Heard Yang bingbiao say that this one meter long lathe guide rail has reached level 3. If you give them time, not even level 2 or even level 1 can be achieved under the most common basic tools such as simple scrapers, files and sandpaper oilstones!

    The more advanced machine tools are, the fewer they exist in this world.

    In the world of Yunfei, it is estimated that there are not many metal processing machine tools with an accuracy level of more than two in the whole earth. Not only because these are made by the oldest manual way, the price of machine tools is unacceptable, but also because there is not much need for super precision machine tools in these super precision machine tools on the whole earth.

    The parts produced are used to assemble with other parts. If the parts really reach the accuracy of more than level 3, it will be difficult because the gap at the assembly place is too small. Of course, it becomes more and more difficult to adjust the assembly clearance of the system.

    "Now that the machine bed has been processed, prepare to transfer it to the assembly workshop." Yun Fei saw that there was almost no trace of processing on the machine tool. The inverted V-shaped convex part and plane part of the jump guide rail were like a mirror, which could vaguely reflect people''s shadow.

    For the guide rail with three-level accuracy, the straightness is within 0.008mm, and the flatness is also within this tolerance. Of course, the parallelism will not exceed a trace. The V-groove and plane installed under the bed saddle above the guide rail for assembly with the guide rail are the same accuracy.

    Yun Fei knows that at the beginning, these parts were not assembled, but scraped separately. Finally, when the size is about to arrive with various tools, the accuracy level is at least close to level 4. The workers will overlap the assembly positions of the two parts and grind them back and forth on the guide rail with the bed saddle driving the tool holder to move.

    Because the hardness on the guide rail plane is very high, especially when both planes are very smooth, it is not easy to wear the matching plane by pushing the bed saddle on the machine tool guide rail to grind back and forth. Therefore, the bed saddle with only tens of kilograms must be counterbalanced. Under the reuse of gravity, the two planes rubbing against each other will become more flat and smooth. Of course, the counterweight added to the bed saddle and the gravity added to the bed saddle must be balanced, otherwise the flatness of the ground matching plane cannot meet the requirements at all.

    On the machine tool, there is not only the guide rail and the bed saddle installed on it to drive the tool holder to move, so as to achieve the highest accuracy. The tool holder is not directly installed on the bed saddle, but there is a middle support plate on the bed saddle for longitudinal movement with the tool holder. The bed saddle moves laterally with the tool holder, and the middle support plate drives the tool holder to move longitudinally. When the transverse movement and longitudinal movement are carried out at the same time, the moving track of the tool will be an oblique line or an arc.

    The oblique movement of the tool is used for turning the conical surface; When the track becomes an arc, arc cutting is carried out.

    The manual operation of workers is difficult to achieve uniform change and movement in two directions, but this problem does not exist in CNC machine tools. The production of CNC machine tools is not used to produce large quantities of parts at first, but to process various complex movements that are difficult to meet the requirements of these manual operations.

    It is also the Ninth level fitter with the best technology of Jiuyi heavy industry, but the workshop is not a precision machining workshop, but a dust-free workshop that has not been opened since its completion for the final assembly of CNC machine tools. In fact, this dust-free workshop is not a real dust-free workshop, but the whole plant is basically sealed. Except for some windows for ventilation, most other windows are tightly closed.

    At this time, there was no large-scale central air-conditioning production in China. If the plant with thousands of square meters wanted to reach the constant temperature condition, the central air-conditioning must be customized abroad. The price was simply not affordable for the current cloud.

    In the workshop of thousands of square meters, there is a lathe foundation equipped with bed feet, bed body and spindle box. Under the leadership of Yang bingbiao and goodrian, four or five level nine fitters in white coats, aged 40 or 50, orderly loaded various spare parts into the spindle box of the lathe.

    "Be light, don''t assemble it as an ordinary lathe..." at the assembly site, Yang bingbiao''s heart was about to fall out when he saw those old maozi foolishly assembling.

    You know, these parts are at least one level higher than those of ordinary lathe parts. Some main parts in key positions even reach level 5 accuracy.

    None of the workers here has assembled a lathe with such a high precision level. Of course, they have not assembled a CNC lathe.

    Yun Fei originally wanted to go to other machine tool manufacturers to dig one or two nine level fitters with NC machine tool assembly experience, but those people were provided as treasures in their factories. Those factories would not be foolish enough to give their masters to their competitors. It was said that Zhao Xingbang had a close relationship with the director of the northeast first machine tool factory. Yun Fei wanted to get one or two from the northeast first machine tool factory through Zhao Xingbang. Before he said anything, Zhao Xingbang hung up Yun Fei''s phone.

    Finally, the director of the first machine tool factory in Northeast China directly called Yunfei and threatened him. If Yunfei tried to dig into the minds of the master of their factory, he would do anything to pull the engineers and various senior workers that Yunfei had worked hard to get back from the Soviet Union to his factory.

    Yun Fei knows that the threat of the goods must be taken seriously. The first machine tool factory in Northeast China is the largest machine tool manufacturer in China. In the world of Yunfei, at that time, the annual sales of CNC machine tools was close to US $10 billion. Coupled with the title of national brand staring at the head and directly under the Central Machinery Department, now even the workers are not their own Yunfei. How can they compete with such a big Mac?

    "Align the hole in the middle of the gear with the shaft. There is less than a gap. If it is crooked, it can''t be installed. This is not to assemble ordinary lathes. It''s not a good thing to turn around. There''s nothing to do when it comes to a copper bar. "As the boss''s Yun Fei, Yang Bingbiao, the workshop director of the assembly workshop, came to the factory to assemble his first CNC machine tool. He was a young boss who knew more about CNC machine tools than any of them.

    "Xiao Yun, apart from a frequency converter installed on the spindle, it''s no different from an ordinary lathe, isn''t it?" When they first saw the assembly drawings, Yang bingbiao and others were full of doubts, but Yun Fei didn''t explain to them, so they could only hold it in their hearts.

    Now after the spindle of the lathe has been installed, it is found that the gear in the headstock of the first CNC lathe produced by 91 heavy industry is no different from other 6140 lathes! The only difference is that a fist sized frequency converter is installed at the tail of the spindle of the lathe, which is said to be used to control the speed of the lathe.

    This puzzled Yang bingbiao and the senior assemblers from the Soviet Union. Since the frequency converter used to control the speed of the main shaft is installed, why should so many gear sets be installed? Why does the manual fork used to control the lathe speed still exist on the lathe?

    "The headstock is actually the structure of an ordinary lathe!" Yun feiran''s words made the people who were carefully assembled depressed.

    "Although it is the headstock of an ordinary lathe, there are still some subtle differences. You are all teachers. Don''t you find that in this way, the speed change of the machine tool can be changed manually or infinitely within the gear. Although there are more than 20 kinds of speed changes on the ordinary lathe, the difference between the two speeds is too large, especially in the high-speed gear, the difference of each gear is at least hundreds of revolutions. For many material processing with high linear speed requirements, the speed of the ordinary lathe can not reach the most reasonable... "Yun Fei explained to the crowd.

    At the beginning of the design, engineers in the Soviet Union thought that Yunfei, a layman boss, was giving a blind command. Since he could get a frequency converter and manufacture a CNC lathe with stepless speed change in high, middle and low gears, why add a shift fork with manual speed change. However, when the mathematical model was later established for analysis, it was found that compared with the NC lathe with stepless speed change in more than 20 gears, although there is no difference in speed, the rigidity is not a little bit.

    After the gears in the headstock are installed, there are only ball screws, stepping motors that control the displacement of the machine tool, and the control appliances of the machine tool. Finally, after connecting the PLC independent controller that is larger than a 20 inch TV and has only a palm on the display, the assembly of the first CNC lathe of 91 heavy industry is completed.

    Whether there is any problem in the assembly can only be found in the process of trial processing. The machining accuracy of the machine tool can only be reflected in the machining results after the parts used for machining are completed.

    Most of the circuit design of this CNC machine tool is completed by Yunfei himself. Even if the electrician connects the independent PLC controller of the machine tool to the electrical box of the machine tool, the final assembly is completed.

    As early as the beginning of production of Jiuyi heavy industry, Yunfei mobilized 20 sets of CNC systems for lathes from Huadu CNC, as well as the supporting ball screw and stepping motor, which are the most critical CNC machine tool accessories, to Chengdu. He wanted to use the servo motor, but the servo motor was not only difficult, but the price was too expensive. A servo motor costs thousands of dollars!

    Now this CNC lathe, which carries the dream of everyone in each workshop of the whole Jiuyi heavy industry, has finally completed the final assembly.