Hem Flange Dehydration via Low-Pressure Evaporation
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Solution Overview
Problem
Existing methods for removing liquid contaminants from partially closed voids in sheet metal assemblies, such as hem flanges, are inefficient and costly, often resulting in boiling off during heat-treating processes, which leads to surface defects.
Innovation Solution
Reducing air pressure around the liquid contaminants using high-velocity heated air to increase the boiling point, preventing boiling and promoting rapid evaporation without surface defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the assembly is heated to high temperatures during heat-treating, then the coating process can be completed, but liquid contaminants in voids boil off and create surface defects
Solution Approach 1:
The patent applies preliminary action by using compressed air to blow liquid contaminants out of hem flange voids before the heat-treating process begins. This pre-cleaning step prevents the contaminants from being present when high temperatures are applied, thereby avoiding boiling and surface defects while allowing the heat-treating process to proceed at required temperatures.
2Loss of substance
If compressed air is blown into flanges to remove liquid, then liquid removal is attempted, but the method has not been successful
Solution Approach 1:
The patent applies local quality by positioning compressed air nozzles to target specific hem flange locations where liquid accumulates. Rather than generic air blowing, the system directs compressed air precisely at void areas needing cleaning, improving the effectiveness of liquid removal while maintaining reliability.
3Reliability
If seal welding or expandable weld sealer is applied to hem flanges, then liquid containment is improved, but the cost becomes prohibitive
Solution Approach 1:
The patent applies the taking out principle by extracting liquid contaminants from hem flange voids using compressed air before heat-treating. Instead of containing liquids through expensive welding or sealers, the system removes the problematic liquid entirely, achieving reliable liquid management through a cost-effective extraction method.
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
The method effectively removes liquid contaminants from voids in sheet metal assemblies by maintaining a high evaporation rate without boiling, improving manufacturing efficiency and reducing costs.
Implementation Method 1
Reducing air pressure around the liquid contaminants using high-velocity heated air to increase the boiling point
Implementation Method 2
promoting rapid evaporation without surface defects
Implementation Method 3
high-velocity heated air
Data Source
AI summary
As a metal assembly, which defines partially open voids in which liquid accumulates is conveyed through a heat-treating station, the hot air is blown across the open end of the void to produce a zone of low pressure at the surface of the liquid. The reduction in pressure and relatively high temperature promote rapid vaporization of the liquid while discouraging boiling of the liquid.