Flawed!!!

Everyone was shocked and immediately came over and looked at the position Chu Jiufang pointed at. There were a few tiny trachomas on this fan impeller. These trachomas looked so dazzling on this beautifully processed fan impeller.

One of the deputy general managers in charge of quality said: "Mr. Chu, this has nothing to do with Tianfeng Technology. It is a quality issue for us to cast roughs."

This batch of parts, the aluminum alloy blank of the fan impeller, was cast by Jiufang Locomotive Accessories Company, and the casting blank is processed by Fatianfeng Technology. Now, casting defects have occurred on the parts, which really has nothing to do with Tianfeng Technology.

"Oh, there are also blank casting defects here, what a pity!" A vice president discovered another casting defect on the fan impeller.

Chu Jiufang's face changed and he was very unhappy. He waved his hand and called the inspector responsible for unboxing inspection of parts and asked: "How many pieces of this batch of fan impellers have casting defects."

The inspector answered truthfully: "Mr. Chu, there are 50 parts in this batch. I have measured the sizes and the processing quality is excellent. However, seven parts have casting blank defects."

Chu Jiufang said in his heart: "The parts are processed so beautifully, and the defects in casting blanks are actually more than 10%, which is a pity."

It was a pity that Chu Jiufang said, "The proportion of such casting defects is a little high."

The vice president of quality next to him said: "Mr. Chu, this is quite low. After the blank was cast, we conducted a strict defect inspection and found that there were no defects before we found that there were no defects. These seven parts were all internal casting defects, and we could do nothing."

Chu Jiufang sighed and said, "Does such casting defect have any impact on the use of fan impellers?"

The quality deputy general manager said: "There must be an impact, but since such a defect has occurred, I can only use it barely. Once the next major repair period is over, check it again, replace it if it is time to replace it, and continue to use it if it can be used."

Obviously, such casting defects have a relatively large impact on the service life of the fan impeller. They may need to be replaced after an overhaul. You should know that the cooling and ventilation system of Jiufang locomotive accessories has a overhaul of only two years.

Chu Jiufang was quite irritable. He looked at the technical vice president next to him with dissatisfaction. The problem of casting defects has always been high in Jiufang Locomotive Accessories Company and has not been effectively solved. No wonder Chu Jiufang was dissatisfied.

However, things are now in a foregone conclusion, and the parts are processed into the final finished product, so it is impossible to perform any rescue processing. I can only use it with just a little bit of it.

So, Chu Jiufang waved and said, "Arranging the test immediately. Check the performance of these fan impellers?"

Chu Jiufang has been under great pressure during this period. Jiufang Locomotive Accessories Company's ventilation and cooling products have many major problems, and the problem lies with the fan, and the problem with the fan is on the impeller. The OEM has clearly asked Chu Jiufang to come up with an effective solution. The resolution period is about to expire.

It can be said that Chu Jiufang is now relying on this batch of fan impellers processed by Tianfeng Technology Company to save his life. Chu Jiufang thought to himself, wait for the performance test, and never have any problems.

This batch of fan impellers belong to a main cold fan of Jiufang Locomotive Parts Company, and the amount is very high in one year.

The test of fan impeller is not troublesome. Take a piece of such an impeller and arrange several workers to install it on a qualified main cooler, and then push the installed main cooler into the laboratory. The relevant test work will begin immediately.

The moment the button on the test bench was pressed, Chu Jiufang felt his heartbeat accelerate significantly, and he was very concerned, and he was slightly nervous, praying that this test must be successful.

As the test button is pressed, the main cooler immediately starts to work, and the rotation speed of the fan impeller gradually increases.

Several vice presidents next to them were prepared to use earplugs to plug their earplugs according to their experience. Generally speaking, such a main air cooler test is very noisy and earplugs are usually worn.

However, everyone was stunned. This time it was strange that the main cold fan had obviously reached normal working state, but the noise was not as high as I imagined, and it did not reach an unbearable level. On the contrary, the fan sound was very stable.

This, this, this...

Everyone was shocked and looked at each other, which almost completely subverted their impression. When did their main cold fan work so smoothly and the sound was so small.

Chu Jiufang was also shocked and even said to the tester: "Xiao Zhang, hasn't it reached the rated working state?"

Tester Xiao Zhang looked at the data from the sensor, carefully looked at the test software on the computer, and after confirming that it was correct, Xiao Zhang said: "Mr. Chu has fully reached the rated working state, and the fan speed has also reached the designed rated speed."

"real?"

"Mr. Chu, it's true that it has reached the rated state." Xiao Zhang said affirmatively.

"Very good!"

The few vice presidents next to him were happy and waved their fists hard. Even Chu Jiufang, the chairman and general manager, was a little out of control. He patted him with joy and said loudly: "Okay, very good, great."

Seeing that everyone was so happy, Xiao Zhang immediately said loudly.

“Good vibration!”

“Excellent wind speed!!”

“Great noise!!!”

“…”

The experimental data were reported one by one. When everyone heard this, they looked happy and happy. Chu Jiufang was the same. The pressure in his heart for this period was wiped out, and there was no longer any anxiety, worry, or irritability. On the contrary, his heart was filled with sunshine.

It seemed like a spring breeze instantly blew away the darkness that enveloped my heart. From the dark clouds and continuous rain in the past, it instantly became the clear sky and the warm sunshine shining brightly.

Chu Jiufang waved his hand and said, "The batch of fan impellers sent by Tianfeng Technology is arranged immediately, work overtime and assemble overnight, and then the main cold air fan equipped with these impellers is quickly sent to the main machine factory."

"Yes, yes, send it to the main factory as soon as possible. Our Jiufang Company should also make a complete comeback at this time." A vice president in charge of production was happy.

Chu Jiufang said happily: "Vice President Chen, let's go to Tianfeng Technology with me tomorrow. This time, I have to thank them very much."

Deputy General Chen, who is in charge of quality, said: "Mr. Chu, I really should thank Tianfeng Technology for looking at the fan impeller, how good the quality of the processing is."

Chu Jiufang nodded, and at the same time he had plans to take advantage of this trip to Tianfeng Technology. In addition to thanking Tianfeng Technology, he also prepared to have a good talk with Tianfeng Technology about in-depth cooperation, such as Tianfeng Technology is responsible for the processing of these fan impellers throughout the process, including the casting of impellers aluminum alloy blanks.

………

Tianfeng Technology, No. 1 processing workshop.

Li Tianfeng took Zeng Qinghai into the workshop gate. At this time, Li Tianfeng suddenly sneezes and couldn't help but touch his nose, thinking to himself, Who is thinking about me?

The two walked into the No. 1 processing workshop and headed straight to a large five-axis. Here, a fan impeller that was processing Jiufang locomotive accessories. This batch of fan impellers was cast by Tianfeng Technology Company itself.

Because it is an aluminum alloy blank and the accuracy requirements do not reach the accuracy level of aircraft engine parts, the previous several processes were processed very quickly, and the number milling process of fan impeller blades was achieved in just two or three days.

The fan impeller blades are made of aluminum alloy, and the blade shape is not complicated. Whether it is the complexity of the blade shape or the processing accuracy required for the blade, it is several levels different from the aircraft engine impeller, and it is very fast and easy to process.

This CNC five-axis metal chip collection bucket is filled with "c" type aluminum alloy chip metal chips, all of which are milled from the impeller.

In the wooden box next to the machine tool, dozens of fan impellers are neatly placed, some of which have been processed and some are waiting for processing.

Li Tianfeng walked over and asked, "How is the processing situation?"

When the workers who operated this CNC five-axis, they saw that it was Li Tianfeng and Zeng Qinghai, they immediately said happily: "Mr. Li, Minister Zeng, has been processed very smoothly and the parts are of very good quality."

The worker was obviously an extrovert, and Li Tianfeng asked, and the worker answered a lot in one breath.

There was no intention of stopping, and continued to talk: "Mr. Li, such an aluminum alloy impeller is very efficient. It takes two or three hours to mill such an impeller, and basically no need to change the tool. If the impeller of an aviation product used to be processed, it usually takes 2 or 30 hours to process one, and the tool needs to be changed often..."

The worker said a lot and looked very happy. After listening, Li Tianfeng nodded and thought to himself, don’t think that this is not an aviation part, but the processing profit is very considerable. The aluminum alloy impeller is made of softer. High-speed milling can be used with alloy CNC milling cutters, and the tool wear is very little, and the tool processing cost is very low.

Li Tianfeng, who was in a good mood, saw a piece of parts placed on the work table next to the machine tool. He was also interested. He personally picked up the measuring tool and measured the drawings. After measuring the sizes, Li Tianfeng found that all the sizes were basically the same.

Such fan impellers generally have large size tolerances, and there are almost no tolerance levels such as a few wires. The tolerances of each size are generally more than ten wires, even twenty, thirty wires, or dozens of wires.

Li Tianfeng was embarrassed to have such parts not yet processed to the level of excellent processing.

Just like an excellent college student who suddenly asks you to do homework for junior high school students or elementary school students, you will also be able to do it easily. This is the truth.

………

Today's third update, the second update is here!!! (To be continued...)

Chapter 194 Excellent performance:
Chapter completed!