Aluminum Alloy for Pressure Washer Pump Components
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Solution Overview
Problem
Pressure washer pumps experience fatigue and failure due to stress surges from cyclic pressure loads, necessitating the use of expensive materials like forged brass or stainless steel to extend their service life, which increases weight and cost.
Innovation Solution
An aluminum alloy composition with specific weight percentages of silicon, copper, titanium, iron, manganese, zinc, and tin is developed for die casting, providing increased durability and fatigue resistance, allowing for the production of lighter, cost-effective die cast components for pressure washer pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional die casting aluminum alloys are used, then manufacturing cost is reduced, but strength and fatigue resistance are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the aluminum alloy. Specifically, it optimizes the content ranges of silicon (7.5-9.5 wt.%), copper (3.0-4.0 wt.%), and titanium (0.01-5.0 wt.%) to achieve enhanced strength and fatigue resistance while maintaining die casting manufacturability. This compositional parameter optimization allows the material to meet both performance and manufacturing cost requirements.
Solution Approach 2:
The patent creates a composite aluminum alloy system by combining multiple alloying elements (silicon, copper, titanium, iron, manganese, zinc, and tin) in specific proportions. This composite material approach leverages the synergistic effects of different elements to achieve superior mechanical properties and fatigue resistance compared to conventional single-element or simple alloy systems, while remaining suitable for die casting processes.
2Reliability
If forged brass or stainless steel is used, then service life is extended, but weight and cost increase
Solution Approach 1:
The patent uses parameter changes to optimize the aluminum alloy composition for enhanced fatigue resistance and service life. By carefully controlling the content of strengthening elements like copper (3.0-4.0 wt.%) and silicon (7.5-9.5 wt.%) along with titanium additions, the alloy achieves mechanical properties and durability comparable to heavier materials like forged brass or stainless steel, thereby extending service life while maintaining the weight advantage of aluminum.
Solution Approach 2:
The patent enables the use of lighter, more cost-effective aluminum alloy components that can achieve extended service life through optimized composition rather than relying on heavier, more expensive materials. This approach allows for the design of pump components that are both lighter and more economical while meeting durability requirements through material science optimization rather than brute-force material substitution.
3Reliability
If aluminum alloy with enhanced strength is used, then fatigue resistance is improved, but machinability may deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the aluminum alloy composition to balance strength enhancement with machinability. The specific composition ranges—silicon (7.5-9.5 wt.%), copper (3.0-4.0 wt.%), titanium (0.01-5.0 wt.%), and controlled levels of iron, manganese, zinc, and tin—create an alloy that achieves improved fatigue resistance while maintaining adequate machinability for manufacturing pump components. The balanced formulation avoids excessive hardness that would compromise machining operations.
Data Source
AI summary
An aluminum alloy is provided including between about 7.5-9.5 wt. % silicon, between about 3.0-4.0 wt. % copper, and between about 0.01-5.0 wt. % titanium. The aluminum alloy may include up to about 1.3 wt. % iron, up to about 0.5 wt. % manganese, up to about 0.1 wt. % magnesium, up to about 3.0 wt. % zinc, and up to about 0.35 wt. % tin. The balance of the aluminum alloy may include aluminum.