It was March 1991 in a blink of an eye. The early spring chill had not left, but the factory building of Norinco was full of warmth. The workers gathered around several brand-new machine tools and pointed, and a few people even left.
Touch it with your hands before going up.
"Is this the CNC machine tool that Mr. Liu and the others always talk about? Good guy, it is indeed larger than our manual machine tools, and it even has a "warehouse" in it."
A worker said to the person next to him.
"Warehouse? Are you confused? That's the control system. Although we have never used this equipment, Mr. Liu told us a lot. Return to the warehouse? Is there all poop in it?"
Another person said contemptuously.
"You really have no sense of humor. I didn't know it was the control system?"
The other party curled his lips and answered.
"Mr. Du is here, Mr. Du, how much does this CNC machine tool cost? Isn't it cheap?"
Juniper walked in from outside, and everyone hurriedly asked.
"Of course it's not cheap. One unit costs more than 3 million yuan, and these units cost more than 16 million yuan in total!"
"What? More than sixteen million? So expensive?"
Everyone took a breath of air.
"Let me do the math. My annual income is more than 12,000 yuan, more than 16 million yuan. Even if it is 16 million yuan, it will take me more than 1,400 years to earn it.
, more than 1,400 years, oh my god, it’s less than a thousand years from the Qing Dynasty to now, right?”
A man was shocked by his own account.
"Qing Dynasty? How old is the Qing Dynasty? Counting from the Tang Dynasty, yours has no culture, really no culture!"
The other person was obviously better at history than he was.
Juniper smiled and said.
"Actually, the price of these CNC machine tools abroad is not high. One machine costs only more than 100,000 US dollars, which is about 1 million yuan when converted into RMB. However, when sold to us, it costs more than 3 million yuan. Do you know why?"
"Why?"
everyone asked.
"It's very simple, because we can't manufacture it. Our machine tools from Norinco are considered the best, but there is still a generation gap between them and CNC machine tools.
And let me tell you, these CNC machine tools were only products of West Germany ten years ago and can only be used as lathes. They now have lathes and grinding integrated CNC machine tools with higher precision and can produce many things that we cannot imagine.
of parts.
We can't make it ourselves, and we still need it very much, so we can only buy it from the other party at a high price. Let alone three million, even four million will have to be endured. If we fall behind, we will be beaten, and if we fall behind, we will be slaughtered. This is
Reality, there is no way!”
Juniper's words silenced everyone, and that was indeed the truth.
"How awesome is this thing? We can't build it?"
One worker was a little unconvinced.
"Everyone can take a look!"
At this time, Liu Lang walked in from the outside. He had just hung up the "Big Brother" in his hand and put it aside.
"Mr. Liu is here!"
Liu Lang was wearing a jacket, which he bought when he went to the United States last month. It was rare in Fucheng. At this time, he was already over 1.6 meters tall. This height was already considered an adult standard, even in the north.
He is not the shortest person in the industrial group. His height has completely surpassed Liu Lang's previous life at the same age. Even compared with some junior high school students, it is not much different.
With a height of 1.6 meters, he no longer looks like an eleven-year-old child. Of course, this is not unusual. In Liu Lang's previous life, many sixth-grade boys could grow to 1.7 meters. It's just a bit rare in this era.
, after all, the food of this era cannot be compared with that of more than 20 years later.
Liu Lang came to a machine tool, asked the workers to connect the power supply, and then took the rough raw materials and placed them on the operating table.
After Liu Lang performed a series of operations on the operation panel, the knife head began to rotate and moved the knife against the rough material.
Everyone is watching. They are now experienced industrial workers and have a very keen sense of the path of the knife. Even if the knife is only doing the simplest cutting, it is an eye-opener for them.
"Sure enough, it is much more accurate. The accuracy must be improved at least ten times. It's amazing!"
"High technology is high technology, awesome!"
Everyone praised him again and again.
After a while, the machine stopped, and Liu Lang picked up the rough embryo and placed it in front of everyone. The carvings were breathtaking.
"It's so precise. I'm convinced. Why is this machine tool so powerful?"
Everyone has never seen a CNC machine tool, but they have heard of it before, but seeing it is better than hearing it. Today, I was immediately convinced when I saw it.
"We know that the tool path control of CNC machine tools is carried out by computer programs. Computers are of course much more powerful than our human brains."
Juniper on the side explained.
"Computer? Not just a computer, look at this tool, but also the entire body of the CNC machine tool. From design to casting, it is completely better than ours."
Another worker touched the machine tool and admired it.
Liu Lang's eyes lit up after hearing this. It seemed that his workers had begun to master the essence of machine tools.
"Yes, the reason why CNC machine tools are so precise is that control is one aspect, but this is only one aspect. The first is the design of the machine tool, which is the soul of the machine tool's accuracy. This machine tool does not look like anything special, but it is highly precise and durable.
Its grasp of design details is superb.
The second is machine tool castings. A machine tool casting is the skeleton, which is the key to withstand cutting torque and disperse vibration forces, and is the basis for the stability of the entire machine. High-precision machine tools, without good castings, will not even have the best spindle screw.
The accuracy of the guide rails and the entire machine will be gone after a year.
The third is that the control system determines the key accuracy of the machine tool, which is the so-called computer control. The accuracy of the machine tool refers to the shape, mutual position and relative motion accuracy of the main components of the machine tool, including geometric accuracy, transmission accuracy, motion accuracy, and positioning accuracy.
and accuracy retention and other aspects.
Various types of machine tools can be divided into ordinary precision level, precision level and high precision level according to their accuracy.
The above three precision levels of machine tools have corresponding accuracy standards. If the tolerance is one for the ordinary level, the approximate ratio is one to 0.4 to 0.25. In the design stage, the accuracy of the machine tool is mainly used to allocate components.
and material selection to improve the accuracy of machine tools.
The first is geometric accuracy. Geometric accuracy refers to the shape, mutual position and relative movement of the main components when the machine tool is not moving (the machine tool spindle is not rotating or the workbench is not moving, etc.) or the movement speed is low under no-load conditions.
Accuracy. Such as the straight line of the guide rail
degree, the radial runout and axial movement of the spindle, the parallelism or perpendicularity of the spindle center line to the moving direction of the slide, etc. Geometric accuracy directly affects the accuracy of the processed workpiece and is a basic indicator for evaluating the quality of machine tools. It is mainly determined by the structure
Design, manufacturing and assembly quality.
Then there is motion accuracy, which refers to the accuracy of the main parts of the machine tool when it moves at the speed of the working state. For example, the rotation accuracy of the high-speed rotating spindle. For high-speed and precision machine tools, motion accuracy is an important indicator for evaluating the quality of machine tools. Movement
Accuracy and geometric accuracy are different. It is also affected by movement speed (rotation speed), gravity of moving parts, transmission force and friction. It is related to factors such as structural design and manufacturing.
The other is transmission accuracy. Transmission accuracy refers to the coordination and accuracy of the relative motion between the end-effectors of the machine tool transmission system. The error in this aspect becomes the transmission error of the transmission chain. For example, when a lathe is turning threads, the spindle moves every time.
After one turn, the movement amount of the tool holder should be equal to the lead of the dry thread.
.But in fact, due to the error in the transmission chain between the spindle and the tool holder, the error between the actual displacement of the tool holder is the transmission error of the lathe thread transmission chain. The transmission accuracy is determined by the design of the transmission system, and the ideal displacement exists
Determined by errors, manufacturing and assembly accuracy of transmission parts.”
Liu Lang took this opportunity to explain the secret of the precision of CNC machine tools.