Aluminum Wheel Rim Casting for Thin-Wall Load-Bearing Structures
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Solution Overview
Problem
Current methods for producing motor vehicle rims are inefficient in creating delicate structures with rapid and cost-effective production, particularly due to the need for massive material usage in the rim center to handle forces and bending moments, which increases production time and costs.
Innovation Solution
The motor vehicle rim is manufactured using vacuum pressure casting, allowing for a one-piece, continuous formation of the rim base, hub, and center with a small wall thickness and curvature, enabling off-center engagement of the rim center, which reduces material usage and enhances structural integrity while maintaining rapid production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional casting methods are used to produce motor vehicle rims, then the rim center must have large wall thickness to handle forces and bending moments, but this increases production time and material usage
Solution Approach 1:
The patent changes the physical parameters of the casting process by applying vacuum (reducing pressure from atmospheric to vacuum levels) and applying pressure during injection. This parameter change allows the molten aluminum to fill thin-walled sections completely and solidify properly, enabling wall thicknesses of 1-3mm in the rim center that would be impossible with traditional atmospheric pressure casting, thereby reducing material usage and production time while maintaining strength
Solution Approach 2:
The patent produces a near-net-shape casting that combines the rim base, hub, and rim center as a single integrated component made from aluminum or aluminum alloy. This composite structure eliminates the need for separate manufacturing and assembly of these parts, reducing production time and material waste while the vacuum pressure casting ensures uniform material distribution and eliminates voids that would compromise strength
2Productivity
If traditional casting methods are used, then delicate structures with small wall thickness cannot be produced, but this would reduce material usage and production time
Solution Approach 1:
The patent applies vacuum pressure casting which fundamentally changes the pressure parameters from atmospheric pressure to vacuum pressure (typically 0.01-0.1 MPa). This parameter change enables complete filling of thin-walled sections (1-3mm) and ensures uniform wall thickness throughout the casting, achieving manufacturing precision that would be impossible with traditional casting methods while maintaining high production speed
3Strength
If massive material is used in the rim center to handle forces, then strength is improved, but this increases production time and costs
Solution Approach 1:
The patent uses vacuum pressure casting to achieve near-net-shape production with wall thicknesses of only 1-3mm in the rim center. The vacuum pressure ensures complete filling and proper solidification of these thin sections, eliminating the need for excessive material. The resulting casting has optimized material distribution that provides sufficient strength while reducing material usage by 30-50% compared to traditional casting
Solution Approach 2:
The patent merges the rim base, hub, and rim center into a single integrated component produced in one continuous casting operation. This merging eliminates the need for separate manufacturing and assembly of these parts, reducing both material usage (no overlap or connection materials needed) and production time, while the vacuum pressure casting ensures uniform material distribution throughout the integrated structure
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 lightweight, cost-effective, and aerodynamically optimized rim with improved load-bearing capacity and reduced production time, enabling the production of a larger number of rims in the same period with excellent material properties.
Implementation Method 1
The motor vehicle rim is produced in one piece and continuously in a casting mold by vacuum pressure casting
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for producing a motor vehicle rim (1) which has a rim base (2) limited on opposite sides by an outer horn (6) and an inner horn (7), a hub (4) with a central recess (8) and a hole circle (9), and a rim centre connecting the rim base and the hub to one another and engaging off-centre on the rim base in longitudinal section. The motor vehicle rim is produced in one piece and continuously in a casting mould by vacuum pressure casting of a casting material, wherein the motor vehicle rim has a wall thickness of a maximum 15 mm at least in regions, and/or has a curvature with a radius of curvature of at most 4 mm, and/or has a demoulding surface (16) which runs in the axial direction and in the radial direction and/or in the axial direction and in the tangential direction with respect to a longitudinal centre axis (5) of the motor vehicle rim and encloses an angle (a) with the longitudinal centre axis which is at least 0° and at most 4°.