Monster Factory

Appears in leaf and green eyes and is a silver-white standard hexagonal nut.

Gently squeezed the nut, Ye Qing's first reaction was that it was heavy.

The same standard nut size as it is, about 7 grams. Ye Qing often deals with these things and is very accurate about their weight. But this nut is in hand and weighs about 15 grams.

The weight gain indicates that this nut is manufactured from a denser, harder alloy.

When Ye Qing pinched this alloy nut to his hand and pointed it at the top of his head crystal lamp to observe the inner wall thread.

Ye Qing, who had been polished out of her hard nerves by the monsters, could not bear to be surprised.

There are no threads in this nut.

Some crystalline nuts interior, under light, exhibit faint metal reflections.

Reflection means metal mirrors. But the inner wall of a nut is as smooth as a seamless precision tube.

Without a threaded nut, could this be called a nut, perhaps a metal washer would be more appropriate?

What is a nut?

Nuts are the most common metal parts in modern industry and life. Nuts with screws, both of which are tightly connected to the principle of fixing objects, even first-grade children know.

The inside of the nut is called the inner test thread and the outside thread is called on the screw or bolt. Only two equally sized nuts and screws can be connected together.

Same diameter, same spacing between threads.

If there are no threads, how do you tighten the connection to the screws?

This is a mistake that violates the common sense of physics. Ye Qing believes that Nippon Technologies cannot make it. Now that they are proud to present this nut as a gift, it must have a quintessence inside it.

“Do you have a magnifying glass? ”

Professor Tsai Chenning nodded seriously, handing over a 300x portable microscope from Kalander.

Portable microscopes with their own light sources are commonly used to observe jewellery surfaces, and metal material surface roughness. It is only the size of a phone and is perfect for carrying.

Adjust the resolution and light source, Ye Qing will aim the lens of the portable microscope at the inner hole of this nut.

Ye Qing's face also became serious. At 300x magnification, it looked like a mirror-smooth nut inner hole. There is actually an internal test thread that circles around, and the spacing between the teeth is incredibly small.

Three hundred portable microscopes can barely see between the teeth, with a dented trace.

How thin are these teeth?

The average thickness of a hair silk is 0.06 mm, yet a hair silk can be easily seen with the naked eye. If one hair is arranged neatly, leaving a gap of the same thickness in the middle, can the human eye see it?

Close to carefully observe, you can discover Tian Ni. Ye Qing dragged one of his own hair down, placed it under a portable microscope to observe, and noted the focal length and approximate width in his heart, then aligned it to the inner wall of the alloy nut.

The thread spacing is too small to be judged compared to hair silk. This suggests that the gap between the teeth is much smaller than a tenth of the hair silk, and that the visual analysis of the human eye has been exceeded in terms of how small it is.

“We measured it with a laser interferometer with a thread spacing of 0.2 threads and a thread depth of 3 threads.” Professor Chenin Cai gave the answer.

“No wonder. ”

Ye Qing understands that the human eye can discern something much thinner than hair silk, and can even see silk in contrast with adequate light sources and different colors. But something so tiny has reached the limit of naked eye recognition.

A single silk silk is okay, if the two silk silks are leaned together, leaving a gap of the same thickness in the middle, the human eye will default to one.

These threads in front of you are the same principle. It's really too thin, only about a third of the hair is thick.

A circle of ultra-thin threads wrapped around it has naturally exceeded the visual recognition limit of the human eye, creating the illusion that this nut surface is free of any threads.

1 nm, in industrial processing, is often 1 wire and 1 wire equals 0.01 mm.

Now the accuracy of the International Five-Axis Processing Center is usually 0.2 filaments. Domestic precision is 0.8 filaments.

This is just theoretical data. In practice, if you want to reach the precision of 0.2 filaments, you have to adjust the machine tool to the optimal level and use lasers to automatically compensate the knife for wear and tear.

This nut in Ye Qing's hand already represents the processing limit of a normal five-axis processing center.

“Open your eyes, who can imagine a nut like this at the Nippon Institute of Technology?” Professor Cai Chenning said with some sadness: “When we got this nut, we still had students who didn't know how to do it. We laughed at the fact that the Nippon Polytechnic University couldn't even tell the difference between the nut and the washer. We sent a non-threaded washer, which was hard to say the nut. ”

“I was also asked if the commercial five-axis center could actually control precision at 0.2 threads, then theoretically in the lab, it could control precision more, why couldn't it build a screw? ”

Because of this screw, it has to be made with hundreds of invisible threads.

The key is that you still have knives that you can tap into. Don't say anything stupid that you can't buy on the market, I'll make it myself. Making a knife that can tap screws is much harder than making a screw like this.

And ~ the teeth on this screw or nut are too thin, if the factory machine cuts a knife from the alloy steel, it cuts the thickness of a wire.

That slice of cut off, will it never be a vertical piece of metal, but a roll like lollipop?

This is metallic stress, thermal deformation, cut-in angle of the cutter, metal toughness, and so on.

Professor Tsai Chenning wondered, how did the Nippon Polytechnic University, in a five-millimeter nut, process hundreds of ultra-precision threads with only 0.2 silk spacing?

The threads processed by the most critical people are not yet deformed.

“Answer on the metal material used for this nut.” Ye Qing stared at this nut, which represents the most sophisticated processing technology, and said softly: “Japan is quite tree-building in a special alloy, ordinary metals are not resistant to high temperatures, the alloy materials they use should avoid metal stress, and thermal deformation. ”

“I guess so, too.” Professor Cai Chenning asked carefully: "But whatever alloy, thin to 0.2 silk thickness, will touch and deform. ”

“The disciple I brought, hand grinding out an extremely thin probe to test the hardness of the thread. I thought it was deformed with a gentle touch, but the thread on this nut was not. ”

“It may be that the nanoscale coating adds hardness, employing a plasma vapor deposition method, and can be coated with a layer of diamond abrasive only a few nanometers thick.” Ye Qing, brought out by a group of top monsters, said with some uncertainty.

Professor Tsai Chenning, who also had a slight understanding of this process, was caught in a long and bitter laugh.

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

Not only could they not do it at Zhongyun University, but none of the precision industries that Professor Cai Chenning knew could do it.

Therefore, he called Ye Qing with a thick face, to invite Ye Qing to dinner.

Even the two sleeve breeze during the weekday, the principals who almost never participated in the dinner came and looked at Ye Qing.

“Leaf… total, can you… make such a screw?” Principal Wang Hongnian of Joya, is a little blushed at the moment. He is a typical old-fashioned educator who sees students, all with his face bandaged to maintain his stereotypical and serious image.

Ye Qing is also his student. At this time, Principal Wang Hongnian asked Ye Qing for help with his old face. There was always a feeling that his image was completely destroyed.

Especially on the table, where more than a dozen students are sitting.

But at this point, nobody cares about the headmaster's image.

Soon the face of Zhongyun University will be 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 target, and there is no reason to care about the principal?

Everyone looked at Ye Qing in the eyes and Ye Qing held his chin: “It's easy to screw. It's important that I graduate now. This academic exchange is for students at school, right? ”

It's easy to screw!

It's easy to do screws…

President Wang Hongnian, who had summoned this wolf from the Japanese Polytechnic University, did not hear the last sentence. His brain was hot and he stood up from his chair. His expression was even more exciting than he had become the director of the Bureau of Education: “President Ye quickly made a screw out and taught those arrogant guys a hard lesson. ”

“President Ye ~ Didn't the school send out a postgraduate application form at the time of graduation?” Professor Cai Chenning's eyebrows were flying and he was thrilled to rub his hands.

“There seems to be...” Ye Qing of course remembered that form, only Ye Qing knew he was not that material, filled it out and wouldn't pass, and rubbed it.

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

“Welcome Ye to graduate school, you don't have to come to class, if not for that damn program to leave, with your expertise, it's fine to get a PhD directly. ”