"Okay, then I'll take a look and study it together." Liu Chi nodded, took the USB flash drive handed over by Li Haiqing, and plugged it directly into his office computer.
When the four saw Liu Chi operating the computer, they also gathered around.
Liu Chi clicked several times on the screen, found the folder, and clicked to open it.
Half a minute later, Liu Chi exited the computer and said, "This screen is too small. It's not convenient. Let's go to my lab to watch it."
"......"
"Fuck."
"Wow, Liu Chi, your laboratory is really advanced."
"How much does it cost?"
“He’s a local tyrant.”
"Okay, let's do the business first. You can build one yourself later." Liu Chi said as he turned on the control computer of the service cluster.
"You said it was easy, how much does it cost?"
"Not much. There is a server cluster on the upper floor worth more than 100 million. These devices add up to about 10 billion."
"Depend on...!"
"Stop talking about it. It's annoying."
"!!!"
"......"
Liu Chi shook his head helplessly, inserted the USB drive into the USB port, and opened the folder he had just viewed.
"Are you using the Three-Machine Heart?" Liu Chi looked at it for a few seconds, frowned and asked.
"Yes, the three-machine core can ensure accuracy and balance very well."
"The three-axis movement can indeed guarantee accuracy very well, but if the shaft and bearing accuracy are not good, it will have the opposite effect." Liu Chi zoomed in on the shaft and pointed at the bearing on the screen and said, "What is the accuracy here? Does it meet your design requirements?"
“The data is OK.”
"Are all the four bearings above and below okay?"
"no problem."
After watching for half an hour, Liu Chi asked in confusion: "Have you ever considered the effect of temperature?"
"The temperature???"
"You haven't considered this, have you?" Liu Chi said, adding, "Heat expands and cold contracts, brother?"
"We will naturally take this into consideration, but this is already the highest precision bearing we can buy, and we asked the manufacturer, and they said they can meet our requirements." Chen Song said with a lack of confidence.
"They say, you just believe it, have you been tested?"
"We are not like you, who have a ready-made laboratory." Li Haiqing said with contempt.
"That's true." Liu Chi nodded and said, "The lack of accuracy is basically a material problem."
"The main reasons for machine tool accuracy are generally divided into three points: 1. Changes in workshop ambient temperature; 2. Heat from the motor and friction from mechanical movement."
“3 The influence of cutting heat and cooling medium causes uneven temperature rise in various parts of the machine tool, resulting in changes in the shape accuracy and processing accuracy of the machine tool.”
Seeing that the three of them were silent, Liu Chi said, "Let me give you an example. When processing a 70mm×1650mm screw on a CNC milling machine with normal precision, the cumulative error of the workpiece milled between 7:30-9:00 in the morning and the workpiece milled between 2:00-3:30 in the afternoon can reach 85um."
"Under constant temperature conditions, the error can be reduced to 40um!"
"For example, a precision double-end surface grinder used for double-end surface grinding of thin steel sheet workpieces with a thickness of 0.6 to 3.5 mm can achieve a dimensional accuracy of mm when processing a 200mm×25mm×1.08mm steel sheet workpiece during acceptance, and the curvature is less than 5mm in the entire length."
“But after one hour of continuous automatic grinding, the size change range increased to 12mm, and the coolant temperature rose from 17°C when the machine was turned on to 45°C.”
“Due to the influence of grinding heat, the spindle journal is stretched and the clearance of the spindle front bearing is increased.”
"......"
"So there is no way to solve this problem?" Li Haiqing asked unwillingly.
Liu Chi thought that he had connections with the higher-ups, and maybe they could help him, so he asked the three people, "By the way, what grade of bearings are you using now?"
"P2! This is the highest level you can buy."
"What we bought is imported." Chen Song added.
"That should be fine, but in my opinion, the accuracy of your bearing still cannot meet the requirements of your design. Under the action of three forces, at room temperature, the accuracy error is at least more than 0.05MM."
"And I just looked at your design requirements, your accuracy is 0.03MM."
"What should I do? This is already the highest precision bearing?" Li Haiqing scratched his head in embarrassment.
"If there is no way to solve the bearing problem, I think the accuracy of using one movement will be higher than the three you use."
"Think about it. With one movement, there are only two bearings. Now you use three movements, so there are six bearings on the movement, plus four on the shaft, which becomes 10. Tolerance + tolerance, you also have to consider the effect of force. Isn't the error even greater?"
"I think what Liu Chi said makes sense." Li Haiqing said to Xiao Yunhao.
"How about we try to make one first?"
"Can."
"I can also ask for you if there are any bearings and movements with better precision." Liu Chi said and closed the folder on the screen.
"OK."
"Come on, it's almost time for dinner. I'll treat you guys to dinner."
"Wait, wait, one kettle for each person."
"You guys..." Liu Chi rolled his eyes.
"Fight the landlords and divide the land. I must take one back when I come here. It's my fault that I couldn't grab it online." Li Haiqing said righteously.
"Okay, I'll give you one." Liu Chi shook his head helplessly.
"......"
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