Wet Temper Rolling Tension Control to Prevent Steel Sheet Jumping
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Solution Overview
Problem
Existing methods for preventing jumping in wet temper rolling, such as adjusting temper rolling liquid concentration and combining wet and dry temper rolling, are either ineffective in reliably preventing surface roughness changes or not applicable to single-stand rolling mills.
Innovation Solution
A method for setting tension in wet temper rolling based on the carbon content, sheet thickness, load, and surface roughness of the work rolls, using a specific formula to determine optimal tension ranges that prevent jumping and cross buckling, applicable to both single-stand and multi-stand rolling mills.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the concentration of temper rolling liquid is adjusted to prevent jumping, then the occurrence of jumping is reduced, but the surface roughness and appearance of the steel sheet change
Solution Approach 1:
The invention changes the parameter being adjusted from temper rolling liquid concentration to tension force applied to the steel sheet. By controlling tension within a specific range (5-15 kgf/mm²), the method prevents jumping while maintaining stable surface roughness, as tension directly affects elongation ratio without altering the liquid concentration that would otherwise change surface properties
2Reliability
If wet temper rolling and dry temper rolling are used in combination to prevent jumping, then jumping is prevented, but the method becomes inapplicable to single-stand rolling mills
Solution Approach 1:
The invention creates a universal solution by developing a tension-based control method that can be applied to any rolling mill configuration, whether single-stand or multi-stand. The method uses a unified tension range (5-15 kgf/mm²) that works across different rolling mill types, eliminating the need for configuration-specific processes
3Manufacturing precision
If tension is increased to control elongation ratio, then material properties are adjusted, but jumping occurs when tension is excessively high
Solution Approach 1:
The invention applies preliminary anti-action by establishing an upper limit for tension (15 kgf/mm²) before jumping can occur. By pre-defining this critical threshold and maintaining tension below it, the method prevents the harmful effect of jumping while still achieving the desired elongation ratio for material property adjustment
Data Source
Figure 1
AI summary
The present invention provides a method for performing temper rolling on a cold rolled steel sheet, the method being designed to prevent the occurrence of problems such as jumping; the method relates to wet temper rolling and addresses changes in a concentration of a temper rolling liquid and changes in a load, and the method is applicable to both a rolling mill with a single stand and a rolling mill with multiple stands. A method for performing temper rolling on a cold rolled steel sheet, the temper rolling including wet temper rolling, the cold rolled steel sheet being an annealed cold rolled steel sheet, the method including setting a tension T (kgf/mm2) per unit cross-sectional area of the steel sheet for the temper rolling, based on a carbon content C (mass%) of the cold rolled steel sheet.