Liu Lang is explaining the knowledge of CNC milling machine to everyone.

"We're going to learn about end-milling and conventional milling, what is the effect of these two methods on the cutting forces?

The vertical cutting component acting on the workpiece is always upward, and there is a tendency to lift the workpiece, which is easy to cause vibration and affect the clamping of the workpiece, which is particularly prominent when milling thin-walled and poorly stiff workpieces.

The vertical cutting component acting on the workpiece always presses down on the workpiece during climb milling, which is beneficial for the clamping of the workpiece.

What is the effect on the elastic deformation of the tool?

When the end mill is used to cut the contour of the workpiece, the reaction force of the workpiece to the tool is directed to the direction of the tool, and the elastic deformation of the tool makes the tool produce the phenomenon of "giving the tool".

When the end mill is used to cut the contour of the workpiece, the reaction force of the workpiece to the tool is directed to the inside of the contour, and the elastic deformation of the tool causes the tool to produce the phenomenon of "gnawing the tool".

The smaller the diameter of the knife and the longer the blade, the more obvious the phenomenon of "let the knife" and "gnaw the knife" become.

Therefore, when climb milling is used for roughing, the finishing allowance can be reduced. When conventional milling is used for rough machining, more finishing allowance must be left to prevent the workpiece from being scrapped due to "gnawing knife".

What are the effects on tool wear?

The vertical milling component of the down-milling pushes the workpiece towards the worktable, and the cutter teeth slide with the machined surface, and the friction phenomenon is small, which is beneficial to reduce the wear of the cutter teeth, reduce the work hardening phenomenon and reduce the surface roughness.

In addition, the cutting thickness of the cutter tooth is from the maximum to zero during the down milling, so that the impact force of the cutter tooth when cutting into the workpiece is larger, especially when the surface of the workpiece to be processed is a blank or has a hard skin, the cutter body will produce a larger vibration ............. ”

How to choose between climb milling and conventional milling?

How to control the accuracy of the slender axis of turning?

How can I improve my deformation?

The analysis of the factors of bending deformation caused by turning slender shafts .............

What are the causes of deformation due to cutting forces?

What is the effect of cutting heat?

What are the measures to improve the machining accuracy of slender shafts?

Liu Lang made it clear and clear that the problems that would occur in the operation of the CNC milling machine in front of him were clear.

After such a long time, the employees of North Industries Group have long been familiar with CNC machine tools, and now it seems that the original tall equipment is just the same thing, Liu Lang dismantled several CNC machine tools, all the internal structures are shown in front of everyone, there is nothing magical about it, people are needed to operate, skilled technology is needed, no one this thing is a pile of scrap iron.

Of course, the components that make up CNC machine tools are very precise, especially the servo system, few people understand the principle of operation, North Industries Group has set up an engineering chip research and development department, Lin Hai as the person in charge to challenge the system, in July this year in the capital University recruited more than a dozen undergraduate and graduate students of the School of Electronics.

Of course, the education department has already begun to prepare, and at the latest next year, it will set up computer majors in several colleges and universities such as Huaxia University and Capital University, which is two years ahead of the previous life.

Although there are no computer students, but the quality of electronics students is also very high, they are the first batch of students in the country to contact computers, may not have systematically learned the knowledge of computers, but the essence of computers is electronic components.

The country's technology in electronic components is very powerful, especially in recent years, SMIC has changed the overall level of the country, which has also greatly promoted the education of colleges and universities, and Liu Lang's book "Digital Survival" 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 college students majoring in electronics, it can be said that this book has played a huge role in improving their understanding of computers and even digital technology for domestic college students, many students who are familiar with this book have a general summary of the development of computers, they know the future development direction of computers, and know that this science will have a huge effect on the whole world in the future.

Of course, there are many students who do not think that the description in the book will happen in ten or twenty years, but there are also some who believe in it and are determined to devote themselves to it and use their wisdom to change the whole world.

Obviously, these students have become the first batch of "new humans" in China who have "awakened" the consciousness of computers and even artificial intelligence, which can be described as ideological enlightenment, which has laid the foundation for the country's future computer, and the country has also recognized this, so it began to set up a computer major, and is now organizing teachers, these people are the country's first generation of computer experts, and now they are old, but when they learned that the country needs them, they still rushed out without hesitation, and Huaxia University has been "booked" Liu Lang's itinerary allowed him to give a speech for the first batch of students next year.

Even if the country has not yet designed a computer course, but because the rapid development of the chip industry in recent years has affected all aspects, so in Liu Lang's view, the level of these college students recruited by the company is no less than that of ordinary computer students ten years later, as long as they are given enough resources, these students will definitely bring a big surprise to NORINCO.

In December of 91, Fucheng ushered in the first heavy snowfall, the weather was suddenly cold, this day was Saturday, the North Industries Group was on holiday except for the staff on duty, the whole Fucheng and even the whole country only the North Industries Group took weekends, and now the country has proposed to implement the weekend system nationwide, and the various places have begun to investigate, I am afraid that more than ten years later, people will talk about the North Industries Group when discussing the weekend system.

When the heavy snow stopped in the evening, the staff on duty immediately came out with brooms to clean up the snow.

Liu Lang, Wang Zhendong and Sun Hu walked out of the office building, and the staff on duty hurriedly stood up after seeing the three.

"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 who guard the door to the North Industries Group, two people are in a shift for a day, they are not the workers recruited at the beginning, two are employees of the original bearing factory, and the other two are employees of the machine tool factory, and Liu Lang's parents used to be colleagues, and also took care of Liu Lang's parents, but their families are very difficult, there are old and small living in poverty, and the wages in the factory alone can not support the whole family, and then found Liu Lang's parents and wanted to find a job, not to seek wealth but to seek food and clothing, if it is Liu Lang's relatives, this matter is not successful, but these four people Liu Lang agreed, Liu let them arrange to work as a doorman。

It sounds like they are janitors, but the janitors of the NORINCO Group also have to be trained, and their wages are not low, 410 yuan per month, 150 yuan higher than their previous salary, and there are also 1,000 yuan of performance bonuses at the end of the year, which has reached twice the average salary of urban workers in Fucheng City.

Therefore, there is a saying in Fucheng that the "dog" of the guard of the North Industries Group is more earning than the squad leader of the Mining Bureau.

This phrase smacks of discrimination, but more of it is jealousy and envy.