Conformal Support Structures for Additive Manufacturing
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Solution Overview
Problem
Additive manufacturing processes face challenges in supporting objects with downward facing convex surfaces, leading to undesirable rough textures and instability due to insufficient support resistance and thermal isolation.
Innovation Solution
The use of support structures with a concave upward surface corresponding to the downward facing convex surface, separated by unfused powder, which provides non-contact support and prevents movement, while extending to a platform for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional support structures are used for downward facing convex surfaces, then the object can be supported during manufacturing, but the surface develops rough texture due to pooling and thermal isolation
Solution Approach 1:
A layer of unfused powder is introduced as an intermediary between the support structure and the downward facing convex surface. This powder layer acts as a thermal and material barrier that prevents direct contact, thereby eliminating pooling of molten material and improving thermal dissipation. The result is a smoother surface finish on the manufactured object.
2Stability of the object's composition
If support structures extend close to the platform, then stability is improved, but movement resistance becomes insufficient for downward facing convex surfaces
Solution Approach 1:
The unfused powder layer serves as a mediator that enhances the support structure's ability to resist movement. By preventing direct thermal contact and material pooling, the powder layer allows the support structure to maintain better friction and mechanical interlocking with the build platform, thereby improving movement resistance while maintaining stability.
3Strength
If direct contact support is used for downward facing convex surfaces, then structural support is provided, but thermal isolation causes poor thermal dissipation
Solution Approach 1:
The layer of unfused powder acts as a thermal conductor intermediary that improves heat dissipation from the downward facing convex surface. While maintaining structural support through the support structure, the powder layer facilitates better thermal contact with the build platform, reducing thermal isolation and improving energy loss through controlled thermal conduction.
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 solution effectively prevents pooling and thermal dissipation issues, ensuring a smoother surface and stability for objects with downward facing convex surfaces during the additive manufacturing process.
Implementation Method 1
The physical processes associated with laser sintering or laser melting include heat transfer to a powder material and then either sintering or melting the powder material.
Implementation Method 2
sintering entails fusing (agglomerating) particles of a powder at a temperature below the melting point of the powder material
Implementation Method 3
melting entails fully melting particles of a powder to form a solid homogeneous mass
Data Source
AI summary
The present disclosure generally relates to methods for additive manufacturing (AM) that utilize conformal support structures in the process of building objects, as well as novel conformal support structures to be used within these AM processes. The conformal support structures include a first portion that extends from a platform to a concave upward surface of the first portion that is below a downward facing convex surface of the object. The concave upward surface corresponds to the downward facing convex surface. The downward facing convex surface of the object is separated from the concave upward surface of the first portion by at least one portion of unfused powder.