H-Shaped Steel Rolling with Deep Splits for Wider Flanges
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Solution Overview
Problem
Existing methods for producing large-size H-shaped steel products face challenges in broadening flange width due to limitations in rough rolling techniques, leading to issues like elongation and deformation, and fail to efficiently produce H-shaped steel with widened flanges.
Innovation Solution
A method involving a rough rolling step with calibers configured to create deep splits on the end surfaces of a rectangular cross-section raw material using projections with acute-angle tips, followed by sequential bending of flange parts, and a flat rolling step with recessed parts to prevent shape defects, allowing for stable production of H-shaped steel with a larger flange width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional rough rolling techniques are used to produce large-size H-shaped steel, then production efficiency is maintained, but flange width cannot be effectively broadened and shape defects occur
Solution Approach 1:
The patent applies preliminary action by creating deep splits on the end surfaces of the raw material before the main rolling process. Projections in the calibers form these splits in advance, allowing the flange parts to be properly shaped and broadened during subsequent rolling operations, thereby achieving both precision and efficiency
Solution Approach 2:
The patent segments the rolling process into distinct stages: creating deep splits in the first caliber, widening and bending flange parts in second and subsequent calibers, and eliminating splits in later calibers. This segmentation allows each stage to focus on a specific task, improving both flange width precision and overall production efficiency
2Length of moving object
If flat shaping and rolling is performed to reduce web corresponding part, then web height is reduced, but elongation occurs in web and flange corresponding parts
Solution Approach 1:
The patent performs preliminary shaping of the flange parts by creating deep splits and bending them outward before the web reduction process. This preliminary action prepares the material flow patterns, allowing subsequent web reduction to occur without causing unwanted elongation in the web and flange corresponding parts
Solution Approach 2:
The patent applies local quality by creating deep splits specifically at the end surfaces of the raw material, concentrating the shaping action where it is most needed. This localized approach allows the flange parts to be properly formed without affecting the overall dimensions of the web, preventing elongation issues
Data Source
AI summary
A method for producing H-shaped steel, the method includes: a rough rolling step; an intermediate rolling step; and a finish rolling step, wherein: the rough rolling step includes: an edging rolling step of rolling and shaping a material to be rolled into a predetermined almost dog-bone shape; and a flat rolling step of performing rolling of a web part with the material to be rolled after completion of the edging rolling step rotated 90° or 270°; upper and lower caliber rolls of at least one caliber of calibers configured to perform the flat rolling step include recessed parts configured to form a raised part at a middle of a web part of the material to be rolled, the recessed parts being provided at roll barrel length middle parts of the upper and lower caliber rolls; and a side surface inclination angle α of the formed raised part is set to 30° or more.