Additive Manufacturing Build Platforms With Flexible Membrane Sealing
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Solution Overview
Problem
Additive manufacturing systems face challenges with build material leakage and contamination of mechanical and electrical components due to the migration of uncoalesced powder during the layer-by-layer construction process.
Innovation Solution
A flexible membrane is attached to the movable base of the build unit, forming a seal with the sidewall to contain the build material within the chamber, and a tensioning mechanism maintains the membrane's tension to ensure it returns to its initial configuration after the process, preventing powder migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid seal is used to contain build material, then sealing effectiveness is improved, but device complexity and difficulty of accommodation increases
Solution Approach 1:
The patent applies a flexible membrane instead of a rigid seal to contain build material within the build chamber. The membrane is attached to the movable base and extends along the sidewall, forming a flexible barrier that adapts to the changing volume of the build chamber as layers are deposited. This flexible approach maintains sealing effectiveness while avoiding the complexity of rigid sealing mechanisms that would need to accommodate base movement and volume changes.
2Productivity
If the build chamber volume is increased to accommodate more build material, then productivity is improved, but the risk of powder migration and contamination increases
Solution Approach 1:
The patent implements a dynamic sealing solution where the membrane is attached to the movable base, allowing it to move together with the base as the build chamber volume changes during the layer-by-layer construction process. This dynamic configuration maintains continuous sealing contact with the sidewall regardless of volume changes, preventing powder migration while accommodating increased build material volume for improved productivity.
Solution Approach 2:
The flexible membrane acts as an intermediary barrier between the build material and the external environment. It provides a continuous seal that adapts to volume changes, preventing direct contact between uncoalesced powder and mechanical/electrical components outside the build chamber, thus eliminating the contamination risk associated with larger build chamber volumes.
3Device complexity
If a flexible membrane is used to contain build material, then device complexity is reduced, but the membrane may not maintain adequate tension to prevent powder leakage
Solution Approach 1:
The patent addresses the tension maintenance issue by changing the physical parameters of the membrane system. The membrane is made from elastically deformable material and is configured with specific geometric parameters (extending from the base along the sidewall) to maintain adequate tension. The elastic properties of the membrane material allow it to self-regulate tension as the build chamber volume changes, maintaining sealing effectiveness without complex tensioning mechanisms.
Data Source
AI summary
According to an example, a device comprises a sidewall and a base movable relative to the sidewall. The sidewall and base define an internal volume for receipt of build material in an additive manufacturing process. The example device further comprises a membrane. A first end of the membrane is attached to the base such that the membrane is movable with the base. The membrane at least partially extends along the sidewall to form a flexible barrier between the internal volume and the sidewall.