Plastic Body Panel Groove Design for Flush Painted Flaps
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Solution Overview
Problem
Current methods for producing vehicle body parts with movable flaps are complex and costly, as they require separate production of plastic panels and flaps, leading to issues with color harmony and excess paint, necessitating additional reworking steps that increase time and expense.
Innovation Solution
A method involving molding a plastic panel with a groove having rounded upper edges, allowing laser cutting that preserves the decorating coating and eliminates the need for repainting, while optimizing flushness and aerodynamics by using a non-vertical cutting plane and a projecting portion for the flap, ensuring a seamless paint finish and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate production of plastic panels and flaps is used, then manufacturing flexibility is maintained, but production complexity and costs increase
Solution Approach 1:
The patent combines the panel and flap into a single integrated plastic body part that is molded as one piece. The flap is formed as an integral part of the panel through a single molding process, eliminating the need for separate production, assembly, and alignment operations. This merging resolves the contradiction by maintaining manufacturing simplicity while reducing production complexity.
2Ease of manufacture
If separate production of plastic panels and flaps is used, then manufacturing flexibility is maintained, but production costs increase
Solution Approach 1:
The integrated design allows the panel and flap to be produced in a single molding cycle, eliminating multiple production steps, assembly operations, and quality control checks. This reduces labor costs, material waste, and production time, thereby resolving the contradiction by maintaining ease of manufacture while reducing production costs.
3Manufacturing precision
If painting is performed before laser cutting, then color harmony is achieved, but paint damage occurs during cutting
Solution Approach 1:
The patent incorporates rounding of the flap edges as a preliminary action during the molding process, before painting and laser cutting occur. This pre-formed rounded geometry protects the paint surface during subsequent laser cutting, eliminating paint damage while maintaining color harmony. The preliminary shaping action prevents the harmful effect of paint damage.
4Device complexity
If sharp edges are used on the groove, then manufacturing simplicity is maintained, but excess paint and unsightly appearance result
Solution Approach 1:
The patent applies curvature by rounding the upper edges of the groove and flap surfaces. This rounded geometry prevents paint accumulation and eliminates sharp edges that would create unsightly excess paint during cutting. The curvilinear design maintains manufacturing simplicity while significantly improving paint finish quality and aesthetic appearance.
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 enables cost-effective and efficient production of vehicle body parts with integrated flaps, maintaining color harmony and eliminating the need for additional reworking steps, resulting in a flush and aesthetically pleasing finish that meets manufacturer specifications.
Implementation Method 1
laser cutting of the plastic panel at the bottom of the groove while preserving the rounded profile of said upper edges
Data Source
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AI summary
Method for producing a plastic body part (1) for motor vehicles comprising the following steps: - molding of a plastic panel (2) having a first face (21) and a second face (22) opposed to the first face (21), the plastic panel (2) comprising a groove (12) having rounded upper edges (13) on the first face (21) and deliming a surface of the first face (21), - laser cutting of the plastic panel (2) at the bottom of the groove (12).