Super military empire

"Time is too late. Director Liu, it only takes about fifty days to complete the processing..." Qin Kun explained quickly.

"Fifty days? At present, rough machining is still being carried out. After the rough machining is completed, a long period of natural aging is required. Are you planning to use artificial aging to eliminate stress? Can artificial aging be compared with natural aging? In this case, How can the service life be extended?"

With the rapid development of the country, the demand for various equipment is increasing. Under the pressure of the contradiction between market demand and production capacity, the long and backward production technology has begun to be eliminated.

Especially natural aging in the age of efficiency.

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

Natural aging is generally through wind and rain, sun and rain, sea water immersion, etc., to gradually release the internal stress generated by the metal material from production to processing.In the process of stress release, due to the influence of gravity, under the weight of the material itself, bending deformation and other conditions will occur, and then these bending deformations will be cut away by finishing, which has an impact on the service life and performance of the entire part. Great improvement.

Artificial aging is to heat the material to reach a certain critical value to solve this problem. Compared with natural aging, the effect is not small, and the time is reduced by several times.

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

Natural aging uses the natural environment and strength to release the stress inside the material to a greater extent, but artificial aging cannot be better than natural aging.The only advantage is that the time required is very short. Natural aging often takes months or even years. Artificial aging can reach a similar level in just a few hours or tens of hours.

Liu Yijiu has a deep understanding of the machining process. How can he not get angry when he sees such a situation?

"Director Liu, since we received the task and imitated the materials, we have manufactured the blanks of these spindles. The rough machining has been done before, and aging has been carried out in recent years. In order to speed up the progress of natural aging, The material was also heated manually, soaked in Shanghai water at a high temperature... After testing, the internal stress has reached a very small level..." Qin Kun said aggrievedly.

Liu Yijiu was stunned. He really didn't expect the statute of limitations for several years before."What about the stress generated by the machining process? The stress generated by such a cutting process is not small, right?"

"Stress will definitely be generated during the processing, and even at the root of the step, the processing stress will be concentrated. 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 truthfully, "Our forging pressure is not enough, so the impact on the performance of the spindle is not small, especially the internal grain structure is not completely changed. According to our inspection, 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, processing naturally cannot use smaller cutting volume and more tools like CNC equipment. Lu Lai makes as little processing stress as possible during processing..."

This is not only the case for the machining of the main shaft, but also the machining of the propeller.

It looks like rough machining now, and that is also due to material performance issues. During the three-year natural aging process, the spindle weighing several tons was deformed by more than ten millimeters under the influence of its own gravity.It has been processed in time before, and if there is not enough processing allowance, it will even be scrapped because of excessive deformation after the aging is over.

"This is the level that can be achieved after several times of processing and alignment. In this case, the most severely bent place is only less than 3 mm of margin, and we are even worried about whether it is also corroded... …"

There is indeed a piece of white on the rotating spindle.

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

This is how the machining of heavy parts is done. There will be enough margin before the initial rough machining.

"In the beginning, there was no big press with a larger tonnage. Now Erzhong has a 70,000-ton press. If these spindles are forged with that, the performance can be improved a lot?" Liu Yijiu shook his head helplessly, and looked. The spindle is slowly rotating.

Qin Kun said with bright eyes, "Director Liu, we actually wanted to re-press this double 70,000-ton press before, but the reserved margin is not enough. If it can be produced in the next batch When using the double heavy press for forging, the service life can be increased by at least two times..."

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

The biggest headache now is the short service life.

Originally thought that the other party was deliberate, but now it doesn't seem like this?

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

"No, it's in the planning stage. At present, our main processing business is on the battleship. The entire workshop is for your supporting business, and the others are making 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 side of the heavy vertical car with a revolving diameter of five meters.

Looking along, it is indeed a large propeller.

"This is directly after the rough machining of the vertical turning machine, directly on the gantry milling machine, using the mold to manually process the above curve, and in the final finishing process, it is manually polished..." There is no heavy-duty turning-milling composite machining center to produce these huge The propeller can only take this way.

Liu Yijiu frowned, "Does our Ninth Institute have a large five-axis machining center?"

"Yes, it does exist. There is one at the 701 subordinate shipyard next to it. However, the stroke is not enough, and it is impossible to process this type of fast six meters in diameter..." Qin Kun shook his head helplessly."If there is a large machining center to process the propeller, form it once, and then perform the final grinding, this will reduce the stress a lot. The service life will become longer. Now it is because there is no, so we can only do this. Originally we hoped nine The hospital can help us get it out first, but the business of the Ninth Academy is already busy, and we currently don’t have enough funds..."

What Qin Kun said made Liu Yijiu silent.

He was considering whether he wanted to obtain a heavy-duty five-axis machining center and a heavy-duty CNC lathe from the Ninth Institute by himself, or just to explain the facts.

Regarding machining centers, the Republic obtained a lot of five-axis machining centers from the Japanese, and at the same time imitated them, and has formed a good research environment, he never went to ask these things again.

There are so many things for him to worry about all day long. Where can I know the specific situation of the equipment?

At least, the person in charge of the key project of the unit of the Ninth Academy did not ask him to say that the project was affected by the equipment.

The person in charge between the various units below communicates on their own.He didn't have so much time to get headaches for these trivial things.

The various tasks of the Ninth Academy will definitely not make way for these outside manufacturers.

"In this way, whether it is the main shaft or the propeller, the material problem is not the main thing, is the production process?" Liu Yijiu did not entangle Qin Kun's purpose, but asked him.

The attitude is much better than before.

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

"That's true. We used to be the best unit in the domestic shipbuilding industry, but in recent years, technological updates have been unable to keep up. After the military is converted to civilians, the development in this area is naturally not as demanding as the military industry's requirements. Therefore, apart from technical experience and reserves, technical processing capabilities are not good..." Qin Kun was a little lonely when he said this.

The Jiangnan plant's military orders are basically gone.

"Isn't your Jiangnan factory also responsible for the manufacture of the 052 ship? By now, the keel should have been laid, right?" Liu Yijiu suddenly remembered that the 112 ship of the Republic's 052 destroyer was manufactured in the Jiangnan factory. Up.

Under such circumstances, their technological upgrading should be very important.

Is there an accident?

Qin Kun nodded, "It's true. We originally participated in the design of the 052 project, but it was cancelled due to some circumstances. Later, it was said that the construction was not on our side. It was not confirmed until 1987 at that time. This June The keel has already been laid..."

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

The Ninth Institute of Numerical Control equipment is provided by the companies listed on the list. At the same time, some of them have to be supplied to the Soviet Union. The transactions between the two sides have not stopped for so many years.

"This is not something we know. Because of the importance, the leaders of our factory went to Rongcheng several times, but they were not in the production plan...With these advanced equipment, our production technology level can be improved a lot. "Qin Kun's words silenced Liu Yijiu again, "Director Liu, we also hope that Jiangnan Factory can always maintain its glory. It is not only a civilian product, but also a greater contribution to the cause of national defense!"