Foam Board Duct Cutting with Vacuum Hold-Down
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Solution Overview
Problem
The fabrication of ducts and duct fittings from foam boards is challenging due to their fragility and the need for precise handling, as they are more delicate than sheet metal and require additional support for thermal insulation and pressure handling, necessitating improved fabrication methods and apparatus.
Innovation Solution
A machine-based system for precutting foam boards using a three-axis cutting machine with a workpiece hold-down system and vacuum assistance to create V-shaped grooves and straight cut channels, allowing for the formation of duct parts that can be assembled on-site, enabling accurate and efficient production of duct components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If foam board is used for duct fabrication, then thermal insulating properties and light weight are improved, but fragility and handling difficulty worsen
Solution Approach 1:
The patent applies preliminary action by pre-cutting the foam board into duct sections with grooves and folds before transportation. The grooves are cut at specific angles (e.g., 45 degrees) and depths to allow the board to be folded into three-dimensional duct shapes. This preliminary preparation reduces on-site assembly complexity and minimizes handling of fragile materials during installation.
Solution Approach 2:
The patent segments the foam board into multiple sections with predetermined grooves and folds. Each section can be independently handled and assembled, reducing the need to manipulate large, fragile sheets. The segmentation allows ducts to be constructed from manageable pieces that maintain structural integrity during transportation and assembly.
2Manufacturing precision
If precise cuts are made in foam board, then manufacturing precision is improved, but material waste increases
Solution Approach 1:
The patent uses computer-aided design (CAD) and computer-aided manufacturing (CAM) systems to pre-plan and pre-cut foam board patterns with high precision. The grooves are cut to exact specifications (e.g., 45-degree angles, specific depths) to ensure proper folding and assembly. This preliminary precision cutting minimizes material waste by optimizing the layout and reducing errors during on-site assembly.
Solution Approach 2:
The patent replaces manual cutting methods with automated computer-controlled cutting equipment. This substitution ensures consistent, precise cuts with minimal material waste, as the automated system can accurately follow digital patterns and adjust for material variations. The mechanical precision of automated cutting reduces the need for corrective cuts and minimizes offcuts.
3Stability of the object's composition
If foam board is handled carefully, then integrity is maintained, but fabrication complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-assembling duct sections from foam board in a controlled manufacturing environment. The grooves are cut, folds are created, and sections are joined before transportation to the job site. This preliminary assembly reduces on-site fabrication complexity and minimizes handling requirements, as the pre-assembled sections require minimal additional work during installation.
Solution Approach 2:
The patent segments the duct fabrication process into separate, manageable sections that can be independently assembled and transported. Each section maintains its integrity through careful design of grooves and folds, reducing the need for complex on-site assembly operations. The segmentation allows for standardized, repeatable assembly procedures that reduce overall fabrication complexity.
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 method allows for the accurate and efficient production of duct components with reduced on-site assembly time and improved handling, ensuring precise cuts and minimizing material waste, while maintaining the integrity of the foam board for transportation and assembly.
Implementation Method 1
means for withdrawing air from the plenum to establish and maintain a vacuum therein
Data Source
AI summary
A method for producing a duct from a planar board having two opposed substantially parallel edges with metal foil facings on opposed major surfaces of the board is disclosed. The method comprises making planar cuts through one of the metal foil facings and at least most of the planar board there below to produce a blank with 3 parallel “V shaped grooves which are parallel to angled edges of the blank. A duct is formed by folding the blank so that the “V” shaped grooves form three of the edges of the duct, and the angled edges form the fourth of the edges.