Shape-Correcting Quenching Rolls for Warpage Control in Steel Sheet
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Solution Overview
Problem
Existing quenching methods for high tensile steel sheets face challenges in preventing warpage and deformation during the quenching process, particularly when the metal sheet is already warped, and applying excessive tension can lead to rupture or further deformation.
Innovation Solution
A quenching apparatus that includes a cooling device, shape correction rolls on either side of the metal sheet, and a pressing control device that adjusts the pressing quantity of the rolls based on the pre-quenching shape of the metal sheet to correct warpage before quenching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If water quenching method is used to achieve fastest cooling rate, then cooling speed is improved, but shape defects such as warpage or wavelike deformation occur
Solution Approach 1:
The patent applies preliminary action by using bridle rolls to pre-correct the shape of the metal sheet before quenching. The bridle rolls adjust the shape in advance to prevent warpage and wavelike deformation from occurring during the rapid water quenching process, allowing the fastest cooling rate to be achieved without shape defects
2Shape
If bridle rolls are used to suppress wavelike deformation, then shape control is improved, but rupture may occur due to large tension on high-temperature metal sheet
Solution Approach 1:
The patent applies parameter changes by controlling the tension and pressing force parameters of the bridle rolls to appropriate levels. By adjusting these parameters, the system achieves effective shape control during quenching while preventing excessive tension that would cause rupture of the high-temperature metal sheet
3Shape
If bridle roll is provided at front of quenching part to change tension, then shape correction is attempted, but thermal crown causes nonuniform contact and buckling
Solution Approach 1:
The patent applies parameter changes by adjusting the position and pressing force parameters of the bridle rolls to compensate for thermal crown effects. This ensures uniform contact between the bridle rolls and the metal sheet during quenching, preventing buckling and maintaining manufacturing precision
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 solution effectively suppresses warpage in the metal sheet after quenching, even when the sheet is initially warped, by accurately correcting the shape before cooling, thereby improving the uniformity and reducing deformation in high-strength steel sheets.
Implementation Method 1
a cooling device that performs quenching by cooling the metal sheet with a cooling fluid
Implementation Method 2
shape correction rolls that are provided beside a front surface and a back surface of the metal sheet and press, in a thickness direction of the metal sheet, the metal sheet before being quenched
Data Source
AI summary
A quenching apparatus that is configured to cool a metal sheet, the quenching apparatus including: a cooling device that is configured to perform quenching by cooling the metal sheet with a cooling fluid; a plurality of shape correction rolls that includes at least a front shape correction roll and a back shape correction roll that are configured to be respectively provided at a front surface and a back surface of the metal sheet and press, in a thickness direction of the metal sheet, the metal sheet before being quenched; and a pressing processor that is configured to set, based on a shape of the metal sheet before quenching, a pressing quantity of each shape correction roll of the plurality of shape correction rolls.