Electromagnetic Dent Removal for Conductive Structures

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Solution Overview

Problem

Existing methods for removing dents from electrically conductive flat structures, such as vehicle body sheets, are inefficient due to high time and cost expenditures, surface damage, and incomplete stress relief from electromagnetic forces, which are short-lived and cannot effectively eliminate residual stresses.

Innovation Solution

A method combining heat and electromagnetic force using an induction coil to generate an electromagnetic field that heats and expands the material, allowing it to snap back into a smooth state without mechanical forces or surface damage, applicable to both ferromagnetic and non-ferromagnetic structures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If electromagnetic forces with very short duration are used to remove dents, then the dent removal process is quick, but the internal stresses in the structure are not eliminated

Engineering Contradiction:

Improvedent removal speedVSAvoidstress elimination completeness

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies periodic electromagnetic pulses with specific rise times (0.08-1.6 ms for first pulse, 10-40 μs for second pulse) to progressively eliminate dents while addressing internal stresses. The periodic nature of the pulses allows cumulative stress relief while maintaining quick processing

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes the temporal parameters of electromagnetic pulses (rise time, duration, polarity) to optimize both dent removal speed and stress elimination. By adjusting the rise time to specific ranges and using bipolar pulses, the system achieves effective stress elimination without sacrificing productivity

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If adhesive or welding methods are used to remove dents, then the dent can be pulled back into position, but the process becomes time-consuming and costly

Engineering Contradiction:

Improvedent restoration accuracyVSAvoidrepair time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent replaces mechanical adhesive or welding systems with an electromagnetic field-based system. The electromagnetic forces directly act on the conductive dent material to restore it to its original shape, eliminating the need for adhesives, welding, or mechanical pulling devices that consume time and resources

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If welding is used to remove dents, then the metal sheet can be pulled back into position, but the paintwork is damaged and repainting is required

Engineering Contradiction:

Improvestructural restorationVSAvoidsurface damage

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent substitutes welding operations with non-contact electromagnetic field application. The electromagnetic pulses restore the dent without generating heat or mechanical contact that would damage the paintwork, thereby eliminating the need for repainting while maintaining structural integrity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 flexible and efficient dent removal without mechanical force, preserving the surface and effectively relieving internal stresses, enabling quick and cost-effective repair of dents on various conductive materials, including vehicle bodies.

Implementation Method 1

at least one magnetic field generator (6) with at least one electrical generator (8), which has at least one induction coil (10) for generating a structure (4) energized at least in the region of the dent (2) penetrating electromagnetic field

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

If the electrically conductive dent (2) is permeated by the electromagnetic field, electrical currents are generated in it, which lead to heating of the structure in the area of the dent

Methodology Applied

Scientific EffectEddy currents: Eddy Currents

Implementation Method 3

The heat generated by the electromagnetic field in the electrical conductor in the area of the dent therefore causes, on the one hand, a reduction in the internal stresses generated by the cold deformation, but at the same time also an expansion of the material in the plane of the structure

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentEP2085161B1Method and device for removing dents from an electrically conductive, flat structure in order to create a smooth structure

Publication Date: 2010.06.02 MAZAC KAREL

Figure 1~3
Figure 4

AI summary

The method involves suspending an electrically conducting, laminar structure (4) to an electromagnetic field in such a manner that structure is heated within the area of the dents (2) and electromagnetic force is practiced by the electromagnetic field on the dents to cause a deformation of the dents over the smooth condition of the structure. The electromagnetic field is repealed for the cooling and relaxation of the structure within the area of the dents. A magnetic field producer (6) is consulted with an electrical generator (8) for the production of electromagnetic field. An independent claim is included for a device for removing dents from an electrically conducting, laminar structure.