The rise of Dongchen SC1 did not really make the senior management really excited, and the most exciting thing for the senior management is the high-precision machining center of Dongchen in a state of high secrecy, since Zhang Wenhao made the machining center of Dongchen to the high-level, the high-level has been getting a large number of OEM needs from the military and aerospace fields, it seems that because they know that Dongchen has the world's top high-precision processing capabilities, all military enterprises want to follow the light.

Summarized to the hands of the various needs, the total has exceeded more than 400, some of the needs are significant and imminent, such as the high finishing of aerospace engine parts, etc., while some needs are inevitably laughable, such as small arms manufacturing enterprises, trying to let Dongchen process several different specifications of the barrel and barrel rifling, in order to improve the shooting accuracy, range and power of various firearms.

This kind of demand can be said to be very ridiculous, all guns are not more than 10 million, if each one needs high-precision customized production, then Dongchen this machining center has been working non-stop for a hundred years, and it may be difficult to process all the barrels required for all the guns in service, even if the barrels of high-precision processing really have such high precision, its significance is difficult to apply to mass production.

In the end, the top management gave an objective priority, and Chapter 322, which is also the most critical mitigation, whether it is nuclear power, or diesel-electric power, ultimately has to form thrust through the propeller, and for sonar detection, the largest source of noise for the submarine in the water is also the propeller, the aerodynamic shape of the propeller, which not only determines the noise during operation, but also determines the maximum utilization rate of power, which can be said to be extremely high-end national defense technology, as far as strategic nuclear submarines are concerned, the three parts are the most critical, In addition to nuclear reactors and submarine-launched missiles, they are propellers, so the shape of submarine propellers in developed countries has always been classified as top secret.

Immediately, Director Liu took out a special USB flash drive and an ultra-thin laptop from the box, and then handed the USB flash drive to Zhang Wenhao, and said: "All the detailed data is here, if you understand, you can take a look at it first." ”

Zhang Wenhao nodded, and just wanted to get his own computer, Director Liu hurriedly said: "Don't take the computer, use my computer first, this one does not have the function of connecting to the Internet at all, it is safer." ”

Zhang Wenhao smiled helplessly and said: "This thing, you should treat it as top secret, it is indeed of great significance, but in our current situation, there are nuclear submarines." It's better than what we build, there are no nuclear submarines, and it's not much use to take our information, just in terms of propeller manufacturing technology, the United States, Japan, Russia, Britain, France and Germany are much stronger than us. ”

Although it was said as if it was a joke, Zhang Wenhao still ended up with Director Liu's laptop. After turning on the computer, Director Liu plugged in the USB flash drive and first scanned the fingerprints at the end of the USB flash drive. Then in a security software in the computer, I entered a long and complicated password, and then opened the file in the USB flash drive.

Zhang Wenhao roughly looked at a few detailed drawings. It was found that these three designs are all seven-leaf designs, and as far as the information in the super learning system is concerned, the current top manufacturing process is eight-leaf or nine-leaf, and the Ohio-class strategic nuclear submarine, which has the largest number of active numbers in service in the United States, adopts the eight-bladed propeller design, and the latest new model that is about to be finalized should already be a nine-leaf design.

Zhang Wenhao asked in surprise: "Why do we still use the seven-leaf design for our latest nuclear submarine?" Isn't that a bit outdated? At the very least, you need Yaba, right? ”

Director Liu smiled helplessly: "This thing is not so simple, it doesn't mean that eight leaves are eight leaves." As far as the current seven-leaf design is concerned, we have spent a lot of manpower and material resources, and we have calculated again and again, manufactured again and again, and tested various data again and again, and the size, thickness and angle of each blade propeller have changed slightly, and the result may be heaven and earth. Especially the tilt angle,There is a deviation of 0.1 degrees,The noise will be much louder,The design of the seven leaves has been relatively mature,The eight leaves design has been tried many times,Until now, no design can be close to the current seven leaves level。 So,I can only choose the seven leaves for the time being.。 ”…,

Zhang Wenhao sighed lightly and said, "It's really not an ordinary difficulty, you have to face such a big problem to build a propeller." ”

"Not really!" Director Liu also looked helpless, and said: "You see, the gap between this submarine propeller and the propeller of the surface ship is too big, the propeller of the surface ship does not need to spend so much effort to design and manufacture, it doesn't matter if the noise is louder, anyway, the noise of the surface ship is not a big problem at all, even if the thrust utilization rate is a little lower, the surface ship is large in size and space, and it can make up for a little defect in the propeller from the engine, but the submarine is different, and its own space is very precious. The power configuration has reached the maximum, the resistance in the water is also large, the speed is slow, the most important thing is that the key problem of the submarine to maintain survivability is the size of the noise, in this way, the submarine's requirements for the propeller, it is too high and too high, it can be said that the world, but wherever the propeller is used, the submarine propeller is the manufacturing process, the highest scientific and technological content, there is no one. ”

Speaking, Director Liu said: "We also know that Dongchen's manufacturing process is very strong, and the nine-leaf and eleven-blade propellers of Western countries must be able to be processed by Dongchen, but we have no drawings, which is the biggest problem, just the technology of the seven-bladed propeller, we have been tinkering for 20 years, and finally we have basically mastered it after buying the Russian Kilo class." ”

Zhang Wenhao nodded, thinking to himself, with Dongchen's high-precision processing strength and the information in the super learning system, Dongchen is fully capable of manufacturing the top eleven-blade large side-inclined propeller, and the drawing problems that plague the military are not a problem at all in Zhang Wenhao's place

Thinking of this, Zhang Wenhao said: "Director Liu, please convey to the leaders on my behalf that Dongchen will not produce the old and imperfect seven-bladed propeller according to this set of drawings, I will apply to the team to strive to get better technology, and I also guarantee that the propeller produced by Dongchen will inevitably be better than the military's design." ”

Officer Liu was speechless in shock, and only after a while did he mutter, "Isn't it?" Your team has also mastered the manufacturing technology of submarine propellers? ”

Zhang Wenhao smiled slightly, and said noncommittally: "I'll consult, although I'm not sure, I don't think it's a big problem." ”

Director Liu knew that Zhang Wenhao rarely or almost never said something he was not sure of, and when he heard Zhang Wenhao say this, he was very surprised, but he was also surprised: What kind of existence is the team behind Zhang Wenhao? They can build the best cars, the best materials, and now, they even have the core military technology, which seems too incomprehensible, right?

At this time, Zhang Wenhao said again: "The machine tool equipment of Dongchen machining center can achieve a maximum processing diameter of about ten meters, but the biggest problem at present is that Dongchen still lacks professional supporting devices, such as hoisting and fixing equipment for large propellers, which need to trouble you." ”

Director Liu nodded and said, "This is all a trivial matter, and it can be solved within a day." ”

Zhang Wenhao asked again: "What about the materials?" Still using No. 036 special copper alloy? ”

Director Liu said: "Yes, at present, the material technology we have mastered, only this material is most suitable for manufacturing submarine propellers, copper alloy will not rust, it can be more corrosion-resistant on the seabed, and it can also withstand the bubble corrosion generated during propulsion, and among all copper alloy materials, it is the No. 036 special copper alloy with the best performance." ”

Zhang Wenhao nodded and smiled, and said: "According to the size requirements above, the tonnage of the new submarine should be at least 9,000 or more than 10,000 tons, right?" ”

Officer Liu laughed and said: "Even you are half an expert, Comrade Xiao Zhang, although it is not easy to disclose too much, but you guessed correctly, it is indeed more than 10,000 tons, if Dongchen's technology and processing capabilities really have very good performance, then the military will definitely entrust Dongchen to produce propellers for low-tonnage conventional submarines." ”…,

As he spoke, Director Liu asked again: "You have a deep knowledge of materials, is there a more suitable copper alloy for making this kind of propeller?" ”

Zhang Wenhao said with a smile: "It doesn't mean much, no matter how strong the copper alloy is, it can't go beyond the category of its own copper alloy, if it is really about strength, it should be steel alloy; On lightweight, titanium alloy; If you talk about corrosion resistance, the alloy material is not as good as the high-end epoxy resin, but the latter is now only suitable for surface ships, for submarines, the technology is still a little immature, the biggest problem at present, is the problem of its own design and manufacturing process, with 036 copper alloy is no problem, as for epoxy resin, in the future, if Dongchen gets involved in this industry, with more advanced products, it can naturally be updated. ”

"Hmm." Director Liu nodded and smiled, and said: "Then this matter, please leave it to you, the corresponding auxiliary equipment and materials, I will be prepared in the next two days, and it will be shipped to Jiangcheng at that time. ”

At present, the best manufacturing process in China can reach 0.025 mm, that is, 25 microns, while the manufacturing accuracy of Dongchen has reached 0.001 microns, and the accuracy of 1 micron required by the military is very easy for Dongchen. (Your support is my biggest motivation.) )