Defective !!

Everyone was shocked, and immediately came over one after another, looking at the position pointed by Chu Jiufang, on this fan impeller, there are several small trachomes, these trachoma, on this beautifully processed fan impeller, it looks so dazzling.

One of the vice presidents in charge of quality said: "Mr. Chu, this has nothing to do with Tianfeng Technology, this belongs to the quality of our casting blanks." ”

This batch of parts, the aluminum alloy blank of the fan impeller is cast by Jiufang Locomotive Parts Company, and the casting blank is processed by Tianfeng Technology.

"Oops, there's also a rough casting defect here, it's a pity!" A vice president found another fan impeller with a casting defect.

Chu Jiufang's face changed, he was very unhappy, waved his hand, called the inspector who was in charge of unpacking and inspecting the parts, and asked, "How many pieces of this batch of fan impellers have zài casting defects?" ”

The inspector replied truthfully: "Mr. Chu, there are a total of fifty parts in this batch, and I have measured the size, and the processing quality is excellent, however, there are seven parts with zài casting blank defects." ”

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

Secretly saying a pity, Chu Jiufang said: "Such a casting defect is a little too high." ”

The vice president of quality next to him said: "Mr. Chu, this is relatively low, after the blank was cast, we carried out a strict defect inspection, and found that there were no defects before sending Tianfeng Technology Company, these seven parts are all internal casting defects, and we can't do anything." ”

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

The vice president of quality said: "The impact must be there, but since there has been such a defect, it can only be used reluctantly, and when the next overhaul period arrives, it will be inspected again, and it will be replaced, and it will continue to be used if it can be continued." ”

Obviously, such a casting defect has a relatively large impact on the service life of the fan impeller, and it may be replaced after an overhaul period.

Chu Jiufang was more irritable in his heart, and looked at the technical vice president next to him with dissatisfaction, the problem of casting defects has been high in Jiufang Locomotive Parts Company, and it has not been effectively solved, no wonder Chu Jiufang is dissatisfied.

However, now that the matter is a foregone conclusion, the parts are processed into the final finished product, and it is impossible to carry out any salvage processing, so it can only be barely used.

So, Chu Jiufang waved his hand and said, "Arrange a test immediately to check the performance of this batch of fan impellers?" ”

Chu Jiufang is under a lot of pressure during this period of time, and there are many big problems with the ventilation and cooling products of Jiufang Locomotive Parts Company, and the problem is in the fan, and the problem of the fan is in the impeller, and the main engine factory has clearly asked Chu Jiufang to come up with an effective solution, and the deadline for this solution is about to expire.

It can be said that the current Chu Jiufang is relying on this batch of fan impellers processed by Tianfeng Technology Company to save his life, Chu Jiufang thought in his heart, wait for the performance test, don't have any problems.

This batch of fan impellers belongs to the impellers on a kind of main air cooler of Jiufang Locomotive Parts Company, and the amount is very large in a year.

The test of the fan impeller is not troublesome, take one of these impellers, arrange several workers to install it on a qualified main air cooler, and then push the installed main air cooler into the laboratory, and the relevant test work will start immediately.

The moment the button on the test bench was pressed, Chu Jiufang felt that his heartbeat was obviously "suddenly" accelerating, he was very concerned, his mood was slightly nervous, and he prayed that this experiment would be successful.

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

Several vice presidents next to him, according to experience, are ready to hold earplugs to plug their two earbuds, generally speaking, such a main air cooler test, the noise is very large, generally wear earplugs.

However, everyone was stunned, this time it was strange, the main air cooler had obviously reached normal working condition, but the noise was not as loud as they imagined, and it did not reach the unbearable Cheng dù, on the contrary, the sound of the fan was very stable.

This, this, this......

Everyone was stunned for a while, looking at each other, which almost completely subverted their impression, when did their main air cooler work so smoothly and the sound was so small.

Chu Jiufang was also stunned, and even said to the tester: "Xiao Zhang, has it not reached the rated working state?" ”

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

"Really?"

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

"Great!"

Several vice presidents next to him, happily, waved their fists vigorously, and even Chu Jiufang, the chairman and general manager, was a little out of shape, so happy that he slapped it fiercely and said loudly: "Okay, very good, great." ”

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

"Shock excellent!"

"Excellent wind speed!!"

"Noise is good!!

“……”

The number of tests one by one was reported, and when they heard this, everyone was happy and happy, and Chu Jiufang was the same, the pressure in his heart for a period of time was swept away, and there was no trace of anxiety, worry, or irritability, on the contrary, his heart was instantly filled with sunshine.

Like, like a gust of spring breeze, it instantly blew away the darkness shrouded in his heart, from the previous dark clouds and rain, it instantly became the current clear sky, warm sunshine.

Chu Jiufang waved his hand and said: "The batch of fan impellers sent by Tianfeng Technology will be arranged immediately, work overtime, and assemble overnight, and then the main air cooler with this batch of impellers will be sent to the main engine factory as soon as possible." ”

"Yes, yes, hurry up and send it to the main engine factory, our Jiufang Company should also fight a complete turnaround battle at this time." A vice president in charge of production danced with joy.

Chu Jiufang said happily: "Vice President Chen, tomorrow I will go with you, let's go to Tianfeng Technology in person, this time, I want to thank people." ”

Vice President Chen, who was in charge of quality, said: "Mr. Chu, I should really thank Tianfeng Technology for taking a look at this fan impeller, how good the quality of the processing is." ”

Chu Jiufang nodded, and at the same time had a plan in his heart, taking advantage of this time to go to Tianfeng Technology, in addition to thanking Tianfeng Technology, he was also ready to talk about in-depth cooperation with Tianfeng Technology, such as Tianfeng Technology is responsible for the processing of these fan impellers throughout the process, including the casting of impeller aluminum alloy blanks.

………

Tianfeng Technology, No. 1 processing workshop.

Li Tianfeng took Zeng Qinghai and walked into the door of the workshop, at this time, Li Tianfeng suddenly sneezed, couldn't help touching his nose, and thought in his heart, who is thinking about me.

The two walked into the No. 1 processing workshop and went straight to a large five-shaft, where a fan impeller was being processed for Jiufang locomotive accessories.

Because it is an aluminum alloy blank, and the accuracy requirements do not reach the same accuracy level as aero engine parts, the processing of several processes in the early stage is very fast, and the number of milling processes of the fan impeller blades is reached in just two or three days.

Wind turbine impeller blades, aluminum alloy material, and the blade type is not complicated, whether it is the blade type complex or the blade requires machining accuracy, and the aero engine impeller is several grades different, the processing is also very fast, very handy.

The CNC five-axis metal scrap collection hopper has been filled with "C" type aluminum alloy scraps, 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 to be processed.

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

The workers who operated this CNC five-axis machine saw that it was Li Tianfeng and Zeng Qinghai, and immediately said happily: "Mr. Li, Minister Zeng, the processing is very smooth, and the quality of the parts is also very good." ”

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

He didn't mean to stop, and continued to gush: "Mr. Li, the processing efficiency of such an aluminum alloy impeller is very high, and the milling of such an impeller can be completed in two or three hours, and there is basically no need to change the tool, if the impeller of aviation products in the past, it generally takes twenty or thirty hours to process a piece, and it often has to change the tool......"

The worker said a lot, and looked very happy, after listening, Li Tianfeng nodded, thought in his heart, don't look at this is not an aviation part, but the processing profit is very considerable, aluminum alloy impeller, the material is relatively soft, the use of alloy CNC milling cutter can be used for high-speed milling, and the tool wear is very small, the tool processing cost is very low.

Li Tianfeng, who was in a good mood, saw that a part was placed on the work table next to the machine tool, and he was also interested, personally picked up the measuring tool, measured the drawing, and measured the size, Li Tianfeng found that the dimensions were basically all medium.

The dimensional tolerance of such a fan impeller is generally relatively large, and there are almost no such tolerance grades as a few wires, and the tolerances of each size are generally more than a dozen wires, or even twenty or thirty wires, or dozens of wires.

Such parts can't be processed up to excellent Cheng dù, and Li Tianfeng is embarrassed.

Just like an excellent college student, if you suddenly want to do homework for junior high school students or elementary school students, you will also be easy to do for a while, which is a reason.

………

Today's three watches, the second one will be sent!! R1152