Columnar Resin Particles for Solid Freeform Fabrication
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Solution Overview
Problem
Conventional resin powders for solid freeform fabrication have inferior packing density and strength due to their irregular shapes, leading to poor fluidity and moving issues during the fabrication process.
Innovation Solution
The development of a columnar particle form with end surfaces that partially cover the side surfaces, reducing corner portions and enhancing packing density and flowability, thereby improving the strength of the fabricated objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional irregular-shaped resin powders are used, then manufacturing simplicity is maintained, but packing density and strength are inferior
Solution Approach 1:
The invention changes the geometric parameters of the particles from irregular shapes to specific columnar shapes with defined dimensions (length L and diameter D where 1.5 ≤ L/D < 3.0). This parameter transformation resolves the contradiction by establishing optimal shape parameters that simultaneously achieve high packing density and improved tensile strength while maintaining manufacturing feasibility through the extrusion process.
Solution Approach 2:
The invention employs asymmetric columnar shapes with specific dimensional ratios rather than symmetric spherical or cubic forms. The asymmetric columnar geometry with length-to-diameter ratio between 1.5 and 3.0 creates optimal interlocking and packing characteristics that enhance both packing density and mechanical strength, resolving the contradiction between shape regularity and performance.
2Ease of operation
If irregular-shaped particles are used, then manufacturing complexity is low, but fluidity and movement during fabrication are poor
Solution Approach 1:
The invention transforms particle shape parameters from irregular configurations to uniform columnar shapes with controlled length-to-diameter ratios (1.5 ≤ L/D < 3.0). This parameter standardization resolves the contradiction by creating particles with consistent geometric characteristics that exhibit superior fluidity and movement characteristics during fabrication while maintaining manufacturing simplicity through the extrusion process.
3Quantity of substance
If columnar particles with covered end surfaces are used, then packing density increases, but manufacturing complexity increases
Solution Approach 1:
The invention achieves high packing density by controlling the length-to-diameter ratio parameter within 1.5 ≤ L/D < 3.0 and ensuring end surfaces partially cover side surfaces. This parameter control resolves the contradiction by creating optimal packing geometry that can be achieved through simple extrusion and cutting processes, avoiding complex manufacturing steps while maximizing packing efficiency.
Solution Approach 2:
The manufacturing process is segmented into simple sequential steps: extrusion to form columnar shapes, cutting to achieve target dimensions, and optional surface treatment. This segmentation resolves the contradiction by breaking down the manufacturing process into basic operations that achieve the desired columnar geometry with covered end surfaces without requiring complex integrated processes.
Data Source
AI summary
A particle for solid freeform fabrication having a columnar form has end surfaces and a side surface, wherein one of the end surfaces partially covers the side surface.