Hollow Thermoplastic Ball Core Molding for Complex Sandwich Geometries
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Solution Overview
Problem
Manufacturing sandwich-structured composites with complex geometries is challenging due to potential defects like delamination, and existing methods are complex and prone to errors.
Innovation Solution
A method and apparatus for forming hollow ball cores in sandwich structured composites involves inserting thermoplastic components into a mold, adhering them to the inner wall with an adhesive, applying pressure and heat to form connected sheets, and optionally using gas pressure or a bladder to compress and shape the components, allowing for the removal of excess components and adhesive evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional methods are used to manufacture sandwich-structured composites with complex geometries, then the manufacturing process is complex and prone to errors, but the manufacturing precision and reliability deteriorate due to potential defects like delamination
Solution Approach 1:
The invention uses discrete hollow thermoplastic components as core elements that are individually placed into the mold cavity. These segmented components form the sandwich structure core, allowing for complex geometries while maintaining manufacturing simplicity and reducing delamination risks through their inherent structural integrity
Solution Approach 2:
The invention changes the physical state of the thermoplastic material by heating it to a forming temperature, which allows the material to become pliable and conform to the mold cavity shape. This parameter change enables complex geometry formation while maintaining process simplicity and reducing manufacturing defects
2Strength
If pressure and heat are applied to form connected sheets from thermoplastic components, then the structural integrity improves, but the manufacturing complexity increases
Solution Approach 1:
The invention combines multiple functions into a single mold assembly: the mold serves as both the heating element (through integrated heating zones) and the pressure application device (through platen closure). This merging reduces device complexity while achieving the necessary structural integrity through connected sheet formation
Solution Approach 2:
The mold assembly is designed with multi-functionality, serving as a container for hollow components, a heating device, and a pressure application mechanism all in one structure. This universal design improves structural integrity without proportionally increasing device complexity
3Manufacturing precision
If adhesive material is used to adhere thermoplastic components to the mold inner wall, then the manufacturing precision improves, but the manufacturing time increases due to adhesive application and evaporation
Solution Approach 1:
The adhesive material is applied to the mold inner wall before the hollow thermoplastic components are inserted. This preliminary action ensures precise component positioning from the start, and the subsequent heating process simultaneously cures the adhesive, reducing total processing time by combining positioning and bonding steps
4Adaptability or versatility
If gas pressure or bladder is used to compress thermoplastic components, then the adaptability to complex geometries improves, but the device complexity increases
Solution Approach 1:
The invention uses gas pressure (pneumatics) to compress the hollow thermoplastic components during the molding process. This pneumatic compression system provides uniform pressure distribution that adapts to complex geometries while maintaining relatively simple device architecture compared to mechanical compression systems
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 process simplifies the manufacturing of sandwich-structured composites with complex geometries, reducing defects and enhancing the manufacturing efficiency.
Implementation Method 1
inserting a plurality of thermoplastic components into a mold such that at least two or more thermoplastic components of the plurality of thermoplastic components are adhered to the inner wall of the mold via the adhesive material
Implementation Method 2
heating the plurality of thermoplastic components concurrently with applying the pressure such that a first portion of the thermoplastic material of the thermoplastic components forms a first sheet on a first side of the plurality of thermoplastic components
Implementation Method 3
applying pressure onto the two or more thermoplastic components adhered to the inner wall in a direction towards the inner wall of the mold to compress the plurality of thermoplastic components
Implementation Method 4
heating the plurality of thermoplastic components concurrently with applying the pressure such that the adhesive at least partially evaporates
Data Source
AI summary
A method of the present disclosure includes inserting thermoplastic components into a mold such that at least two or more thermoplastic components are adhered to an inner wall of the mold. The thermoplastic components are substantially hollow and made of a thermoplastic material. The method includes applying pressure onto the thermoplastic components adhered to the inner wall in a direction towards the inner wall of the mold to compress the thermoplastic components. The method includes heating the thermoplastic components concurrently with applying the pressure such that a first portion of the thermoplastic material of the thermoplastic components forms a first sheet on a first side of the thermoplastic components and a second portion of the thermoplastic material of the thermoplastic components forms a second sheet on a second side of the thermoplastic components opposite to the first side. The first sheet connects the plurality of thermoplastic components.