Heated Strip Joint Rolling for Fracture-Resistant Silicon Steel
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Solution Overview
Problem
Current methods for cold-rolling silicon steel sheets with high Si content are unable to prevent fractures at the joint portion during the cold rolling process to an operationally acceptable level, leading to productivity losses and increased production costs.
Innovation Solution
A cold-rolled steel strip manufacturing facility and method that involves joining two steel strips, heating the joint portion to a specific temperature (35°C or higher for Si content below 3% and 50°C or higher for Si content of 2% or more) before cold rolling, to enhance the stability and reduce the likelihood of fractures at the joint portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If laser welding is used to join steel strips, then joint strength and workability are improved, but the probability of fracture at the joint portion during cold rolling increases
Solution Approach 1:
The invention changes the temperature parameter of the joint portion by introducing a heating device that heats the joint portion to a predetermined temperature range (100°C to 500°C) before cold rolling. This temperature change modifies the material properties of the joint portion, reducing its susceptibility to fracture during the cold rolling process while maintaining the strength benefits of laser welding.
2Stability of the object's composition
If conventional welding optimization methods are used, then joint stability is improved, but fracture prevention during cold rolling of high Si content steel sheets remains insufficient
Solution Approach 1:
The invention introduces a temperature parameter change by heating the joint portion to a predetermined temperature range (100°C to 500°C) before cold rolling. This temperature modification specifically addresses the fracture issue in high Si content steel sheets by altering the material properties of the joint portion, making it more resistant to fracture during cold rolling while maintaining joint stability.
3Productivity
If fracture at joint portion occurs, then productivity decreases due to stopping cold rolling line, but continuing without heating causes frequent fractures
Solution Approach 1:
The invention applies preliminary heating to the joint portion before the cold rolling process. By pre-heating the joint portion to a predetermined temperature range (100°C to 500°C), the material properties are modified in advance to prevent fracture during cold rolling, thereby maintaining continuous operation and high productivity without stopping the production line.
4Ease of manufacture
If fracture occurs at joint portion, then work rolls need to be replaced, increasing production costs, but without heating fractures occur frequently
Solution Approach 1:
The invention changes the temperature parameter of the joint portion by heating it to a predetermined range (100°C to 500°C) before cold rolling. This parameter change prevents fracture at the joint portion, eliminating the need for work roll replacement and reducing production costs associated with downtime and maintenance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution effectively suppresses the occurrence of fractures at the joint portion during cold rolling, allowing for stable cold-rolling of silicon steel sheets and reducing production costs and downtime.
Implementation Method 1
a heating device configured to heat a joint portion between the preceding steel strip and the following steel strip
Data Source
AI summary
A cold-rolled steel strip manufacturing facility includes: a joining device configured to join a trailing end of a preceding steel strip and a leading end of a following steel strip to form a joined steel strip; a looper configured to store the joined steel strip; a heating device configured to heat a joint portion between the preceding steel strip and the following steel strip over an entire width direction; and a cold rolling mill configured to cold-roll the joined steel strip for which the joint portion was heated by the heating device, wherein the heating device is switchable between an output state and a non-output state, and during a period in which the joint portion passes through the heating device, is switched to the output state.