Aluminum Stamper Base Material Grain Refinement
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Solution Overview
Problem
Highly pure aluminum used in stamper manufacturing tends to develop coarse crystal grains during casting and deformation processing, leading to surface irregularities and increased costs due to the need for complex processing and high refiner additions, which impair the quality of the alumite surface and increase production costs.
Innovation Solution
An aluminum base die material with 0.5% to 3.0% Mg by weight, limited to 500 ppm or less of elements other than Mg, including unavoidable impurities, is forged to achieve an average crystal grain size of 1000 μm or less and a surface area ratio of second phase particles of 0.10% or less, allowing for uniform relief patterns and reduced deformation processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If highly pure aluminum is used as stamper material, then second phase particles are reduced and treated film defects are inhibited, but crystal grains become coarse during casting and deformation processing, leading to surface irregularities
Solution Approach 1:
The invention changes the chemical composition parameters of the aluminum material by adding specific amounts of Mg (0.01-3.0 wt%), Si (0.01-0.5 wt%), and other elements in controlled quantities. This parameter change prevents excessive crystal grain growth during casting and deformation while maintaining low second phase particle content, thereby resolving the contradiction between surface quality and crystal grain size control
Solution Approach 2:
The invention creates a composite aluminum material system by combining aluminum with small controlled amounts of Mg, Si, and other elements. This composite approach allows the material to benefit from both the purity of aluminum (low second phase particles) and the grain-refining effects of the added elements, resolving the contradiction between reducing defects and controlling crystal grain size
2Shape
If complex deformation processing is applied to refine crystal grains, then surface irregularities are reduced, but production costs increase due to multiple processing steps and high refiner additions
Solution Approach 1:
The invention performs preliminary grain refinement during the casting stage by adding specific elements (Mg, Si, etc.) to the aluminum melt. This preliminary action creates a fine-grained structure that requires minimal subsequent deformation processing, thereby reducing production costs while achieving the desired crystal grain uniformity
Solution Approach 2:
By changing the chemical composition parameters (adding Mg, Si, and other elements in specific amounts), the invention alters the solidification behavior and recrystallization characteristics of aluminum, enabling natural grain refinement during casting and reducing the need for complex post-processing operations, thus lowering manufacturing costs
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 results in a stamper with fine, uniformly oriented crystal grains and high hardness, enabling a smooth surface finish and cost-effective production of a precise stamper with a uniform relief pattern free of directivity.
Implementation Method 1
fabricating a casting (stamper) in which a relief structure is formed in which anodic oxidation treatment (to also be referred to as 'alumite treatment') has been carried out on an aluminum surface
Implementation Method 2
An aluminum base die material for a stamper having a component composition that contains 0.5% by weight to 3.0% by weight of Mg... and a forged structure in which the average crystal grain size is 1000 μm or less
Data Source
AI summary
The present invention relates to an aluminum die base material for a stamper having a component composition that contains 0.5% by weight to 3.0% by weight of Mg, the total amount of elements other than Mg, including unavoidable impurities, is 500 ppm or less, and the remainder is composed of Al, and a forged structure in which the average crystal grain size is 1000 μm or less and the surface area ratio of second phase particles is 0.10% or less. According to the present application, a stamper can be provided in which, together with the crystal grain size of the aluminum being refined, the formation of second phase particles is inhibited, surface irregularities attributable to mirrored surface polishing are reduced, and a uniform relief pattern is formed by anodic oxidation treatment.