Smart Industrial Empire

Ordinary lathe guide rails have a precision grade of five and a surface roughness of 0.8.Compared with precision machine tools, flatness and straightness are relatively large.

Taking ordinary machine tools as an example, the general accuracy range is: for ordinary lathes with a processing length of one meter and a rotary diameter of 0.8 mm, the roughness on the surface of the guide rail must be above 0.015, the straightness must not exceed 0.012 mm, and the flatness must not exceed [-] mm. More than [-]mm.

Machine tools with longer guideways have larger these tolerances.

Of course, for the same type of machine tool, the smaller these values ​​are, the higher the precision level is, and the more difficult it is to achieve the same precision.

On the earth, the country that produces ordinary machine tools with the highest level of precision is not Germany with the best technology, nor the United States with the strongest strength, but Switzerland, a small European country!Of course, the ordinary machine tool with the highest production precision mentioned here does not refer to the highest technical level that the entire country can achieve, but the overall manufacturing level.

Whether the specific facts are like this, Yunfei doesn't know, anyway, the actual situation he once realized is like this.

Switzerland is just a small country in Europe, and its domestic industrial base is not perfect.However, the ordinary machine tools they produce in China are almost in short supply in China, where the production capacity far exceeds his.The price of an ordinary lathe made in Switzerland is three times that of a lathe with the highest level of precision made in China!

Not to mention CNC machine tools.

Excluding those most sophisticated high-end CNC machine tools that European and American countries are unwilling to sell to China, but Japan does not dare to sell them to China, in China's high-end CNC machine tool market, the first choice of domestic users is also Swiss-made CNC machine tools.Switzerland's CNC machine tools even surpass Germany in terms of machining accuracy and stability!However, he does not have the production capacity of Germany, so there is no way to compare with Germany in terms of quantity.

Yunfei once saw a precision ordinary lathe imported from Switzerland in the 80s. After using it for nearly 20 years, it could even process parts with an accuracy of two or three μ!

Domestic ordinary lathes.Small ordinary lathes, conventional lathes with a turning diameter of 250mm, 320mm and 360mm, have a maximum speed of only 3000 revolutions, but Swiss-made lathes can reach more than [-] revolutions!

Anyone who does dry machining knows that the smaller the diameter of the part to be processed, the higher the line speed required.Because the smaller the diameter of the rotator, the smaller the linear velocity when it rotates.Even if it reaches [-] revolutions, the linear velocity of the rotation center of the workpiece is still zero.But the farther your center point is, the same diameter.The higher the speed, the higher the line speed.

Although the highest speed that can be achieved on a domestic ordinary lathe is [-] rpm or [-] rpm, it cannot be used at all in use.Because that speed is only the design speed of the machine tool, if such a speed is really used and the parts are processed for a long time, all the gears in the headstock will be scrapped in a short time.But the Swiss made will not have this problem.

The reason why Yunfei wants to establish a standard that is one or half a grade higher than the domestic counterparts on the machine tools he produces is because the Swiss cutting machine tools have given him a deep impression.

The smoother the machine tool rails are.The cutting process during processing will be more stable, so that the quality of the products produced will naturally be higher.

How can the accuracy level of a machine tool be reflected?It depends on the quality and precision of the parts processed by this machine tool!machine user.But there is no professional testing equipment like machine tool manufacturers.Therefore, it is very simple for them to test the accuracy of the machine tool, that is, to directly install a part on the machine tool for one processing.

"Director Yun. You should stop staring here. Why don't you go back to your office to drink tea or read the newspaper. How about I call you when you're done?" Yang Bingbiao tried it with the special file in his hand. After a few times, I couldn’t find the hand feeling at all, and it was the same when I turned my head and saw Guderian. He was not in the same state when he first arrived in China and repaired the guide rails of those large equipment with himself in the mountains.

"It's okay, you guys do your work, I'll just watch from the side, it won't affect you." Yun Fei has always been curious about how the ninth-level fitter grinds out the guide rail by hand, especially the inspection method of the ninth-level fitter.

It turned out that Yang Bingbiao and the others were repairing and maintaining these equipment in the cave in the mountain. When the machine tool was overhauled, he didn't have time to look at it at all.In the original world, the overhaul of machine tools and the grinding of guide rails were all done with guide rail grinders.He can't see it at all.

The equipment in their factory, if the accuracy of the machine tool drops sharply, will not be overhauled at all, but will be sold as scrap iron to second-hand equipment, and new equipment will be bought instead.State-owned enterprises lack everything, except money. Many of the country's annual financial allocations are spent without any legitimate reason.Adding equipment is definitely a reason that cannot be more legitimate.

Yunfei has always wanted to see nine-level fitters grinding guide rails in this era. He knows that in a few more years, there will be almost no scenes of manually grinding guide rails in China.The reason is that China's most elite mechanical workers have retired, and the newly grown skilled workers have no chance to get in touch with the ultimate career of fitters. In addition, manual grinding of guide rails is too inefficient.If one person comes to grind the guide rail, it will take at least ten days and half a month for one guide rail!

"You are here, we don't know how to work..." Yang Bingbiao told the truth regardless of the boss in front of him.

When Yang Bingbiao said this, Guderian also nodded.

When Yunfei, the boss, started to guard the previous process, he roared for a long time in each machining process, but everyone in the factory heard it.

When grinding the guide rail, the energy can be highly concentrated, otherwise, if one is not careful, the guide rail repaired with a file will be uneven.In the world of martial arts, masters pay attention to the unity of one's sword and one's body. A nine-level fitter grinds the guide rails, just like those super masters in the world of martial arts. Reach your highest level and overwhelm your enemies.

The existence of Yunfei made Yang Bingbiao and Guderian unable to keep their ears quiet, because Yunfei kept asking various questions.

"Uh..." Yun Fei was speechless to Yang Bingbiao's words.

He understood the meaning of Yang Bingbiao's words.

Here he asked questions such as whether it is possible to grind the guide rails with second-level precision, how to make more people reach their level, and gave the whole factory the highest level that can be achieved by skilled workers representing China and the Soviet Union. Level master pressure.

It is too difficult to achieve an accuracy level of more than four levels.

The reason why Yunfei is like this is that he wants to learn from Switzerland.Because the guide rails of precision machine tools in Switzerland are all repaired by workers with files and whetstones bit by bit!The machine tool produced in that way has very little residual internal stress in the machine bed structure, and will not affect the most important track of a reasonably designed machine bed at all.Some people are even bored and use mathematical models to analyze machine tools produced in Switzerland. If they are not oxidized by oxygen in the air, the guide rails of machine tools will not deform more than 100mm even after 0.02 years.

"Brother Yunfei, what's wrong with you?" Ni Lishuang is now a clerk in Yunfei's office, and Yunfei's assistant is still the fourth girl of the Mao family.

Ni Lishuang's main position is in finance, but she just graduated from a technical school, and she has no practical experience in finance at all, so she works as a clerk in Yunfei's office while studying with the finance department.

She is Yun Fei's housekeeper, and she must help Yun Fei manage his money so that her and Yun Fei's children will not go hungry in the future!

"What can he have? I want to go to the production workshop to see Master Yang and they grind the guide rails..." Mao Yadong told her sisters who grew up together the reason why Yun Fei was restless.

"What's so good about grinding guide rails? It's just a few old masters scratching with a file..." Ni Lishuang was really puzzled by this.

Although she doesn't understand mechanical processing, but watching her brothers Yunfei and the others learn those things since she was a child, she doesn't think that a job that doesn't even use equipment can have much technical content.

And the classification will not tell them, maybe it won't be long before they will never see such a scene again.

I have experienced two lifetimes, but I can't see that only people and some simple tools can achieve a processing level that far exceeds that of the most sophisticated advanced machine tools.

Yun Fei fidgeted for three days, and felt unable to wait any longer after less than half an hour at work on the fourth day. He wanted to go to the scene to have a look, but he was worried that it would affect the work of the two of them. The two women in the office went to the ball screw factory guarded by Wang Qingfeng to see the machining center that had just arrived, and they were told that the guide rails had been ground.

Although he didn't see how the nine-level fitter inspected and processed it, Yunfei was very happy to see the results of the processing process.

"You stayed up all night last night?" Yun Fei walked to the scene, only to find that not only Yang Bingbiao and Guderian, but also several other nine-level fitters in the entire factory were here, and all of them had red eyes , with a tired look on his face.

"I know you are eager to see the finished product. After finishing the scraping, I left the other brothers at six o'clock yesterday afternoon, and began to grind the surface of the machine tool with oil stone and sandpaper in rotation. Now Finally, it barely reached the third-level accuracy..." Yang Bingbiao answered Yun Fei's words with a tired face.

"I'll go..." Yun Fei let out a long breath secretly! (to be continued..)