Sheet Substrate Retention Device for Additive Manufacturing
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Solution Overview
Problem
Additive manufacturing systems face challenges in retaining a polymeric sheet substrate during the printing process due to heat-induced deformation, which prevents a vacuum from forming between the substrate and the build platen, leading to misalignment and instability.
Innovation Solution
A retention device with a frame that presses the edge portions of the sheet substrate against the platen's support surface, combined with a vacuum system, ensures secure retention and alignment of the substrate, preventing curling and misalignment, and allowing for faster preparation and improved printing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum pressure is applied to secure the sheet substrate to the build platen, then the sheet substrate retention is improved, but heat-induced deformation (curling) prevents vacuum formation, worsening retention reliability
Solution Approach 1:
The retention device is activated before heating begins to preliminarily secure the sheet substrate to the build platen. By establishing mechanical retention first through the retention device, the system prevents heat-induced curling from causing misalignment before the heating process starts, ensuring the substrate remains flat and properly positioned throughout subsequent heating and printing operations
2Manufacturing precision
If the sheet substrate is heated to delay solidification of extruded material, then printing quality is improved, but heat-induced curling occurs, worsening substrate stability
Solution Approach 1:
The retention device applies preliminary counteracting force to prevent heat-induced curling before it occurs. By securing the sheet substrate edges to the build platen in advance, the retention device counteracts the thermal expansion and curling forces that will develop during heating, allowing the substrate to remain flat and stable throughout the heated printing process without compromising printing quality
3Strength
If a thick sheet substrate is used to maintain stability, then substrate rigidity is improved, but preparation time increases, worsening productivity
Solution Approach 1:
The retention device acts as an intermediary between the thin sheet substrate and the build platen, providing the mechanical support and stability that would otherwise require a thick substrate. By securing the edges of thin substrates to the rigid build platen, the retention device enables the use of thinner, faster-preparing materials while maintaining the stability needed for accurate printing
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 solution effectively retains the sheet substrate, enabling the use of thinner materials and reducing preparation time, thus enhancing the ease of use and efficiency of the additive manufacturing system.
Implementation Method 1
vacuum pressure may be applied between the polymeric sheet substrate and the build platen to secure the sheet to the platen
Data Source
AI summary
An additive manufacturing system for forming 3D parts includes a platen, a gantry, at least one print head, and a retention device. The gantry is configured to move the platen along a vertical axis. The at least one print head is configured to extrude part and/or support material onto a sheet substrate that is positioned on a support surface of the platen. The retention device includes a frame that is configured to press two or more edge portions of the sheet substrate against the support surface of the platen when the retention device is in a lowered position relative to the platen or support surface.