Chapter 183

"What have you got?" Yun Fei got a call and was a little confused. Thinking stagnated for two seconds, his face was flooded with ecstasy. He ignored what the people on the phone said, hung up the phone and rushed out of his general manager's office.

The phone call just now was made by the old guy sun Lin. situ Heyun was also excited to grab the phone. Unexpectedly, as soon as he grabbed the phone, he heard the busy tone of "Dudu" from the other end of the phone. He reluctantly put down the phone and stared at Sun Lin with dissatisfaction.

"The credit belongs to all of us. Why should you tell cloud boy good news?" Situ Heyun always felt like a child robbed of candy. Sun Lin is the person in charge of this project. He is also the same. What do you spell? He ranks first to report the good news to Yun boy? In the end, I didn't even say a word to cloud boy.

Isn't this subconscious telling Yun Fei that he is the greatest hero!

My sister-in-law can stand it, and my uncle can't stand it.

"Cloud boy doesn't want to talk to you, and I don't have any way..." Sun Lin is now proud. Yesterday, all parts of the whole system have been processed. Several old assembly workers with rich technology and experience transferred from the assembly workshop of 91 heavy industry finally completed all the assembly this morning after one night's efforts.

Just after the assembly, situ Heyun commanded his disciples and grandchildren to connect the rotary worktable driven by the hydraulic workstation with the CNC system. After connecting with the hydraulic workstation, situ Heyun, an old man, couldn't wait to input the operation of several hydraulic worktables defined as axis B into the system.

After checking all the lines, the staff nodded to the two old goods standing in front of the control system operation panel. Situ Heyun stretched out his index finger and pressed the green button on the operation panel.

Sun Lin didn't get the honor of being the first to press the start button. After seeing that situ Laohuo pressed the start button, the huge hydraulic workbench began to rotate slowly. He hurried to the office next to him. He wanted to report the good news to Yunfei as soon as possible. Whoever is the first to report good news to Yun Fei shows that he has made the greatest contribution. Because only the most meritorious people are qualified to report good news to irresponsible project proponents, owners, and users.

For a long time, they both said that their team contributed the most, and they didn't compete for merit. Anyway, they simply wanted to overwhelm each other. In this simple fourth axis of the NC machining center controlled by the NC system and driven by the hydraulic workstation, whether the machinery is more important or the logic control of the circuit is more important, the two have argued many times since the implementation of this project.

For no other reason, they all want their men to get more people and more research funds.

Although they are from the country, they are now working for Yun Fei. If they can get more research funds from Yun Fei, a local tyrant in the world, to study the projects they have always wanted to do, they are short of projects that have not been implemented because they have no funds in this field.

Yun Fei is a local tyrant, but up to now, the local tyrant not only has no money, but also owes tens of millions to the bank. In the situation of more wolves and less meat, only strong wolves can eat.

If they are evenly distributed, maybe wolves who are not full will become more hungry and not beautiful in the end.

"Is this the fourth axis you made?" Yun Fei was dumbfounded when he saw the flat bench with a huge chuck more than one meter high and one meter wide.

"Yes, is there anything wrong?" The two old goods were dumbfounded when they heard Yunfei's words.

"Can you tell me how much z-axis travel is required for such a worktable to process some parts with a rotation diameter of only dozens or more than 100? How to process the end near the chuck to avoid the tragedy of the collision between the spindle and the workbench? " For such a simple question, Yun Fei doesn't believe that the two old goods are not clear.

Because machining centers use more small machine tools with a stroke of less than one or two meters, generally speaking, the stroke in the z-axis direction will not exceed one meter. For a Z-axis travel of more than one meter, even if the moving distance is increased by 10%, it will be more than 50% technically. Especially for high-end machine tools, the travel is more than 1mm, which is very difficult.

Most large machining centers are gantry type. The worktable does not move, but moves up and down from front to back, left and right by two columns and the main shaft above the beam. The longer the spindle extends, the worse the overall rigidity of the machine tool in the machining process. The machine tool with poor rigidity will not only reduce the cutting efficiency of the machine tool, but also make the machine tool unable to ensure the machining quality and machining accuracy in the cutting process.

The spindle has no rigidity. In cutting, there will be a phenomenon of making or planting a knife under the reaction of cutting force. In less serious cases, the part is just that the size of the program design can not be machined in place, or a small amount of over cutting. But in serious cases, the whole part will even be scrapped.

You know, many times, the price of products processed on the processing center will far exceed the value of the processing center itself. If such a situation always occurs, who dares to use such a machine tool?

Therefore, in the whole world, the more large and heavy machine tools, the more expensive they are. That kind of super large cutting machine tool will even be larger than the standard workshop of many factories, so we have to build a special workshop. Don't mention the price. The price of the largest machine tool that Yunfei knows in his own world is hundreds of millions. It is still US dollars when it is exchanged with RMB for us $8.6!

When the two old goods heard about Yunfei's culture, their faces were filled with pride and joy, and their opponents disappeared. They have been dealing with all kinds of mechanical equipment for decades. How can they not know the problem.

From the very beginning, Yun Fei gave them some vague theories and left them to explore by themselves, design and improve at the same time. Originally, it is not a very difficult problem. In China, it is just because of habitual thinking that we have not thought about it. At present, even two axis CNC lathes in China are short of the door because of the problem of ball screw. Three axis machining centers involve more things. At this time, they can't directly cross the most basic two axes and three axes and focus on the four axes involving more knowledge.

When the number of domestic machining centers is maintained to a certain extent, the expensive four-axis machining center can not be as expensive as the three-axis machining center because of its low price (compared with the multi million dollar price of four-axis machining center, especially the five-axis machining center), which is common in China, and the domestic eyes will focus on the simple four-axis. In Yunfei's world, 80% of China's four axis machining centers appear in this way.

"Well, Xiao Yun, I think you know, we don't have much foundation. It's good to be able to do so. Many of our heavy military equipment now need large-scale four-axis machining centers, and the small rotary worktable can't meet the use... "Knowing that the thing we spent several months to make in front of us has no mass production value, Sun Lin's heart is very uncomfortable.

Situ Heyun and their disciples nodded their heads and echoed Sun Lin's words.

High end machine tools originally serve the national defense industry. If the high-end machine tools produced can not be applied to the military industry, why should they be embarrassed?

On the surface, the external fourth axis controlled by the NC system is very simple, but there are too many things involved. Although it is only a simple rotary table jointly driven by a hydraulic workstation and numerical control device, according to their design, if it is too small, due to the backwardness of domestic materials and heat treatment process, it is simply impossible for those parts with a diameter of only two or three millimeters to bear the torque generated when machining some relatively long complex parts.

For example, machining a transmission shaft composed of quadratic or cubic functions of two regression parabolas for high-speed rotation is not only difficult for materials, but also because the transmission shaft required for reciprocating stroke motion of many high-precision large equipment is relatively long, The torque generated by such a shaft in the machining process is too for rotary work, and the regression curve changes repeatedly in a large range. If the rotary table cannot bear the torque under high-speed rotating processing, it is likely to break the rotating parts in the rotary table.

"Do you expect to use this for large parts processing? Is there any mistake? " Yun Fei was depressed about their ideas.

If they do this, they will not come up with a simple fourth axis rotary table for hanging, but a turning and milling composite machining center. Although he also wants to get the turn milling compound machining center out, it is even more difficult than the five axis. Even in his world, when he left, Germany, which has the most powerful CNC machine tool technology, did not succeed completely.

"Mr. Sun, I know what you want to get out is the fourth axis used on large machine tools, but have you ever thought that there are no large-scale machining centers in our country, except for a small number of old three-axis machining centers imported abroad with X-axis travel no more than two meters and y-axis travel no more than one meter and four meters. What can you do now even if you make such a big one? " Yun Fei said solemnly to these people who are at least a round older than before.

"Although such a huge rotary table is of no value at all, it's not useless..." Yun Fei knows that he can't eliminate the enthusiasm of these free labor forces.

Hearing Yunfei's words, all the people stared at Yunfei warmly.