Chapter 520

"Mr. Yun, are you here?" Upon seeing Yunfei, the busy technicians and designers in the test workshop kept greeting Yunfei.

In this workshop, both researchers who originally belonged to 91 heavy industry and graduates recruited from various universities in recent years are very familiar with Yunfei.

However, those college graduates who have just entered the 91 research institute do not know that Yunfei is popular here. It is not because of his good salary and welfare for these researchers, but because Yunfei, who is originally a technical background and has a strong mechanical talent, has conquered these technical researchers with technology.

If you have doubts, go to the boss.

This is what the old employees of the mechanical test workshop know.

However, now the boss has more and more industries, and he doesn't have much time to come to the Research Institute.

Yun Fei greeted the researchers with a smile and walked towards the inside of the experimental workshop.

With the launch of numerical control research on some of the company's heavy equipment, the technicians working together have entered the mechanical experimental workshop of the 91 Research Institute. The mechanical experimental workshop, which used to be very empty, has become crowded.

In the workshop of thousands of square meters, seven or eight heavy equipment of various models occupy half of the area.

In the experimental workshop, the area occupied by each equipment is not large, but some special supporting tool cabinets around the equipment under study, or fitter tables for placing some parts to be modified or waiting for assembly, occupy an area far exceeding the area occupied by the equipment itself.

Moreover, these equipment are often disassembled and assembled. If there is not enough open area around, it is difficult to display them.

No matter in the Jiuyi heavy industry or the mechanical experiment workshop, there are clear regulations that no spare parts or tools can be placed directly on the ground.

After all, there are some metal parts everywhere in the whole factory. If they are scattered on the ground, someone accidentally slips and falls. If the head is installed on these angular parts, there may be dead people.

The human brain is far less hard than metal, which was demonstrated thousands of years ago.

"Xiao Deng, how's it going?" With Sun Lin, we went to the research area of Longmen milling isolated by color striped cloth. Several technicians in dark blue overalls were inspecting the small Longmen milling machine, which was four meters long, two meters wide and one meter eight high.

"Dr. Deng, how did you do this?" Yun Fei looked surprised and cut a long flowing hair into a student's head. There was a black oil stain on his not beautiful face. A typical mechanical assembler, where does he look like a doctor!

Deng Lanqing ignored Yun's unusual eyes. After nodding at him, he turned his eyes to Sun Lin: "old sun, there is still a big problem with the movement of the column, and the gap between the lower guide rail and the column is still difficult to adjust..." Deng Lanqing didn't expect that the actual action is completely different from the theory.

Originally, she thought that with her mechanical major of ten years, she had to solve some mechanical problems easily, but she worked in 91 heavy industry for nearly half a year to understand that even the assembly of the simplest parts is very learned.

If you want to engage in design, you must have rich practical experience.

Originally, she thought that even if she couldn't be in charge of a project, she had to be a design director. Unexpectedly, Sun Lin arranged her to practice in the front-line of the experimental workshop!

When she was in college, she had experienced countless internships, and when she was in the school laboratory, many designed parts had to be equipped by herself. She thought that even if her assembly experience could not compare with those grade 89 fitters and an ordinary skilled assembler, it was more than enough.

But when she got to the experimental workshop, she was stupid.

Most of the equipment placed in the workshop exceeded her imagination.

There are not many small equipment produced in the production workshop of Jiuyi heavy industry that they visited when they joined the company.

Therefore, she can only learn the most basic things from the beginning with these masters who are said to be mostly level 9 fitters.

"Is the device running? Did you find any big problems during the move? " Sun Lin still likes this doctoral student from Huaqing university very much.

Girls learn less about machinery, not to mention ten years.

"There was a problem during the movement. When the column came to the middle position, it was stuck, and the machine tool gave an alarm..." Deng Lanqing said to sun Lin.

For the research of CNC gantry milling, Sun Lin wants to quickly train the successor Yunfei recruited to him, so most of the work is entrusted to Deng Lanqing. He just starts at the critical time.

"The column is stuck during movement?" Sun Lin frowned.

Logically speaking, such a problem should not occur at all, especially the guide rail length of this gantry mill is only 3.5 meters.

The parallelism of the guide rails under the two columns is only 0.03mm, which far exceeds the design accuracy. After all, most of the equipment used in the test are manually filed by senior fitters.

"Mr. Sun, this estimate is caused by the inconsistent command time obtained by the transmission motors on both sides. Is the gap between the V-groove at the bottom of the column and the guide rail very small?" This is a very common problem.

At least, it is very common in Yunfei's eyes.

"For such a large equipment, the gap must not be too large. Boss, if you don't understand, please don't speak indiscriminately!" Deng Lanqing didn't expect that Yunfei, the boss, was pointing fingers at one side.

Part of the reason why she chose the Technology Development Department of the private company is that she is a little annoyed with the blind command of those who do not understand in state-owned enterprises or national research institutes.

She doesn't think Yunfei can understand much professional mechanical knowledge, although Yunfei is the boss of the company that produces mechanical equipment.

"Oh, cloud boy, are you sure?" Sun Lin heard Yunfei say this and stared at Yunfei with his eyes shining.

"I'm not sure. Let's have a look first. These heavy-duty equipment, unlike our small counting cars and milling machines, the smaller the gap between key parts, the better. The weight of our two columns plus the beam and the spindle unit is more than two tons. If the V-groove between the guide rail and the column does not fit well, just its own gravity may make it difficult for the spindle to move... "Although Sun Lin is a mechanical expert, he is not a window expert.

Hearing Yunfei's words, Deng Lanqing immediately looked at Yunfei with new eyes.

These professional things can't be found out in a random way.

"Sun Lao, Hu Gong, they also suspect this reason, but they are not sure, so they are still observing..." although Deng Lanqing is curious about where Yunfei learned this knowledge, he still agrees with Yunfei's point of view.

This is an indirect compliment to Yun Fei.

Fortunately, she is not a jealous woman.

"It's suspected that this is the reason for improvement. What are you waiting for? Can we observe the problem by observing? " Yun Fei said discontentedly.

These large equipment, unlike small equipment, can produce several test machines at a time. This cost is too high. Moreover, because of the high price, the scope of use is not as wide as that of small general equipment. Therefore, when producing test machines, only one is produced.

If we produce two sets, if the design of a certain place needs to be modified, maybe all of them will be scrapped!

For any product, the final product can only be obtained by constantly modifying the design in the continuous test. It will even be modified hundreds of times!

Theoretical demonstration is equipment, but it is not necessarily correct in practice.

This is why Sun Lin let Deng Lanqing, the top student of Huaqing, start as the most basic assembler! Of course, she's an assembler. She's just a fake. Her job is just to pass wrenches or screws to the assembly masters, and then observe how others assemble, what difficulties will be encountered in the assembly process, and how to solve this difficulty.

"Hu Gong, are you sure what the problem is?" Sun Lin asked Hu Jun, deputy chief engineer of North heavy industry dispatched to Chengdu, who was directing workers to operate the system to keep the column moving forward or backward, while staring at the connection between the column and the guide rail.

"I'm not sure now, but there is a 70% possibility that the models between the two columns are not synchronized. Of course, there are some aspects of machinery that need to be improved. Mr. Yun, why are you here when you have time? " Hu Jun, who stared at the movement of the guide rail, answered Sun Lin without lifting his head.

The age difference between them is not big. In addition, when Sun Lin was still in the Machinery Institute, he often discussed problems together, so he is very familiar with them.

However, he did not expect that Yunfei would appear in the experimental workshop.

"No doubt, that's the problem. Look at the guide rail, here, here, and here. These traces are caused by the column rubbing too hard with the guide rail when the card is stuck..." Yun Fei went to the column, squatted down, regardless of the oil stain on the guide rail, touched it and found several traces that can't be seen by the naked eye.

Normally speaking, the deputy chief engineer from North heavy industry can't be unaware of such a simple problem.

However, it is not easy for Yunfei to raise questions in his heart. He can only point out the traces and let them see for themselves.

"Sure enough, it seems that the surface roughness on the guide rail is not enough, and the hardness of the guide rail has to be improved..." he touched the place where Yun didn't point out with his hand, and felt a little resistance with his fingernail. Hu Jun immediately found the problem.

Yun Fei really doesn't know whether it is necessary to improve the surface roughness and increase the hardness of the guide rail.

These problems, he is not professional, even, he rarely knows.

In the past, the heat treatment he contacted was to treat the hardness of some mechanical parts to the range of hrc5-6, while in the machine tool industry, the hardness of some key parts or key parts is basically only hrc1.

Don't interrupt anything you don't understand.

This self-knowledge is clear. There are still some clouds.

"These mechanical problems are easy to solve, but the problem of signal transmission delay of the control system is not easy to solve. Situ, do you have any ideas?" Situ Heyun was originally taking a group of college graduates who had recently entered the Jiuyi group to solve some problems of instability in the control system of heavy numerical control vehicles in the nearby heavy numerical control vehicle area. Seeing that Yun had not directly entered the Longmen milling area, he came with a group of disciples.

"It's really hard to solve this problem. It's estimated that tanalia from the other side of the system should come together to discuss and solve it. After all, if two columns are driven by one motor, it's too difficult..." situ Heyun wants to move the x-axis worktable left and right, but the weight of such a huge worktable exceeds five tons, plus the weight of some heavy parts, It is difficult to drive parts weighing more than ten tons, even with the rack and pinion transmission pair specially developed by xinkaixing for Heavy CNC equipment.

Over time, the gear rack under the workbench is easy to wear, which is not good for the accuracy of the equipment.

"Why not install a motor in the middle outside the workbench, and then use a spindle to drive the guide rails on both sides of the workbench to move at the same time?" The thinking of these old guys is limited.

Always design and research according to the traditional or foreign given framework. How can we produce good equipment suitable for our own use without other people's technology and experience?

China's CNC machine tools are already far behind foreign countries. If we follow foreign experience, we have to take many wronged roads. When can we catch up with foreign countries?

"Xiao Yun, we have also considered this. Our DC servo motor power is not enough, and foreign large DC servo motors will not export to us..." situ Heyun said shyly.

The DC servo motor he designed can't drive the spindle unit weighing several tons to move stably or stop urgently for a long time.

"Add a set of floating hydraulic device under the column to help reduce the weight of the spindle unit!" Yun Fei said without thinking.

"Ah! I didn't think of it! Ordinary heavy equipment will use hydraulic devices to reduce the gravity of moving parts. Why do we have to redesign a new scheme when numerical control? " As soon as Yun Fei's words were finished, situ Heyun slapped on the forehead.

"This scheme really has great feasibility. Xiao Deng, write down what President Yun said. You can find Andre later. Let's have a meeting to discuss it. If it proves that this scheme is feasible, start modifying the design today. Such a scheme should be completed in a few days." Sun Lin told Deng Lanqing in a daze.