Vehicle Bodywork Bonding via Inverted Thermal Conduction

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Solution Overview

Problem

Conventional bonding methods for vehicle body elements face challenges in heating inaccessible areas of structural parts without affecting the appearance part, leading to design constraints and inefficient energy use.

Innovation Solution

A method involving preheating the area to be glued on the structural part using a heating element, applying glue to the appearance part, and then pressing them together without additional heating, allowing for efficient heating of previously inaccessible areas and reducing energy consumption and part deformation risks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If heating is carried out on the unbonded side of the structural part to preserve the appearance part, then the aesthetic quality is maintained, but inaccessible areas cannot be heated and design constraints are imposed

Engineering Contradiction:

Improveaesthetic qualityVSAvoidheating accessibility

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent inverts the conventional heating approach by heating the bonded side (aesthetic part) instead of the unbonded side. The adhesive layer acts as a thermal insulator, protecting the appearance part from excessive heat while allowing the structural part to be heated through the adhesive from the opposite side. This resolves the contradiction by maintaining aesthetic quality while enabling heating of previously inaccessible areas.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The adhesive layer serves as a thermal intermediary that mediates heat transfer between the heating element and the structural part. It allows controlled heating of the structural part while protecting the appearance part, thus enabling heating of inaccessible areas without compromising aesthetic quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If heating elements are positioned to avoid the appearance part, then aesthetic quality is preserved, but heating efficiency decreases and expansion problems occur

Engineering Contradiction:

Improveaesthetic qualityVSAvoidheating efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent inverts the heating direction by applying heat from the bonded side through the adhesive layer. This allows the heating element to be positioned close to or even in contact with the appearance part without causing aesthetic degradation, thereby improving heating efficiency while preserving aesthetic quality.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the thermal parameters by controlling the temperature and duration of heating when applied from the bonded side. The adhesive layer's thermal properties are utilized to modulate heat transfer, enabling efficient heating of the structural part while maintaining aesthetic quality of the appearance part.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If conventional heating methods are used on the unbonded side, then the process is simple, but bonding speed decreases and energy consumption increases

Engineering Contradiction:

Improveprocess simplicityVSAvoidbonding speed

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent applies preliminary heating to the structural part through the adhesive layer before adhesive application and bonding. This preheating action accelerates subsequent adhesive curing and bonding speed, improving productivity while maintaining process simplicity through the same heating element configuration.

Inventive Principle:

Principle #10Preliminary action

4Productivity

If heating is applied to accelerate adhesive curing, then bonding speed increases, but risk of part deformation increases

Engineering Contradiction:

Improvebonding speedVSAvoidpart deformation

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies heating locally to the bonding area through the adhesive layer, concentrating thermal energy where needed for adhesive curing. This localized heating accelerates bonding speed while minimizing thermal exposure to other parts of the assembly, reducing the risk of deformation and maintaining manufacturing precision.

Inventive Principle:

Principle #3Local quality

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 faster, more energy-efficient bonding with reduced risk of part deformation, accommodating various geometries and materials, and allowing for effective crosslinking of the glue at lower temperatures.

Implementation Method 1

Heat an area to be glued on the structural part using a heating element

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

the structural part, heated by the adhesive, at a temperature between 70°C and 100°C

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP3812247B1Method for gluing a body part of a vehicle

Publication Date: 2024.03.06 OPMOBILITY SE

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Figure 4

AI summary

The invention relates to a method for bonding a vehicle bodywork element (10) comprising an appearance part (2) and a structural part (3) comprising the following steps: - Step 1: a bonding area (31) on the structural part (3) is heated by means of a heating element (4), - Step 2: a quantity of glue is deposited on the bonding area (31), - Step 3: the appearance part (2) is placed on the structural part (3), - Step 4: the appearance part (2) is pressed against the structural part (3).