Stereoscopic Modeling Apparatus Powder Density Control
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Solution Overview
Problem
Existing stereoscopic modeling apparatuses using additive manufacturing face limitations in powder density due to liquid bridge adhesive forces, resulting in nonuniform density and voids in the modeled products.
Innovation Solution
A stereoscopic modeling apparatus and method that includes a modeling tank, a liquid discharger, and a powder supplier, where the modeling liquid is discharged onto the powder layer and the powder is supplied while the liquid remains on the surface, preventing void formation and ensuring uniform density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thin powder layer is formed by a leveling mechanism such as a squeegee, then the powder layer can be formed uniformly, but the powder density cannot be increased beyond the loose bulk density
Solution Approach 1:
The patent changes the physical state of the powder from loose to compacted by controlling liquid permeation. By adjusting the liquid discharge amount and timing, the powder particles are compressed together, transforming the density parameter from loose bulk density to higher compacted density while maintaining uniform layer formation.
Solution Approach 2:
The patent uses liquid hydraulics to control powder density. The modeling liquid is discharged in controlled amounts to permeate the powder layer, using liquid pressure and capillary forces to compact the powder particles together, thereby increasing density without compromising layer uniformity.
2Strength
If modeling liquid is discharged onto the powder layer to bond particles, then the powder particles are caused to migrate due to liquid bridge adhesive force, but dense portions and sparse portions randomly appear resulting in nonuniform density and voids
Solution Approach 1:
The patent performs preliminary action by controlling the liquid discharge timing and amount before the bonding process. By pre-controlling the liquid distribution and using timed discharge, the powder particles are prepared in a controlled manner that prevents random migration and ensures uniform density throughout the layer.
Solution Approach 2:
The patent implements feedback control by monitoring and adjusting the liquid discharge amount based on the actual conditions. This feedback mechanism ensures that the liquid bridges form uniformly across the powder layer, preventing the formation of dense and sparse portions while maintaining consistent bonding strength.
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 approach results in stereoscopic modeled products with improved uniformity and density, reducing voids and enhancing the quality of the three-dimensional modeled products.
Implementation Method 1
Upon impact of a droplet of a bonding liquid, the powder particles are caused to migrate due to liquid bridge adhesive force
Implementation Method 2
the powder particles are caused to migrate due to liquid bridge adhesive force
Data Source
AI summary
A stereoscopic modeling apparatus is provided. The stereoscopic modeling apparatus includes a modeling tank, a liquid discharger, and a powder supplier. In the modeling tank, a powder layer including a powder is formed and a modeling layer in which the powder in the powder layer is bonded into a required shape is laminated. The liquid discharger discharges a modeling liquid to the powder in the modeling tank. The powder supplier supplies the powder to the modeling tank. The powder supplier supplies the powder to the powder layer while at least a part of the modeling liquid discharged from the liquid discharger and adhered to a surface of the powder layer remains existing on an outermost surface of the powder layer.