Hard Disk Drive Mounting Arm Striations for Residual Stress Control
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Solution Overview
Problem
Existing mounting arms for hard disk drives face challenges in achieving desirable shape characteristics and minimizing residual stress, leading to inefficiencies in manufacturing due to frequent tooling changes and limited success with conventional fabrication methods.
Innovation Solution
The introduction of striations on the mounting arm, formed using a serrated punch, to create localized compressive stress zones, allowing for adjustable shape manipulation and improved residual stress conditions, which can be aligned, spaced, and oriented to achieve specific structural characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fabrication methods are used to manufacture mounting arms, then the manufacturing process is simple, but the residual stress in the mounting arm cannot be effectively controlled and shape characteristics are undesirable
Solution Approach 1:
The patent applies preliminary action by pre-forming compression zones on the mounting arm before final assembly. The serrated punch creates localized compressive stress zones in advance, which then counteract residual stresses during operation, eliminating the need for complex post-production adjustments and reducing tooling changes.
Solution Approach 2:
The patent implements local quality by introducing striations at specific locations on the mounting arm to create localized compressive stress zones. These zones are strategically positioned to counteract residual stresses in particular areas, allowing different parts of the mounting arm to have different stress characteristics optimized for their specific functions.
2Strength
If the mounting arm is made stiffer to withstand mechanical shocks, then the structural integrity is improved, but the ability to adjust shape characteristics is reduced
Solution Approach 1:
The patent applies local quality by creating localized compressive stress zones through striations at specific locations on the mounting arm. This allows the mounting arm to maintain overall structural integrity while having localized regions that can adjust shape characteristics to compensate for residual stresses, effectively combining stiffness with adaptability.
3Manufacturing precision
If frequent tooling changes are made to achieve desired shape characteristics, then the manufacturing precision is improved, but the productivity decreases
Solution Approach 1:
The patent applies preliminary action by pre-forming the compression zones using a serrated punch during the initial stamping process. This preliminary formation of stress counteracting features eliminates the need for frequent tooling changes during subsequent manufacturing stages, thereby maintaining manufacturing precision while improving productivity by reducing tooling change frequency.
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 enables the mounting arm to maintain structural integrity and stiffness while allowing for precise shape adjustment, reducing the need for frequent tooling changes and improving the arm's ability to withstand mechanical shocks and vibrations.
Implementation Method 1
The striations may be formed by applying a serrated punch to the mounting arm
Data Source
AI summary
A mounting arm for a hard disk drive having a generally planar region, the mounting arm having at least one striation formed on the generally planar region to provide compressive residual stress with desirable shape characteristics in the mounting arm.