Yunfei didn''t expect that the news revealed by Li Lu was actually like this.


    He really didn''t expect that North Korea should pay so much attention to him, the private boss of a small machine tool company from China. At least, at present, China has not paid too much attention to him.


    Yun Fei thought so, so he was a little angry.


    The state often gives him the green light all the way. Otherwise, the large number of machine tool companies in China alone will kill 91 heavy industry. Countries have always had the practice of technology sharing.


    Of course, this technology sharing means that the technology of private enterprises is shared to the state and those state-owned factories under the state asset management commission. If the state did not pay attention to it, the CNC machine tool technology of Jiuyi heavy industry was forced to share by large state-owned machine tool manufacturers such as northeast first machine and capital first machine as long as his CNC machine tool was developed.


    Even if he finally shut down the 91 heavy industry and burned the research data of the 91 heavy industry, it would be of no use.


    In scientific research, talents are the most important.


    No matter the workers from 9327 or the experts or technicians from the Soviet Union, they will definitely choose the country without hesitation in the choice between the state and his private boss.


    What he provides, the state can provide. What the state provides, he can''t provide either.


    However, Yun Fei does not know that the state attaches importance to 91 heavy industry. At least, at present, it has not risen to the level of obvious attention.


    The world knows the arrogance of the golden sun. That product calls itself "the most dazzling sun of the 21st century"! Otherwise, he would not be jokingly called the golden sun.


    North Korea has never thought of attaching importance to him.


    Perhaps, few people in China now understand the inevitable relationship between CNC machine tools and long-range missiles.


    After all, when the Soviet Union and China did not have CNC machine tools, they also produced strategic intercontinental missiles with a range of more than 8000 kilometers or even tens of thousands of kilometers. For example, the Soviet Union''s Poplar MD strategic missile (it is said that the range is 1400km, or 1250km), China''s JuLang II (liquid fuel propulsion, with a maximum range of 8600 km) and Dongfang 31a (solid fuel propulsion, with a maximum range of 10600 km) are all handmade by ordinary machine tools.


    It was not until more than ten years into the 21st century that a few people understood that the performance of missiles could be better guaranteed only by the various parts on missiles processed by high-precision CNC machines.


    Otherwise, China''s Dongfeng 41 will not get a breakthrough until there is a major breakthrough in China''s CNC machine tool technology.


    The breakthrough of NC machine tool technology involves many things, not only the improvement and innovation of processing technology, but also higher requirements for materials. Only after the improvement of materials can the production process be improved, so as to make a breakthrough in NC machine tools.


    The processing accuracy of the shell of long-range missile is not very high, but the processing accuracy of some spare parts inside is relatively high. For example, the flange of the fuel filler and the lining of the missile shell at all levels are not very demanding if only viewed from the drawings. Only when processing, can the processing personnel understand how difficult it is.


    Take the lining of all levels of shells connecting long-range missiles as an example. This requires at least four axis linkage machining centers.


    The domestic missile lining is not a whole ring, but a whole circle processed by lathe, and then cut into several arc parts by wire cutting according to the design requirements. Then drill holes for tapping (making threaded holes) on it, and finally rivet these linings with the perforated missile shell.


    In the preliminary processing, the processing requirements are not very high, but when the parts are divided into several parts later are drilled and tapped, the problem occurs.


    Many people know that the missile is basically a cone. Only in this way can it be more in line with aerodynamics and ensure stability in the flight process. If the stability of the flight process cannot be guaranteed, even if the range of the produced missile can meet the design requirements, the accuracy range cannot be reduced very small. Therefore, in China and the Soviet Union, two countries without CNC machine tools, the accuracy range of the missile is very accurate if it is within 100 meters of the target.


    In the United States and Europe, many missiles have a range of 3-5 meters.


    Many people believe that this is determined by the missile guidance technology.


    Those who are not professionals know that the stability of the missile during flight also has a great relationship.


    These things are some very professional knowledge. Yunfei knew it because their company had some business contacts with aerospace at that time. After entering the 21st century, most of the finishing workshops and equipment of aerospace were replaced with CNC machine tools imported from abroad.


    You know, these imported CNC machine tools are worth hundreds of millions of yuan!


    These equipment were only added to produce various missiles with more accurate attack range.


    There are at least two angles on the lining, one is the angle along the diameter direction of the part arc, and the other is the direction perpendicular to the part outer circle or inner hole (this angle is relatively small and generally will not exceed five degrees). This makes it difficult to ensure the machining accuracy of parts when machining on conventional machine tools.


    For four axis CNC machine tools to make such parts, the requirements for the operation level of skilled workers are too high. They are not at the master level. The scrap rate of processed parts will basically exceed 90%. Even if they are made by the master, the scrap rate can only be controlled at 80% to 70%.


    And the processed products are only barely usable. In that way, the design accuracy requirements of the missile can not be met at all. The machining accuracy cannot be guaranteed, which will lead to the uneven distribution of screws or rivets at the connection of the missile shell or the place where the rocket engine is loaded at the tail of the missile. Although these qualities are very small, they will be greatly placed in the process of high-speed movement at high altitude, affecting the stability of the flight process.


    Only high-precision five axis CNC machine tools can complete the processing of these parts.


    Only the parts processed by five axis linkage high-grade CNC machine tools can ensure the design accuracy.


    China''s development of strategic missiles has always been very mysterious. Because foreign countries rarely know when China will conduct missile test.


    Civil launch vehicle technology is almost no different from military intercontinental strategic missile technology. China''s long march series belongs to civil rockets, which are designed and produced to send satellites to heaven.


    If in the course of war, with a small amount of modification, the civilian long march series missiles can quickly complete the transformation from civilian to military.


    Only with more powerful rocket technology can the nuclear deterrence capacity of nuclear weapon states be expanded to the maximum.


    If one day China''s land-based missiles can cover any corner of the world, even if the United States has a navy that can cover all the sea areas on the earth, it will not be enough.


    North Korea has been conducting a secret nuclear test, but it has not been known to the outside world.


    Of course, the Soviet Union was very clear about these tests.


    With the disintegration of the Soviet Union, North Korea''s experiments fell into difficulties.


    What Yun Fei doesn''t understand is that since the establishment of diplomatic relations between China and South Korea in 1992, the relationship between China and North Korea has dropped to the freezing point. Why does North Korea take the initiative to come to China for assistance at this time and favor itself as a Chinese private entrepreneur.


    Do they think that with CNC machine tools, their nuclear test can make greater progress?


    Or do you think you can get your own CNC machine tool technology if you get your own CNC machine tool? Then can we develop more advanced four-axis or even five axis CNC machine tools?


    The relationship between countries, Yun Fei does not want to understand, nor does he want to understand. These things are not what little people like him can understand.


    "Did they really take pictures?" Cloud Fei has a deep feeling about all kinds of events on the network in the future.


    He did not expect that one day, he would become the protagonist of such a door event.


    The shamelessness of North Korea''s top leaders is recognized by the whole world.


    Is it Jin yipang or Jin erpang who does this?


    Jin Er Pang is not dead yet!


    I don''t know if the goods will live a few more days because of their appearance.


    "What do you think?" Li Lu smiled meaningfully at Yun Fei.


    For such things, her heart is very tangled.


    I hope Yunfei will do this, so that something happens between her and Yunfei, so that she won''t feel guilty; In my heart, I am very dissatisfied with Yunfei''s doing this. Such a man is too unfaithful!


    "..." cloud is not speechless.


    Nima, if he was really threatened by a country with his nude photos, he would be as famous as the tombstones in front of many ancient tombs.


    If so, should he be proud? Or should we be proud?


    "Does the North Korean side really think that if they get me, they can get what they want?" For things at the national level, Yun Fei, who has never been in contact with politics and is not ready to be in contact with politics, really doesn''t understand.


    "Who knows. But I think they mainly want to ease their relations with China. After the disintegration of the Soviet Union, the only thing North Korea can rely on is China. After the establishment of diplomatic relations between China and South Korea in 1992, the relationship between the two countries fell to the freezing point. When the capital bid for the Olympic Games last year, our country''s bid for the Olympic Games was not successful because of North Korea''s negative vote. Kim yipang''s Japanese children are few, and he is preparing for his transfer of power... "Although he is not very clear about politics, However, Li Lu knows very well about the situation in North Korea.


    These days, she is not idle.


    She has her own source of information.