Metal Injection Molded Base for Data Storage Systems
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Solution Overview
Problem
Stamped steel bases for small form factor disc drives face challenges in achieving thickness variations, small corner radii, and sealing issues due to through holes, leading to leakage and corrosion problems, while aluminum die casting offers low stiffness and inadequate magnetic properties.
Innovation Solution
A metal injection molded base with integral three-dimensional features, such as a motor housing, formed simultaneously with the platform using a mixture of metal powder and polymer binding material, eliminating the need for through holes and allowing for high stiffness and magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If stamped steel base is used, then cost effectiveness and high strength are achieved, but thickness variation and small corner radiuses cannot be achieved
Solution Approach 1:
The patent transitions from stamped steel to metal injection molded (MIM) base, changing the manufacturing process parameters to achieve both cost effectiveness and manufacturing precision. MIM allows complex three-dimensional features, thickness variations, and small corner radiuses to be formed directly during molding, eliminating the need for additional machining operations while maintaining cost efficiency.
Solution Approach 2:
The patent employs metal injection molding technology that combines metal powders with binding agents to create a composite material system. This allows the base to achieve high strength and magnetic properties equivalent to stamped steel while enabling complex geometries and precise dimensional control that stamped steel cannot provide.
2Manufacturing precision
If through holes are added to stamped base, then thickness variation is achieved, but sealing costs and leakage problems increase
Solution Approach 1:
The patent merges the thickness variation features directly into the base structure through MIM molding, eliminating the need for separate through holes. The complex three-dimensional features are formed integrally with the base platform during the molding process, creating a seamless structure that prevents leakage without requiring additional sealing operations.
Solution Approach 2:
The patent extracts the problematic through holes from the design by forming all thickness variations and three-dimensional features as integral parts of the base structure. This eliminates the need for holes that would require sealing, thereby removing the source of leakage problems while maintaining the required thickness variations.
3Adaptability or versatility
If force fit components are added to stamped base, then application needs are met, but thread formation difficulty and corrosion issues occur
Solution Approach 1:
The patent merges the force fit components and mounting features directly into the base structure through MIM molding. Threads and mounting features are formed integrally with the base platform, eliminating separate force fit components. This integral construction prevents corrosion at interfaces and ensures high-quality thread formation without the defects associated with post-stamping thread creation.
4Ease of manufacture
If aluminum die casting is used, then manufacturing ease is improved, but stiffness and magnetic properties are insufficient
Solution Approach 1:
The patent uses metal injection molding with magnetic metal powders to create a base that maintains the manufacturing ease of aluminum die casting while achieving the stiffness and magnetic properties of steel. The MIM process allows control of material composition and density to optimize both mechanical strength and magnetic characteristics.
Solution Approach 2:
The patent changes the material parameters from aluminum alloy to magnetic metal powder compositions, while maintaining the injection molding process advantages. By adjusting the metal powder type, binding agent, and sintering parameters, the base achieves both ease of manufacture and superior magnetic properties with high stiffness.
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
The metal injection molded base provides a rigid, cost-effective solution with improved sealing, reduced leakage, and enhanced magnetic properties, enabling better performance and reliability in small form factor disc drives.
Implementation Method 1
The mold is heated in an oven for de-bonding and the mold is heated in an oven for sintering
Data Source
AI summary
The present invention provides a data storage system. The data storage system includes a metal injected molded base. The metal injection molded base includes a metal injection molded platform and at least one metal injection molded three-dimensional feature. The at least one metal injection molded three-dimensional feature is formed integrally and simultaneously with the metal injection molded platform. The at least one three-dimensional feature configured to mount data storage system components to the platform.