Springback Reduction in Press-Formed Metal Parts
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Solution Overview
Problem
Existing methods for reducing springback in high-strength steel sheets during press forming are limited to specific shapes, such as hat-shaped cross sections, restricting the range of parts that can be manufactured effectively.
Innovation Solution
A method that involves setting elements of an analytic model to stressed states causing springback, performing optimization analysis to detect rigidity-contributable portions, and applying rigidity-improving means to specific portions of the press-formed part, allowing for springback reduction in parts of any shape during press forming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If high-strength steel sheets are used to reduce weight, then weight reduction is achieved, but springback increases during forming
Solution Approach 1:
The patent applies preliminary action by performing a compressive force on the vertical wall portion of the metal sheet immediately after the bending step, before the springback can fully occur. This preliminary compression counteracts the upcoming springback deformation, allowing high-strength steel sheets to be formed with reduced springback while maintaining weight reduction benefits
2Manufacturing precision
If a die for press forming with bending step and vertical-wall-portion compressing step is used, then springback is reduced, but the range of manufacturable part shapes is limited
Solution Approach 1:
The patent applies local quality by selectively applying the compressive force only to the vertical wall portion of the metal sheet, rather than uniformly treating the entire part. This localized approach allows the method to be adapted to various part geometries, as only the specific regions requiring springback control are compressed, thereby expanding the range of manufacturable shapes while maintaining springback reduction
Data Source
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Figure 3(a)~3(b)
AI summary
A springback-reduced part formed by performing a springback reduction on a press-formed part that is formed by a press forming of a blank sheet made of a metal sheet. The springback-reduced part is formed by setting each element of an analytic model of the press-formed part to a stressed state that causes a springback, performing an optimization analysis for shape to detect a portion of the press-formed part that highly contributes to the rigidity thereof, applying a rigidity improving means on a specific portion of the press-formed part on the basis of the detected portion, and performing the press forming.