"It's time to go. Director Liu, it only takes about fifty days to complete the processing..." Qin Kun quickly explained.

"Fifty days? I am still undergoing rough processing. The rough processing is completed and it takes a long time to perform natural aging. Are you going to use artificial aging to eliminate stress? Can artificial aging be compared with natural aging? In this case, how can it extend the service life?"

With the rapid development of the country, the demand for various equipment is becoming increasingly large. Under the contradiction between market demand and production capacity, the long and backward production process has begun to be eliminated.

Especially in the era where natural aging is mainly based on efficiency.

Economic construction is the center, everything is about money, and the process that requires a lot of time to wait is replaced by faster methods.

Natural aging is generally caused by wind, rain, sun, rain, seawater soaking and other methods to gradually release the stress generated by the metal material during production and processing. During the stress release process, due to the influence of gravity, under the weight of the material itself, bending and deformation will occur. Then, these bending and deformation areas will be cut off through finishing processing, which greatly improves the service life and performance of the entire part.

Artificial aging is to solve this problem by heating the material to reach a certain critical value. It has a great effect compared to natural aging, and the time is reduced by countless times.

However, in many important parts processing processes, artificial aging cannot replace natural aging!

Natural aging uses the natural environment to a greater extent, and artificial aging cannot be better than natural aging. The only thing is that the time required is very short, and natural aging often takes several months or even years, and artificial aging can reach an approximate level in just a few hours or dozens of hours.

Liu Yijiu has a very deep understanding of the mechanical processing process. When he sees such a situation, how can he not get angry?

"Director Liu, since we received the task and imitated the materials, we have made the blanks of these spindles. It has undergone rough processing before and has been aging in recent years. In order to speed up the progress of natural aging, we have also used manual heating of the materials and soaked in high temperatures... After testing, the internal stress level has reached a very small level..." Qin Kun said aggrievedly.

Liu Yijiu was stunned. He didn't expect that the ageing efficiency had been carried out for several years before. "What about the stress generated by the processing process? The stress generated by such a cutting process is also quite large, right?"

"There will definitely be stress generated during the processing process, and at the roots of the steps, and even processing stress concentration will occur. This can only be done by artificial aging. Although natural aging is more effective, we do not have enough time."

Qin Kun did not complain to Liu Yijiu, but said in a realistic way, "We don't have enough forging pressure, so it has a great impact on the performance of the spindle, especially the internal grain structure is not completely changed. According to our detection, there is still a phenomenon of coarse grains in the center... At the same time, when processing, because we only have large ordinary machine tools, the processing naturally cannot use smaller cutting volume and more tool paths like CNC equipment to make the processing as little processing stress as possible..."

This is not only the processing of the spindle, but also the processing of the propeller.

It seems like rough processing now, which is also due to the material performance problem. During the natural aging process of up to three years, the spindle weighing several tons has a deformation of more than ten millimeters under the influence of its own gravity. It has been processed in time before. If sufficient processing allowance is not left, it will even be scrapped after the aging is over.

"This is the level that can only be achieved after multiple processing and correcting. In this case, the most severe bending area is only less than 3 mm of margin. We are even a little worried about whether it is corroded..."

On the spinning spindle, there are indeed white pieces.

Liu Yijiu, who understands processing and manufacturing, understands that the black part is not processed. Obviously, these areas are the most severely bent during the aging process.

This is how heavy-duty parts are processed, leaving enough margin before the initial roughing process.

"There was no large press with a larger tonnage at the beginning, but now there is a large press of 70,000 tons on the second level. If these spindles are forged, their performance will be greatly improved, right?" Liu Yijiu shook his head helplessly and looked at the spindle that was rotating slowly.

Qin Kun immediately said with his eyes shining, "Director Liu, we actually wanted to re-press this 70,000-ton press with a double-weight large press, but the reserved allowance is not enough. If we can use a double-weight large press forging in the next batch of production, the service life can be increased by at least twice..."

"The spare parts of the four produced in this batch have not been cut, right?" Liu Yijiu asked. He had never thought that the large press would have such great benefits for this heavy spindle.

The most troublesome thing now is the problem of not having long service life.

I originally thought the other party did it on purpose, but now it seems that it is not the case?

In an instant, Director Liu's image of the fat Qin Kun improved.

"Not yet, it is in the planning stage. At present, our main processing business is on the battleships. The entire workshop is for your supporting business, and the others make way for this processing to ensure that we can complete the task within the construction period." Qin Kun said, pointing to a huge workpiece on the heavy-duty erected car with a diameter of five meters, which was like a fan blade on the outside.

Looking along, it was indeed a large propeller.

"This is directly used to rough machining the vertical turning, and then directly put on the gantry milling machine, manually process the curves on the top using the mold, and then manually grinding them during the final finishing process..." Without a heavy-duty milling composite machining center, the production of these huge propellers can only be done in this way.

Liu Yijiu frowned, "Don't our Ninth Hospital have a large five-axis machining center?"

"Yes, there is indeed one in the 701 sub-ship yard next to it. But the itinerary is a bit insufficient, and it is impossible to use it to process such a diameter of nearly six meters..." Qin Kun shook his head helplessly. "If there is a large machining center to process the propeller, mold it in one go, and then perform the final polishing, it will reduce the stress a lot and the service life will become longer. Now it is because there is no, so we can only do this. We originally hoped that the Ninth Hospital could help us do it first, but the Ninth Hospital's business is already busy, and we do not have enough funds at present..."

What Qin Kun said made Liu Yijiu fall into silence.

He was considering whether this guy wanted to use his own way to get a heavy five-axis machining center from the Ninth Hospital, as well as a heavy CNC lathe, or just explain the facts.

Regarding the machining center, the Republic has created many five-axis machining centers from the Japanese, and has also copied them himself, and a good research environment has been formed. He has not asked about these things anymore.

There are too many things he has to worry about all day long, so how can he know the specific situation of the equipment?

At least, the person in charge of key projects of the subordinate units of the Ninth Court did not ask him for the project because of the equipment.

The person in charge of each unit below communicates by himself. He doesn’t have so much time to get headaches about these trivial matters.

The various tasks of the Ninth Academy will definitely not give way to these manufacturers outside.

"So, whether it is the spindle or the propeller, the material problem is not the main one, is the production process?" Liu Yijiu did not worry about the purpose of Qin Kun's words, but asked him.

The attitude is much better than before.

Mai Dongyue couldn't understand why Liu Yijiu changed his attitude so quickly.

"It's true. We used to be the best unit in the domestic shipbuilding industry, but in recent years, technological updates have not been able to keep up. After the military has turned to civilians, the development in this area is naturally not as harsh as the requirements of military industry. Therefore, now, in addition to technical experience, reserves, and technical processing capabilities, it is not good..." Qin Kun felt a little lonely when he said this.

The military product orders of Jiangnan Factory are basically gone.

"Didn't your Jiangnan Factory also undertake the manufacturing of the 052 ship? Until now, you should have started laying keels, right?" Liu Yijiu suddenly remembered that the 112 ship of the 052 destroyer of the Republic was manufactured in the Jiangnan Factory, and the keels should have started laying this year.

In such a situation, their technology upgrade should be very important.

Did an accident happen?

Qin Kun nodded, "It's true. We originally participated in the design of the 052 project, but later it was cancelled due to some circumstances. Later, the construction was not on our side. It was not until 1987 that it was confirmed that the keel had already started laying in June this year..."

"The equipment road is updated, the five-axis machining center and other units do not have the name of your unit..."

The CNC equipment of the Ninth Hospital provides all the companies listed above, and at the same time, they have to supply part of it to the Soviet Union. The transactions between the two sides have not stopped for so many years.

"This is not what we know. Because of the importance, the leaders of our general factory went to Rongcheng several times, but could not make a production plan... If we had these advanced equipment, our production technology level could be improved a lot." Qin Kun's words once again made Liu Yijiu silent, "Director Liu, we also hope that the Jiangnan factory can always maintain its glory. It is not only civilian products, but also greater contributions to the national defense cause!"
Chapter completed!