Laser Solid Forming Device With Magnetic Field Generator
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Solution Overview
Problem
Laser solid forming technology faces challenges in achieving precise surface finish due to molten pool instability and incomplete melting, leading to semi- or un-melted particles at the periphery, which negatively impact the surface quality of metal components.
Innovation Solution
A laser-solid-forming manufacturing device incorporating a spiral copper coil with a magnetic field generator, where a magnetic field is applied perpendicular to the molten pool to induce a Lorentz force that counteracts molten metal flow, thereby improving surface finish by reducing un-melted particles and enhancing the three-dimensional combination strength of molten pools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser beam acts on metal powders to form molten pool, then metal component is formed, but surface finish deteriorates due to molten metal flow and unstable gas-liquid interface
Solution Approach 1:
A magnetic field is introduced as an intermediary to act on the molten metal within the pool. The magnetic field generates Lorentz force that counteracts the natural convection flow of molten metal from center to periphery, stabilizing the gas-liquid interface and preventing semi-melted particles from attaching to the periphery, thereby improving surface finish without altering the fundamental laser solid forming process
2Productivity
If high-energy laser beam melts metal powders quickly, then forming efficiency is improved, but incomplete melting occurs at boundary leading to un-melted particles
Solution Approach 1:
The magnetic field serves as a mediator that enhances the melting completeness at the boundary. By generating Lorentz force that opposes the outward flow of molten metal, the magnetic field increases the residence time of metal particles in the molten state at the periphery, allowing more complete melting before solidification occurs, thus eliminating un-melted particles while maintaining high forming efficiency
3Temperature
If molten metal flows from center to periphery due to temperature gradient, then heat transfer is enhanced, but gas-liquid interface becomes unstable
Solution Approach 1:
The magnetic field is introduced as a controlling intermediary that acts perpendicular to the direction of molten metal flow. The resulting Lorentz force directly counterbalances the driving force of thermal convection, suppressing the instability of the gas-liquid interface while allowing heat transfer to continue through the molten pool, thus maintaining temperature distribution without sacrificing interface stability
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 magnetic field effectively restrains molten metal flow, improving surface finish by reducing un-melted particles and enhancing the three-dimensional strength of formed components, thus addressing the instability and incomplete melting issues in laser solid forming.
Implementation Method 1
A magnetic field is applied perpendicular to the molten pool to induce a Lorentz force that counteracts molten metal flow
Implementation Method 2
induce a Lorentz force that counteracts molten metal flow
Data Source
AI summary
A laser-solid-forming manufacturing device includes a laser emitter, a magnetic field generator, and a forming platform. The laser emitter emits a laser beam which acts on a feedstock to form a molten pool. The magnetic field generator includes a spiral copper coil, a first electrode and a second electrode. The spiral copper coil is formed by spirally winding a copper tube. The first and second electrodes are arranged at respective ends of the copper tube and are used for loading a voltage to generate a magnetic field in the spiral copper coil. At any time, the spiral copper coil sleeves an action point of the laser beam and the feedstock. A corresponding laser-solid-forming manufacturing method is also presented.