Overmolding Extruded Profiles for Baffle Formation
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Solution Overview
Problem
Existing methods for forming baffles with thermally expandable materials for acoustic dampening and structural reinforcement in automotive and aerospace applications are hindered by high tooling costs, material shrinkage, lack of support, sagging, and excessive scrap production, limiting the ability to create complex shapes and recycle materials effectively.
Innovation Solution
The process involves extruding an expandable material with a specific cross-sectional profile, inserting it into a molding tool, shaping it, and overmolding a carrier material within the tool, which minimizes tool investment and waste, allowing for complex shapes and reduced scrap production by cutting the expandable material to precise lengths within the tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional overmolding or assembly techniques are used to form baffles, then baffles can be produced with carrier and expandable material, but high tooling costs and material shrinkage occur
Solution Approach 1:
The expandable material is pre-formed into a sheet with cavities before being placed in the molding tool. This preliminary formation allows precise control of material quantity and reduces shrinkage during the final overmolding process, as the material structure is already established.
Solution Approach 2:
The patent combines the extrusion of the expandable material sheet and the overmolding of the carrier material into a single integrated process step. The expandable material is extruded with cavities already formed, then the carrier is overmolded in one continuous operation, eliminating separate assembly steps and reducing material loss.
2Reliability
If baffles are formed using conventional methods, then acoustic dampening and sealing functions are achieved, but lack of support and sagging occur
Solution Approach 1:
The patent uses a composite structure combining an expandable material sheet with cavities for acoustic dampening and a carrier material for structural support. The carrier is overmolded onto the expandable material, creating a composite baffle that provides both acoustic function and structural integrity to prevent sagging.
Solution Approach 2:
The expandable material is placed in specific cavities within the carrier structure at strategic locations. This localized placement provides acoustic dampening exactly where needed while maintaining overall structural support from the carrier material, preventing sagging in critical areas.
3Reliability
If complex baffle shapes are required, then acoustic and sealing requirements are met, but excessive scrap production and difficulty in recycling occur
Solution Approach 1:
The baffle is designed as a modular composite structure with the expandable material sheet containing multiple cavities that can be independently configured. This segmentation allows complex shapes to be achieved by arranging cavities in specific patterns rather than creating complex monolithic structures, reducing scrap and improving recyclability.
Solution Approach 2:
The patent changes the geometric parameters of the expandable material by creating cavities with specific shapes, sizes, and distributions within the sheet. These parameter variations allow the baffle to meet complex acoustic and sealing requirements while maintaining a manufacturable structure that minimizes scrap production.
4Reliability
If multiple production steps are used to create baffles, then carrier and expandable material can be assembled, but high tooling investment and process complexity increase
Solution Approach 1:
The patent merges the extrusion of the expandable material sheet and the overmolding of the carrier into a single integrated process step. The expandable material is extruded with cavities already formed, then the carrier is overmolded onto it in one continuous operation, eliminating separate assembly steps and reducing tooling complexity.
Solution Approach 2:
The expandable material sheet with cavities is pre-formed through extrusion before the overmolding step. This preliminary action prepares the material in advance with the correct structure, allowing the final assembly to be completed in a single overmolding operation rather than requiring multiple separate steps.
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 produces baffles that meet acoustic, sealing, and structural requirements with reduced waste and tool investment, enabling the creation of custom shapes without producing scrap material, thus improving efficiency and recyclability.
Implementation Method 1
by the action of the heat applied in electrophoresis baking, the baffle material expands to seal the cavity and or bond the carrier to the member
Data Source
AI summary
An exemplary method of, for instance, forming a baffle or reinforcer includes extruding an expandable material to have a particular cross-sectional profile, inserting the expandable material into a molding tool, cutting the expandable material to a predetermined length within the molding tool, and overmolding a carrier material onto a portion of the expandable material within the molding tool.