For the machining center testing machine for the first time, the tool magazine is very small and can only hold 12 tools, which is far less than the minimum 18 tool magazine abroad. This is mainly to reduce the difficulty and solve the problem of tool positioning accuracy in the tool magazine in the experiment as soon as possible.

    Sun Lin first chose the scheme of fixed magazine, which is relatively easy in technology. This is also the path taken by most of China''s domestic machine tools. This kind of tool magazine is easy to get started, but now the development of the whole equipment.

    However, this scheme was rejected by Yunfei as soon as it was proposed.

    Fixed magazine is also called hat type magazine in general. The tool magazine is parallel to the spindle, and its tool sleeve number always corresponds to the tool number one by one. Because this tool magazine has no tool preselection function, the tool magazine always stops at that position during tool machining. After the tool on the spindle completes the cutting process, install the tool on the tool sleeve, and then move the new tool called by the machining program to the position of the spindle for tool change.

    For machining centers that use this tool magazine to change tools, the tool change time will generally exceed 8 seconds or even 10 seconds. This is too inefficient for some large quantities of small parts whose production time will not exceed one minute.

    The disk type tool magazine selected by Yunfei is also the most used tool change form in the world. The tool magazine is perpendicular to the spindle. Each time the tool is changed, the tool sleeve rotates downward by 90 degrees under the control of air pressure and parallel to the spindle. The manipulator controlled by air pressure drops to the tool grasping position and rotates by 90 degrees. The manipulator directly grasps the tool handles of the two knives, and then under the control of air pressure, the manipulator grasping the tool drops to the set tool changing point and rotates 180 degrees, Then install the knife into the knife sleeve and the spindle. The air pressure in the spindle and the knife sleeve grasp the knife at the same time, release the manipulator, and then return to the original position, so as to complete the whole tool change process.

    Although this tool changing system controlled by cam mechanism is technically several times more difficult than the hat type fixed magazine, the tool changing time is several times faster than the hat type magazine. The fastest tool change time can reach 0.8 seconds! This is because the tool and the tool sleeve number are randomly corresponding. The system can remember the position of the missing tool and update the data in real time. This involves the signal response between the user macro program and PMC, which is realized by reading and using the system variable to take the exchange condition status bits of various tools in the macro program as the condition for judging the skip execution of the tool change macro program.

    This includes two parts: PMC user program of tool magazine and NC Macro Program (large diameter tool selection and tool change program). Under the control of the machining program, the two parts of the program jointly complete the search for the tool number updated at any time according to the tool change instruction t code to accurately change the tool.

    As the stalls are getting bigger and bigger, the research team of 91 heavy industry alone has more than 200 people. Although among them, except those engineers from the Soviet Union belong to 91 heavy industry, Sun Lin, situ Heyun and their disciples belong to the National Academy of Sciences, and some research institutes and factories belonging to the military have recently joined, However, the salaries and bonuses of these people are the responsibility of Jiuyi heavy industry.

    Of course, as a token of gratitude to the military for providing researchers, Yunfei was offered to pay 100000 yuan to the military every month. There are also many people carrying private goods and using the equipment and funds provided by 91 heavy industry to study some small topics of their own. For these, Yun Fei looked at them and didn''t say anything. Wu Zhongda complained to Yunfei several times and was stopped by Yunfei.

    Perhaps these people from the military do not know that the things they study, as long as they apply for a patent, all belong to 91 heavy industry! This is clearly listed in the secret contract signed by the military. If these goods don''t dry, no problem. Just let the military accompany the loss. Is it really worth 100000 yuan a month to those research institutes under the military?

    Therefore, with the participation of these military researchers, the first processing center of Jiuyi heavy industry can manufacture the test machine so quickly.

    The capacity of the tool magazine of the first test machine is only 12 knives. For the processing of some large and complex parts and the processing of complex molds, and for the product structure processed by general NC machine tools, it is not a very complex common phenomenon. Yun Fei believes that 12 cutting tools are fully sufficient.

    "Check the coordinates of each tool again and prepare for the quick tool change test!" Sun Lin is the project leader of the processing center not designated by Yun, so he asked Lin Yajun if there was any problem with his processing parameter setting after seeing that Lin Yajun had completed the position compensation of all knives in the z-axis direction and looked at Wu Zhongda who was checking the programmed circular tool change program.

    "Lao sun, let''s start directly. There''s no need to always check these. It''s just the parameter settings of processing. What we need to test now is whether the tool magazine can accurately locate again after rotation, rather than start cutting test immediately... "Situ Heyun is very dissatisfied with Sun Lin''s caution.

    "Yes, Mr. Sun, let''s go step by step. Lao Wu, you input the program into the control system and run it to see... "Yun Fei said the same.

    I don''t know what Sun Lin thinks. He has to be very serious to test the positioning accuracy of the magazine.

    "All right. After you input the program, start directly. " Sun Lin smiled bitterly and shook his head. Only then did he find that he was not engaged in scientific research in the Machinery Institute, but in the experimental workshop of a private enterprise.

    Wu Zhongda did not directly input the program into the PLC control panel, but directly handed the paper with the program to Lin Yajun. Lin Yajun just glanced at the program quickly. He didn''t even look at the program. He used both hands and quickly input the program into the control system. In less than two minutes, the program was input.

    "Wait..." when Sun Lin saw that Lin Yajun had finished inputting the program, he exited the program input mode on the operation panel and turned the knob used to select various operation modes on the operation panel to automatic processing. He had to press the start key and hurriedly stopped Lin Yajun.

    "What''s the matter?" Everyone looked at Sun Lin suspiciously. They didn''t know what problem he found.

    "Did you press the start button after running this program once?" Sun Lin asked Wu Zhongda suspiciously. Although he was in charge of the whole project, his main experience was about machinery. He had a deep understanding of ordinary processing and didn''t really understand the programming of NC machine tools.

    The preliminary plan for the tool magazine positioning test is to make the whole testing machine conduct 100 tool change tests on the whole tool magazine at the fastest tool change speed under the control of NC program. This means that the whole tool magazine needs to rotate 100 times and the automatic tool change mechanism needs to run 1200 times continuously.

    There are twelve knives in the whole tool magazine. Each time the tool magazine changes, the adjacent two tool sleeves need to be rotated by 30 degrees. However, in the tool magazine system capable of tool pre selection, after the last tool is replaced, the next tool in the program starts to move to the tool change position for waiting. In this way, the real tool change time is a process of grasping, changing and loosening the tool by the manipulator.

    "..." Wu Zhongda and Lin Yajun heard Sun Lin''s words. They looked at each other, and then stared at Yun Fei, who was stunned. They know that only Yunfei''s explanation can the old man listen to it. After all, Yunfei is the real expert and the boss.

    A group of people around me are experts in machinery, but they are laymen in NC system and NC program. They are also staring at these two technicians with a puzzled face. It is said that NC programming and operating machines can rank among the top technicians in China. This requires the machine tool to automatically execute the program of thousands of actions. Is such a few lines enough?

    Only situ Heyun and his disciples turned their heads aside, with an expression that I didn''t know Sun Lin''s old goods. The question Sun Lin asked was a great shame. Fortunately, the old guy is still qualified to be the boss with himself!

    "Sun Lao, this... There is a program called subroutine or subroutine in the NC machining program. As long as a circular program is compiled in the subroutine, and then how many times it is directly set and executed in the main program..." Yun Fei was worried about Sun Lin''s humiliation, pulled him aside and explained to him in a low voice.

    Hearing cloud Fei, Sun Lin''s old face was red, and he secretly despised himself, and instantly recovered his calm.

    There are specialties in technology! Sun Lin comforted himself in his heart.

    "Bang!"“ PA! "“ 咵! "

    "Bang!"“ PA! "“ 咵! "

    "Bang!"“ PA! "“ 咵! "

    ……

    After Lin Yajun pressed the green start button, the three sounds sounded rhythmically“ Bang! " After the manipulator grasps the tool handle, the air pressure between the spindle hole and the tool sleeve hole in the tool magazine loosens the tool sleeve“ PA! " It''s the sound of the air pressure between the spindle hole and the tool pocket hole of the magazine sucking the tool handle after the manipulator changes the tool, and the sound is "咵!" It is the sound of the magazine turning.

    Everyone present, with a nervous face, silently counted the number of times the voice sounded. As long as twenty-four cycles are sounded in front, it proves that there is no problem with this design. The remaining thing to do is to improve the speed of tool change. Now it takes 3.6 seconds for each tool change, which is a big gap from the tool change time proposed by Yun Fei within 1.8 seconds.

    The rotation angle of the tool magazine is controlled by a hydraulically controlled indexing disc. This is the same principle as the simple fourth axis driven by PMC module made by Sun Lin and others some time ago, but the accuracy of the rotary table is not very ideal, so they made progress at this time.

    "There are still two knives. If there is no accident, we will succeed!" The three sounds have sounded 22 times in a row. Change the knife twice. After one positive and one negative rotation of the magazine, you can tell everyone whether there is a big problem with the rotation and positioning error of the magazine