SLS 3D Printing Uniformity via Glass Bubble Specific Gravity
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Solution Overview
Problem
In selective laser sintering (SLS) 3D printing, the use of inorganic materials to enhance mechanical properties is hindered by positional dispersion due to differences in specific gravity between the powder and inorganic materials, resulting in non-uniform physical properties in the final product.
Innovation Solution
A method involving the preparation of a mixed powder material by mixing resin powder with glass bubbles of specific gravity 0.8 to 1.2 times that of the resin powder, which are then selectively sintered using a laser, with the glass bubbles' outer diameter adjusted to minimize pore creation and ensure uniform dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inorganic materials (e.g., glass beads, glass bubbles, glass staple fibers) are mixed with powder to improve mechanical properties, then the mechanical properties of the printed product are enhanced, but positional dispersion of the inorganic material occurs due to difference in specific gravity resulting in non-uniform physical properties at different positions
Solution Approach 1:
The patent changes the physical parameter of the inorganic material by using glass bubbles with controlled specific gravity (0.8 to 1.2 times that of resin powder) and specific size ranges (0.5 to 2.0 times the resin powder diameter). This parameter optimization prevents gravitational separation during the SLS printing process while maintaining mechanical property enhancement.
Solution Approach 2:
The patent creates a composite powder material system consisting of resin powder and glass bubbles with specifically matched physical properties. This composite approach allows the inorganic material to reinforce the resin matrix without causing dispersion issues, achieving both improved mechanical properties and uniform composition distribution.
2Strength
If glass bubbles with larger size are used, then the mechanical properties are improved, but pores and holes are created during laser irradiation resulting in reduced surface smoothness
Solution Approach 1:
The patent optimizes the size parameter of glass bubbles by specifying that their outer diameter should be 0.5 to 2.0 times the diameter of resin powder particles. This size control ensures that glass bubbles are small enough to be fully embedded during sintering without creating visible pores or holes, while still providing mechanical reinforcement.
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 results in three-dimensional products with improved mechanical properties and surface smoothness, as the controlled specific gravity of glass bubbles ensures uniform physical properties throughout the printed product.
Implementation Method 1
selectively sintering the mixed powder material by irradiating the material using a laser according to 3D data of the product to be manufactured
Implementation Method 2
selectively sintering the mixed powder material by irradiating the material using a laser
Data Source
AI summary
The present invention provides a method of manufacturing a three-dimensional product having uniform mechanical properties using an SLS 3D printer including the steps of: preparing a mixed powder material by mixing resin powder and glass bubbles, wherein the specific gravity of the glass bubbles is from about 0.8 to about 1.2 times that of the resin powder; supplying the mixed powder material to the 3D printer using a roller; and selectively sintering the mixed powder material by irradiating the powder material using a laser based on 3D data of the product to be manufactured.