Fiber-Based Solid Freeform Fabrication for Layered Components

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Solution Overview

Problem

Conventional layer-by-layer manufacturing methods for three-dimensional components face challenges with expensive coating materials, narrow process windows, and difficulties in processing irregular or fiber-shaped powders, leading to insufficient component density and high material demands.

Innovation Solution

The use of fibers as a raw material for solid freeform fabrication, where loose fibers are spread and interconnected through energy application to form solidified layers, allowing for precise dimensions and cost-effective production with optional filler materials, enabling efficient mechanical bonding and high component density.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional powder-based layer-by-layer manufacturing methods are used, then three-dimensional components can be produced, but the coating materials are expensive and the process window is narrow

Engineering Contradiction:

Improvemanufacturing process feasibilityVSAvoidmaterial cost

Core Design Contradiction:

Ease of manufactureVSQuantity of substance

Solution Approach 1:

The invention changes the fundamental material parameter from powder to fibers. This parameter change enables cost-effective production while maintaining manufacturing feasibility. The fiber-based approach allows for better processability and broader process windows compared to conventional powder methods, directly resolving the contradiction between ease of manufacture and material cost.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention employs composite fiber structures consisting of a core fiber and optionally surrounded by a sheath or filler materials. These composite structures provide both mechanical strength and cost advantages, allowing the use of less expensive fiber materials while maintaining component integrity during the layer-by-layer manufacturing process.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If irregular or fiber-shaped powders are used in conventional methods, then material variety is increased, but processing difficulties increase and component density decreases

Engineering Contradiction:

Improvematerial varietyVSAvoidcomponent density

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

Instead of attempting to process irregular fiber-shaped materials as powders (which causes processing difficulties), the invention inverts the approach by directly using fibers as the primary material form. This inversion eliminates the need for powder processing steps and directly achieves high component density through controlled fiber placement and bonding.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention changes the material form parameter from irregular powder particles to structured fibers with defined dimensions. This parameter change enables both material variety (different fiber types, compositions, and properties) and manufacturing precision (controlled fiber placement, orientation, and bonding) simultaneously, resolving the contradiction between adaptability and manufacturing precision.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If powder materials are used with defined dimensions, then manufacturing precision is improved, but material cost increases

Engineering Contradiction:

Improvedimensional controlVSAvoidmaterial cost

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The invention changes the material parameter from powder to fibers, maintaining dimensional control through the inherent structure of fibers (length, diameter, aspect ratio) while using less expensive fiber materials. The fiber dimensions can be precisely controlled during fiber production, providing manufacturing precision without the high costs associated with precision-engineered powders.

Inventive Principle:

Principle #35Parameter changes

4Strength

If high material density is achieved in conventional methods, then component strength is improved, but material waste increases

Engineering Contradiction:

Improvecomponent strengthVSAvoidmaterial waste

Core Design Contradiction:

StrengthVSLoss of substance

Solution Approach 1:

The invention applies preliminary action by pre-forming fibers with controlled dimensions and properties before the manufacturing process. This preliminary preparation enables precise fiber placement and bonding, achieving high component strength with minimal material waste. The fiber structure allows for efficient material utilization where each fiber contributes to the final component strength.

Inventive Principle:

Principle #10Preliminary action

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 approach allows for cost-effective production of shaped bodies with defined quality and high material efficiency, overcoming the limitations of conventional powder-based methods by utilizing fibers with specific dimensions and materials for improved mechanical properties and processing ease.

Implementation Method 1

loose fibers are spread and interconnected through energy application to form solidified layers

Methodology Applied

Scientific EffectEnergy application for bonding:

Data Source

PatentUS8652278B2Method for producing a shaped body using fibers

Publication Date: 2014.02.18 EVONIK OPERATIONS GMBH

AI summary

A shaped body comprised of individual, interconnected layers may be produced from fibers in accordance with a solid freeform fabrication or rapid prototyping method. The fibers may be produced by extrusion molding a thermoplastic material.