Metal Case Bottom-Wall Weld Layout for Stable Placement
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Solution Overview
Problem
Existing metal case manufacturing methods face challenges in achieving high accuracy in deep drawing of low ductility metals like stainless steel and titanium, leading to poor welding workability and stability issues during placement.
Innovation Solution
A metal case design where the welding portion between the bottom part and the side wall is exposed on the lower surface, with a flange portion on the bottom part that guides the welding process, improving workability and preventing weld beads from interfering with placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the boundary part between the bottom part and the side wall part exists on the side peripheral surface, then the welding can be performed, but the welding device must largely move along the tubular side peripheral surface in a circumferential direction or rotate the side wall part and the bottom part, resulting in poor workability
Solution Approach 1:
The invention changes the location of the boundary part from the side peripheral surface to the bottom surface, effectively changing the dimensional position where welding occurs. This allows the welding device to operate in a more accessible position without requiring large circumferential movements or rotation of components, thereby improving welding workability while reducing operational complexity
2Ease of manufacture
If the boundary part between the bottom part and the side wall part exists on the bottom part, then the welding workability is improved, but the weld beads that occur in an irregular shape by welding are exposed on the bottom surface and bulged from the bottom part, so that placement stability of the case deteriorates
Solution Approach 1:
The invention segments the bottom part into two distinct functional zones: a welding area where the boundary part and weld beads are located, and a placement area with a flat bottom surface. This segmentation allows the irregular weld beads to be confined to a specific region that does not interfere with the placement stability, effectively resolving the contradiction between improved welding workability and maintained placement stability
Data Source
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AI summary
A metal case is provided that is satisfactory in welding workability and can be stably placed on a placing surface. A metal case 1 has a bottom part 10 composed of a metal plate, and a side wall part 20 composed of a metal plate that stands from an outer peripheral edge 11 of the bottom part 10. A boundary part 30 between the bottom part 10 and the side wall part 20 includes a welding portion 31 formed by welding the both parts together. The welding portion 31 is exposed on a surface 10a of the metal case 1 on a lower side Z1 in a standing direction of the side wall part 20. And, a lower end 12 that is a lower end part of the bottom part 10 in the standing direction of the side wall part 20 is located on the lower side Z1 in the standing direction than the welding portion 31 is.