Screen Device Walls for Direct Hole Formation in Slurry-Molded Parts
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Solution Overview
Problem
Existing methods for forming parts from a slurry do not efficiently incorporate predefined configurations of holes or indentations, requiring additional post-processing steps which slow down the fabrication process.
Innovation Solution
A 3D fabricated screen device with integrated walls and pores is used to form parts from a slurry, where vacuum pressure forces material elements onto the device, and the walls prevent coalescence, creating predefined holes or indentations during the formation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional pulp molding methods are used without integrated walls, then the fabrication process is simpler, but additional post-processing steps are required to create holes in parts
Solution Approach 1:
The patent merges the hole-forming function directly into the screen device by integrating walls with pores among them. This combination eliminates the need for separate post-processing steps to create holes, as the walls themselves define the hole locations during the molding process. The screen device now performs dual functions: supporting the pulp material and defining hole positions simultaneously.
Solution Approach 2:
The walls are pre-formed on the screen device before the pulp molding process begins. This preliminary structuring allows holes to be automatically created at predetermined locations without requiring additional processing steps afterward. The configuration of walls is established in advance to match the desired hole pattern in the final part.
2Manufacturing precision
If walls are added to the screen device to form holes, then hole configuration is achieved during formation, but the screen device structure becomes more complex
Solution Approach 1:
The screen device features localized walls positioned at specific locations where holes are needed. Rather than making the entire screen device complex, only specific regions have additional wall structures. This localized approach achieves precise hole configuration accuracy while minimizing overall device complexity. Each wall structure is tailored to its specific location and function.
3Manufacturing precision
If walls extend above the screen device surface, then holes are effectively formed, but material elements may not properly coalesce in those areas
Solution Approach 1:
The walls extend partially above the screen device surface - enough to prevent material coalescence at wall locations and create holes, but not so much as to completely block material deposition. This partial extension is sufficient to define hole positions while allowing material to coalesce properly in areas where walls are absent, maintaining ease of manufacture for the overall part structure.
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 method allows for the direct formation of parts with predefined hole configurations, eliminating the need for post-processing and increasing fabrication speed.
Implementation Method 1
a vacuum pressure may be applied to force the liquid through the pores
Implementation Method 2
some of the material elements in the slurry may collect on the surfaces of the screen devices and coalesce
Data Source
AI summary
According to examples, an apparatus may include a processor that may access data pertaining to a part to be fabricated from material elements in a slurry of a liquid and the material elements, the data identifying a configuration of holes to be formed in the part. The processor may also access a digital model of a screen device having a plurality of pores based on the accessed data, the screen device to be used to fabricate the part, and may determine locations on a surface of the digital model of the screen device that correspond to the identified configuration of the holes to be formed in the part. The processor may further generate, at the determined locations on the surface of the digital model of the screen device, a plurality of walls that are to form the holes in the part.