Inert Gas Exhausting Device for Low-Pressure Aluminum Alloy Wheel Casting
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Solution Overview
Problem
Aluminum alloy wheel production in low-pressure casting processes is plagued by oxidation slag inclusion defects due to exposure to atmospheric oxygen, which weakens the mechanical properties and service life of the wheels and is difficult to detect through X-ray inspection.
Innovation Solution
An exhausting device for the casting mold that uses inert gas, such as argon or nitrogen, to create a protective atmosphere by automatically introducing gas through gas inlet plugs and exhausting air through an exhausting plug, ensuring a oxygen-free environment for molten aluminum filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mold cavity is exposed to atmospheric environment during low-pressure casting, then the mold filling process is simple and open, but oxidation slag inclusion defects occur due to contact between molten aluminum and oxygen
Solution Approach 1:
The patent introduces an inert gas (nitrogen or argon) protection system that fills the mold cavity with inert gas before and during the molten aluminum filling process. Gas inlet plugs are positioned at the bottom of the cavity to ensure complete displacement of atmospheric air, creating an oxygen-free environment that prevents oxidation slag inclusion while maintaining process simplicity
Solution Approach 2:
The system performs preliminary action by introducing inert gas into the mold cavity before molten aluminum is poured in. The control system activates gas inlet plugs in advance to establish the protective atmosphere, ensuring that when molten aluminum contacts the cavity, no oxygen is present to cause oxidation defects
2Object-affected harmful factors
If an exhausting plug is arranged at the inner rim to exhaust air during mold filling, then some air can be removed, but the exhaustion effect is not obvious and air residue remains in the cavity
Solution Approach 1:
Instead of only exhausting air from the top (traditional approach), the patent inverts the approach by introducing inert gas from the bottom of the cavity through gas inlet plugs. This bottom-up gas introduction method pushes air upward and out through the exhausting plug more effectively, completely removing air residue that top-only exhaustion cannot eliminate
Solution Approach 2:
The patent uses inert gas as an intermediary substance to displace air from the cavity. The inert gas acts as a mediator that flows through the cavity, pushing air out through the exhausting plug while creating a protective atmosphere, thereby achieving complete air removal that direct exhaustion cannot accomplish
3Object-affected harmful factors
If inert gas is introduced through gas inlet plugs at the bottom mold window position, then the entire cavity can be filled with inert gas protection atmosphere, but the device complexity increases with additional components
Solution Approach 1:
The gas inlet plugs serve multiple functions: they introduce inert gas into the cavity, position gas injection points optimally at the bottom window, and can be integrated with existing mold structures. The exhausting plug similarly serves both air removal and inert gas exit functions, reducing the need for separate dedicated components and minimizing overall device complexity
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 solution effectively reduces the occurrence of oxidation slag inclusions, enhancing the internal quality and mechanical properties of the castings while prolonging their service life by maintaining a consistent inert gas protection during the mold filling process.
Implementation Method 1
gas enters a cavity through the bottom mold gas inlet plugs under the pressure effect
Implementation Method 2
the exhausting plug is arranged at an inner rim to make the gas in the cavity exhausted smoothly during molten aluminum mold filling
Implementation Method 3
the whole mold cavity is always located in an inert gas protection atmosphere, direct contact between molten aluminum and oxygen is avoided
Data Source
AI summary
An exhausting device of a low-pressure aluminum alloy wheel casting mold, which includes a control mainframe, a connecting line, a gas storage station, a ventilating pipeline, gas inlet plugs, an exhausting plug and the like, the control mainframe is connected with the gas storage station through the connecting line, and the gas storage station is connected with the gas inlet plugs through the ventilating pipeline; the gas inlet plugs are arranged at the bottom mold window; the mold filling process of the high-temperature molten aluminum can be completed in a relatively oxygen-free environment, direct contact between the molten aluminum and oxygen is avoided, and the occurrence probability of the oxidation slag inclusion defect in the wheel casting process is effectively controlled, so that the internal quality of the casting is remarkably improved.