These CNC machining centers in operation, because of the test test, are processing some soft materials that are relatively easy to cut and do not fly chips everywhere. The processing on the machine tool is generally some wooden molds that do not require high processing accuracy.

These are some of the molds used to make sand casting for the carpenters in the smelting workshop, which were originally calculated in millimeter tolerance units, but when they were tested, they were required by the supervisors in the test workshop to do it according to the tolerance within 0.04mm.

Only by making precision products can the actual machining accuracy of the machine tool be detected, and the machine tool can be improved or adjusted according to the data obtained after these processing. Constantly moving towards higher precision.

"How many of them are machining centers in that corner?" For the processing centers in front of them, which are surrounded by fine protective nets, the group of people who take the examination group cannot walk in to watch, and they feel very unpleasant.

However, in the corner of this workshop, there is a space of more than 100 square meters isolated by glass, and there are a few people in white coats who don't know whether they are workers or researchers.

"That's the machining center over there that is doing heavy-duty cutting tests!" Yun Fei didn't plan to take these people into the constant temperature workshop that was separated by glass.

The design of a CNC machine tool must carry out many types of tests, and there are many kinds of cutting tests alone.

The heavy-duty cutting test is mainly used to test the rigidity of the machine tool.

In the nineties of China's CNC machining industry, it is estimated that there are not many companies willing to spend hundreds of thousands or even millions of CNC machining centers for rough machining of blanks, even Xin Kaixing, those machining center processing products, many are in the ordinary milling machine or other equipment to remove most of the allowance that needs to be processed, leaving only a small margin on the machining center for rough machining.

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

A lot of the time. Especially for the machining of some three-dimensional curved surfaces, the margin left by rough machining with ordinary equipment is uneven, and it is very likely that the tool will be damaged during the cutting process. To know that most of the alloy tools used in China's CNC machine tools in this era are imported! A blade is hundreds of dollars, and an alloy knife is hundreds of dollars!

After the assembly plant established by Taiwan's CNC machine tool factory in the mainland has successively provided machining centers to the Chinese market, the number of domestic machining centers has continued to increase, and some relatively large companies, because they cannot recruit enough skilled workers, have to grit their teeth and use some machining centers with poor precision for rough machining of parts. At that time, they would find out. CNC machine tools, in fact, are the same as ordinary machine tools, which have high requirements for rigidity.

Yun Fei is a person who strives for perfection.

He deeply understands that in the future fierce competition in China's CNC machine tool market, in order to be invincible, it is necessary to ensure the quality of these delicate CNC machine tools.

After entering the 21st century, the machining industry, especially the mold processing industry, is a lot of single-piece and small-batch production. This makes it impossible for these products to be subdivided into many steps as is the case with high-volume parts.

When processing complex single and small batch parts, the processing of turning, milling, pliers and even lettering can be realized directly on the machining center, which can be more efficient and cost-saving. If the rigidity of the CNC machine is too poor. It takes about the same amount of time to roughen the parts as a normal machine tool, so what's the use of spending a lot of money on these machining centers? Once the processing time is too long, the processing cost of a single small batch of products can directly increase exponentially.

"Can you let us go in and have a look?" The same guy with two gold stars on his shoulders, very curious about what this workshop has an area separated by glass.

Judging by what they know. CNC machine tools do not need any dust-free workshop or constant temperature workshop.

Yun Fei wanted to refuse their request, but seeing that the old man was also yearning, he could only nod and lead everyone towards the door of the glass house.

When the door is about to be opened. Sun Lin instructed a female worker next to him to go to the warehouse and fetch dozens of pairs of earplugs, handed them to everyone, and then signaled everyone to bring them before opening the glass door.

As soon as the door opened, all kinds of screeching sounds came out, and if you didn't bring earplugs, you might even hear your teeth ache. Fortunately, the top of this workshop is not enclosed, otherwise, the sound inside this room would be louder.

"These machining centers in here can be regarded as completely finished products. However, this is only the finished product we use to conduct the test, and the equipment in it is used to carry out the heavy-load cutting test, and when the test is over, the equipment in it will basically be scrapped......" Sun Lin almost explained to everyone in a roaring voice, as for whether these people can understand what is called heavy-load cutting, he is too lazy to explain.

These things are too basic, and those who don't understand them are useful even if they know the Tao. Those who need to know the Tao can understand it without his explanation.

"What is the heavy load cutting test, you can come forward and take a look to understand." Yun Fei saw that many people were very curious, and those who were not curious were also confused, it was too difficult to explain this matter to people who didn't understand......

Most of the workers in the glass room are operators transferred from the production workers in the machining workshop of Jiuyi Heavy Industry, and the researchers only collect data every once in a while. After all, this test is only to verify some of the design of the machine tool, especially the service life of the machine tool spindle and transmission elements in the process of heavy load machining.

"Deng Lao, this so-called heavy load test is the cutting of these machine tools are designed with the maximum depth of eating, the fastest cutting speed and the highest speed that the machine tool spindle can achieve. Sometimes, half an hour of test may cause the spindle to be scrapped. Yun Fei explained loudly to the old man.

The room is very noisy, especially the machining center in the high-speed operation of the high-speed cutting process of the large amount of cutters, the average person can not stand it at all, the CNC machine spindle on the tool in the high-speed operation, will produce a variety of very rigid sounds. And this sound will vary greatly depending on the depth of the knife and the material, but no matter what kind of sound, it will make people feel uncomfortable.

Visiting this room is very fast, and even with earplugs, the sound can still reach people's ears.

"It's a loser! Tens of millions of devices are actually used like this! As soon as he came out and took off the earbuds, the lieutenant general gritted his teeth and said to Yun Fei.

It's a waste!

The state buys these equipment every year, and spends a lot of foreign exchange reserves, but the young boss of Jiuyi Heavy Industry, a loser, is good, and he can scrap several or even dozens of spindles every day!

How much does a spindle cost?

Fifty thousand!

In this era when the per capita wage is less than 300, hundreds of thousands of dollars in a day have been wasted in Jiuyi Heavy Industry.

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

In the workshop of Jiuyi Heavy Industry, the total time to start work in a month will not exceed 30 hours, and the total value of the scrapped spindle will not exceed 200,000 yuan every month. Moreover, these are all produced by Jiuyi Heavy Industry itself, except for materials, other costs can be ignored at all, otherwise, Jiuyi Heavy Industry's profits of tens of millions of dollars per month are not enough for this laboratory.

Will Yun Fei tell them that the cost of the precision spindle produced by Jiuyi Heavy Industry is only 8,000 yuan?

Will Sun Lin tell them?

Yes.

It's a pity that Sun Lin doesn't care about production, procurement, or finance. The only thing he knows is that the production of such a spindle needs to go through more than 40 processes, and the heat treatment alone has to be carried out six times!

"Xiao Cao, don't scold others for being a loser at every turn, I said at the beginning, come to visit, just honestly close your mouth and visit. See more, listen more, talk less! Xiaoyun, my old man is also very curious, why would it cost such a big cost to conduct such a test that seems to have no other effect except for the loser? Although the lieutenant general was reprimanded, the old man was also very curious about this.

"Deng Lao, this is the case, such an 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, after leaving the factory will have a long service life, and the spindle is the core mechanical component of a CNC machine tool, a machining center, the weight is less than one percent of the entire machine tool, but the price occupies one-eighth of the entire machine tool. If we are always prone to problems, our reputation will become very bad in front of customers. Who will dare to buy our products in the future? Yun Fei explained to the old man why he wanted to conduct such a test.

"At the same time, only after such experiments can we design a spindle that can withstand a long period of operation at a higher speed, so that we can continuously increase the spindle speed of our products and develop a high-speed machine. Foreign processing centers, the speed has been able to reach 18,000 rpm, and ours has just exceeded 8,000! ”

Yun Fei's words made the old man nod with satisfaction.

Those who engage in research should not be too petty. The more you invest, the greater the return, especially in the high-tech industry. (To be continued......)