"Don't underestimate the installation of bearings, it directly affects accuracy, life, Performance, therefore, the design and assembly department for the installation of bearings to fully study, we obviously do not understand this aspect, in the United States, no matter how large the company, must be carried out in accordance with the following operating standards: first to clean the bearing and bearing related parts, then to check the size and finishing of the related components, and then to install, that is, before the installation of the bearing packaging, then after the installation of the bearing, after the supply of lubricant. ”

Juniper first gave a general explanation, and everyone nodded after listening to it, thinking that it made sense.

NORINCO has formulated a lot of charters, the core of which is to do things according to the procedure, don't do what you want to do, many workers are not suitable for this way at the beginning, not to mention that it is very troublesome, and it is not efficient to delay things at critical times.

However, NORINCO is strictly required to do this, it is a hard standard, who dares to violate the light fines, the heavy ones are fired, of course, so far there are a lot of fines, and the dismissals have not been, after all, there have been no serious accidents.

Of course, the procedure is very important, which is also a condition of standardization, at the beginning the workers are not very suitable for the reason that the scale of production is too small, but as the scale of production is getting larger and larger, the program reflects the advantage, China's industry lacks this kind of programming, so the efficiency is low, and there are often accidents, this situation in the United States, Germany and island countries basically do not appear.

Juniper explained the programmed steps of bearing installation clearly, and everyone felt that it was very reliable.

Juniper continued.

"First of all, the installation of cylindrical bore bearings, Europe and the United States generally use the method of press pressing, which is applied to small bearings.

The cushion is inserted into the inner ring and quietly pressed with a press until it is in close contact with the shaft shoulder.

Placing the outer ring on the cushion block and installing the inner ring is the cause of indentation and crushing on the raceway, so it is absolutely prohibited. When operating, it is possible to apply oil to the mating surface beforehand.

As a last resort, when you have to use a hammer to hit the installation, you should put a cushion block on the inner ring. This practice is only limited to the use of small interference, and cannot be used for large interference, or medium and large bearings.

For non-separating bearings such as deep groove ball bearings, when the inner ring and outer ring need interference installation, the inner ring and the outer ring are pressed into the inner ring at the same time with a screw or hydraulic pressure. The outer ring of the self-aligning ball bearing is easy to tilt, and even if it is not an interference fit, it is best to install it with a cushion block.

For example, cylindrical roller bearings, tapered roller bearings and other separating bearings, the inner ring and outer ring can be installed on the shaft and the shell respectively, and when the inner ring and the outer ring are installed separately, the key is to close the two steadily, so that the center of the two does not deviate, and the reluctance to press in will cause the raceway surface to be stuck.

The second is the method of hot assembly, which is mainly applied to large bearings, because such large bearings require a lot of force when pressing, so it is difficult to press in.

For this reason, it is widely used to heat the bearing in oil, expand it, and then attach it to the shaft. With this method, the work can be completed in a short time without adding undue force to the bearing. The heating temperature of the bearing, based on the size of the bearing and the amount of interference required. The relevant precautions for hot charging operation are as follows:

First of all, the bearing must not be heated above 120°C;

Then, in order to keep the bearing from directly touching the bottom of the oil groove, you can consider placing the bearing on the metal mesh platform or lifting the bearing;

The second is to heat the bearing to 20°C-30°C higher than the required temperature, so that the inner ring will not be cooled during operation, which is difficult to install;

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

Mounting of the third tapered bore bearing

For bearings with tapered bore, the inner ring is mostly mounted in an interference fit. The amount of interference is determined by the axial advance distance of the inner ring on a conical shaft diameter, adapter sleeve or withdrawal sleeve.

Small and medium-sized bearings can be advanced into position on the conical shaft diameter using a bearing mounting tool or with a lock nut. In the case of adapter sleeves, socket nuts that can be locked with a hook wrench or impact wrench are used. The withdrawal sleeve can be pushed into the bearing bore with a bearing mounting tool or end plate.

Larger bearings require more force to mount, so hydraulic nuts should be used. The hydraulic nut can be used to mount the tapered bore bearing on the conical shaft diameter, on the adapter sleeve and on the withdrawal sleeve. ”

Juniper elaborated as he pointed to the graphics on the blackboard.

After talking about installation, I started to talk about disassembly

"The disassembly and disassembly of bearings should adopt different disassembly tools and disassembly methods for different bearings. When the bearing fits tightly with the shaft and loosely fits with the housing bore, the bearing can be removed from the housing along with the shaft and then removed from the shaft with a press or other dismounting tool.

Here are a few common bearing dismounting methods:

The first is the removal of the outer ring......... , followed by the disassembly of the inner ring......... After that, the ......... of unloading.

Let me tell you about the use of bearings, bearings are precision components, but no matter how high-performance bearings are used, if they are not used properly, they will not get the expected results, and the precautions for the use of bearings are ............ below.

There are also common problems and solutions in the use of bearings, first of all, there is a strong metal sound ..........

What to do if there is a regular sound..........

What should I do if there is an irregular abnormal sound..........

What should I do if there is an abnormal temperature rise..........

What should I do if the rotation vibration of the shaft is large.......... ”

The following workers listened to it with fascination, a few days ago He Tao talked about a new process, although it is very reasonable, but after all, everyone has not been contacted, it can only be regarded as broadening their horizons, but Juniper is talking about the installation and disassembly of bearings, which is closely related to everyone's current work, and can be immediately applied to practice, so on practicality, Juniper's course is immediate.

When Juniper finished speaking, the scene sounded the warmest applause, Juniper sweated profusely and smiled, he is very steady, in the United States are all basic industries, for him basic industry is fundamental, whether you are CNC machine tools or semiconductor enterprises, in the final analysis, or built on the basic industry, the basic industry is not strong, all this is not to talk about, on the contrary, as long as the basic industry is strong, these will naturally appear, than how Tao said that the new mold processing technology is also on the basic industry.

Liu Lang knew the course taught by Juniper, but he did not have the details of the other party, so he also gained a lot from this class, and the next step was to formulate relevant regulations according to the course taught by Juniper, implement all of them, and form a new system.

This is the value of Juniper and He Tao, there are still a lot of things on the two, and what we are talking about today is only a very small piece, of course, the two of them are far behind Liu Lang, and they may be enough in the past two or three years, but with the continuous development of North Industry, what they learn in school is not enough, so they still have to keep learning.

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