Continuous Fiber Tow Placement Without Molds or Skilled Labor
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Solution Overview
Problem
Existing composite manufacturing processes are labor-intensive, require skilled labor, expensive apparatus, and molds, limiting part complexity and increasing lead times, with issues like fiber steering limitations, prepreg storage requirements, and extensive post-processing.
Innovation Solution
A tow placement process using a numeric controlled additive method that steers and deposits continuous fibers on a layer-by-layer basis, employing a fiber placement head controlled by a computer, with extrusion modes and heating elements to ensure adhesion and precision, eliminating the need for molds and skilled labor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If traditional composite manufacturing processes are used, then fiber placement can be achieved, but the process becomes labor-intensive and requires skilled labor
Solution Approach 1:
The patent replaces manual mechanical fiber placement operations with an automated computer-controlled fiber placement system. The system uses digital modeling and automated guidance to steer fiber tows along predetermined paths, eliminating the need for skilled manual labor while maintaining precise fiber placement accuracy.
Solution Approach 2:
The automated fiber placement system performs fiber placement operations independently without requiring skilled human intervention. The computer-controlled system autonomously determines fiber paths, controls the placement process, and ensures proper fiber orientation and positioning, making the process self-sufficient and eliminating skill-based operational barriers.
2Ease of manufacture
If traditional composite manufacturing processes are used, then fiber placement can be achieved, but sophisticated apparatus and molds are required, increasing costs
Solution Approach 1:
The patent extracts and eliminates the requirement for expensive molds from the manufacturing process. Instead of using traditional mold-based composite fabrication, the system directly deposits fiber tows in their final configured state onto the workpiece, removing the need for mold investment and associated complexity while reducing overall manufacturing costs.
Solution Approach 2:
The system creates a digital copy of the desired part geometry and uses computer-controlled guidance to replicate the fiber placement pattern directly onto the workpiece. This digital modeling approach replaces the need for physical molds, reducing apparatus complexity and manufacturing costs while maintaining precise geometric accuracy.
3Productivity
If traditional composite manufacturing processes are used, then fiber placement can be achieved, but lead times increase substantially
Solution Approach 1:
The system performs preliminary digital modeling and toolpath generation before actual fiber placement begins. By pre-planning the entire fiber placement sequence and preparing all necessary guidance data in advance, the system eliminates time-consuming on-site measurements and adjustments, significantly reducing manufacturing lead time while maintaining high productivity.
Solution Approach 2:
The automated fiber placement system operates continuously without interruption, maintaining constant fiber deposition speed and precision. The system eliminates idle time, setup adjustments, and manual operation transitions, ensuring continuous productive action that dramatically reduces manufacturing lead time compared to traditional intermittent processes.
4Adaptability or versatility
If fiber steering is implemented, then complex part fabrication becomes possible, but fiber steering limitations arise
Solution Approach 1:
The computer-controlled fiber placement system incorporates real-time feedback mechanisms that continuously monitor fiber position, orientation, and placement quality. The system adjusts fiber steering parameters dynamically based on actual placement conditions, maintaining high precision even when fabricating complex geometries that challenge traditional fiber steering capabilities.
Solution Approach 2:
The system uses dynamic, adjustable guidance mechanisms that can adapt fiber placement parameters in real-time during the manufacturing process. The computer-controlled system modifies fiber steering angles, speeds, and positions dynamically to accommodate complex part geometries while maintaining precise fiber orientation and placement accuracy throughout the entire fabrication process.
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
Enables the production of high-strength continuous fiber-reinforced composites at reduced costs and complexity, with improved adhesion and precision, allowing for complex part fabrication without molds and skilled labor.
Implementation Method 1
heating elements for adhesion
Implementation Method 2
heating elements for adhesion
Data Source
AI summary
The present disclosure describes a tow placement process with an extrusion mode switching. The method includes heating a roving of the desired continuous fiber material pre-impregnated with a desired matrix material; depositing said continuous fibers on a deposition surface to be steered in desired directions using a fiber placement head controlled by a computer; and said streak of fibers being steered and deposited upon each other on a layer by layer basis.