Semi-solid die casting with 30 μm crystals for sub-0.6 mm products
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Solution Overview
Problem
Conventional die casting techniques, including semi-solid die casting, face limitations in producing products with thicknesses less than 0.6 mm due to restrictions in micronizing primary crystal size and achieving stable granulation, leading to variations in grain size and oxidation issues.
Innovation Solution
A die casting method that forms semi-solid metallic material with particles of 30 μm or less, allowing for the production of products with thicknesses of 0.5 mm or less by altering flow behavior to that of a viscous fluid, enabling complete filling and maintaining particle size consistency in the final product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional die casting techniques are used, then manufacturing capability is maintained, but product thickness is limited to 0.6 mm or more
Solution Approach 1:
The patent changes the fundamental parameter of material state from liquid to semi-solid, and controls particle size of primary crystals to 30 μm or less. This parameter change enables the material to flow into thin sections (0.5 mm or less) while maintaining fillability and eliminating the conventional thickness limitation of 0.6 mm
Solution Approach 2:
The patent utilizes phase transition by forming semi-solid metallic material with a specific solid-liquid mixture state. The material is prepared with primary crystals in solid phase dispersed in liquid phase, and this phase transition state enables both flowability for thin section filling and structural integrity for dimensional accuracy
2Manufacturing precision
If primary crystal size is reduced to enable thin product production, then product thickness can be decreased, but grain size variation and oxidation issues occur
Solution Approach 1:
The patent establishes a specific parameter threshold for primary crystal size (30 μm or less) that optimizes the balance between flowability and oxidation resistance. This controlled particle size parameter ensures uniform grain structure in the final product while enabling production of thicknesses of 0.5 mm or less
Solution Approach 2:
The patent employs a disposable cup for forming the semi-solid slurry, eliminating the need for expensive and complex slurry preparation equipment. The cup is used once to form the slurry with consistent particle size, then discarded, avoiding oxidation issues associated with prolonged equipment exposure and enabling repeatable production of thin sections
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 method allows for the production of diecast products with thicknesses as low as 0.5 mm or less, achieving higher dimensional accuracy and ensuring consistent metallographic structures with fine particle sizes, while reducing oxidation and gas entrapment.
Implementation Method 1
increase the number of occurrences of nucleation
Implementation Method 2
after crystallization of a given amount of solid phase, the slurry in solid and liquid coexisting state is put into an injection sleeve
Implementation Method 3
the semi-solidified slurry is injected or molded into a die
Data Source
AI summary
A die casting method and apparatus are provided, thereby making it possible to produce a thin diecast product that has hitherto been considered impossible to realize, and a diecast product is also provided. A semi-solidified metallic material is formed having particles in solid phase of a particle size less than 30 μm, and is thereupon injected into a die. A die casting machine has a sleeve into which a melt of metallic material is poured, and the semi-solidifying material there when it has a certain proportion of solid phase reached is injected into the die with a plunger to which pressure is applied. The melt of metallic material is poured into the sleeve so that the material occupies inside the sleeve at a proportion in vertical cross-sectional area of 30% or less. The particle size in this semi-solid material is held unvaried in a product as diecast.