Aluminum Wheel Rim Die Casting With Post-Compaction
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Solution Overview
Problem
Current methods for producing automobile rims from aluminum or aluminum alloys are inefficient and costly, particularly when aiming for intricate structures and superior microstructure, as they often require separate production and assembly of rim well, rim center, and hub, and lack rapid solidification techniques.
Innovation Solution
The method involves die casting of a casting material in a mold where the rim well, rim center, and hub are formed integrally and continuously, with post-compaction of the casting material to prevent shrinkage porosity and enhance microstructure, allowing for faster and more cost-effective production of automobile rims with filigree structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate production and assembly of rim well, rim center, and hub are used, then manufacturing flexibility is improved, but production time and cost increase
Solution Approach 1:
The patent merges the rim well, rim center, and hub into a single integrated casting process. The die casting mold is designed to form all three components simultaneously as one integral structure, eliminating the need for separate production and assembly operations. This resolving the contradiction by combining multiple manufacturing steps into one continuous process, thereby reducing production time while maintaining manufacturing flexibility through the integrated mold design.
2Ease of manufacture
If conventional casting methods are used, then production cost is reduced, but microstructure quality and fatigue strength deteriorate
Solution Approach 1:
The patent applies parameter changes by implementing post-compaction of the casting material during the die casting process. This involves applying additional pressure to the molten aluminum or aluminum alloy after it fills the mold but before solidification is complete. This parameter change (applying compaction pressure) eliminates shrinkage porosity and improves microstructure quality and fatigue strength while maintaining the cost-effectiveness of die casting, as the compaction is integrated into the existing casting cycle.
3Ease of manufacture
If rapid solidification is not applied, then production simplicity is maintained, but microstructure and fatigue strength are insufficient
Solution Approach 1:
The patent utilizes phase transitions by controlling the solidification process of the aluminum or aluminum alloy in the die casting mold. The rapid cooling inherent in die casting creates a controlled phase transition from liquid to solid, producing a refined microstructure. Additionally, the post-compaction step applied during the phase change period enhances the microstructure by preventing shrinkage porosity formation, thereby improving fatigue strength while maintaining production simplicity through the integrated die casting process.
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 enables rapid, cost-effective production of automobile rims with improved microstructure and fatigue strength, reducing production time and increasing output while maintaining low wall thickness and intricate designs.
Implementation Method 1
The automobile rim is produced integrally and continuously in a casting mold by die casting of a casting material
Implementation Method 2
enables a particularly rapid and cost-effective production of the automobile rim having particularly filigree structures and a particularly good microstructure
Implementation Method 3
after the introduction of the casting material into the casting mold, a volume of the casting mold is reduced for post compaction of the casting material
Data Source
AI summary
A method for producing an automobile rim from aluminum or an aluminum alloy for a wheel of a motor vehicle. The automobile rim has a rim well delimited on opposite sides by an outer flange and an inner flange, a hub having a center recess and a bolt hole circle, and a rim center connecting the rim well and the hub to one another. The automobile rim is produced integrally and continuously in a casting mold by die casting of a casting material. After the introduction of the casting material into the casting mold, a volume of the casting mold is reduced for post-compaction of the casting material. The invention furthermore relates to a device for producing an automobile rim.