Vehicle Subframe Radial Rib Guide for Molten Metal Flow
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Solution Overview
Problem
The existing subframe casting process using aluminum alloy faces difficulties in smoothly guiding molten metal due to the saw-toothed shape of reinforcing ribs, leading to poor flow and casting challenges.
Innovation Solution
A vehicle subframe design featuring a cross member with radial and parallel ribs, where radial ribs tilt outward and parallel ribs intersect, forming guide passages in the mold to facilitate smooth metal flow, and the rib heights are optimized to ensure effective molten metal distribution across the cast member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing ribs are formed in a saw-toothed shape to increase strength and rigidity, then the structural strength is improved, but the molten metal flow becomes difficult to guide smoothly
Solution Approach 1:
The patent applies different rib configurations to different regions of the subframe. The radial ribs extend outward from the central part with increasing tilt angles toward the front, while parallel ribs extend in the longitudinal direction. This local differentiation allows the mold cavities to guide molten metal smoothly while still providing reinforcement where needed.
Solution Approach 2:
The radial ribs are designed with curved surfaces rather than sharp angular transitions. The ribs extend radially outward with smooth curvature, allowing molten metal to flow along the curved cavity surfaces without abrupt directional changes, thereby maintaining good flow while providing structural reinforcement.
2Strength
If complex rib structures are added to the cross member to enhance rigidity, then the subframe rigidity is improved, but the mold cavity design becomes more complex
Solution Approach 1:
The mold cavities serve dual functions: they form the reinforcing ribs on the subframe and simultaneously guide the molten metal flow. The cavity shapes are designed to perform both structural formation and flow guidance, eliminating the need for separate flow guidance features and simplifying the overall mold design.
Solution Approach 2:
The rib structure is segmented into distinct radial ribs and parallel ribs with different orientations and functions. The radial ribs provide outward reinforcement while the parallel ribs provide longitudinal reinforcement, allowing the mold cavities to be designed as separate, simpler segments rather than one complex integrated cavity.
Data Source
AI summary
Disclosed is a subframe for a vehicle that allows a molten metal to be smoothly guided in order to maintain a good flow. This subframe for a vehicle is equipped with a rear subframe. For the rear subframe, a rear cross member, a rear section of a left side member, and a rear upper section of a right side member are constructed with an aluminum alloy and formed into one piece that has a substantially U-shape in a plan view. The rear cross member has a radial rib group that extends radially and a parallel rib group that intersects with the radial rib group. The radial rib group is configured such that radial ribs positioned further outside in the vehicle width direction form larger tilt angles.