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Chapter 46 Installation and Debugging

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    No wonder Teacher Tang and the others were so unsure. It was because the lathe transformation project hosted by Guan Fei had taken too big a step, which made them a little worried.  Technology is always improving, and domestic companies also need to make some technological improvements from time to time, but most of the investment is only a thousand yuan.  If Guan Fei invested 6,000 yuan in a single machine tool at a time, it was almost a gamble. If the technical reform was unsuccessful, the person in charge would have to bear important responsibilities.  Of course, Guan Fei himself is the top person in charge of the 291st Brigade. Even if the technical transformation fails, no one can hold him accountable.  But from the perspective of Teacher Tang and others, this is a great success.  The theory is great, but no one dares to be too optimistic about whether it can actually be done.  One thing they admit is that Guan Fei is indeed very courageous.  This time the C616 was modified into a CNC lathe, involving several key components including the power system, transmission system, tool advance and retract system, and tool change system. It can be said that the original C616 was gutted, completely disassembled, replaced with new parts and then reassembled.  A new lathe.  "The assembly of the automatic knife-returning system that Guan Fei first carried out was an eye-opener for theorists like them.  "The following is the assembly of the tool changing system. This is a very detailed job and requires full concentration. I have to focus on my work. I cannot answer your questions for the time being. I also ask all teachers to stay quiet so that I can concentrate all my attention." Guan Fei said  Before starting, I said hello to everyone.  Afterwards, he ordered all the parts one by one, placed them in front of him, then closed his eyes, as if he was adjusting his breathing.  Guan Fei¡¯s behavior also made Teacher Tang and others who were watching the study look solemn, and they involuntarily lowered their breathing to avoid disturbing him.  They noticed that as Guan Fei gradually adjusted, his breathing became more stable, and the intervals before and after became more consistent.  Two or three minutes later, Guan Fei slowly opened his eyes, and then began to assemble the scattered parts into a whole.  In the eyes of Teacher Tang and others, this process feels very slow, and each step takes several minutes.  Moreover, Guan Fei's body movements seemed to have become quite stiff. The speed and amplitude of his movements were like a machine, smooth and consistent!  "What a steady hand! Even a machine is nothing more than this!" Although they did not dare to make a sound, they all expressed such admiration in their hearts.  Affected by this, they suppressed their breathing even more, and some even covered their nostrils with their hands, as if they were afraid that a slightly larger airflow would interfere with Guan Fei's movements.  But this is a bit too slow.  Do they think that assembly is nothing more than putting a bunch of scattered parts together, and then using measuring tools such as vernier calipers to compare the assembly errors and make appropriate adjustments?  But Guan Fei is not like this.  He assembles each part very slowly, and the range of movement is very small.  Tiny adjustments were made before the parts were spliced ??into place, and once assembled they were kept as pristine as possible.  When fixing, his action of tightening the screws is also very special. Instead of tightening one screw and then tightening the second one, he tightens this screw twice, and then switches to the next one and tightens it twice as well. Applying force evenly at several corners, gradually  fixed.  In the last few turns, his movements became slower and slower. Sometimes he would turn one turn here and half a turn diagonally.  Or if it feels tight here, he will relax a little.  It was a simple fixed job. He kept adjusting it back and forth, and it took him almost ten minutes to complete.  During this process, he was always aloof, focusing entirely on observing the subtle changes in the parts in his hands, without being affected by the outside world at all.  There are only a dozen parts, and Teacher Tang consciously makes them by himself, which only takes about one or two minutes. If you are a craftsman, it only takes five or six minutes at most.  It took Guan Fei half an hour!  "Okay!" Guan Fei finished the last step and carefully put the assembled knife holder aside. He immediately relaxed, and the internal organs that had been stably controlled by the skin suddenly began to operate independently. Sweat wiped the floor.  The sweat glands on the head and face surged out, like water washing, and instantly flowed all over the head and face.  Teacher Tang and others were stunned by his last move and quickly handed over towels.  "Commander Guan, does assembly really require such a delicate operation? Can't you install it roughly first and then make fine adjustments?" A teacher asked doubtfully.  "Haha, it's normal for you to think so" Guan Fei took the towel and wiped the sweat on his face. After relaxing his body, a strong sense of fatigue surged from his heart. He simply sat down on the ground, his arms and legs  Spread your legs apart to make your body more comfortable.  "All the teachers are engaged in mechanical teaching and have considerable research on precision manufacturing. However, in actual workIn the process of manufacturing, the precision of the equipment is not only determined by whether the parts are precise enough, but the final assembly is also a key link in the actual working accuracy of the equipment.  For example, if the screw is slightly crooked, it may not seem like a big problem, but after amplification through conduction, the final movement may produce an error of more than ten microns or even tens of microns.  ??Tightening a screw may seem like an inconspicuous little action, but the pressure exerted by tightening or loosening the screw will have a subtle impact on the fixed parts.  The pressure at this corner is greater and the pressure at that corner is smaller. This cannot be seen initially, but after a long period of operation, the component may tilt toward that corner under the action of pressure, thus causing error changes in the entire operating system.  Overseas, high-level assembly and commissioning engineers are given very high salaries because assembly and commissioning is so important.  The more sophisticated the equipment, the more high-level debuggers are needed. They are an extremely important part of ensuring product quality!  ¡± There is one thing he did not say, that is, the country is doing very poorly in this regard. Doesn¡¯t the country pay attention to final assembly and debugging? Obviously not, but the degree of attention is not enough, and it is far from reaching the level of refinement abroad. The same manufacturer,  The final assembly results of the same piece of equipment may be completely different. One piece of equipment can be as good as the best foreign equipment of the same type, and its operation stability and reliability are not bad at all, but another piece of equipment may be produced every three days.  The problem cannot be solved by repeated adjustments and maintenance. This is because the initial assembly and debugging work was not done well. In the next period of the modification process for the C616, Teacher Tang and the others were impressed by Guan Fei¡¯s precise operation level and almost harsh standard requirements.  A more intuitive understanding. Whoa! Guan Fei squatted next to the lathe guide rail, looked at it back and forth for several minutes, and then peeled off the pasted guide rail film. This is a kind of guide rail film that only Teacher Tang and the others know.  New process. Traditional guide rails are in direct contact with each other, but Guan Fei asked Sun Yaohua to bring back a batch of PTFE soft film from Hong Kong, cut it to a size slightly wider than the guide rail, and stick it on the guide rail as a buffer.  The knowledge taught by Teacher Tang was slightly behind the actual situation. Later, he stayed in the countryside for a long time. He had no idea what the meaning of this kind of soft belt was. He only roughly estimated that this kind of wear-resistant material would ensure that the guide rail could run for a longer period of time.  Deformation. ¡°This soft tape is indeed a wear-resistant material, but that¡¯s not the only reason why it¡¯s used on rails.  Its friction coefficient is also much lower than that of the guide rail, only one-third that of the cast iron guide rail, and the kinetic energy loss is small.  Since the dynamic and static friction coefficient is small, it can effectively reduce crawling during low-speed movements and maintain operational stability.  There is a soft belt buffer, which can reduce the accuracy error caused by vibration, which is equivalent to improving the machining accuracy of the machine tool in disguise, so it is a good thing. Foreign countries have only discovered its benefits in the past few years, and have begun to use it in machine tools,  It is widely used in precision components and aerospace parts.  There is ready-made technology, so why don¡¯t we use it?  " Guan Fei explained to them the function of the guide rail film. "So that's it, but why did you tear off the attached soft tape?  We watched carefully and didn't find anything wrong?  "Teacher Tang and others suddenly realized it. They felt that they had learned some new knowledge and were very excited. However, they still expressed confusion when Guan Fei tore off the attached soft tape. "Haha, because there is a bubble here!  I tried it, but it couldn't be removed, so I had to tear it off and repost it!  "Guan Fei smiled and clicked on the guide rail. Teacher Tang and others were relatively speechless. When the guide rail was reassembled later, they couldn't understand it even more. Guan Fei's requirements for every detail have been met in their opinion.  It was so harsh that in many places they could not notice anything was wrong, but Guan Fei was still adjusting it, and it took an extremely long time. They could only comfort themselves with the interlacing of lines, but this comfort themselves.  They all know something is wrong. They are teachers and have no practical experience. Guan Fei is also a soldier, so shouldn¡¯t he be even more inexperienced? Maybe, people are really different Guan Fei was not surprised by their change from being surprised to being indifferent.  Too much attention, and all his energy was focused on the machine tool. In order to see every subtle change more clearly, he had a circle of incandescent lamps surround the lathe, illuminating every part of the lathe.  He walked slowly on the bed, his eyes fixed on the guide rail, and the visual signals were transmitted to the brain. After being amplified by the biological accessory brain, he made the most precise judgment. He felt that the alignment was not complete, and there should be a slight error.  But no matter how hard you look, you can't find the error, which can be detected by the human eye.What a small object?  The public answer to this question is usually one hundred microns.  But in real life, people can see every hair strand clearly, and the diameter of a hair strand is less than one hundred microns.  There is also silk, whose diameter is usually between twenty and thirty microns, but people can also pick it out with the naked eye, which is very different from the generally accepted answer.  The correct answer is that the minimum observation angle of the human eye is one, then the minimum observation object is tens of microns.  However, when there is sufficient light, as long as one tilts the observation angle slightly and changes the observation position, it is possible to find things that have not been discovered before.  So under extreme circumstances, humans can see things with a diameter of only a dozen microns, especially if it is a relatively long thing, not a point.  This kind of observation is extremely subtle and requires very keen observation and insight, which can only be achieved after a long period of training.  Guan Fei has the help of the biological accessory brain. He does not need special training. He only needs to improve his concentration and make correct judgments in time based on the information fed back by the biological accessory brain.  Since the biological accessory brain indicates that there should be an error here, it must be that there was a frame misalignment of the visual light when we just walked past.  It's just that he didn't notice it at the time and it passed by in a flash. Now that he calmed down and looked carefully, the misalignment was too subtle to be discerned with the naked eye.  He did not feel frustrated, he readjusted the position of the light, then walked to the end of the bed, placed the rail in the center of his sight, and slowly moved his head.  The biological accessory brain controls the body to a cellular level. A normal person cannot accurately judge the displacement data when moving, but with the assistance of the biological accessory brain, he can accurately determine the displacement information to one micron!     Saw!  As his observation position slowly changed, the line formed by the guide rail in front of him suddenly jumped from the original position to another place - there was an error of two squares in the middle!
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