Aluminum 6061 T651 Rackmount Chassis for Weight and EMI Reduction
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Solution Overview
Problem
Traditional steel rackmount chassis suffer from corrosion, whisker formation, high weight, and high magnetic permeability, which can lead to short circuits and interference with sensitive electronic equipment.
Innovation Solution
A rackmount chassis made from aluminum 6061 T651 sheet metal, with a three-dimensional base piece and cover piece configuration, providing structural strength, low weight, and low magnetic permeability, and resistance to whisker formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel is used for rackmount chassis, then structural strength is improved, but weight increases and magnetic permeability increases
Solution Approach 1:
The patent changes the material parameter from steel to aluminum alloy 6061-T6, which has different mechanical properties including lower density (2.7 g/cm³ vs 7.8 g/cm³ for steel) but sufficient strength through heat treatment and alloying elements (Mg, Si, Mn) to maintain structural integrity while reducing weight by approximately 65%
Solution Approach 2:
The patent uses aluminum alloy 6061-T6, which is a composite material containing aluminum base metal with added elements (Mg: 0.8-1.8%, Si: 0.4-1.0%, Mn: 0.15-0.4%) that work together to achieve both reduced weight and maintained structural strength through synergistic material properties
2Reliability
If steel with zinc coating is used for rackmount chassis, then corrosion resistance is improved, but whisker formation occurs
Solution Approach 1:
The patent removes the zinc coating layer from the chassis material, using bare aluminum alloy 6061-T6 instead. This eliminates the source of whisker formation while maintaining corrosion resistance through the aluminum oxide layer that naturally forms on aluminum surfaces, preventing both the harmful zinc whiskers and the need for additional protective coatings
3Strength
If steel is used for rackmount chassis, then structural strength is improved, but magnetic field permeability increases causing electromagnetic interference
Solution Approach 1:
The patent changes the magnetic property parameter by selecting aluminum alloy 6061-T6, which has magnetic permeability approximately 1.000004 times that of free space, compared to steel which can be 100-10000 times more permeable. This parameter change eliminates the chassis's ability to concentrate or guide magnetic fields, preventing electromagnetic interference while structural strength is maintained through the alloy's mechanical properties
Data Source
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AI summary
A rectilinear rackmount chassis (10) comprises a three-dimensional base piece (3) fabricated from a single piece of sheet metal which is made of aluminum 6061 T651, and a cover piece (9) fitted over, and mating with, the base piece (3) which, in one embodiment, is also made of aluminum 6061 T651.