The first thousand one hundred and forty-five chapters headed for CNC machine tools
Liu Lang is explaining the knowledge of CNC milling machines to everyone.
“What we want to learn is down milling and up-cut milling. What impact do these two methods have on cutting forces?
During up milling, the vertical cutting force acting on the workpiece is always upward and has a tendency to lift the workpiece, which can easily cause vibration and affect the clamping of the workpiece. This situation is particularly prominent when milling thin-walled and poor-stiffness workpieces.
During down milling, the vertical cutting force acting on the workpiece always presses the workpiece, which is beneficial to the clamping of the workpiece.
What effect does it have on the elastic deformation of the tool?
When an end mill is used to cut the workpiece contour by down milling, the reaction force of the workpiece on the tool points in the direction of the tool, and the elastic deformation of the tool causes the tool to "give way".
When an end mill is used to up-mill the workpiece contour, the reaction force of the workpiece on the tool is directed toward the inside of the contour, and the elastic deformation of the tool causes the tool to "gnaw the knife".
The smaller the diameter of the tool and the longer the tool holder is extended, the more obvious the phenomenon of "knife giving" and "knife biting" will be.
Therefore, when down milling is used for roughing, less finishing allowance can be left. When uphill milling is used for roughing, more finishing allowance must be left to prevent the workpiece from being scrapped due to "knife chewing".
What are the effects on tool wear?
The vertical milling component of down milling presses the workpiece toward the workbench, and the cutter teeth slide against the machined surface, resulting in little friction, which is beneficial to reducing cutter tooth wear, work hardening, and surface roughness.
In addition, during down milling, the cutting thickness of the cutter teeth is from maximum to zero, which causes the cutter teeth to have a greater impact when cutting into the workpiece. Especially when the surface of the workpiece to be processed is rough or has hard skin, it will cause greater vibration in the cutter body. ……….”
How to choose between down milling and up milling?
How to control the accuracy of turning slender shaft?
How to improve deformation?
Analysis of factors causing bending deformation in turning slender shafts………….
What causes deformation due to cutting forces?
What are the effects of cutting heat?
What are the measures to improve the machining accuracy of slender shafts?
Liu Lang clearly explained the problems that would arise during the operation of the CNC milling machine in front of him.
After such a long time, the employees of Norinco Group have already become familiar with CNC machine tools. Now it seems that the originally high-end equipment is just that. Liu Lang disassembled several CNC machine tools and all the internal structures were displayed in front of everyone. , there is nothing magical about it. It requires people to operate it and skilled technology. Without people, this thing is just a pile of scrap metal.
Of course, the components that make up CNC machine tools are very precise, especially the servo system. Few people understand the operating principles. Norinco has established an engineering chip R&D department. As the person in charge, Lin Hai launched a challenge to this system. In July this year Recruited more than a dozen undergraduate and graduate students from the School of Electronics at Capital University.
Computer research in universities started very late, and no computer major has yet been established. Of course, the education department has already begun preparations. Computer majors will be established in several universities such as Huaxia University and Capital University by next year at the latest. This is different from the previous The world is a full two years ahead of schedule.
Although there are no students majoring in computer science, the quality of students majoring in electronics is also very high. They are the first batch of students in the country to come into contact with computers. They may not have systematically learned computer knowledge, but the essence of computers is electronic components.
The country's technology in electronic components is very powerful, especially in the past few years, SMIC has changed the overall level of the country, which has also greatly promoted education in colleges and universities, and Liu Lang's book "Digital Survival"
It has been widely circulated in colleges and universities and has become an important elective course.
"Digital Survival" is of great significance to college students, especially those majoring in electronics. It can be said that this book has played a huge role in improving domestic college students' understanding of computers and even digital technology. Many people are familiar with this book.
Students who have read this book have a rough overview of the development of computers. They know the future development direction of computers and know that this knowledge will have a huge impact on the entire world in the future.
Of course, there are many students who do not believe that what is described in the book will happen within ten or twenty years, but there are also some people who firmly believe in it and are determined to devote themselves to it and use their wisdom to change the entire world.
Obviously, these students have become the first batch of "new human beings" in China who have "awakened" to the consciousness of computers and even artificial intelligence. This can be said to be ideological enlightenment. This has laid the foundation for the country's future computers. The country has also recognized this, so
We have begun to establish a computer major and are now organizing teaching staff. These people are the first generation of computer experts in the country. They are now old, but when they learned that the country needed them, they still rushed out without hesitation. Huaxia University has already "reserved"
Liu Lang's schedule asked him to give a speech to the first batch of students next year.
Even though the country has not yet designed computer courses, the rapid development of the chip industry in recent years has affected all aspects. Therefore, in Liu Lang's view, the level of the college students recruited by the company is no less than that of ordinary computer courses ten years later.
Professional students, as long as they are given enough resources, these students will definitely bring a big surprise to Norinco.
In December 1991, Fucheng experienced its first heavy snowfall, and the weather suddenly became cold. It was a Saturday, and all members of Norinco had a holiday except for those on duty. In Fucheng and even the entire country, only Norinco had a weekend off.
Nowadays, some people in the country have proposed to implement the weekend system nationwide, and various regions have begun investigations. I am afraid that when people discuss the weekend system in more than ten years, they will definitely talk about NORINCO.
The heavy snow stopped in the evening, and the staff on duty immediately came out with brooms to sweep away the snow.
Liu Lang, Wang Zhendong and Sun Hu walked out of the office building. The staff on duty quickly stood at attention when they saw the three people.
"Lao Yan, Lao Hou, you are busy, let's go out for a walk."
Wang Zhendong waved his hand to signal the other party.
There are four people working as janitors for Norinco Group, two of whom work one shift for a day. They are not the workers originally recruited. Two of them are employees of the original bearing factory, and the other two are employees of the machine tool factory, and Liu Lang's
His parents used to be colleagues, and they also took care of Liu Lang's parents, but their families were very difficult.
, there are parents and children living in poverty, and the small wages in the factory can't support the whole family. Later, they found Liu Lang's parents who wanted to find a job. They didn't seek wealth but food and clothing. If they were Liu Lang's relatives,
It didn't work out, but Liu Lang agreed to the four men, and Liu arranged for them to work as guards.
It sounds like they are just janitors, but the janitors of Norinco Group also have to receive training, and their salary is not low, 410 yuan per month, 150 yuan higher than their previous salary, and there is also a salary at the end of the year.
A performance bonus of 1,000 yuan, this income has reached twice the average salary of urban employees in Fucheng City.
Therefore, there is a saying in Fucheng that the guard dog of Norinco earns more than the monitor of the Mining Bureau.
This sentence smacks of discrimination, but more of it is jealousy and envy.