Cutting Uncured Prepregs for Composite Molding Precision
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Solution Overview
Problem
Current methods for producing fiber-reinforced composite members are costly and result in poor cut surfaces due to tool wear and limited design freedom, with existing solutions requiring specialized tools and being limited to specific lamination structures.
Innovation Solution
The method involves cutting excess margins from prepregs in a molding die cavity and curing the matrix resin, using a molding die with aligned holes for forming connecting holes and a flat-tip tool for easy removal, ensuring accurate and cost-effective production of fiber-reinforced composite members with improved cut surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cutting is performed on cured prepreg moldings to secure high dimensional accuracy, then manufacturing precision is improved, but cutting tool wear increases and tool life decreases
Solution Approach 1:
The invention performs the cutting action on the prepreg material before curing, when the material is still in a soft, uncured state. This preliminary cutting action eliminates the need for subsequent cutting of cured material, thereby preventing cutting tool wear and extending tool life while maintaining dimensional accuracy through the molding process itself
2Ease of manufacture
If conventional cutting tools are used on fiber-reinforced composites, then cutting can be performed, but fiber fluff and interlaminar peeling occur on the cut surface
Solution Approach 1:
The cutting operation is performed on the uncured prepreg material before it is cured in the mold. Since the material is soft and pliable at this stage, cutting can be done easily without generating fiber fluff or causing interlaminar peeling. The final cut surface quality is then achieved through the molding process that cures the material in its final shape
3Manufacturing precision
If specialized cutting tools with diamond particles or vibration mechanisms are used, then cut surface quality is improved, but device complexity and cost increase
Solution Approach 1:
The invention performs cutting on the uncured prepreg material before molding, when the material is soft and easy to cut with conventional tools. This eliminates the need for specialized cutting tools with diamond particles or vibration mechanisms, thereby reducing device complexity and cost while still achieving good cut surface quality through the subsequent molding process
4Manufacturing precision
If excess margins are cut from cured prepreg moldings, then dimensional accuracy is improved, but manufacturing cost increases due to specialized tools
Solution Approach 1:
The excess margins are cut from the prepreg material before curing, when the material is soft and can be cut with conventional, low-cost tools. The dimensional accuracy is then achieved through the molding process that cures the material in its final shape, eliminating the need for expensive specialized cutting tools while maintaining high dimensional precision
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 allows for the accurate and cost-effective production of fiber-reinforced composite members with better cut surfaces and increased design freedom, reducing tool wear and the need for specialized tools.
Implementation Method 1
the dimension of the fiber-reinforced composite member at a curing temperature of the prepregs is calculated from the designed dimension of the fiber-reinforced composite member at room temperature, using the linear thermal expansion coefficient of the fiber-reinforced composite member
Implementation Method 2
the dimension of the cavity of the molding die at room temperature is calculated using the linear thermal expansion coefficient of the molding die, such that it becomes equal to the dimension of the fiber-reinforced composite member at the curing temperature
Data Source
AI summary
A method for producing a fiber-reinforced composite member from prepregs of reinforcing fibers impregnated with a matrix resin, comprising placing the prepregs in a cavity of a molding die, cutting off excess margins of the prepregs along the edges of the cavity, and curing the matrix resin.