Low-Pressure Casting Melt Flow Control via Magnetic Field
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Solution Overview
Problem
Existing electromagnetic pumps are inefficient when handling paramagnetic materials like aluminum, as they exhibit poor efficacy in conveying melts during the casting process.
Innovation Solution
A method and device that use a low-pressure casting device with a magnetic field applied against the melt flow direction in the riser tube, combined with compressed air pressurization, to control the flow speed and homogenize the melt, and the application of current to enhance the magnetic force effect, allowing for improved control over the filling speed and structure of the solidified material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an electromagnetic pump is used to convey the melt, then the melt can be transported from the furnace to the mold, but the pump exhibits poor efficacy when handling paramagnetic materials like aluminum
Solution Approach 1:
The patent replaces the electromagnetic pump with a mechanical pressurization system using compressed air to convey the melt through the riser tube. This substitution eliminates the reliance on electromagnetic forces that are ineffective for paramagnetic materials, while maintaining reliable melt transport capability.
Solution Approach 2:
The patent applies a magnetic field periodically or selectively in specific regions (such as the riser tube or mold cavity) during the casting process. This periodic magnetic field application serves to homogenize the melt and control solidification, compensating for the absence of continuous electromagnetic pumping while addressing the specific challenges of paramagnetic material handling.
2Speed
If the melt flows quickly into the mold cavity, then the filling speed is high, but the melt cannot be homogenized and defects may occur
Solution Approach 1:
The patent applies a magnetic field periodically during the melt filling process to create homogenization effects. The magnetic field is applied in specific regions (riser tube or mold cavity) at critical moments to decelerate and homogenize the melt flow, ensuring uniform composition while maintaining overall high filling speed.
Solution Approach 2:
The magnetic field is applied locally in specific regions such as the riser tube or mold cavity rather than uniformly throughout the entire system. This localized application allows the magnetic field to affect melt homogeneity and solidification in critical areas without interfering with the overall filling speed.
3Productivity
If individual workpieces are cast successively with one filling, then productivity increases, but the filling speed progression varies between workpieces
Solution Approach 1:
The patent uses sensors to detect the filling state of the mold cavity and provides feedback control. Based on this feedback, the magnetic field application and compressed air pressurization are adjusted to maintain consistent filling speed progression across multiple workpieces cast in sequence from a single furnace filling.
Solution Approach 2:
The patent employs dynamic control of the magnetic field strength and compressed air pressure during the casting process. The parameters are adjusted in real-time based on the filling progression to ensure uniform filling speed characteristics across multiple workpieces, enabling consistent quality in successive casting operations.
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 effective conveyance and solidification of paramagnetic materials like aluminum, reducing defects and improving the structural strength and uniformity of the cast products by controlling flow speed and structure formation.
Implementation Method 1
a magnetic field acting against the conveying direction of the melt is applied to the melt of the metallic material by means of a magnetic element arranged in the region of the riser tube
Implementation Method 2
the magnetic field is created by means of an electromagnet
Implementation Method 3
the melt of the metallic material is subjected to current by means of a first electrode and a second electrode, which contact the metallic material, and simultaneously a magnetic field acts on the region of the melt that is subjected to the current
Implementation Method 4
by pressurizing the receiving space with compressed air, the melt in the riser tube of the furnace is pressed into a mold cavity of a mold
Data Source
AI summary
The invention relates to a method and a device for casting a melt 4 of a metallic material by means of a furnace 2 of a low pressure casting device, which furnace 2 has a receiving space 3 and a riser tube protruding into said receiving space 3. By pressurizing the receiving space 3 with compressed air, the melt 4 in the riser tube 12 of the furnace 2 is pressed into a mold cavity 10 of a mold 7, wherein simultaneously, a magnetic field acting against the conveying direction 23 of the melt 4 is applied to the melt 4 of the metallic material by means of a magnetic element 16 arranged in the region of the riser tube 12.