"Lao Liu, why do I think your design is plagiarizing our creativity." Lin Zhenhua sat down and whispered to Liu Xianghai.

Liu Xianghai was full of black lines: "Xiaolin, you can't rely on some spectrum for your nonsense, we are engaged in propellers, you are a fan seller, how can we stand it." ”

Lin Zhenhua said: "Lao Liu, I don't just sell electric fans, I also sell washing machines." Our waterfall washing machine uses the principle of water spraying, how do I think your water spray pump and the pump in our washing machine are the same thing. ”

Liu Xianghai smiled dumbly: "If you want to say this, it's really like that." To tell you the truth, we started to do water jet propulsion, or after we finished getting you a waterfall washing machine, we often proposed this plan to the office, which should have been inspired by you to a certain extent. ”

"Royalties are fought." Lin Zhenhua smiled and stretched out a hand.

Liu Xianghai gently patted Lin Zhenhua's hand and said, "You pull it down." The water-jet propulsion method was invented by the Englishmen Tugud and Hayes as early as the 17th century, but the earliest water-jet propulsion outboard was made by the Americans in 1946. In 1962, the Soviet Union first used a three-stage axial flow pump and a two-stage axial flow pump, and I was exposed to these things when I was studying in the Soviet Union. ”

"It's been so long?" Lin Zhenhua was depressed. When he first heard Chang Qingbo say about water jet propulsion, he was still a little excited, thinking that he had inspired Chang Qingbo, which led to the emergence of a new technology. Now it sounds like nothing is wrong with me.

"It should be said that you Xiaolin still has merit." Liu Xianghai comforted, "If you hadn't given 500,000 yuan to lure Lao Chang to study the water sprinkler system, they wouldn't have turned to this direction so quickly." Don't underestimate the axial water jet propulsion pump on the current picture, if it is done well, our country's high-speed ships will all rely on it. ”

The two of them were whispering here, and Chang Qingbo was already introducing the technical problems of the water jet pump. The principle of the water jet pump is not too complicated, and the propeller is engaged in this direction, and the theoretical design has been completed. However, in terms of processing technology, the problem is relatively big, so Liu Xianghai will go all the way to summon Lin Zhenhua and his entourage to Shangyanhai.

"We have no experience in the manufacture of this kind of pump equipment. Director Liu said that you Hanhua Heavy Industry has experience in the production of pump equipment, so please ask all the masters to come and give us some guidance. Chang Qingbo said politely.

Several people from Hanhua Heavy Industry glanced at each other, and Zhou Houcheng spoke first: "The shape of the cavity of your pump is too complicated, and the internal finishing is very difficult, so I am not too sure if I do it." ”

Peng Gang said: "Some processing work must be done with CNC machine tools, but it must also be equipped with special tooling and several sets of combined fixtures must be designed. If you just do one or two pieces, the cost is too high. ”

"When installing, you also need to have special tools, and the installation of this shaft, I think it is necessary to use a hydraulic sleeve legally, and you have to have a special high-pressure oil pump and diffuser, and it is difficult to install it in place by ordinary tools." Sun Changchang also put forward opinions from the perspective of a fitter.

"What are your considerations in terms of materials? The wear resistance and corrosion resistance requirements of the cavity should be very high, right? ”

"If you design a separate set of control software, the processing efficiency should be improved a lot, but can you meet the requirements of mass production at present?"

“……”

At first, everyone was a little cautious, afraid that it would be inappropriate, but then the more they talked, the more they entered the state, and they threw that cowardice out of the Nine Heavens Cloud. These workers and technicians all have a skill, and they have made some achievements in their own fields, and what they say makes the technicians of the thruster institute feel refreshing. Slowly, Chang Qingbo and others also joined the discussion, and the meeting room was full of people for a while, and it was very lively.

"Director Liu, the masters said it so well that it solved a lot of our confusion." Chang Qingbo squeezed out of the crowd, walked in front of Liu Xianghai and Lin Zhenhua, and said with his eyebrows fluttering.

"How about it, are you sure you can make a prototype?" Liu Xianghai asked.

Chang Qingbo said: "If these masters can give us some guidance, I think we will be able to produce the prototype." "How long does it take?" Liu Xianghai asked.

"I guess...... It will take a month or two, of course, we can work overtime, but I don't know if it is appropriate for the masters to work overtime. Chang Qingbo said.

"A month or two? Still working overtime? Liu Xianghai said with a frown.

Chang Qingbo said: "This is no way, the structure of the entire pump body is very complex, including turning, milling, boring, grinding, pliers and other processing methods. That Master Peng said that if you can make some special tooling, some operations can be greatly simplified, and the progress can be accelerated a lot. ”

The so-called tooling is a general reference, which means a variety of process equipment used in the manufacturing process, including tools, fixtures, molds, measuring tools, inspection tools, auxiliary tools, fitter tools, station tools, etc. Special tooling refers to equipment specially designed for a special product, which can make some of the work in the manufacturing process easier. For example, if there is a 10 mm round hole on the workpiece to be processed, if the worker uses a caliper to measure it after each machining is completed, it is very troublesome to measure it many times in different positions. If you can make a cylindrical plug gauge with a diameter of exactly 10 mm, then you only need to plug the plug gauge into the hole to see the degree of fit, which can greatly reduce the workload of measurement. This kind of customized plug gauge belongs to the special tooling.

Under the conditions of single-piece production, it is not economical to use special tooling. However, if the production batch is large, the use of special tooling can greatly reduce the cost and make the production quality more stable.

Chang Qingbo's entanglement lies in whether to make special tooling for this water jet pump.

"Then do it." Lin Zhenhua interjected on the side, "If you want to do a good job, you must first sharpen your tools." You don't just want to make a pump like this, do you? ”

"Of course not." Liu Xianghai said, "If our propulsion pump is successfully trial-produced, it can be installed on various ships such as missile boats, patrol boats, and reconnaissance boats in the future, and it is very widely used and it is entirely possible to meet the requirements of mass production." ”

"If that's the case, then it's worth getting a special tooling." Lin Zhenhua said.

Liu Xianghai smiled bitterly: "Xiaolin, you are now a big boss, you have a lot of money, and you don't have a backache when you speak." How can we have so much money to make special tooling? Do you know why I asked you to help, because we have to go to a big factory for this little work, and people don't want to take it at all. ”

"Won't it?" Lin Zhenhua said, "Last time I helped you sell frigates, didn't you make a lot of money?" I heard that you did a few more businesses later, and the profits should be good, right? Why, you have squandered all the money? ”

Liu Xianghai said: "There are more wolves and less meat, our navy has a lot to do, and the money earned from selling warships can maintain the daily operation of various research institutions." If the water jet propulsion pump is to be mass-produced, a new set of manufacturing systems is needed, and we can afford it. ”

Lin Zhenhua nodded, in the discussion just now, he and Liu Xianghai sat on the side, and they all listened to it sincerely, knowing that the amount of money to be invested in such a water jet propulsion system was very huge. First of all, it is necessary to have a full set of processing equipment, all kinds of vertical and horizontal lathes, milling machines, boring machines, grinding machines, some do rough machining, some do fine machining, adding up to a total of thirty or forty units. Secondly, it is the production or procurement of special tooling, and the price of some of these things is also very expensive. Finally, in fact, the problems of materials and heat treatment processes of the whole equipment have not been solved, and to solve these problems, a lot of experiments need to be done, and the cost is not less than the purchase of equipment.

If the thruster institute had only intended to build a set of such water-jet propulsion pumps, everything would have been simplified, and there are examples of this. In the 50s, China imitated the engine of Mercedes-Benz cars, first of all, precision casting, which could not pass. The final solution was to cast dozens of cylinders in the same way, and then pick one of the closest dimensions and use a file to beat it little by little until it fits perfectly with the prototype. It is said that the performance of the engine produced by this is similar to that of the original.

Relying on this method, the Chinese people have made many amazing products in the early years, and they have been worshiped as mastering more or less core technologies on the Internet of later generations. Actually, this is not a big industrial method at all, but more like a handicraft workshop approach. Craftsmen can carve a copy of the Dream of Red Mansions on a single hair, but you must not think that this means that China has mastered the technology of precision making, because it is not a matter at all.

"Lao Liu, according to what you say, you called us over just to ask us to make a set of water spray pumps for you by using ants to gnaw bones, and you take it to report the good news to Zhongyan, and then throw it into the garbage heap to rust?" Lin Zhenhua said half-jokingly. The so-called ants gnaw bones, which is the kind of manual method mentioned earlier, and it is a big deal to file with a file, and you can always make things.