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Chapter 183 This is the value of talents

"Don't underestimate the installation of bearings. It directly affects accuracy, life, and performance. Therefore, the design and assembly departments must fully study the installation of bearings. Everyone obviously doesn't know much about this aspect. In the United States, no matter how big a company is,

It must be carried out in accordance with the following operating standards: first, clean the bearing and bearing related parts, then check the size and finishing of the related parts, and then install, that is, the bearing package can be opened before installation, and then the bearing is installed.

After inspection, lubricant will be supplied.”

Juniper first gave an overall explanation. Everyone nodded after listening and thought it made sense.

Norinco has formulated many regulations, the core of which is to follow procedures and not do whatever you want. Many workers were not accustomed to this method at the beginning. It was very troublesome, delayed things at critical times, and was inefficient.

.

However, Norinco strictly requires workers to do this, and it is a rigid standard. Anyone who dares to violate the minor regulations will be fined, and those who dare to violate the serious regulations will be fired. Of course, so far, there have been many fines and no dismissals. After all, no serious accidents have happened.

Procedure is of course very important, and it is also a condition for standardization. The reason why workers were not comfortable with it at the beginning was that the production scale was too small. But as the production scale grew larger and larger, proceduralization showed its advantages. China's

Industry lacks this kind of routine, so efficiency is low, and accidents often occur. This situation basically does not occur in the United States, Germany, and island countries.

Juniper clearly explained the procedural steps for bearing installation, and everyone thought it was very reliable.

Juniper continued.

"The first is the installation of cylindrical bore bearings. Europe and the United States generally use the press-in method. This method is applied to small bearings.

That is to insert the spacer block into the inner ring, and use a press to quietly press the inner ring until it is in close contact with the shaft shoulder.

Installing the inner ring with spacers on the outer ring will cause indentations and bruises on the raceway, so it is absolutely prohibited. During operation, you can apply oil on the mating surface in advance.

If it is absolutely necessary to use a hammer for installation, a spacer should be placed on the inner ring. This method is only suitable for use with small interference, and cannot be used for large interference, or medium or large bearings.

For non-separable bearings such as deep groove ball bearings, when the inner ring and outer ring need to be installed with interference, use spacers to pad them, and use screws or oil pressure to press in the inner ring and outer ring at the same time for alignment.

The outer ring of the ball bearing is easy to tilt. Even if it is not an interference fit, it is best to install it with spacers.

For separable bearings such as cylindrical roller bearings and tapered roller bearings, the inner ring and outer ring can be installed on the shaft and housing respectively. When combining the separately installed inner and outer rings, the key is to stabilize them

Bring the two together so that the centers of the two do not deviate. Forcibly pressing in will cause jamming of the raceway surface.

The second is the hot-fitting method, which is mainly used for large bearings. Because such large bearings require a lot of force to press in, they are difficult to press in.

Therefore, the hot-fitting method of heating the bearing in oil to expand it and then mounting it on the shaft is widely used. Using this method, the work can be completed in a short time without adding undue force to the bearing. Heating of the Bearing

The temperature is based on the bearing size and required interference amount. The relevant precautions for hot assembly operations are as follows:

First, the bearings must not be heated above 120°C;

Then, in order to prevent the bearing from directly contacting the bottom of the oil tank, you can consider placing the bearing on a metal mesh table or lifting the bearing;

Furthermore, the bearing must be heated to a temperature 20°C to 30°C higher than the required temperature, so that the inner ring does not become cold during operation and becomes difficult to install;

Finally, after installation, the bearing cools down and shrinks in the width direction, so it is necessary to use a shaft nut or other appropriate method to tighten it to prevent a gap between the inner ring and the bearing shoulder.

Installation of the third tapered bore bearing

Most of the inner rings of bearings with tapered holes are installed with an interference fit. The amount of interference is determined by the axial advancement distance of the inner ring on the conical shaft diameter, adapter sleeve or withdrawal sleeve.

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For small and medium-sized bearings, you can use bearing installation tools or locking nuts to push the inner ring to the appropriate position on the conical shaft diameter. When using an adapter sleeve, use a sleeve that can be locked with a hook wrench or impact wrench.

Nut. For the withdrawal sleeve, the bearing installation tool or end plate can be used to push it into the inner hole of the bearing.

Larger bearings require greater force to install, so hydraulic nuts should be used. Hydraulic nuts can install tapered bore bearings on tapered shaft diameters, adapter sleeves, and withdrawal sleeves."

Juniper explained in detail while pointing to the graphics on the blackboard.

After talking about installation, we started talking about disassembly.

"Bearing disassembly requires different disassembly tools and disassembly methods for different bearings. When the bearing has a tight fit with the shaft and a loose fit with the seat hole, the bearing and shaft can be removed from the housing together, and then

Use a press or other disassembly tool to remove the bearing from the shaft.

Here are some common bearing disassembly methods:

First is the disassembly of the outer ring..., then the disassembly of the inner ring... and then the disassembly...

Let me tell you about the use of bearings again. Bearings are precision components, but no matter how high-performance bearings are used, if they are used improperly, the expected results will not be obtained. The precautions for the use of bearings are as follows...

There are also common problems and countermeasures in the use of bearings. The first is the strong metal sound...

What to do if regular sounds appear……….

What should I do if there are irregular noises?

What to do if there is an abnormal temperature rise……….

What should I do if the rotational vibration of the shaft is large......"

The workers below listened with fascination. A few days ago, He Tao was talking about a new technology. Although it was very reasonable, after all, everyone had not been exposed to it yet, so it could only be regarded as broadening their horizons. But Juniper was talking about bearings.

Installation, disassembly and other issues are closely related to everyone's current work and can be applied immediately in practice, so in terms of practicality, Juniper's course has an immediate impact.

When Juniper finished speaking, the audience burst into the warmest applause. Juniper was sweating profusely and smiled. He is a very stable person. He studied basic industries in the United States. For him, basic industries are fundamental, no matter what.

Whether you are a CNC machine tool or a semiconductor company, in the final analysis, it is still based on basic industry. If the basic industry is not strong, there is no need to talk about all this. On the contrary, as long as the basic industry is strong, these will naturally appear, such as the new mold processing mentioned by He Tao

Technology must also be based on basic industry.

Liu Lang knew the course taught by Jun Song, but he did not have the details, so he also gained a lot from this class. The next step is for him to formulate relevant regulations based on the course taught by Jun Song, implement them all, and form a new

system.

This is the value of Du Song and He Tao. They have a lot of things in them. Today we are just talking about a very small part. Of course, compared with Liu Lang, they are far behind. They may have enough in the past two or three years.

But with the continuous development of northern industry, what they learn in school is not enough, so they still have to keep learning.


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