Liu Lang's low-end products are actually not low-end, the bearings he made are not the original Liu Donglai's bearing factory to manufacture those "waste", he is to manufacture bearings that can be used in the second generation of machine tools, the reason why it is called low-end refers to this kind of bearing can be extended downward, it is possible to make some downstream products manufactured by other enterprises, such as bearing blanks, etc., this downstream product North Industries Group disdains to do, but it can not be without, just can be left to other enterprises.

A seven-day Spring Festival holiday has passed, everyone's mood quickly recovered from the lively Spring Festival to the intense work, the second week began, North Industry has entered a high-intensity work state, but everyone is also used to it, are young people, the oldest is only about forty years old, the youngest is twenty-four or five years old, plus the food is very good, everyone's energy is very strong, this week tried to make more than 200 high-quality knives, the scrap rate is less than one percent, but it is still a bit high, the reason is that the workers still have some small problems with some details, but the problem is not big, Liu Lang wants to reduce the scrap rate to less than 0.5 percent。

A knife put on the table to look at the bright eye-catching, the workers are very excited, they know that the quality of these knives, than the tools used in the old machine tools before is much better, just in terms of service life, the design is three times higher, in fact, there is no need to look at the design, they are all experts, touch the edge of the knife to know how strong this thing is.

But that's just the beginning, and the rest of the work is important.

In the spacious conference room on the seventh floor, all the employees of NORINCO Group, including the employees of Shencheng No. 3 Machine Tool Factory and Jinling Machine Tool Factory Branch, totaled more than 350 people sitting there quietly, drawing all kinds of bearing graphics on the huge blackboard in front of everyone, and there were also different styles of bearings on each row of tables.

Workers like to listen to Liu Lang's class, one is to learn the latest knowledge, to know that Liu Lang's knowledge is not in the domestic textbooks can be learned, this is the world's advanced level, after learning is an expert, the second is Liu Lang's class is a "multi-dimensional" teaching, not to mention, but also live demonstration, each course for an hour and a half, but we do not have any impatience, as if a blink of an eye has passed.

"Okay, I'm calling you here today to teach you a lesson, I remember the last time I gave you a lesson, it's been two months ago, it feels like it's been a long time, why is it so long? Actually, I have to study myself, because I don't have anything to teach you anymore. ”

Liu Lang's words made everyone laugh, Liu Lang is most lacking money, followed by the knowledge in his head, even Chen Wei of Huaxia Industrial Technology is the same as a primary school student in front of him.

"You don't have to laugh, today's lesson is what I have recently learned in a hurry, and I will talk about it while I still remember it, otherwise I am afraid that I will forget so many graphics and knowledge." ”

There are more than ten different styles of bearings drawn on the blackboard, and there are dense explanations next to them, these contents are really Liu Lang spent three days to draw and write, because he is not tall, and the blackboard is tall, more than three meters high and more than five meters long, so Liu Lang also made a very delicate shelf for himself, you can stand on it and sit and write.

"Okay, without further ado, let's go to class!"

All the employees had already taken pens and books and kept copying them, and they all raised their heads when they heard Liu Lang's words.

"Obviously, what we are learning today is bearings, and what is drawn on the blackboard is more than ninety percent of the types of bearings in the world at this stage, a total of fourteen kinds, I believe most of us know, such as this bearing!"

Liu Lang pointed to a bearing figure in the top corner with a metal rod.

"Zhang Mingda, do you know what kind of bearing this is?"

Liu Lang called someone.

"Angular contact ball bearings with a contact angle of fifteen degrees!"

The other party replied.

"Very good, Lao Zhang, how do you know?"

Liu Lang's "incredible" expression caused a burst of laughter.

"Mr. Liu, you talked about this bearing before!"

The other party was a little embarrassed.

"Have you talked about it? Have I talked about these things before? How do I remember it? Song Yi, have you learned this?"

"Mr. Liu, there are only four of us who have learned before, and the others have not been studied, but at that time, you just briefly talked about it and did not explain it in detail. ”

"I thought I had a memory problem, that's good, that's good!"

Liu Lang's acting skills are absolutely first-class, of course, he is just to liven up the atmosphere.

"Lao Zhang is right, this is an angular contact ball bearing, and it is a fifteen-degree angle.

There is a contact angle between this bearing ring and the ball, the standard contact angle is 15 degrees, 30 degrees and 40 degrees, the larger the contact angle, the greater the axial load capacity, the smaller the contact angle, the more conducive to high-speed rotation, the single row bearing can bear radial load and unidirectional axial load. Structurally, two single-row angular contact ball bearings with a backside combination share the inner and outer rings, and can bear radial loads and bidirectional axial loads.

The single row is used in the spindle of machine tools, high-frequency motors, gas turbines, front wheels of small cars, and the pinion shaft of differentials, while the double row is used in oil pumps, air compressors, and various transmissions. ”

Because it is used on the spindle of the machine tool, everyone knows about this bearing, and they have disassembled many machine tools.

"This kind of bearing everyone has seen, very good, this we may not have seen, is a self-aligning ball bearing, the appearance is a double row of steel balls, the outer ring raceway is an inner spherical type, can automatically adjust the shaft misalignment caused by the deflection or discenter of the shaft or shell, the tapered bore bearing can be easily installed on the shaft through the use of fasteners, mainly bearing radial load, commonly used in woodworking machinery, textile machinery transmission shaft, vertical mounted self-aligning bearing.

This is a spherical roller bearing, this kind of bearing is equipped with spherical rollers between the outer ring of the spherical raceway and the inner ring of the double raceway, according to the different internal structures, it is divided into four types: R, RH, RH and SR, which is the international usage, because the arc center of the outer ring raceway is consistent with the center of the bearing, it has self-aligning performance, so it can automatically adjust the shaft misalignment caused by the deflection or misalignment of the shaft or shell, and can bear radial load and two-way axial load, which is commonly used in papermaking machinery, deceleration device, rolling mill gearbox seat, rolling mill roller table, Crushers, vibrating screens and vertical mounted spherical bearings.

This is a thrust spherical roller bearing, the spherical rollers are obliquely arranged in this kind of bearing, because the raceway surface of the housing ring is spherical, it has self-aligning performance, so it can allow the shaft to have a number of inclinations, the axial load capacity is very large, and it can also bear a number of radial loads while bearing the axial load, and oil lubrication is generally used when using.

This is a deep groove ball bearing, in the structure of each ring of the deep groove ball bearing has a continuous groove raceway with a cross-section of about one-third of the equatorial circumference of the ball, the deep groove ball bearing is mainly used to bear radial load, can also bear a certain axial load, when the radial clearance of the bearing increases, it has the nature of angular contact ball bearing, can bear the axial load of alternating in two directions. Compared with other types of bearings of the same size, this type of bearing has a small friction coefficient, high ultimate speed and high precision, and is mainly used in automobiles and other equipment.

This is a thrust ball bearing......... This is a thrust roller bearing......... This is a cylindrical roller bearing...... This four-point contact ball bearing...... This is a thrust cylindrical roller bearing......... This is a thrust needle roller bearing......... This is a mounted outer spherical ball bearing......... This is a thrust tapered roller bearing .......... ”

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