Fluid-Expansion Holding Assembly for AM Part Blanks
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Solution Overview
Problem
Powder-bed selective melting or selective sintering methods face challenges in holding part blanks during and after manufacturing, particularly for parts with low mechanical strength, as existing methods can induce undesirable mechanical stress and struggle with removing non-melted or non-sintered powder.
Innovation Solution
A method involving a holding assembly with a deformable, additively manufactured first holding portion containing a fluid-filled inner cavity that expands during heating, reducing the gap between the part blank and the assembly to facilitate easier holding and minimize mechanical stress, while allowing for efficient removal of excess powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the part blank is held using conventional rigid fixtures during heating, then the part blank is securely held, but undesirable mechanical stress is generated on the part blank
Solution Approach 1:
The holding portion is designed with a deformable structure containing an inner cavity that can dynamically adjust its shape during heating. The cavity deforms from an initial configuration to a deformed configuration, allowing the holding portion to adapt its geometry in response to thermal expansion, thereby maintaining secure holding while reducing mechanical stress on the part blank.
Solution Approach 2:
The holding portion undergoes parameter changes through thermal expansion during heating. The material parameters of the holding portion change with temperature, causing the inner cavity to deform and the holding portion to expand, which adjusts the holding characteristics and reduces stress transmission to the part blank.
2Adaptability or versatility
If a closed inner cavity is produced in the holding portion during additive manufacturing, then the holding portion becomes deformable for stress reduction, but the shape control and mechanical strength of the part are compromised
Solution Approach 1:
The holding assembly is segmented into a holding portion and a separate part blank. The inner cavity is specifically located within the holding portion rather than the part blank, allowing the holding portion to be deformable while the part blank maintains its structural integrity and shape control.
Solution Approach 2:
The holding portion acts as an intermediary element between the heating process and the part blank. It absorbs and manages the thermal and mechanical effects through its deformable cavity structure, protecting the part blank from direct stress while enabling controlled deformation for stress reduction.
3Reliability
If the gap between the holding assembly and part blank is reduced for secure holding, then holding stability improves, but removal of non-melted powder becomes difficult
Solution Approach 1:
The holding portion is designed with a preliminary deformable structure that has sufficient initial gap for powder removal. After the part blank is manufactured and powder removal is completed, the holding portion is heated to induce deformation that reduces the gap and improves holding stability for subsequent operations.
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 method effectively holds part blanks with reduced mechanical stress and facilitates the removal of non-melted powder by creating a larger gap through fluid expansion, enhancing the manufacturing process for parts like turbine engine components.
Implementation Method 1
a heating of the holding assembly and the part blank to deform the first holding portion by fluid expansion in the inner cavity
Data Source
AI summary
A method for holding a part blank inside a holding assembly. The holding assembly includes a first holding portion. The first holding portion includes an inner cavity containing a fluid. The part blank and the first holding portion are at least partially manufactured by additive manufacturing. The holding method includes a heating of the holding assembly and the part blank to deform the first holding portion by fluid expansion in the inner cavity and to reduce a gap between the part blank and the holding assembly by expansion of the first holding portion in relation to the part blank.