Multi-position Parallel Pressurized Casting for Aluminum Alloys
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Solution Overview
Problem
Existing casting technologies face challenges with large and complex aluminum alloy castings, including turbulence, cold shut, misrun, excessive pinholes, porosity, and oxidation, particularly in castings over 1500 kg with variable wall thickness and complex shapes, due to differential pressure control issues and atmospheric oxidation.
Innovation Solution
A multi-position parallel pressurized casting device with independent or synchronous liquid level pressure control, inert gas atmosphere protection, and staged pressurized solidification, utilizing a platform with holding furnaces, lift tubes, and a vacuum-pumping system to ensure precise pressure control and prevent oxidation during the casting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If atmospheric mold filling is used, then the casting process is simple, but serious oxidation and burning of Mg elements occur
Solution Approach 1:
The patent applies inert atmosphere protection by introducing inert gas (such as nitrogen or argon) into the mold cavity before and during the casting process. The inert gas displaces oxygen, preventing oxidation and burning of Mg elements in the aluminum alloy melt while maintaining a controlled environment for high-quality casting production
2Reliability
If low pressure/differential pressure casting with multiple tubes is used, then liquid lifting is improved, but melt fluctuates greatly in the mold cavity during filling
Solution Approach 1:
The patent segments the single pouring system into multiple independent pouring channels, each with its own pressure control. This allows differentiated pressure regulation for different regions of the mold cavity, reducing melt fluctuation and improving filling uniformity while maintaining reliable liquid lifting through the multiple lift tubes
Solution Approach 2:
The patent implements feedback control by installing sensors to monitor melt level and pressure in real-time during the casting process. The control system adjusts the pressure in each holding furnace based on feedback signals, dynamically stabilizing melt behavior in the mold cavity and preventing excessive fluctuation
3Measurement precision
If lift tube is used for mold filling, then liquid level control is achieved, but the lift tube gets easily freezed
Solution Approach 1:
The patent introduces thermal insulation material as an intermediary layer around the lift tube to prevent heat loss. This insulation layer acts as a thermal barrier between the cold external environment and the hot melt, preventing the lift tube from freezing while maintaining precise liquid level control through the temperature-stabilized tube
4Volume of moving object
If long process casting is used for large castings, then complete filling is achieved, but large area of cold shut and misrun occurs
Solution Approach 1:
The patent applies preliminary action by pre-heating the mold cavity and pouring system before introducing the melt. This preliminary heating ensures that the entire casting cavity reaches an optimal temperature distribution before filling, preventing cold shut and misrun defects even in large-volume castings with long process paths
Solution Approach 2:
The patent changes key process parameters including increasing pouring temperature, optimizing melt flow velocity, and adjusting pressure differential throughout the casting process. These parameter adjustments compensate for the long process path in large castings, maintaining melt fluidity and preventing cold shut and misrun defects
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
The solution effectively inhibits melt turbulence, reduces defects like cold shut and inclusion, and improves the quality of large aluminum alloy castings by maintaining a stable inert atmosphere, achieving high-quality castings with controlled pressure and precise mold filling, resulting in reduced porosity and oxidation, and enhanced solidification feeding capacity.
Implementation Method 1
a vacuum-pumping system...for the working chamber and/or the holding furnace
Implementation Method 2
an inert gas replacement system...for the working chamber and/or the holding furnace
Implementation Method 3
the holding furnace can realize an independent liquid level pressure control or a synchronous liquid level pressure control
Data Source
AI summary
A multi-position parallel pressurized casting device for large aluminum alloy castings and method thereof are provided. The device includes a platform, a top surface of the platform is a working surface, and a bottom of the platform is provided with a holding furnace. A number of the holding furnace is two or more, and each holding furnace is connected to a liquid filling port corresponding to the working surface by a separate lift device, and the holding furnaces can achieve independent liquid level pressure control or synchronization liquid level pressure control in any combination by a lift control system; and a cover body is also provided on the working surface, the cover body and the working surface form a sealed working chamber. A vacuum-pumping system and an inert gas replacement system for the working chamber and/or the holding furnace are further provided.