Aluminum Insert Ring for Piston Weight Reduction
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Solution Overview
Problem
Current piston manufacturing methods face challenges with securing casting quality, increasing costs, and poor bonding properties between dissimilar materials (aluminum alloy and cast iron) due to differences in thermal expansion, making it difficult to apply insert rings to forged pistons for weight reduction and durability improvement.
Innovation Solution
An aluminum alloy with a composition of 24 to 30 wt% Cu and 0.3 to 4.1 wt% Si, forming a lamellar microstructure with Al and Al2Cu phases, is used to create an insert ring with high strength and abrasion resistance, which is applied through a casting process, allowing improved bonding with the piston body and enabling forging processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cast iron-based insert ring is inserted into a piston to reinforce the top land portion, then the strength and abrasion resistance are improved, but the weight increases and bonding properties deteriorate due to differences in thermal expansion between dissimilar metals
Solution Approach 1:
The patent applies homogeneity by making the insert ring material (aluminum alloy) the same as or similar to the base material (piston body), both being aluminum alloys. This eliminates the dissimilarity between materials, ensuring compatible thermal expansion coefficients and enabling the insert ring to be applied to both cast and forged pistons while maintaining bonding properties and reducing weight.
2Strength
If a cast iron-based insert ring is used to reinforce the piston, then the bonding properties deteriorate due to poor bonding and difference in coefficient of thermal expansion, but the strength is improved
Solution Approach 1:
The patent uses homogeneity by employing aluminum alloy for both the piston body and insert ring, ensuring material compatibility and consistent thermal expansion behavior, which prevents interface separation under thermal fatigue while maintaining strength.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical composition parameters of the aluminum alloy (specifically Cu: 2-13 wt%, Si: 3-15 wt%, Fe: 0.1-5 wt%) to achieve optimal mechanical properties and bonding characteristics, ensuring both strength and reliability are improved simultaneously.
3Reliability
If surface treatment process such as AlFin process is performed to improve bonding properties, then the bonding properties are improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent eliminates the need for surface treatment processes by using homogeneous aluminum alloy materials for both the piston body and insert ring. The material compatibility ensures adequate bonding properties without requiring additional AlFin or other surface treatment processes, thereby reducing manufacturing complexity.
Solution Approach 2:
The patent extracts or removes the surface treatment process step from the manufacturing sequence by relying on material homogeneity to provide sufficient bonding properties inherently, eliminating unnecessary process steps and reducing manufacturing complexity.
4Weight of moving object
If the insert ring is applied to forged pistons for weight reduction and durability improvement, then the weight is reduced and durability is improved, but the application becomes impossible with traditional cast iron insert rings due to poor bonding properties
Solution Approach 1:
The patent applies homogeneity by using aluminum alloy for the insert ring that matches the base material, ensuring compatible thermal and mechanical properties. This enables the insert ring to be successfully applied to both cast and forged pistons, significantly improving adaptability and versatility across different piston manufacturing methods.
Data Source
AI summary
Disclosed herein are an aluminum alloy for an insert ring, an aluminum insert ring using the same, and a piston manufacturing method using the same, and, particularly, are an insert ring manufactured to have high strength and abrasion resistance and reduce its weight by adjusting aluminum alloy components, and a method of manufacturing a piston having high bonding properties to the insert ring through the same.