Die Cast Vehicle Structural Body with Localized Metal Properties
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Solution Overview
Problem
Structural bodies integrally molded by die casting typically have uniform metal properties, limiting the ability to provide different functions based on varying metal properties in different portions.
Innovation Solution
A structural body is designed with distinct metal properties in different portions, where one portion has lower strength and higher ductility than another, allowing for improved energy absorption and rigidity distribution, enhancing maneuverability and integrating crash boxes with other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a structural body is integrally molded by die casting with uniform metal properties, then manufacturing simplicity is maintained, but the ability to provide different functions in different portions is limited
Solution Approach 1:
The patent applies local quality by creating different metal properties in different portions of the integrally molded structural body. Specifically, the first portion (inner side) has higher strength and lower ductility, while the second portion (outer side) has lower strength and higher ductility. This allows each portion to be optimized for its specific function: the inner portion for rigidity and strength, and the outer portion for energy absorption through deformation.
Solution Approach 2:
The patent changes metal property parameters (strength and ductility) across different portions of the structural body. By controlling cooling rates during die casting, the inner portion cools slower to achieve higher strength, while the outer portion cools faster to achieve higher ductility. This parameter variation enables multiple functions within a single integrally molded component.
2Loss of energy
If the outer portion has higher ductility for energy absorption, then energy absorption performance is improved, but overall structural strength may be reduced
Solution Approach 1:
The patent resolves this contradiction by applying local quality - the outer portion (second portion) is designed with higher ductility specifically for energy absorption during collisions, while the inner portion (first portion) maintains higher strength for structural integrity. Each portion's metal properties are locally optimized for its specific functional requirement.
Solution Approach 2:
The structural body is segmented into two portions with different metal properties. The first portion (inner side) and second portion (outer side) are functionally segmented, with the inner portion providing strength and the outer portion providing energy absorption capability through controlled differences in strength and ductility parameters.
3Ease of operation
If the inner portion has higher strength for rigidity, then maneuverability is improved, but energy absorption capability may be reduced
Solution Approach 1:
The patent applies local quality by giving the inner portion (first portion) higher strength and lower ductility for rigidity and maneuverability, while the outer portion (second portion) has lower strength and higher ductility for energy absorption. The local optimization of metal properties in each portion resolves the contradiction between rigidity and energy absorption capability.
Data Source
AI summary
A structural body, which is integrally molded by die casting and which is configured to form a vehicle skeleton, the structural body including a portion at one end side and a portion at another end side that respectively have different metal properties.