In a steel plant, rolls work under high load and high temperature.
After long use, the roll and bearing can become very tight.
In this project, a roll could not be removed during maintenance.
Working Condition
- Application: rolling mill maintenance
- Part: roll and bearing
- Fit: tight fit between shaft and inner ring
Because of this, the roll was hard to remove.
Problem on Site
During shutdown, the team tried to remove the roll.
They found:
- The bearing was stuck on the shaft
- The roll did not move
- The process took a long time
They tried several times but failed.
This caused delay in maintenance.
Old Method
The team used:
- Flame heating
- Hammering
- Manual tools
But:
- Heat was not even
- Temperature was hard to control
- There was risk of damage
- The result was not stable
Sometimes, the roll was still stuck after heating.
Need for a New Method
The plant needed a better way.
They wanted:
- Faster removal
- Less risk
- Easy operation
- Same result every time
So they looked for a new solution.
Solution Used
They used an induction heating system.
On site:
- The inner ring was heated
- The heat was even
- The fit became loose
- The roll was removed
No strong force was needed.
Result After Change
After using this method:
- The roll was removed in one time
- The process was faster
- No damage was found
- The work was safer
The team could finish the job on time.
Simple Comparison
|
Item |
Old Way |
New Way |
|
Time |
3–4 hours |
40–60 minutes |
|
Heating |
Not even |
Even |
|
Control |
Hard |
Easy |
|
Risk |
High |
Low |
|
Result |
Not sure |
Stable |
Use in Later Work
After this, the plant used the same method again.
The result was the same.
This shows the method is stable and can be used many times.
Summary
This case shows:
- Even heat helps remove the roll
- Good control makes the work safe
- A stable method saves time
Contact
If you have the same problem:
- Roll stuck
- Bearing hard to remove
- Slow maintenance
WTR can help.
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Tell us your working condition
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