Chapter 207

"There is a good saying in the movie little soldier Zhang GA: 'don't look at your tumbling now, be careful that you pull the list in the future!' After figuring out all the clouds, my heart is full of energy.

Since then, Yunfei has stayed at the site of the technology department and the production workshop every day. Every day, the old maozi of the technology department changed the drawings and constantly discussed the rationality of various designs with sun Lin. Yunfei has no experience in the design of CNC machine tools, but he has seen many CNC machine tools, including those from Germany, Switzerland, Japan and the United States. Basically, Yunfei has seen CNC machine tools exported to the Chinese market even if he has not used them.

Sun Lin has studied CNC machine tools all his life. Although he has not seen the most advanced CNC machine tools abroad, he has heard of some theories used in advanced CNC machine tools. The only deficiency is that he doesn't know how these theories should become a reality on CNC machine tools.

For example, Sun Lin wanted to use the rack and pinion transmission mode used by foreign Heavy CNC machine tools in the CNC machine tools of 91 heavy industry. As a result, he was severely despised by Yun Fei.

Joking, the use of gear rack is just to ensure the rigidity of machine tool during heavy load processing, and the transmission accuracy is not as high as that of ball screw. Especially the transmission speed, there is no way to compare with the transmission of ball screw pair. Not to mention whether Sun Lin can now make high-precision gear and rack under the existing conditions. If gear and rack transmission is used on small CNC machine tools, it is lucky that the positioning accuracy of the machine tool can be guaranteed to three wires. In addition, the fast moving speed is low. It is estimated that such CNC machine tools have just been developed and will be killed by customers.

"What customers pursue when purchasing CNC machine tools? Machining accuracy is the first pursuit factor of our machine tool manufacturers. Customers pursue not only the machining accuracy of machine tools, but also the machining efficiency of machine tools! We can't reduce the cutting efficiency of our machine tool in order to improve the rigidity of our machine tool! Now many customers, especially the largest customer base of our machine tools, are not state-owned factories, but those gradually increasing private enterprises and private bosses! They buy CNC machine tools mainly to make money. " Yun Fei said this to a group of Chinese and Soviet designers led by Sun Lin and savavsky, who were fiercely discussing whether to reduce the rigidity of the machine tool in order to strengthen the rigidity of the machine tool.

He didn't expect that Sun Lin actually used the gear and rack transmission scheme killed by himself to their 6132 CNC lathe.

"Now we must launch our products as soon as possible, otherwise when the market is divided by other machine tool enterprises, our products, even if they are better than others, will not have much market."

"We must take the market as the guide. What the market needs and what kind of machine tools customers need, we must launch what kind of products. After our first batch of CNC lathes are on the market and recognized by customers, we can develop new products according to market conditions and customer needs. There is only one thing here. No matter what you think, in a lathe with a rotation diameter of 610, you must not use rack and pinion transmission. If you deny the design scheme, I will never let him pass! " Yun Fei doesn't care if Sun Lin is not his employee at the moment.

It's almost a month. The design of the new CNC lathe has not come out yet, and the design of the CNC milling machine is coming to an end. Perhaps it's because of this that they have the heart to relax here and apply the design scheme of rack and pinion transmission to the small CNC lathe.

Sun Lin smiled when he heard Yun Fei's strong tone.

Yun Fei said this, that is, as long as the first batch of 6132 small CNC machine tools designed by Jiuyi heavy industry have a firm foothold in the market, we should start to study heavy-duty lathes with a rotation diameter of more than one meter.

What's wrong with small CNC machine tools?

Heavy CNC machine tools are the most important key equipment in China, a country with an increasing degree of industrialization. No matter what you do, you can't lengthen the guide rail of a small lathe with a rotation diameter of only 300 or 400 mm to 8 meters or even 10 meters long? Even to that extent, it is impossible to produce heavy parts in tons.

After the guide rail is lengthened, the structure can not be stable at all.

In industrial production, the production of heavy parts is the key.

The spindle of some large machine tools, even tens of tons or hundreds of tons, can not be driven by small machine tools at all. Not only because the bed structure design should be determined according to the domestic production situation, the material is also a very key problem.

Now the spindle of the CNC milling machine of Jiuyi heavy industry is stuck by the problem of material.

At present, 42crmnsi can be produced in small quantities in China, but there are too many impurities in it, which is not compared with foreign ones at all.

Although the quality of imported 42crmnsi is guaranteed, the price is extremely high. The price of a ton is tens of thousands! Yun Fei first proposed to take such materials as the production materials of the main shaft, but it was fiercely opposed by sun Lin.

In the Chinese Academy of Sciences, Sun Lin and his colleagues have used this material for many tests, but they have never succeeded.

Because the material problem is not good at home, and because the domestic heat treatment process can not meet the design requirements, the processed spindle is prone to metal fatigue under long-term high-speed rotation

Now Jiuyi heavy industry has become a research workshop.

In the smelting workshop, 42crmnsi has been developed according to the ratio given by Yun Fei. Similarly, the heat treatment section of the smelting workshop is constantly improving the processes of various heat treatment processes and constantly testing various temperatures of heat treatment.

There is no big problem in the machining workshop. After all, there are many experienced old workers and many people in the whole workshop. Their technology is cow driven. Just like when Yun Fei first came to Qingfeng machinery as a master, he performed the slender pole of the car that surprised the whole factory's lathe workers. In the eyes of these teachers who came out of the mountain, it was not a thing at all!

Yun Fei is in the September 1st heavy industry. Now he never dares to show off in the workshop. Otherwise, he will be humiliated by those rebellious workers and his young boss will be unable to stand down. But in theory, Yun Fei is right. He often bluffs the teachers of Grade 8 and 9 who think they are the best in the world. If Yun Fei's theory is tested, these workers can't meet the design accuracy requirements on the drawings or improve production efficiency, These workers will definitely scoff at Yunfei, the boss who runs to the production workshop to give blind guidance.

Every time the workers feel that it can't be realized, Yun Fei can solve many processing problems that give these teachers a headache. Teachers and masters don't know the existence of Du Niang, let alone that there are all kinds of big takers in a certain place in the world. They have nothing to do at work all day. They specially designed some precision super precision parts and let others help solve them.

Otherwise, we will discuss the processing technology of various atypical complex parts. Everyone thinks that the processing technology arranged by themselves is the most reasonable and effective, and can effectively ensure the processing accuracy! In this way, it will be cheaper. Yun Fei is a beginner who only knows some fur.

Yun Fei learned more from Du Niang, especially those professional mechanical websites, than he learned in school. Because many of the things they show off are their secret in reality. If it were not for the east wind to overwhelm the west wind, it would be impossible for some irrelevant Xiaobai to know. Especially the setting of various parameters, which can be obtained only after countless experiments in many factories.

"Xiao Yun, now the spindle sample of the testing machine has been made, but how can we do dynamic balance?" Sun Lin saw the spindle of the CNC milling machine with countless steps and four levels of accuracy in front of him. It was very difficult.

Now the processing has been completed, but Jiuyi heavy industry has no key equipment for dynamic balance at all.

It is estimated that there is no professional equipment for dynamic balance of high-speed rotating spindle in China.

The first CNC milling machine designed by 91 heavy industry now needs dynamic balance of this spindle.

"Use the earth method. Install rotors on both sides to continuously measure the speed of the main shaft to 5000 revolutions. After stopping, remove the excess margin..." for this, Yunfei can only use the earth method.

Even in his time, the dynamic balance equipment that can make relatively large shaft parts in Chengdu will not add up to more than one slap.

If it is those hundreds of kilograms or even tons of heavy-duty rotating spindle, dynamic balance, it is even more necessary to do.

"Lao Zhao, you and goodrian have to do the assembly this time. If the assembly can reach the design accuracy, we 6132 and 6140 can be finalized..." when all the parts are placed in the dust-free assembly workshop, Yun Fei said to Zhao bingbiao, who is about to command the person to start the most basic mechanical assembly.

Although the front prototype did not become the final finalized product of 91 heavy industry, it was not because the assembled machine tool did not reach the design accuracy, but it was designed in many places and was not very reasonable.

Yunfei has seen countless machine tools. Even the most garbage CNC machine tools of that era will definitely be high-grade CNC machine tools now. So he doesn't want the machine tools produced by his company to be the same level as those CNC machine tools on the market.

To do, we must do the best we can.

If the current market situation had not changed, Jiuyi heavy industry would be in danger of breaking the capital chain. Otherwise, Yunfei would never let these CNC machine tools, which are still defective in his eyes, go to the market.