Rolling bearing heating installation details - bearing knowledge

When bearing installed when the inner diameter of the bearing is greater than 70 mm, or the interference fit is bigger, often by heating method, expansion in the bearing hole, this will save time when installation, also avoid the damage caused by excessive force bearing, etc. At this time the need to control the temperature of heating is, generally speaking, the bearing heated to 80 ℃, the highest to 100 ℃ is enough. More than 120 ℃ could lead to the phenomenon of tempering of the bearings, so that the hardness and precision of the lower ring. A, bearing heating of the commonly used methods are: 1, bearing heating Heating method: electric heating board as long as bearing placed in a temperature of 100 ℃ hot plate on a few minutes, this method is the most simple and convenient, if you turn over a few times to make a bearing heated evenly, and the efficiency is high, regardless of the size of the bearing can use this method to heat. 2, - bearing heat Electric furnace heating method: put the bearings are placed in a closed automatic temperature control of electric furnace for heating, uniform heating, accurate temperature control, this method and heating quickly, suitable for the occasion of a group of heating a lot of bearing. 3, - bearing heat Induction heating method: this method using induction heater can be fast, reliable and clean the bearing heated to the required temperature, this method is particularly suited to the occasion of the inner ring tight fit, but also because of the heated just within the circle, and outer heating is very less, so that it can be easily installed on the shaft, it is easy to load a hole. 4, - bearing heat Light bulb heating method: this method is the use of 50 w bulb to heating bearing, ensures that the temperature of the heated at 100 ℃ or so, for a small bearing can be directly on the bulb, larger bearing can be in the cone of the light bulb enclosure, conical cover is can prevent heat losses of light bulbs, and make the heating is very uniform. Bit cone cover device can be adjusted in a certain range can be adapted to the different size of bearing heating. If it is used far infrared light bulb, pay attention to the direction of the light bulb should be down, to avoid the infrared radiation harm to people's eyes. This kind of bulb can be energy saving. Bulb heating method is suitable for less quantity and often do not want to undertake to the bearing heating, usual cases also can be used as a light bulb, moreover does not need any other equipment. 5, - bearing heat Oil tank heating method: this method is widely used on the a traditional heating method, in a setting at the bottom of the tank from 50 to 70 mm metal mesh, bearing is on the Internet, big bearing to hang with hooks. Bearing is not suitable for direct put on the bottom of the channel, to prevent contact with the bottom of the channel of the bearing parts of the local heating temperature is too high, or the bottom of the channel in the precipitation dirt into the bearing. With oil tank heating method of the key points are as follows: should use non-corrosive thermal stability good mineral oil, had better be to use the transformer oil, oil, and the container should keep a good clean. Tank capacity should be heated with the size of the bearing oil and decide, if the container is too small, in continuous operation, a into the bearing oil temperature will drop quickly, the effect will be bad. Bearing heating temperature to control well, high temperature bearing may damage, low temperature may be enough to make the expansion of the ring, cause the effect is not significant. 80 to 100 ℃ heating temperature of the thermal expansion of the inner diameter of the inner ring, this quantity for have the bearing of the over surplus quantity of the ordinary is already enough. But to reach the required heating temperature, bearing installation will be as soon as possible, so as to avoid bearing cooling and the installation difficulties and so on. When bearing cooling in the width direction will shrink, so to install, to a certain pressure of the inner ring to the shoulder pressure operation, and with a very thin after bearing cooling feeler to do the simple test, to see if inside is a gap between end face and shoulder, etc. To sum up, in the bearing installation requires action skilled, rapid and accurate.