3D Printing Counter-Rotating Roller for Uniform Powder Deposition

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Solution Overview

Problem

Current 3D printing systems face challenges in achieving uniform and thin layer deposition due to friction and sheer forces generated by blades and rollers, leading to non-uniform compacting and accumulation of powder.

Innovation Solution

A 3D printing apparatus with a counter-rotating roller and a powder feeder configured as a blade, both with independently adjustable heights, to facilitate uniform powder deposition and compacting. The apparatus includes a powder distribution device with a blade-shaped end and a powder uniformization device, such as a roller, positioned at a distance from the distribution device to ensure uniformity and prevent powder accumulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a blade is used to level the powder, then the powder uniformity is improved, but the blade imposes sheer forces that disturb uniformity and prevent thin layer formation

Engineering Contradiction:

Improvepowder uniformityVSAvoidsheer forces

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent removes the blade component from the powder distribution system and replaces it with a free-fall powder distribution mechanism. This extraction eliminates the source of harmful sheer forces while maintaining powder uniformity through controlled free-fall deposition and counter-rotating roller compaction.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical blade-leveling system with a free-fall powder distribution system combined with counter-rotating rollers. This substitution eliminates contact-based sheer forces while achieving uniform thin layers through gravitational deposition and controlled compaction.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If counter-rotating rollers are used to promote powder uniformity, then lower flowability powders can be used, but powder accumulates in front of the roller and deposition becomes non-uniform

Engineering Contradiction:

Improvepowder uniformityVSAvoidpowder accumulation

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The patent inverts the traditional roller configuration by using counter-rotating rollers that rotate in opposite directions. This inversion creates a shearing action that prevents powder accumulation in front of the rollers while maintaining uniform deposition, solving the problem of powder buildup that occurs with conventional single-direction rotation.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent modifies the operational parameters of the roller system by adjusting rotation speed, gap distance, and direction of rotation. These parameter changes optimize the balance between powder uniformity and prevention of accumulation, enabling thin layer deposition without the harmful effects of powder buildup.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If powder is deposited in thin layers of 25 μm to 200 μm, then the 3D printing resolution is improved, but friction and low flowability prevent uniform deposition

Engineering Contradiction:

Improvelayer thickness controlVSAvoidpowder flowability

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent employs fluidized powder delivery systems that use pneumatic principles to suspend and transport powder particles. This approach improves powder flowability and enables uniform deposition of thin layers by preventing particle aggregation and maintaining consistent flow characteristics during the deposition process.

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The patent incorporates vibration mechanisms in the powder delivery and distribution system to enhance powder flowability. The vibration prevents particle jamming and friction-related issues, enabling smooth deposition of thin powder layers with consistent uniformity and thickness control.

Inventive Principle:

Principle #18Mechanical vibration

4Manufacturing precision

If powder accumulates in front of the roller, then the powder slides under the roller instead of rotating, but this increases compaction and creates non-uniform deposition

Engineering Contradiction:

Improvedeposition uniformityVSAvoidcompaction force

Core Design Contradiction:

Manufacturing precisionVSForce

Solution Approach 1:

The patent uses counter-rotating rollers that create a controlled shearing action, preventing powder accumulation in front of the rollers. This inversion of the traditional single-rotation system ensures powder rotates properly under the rollers rather than sliding, maintaining uniform deposition with controlled compaction forces.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS12240172B2Three-dimensional (“3D”) printing apparatus with counter-rotating roller

Publication Date: 2025.03.04 KERACEL INC

AI summary

Examples relate to a print station of a three-dimensional (“3D”) printing apparatus, and method of 3D printing, the print station including a substrate configured to hold a printed object, the substrate having a longitudinal axis, and a print system over the substrate, the print system including a powder distribution device including a blade-shaped end, and a powder uniformization device located at a distance from the powder distribution device along a direction parallel to the longitudinal axis.