Multi-Powder Laser Stack Formation for Shape and Stress Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current stack formation techniques face challenges in precisely controlling the layering and shaping of materials, particularly when using multiple metallic powders, as they often result in irregular shapes and residual stress due to inadequate control over material ratios and laser application.
Innovation Solution
A stack forming apparatus equipped with a nozzle system that can selectively inject and mix different metallic powders, combined with a controller that adjusts the supply of materials and laser light to achieve precise layer formation, annealing, and trimming to ensure the desired shape and material ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional powder layering and laser solidification methods are used, then stack formation can be achieved, but irregular shapes and residual stress occur due to inadequate control over material ratios and laser application
Solution Approach 1:
The patent applies parameter changes by systematically adjusting laser power, scanning speed, and powder feed rate to optimize the manufacturing process. The controller dynamically modifies these parameters based on the current layer state and material properties, enabling precise shape control while minimizing residual stress through optimized thermal cycles
Solution Approach 2:
The patent implements feedback control by monitoring the actual material deposition and laser interaction in real-time. The controller adjusts laser parameters and powder supply based on feedback from sensors that detect layer formation quality, ensuring consistent shape precision and reducing residual stress through closed-loop control
2Adaptability or versatility
If multiple metallic powders are used for complex stack formation, then material diversity is achieved, but control over material ratios becomes difficult resulting in irregular shapes
Solution Approach 1:
The patent applies segmentation by dividing the powder supply system into separate channels for different metallic powders. Each powder type is delivered through dedicated nozzles or separate powder feeds, allowing independent control of material ratios. The controller manages each powder stream separately to achieve precise compositional control in multi-material stacks
Solution Approach 2:
The patent implements local quality by enabling spatially varying material composition within the powder layer. Different regions of the build area can receive different powder mixtures or single-material layers, allowing local optimization of material properties and precise control of material ratios in different zones of the stack formation
3Power
If laser power is increased to improve shaping control, then melting efficiency increases, but excessive heat causes residual stress and deformation
Solution Approach 1:
The patent applies periodic action by using pulsed laser delivery instead of continuous illumination. The laser operates in controlled pulses with optimized duty cycles, allowing material to cool between pulses. This periodic heating reduces cumulative thermal stress while maintaining effective melting during active laser exposure, preventing deformation
Solution Approach 2:
The patent implements preliminary anti-action by applying pre-heating or pre-cooling treatments to compensate for anticipated thermal stress. The system may pre-heat surrounding areas before main laser exposure to reduce thermal gradients, or apply controlled cooling afterward to counteract stress development, preventing residual stress and deformation before they occur
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 apparatus enables the formation of stack formations with precise control over material ratios and shapes, reducing residual stress and improving strength by remelting and annealing the layers, while effectively trimming unnecessary material to achieve the predetermined shape.
Implementation Method 1
The nozzle is configured to selectively inject more than one kind of material to a target and to apply laser light to the injected material to melt the material
Implementation Method 2
remelting and annealing the layers, while effectively trimming unnecessary material to achieve the predetermined shape
Data Source
AI summary
A stack forming apparatus according to embodiments comprises a nozzle and a controller. The nozzle is configured to selectively inject more than one kind of material to a target and to apply laser light to the injected material to melt the material. The controller configured to control the kind and supply amount of material to be supplied to the nozzle.