Analysis of rolling bearing heating device method

Source: Bearing network time: 2014-05-18

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When the inner diameter of the bearing is greater than 70mm; or the cooperation interference is large; the heating method is used to make the bearing hole swell; this device saves labor and time; also prevents damage caused by excessive force.
At this time, the demand is to control the heating temperature; usually the bearing is heated to 80 Â° C; up to 100 Â° C. It is enough. Exceeding 120 Â°C will lead to the appearance of bearing tempering; resulting in a decrease in the hardness and accuracy of the ferrule. Commonly used heating methods are:
1 Heating plate heating method Place the bearing on a hot plate with a temperature of 100 Â°C for a few minutes; this method is the most concise; if it is turned over several times, the bearing can be heated evenly; and the power is also high; the large-size bearing can be used This method.
2 Electric furnace heating method The bearing is placed in the closed active temperature control electric furnace for heating; uniform heating; precise temperature control; fast heating; suitable for a batch of heating many bearings.
3 Induction heating method The induction heater can quickly, firmly and cleanly heat the bearing to the required temperature; this is uniquely suitable for the inner ring tight cooperation; because only the inner ring is heated; the outer ring It has little heat; it can be easily mounted on the shaft; it is also easy to fit into the seat hole.
4 Bulb heating method Use 50W bulb to heat the bearing; ensure the heating temperature is about 100 Â°C; the smaller bearing can be placed directly on the bulb; the larger bearing can be placed in the cone of the bulb; the cone can be Prevent heat loss of the bulb; make the heating even. The cone cover can be adjusted up and down; in a certain scale, it can get used to heating the bearing with different size. If the far infrared bulb is used; pay attention to the direction of the bulb should be downward; avoid infrared rays is not conducive to Human eye. This kind of light bulb can save energy. The bulb heating method is suitable for occasions where the quantity is small and not often needed to heat the bearing; the ordinary light bulb can also be used for lighting; in addition, no other equipment is required.
5 Oil tank heating method This is a widely used traditional heating method; the oil tank is provided with a metal mesh at 50~70mm from the bottom; the bearing is placed on the net; the large bearing should be hung with a hook. The bearing should not be placed directly at the bottom of the groove; The part of the bearing part at the bottom of the anti-touch groove is heated too high; or the dirt deposited at the bottom of the groove enters the bearing. The key points of the oil groove heating method are as follows; mineral oil with good non-corrosive thermal stability should be used; the best is transformer oil; oil Both the container and the 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 much, the è¯¹ é‡ é‡ ç° ç° ç° æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢ æ¹ƒèƒ«å²¢
The heating temperature of the key 1 heating temperature should be handled properly; if the temperature is too high, the bearing will be damaged; if the temperature is too low, the ferrule will be inflated in a large amount; the effect is not obvious. The inner diameter of the inner ring is obtained by the heating temperature of 80-1000 Â°C. A large amount of inflation; this is about bearings with normal interference; it is already enough.
2 arrive at the required heating temperature; it is necessary to carry out the device as soon as possible; avoid the cooling and the device is difficult.
3 The bearing is also shortened in the width direction when cooling; therefore, the device must apply a certain pressure to press the inner ring to the shoulder; and after cooling, test with a very thin feeler gauge; can the inner ring end face and the shaft There is a gap between the shoulders. Totally; the butterfly is demanding, agile and precise.

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