Build Material Escapement Assembly for Uniform Powder Distribution
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Solution Overview
Problem
Conventional additive manufacturing systems face issues with inconsistent distribution of build material, leading to excess material accumulation near the perimeter of the build area, resulting in irregularities and inefficiencies in the objects formed.
Innovation Solution
The implementation of a build material escapement assembly that includes a retaining plate, base, support frame, diaphragm, and retractable plate, which uses positive and negative pressure to manage and redistribute excess build material, ensuring consistent distribution across the build platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional recoat apparatuses are used to distribute build material, then the additive manufacturing process can proceed, but inconsistent distribution of build material occurs leading to excess material accumulation near the perimeter
Solution Approach 1:
The escapement assembly extracts excess build material from the build area through a separate collection zone. The recoat apparatus distributes material while the escapement assembly simultaneously removes surplus material that accumulates at the perimeter, preventing inconsistency in the final build layer.
Solution Approach 2:
The escapement assembly acts as an intermediary between the recoat apparatus and the build platform. It receives excess material from the distribution process and manages it in a collection zone, mediating the flow of material to ensure uniform distribution across the build area.
2Ease of manufacture
If excess build material accumulates near the perimeter of the build area, then material distribution can be simplified, but irregularities are formed in the built objects
Solution Approach 1:
The escapement assembly converts the harmful effect of excess material accumulation into a beneficial process. By designing the escapement zone to receive and collect surplus material, the system transforms what would be a defect (irregularities) into a controlled feature (material collection and redistribution).
3Manufacturing precision
If a build material escapement assembly is implemented to manage excess material, then build layer uniformity is improved, but device complexity increases
Solution Approach 1:
The escapement assembly performs multiple functions within a single integrated structure: it collects excess material, stores it in a collection zone, and enables redistribution. This multi-functionality reduces the need for separate components for each function, thereby managing complexity while achieving uniform build layers.
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 build material escapement assembly effectively manages and redistributes excess material, enhancing the uniformity of build layers and improving the quality and efficiency of the additive manufacturing process.
Implementation Method 1
the top plate is movable between a retracted position by applying a negative pressure and an extended position by applying a positive pressure to the cavity via the plurality of connectors
Data Source
AI summary
A build material escapement assembly for an additive manufacturing system includes a retaining plate for coupling the build material escapement assembly to the additive manufacturing system. A base having a plurality of ports is disposed beneath the retaining plate, and a support frame is disposed within the base. A diaphragm is disposed around the base, and a retractable plate is disposed between the support frame and the diaphragm. A top plate is further coupled to the retractable plate through the diaphragm and a plurality of connectors are coupled to the plurality of ports of the base. The base, support frame, diaphragm, retractable plate, and top plate define a cavity, and the top plate is movable between a retracted position by applying a negative pressure and an extended position by applying positive pressure to the cavity via the plurality of connectors.