Note: Shrink Fitting of Roller Bearings
Objective:
To heat a roller bearing assembly for a shrink fitting application
End Product:
roller bearing
Equipment:
Ambrell 7.5 kW, 150-400 kHz induction power supply, equipped with a remote heat station containing two 1.5 μF capacitors (for a total of 0.75 μF
Materials:
Steel tubes 7 in OD x 4.75 in ID x 5in heat zone
Type-A thermocouple to measure temperature
Thermal blanket
Temperature:
500, 800, 1000 *F (260, 427, 538 °C)
Frequency:
166 kHz
Testing:
Initial tests were completed on a sample without a thermal blanket. A thermocouple is slipped between the copper ring and the steel tube to measure temperature. The part measured 4.940 in (at room temperature with an ID gauge.) The part reaches 1000F (538C) in about 10 minutes.
Benefits:
The part measures 4.975 in at 1000 °F yielding an expansion of 0.035 in (4.975 minus 4.94). At 500 and 800 °F the expansion numbers were 4.950 and 4.964 respectively.
When using a thermal blanket the heat time is reduced by about 90 seconds (8.5 minutes as opposed to 10 minutes).
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