Heat Transfer from Solid Shaft to Bearing

In summary, preheating of a 4140, 2 inch diameter solid shaft material was done prior to welding of a linkage plate and attaching a bearing to the shaft. The temperature range during preheating was around 400 to 450 degrees celsius, while post heating was done at 560 to 570 degrees celsius followed by cooling. The nearest distance from the heat source to the bearing was 1.5 inches. It is important to consider the high temperatures induced by the welding process on the shaft, as it may affect the bearing. To calculate the heat transfer and rate from the heat source on the shaft and linkage plate to the bearing through conduction, the heat equation or thermal
  • #1
Michael Lim
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Preheating was carried out on a 4140, 2 inch dia. solid shaft material prior to welding of linkage plate and bearing was attached on the shaft. Temperature range is around 400 to 450 degree celsius. Welding was performed and followed by Post heating of temperature range 560 to 570 degree celsius and cooling. Bearing used is GEZ200ES. Nearest distance from heat source to the bearing is 1.5 inch. Under this situation, i would like to know whether the high temperature induced by the preheating, welding and post heating on the shaft will affect the bearing or not? Is there any formula we can use for calculating the heat transfer and rate from the heat source on the shaft and linkage plate to the bearing through conduction. In this way, we can know how much heat is induced on the bearing contact surface during the entire welding process?

Cheers
Michael
 
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  • #2
Michael Lim said:
Is there any formula we can use for calculating the heat transfer and rate from the heat source on the shaft and linkage plate to the bearing through conduction.

Indeed there is. It is called the heat equation:

http://en.wikipedia.org/wiki/Heat_equation

Good luck.
 
  • #3

1. How does heat transfer occur from a solid shaft to a bearing?

Heat transfer occurs when there is a temperature difference between two objects. In this case, heat flows from the hotter solid shaft to the cooler bearing until they reach thermal equilibrium.

2. What factors affect the rate of heat transfer from a solid shaft to a bearing?

The rate of heat transfer is affected by the temperature difference between the shaft and bearing, the material properties of the two objects, and the surface area and contact between them. Other factors such as lubrication and speed of rotation can also play a role.

3. How can heat transfer from a solid shaft to a bearing be minimized?

One way to minimize heat transfer is by using materials with low thermal conductivity, such as ceramic bearings. Proper lubrication can also help reduce heat transfer by reducing friction between the two surfaces. Additionally, increasing the surface area and improving the contact between the shaft and bearing can help dissipate heat more efficiently.

4. What are the consequences of excessive heat transfer from a solid shaft to a bearing?

Excessive heat transfer can lead to premature failure of the bearing due to increased wear and tear. It can also cause the lubricant to break down, reducing its effectiveness and potentially damaging the bearing. In extreme cases, excessive heat transfer can even result in melting or warping of the bearing, rendering it useless.

5. How can heat transfer from a solid shaft to a bearing be measured or monitored?

Heat transfer can be measured using temperature sensors placed on the shaft and bearing. These sensors can provide real-time data on the temperature difference between the two objects, allowing engineers to make adjustments to minimize heat transfer. Additionally, regular maintenance and inspections can help monitor the condition and performance of the bearing.

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