Perforated Mold Zones for Additive Manufacturing
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Solution Overview
Problem
Traditional mold manufacturing methods for fiber-based products are costly, time-consuming, and prone to producing poor-quality products due to residual material accumulation and clogging issues, limiting design flexibility and production efficiency.
Innovation Solution
A perforated mold design with varying zones of perforations optimized for additive manufacturing, featuring distinct sets of perforations in different zones to control material distribution and flow, allowing for conformal shaping of complex products without the need for a separate screen, and incorporating support structures to prevent deformation during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional screen-and-mold system is used, then the mold can be reused for many products over long periods, but the machining process is expensive and time-consuming, limiting the number of molds and types of molds that can be produced
Solution Approach 1:
The mold is divided into a reusable base mold and a disposable screen component. The screen can be easily removed and replaced, allowing the expensive base mold to be reused while the inexpensive screen is discarded after use. This segmentation enables rapid production of different product types without re-machining the entire mold.
Solution Approach 2:
The screen component is designed as a disposable element that is inexpensive to manufacture and replace. After serving its purpose in forming a product, the screen is discarded rather than cleaned or maintained, eliminating the time-consuming cleaning process and enabling rapid switching between product designs.
2Productivity
If a traditional mesh screen is used, then the mold can be reused for many products, but residual material accumulates in holes and blocks drainage, requiring time delays for cleaning
Solution Approach 1:
The screen is designed as a disposable component that is discarded after a single use. This eliminates the problem of residual material accumulation and clogging that would require cleaning interruptions, ensuring continuous production without reliability issues related to screen contamination.
Solution Approach 2:
The screen component is extracted as a separate, removable element from the base mold. This allows the screen to be easily removed and replaced without affecting the reusable mold structure, enabling rapid switching between different screen designs for different products without cleaning interruptions.
3Device complexity
If a one-piece mold design with openings and channels is used, then the screen is not required, but the mold must be strong enough to support suction forces and product weight
Solution Approach 1:
The mold system is segmented into a strong, reusable base mold and a separate screen component. The base mold provides the necessary structural strength to withstand suction forces and product weight, while the screen provides the necessary porosity and conformal shape. This segmentation allows each component to be optimized for its specific function without compromising the other.
Solution Approach 2:
The base mold is designed with localized reinforcement features such as thicker walls and support structures in areas subjected to high stresses from suction and product weight. This local quality enhancement provides necessary strength without increasing the overall complexity or weight of the entire mold structure.
4Productivity
If additive manufacturing is used, then manufacturing is faster and design flexibility is improved, but the mold may not be optimized for producing molds in all shapes, especially those with deep internal grooves or varying densities
Solution Approach 1:
The mold system segments the complex geometry requirements into two parts: the base mold with standardized features that can be efficiently manufactured by additive manufacturing, and the screen component with the specific conformal shape required for the product. This allows the base mold to be produced quickly by AM while the screen provides the precise geometric fit for the final product.
Solution Approach 2:
The design allows for parameter changes in the screen component to optimize for different product shapes and requirements. The screen can be manufactured with varying pore sizes, densities, and conformal shapes to match specific product needs, while the base mold maintains standardized parameters suitable for efficient additive manufacturing.
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 optimized mold design enhances production efficiency by reducing clogging and material residue issues, enabling the creation of complex product shapes with uniform material distribution and improved product quality, while allowing for faster and more flexible manufacturing through additive processes.
Implementation Method 1
Either water or air, depending on the composition of the original raw material, is drawn through the mesh screen
Implementation Method 2
Either water or air, depending on the composition of the original raw material, is drawn through the mesh screen
Data Source
AI summary
Disclosed herein are perforated structures and methods for their manufacture. The perforated structures comprise zones of perforations, which are optimized for controlling the flow of gas or liquid through the perforated structure. The perforated structures may be configured for use as molds and for manufacture by additive manufacturing processes.