Multi-Head Solid Freeform Fabrication for Material Shrinkage Compensation

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Solution Overview

Problem

Conventional solid freeform fabrication techniques have limited throughput and material variety when using multiple modeling materials, and struggle with achieving desired material properties, especially those that exhibit significant shrinkage during polymerization.

Innovation Solution

A system with multiple dispensing heads that operates in different modes, allowing for simultaneous or sequential dispensing of various modeling materials to form composite materials with specific properties, including the use of non-solidifiable materials that can be combined to create solidifiable mixtures, enabling the fabrication of objects with complex material distributions and properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple modeling materials are used in conventional solid freeform fabrication, then material variety is improved, but throughput deteriorates

Engineering Contradiction:

Improvematerial varietyVSAvoidthroughput

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent divides the single dispensing head into multiple dispensing heads, with each head dedicated to dispensing a specific modeling material. This segmentation allows simultaneous dispensing of multiple materials without interfering with each other, thereby maintaining high throughput while achieving diverse material variety in the fabricated object.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If multiple modeling materials are used in conventional solid freeform fabrication, then material variety is improved, but device complexity deteriorates

Engineering Contradiction:

Improvematerial varietyVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the dispensing function into separate dispensing heads, each specialized for a specific material. This modular approach reduces device complexity by avoiding the need for complex material switching mechanisms within a single head, while still enabling the fabrication of multi-material objects.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If materials with significant shrinkage during polymerization are used, then material properties are improved, but manufacturing precision deteriorates

Engineering Contradiction:

Improvematerial propertiesVSAvoiddimensional accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies a coating layer to the surface of the object before the shrinkage-prone material is dispensed. This preliminary coating acts as a compensatory measure that counteracts the dimensional changes caused by shrinkage during polymerization, thereby maintaining manufacturing precision while allowing the use of materials with significant shrinkage properties.

Inventive Principle:

Principle #10Preliminary action

4Device complexity

If a single dispensing head dispenses multiple materials sequentially, then device complexity is reduced, but manufacturing precision deteriorates

Engineering Contradiction:

Improvedevice simplicityVSAvoidmaterial distribution accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent segments the dispensing function into separate dispensing heads, each dedicated to a specific material. This eliminates the need for sequential material switching within a single head, thereby maintaining manufacturing precision through simultaneous, non-interfering material dispensing while keeping the overall device architecture relatively simple.

Inventive Principle:

Principle #1Segmentation

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 significantly increases the variety and complexity of materials that can be used, allowing for the creation of objects with properties difficult to achieve in traditional methods, such as objects with different surface and internal materials, and addresses issues like material shrinkage during fabrication.

Implementation Method 1

A system with multiple dispensing heads that operates in different modes, allowing for simultaneous or sequential dispensing of various modeling materials

Methodology Applied

Scientific EffectDispensing:

Implementation Method 2

the use of non-solidifiable materials that can be combined to create solidifiable mixtures, enabling the fabrication of objects with complex material distributions and properties

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Implementation Method 3

The basic operation of any SFF system consists of slicing a three-dimensional computer model into thin cross sections, translating the result into two-dimensional position data and feeding the data to control equipment which fabricates a three-dimensional structure in a layerwise manner

Methodology Applied

Scientific EffectSolidification:

Data Source

PatentUS20250010554A1Solid freeform fabrication using a plurality of modeling materials

Publication Date: 2025.01.09 STRATASYS LTD

AI summary

A system and methods for solid freeform fabrication of an object is disclosed. The system comprises a solid freeform fabrication apparatus having a plurality of dispensing heads, a building material supply apparatus configured to supply a plurality of building materials to the fabrication apparatus, and a control unit configured for controlling the fabrication apparatus and the supply apparatus based on an operation mode selected from a plurality of predetermined operation modes.