Monster Factory

Appeared in Ye Qing's eyes, it is a silver-white standard hex nut.

Gently pinch the nut, the first reaction of Ye Qing is that the nut is very heavy.

The standard nut of the same size is about seven grams. Ye Qing often deals with these things and is very accurate in its weight. But this nut starts with a weight of about fifteen grams.

The increase in weight indicates that the nut is made of a denser high-hard alloy.

When Ye Qing pinched the alloy nut on the hand, look at the inner wall thread with the crystal lamp on the head.

Ye Qing, who has been polished by the monsters tough nerves, couldn’t help but be surprised.

There is no thread inside the nut.

Some of the crystal-clear nuts have a light metallic reflection under the light.

Reflective, it means there is a metal mirror. However, the inner wall of a nut is as smooth as a seamless precision tube.

A nut without a thread, can this be called a nut? Perhaps a metal washer is more suitable.

What is a nut?

Nuts are the most common metal parts in modern industry and life. Nuts and screws, the two are tightly combined to play the principle of fixing objects, even the first grade children know.

Inside the nut is called the internal thread, and the screw or bolt is called the outer thread. Only two nuts and screws of the same size can be connected together.

The diameter is the same and the spacing between the threads is the same.

If there is no thread, how can it be screwed tightly?

This kind of mistake that violates common sense of physics, Ye Qing believes that it is impossible for Japanese science and technology to commit crimes. Since they proudly gave this nut as a gift, the nut must have its own strength.

"Is there a magnifying glass?"

Professor Cai Chenning nodded slightly and handed a Kalander 300 times portable microscope.

A portable microscope with a light source is usually used to observe the surface of the jewelry and the surface roughness of the metal material. It is only the size of a mobile phone and is ideal for carrying.

Adjusting the resolution and the light source, Ye Qing aligns the lens of the portable microscope with the inner hole of the nut.

Ye Qing’s face has also become serious. At 300 times magnification, the inner hole of the nut that originally looked like a mirror is as smooth. There is actually a thread inside the test thread. These threads are surrounded by a circle, and the spacing between the teeth and the teeth is unbelievable.

Under the observation of three hundred portable microscopes, it is possible to barely see the traces of depression between the teeth.

How thin are these teeth?

The thickness of a hair strand is 0.06 mm on average, but a hair strand can be easily seen with the naked eye. If a hair strand is neatly arranged, leaving a gap of the same thickness in the middle, can the human eye not see it?

Closer to a closer look, you can find clues. Ye Qing took a picture of her own hair, placed it under a portable microscope, and recorded the focal length and approximate width in the heart, and then aligned it to the inner wall of the alloy nut.

Compared with the hair silk, the thread pitch is so small that it cannot be judged. This shows that the gap between the teeth is much smaller than one tenth of the hair. As for the specific size, it has exceeded the visual analysis ability of the human eye.

"We measured it with a laser interferometer. The thread pitch is 0.2 wire and the thread depth is 3 wires." Professor Cai Chenning gave the answer.

"No wonder."

Ye Qing understands that the human eye can distinguish things that are much thinner than the hair. Even with sufficient light source and different color contrast, even the silk can be seen. But such a small thing has reached the limit of the naked eye.

A single silk is fine. If the two silks are close together and there is a gap of the same thickness in the middle, the human eye will default to one.

These threads are also the same principle. It is too thin, only as thick as one-thirtieth of the hair.

A circle of ultra-fine thread wraps, of course, has exceeded the visual recognition limit of the human eye, creating the illusion that the surface of the nut does not have any threads.

1 Hami, in industrial processing, often become 1 wire, 1 wire is equal to 0.01 mm.

And now the accuracy of the international five-axis machining center, the accuracy is usually 0.2 wire. The domestic precision is 0.8 filaments.

This is only theoretical data. In actual operation, if you want to reach the accuracy of 0.2 wire, you must adjust the machine to the best level, and use the laser to correct the tool and the tool wear automatically.

This nut in Ye Qing’s hand has already represented the processing limit of the ordinary five-axis machining center.

"Open your eyes, who can imagine the Japanese Polytechnic University, can you make a nut like this?" Professor Cai Chenning said with some sorrow: "When we got this nut, we still have students who don't know how to do it, laughing at the Japanese University of Technology. The washers are unclear, and a non-threaded washer is sent, which is a nut."

“There are people who ask me if the commercial five-axis center can control the precision to 0.2 wire. In theory, the precision control can be higher in the laboratory. Why can't I create a screw?”

Because of this screw, it must be done in one go, and hundreds of threads that are invisible to the naked eye are machined out.

The key is that you still have to be able to tap the knives, not to mention the market can not buy, I will make stupid words. It's much harder to make a tool that can tap the screw, which is much harder than making one.

Also, the thread of this screw or nut is too thin. If the factory machine tool cuts a knife from the alloy steel, it cuts the thickness of one wire.

The cut piece will never be a vertical piece of metal, but a roll of the same lollipop.

This is the metal stress, thermal deformation, cutting angle of the tool, metal toughness, and so on.

Professor Cai Chenning wondered how the Japanese Polytechnic University did it. In a five-mm-height nut, it processed hundreds of ultra-precision threads with a 0.2-pitch pitch.

The thread that the most important people have machined is not deformed.

“The answer is the metal material used for this nut.” Ye Qing gaze at the nut that represents the most advanced processing technology. He whispered: “Japan has a good job in special alloys, ordinary metals are not resistant to high temperatures, they use Alloy materials should be able to avoid metal stress and thermal deformation."

"I also guessed that this is the case." Professor Cai Chenning asked cautiously: "But no matter which alloy, thin to a thickness of 0.2 wire, it will be deformed with a touch of light."

"My disciple, by hand, grinded a very thin probe to test the hardness of the thread. I thought it would be deformed with a single touch, but the thread of this nut is not."

“It may be that the nano-scale coating increases the hardness. Plasma vapor deposition can be used to coat a diamond layer with a thickness of only a few nanometers.” Ye Qing, which was brought out by a group of top monsters, is not sure. .

Professor Cai Chenning, who has a slight understanding of this process, has been caught in a long smile.

Because Ye Qing said any kind of technology, they can't do it.

Not only can they not do in Zhongyun University, but none of the fine companies that Professor Cai Chenning knows can do this.

Therefore, he cheeked and called Ye Qing, and invited Ye Qing to eat.

Even the two-sleeve breeze on weekdays, the headmaster who almost never participated in the dinner, ran, and looked at Ye Qing.

"Ye Ye... In the end, can you make such a screw?" The principal Wang Hongnian of the elegant, blushing at this time. He is a typical old-school educator. He usually sees students, and they are all holding their own stereotypes.

Ye Qing is also his student. At this moment, President Wang Hongnian has a thick face and asked Ye Qing for help. There is always a feeling of complete destruction of the image.

Especially on the table, I also sat in the case of more than a dozen students.

But at this moment, no one is concerned about the image of the principal is not image.

Immediately, the face of Zhongyun University was gone. Now, in the campus forum, the mechanical engineering department has become a national sinner. This screw can't be done. They can't even find the object, and they care about the principal.

Everyone is watching Ye Qing with his eyes open, and Ye Qing is holding his chin. "It's simple to do the screw. The key is that I am graduating now. This academic exchange is a student at school."

Do the screws simple!

Do the screws simple...

When Wang Hongnian, the principal of the Japanese Polytechnic University, was summoned, he did not hear the following sentence. His brain was hot and he stood up from his chair. His expression was more exciting than he was the director of the Education Bureau: Get a screw out and learn the cocky guys."

“Ye Zong~ When I graduated, did the school have a postgraduate application form?” Professor Cai Chenning’s eyebrows flew up quickly, and excitedly kept picking up his hands.

"It seems that there is..." Ye Qing certainly remembers the form, but Ye Qing knows that he is not the piece of material. If he fills it, he will not pass it.

Professor Cai Chenning slammed a blank form on the rotary table.

"Welcome Ye Zong to our graduate school, you are not used for class, if it is not the **** procedure to go, just rely on your professional knowledge, directly take a doctorate is no problem." (To be continued., your support Is my biggest motivation.) 16-11-0112:12:54