What is the method of induction heating?

What is the method of induction heating?

Induction heating method

By applying the principle of electromagnetic induction, an induced current is generated in the inner ring of the bearing, causing it to heat up and expand, thereby creating a gap 

at the fitting point and achieving the purpose of easy disassembly. Due to the rapid, uniform, clean and pollution-free induction heating, high heating quality, and ensuring that 

bearings are not damaged, this advanced disassembly method is gradually replacing baking, oil boiling and other methods.

Bearing disassembly, of course, means removing the entire bearing from the shaft.

The disassembly of bearings should be carried out with the same care as during installation. Be careful not to damage the bearings and their components, especially the 

disassembly of interference fit bearings, which is difficult to operate. So, in the design phase, it is important to consider in advance the convenience of disassembly, and it is 

also crucial to design and manufacture disassembly tools as needed. During disassembly, study the disassembly method and sequence according to the drawings, investigate 

the fitting conditions of the bearings, and ensure that the disassembly operation is foolproof.

1. Disassembly of outer ring

Disassemble the outer ring of the interference fit, and set several outer ring compression screws on the circumference of the shell in advance. Tighten the screws evenly while 

disassembling. These screw holes are usually covered with blind plugs, tapered roller bearings, and other separable bearings. Several notches are set on the housing shoulder, 

and a cushion block is used to disassemble them with a press or gently tapping. (Used for angular contact bearings)

2. Disassembly of cylindrical bore bearings

The disassembly of the inner ring can be done using pressure machinery to pull out the latest and simplest method. At this point, it is important to ensure that the inner ring 

bears its pulling force.

The inner ring of large bearings is disassembled using hydraulic pressure method. Oil pressure is applied through oil holes set on the shaft to facilitate pulling. Bearings with a large width can be disassembled using both hydraulic pressure and drawing tools.The inner ring of NU and NJ cylindrical roller bearings can be disassembled using induction heating method. The method of heating the local area in a short period of time to expand the inner ring and then pulling it out.

3. Disassembly of taper hole bearings

Disassemble a relatively small bearing with a tightening sleeve, support the inner ring with a stopper fastened to the shaft, turn the nut back a few times, and then use a cushion 

block and hammer to disassemble.

Large bearings are easier to disassemble using hydraulic pressure. The method of disassembling bearings is to pressurize and send oil through the oil hole on the tapered shaft to expand the inner ring. During operation, there is a possibility of the bearing suddenly coming out. It is best to use the nut as a stopper.