Monster Factory - 381

Appearing in Ye Qing’s eyes, it was a silver-white standard hexagonal nut.

Pinching the nut gently, Ye Qing’s first reaction was that the nut was heavy.

A standard nut with the same size is about seven grams. Ye Qing often deals with these things and is very accurate about its weight. But starting with this nut, it weighs about 15 grams.

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

When Ye Qing pinched the alloy nut in his hand, looking at the overhead crystal lamp to observe the threads on the inner wall.

Ye Qing, who had been sharpened by the monsters, couldn’t help being surprised.

There is no thread in this nut.

The inside of some crystal nuts, under the light, presents a faint metallic reflection.

If there is reflection, it means there is a metal mirror. But the inner wall of a nut is as smooth as a mirror as a seamless precision tube.

A nut without thread, can this be called a nut, perhaps a metal washer is more appropriate.

What is a nut?

Nuts are the most common metal parts in modern industry and life. Nuts are equipped with screws, and the two are tightly combined to fix the object. Even first-grade children know the principle.

The inside of the nut is called the internal thread, and the above of the screw or bolt is called the external thread. Only two nuts and screws of the same specification can be connected together.

The diameter is the same, and the pitch between the threads is the same.

If there is no thread, how to tighten the connection with the screw?

Ye Qing believes that this kind of mistake that violates the common sense of physics is impossible to make. Since they proudly gave this nut as a gift, there must be something in this nut.

“Is there a magnifying glass?”

Professor Cai Chenning nodded solemnly, and handed over a Kaland 300x portable microscope.

A portable microscope with its own light source is usually used to observe the surface of jewelry and the surface roughness of metal materials. It is only the size of a mobile phone and is very suitable for carrying.

After adjusting the resolution and light source, Ye Qing aligned the lens of the portable microscope at the inner hole of the nut.

Ye Qing’s face also became serious. Under 300 times magnification, the inner hole of the nut that was originally as smooth as a mirror. There are actually a series of internally measured threads appearing, these threads are circled around, and the distance between the pattern teeth and the pattern teeth is so small that it is unbelievable.

Only under the observation of a 300 portable microscope can we barely see a trace of depression between the teeth.

How thin are these teeth?

The thickness of a strand of hair is 0.06 mm on average, but a strand of hair can be easily seen with the naked eye. If the hair strands are arranged neatly, leaving a gap of the same thickness in the middle, can the human eye see it?

Close observation, you can find clues. Ye Qing pulled a piece of his own hair down, put it under a portable microscope, and noted the focal length and approximate width in his mind, and then aimed it at the inner wall of the alloy nut.

Compared with hair strands, the thread pitch is so small that it is impossible to judge. This shows that the gap between the teeth is much smaller than one-tenth of the hair. As for how small it is, it has surpassed 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 wire.” Professor Cai Chenning gave the answer.

“No wonder.”

Ye Qing understood that human eyes can distinguish things that are much thinner than hair, and even silk can be seen under sufficient light source and contrast of different colors. But such a small thing has reached the limit of visual recognition.

A single silk is fine. If two silks are close together with a gap of the same thickness between them, the human eye will default to one.

The same principle applies to these threads in front of us. It is too thin, only one-thirtieth the thickness of hair.

Circles of ultra-fine threads surround, of course, have exceeded the visual recognition limit of the human eye, creating the illusion that there is no thread on the surface of the nut.

1 Hm is often referred to as 1 wire in industrial processing, and 1 wire is equal to 0.01 millimeter.

However, the precision of the current international five-axis machining center is usually 0.2 wire. The domestic accuracy is 0.8 silk.

This is only theoretical data. In actual operation, if you think of reaching the accuracy of 0.2 wire, you must adjust the machine tool to the best level, use the laser to set the tool from time to time, and automatically compensate for tool wear.

The nut in Ye Qing’s hand already represents the processing limit of an ordinary five-axis machining center.

“Open your eyes, who can imagine that Nikkei University of Science and Technology can make a nut like this?” Professor Cai Chenning said sadly: “When we got this nut, we still had students who didn’t know how to do it. The washers are not clearly distinguishable, so send a washer without thread, and say it is a nut.”

“Someone asked me, the commercial five-axis center can control the accuracy at 0.2 wire, then theoretically the accuracy can be controlled higher in the laboratory, why can’t a screw be made?”

Because this screw must be made in one go, and hundreds of threads invisible to the naked eye are processed on it.

The key is that you have to have a tool that can be tapped, not to mention the fact that it is not available in the market, I will make my own stupid words. It is far more difficult to make a tool that can tap a screw than to make a screw like this.

Also~ the thread of this screw or nut is too thin. If the factory machine tool gently cuts from the alloy steel, it will cut it to the thickness of a wire.

The cut off will never be a vertical metal piece, but a rolled skin like a lollipop.

This is due to factors such as metal stress, thermal deformation, cutting angle of the tool, metal toughness, and so on.

Professor Cai Chenning wondered, how did the Nikkei University manage to process hundreds of ultra-precision threads with only 0.2 wire pitch in a nut with a height of 5 mm?

The most important thing is that the threads processed by others are not deformed.

“The answer is the metal material used for this nut.” Ye Qing stared at the nut, which represents the most cutting-edge processing technology. The alloy material should be able to avoid metal stress and thermal deformation.”

“I guess that’s the case.” Professor Cai Chenning asked cautiously: “But no matter what kind of alloy is as thin as 0.2 wire, it will deform with a single touch.”

“The disciple I brought with me grinds out a very thin probe by hand to test the thread hardness. I thought it would be deformed with a light touch, but this nut has no thread.”

“It may be that the nano-level coating has increased the hardness. Using plasma vapor deposition, a diamond grinding layer with a thickness of only a few nanometers can be coated.” Ye Qing, who was brought out by a group of top monsters, said with some uncertainty. .

Professor Cai Chenning, who also knew a little about this craft, fell into a long wry smile alone.

Because they couldn’t do any of the technology that Ye Qing said.

Not only they couldn’t do it at Zhongyun University, none of the precision companies that Professor Cai Chenning knew could do it.

Therefore, he brazenly called Ye Qing to invite Ye Qing to dinner.

Even the principal, who was almost never involved in dinners, ran over and looked at Ye Qing eagerly.

“Ye Ye… President, then… can you make this kind of screw?” The elegant principal Wang Hongnian blushed a little at this time. He is a typical old-school educator, and when he sees students, he keeps his stereotyped and serious image with a sullen face.

Ye Qing is also his student. At the moment, Principal Wang Hongnian asks Ye Qing for help with a cheeky face. There is always a feeling that his image is completely destroyed.

Especially when there are more than ten students sitting on the table.

But at this moment, no one cares about the image of the principal.

Soon the face of Zhongyun University will disappear. Now in the campus forum, the Department of Mechanical Engineering has become a national sinner. They can’t make this screw. They can’t even find the target. Are there still time to care about the principal?

Everyone stared at Ye Qing with chin in his hands: “It’s easy to make screws. The key is that I am graduated now. This academic exchange meeting is for all students at school, right.”

It’s easy to make screws!

It’s easy to make screws…

President Wang Hongnian, who had summoned the wolf of Japanese University of Science and Technology, did not hear the next sentence at all. He got up from his chair bang with his head, his expression was even more excited than when he became the director of the Bureau of Education: “Mr. Ye Hurry up and make a screw and teach those arrogant guys severely.”

“Mr. Ye~ Didn’t the school send out a postgraduate application form when he graduated?” Professor Cai Chenning’s eyebrows were almost flying, and he kept rubbing his hands in excitement.

“It seems like…” Of course Ye Qing remembered the form, but Ye Qing knew that he was not the piece of material, and would not pass it after filling it in, so he rubbed it after changing hands.

Professor Cai Chenning snapped a blank form on the revolving dinner table.

“Welcome Mr. Ye to come to our school to study as a graduate student. You don’t use it for classes, or if you don’t have to go through that damn program, you can get a PhD directly with your professional knowledge.”