Welded Metal Case Structure for Stable Bottom Placement
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Solution Overview
Problem
Existing metal case manufacturing methods face challenges with poor welding workability and stability due to irregular weld beads bulging from the bottom surface, causing placement issues when using configurations that avoid deep drawing processes.
Innovation Solution
A metal case design featuring a bottom part with a lower end positioned below the welding portion, allowing the welding beads to be exposed on the side and preventing them from contacting the placement surface, combined with a flange portion for improved welding guidance and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the boundary part between the bottom part and the side wall part is positioned on the side peripheral surface, then welding workability is improved, but the welding device must largely move along the tubular side peripheral surface or rotate the parts, resulting in poor operational efficiency
Solution Approach 1:
The invention changes the position of the boundary part from the side peripheral surface to the bottom surface, effectively moving the welding operation from a vertical/circumferential path to a horizontal/path along the bottom surface. This dimensional change allows the welding device to move in a more efficient direction, improving both welding workability and operational efficiency simultaneously
2Ease of manufacture
If the boundary part between the bottom part and the side wall part is positioned on the bottom part, then welding workability is improved, but weld beads bulge from the bottom surface, causing poor placement stability
Solution Approach 1:
The invention applies local quality by creating a recessed portion in the bottom surface that is specifically designed to contain the weld beads. This localized structural modification allows the weld beads to be positioned in a controlled manner within the recess, preventing them from bulging outward and interfering with placement stability, while still maintaining the welding workability benefits of having the boundary part on the bottom surface
3Manufacturing precision
If deep drawing process is used to manufacture the case, then manufacturing precision can be maintained, but the process is limited in draw depth and causes cracks beyond the limit
Solution Approach 1:
The invention segments the case into two separate components: a bottom part and a side wall part. These segments are manufactured separately using processes suitable for each component's requirements, then joined together through welding. This segmentation allows the bottom part to be formed with high precision using deep drawing or other processes, while the side wall part can be manufactured to achieve greater depths without the limitations and crack risks associated with deep drawing the entire case as a single piece
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
Enhances welding workability and ensures stable placement by preventing weld beads from interfering with the surface, improving the overall manufacturing process and product stability.
Implementation Method 1
a boundary part between the bottom part and the side wall part includes a welding portion formed by welding the both parts together
Data Source
AI summary
A metal case has a bottom part composed of a metal plate, and a side wall part composed of a metal plate that stands from an outer peripheral edge of the bottom part. A boundary part between the bottom part and the side wall part includes a welding portion formed by welding the both parts together. The welding portion is exposed on a surface of the metal case on a lower side in a standing direction of the side wall part. And, a lower end that is a lower end part of the bottom part in the standing direction of the side wall part is located on the lower side in the standing direction than the welding portion is.