Chapter 376: Nuts manufactured by the most advanced industrial technology (1/2)
Appearing in Ye Qing's eyes, it was a silver-white standard hexagon nut. Picking up the nut gently, his first finding was that the nut was heavy. The standard nut with the same size was about seven grams. He often dealt with these things and was very accurate in grasping its weight. But starting with this nut, it weighed about 15 grams. The increase in weight indicated that this nut was made of a higher density high-hard alloy.
When Ye Qing pinched this alloy nut in his hand and aimed at the crystal lamp above his head to observe the inner thread, already hardened by monsters, he could not help but be surprised. There was no thread in this nut. Inside the crystal nut, under the light, there was a faint reflection of metal.
With reflection, it means there was a metal mirror. The inner wall of the nut was as smooth as a mirror, like a seamless precision tube. A nut without thread. Can this be called a nut, perhaps a metal washer is more appropriate?
What is this nut?
Nuts are the most common metal parts in the modern industry and life. Nuts and screws, the two are tightly combined together to fix the principle of objects, even the first-grade children know. The inside of the nut is called an internal test thread, and the top of the screw or bolt is called outside 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 believed that Japan Science and Technology could not make such a mistake that would violate the common sense of physics. Since they proudly gave this nut as a gift, there should be something in this nut.
”Is there a magnifying glass?”
Professor Cai Chenning nodded a little seriously and handed a Carland 300x portable microscope.
A portable microscope with a light source is usually used to observe the surface of jewelry and the roughness of metal materials. It is only the size of a mobile phone and is very suitable for carrying.
After adjusting the resolution and the light source, Ye Qing aligned the lens of the portable microscope with the inner hole of the nut, and his face also became serious. At 300 times magnification, the inner hole of the nut, which was originally as smooth as a mirror. There was even a thread of internal tests, these threads are surrounded by a circle, the spacing between the pattern teeth is too small to be incredible.
Under the observation of the portable microscope of three hundred, it was possible to barely see a trace of depression between the lines and teeth. How fine were these striated 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 the hairs are lined up neatly and there are gaps of the same thickness in the middle, can it be seen by the human eye?
”We have measured with a laser interferometer, and the thread pitch is 0.2 wires, and the thread depth is 3 wires.” Professor Cai Chenning gave the answer.
”No wonder.”
Ye Qing understood the human eye could distinguish much thinner things than the silk of hair. Under sufficient light source and contrast of different colors, even silk could be seen. But such a small thing has reached the limit of visual recognition.
For one single silk, it is okay. 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 him. It is too thin, only one-thirtieth of the hair silk.
A circle of ultra-fine threads surrounded, as a matter of course, the visual recognition limit of the human eye has been exceeded resulting in the illusion that the surface of this nut did not have any thread.
1 millimeter, in industrial processing, is often referred to as 1 wire which is equal to 0.01 mm.
The accuracy of the current international five-axis machining center is usually 0.2 wires. The domestic accuracy is 0.8 silk.
This is only theoretical data. In actual operation, if you want to reach the accuracy of 0.2 wires you must adjust the machine tool to the best level, use the laser to adjust the tool and the tool wear is automatically compensated.