3D Object Manufacturing With Grid Sacrificial Layers
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Solution Overview
Problem
Existing methods for manufacturing three-dimensional objects using sacrificial layers face challenges in ensuring both adhesion and separability between the sacrificial layer and the object, leading to difficulties in separating them after shaping.
Innovation Solution
The method involves forming a sacrificial layer with recessed portions into which the object enters, using different materials for the sacrificial layer and the object, and ensuring a grid-shaped configuration with specific interval and depth ratios to enhance adhesion and separability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If adhesion between sacrificial layer and object is ensured, then shaping quality is improved, but separability between sacrificial layer and object deteriorates
Solution Approach 1:
The sacrificial layer is segmented into a grid pattern with recessed portions, creating multiple small contact regions rather than a continuous layer. This segmentation allows the object to adhere sufficiently during shaping while enabling easy separation afterward, as the grid structure provides natural separation lines and reduces overall contact area.
Solution Approach 2:
The sacrificial layer has non-uniform local properties: the grid pattern creates regions of different contact density and the recessed portions provide localized engagement points for the object. This local variation in structure allows simultaneous achievement of adhesion where needed and separability where not needed.
2Ease of manufacture
If sacrificial layer is designed for easy separation, then separability is improved, but adhesion between sacrificial layer and object deteriorates
Solution Approach 1:
By dividing the sacrificial layer into a grid pattern, the invention creates multiple small adhesive zones that collectively provide sufficient holding force during shaping, while the segmented structure itself facilitates separation. Each grid cell acts as an independent adhesive unit.
Solution Approach 2:
The grid pattern introduces a two-dimensional structural feature to the otherwise planar sacrificial layer. This dimensional complexity allows the layer to maintain adhesion through distributed contact points while providing geometric pathways for separation.
3Strength
If sacrificial layer contact area with object is increased, then adhesion is improved, but separation difficulty increases
Solution Approach 1:
The continuous contact area is segmented into discrete grid cells, distributing the adhesive force across multiple small regions. This segmentation maintains total adhesion strength while creating natural separation planes between grid cells that facilitate easy removal.
Solution Approach 2:
The grid pattern creates a porous-like structure in the sacrificial layer, with recessed portions that allow partial penetration or engagement by the object. This porous structure provides sufficient mechanical interlocking for adhesion while maintaining open pathways for separation.
Data Source
AI summary
A method for manufacturing a three-dimensional object includes a step of forming one or more sacrificial layers by ejecting a sacrificial layer material onto a stage, a step of forming an object by ejecting an object material onto the sacrificial layer, and a step of separating the object and the sacrificial layer. The sacrificial layer material and the object material are different materials. In the step of forming the sacrificial layer, the sacrificial layer, which includes the recessed portion into which a part of the object enters, is formed at least in a portion in contact with the object.