HDD Base Corner Portions Protect Weld Beads
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Solution Overview
Problem
Hermetically sealed hard disk drives face damage to their weld beads during handling and installation, leading to gas leakage and contamination due to impact, which existing technologies have not adequately addressed.
Innovation Solution
The design includes a base with corner portions that are substantially flush with the cover and weld bead, providing protection by redirecting impact forces away from the weld bead, and optionally featuring slits to enhance structural integrity and access for welding, forming a monolithic construction to maintain hermetic sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the weld bead is positioned at the open end of the base to hermetically seal the cover, then the hermetic sealing is achieved, but the weld bead becomes vulnerable to impact damage during handling and installation
Solution Approach 1:
The patent introduces corner portions as intermediary protective elements positioned between the weld bead and the external environment. These corner portions absorb and redirect impact forces away from the weld bead, serving as a mediator that protects the critical sealing element from direct impact while maintaining the hermetic seal integrity
2Object-affected harmful factors
If corner portions are added to protect the weld bead from impact, then impact resistance is improved, but the device complexity increases
Solution Approach 1:
The patent merges the corner portions with the base structure to form a one-piece monolithic construction. This integration eliminates the need for separate protective components, reducing assembly steps and manufacturing complexity while maintaining the protective function against impact
3Object-affected harmful factors
If the corner portions are made flush with the cover to redirect impact forces, then impact protection is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates the corner portions during the base formation process itself, before the welding operation. This preliminary integration allows the corner portions to be precisely positioned relative to the base geometry, and subsequent welding fixtures can accommodate this predetermined structure, reducing the actual precision demands during final assembly
4Ease of manufacture
If slits are added between the weld bead and corner portions to improve structural integrity, then manufacturing flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent introduces slits as segmented features in the base structure that create controlled gaps between the corner portions and the weld bead area. This segmentation provides necessary clearance for welding operations and improves structural integrity by creating stress relief zones, while the slits themselves are simple geometric features that minimize added complexity
Data Source
AI summary
Described herein is a hard disk drive that includes a base and a cover. The base includes a closed end, sidewalls, an open end, and one or more corner portions. The sidewalls extend from the closed end, and the open end is defined by the sidewalls. The closed end, sidewalls, and open end define an interior cavity of the hard disk drive. Each corner portion is proximate a respective intersection of the sidewalls and positioned exteriorly of the interior cavity. The cover is welded to the sidewalls over the open end by a weld bead such that the weld bead is positioned between the interior cavity and the corner portions. The weld bead hermetically seals the cover to the base. Furthermore, at least one of the corner portions is at least substantially flush with the cover.