Under Li Lu's dissatisfaction, the meal was quickly served.

Zhao Xingbang and several people were aroused by Yun Fei's words, and they had no appetite for the full table of meals, and only hoped that Li Lu, Ren Zhiguo and Yun Fei, who were gobbling it up, would finish this luxurious light meal quickly, and then find a place to talk for three or five days.

For Li Lu, Zhao Xingbang also knows best. In addition, the current place is not suitable for a few people to talk about this matter. So after the meal was served, no one talked about it anymore.

Originally, Ren Zhiguo wanted to drink with Yun Fei, but when he asked the waiter to serve wine, he was stopped by Zhao Xingbang, and Ren Zhiguo could only give up this idea depressedly. In front of Zhao Xingbang, a stern old man, he really didn't dare to be presumptuous.

The meal without drinking was over quickly. Li Lu confessed to Zhao Xingbang and several old men, and said that he had made an appointment with a friend to go shopping, and he slipped away. Ren Zhiguo also wanted to slip away, but he was stayed.

The waiter took a few people to the private room of the teahouse on the fifth floor to make tea for a few people, and was driven out by Zhao Xingbang.

"Xiaoyun, how about you talk to us in detail now?" Zhao Xingbang no longer had the kind of calmness as a superior at this time, and as soon as he drove the waiter out of the city, he said anxiously.

"Uncle Zhao, don't you suspect that this hairy kid is bragging now?" Regarding Zhao Xingbang's performance, Ren Zhiguo, who had always been excited about this old man who came out of the pile of dead people. From childhood to adulthood, no matter what happened, he could deal with it calmly, and the old guy who was beaten as a villain and locked up in the cowshed did not have the slightest change in his face, but he was like a prostitute who saw the famous prostitute of Chaosi's dream, he was impatient, how could he not have the feeling of turning over!

"Go, go, go, while staying and drinking tea, adults talking, you kid don't interject......" Zhao Xingbang stared at Yun Fei with a monkey on his face, and waved his hand at Ren Zhiguo, who was coaxing.

"......" Ren Zhiguo was speechless, and Yun Fei was equally speechless. Once upon a time, Lao Ren, who was more than ten years older than himself, became a child, and he, a child in the eyes of everyone, became an adult?

"Director Zhao, as for the parts you need to process, I just took a general look at it, and mentioned to Lao Ren, the processing of those parts may not meet the requirements." Yun Fei was a little embarrassed by the eagerness of the old man in front of him. At this time, the fear of the old man in my heart was gone.

At the beginning, in order to fool Ren Zhiguo, a guy who didn't understand CNC machine tools, he said everything very simply. After thinking about it for so long, I realized that the plan I proposed could be processed to that kind of accuracy in theory, but in practice, it could not be guaranteed at all.

The difference between theory and practice is caused by many hardware conditions. For example, the accuracy of the stepper motor and the ball screw determines the control accuracy of the numerical control device. The domestic lead screw may be able to achieve, but the four-axis linkage machine tool, the stepper motor is difficult to control the linkage of the four axes, and the accuracy is simply not guaranteed.

Therefore, the four-axis linkage machining center must be controlled by a servo motor. For servo motors, it is necessary to have a position detection device and a device that transmits a pulse type. The delay of the feed pulse signal, the precision of the position detection device, the error of the feedback pulse, etc., are all insurmountable mountains in the early stage.

"How?" Ma Ji didn't believe that Yun Fei was such a small child who could know more than those of them who had been engaged in CNC machine tools for more than ten years, but seeing that his superiors didn't say anything, he could only faintly express his dissatisfaction.

"It's me who thinks about this too simply. Since the old Ren left, I have been thinking about how to realize the problem of adding a PMC shaft module on the three axes to implement the function of the fourth axis. What can be obtained in China is basically a stepper motor, and the indexing control of the stepper motor and the rotary workbench depends on the accuracy of the stepper motor itself, which affects the indexing accuracy of the workbench in the processing process...... "Yun Fei saw the blank faces of several people, so he stopped and waited for the digestion of several people.

"Xiaoyun, according to what you mean, wouldn't it be better for the stepper motor to be directly connected to the transmission device of the rotary table?" A middle-aged man with glasses and about forty-seven or eighteen years old asked suspiciously. For CNC machine tools, although no breakthrough has been made, the engineers brought by Zhao Xingbang are still familiar with the understanding of these basic technologies.

"Who is this?" Before eating, Ren Zhiguo only introduced a few people brought by Zhao Xingbang as an assistant, and Yun Fei really couldn't stop what to call them.

"My name is Zhang Jun, and I am the ...... in charge of the transmission work" Zhang Jun didn't care at all about Yun Fei's ignorance of his name, not to mention that Ren Zhiguo deliberately didn't introduce it at the beginning, even if he introduced, Yun Fei couldn't remember it, and he could only blame himself for not having the ability. After all, I have been studying this for more than ten years, and I am not as good as a young man......

"The operation of the stepper motor is controlled by pulse signals. The pulse signal frequency controls the speed of rotation, and the pulse signal controls the rotation angle of the motor. It is not impossible to control the rotation accuracy of the fourth axis by controlling the pulse signal, but it requires an industrial control chip with powerful control functions. The industrial control chip not only needs to be able to control the operation of the fourth axis, but also control the linkage between the remaining three axes and the fourth axis. Yun Fei explained.

"Industrial control chip ......" Zhao Xingbang, Ma Ji, and Zhang Jun sighed at the same time. A face full of loss.

"You should be clear about the distribution of CNC machine tools according to the control method, right?" Yun Fei sighed at a few people, and his heart was also uncomfortable. Changed the subject.

"Well, we really don't know." Regarding Yun Fei's question, Zhao Xingbang blushed a little.

All along, they have been researching machine tools controlled by stepper motors, after all, this is simple. Servo motors, they know that foreign high-precision machine tools and large heavy-duty CNC machine tools have begun to eliminate the use of stepper motors. However, the domestic foundation is too weak, and they don't even understand the stepper motor, how to distract from the high-precision CNC machine tool controlled by the servo motor!

There are now many research institutes and machine tool companies in China engaged in this research, but after so many years, we have not heard who has made breakthroughs.

"According to the control mode, the CNC machine tool control system is divided into three categories: open-loop, closed-loop and semi-closed-loop. Except for the drive and control of the open-loop system, which is realized by a stepper motor, the other two need to be controlled by a servo motor. The open-loop system is said to control the actuator by a power stepper motor or an electro-hydraulic servo motor. The control accuracy is directly dependent on the accuracy of the motor and the screw, but the lack of a position detection device limits the accuracy and speed of the motor, although it is stable and easy to grasp. Yunfei began to eradicate the literacy of a group of people who have studied CNC machine tools for more than ten years.

These most basic things, put in 20 years, even a secondary school student majoring in numerical control, can be clearly answered.

"Closed-loop control system with position detection devices on top of the moving parts of the machine. Not only high precision, but also high speed. As for the semi-closed-loop control, it is to install the position detection device at the end of the transmission screw rod, and indirectly measure the position of the actuator, which is not only convenient for debugging, but also has good stability, and is mainly used for ......" Yun Fei is like a technical school theory teacher, gushing to several people to explain these most basic things.

After explaining the basics of literacy, Ren Zhiguo had already curled up on the rattan chair and fell asleep with saliva. A few older students were taking quick notes.

"This, Xiaoyun, let's talk about the four axes now, shall we?" Zhao Xingbang now has completely lost that domineering momentum, and begged Yun Fei pitifully to ask.

For what Ren Zhiguo relayed, he already completely believed it. As for whether it can be done, it is only a matter of time.

There is also the biggest problem is the identity of Yun Fei's kid. The better Yun Fei performs, the more disappointed Zhao Xingbang becomes, after all, the research of CNC machine tools is still in the confidential stage in China. Although the research thing is very low-level in the eyes of the young man in front of him, it can't just be put in front of Yun Fei, or bring Yun Fei to the research institute.

In China, since 58 years, the Department of Mechanical Engineering of Huaqing University and the first machine tool factory in the capital began to engage in CNC machine tools, and there are many enterprises that have risen a CNC machine tool wind, but it is stillborn due to various problems. In addition to the great upheavals of the following decade, many people who studied this area lost their news.

Yun Fei understands this kid, Zhao Xingbang dares to doubt in his heart that there will definitely be a powerful private research team behind this guy, and their progress has surpassed that of the vast majority of people.

But is it possible?

Thinking that Yun Fei is young, he not only has the ordinary machine tool operation skills that amaze those masters, but also is especially good at the processing of CNC machine tools. Under the banner of doing foreign trade processing, Camat has a lot of high-precision parts that are processed by Camat's company, and I heard that Yun Fei is a young man.

"Xiaoyun, if we provide full support, how long do you think it will take to get the fourth axis that is added?" Zhao Xingbang did not take notes. His responsibilities and not only technical skills, but also the urgent need for a four-axis machining center, he now has to temporarily avoid the issue of Yun Fei's identity.

"If the technical personnel are sufficient, the materials can be guaranteed, and the capital chain is continuous, there should be no problem within three years." For the unidentified military person in front of him, Yun Fei didn't dare to say it too much.

"Three years...... How much money is needed? Although it is a long time, it can still afford to wait, and the question of how much money is needed now is what Zhao Xingbang is most concerned about. The focus of all domestic research is tilted towards economic construction, and the shortage of military spending in the military is well known, and if too much research funds are needed, they can only be shelved.

"At least seven or eight million are needed......" Yun Fei's words made everyone gasp.

Seven or eight million, all the CNC machine tool research in the whole country together, I don't know if there can be such a number.

"Xiaoyun, should you be the director of a CNC machine tool research institute?" Zhao Xingbang's heart sank to the bottom. For Yun Fei such an excellent talent, especially for the understanding of CNC machine tools, he doesn't want to give up, first pull people to the research institute, and then slowly do it, there will always be a day. So, he said something that shocked everyone.

Recommend a friend a new book "Chaos War Soul Formula" Everyone knows that it is not easy for newcomers to write, if everyone has nothing to do, if you like it, just help a little.

For mobile phone users, please read it on m.biquge.info.