Patchwork Blank Bending Sequence for Thickened Joint Integrity
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Solution Overview
Problem
The existing press molding techniques for manufacturing automobile framework members with thickened portions often result in unintended cracking or bending at the joint portions due to concentrated bending stress.
Innovation Solution
A method involving separate bending steps and mechanisms for thickened and non-thickened portions of a patchwork blank, using a press molding apparatus with distinct mechanisms to apply vertical and inclined press loads, allowing for accurate bending and stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a patchwork blank with thickened portion is press-molded using conventional single-step bending, then the thickened portion can be formed to enhance strength, but bending stress concentrates on the joint portion causing unintended cracking or bending
Solution Approach 1:
The bending process is segmented into two distinct steps: first bending the thickened portion, then bending the non-thickened portion in a different step. This segmentation prevents stress concentration at the joint portion by separating the bending actions, thereby maintaining both the strength-enhancing thickened portion and the integrity of the joint connection.
2Reliability
If separate bending steps are used for thickened and non-thickened portions, then stress concentration is prevented and joint integrity is maintained, but manufacturing process complexity increases
Solution Approach 1:
The bending process is divided into sequential steps with dedicated bending mechanisms for each portion. The first bending mechanism bends the thickened portion, followed by the second bending mechanism for the non-thickened portion. This segmentation, while increasing process steps, ensures reliable joint integrity by preventing stress concentration.
3Productivity
If conventional press molding is used on patchwork blanks, then production efficiency is maintained, but manufacturing precision of bent portions deteriorates due to stress concentration and unintended deformation
Solution Approach 1:
The bending operation is segmented into two sequential steps with specialized mechanisms: the first bending mechanism for the thickened portion and the second bending mechanism for the non-thickened portion. This segmentation achieves precise bending of each portion independently, preventing unintended deformation while maintaining production efficiency through automated sequential processing.
4Device complexity
If a single bending mechanism is used for the entire patchwork blank, then device complexity is reduced, but bending precision of individual portions deteriorates
Solution Approach 1:
The bending system is segmented into two independent mechanisms: the first bending mechanism dedicated to bending the thickened portion, and the second bending mechanism dedicated to bending the non-thickened portion. This segmentation enables each mechanism to be optimized for its specific task, achieving high bending precision for both portions while maintaining reasonable device complexity through modular design.
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
This approach prevents unintended cracking or bending at the joint portions, enabling accurate shaping of press-molded articles like automobile B-pillars with enhanced strength and accuracy.
Implementation Method 1
The first mechanism may be driven in a vertical direction to apply a press load in a vertical direction to the thickened portion
Implementation Method 2
The second mechanism may include a cam mechanism that converts a press load in a vertical direction of the first mechanism from a vertical direction to an inclined direction
Data Source
AI summary
A method for manufacturing a press-molded article includes: preparing a patchwork blank in which a thickened portion is formed by welding patchwork to basework; bending only the thickened portion of the patchwork blank; and bending a portion other than the thickened portion in a step different from bending of the thickened portion.