These running CNC machining centers process soft materials that are easy to cut and will not fly everywhere because of the test. The wood molds processed on the machine tool generally do not require high machining accuracy.


    These molds are made for sand casting with the help of carpenters in the smelting workshop. They were originally counted in mm, but during the test, they were required by the supervisors of the test workshop to do them within 0.04mm.


    Only by making precise products can we detect the actual machining accuracy of the machine tool, and improve or adjust the machine tool according to the data obtained after machining. Continue to develop towards higher accuracy.


    "How many machines in that corner are also processing centers?" For these processing centers surrounded by fine protective nets in front of us, the participants in the examination group couldn''t go in and watch, so they felt very unhappy.


    However, in the corner of the workshop, there is a space of more than 100 square meters, which is isolated by glass. There are several people in white coats who do not know whether they are workers or researchers. Inside, they check some machine tools that are very similar to the CNC machining centers imported from abroad and the CNC milling machines equipped with shields in the 91 heavy industry assembly workshop.


    "That''s the machining center for heavy load cutting test!" Yunfei didn''t intend to take these people into the constant temperature workshop separated by glass.


    The design of a numerical control machine tool must carry out many types of tests. There are many kinds of cutting tests alone.


    Heavy load cutting test is mainly used to test the rigidity of machine tools.


    In China''s CNC machining industry in the 1990s, it is estimated that not many companies are willing to use CNC machining centers that cost hundreds of thousands or even millions to carry out rough machining of blanks. Even Xin Kaixing, many of the products processed by those machining centers are removed from ordinary milling machines or other equipment, Only a small margin is left for rough machining on the machining center.


    All this is because it is too difficult for China to get CNC machine tools!


    In many cases, especially in the machining of some three-dimensional surfaces, the allowance left by rough machining with ordinary equipment is uneven, which is likely to damage the tool in the cutting process. You know, most of the alloy cutting tools used in China''s CNC machine tools in this era are imported! A blade is hundreds of dollars, and an alloy tool is hundreds of dollars!


    After the assembly plants established by Taiwan CNC machine tool factory in the mainland successively provided machining centers to the Chinese market, the number of domestic machining centers continued to increase. Some larger companies had to bite their teeth and use some machining centers with poor accuracy for rough machining of parts because they could not recruit enough skilled workers. Until then, they will find that CNC machine tools, like ordinary machine tools, have high requirements for rigidity.


    Yunfei is a person who pursues perfection.


    He deeply understood that in the highly competitive Chinese CNC machine tool market in the future, in order to remain invincible, we must ensure the quality of these delicate CNC machine tools.


    After entering the 21st world, many of the machining industry, especially the mold processing industry, are single piece and small batch production, which makes it impossible for these products to subdivide the process into many steps like the processing of large quantities of parts.


    When processing complex single piece and small batch parts, turning, milling, pliers and even lettering can be realized directly on the machining center, so as to be more efficient and save costs. If the rigidity of CNC machine tools is too poor, and the roughening of product parts takes about the same time as that of ordinary machine tools, what''s the use of buying these machining centers at a high price? Once the processing time is too long, the processing cost of products produced in small batches in a single room may directly double.


    "Can we go in and have a look?" The same guy with two Venus on his shoulder wondered why there was an area separated by glass in the workshop.


    In their understanding, CNC machine tools do not need any dust-free workshop or constant temperature workshop.


    Yunfei wanted to refuse their request, but seeing that the old man was also yearning, he could only nod and take the people to the door of the glass house.


    When he was about to open the door, Sun Lin told a female worker next to him to go to the warehouse, get dozens of earplugs and give them to the people. He motioned them to take them, and then opened the glass door.


    As soon as the door is opened, all kinds of harsh sounds closed inside come out. If you don''t wear earplugs, you may even hear that your teeth will be sour. Fortunately, the top of the workshop was not closed, otherwise the sound in the room would be louder.


    "These processing centers here can be regarded as complete finished products. However, this is only the finished product we use to carry out the test. These equipment are used to carry out the heavy load cutting test. When the test is over, these equipment will basically be scrapped... "Sun Lin almost explained to the people in a roaring voice. As for whether these people can understand what heavy load cutting is, he was too lazy to explain.


    These things are too basic for people who don''t understand, even if they know, they are not useful. Those who need to know can understand without his explanation.


    "What is meant by heavy load cutting test? You can come forward and have a look." Yunfei sees many people who are very curious, and those who are not curious are also confused. It''s too difficult to explain this to those who don''t understand


    Most of the operating workers in the glass room are transferred from the production workers in the machining workshop of Jiuyi heavy industry. The researchers only collect data at intervals. After all, this test is only to verify some designs of the machine tool, especially the service life of the machine tool spindle and transmission components in the process of heavy load machining.


    "Deng Lao, the so-called heavy load test is that the cutting of these machine tools adopts the maximum depth of penetration, the fastest cutting speed and the maximum speed of the machine spindle that can be achieved when our machine tool is designed. Sometimes, the spindle may be scrapped after half an hour of the test. " Yun Fei explained loudly to the old man.


    The room is very noisy, especially the noise generated by the machining center during high-speed cutting with large tool consumption during high-speed operation. Ordinary people can''t stand it at all. When the tool on the spindle of NC machine tool runs at high speed, it will produce all kinds of very rigid sounds. Moreover, the sound will vary greatly according to the depth of the knife and the materials, but no matter what kind of sound, it will make people feel uncomfortable.


    It''s very fast to visit this room. Even with earplugs, the sound can still reach people''s ears.


    "What a black sheep! Tens of millions of equipment are used in this way! " As soon as he came out and took off the earplugs, the lieutenant general said to Yun Fei with gnashing teeth.


    This is a waste!


    The state spends a lot of foreign exchange reserves on purchasing these equipment every year, but the loser young boss of 91 heavy industry can scrap several or even more than ten spindles every day!


    How much is a spindle?


    Fifty thousand!


    In an age when the per capita wage was less than 300, hundreds of thousands of people were wasted in one day by the ninth heavy industry.


    But where did he know that if he did this every day, even the richest man in the world could not afford to hurt.


    In the workshop of 91 heavy industry, the total time of starting work in a month will not exceed 30 hours, and the total value of scrapped spindles per month will not exceed 200000. Besides, these are all produced by Jiuyi heavy. In addition to materials, other costs can be ignored. Otherwise, the monthly profits of Jiuyi heavy industry are not enough to plug the teeth in this laboratory.


    Will Yunfei tell them that the cost of precision spindles produced by 91 heavy industry is only 8000 yuan?


    Will Sun Lin tell them?


    meeting.


    Unfortunately, Sun Lin doesn''t care about production, procurement or finance. The only thing he knows is that producing such a spindle requires more than 40 processes. Heat treatment alone has to be carried out six times!


    "Xiao Cao, don''t scold other people''s black sheep. I said at the beginning that if you come to visit, you can just shut your mouth and visit. See more, listen more and speak less! Xiao Yun, my old man is also very curious. Why does it cost so much to carry out such an experiment that seems to have no other effect except being a loser? " Although he reprimanded the lieutenant general, the old man was also curious about this.


    "Mr. Deng, this is the case. This experiment is not only to test the performance of the machine tool, but also to verify our design, processing technology and even materials. These CNC machine tools will have a long service life after leaving the factory. The spindle is the core mechanical component of a CNC machine tool. A machining center weighs less than 1% of the whole machine tool, but the price accounts for 1 / 8 of the whole machine tool. If we are always prone to problems, our reputation will become very poor in front of customers. Who dares to buy our products in the future? " Yun Fei explained to the old man why he wanted to carry out such an experiment.


    "At the same time, only through such experiments can the spindle designed by us withstand the operation of higher speed for a long time, so that we can continuously improve the spindle speed of our products, so as to develop a high-speed machine. The speed of foreign processing centers has reached 18000 revolutions, while ours has just exceeded 8000! "


    Yunfei''s words made the old man nod with satisfaction.


    Those engaged in research should not be too stingy. The more investment, the greater the return, especially in high-tech industries.