Effective Use and Management of Hot Rolling Mill Rolls

Hot rolling mill rolls are vital for the steel industry. Their use and management directly affect production efficiency and product quality. This guide covers essential aspects of hot strip back-up rolls, including selection, installation, daily inspection, maintenance, bearing replacement, spacing adjustment, and replacement cycles.

hot rolling mill rolls

Backup Roller Selection

When choosing a backup roller, consider the following:

Material: Opt for materials like high carbon alloy steel or stainless steel for their hardness, wear resistance, and corrosion resistance.

Diameter: Choose based on the hot-rolled strip’s width and thickness. Larger diameters offer better rigidity and load-bearing capacity.

Length: Ensure the roller’s length exceeds the strip’s length to provide full support.

Surface Treatment: Treat the surface for wear and corrosion resistance to extend service life.

Installation and Debugging
Follow these steps for proper installation:

Inspect the roller for defects like cracks or deformation.
Install the roller according to design requirements and ensure it is firmly positioned.
Adjust the distance between rollers to meet design specifications.
Conduct a trial run to ensure smooth operation and absence of abnormal noise.

Daily Inspection
Regularly inspect the support roller to ensure normal operation:

Check for surface wear and replace if necessary.
Inspect bearings for looseness or damage and repair or replace as needed.
Listen for abnormal running noises and stop the machine for inspection if detected.
Lubricate the roller regularly to maintain smooth operation.

Maintenance
Maintain the support roller to extend its service life:

Clean the surface regularly to remove dust, rust, and other impurities.
Lubricate bearings regularly to prevent wear.
Perform regular inspections and maintenance.
Conduct thorough inspections during downtime to identify and resolve potential issues.

Replace Bearings
Replace worn or damaged bearings promptly to ensure proper roller operation:

Turn off the roller and move it to a safe area.
Remove bearing seat bolts and the bearing seat itself.
Clean and install a new bearing seat and bearings.
Adjust bearing clearance and tighten bolts.
Conduct a test run to check for normal operation.

Adjust Spacing
Adjust support roller spacing based on production needs:

Determine the required roller groups and spacing range.
Use precision tools to measure existing spacing accurately.
Calculate the needed spacing adjustments based on measurements and process requirements.

Backup Roller Replacement Cycle

The replacement cycle depends on steel amount and surface hardening. Service life varies by roller. Replacement cycles may be weekly, bi-weekly, or longer. Typically, replace when output reaches around 60,000 tons. Replaced rollers require grinding, inspection, and bearing checks.

In summary, effective management of hot rolling mill rolls involves careful selection, installation, regular inspection, and maintenance. Proper handling ensures longevity and efficient operation, contributing to overall production success.

 

 

MM GROUP is one of the professional roll manufacturing base in China, which supply all kinds of large-size rolls for iron and steel enterprises with production capacity of 100,000 tons of all kinds of hot strip mill rolls, section mil rolls, rod mil rolls, cold rolling m rolls, casting and forging backup rolls.

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