Thermoplastic Composite Molding Biasing System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacturing of thermoplastic composite parts using continuous compression molding results in reduced structural integrity and geometric consistency due to residual stresses, particularly at corner radii, leading to spring back issues and fit problems with other components.
Innovation Solution
A continuous compression molding machine with a tooling die and tooling sleeve system, equipped with a biasing system that adjusts the angle of the thermoplastic composite charge from a first angle in the heating zone to a second angle in the cooling zone, reducing residual stresses and improving structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flanges are held open to a constant angle of 92 degrees to compensate for spring back, then the desired final angle of 90 degrees is achieved, but the structural integrity is reduced due to residual stresses at corner radii
Solution Approach 1:
The biasing system applies a preliminary counteracting force during the molding process to offset the anticipated spring back effect. By holding the flanges at a compensated angle (e.g., 92 degrees) during forming, the part springs back to the desired final angle (90 degrees) after removal, while the gradual angle transition minimizes residual stress concentration
Solution Approach 2:
The biasing system dynamically adjusts the flange angle throughout the process zones, transitioning from a first angle in the heating zone to a second angle in the cooling zone. This dynamic adjustment allows the system to adapt to changing material properties during cooling, reducing residual stresses while maintaining geometric precision
2Device complexity
If the flanges are held at a constant angle during the entire process, then the manufacturing process is simple, but the geometric consistency is reduced leading to fit problems
Solution Approach 1:
The tooling is divided into multiple process zones (heating zone and cooling zone) with distinct biasing requirements. Each zone has its own biasing mechanism that can be independently controlled, allowing for optimized angle management in each zone while maintaining overall system manageability
Solution Approach 2:
The biasing system changes the holding angle parameter from a first angle in the heating zone to a second angle in the cooling zone. This parameter change adapts to the material's changing properties during cooling, ensuring geometric consistency while avoiding the need for overly complex constant-angle mechanisms
3Strength
If a biasing system adjusts the angle from a first angle in the heating zone to a second angle in the cooling zone, then the structural integrity and geometric consistency are improved, but the device complexity increases
Solution Approach 1:
The biasing system is integrated with the existing tooling die and sleeve structure, combining the angle control function with the molding mechanism. This merging approach achieves improved structural integrity and geometric consistency while minimizing additional device complexity by utilizing the existing tooling framework
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 approach enhances the structural integrity and geometric consistency of thermoplastic composite parts by managing spring back, resulting in improved fit and reduced maintenance needs.
Implementation Method 1
a tooling die, extending through a heating zone and a cooling zone
Implementation Method 2
a tooling die, extending through a heating zone and a cooling zone
Data Source
AI summary
A method and apparatus for a continuous compression molding machine. The continuous compression molding machine comprises a tooling die, extending through a heating zone and a cooling zone, a tooling sleeve, and a biasing system. The tooling sleeve corresponds to the tooling die and is for use in forming a thermoplastic composite part from a thermoplastic composite charge when the tooling sleeve with the thermoplastic composite charge is moved with respect to the tooling die through the heating zone and the cooling zone. The biasing system is configured to hold the thermoplastic charge at a first angle within the heating zone and hold the thermoplastic composite charge at a second angle within the cooling zone, as the tooling sleeve moves through the heating zone and the cooling zone with the thermoplastic composite charge. The first angle is different from the second angle.