Fiber-Reinforced Composite Surface Graining for Shape Formability
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Solution Overview
Problem
Current methods for producing fiber-reinforced composite materials with thermoplastic resins struggle to achieve a balance between lightweight, high-strength, and excellent surface appearance, particularly in complex shapes, due to limitations in shape formability, corrosion resistance, and productivity.
Innovation Solution
A method involving a random mat of reinforcing fibers with a specific fiber length and volume fraction, combined with a thermoplastic resin, where the fibers are processed to form a prepreg and molded using a graining mold with controlled temperature and pressure, resulting in a product with a critical number of reinforcing fiber bundles and a surface texture that enhances both mechanical properties and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fiber-reinforced composite material with continuous fiber is used to achieve high strength and rigidity, then strength and rigidity are improved, but shape formability deteriorates making it difficult to mold complicated shapes
Solution Approach 1:
The continuous fiber is segmented into discontinuous fibers with specific length (1/10 to 10 times the product thickness). This segmentation allows the fibers to be freely disposed in the molded body, enabling complicated shapes to be molded while maintaining sufficient strength and rigidity through the distributed fiber reinforcement.
Solution Approach 2:
The fiber length parameter is specifically controlled to be within a certain range (1/10 to 10 times the product thickness). This parameter optimization enables the material to achieve both good moldability for complicated shapes and sufficient mechanical properties, resolving the contradiction between strength and shape formability.
2Shape
If fiber-reinforced composite material with short fiber is used to achieve good moldability and flexibility in shape, then shape formability is improved, but strength and rigidity deteriorate
Solution Approach 1:
The fiber length is optimized to a specific range (1/10 to 10 times the product thickness), which is longer than conventional short fibers but shorter than continuous fibers. This parameter change enables the material to achieve both good moldability for complicated shapes and sufficient mechanical properties, resolving the contradiction between shape formability and strength.
3Strength
If metal alloy (aluminum or magnesium) is used to achieve high strength and rigidity, then strength and rigidity are improved, but corrosion resistance deteriorates causing surface corrosion
Solution Approach 1:
The invention uses fiber-reinforced composite material consisting of reinforcing fibers (glass, carbon, or other inorganic/organic fibers) and thermoplastic resin. This composite material provides both high strength and rigidity comparable to metal alloys, while inherently possessing excellent corrosion resistance that prevents surface corrosion from moisture and salts.
4Weight of moving object
If fiber-reinforced composite material is used to achieve lightweight and high strength, then weight is reduced and strength is improved, but surface appearance deteriorates due to short fiber length
Solution Approach 1:
The fiber length is specifically controlled to be within a certain range (1/10 to 10 times the product thickness), which is sufficiently long to provide good surface appearance while maintaining the lightweight advantage of fiber-reinforced composites. This parameter optimization resolves the contradiction between weight reduction and surface appearance quality.
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
The method enables the production of fiber-reinforced composite materials with improved strength, rigidity, and surface appearance, suitable for various applications, including electronics and automotive parts, while maintaining isotropic properties and reducing production time.
Implementation Method 1
a shaped product made of a fiber-reinforced composite material including reinforcing fibers and a thermoplastic resin
Implementation Method 2
molded using a graining mold with controlled temperature and pressure
Data Source
AI summary
There is provided a shaped product made of a fiber-reinforced composite material including reinforcing fibers having an average length of 5 mm or more and 100 mm or less and a thermoplastic resin, in which a volume fraction of reinforcing fibers (Vf=100×volume of reinforcing fibers/(volume of reinforcing fibers+volume of thermoplastic resin)) is 5 to 80%, grains are formed on a surface of the shaped product, and a ratio of a reinforcing fiber bundle (A) including the reinforcing fibers of a critical number of single fiber or more, the critical number defined by Formula (1), to the total amount of the reinforcing fibers is 20 Vol % or more and 99 Vol % or less:Critical number of single fiber=600/D (1)(wherein D is an average fiber diameter (μm) of single reinforcing fiber).