Detailed introduction of rolling bearing heating

When the bearing is installed with an inner diameter of more than 70mm, or when the interference is large, the heating method is generally used to expand the bearing hole, so that the installation saves time and labor, and avoids excessive force. And the damage caused by the bearing.

At this time, it is necessary to control the heating temperature. Generally, the bearing is heated to 80 ° C, and the highest is 100 ° C. Exceeding 120 °C may cause tempering of the bearing, which will reduce the hardness and accuracy of the ferrule.

First, the common methods of bearing heating are:

1, bearing heating - electric heating plate heating method:

As long as the bearing is placed on a hot plate with a temperature of 100 ° C for a few minutes, this method is the most simple and convenient. If it is turned over several times, the bearing can be heated evenly and the efficiency is high. This method can be used regardless of the size of the bearing. heating.

2, bearing heating - electric furnace heating method:

The bearing is placed in a closed automatic temperature-controlled electric furnace for heating. This method is uniform in heating, accurate in temperature control, and fast in heating, and is suitable for a batch of bearings that heat a lot of bearings.

3, bearing heating - induction heating method:

This method utilizes an induction heater to quickly, reliably and cleanly heat the bearing to the desired temperature. This method is particularly suitable for applications where the inner ring is tightly fitted and because the inner ring is heated and the outer ring is heated. Very small, so that it can be easily mounted on the shaft and easily inserted into the seat hole.

4, bearing heating - bulb heating method:

This method uses a 50W bulb to heat the bearing to ensure that the heating temperature is around 100 °C. For smaller bearings, it can be placed directly on the bulb, and larger bearings can be placed in the cone of the bulb. The hood prevents heat loss from the bulb and makes the heating very uniform. The cone cover can also be adjusted up and down, and can be adapted to heat bearings of different sizes within a certain range. If you are using a far-infrared bulb, be aware that the direction of the bulb should be down to avoid infrared rays from damaging the human eye. This kind of bulb can save energy. The heating method of the bulb is suitable for occasions where the number of bearings is small and the bearings are not often heated. In normal cases, the bulb can also be used for illumination, and no other equipment is required.

5,  bearingheating - oil tank heating method:

This method is a widely used traditional heating method. A metal mesh is placed 50 to 70 mm from the bottom of the oil groove, the bearing is placed on the net, and the large bearing is also hung with a hook. The bearing is not suitable for direct placement on the bottom of the groove to prevent the part of the bearing contacting the bottom of the groove from being locally heated too high, or the dirt deposited at the bottom of the groove enters the bearing. The key points of the oil tank heating method are as follows: Non-corrosive mineral oil with good thermal stability should be used. It is best to use transformer oil. Oil and container should be kept clean. The capacity of the oil tank should be determined by the size of the heated bearing and the amount of oil. If the container is too small, in a continuous operation, the temperature of the oil placed in the bearing will drop rapidly, and the effect will be poor.

Second, the main points of the bearing heating installation method:

1. The temperature of the bearing heating should be well controlled. If the temperature is too high, the bearing may be damaged. If the temperature is too low, the expansion of the ferrule may be insufficient, resulting in insignificant effect. The amount of thermal expansion of the inner diameter of the inner ring obtained by the heating temperature of 80 to 100 ° C, which is already sufficient for a bearing having a general interference amount.

2. Once the required heating temperature is reached, the bearing installation should be carried out as soon as possible to prevent the bearing from cooling and installation difficulties.

3. When the bearing is cooled, it will shrink in the width direction. Therefore, when installing, apply a certain pressure to press the inner ring to the shoulder, and after the bearing is cooled, use a very thin feeler to make it. Simple inspection depends on whether there is a gap between the end face of the inner ring and the shoulder.

In summary, the bearings are required to be proficient, quick and accurate when installed.

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Identification method of imported automobile bearings

 Automobile bearings generally use imported bearings, so the imported automotive bearings are still very good, the quality is very good, domestically produced automotive bearings are relatively cheaper, and now many imported bearings are of good quality, such as NSK imports. Bearings and FAG bearings, as well as SKF bearings are suitable for automotive bearings.
With the continuous increase in the number of domestic car ownership, the demand for the use of auto parts and auto accessories has also increased. However, there are many large and small parts and accessories stores in China, and the goods are mixed. Many counterfeit and shoddy products are mixed. , causing the loss of the owner, and even serious people may even cause casualties.
In order to let the owner have a certain understanding of the characteristics of the accessories and supplies of the various factory brands, introduce the identification methods of various types and accessories of major automobile brands to the owners of the owners.
It is no exaggeration to call a bearing a joint of a car. In a car, not only its four legs - the wheels need to use bearings, but the machine parts that will rotate are indispensable for the participation of the bearings, it is a very inconspicuous but significant thing in the transmission system.
Because of the large amount of work, its wear is also relatively high, so replacing bearings is a common thing in car maintenance. Walking in the auto parts market, we found that the bearing stores that operate various brands are like a lot of hair. However, the quality of the bearings they sell is really the same as the brand on the packaging. This question probably wandered many times in the hearts of every car owner. Here are a few common ways to identify the quality of a bearing:
Whether the outer packaging is clear:
Under normal circumstances, the factory brand has its own special designer to design the external packaging, and arrange the production conditions of the factory to produce, so the packaging is very clear from the line to the color block, unambiguous.
Whether the steel printing is clear:
Brand letters, labels, etc. will be printed on the bearing body. The font is very small, but most of the products produced by the factory use the stamping technology, and the type is pressed before the heat treatment, so the font is small, but the recess is deep and very clear. The fonts of counterfeit products are not only blurred, but because of the rough printing technology, the fonts float on the surface, and some can even be easily erased by hand.
Is there a noise:
Hold the inner sleeve of the bearing with your left hand and turn the outer sleeve with your right hand to make it rotate to hear if it has noise. Since most of the counterfeit products are out of production conditions and completely hand-worked, it is inevitable that impurities such as sand will be incorporated into the bearing body during the production process, so that noise will be generated when rotating. This is the biggest difference between a factory brand that strictly enforces production standards and operates with machines.
Is there any turbid oil on the surface:
This should be especially noted when purchasing imported bearings. Since the current domestic anti-rust technology is not particularly good at home, it is easy to leave a thick oil trace when the bearing body is rust-proofed, and it is sticky and sticky on the hand, and the bearings imported from abroad are almost invisible. To the traces of anti-rust oil, it is particularly careful that the imported bearings smell a smell, and it is definitely anti-rust oil, just can't see it.
Whether the chamfer is uniform:
The so-called chamfering of the bearing, that is, the intersection of the horizontal surface and the vertical surface, the counterfeit bearing is unsatisfactory in the processing of these corners due to the limitation of production technology.

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