of the power outage, the processing of the whole blade was slightly later than expected, and in the afternoon of the next day, the finishing milling of all the blades was completed, and after the completion of this process, there was only one fine grinding process of the outer diameter of the blade tip, which was also a very critical process. ↑ Top Novel, www.

This is an integral fan plate, the maximum diameter of the part is the outer diameter of the blade tip, the maximum size of the outer diameter is Φ915 mm, the tolerance is relatively strict, only 5 wires, and the tip runout is also very strict, the outer runout relative to the benchmark a can not be greater than two wires.

Such a strict requirement is because of the stator on the fan blade and the aero engine, generally this stator is the outer ring of the fan, and there are strict clearance requirements between the two. If the gap is small, it may be scraped, and once it is scraped, it will also cause severe consequences.

Therefore, the processing requirements for the outer diameter size of this blade tip are very strict, and the requirements for the designer are also very high, and the designer must strictly calculate this size.

This size is not so easy to calculate, because the fan speed of the aero engine is generally as high as tens of thousands of revolutions, or tens of thousands of revolutions, such a high speed, the fan blades will be subjected to a huge centrifugal force, and the blade size will change.

That is to say, in the stationary state, the outer diameter of the blade tip of the fan is a size, when working, the fan rotates at high speed, the outer diameter of the blade tip is another size, when the fan is working, what is the size of the outer diameter of the blade tip, which is more complicated, and the fan speed, force, air compression ratio and many other factors are related.

How to accurately calculate the outer diameter of the blade tip in the theoretical state when the fan is working is a technical job, and it is necessary to have a relatively high design level.

The outer diameter of the fan tip is very strict, and the technical content of the subsequent fine grinding blade tip process is relatively high, and it is still intermittent grinding, which is more difficult.

Master Qian, a worker, is disassembling parts. The overall blade disc of the precision milled blade is disassembled from the machine tool, and while disassembling the parts, Master Qian praised that the parts are processed very exquisitely, and the blade processing is very smooth and the roughness is very good.

Although Master Qian is just a worker. But I also know that the impact of blade roughness on the quality of parts, because when working, the blades rotate at high speed, sucking a large amount of air into the aero engine from the outside, so that the speed of the air suddenly reaches the speed of sound, or even above the speed of sound, such a high air speed, if the blades are rougher. Then the performance of the fan will be greatly affected.

"This blade is so beautiful, the requirement is rough 0.8, it should be fully achieved." Master Qian thought to himself while disassembling the parts.

Removing the parts, and then moving them to the work table next to the machine tool and putting them away, Master Qian said in his heart, the parts are really light. It's a lot lighter than before.

At this point, the part has basically completed all the finishing. The parts are basically finally formed, and as the final formed aviation parts, the quality of the parts will definitely be relatively light, and it will definitely not be heavy, that's for sure.

Taking out the roughness comparison sample, Master Qian carefully compared the roughness of the blades. Nod your head, and the roughness is completely qualified.

Blade roughness is an important requirement, if the processing can not be achieved, then it must be arranged fitters for manual grinding, manual grinding. That's the fuck thing, because the blade has a contour requirement, generally five wires, and the maximum will not exceed ten wires, such a strict contour requirement, as long as it is manually polished with fine sandpaper, this contour will be out of tolerance.

The contour of the blade is out of tolerance, which will definitely affect the overall performance of the entire fan, and most of the domestic aviation companies are unable to meet the roughness requirements at one time when the blade is milled.

Domestic aviation manufacturing enterprises, can not manufacture world-class fans and compressors, design is one thing, the important aspect is the manufacturing process, such as the manual polishing of the blade, affecting the contour of the blade, how to manufacture world-class fans and compressors.

The roughness of the blades of this part is excellent, and it looks pleasing to the eye, and the worker Master Qian admires himself, carefully and happily looks at it for at least a few minutes.

Then, I picked up the measuring tool and began to measure some of the dimensions that could be measured, and recorded them one by one, and filled in the measured value record form.

Because it is a blade, it has its own unique shape, and some of the dimensions cannot be measured directly, so it needs to be measured.

When Li Tianfeng came to the processing site, the parts had been placed on the workbench of the large-scale precision three-coordinate meter, and the high-precision probe of the three-seat meter meter was being measured.

Li Tianfeng was in a good mood when he saw this part, because Li Tianfeng had already seen that the appearance quality of the parts was very good, very good, and this was the aero engine fan plate in Li Tianfeng's mind.

Regardless of the design level of this part, in terms of processing, it is really good, Li Tianfeng can't help but feel a little proud, after so many days, it is finally going to be a result, this part is smooth, high-quality processing, in Li Tianfeng's view, it is a good result.

Zhang Can was next to Li Tianfeng, his face was also happy, looking at this part, his eyes almost lit up, such a difficult part, processed so well, and it was still processed in the No. 1 workshop.

After measuring for about half an hour, all sizes and technical conditions were measured, and even the outer diameter of the leaf tip was also measured.

"Boss, all the sizes are qualified, and none of them are out of tolerance." Zhang Can's face was happy, and then he sighed softly, "Boss, the outer diameter of this leaf tip has really become longer, and it has also become 4.6 filaments longer, which is incredible." ”

Zhang Can saw that the leaves were "inexplicable" and really grew several threads by themselves, exactly as Li Tianfeng said, so Zhang Can was full of surprise.

The tip of the blade is not a plane, but an inclined plane with an angle, it is not easy to measure directly, before the precision milling of the blade, the measurement of the outer diameter of the tip of the blade was carried out, and the size obtained by the measurement of the three coordinates was Φ915.305 mm, and now it has become Φ915.351 mm, and the blade itself has become 0.046 mm longer, that is, 4.6 filaments.

See results like this. Zhang Can glanced at Li Tianfeng with admiration, "Boss, you are really like a god, no wonder you arrange such a processing process, first fine milling the blade, and then fine grinding the outer diameter of the blade tip." ”

Originally. Wei Jiannan insisted that such a processing process was inappropriate, and Wei Jiannan insisted that the outer diameter of the blade tip should be refined first, and then the blade should be finely milled.

Wei Jiannan never thought that the blade would become longer after fine milling, and it became longer than 4.6 wires, and the tolerance of the outer diameter of the blade tip was only 5 wires, which became 4.6 wires. That's going to be a big problem.

Because the outer diameter of the blade tip has been processed, after the precision milling of the blade, the blade becomes longer, and the original qualified outer diameter of the blade tip will be out of tolerance.

"Boss, you're amazing." Zhang Can's admired five-body throw.

Li Tianfeng smiled slightly, "Zhang Can, I don't understand why this leaf grows on its own!" ”

"Boss, I really don't know. Tell me about it. Zhang Can was also humble and immediately asked for advice.

Li Tianfeng did not hide his secrets either. "This is called 'processing creep' in processing, and some grades of materials, especially titanium alloys, are more common, and after a large amount of material is removed, there will be very small changes in the direction of the material grains, like this fan blade." With a large amount of material removed from the beginning of the blank and almost 400 mm in length, the blades creep and become a few strands of ......."

After listening to Li Tianfeng's detailed explanation, Zhang Can suddenly realized. I understood what was going on, "Boss, this change is very small, if it weren't for the comparison measurement before and after processing, it would be really difficult to find." ”

Li Tianfeng nodded, "This change is very small, if the blade is relatively short, the change will be smaller, although the change is small, but if the processing size is very strict, we must pay special attention to this creep, and we must take corresponding countermeasures in the processing technology." ”

"Well, I understand this time, and I know how to deal with this situation in the future." Zhang Can nodded.

The size of the overall blade disc is measured out, the processing quality is excellent, it is a very high-quality part, and the follow-up fine grinding blades have also begun to prepare for the work, if it is fast, it will be tomorrow, and if it is slow, it should be able to enter the fine grinding process of the blade.

Processing preparations, naturally, do not need Li Tianfeng to worry about it personally, it is enough to have Zhang Can's arrangement.

Take a look at the early days before getting off work in the afternoon, Li Tianfeng went around the processing site of the No. 1 workshop, and after looking around, Li Tianfeng was more satisfied, and the No. 1 processing workshop was officially on the right track.

Although it is mainly OEM for others, such as processing parts for factory E, and then processing a large number of parts for Haliburton, and may also be OEM for other aviation companies in the future, the management has kept up, and the workers have gradually passed the adaptation period and run-in period, and gradually entered the period of improvement and growth.

Such an OEM, because the parts requirements are very strict, can train people, and will lay a solid technical foundation for the future processing of their own aviation parts.

The last time for the international industry and trade company OEM of the 200 pieces of Harry Burton company parts, after the delivery, Harry Burton is very satisfied, Tianfeng Technology has received a total value of more than 200 million US dollars of super large orders, followed by 800 pieces of such parts, the second batch of 200 pieces of bar blank has been shipped to Tianfeng Technology, will start processing soon.

The super large order of more than 200 million US dollars, some parts for Tianfeng Technology to purchase materials for processing, part for Harry Burton to provide blanks, the processing of these parts, at the latest, will not exceed a month, will also begin to be processed.

………

"Mr. Long, your plane tonight, tomorrow you want to come to us to take a look at the processing of that large integral blade disc?"

After receiving Long Yingshi's call, Li Tianfeng was stunned for a while, and he didn't expect that Long Yingshi attached so much importance to this part, and he would come over in person.

Li Tianfeng thought in his heart, this part should not be simple, it should not be what Long Yingshi said, it is just for scientific research and related experiments.

………

Today's three watches, the third one is sent!

Then ask for monthly passes, recommended tickets and collections, and everyone will support them. (To be continued......) R527