Cutting Fiber-Reinforced Resin by Heating Below Glass Transition
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Solution Overview
Problem
Current methods for cutting fiber-reinforced resin materials, particularly those with thermoplastic resins, face challenges such as reduced blade durability and increased cost and time due to high cutting resistance and thermal conductivity issues, leading to inefficient production and potential blade breakage.
Innovation Solution
A method that decreases the flexural modulus of the fiber-reinforced resin material by heating it to specific temperatures below its melting or glass transition point, allowing for efficient cutting with reduced blade wear and continuous production, using techniques like infrared heating and maintaining a constant temperature during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the fiber-reinforced resin material is cut without heating, then the cutting resistance is high and blade durability is reduced, but heating the material increases thermal conductivity issues and causes excessive heating of the periphery
Solution Approach 1:
The resin material is heated to a temperature below its melting or glass transition point before cutting to reduce the flexural modulus and cutting resistance. This preliminary heating action softens the material just enough to improve blade durability while controlling the temperature to avoid excessive peripheral heating and carbonization of fibers.
Solution Approach 2:
The invention changes the temperature parameter of the resin material to a specific range below the melting or glass transition point. This parameter change reduces the flexural modulus and cutting resistance, improving blade durability while preventing excessive heating and thermal damage to the fiber-reinforced structure.
2Ease of manufacture
If the flexural modulus is not decreased before cutting, then the cutting resistance is high and processing is difficult, but decreasing the flexural modulus requires heating which increases cost and processing time
Solution Approach 1:
The invention optimizes the heating temperature parameter to be below the melting or glass transition point of the resin, which is sufficient to decrease the flexural modulus and improve cutting ease. This optimized parameter change achieves the desired cutting performance while minimizing the heating time and energy consumption.
Solution Approach 2:
The heating is applied locally to the cutting zone or the entire material surface uniformly at a controlled temperature, creating the necessary softening effect only where needed for cutting. This localized quality change improves cutting ease without requiring excessive heating time throughout the entire material.
3Duration of action of stationary object
If carbon steel is used for the Thomson blade and hardness is increased by quenching, then durability is improved, but workability deteriorates and it becomes difficult to make the blade large or various shapes
Solution Approach 1:
Instead of modifying the blade properties, the invention applies preliminary heating to the resin material to reduce its flexural modulus and cutting resistance. This preliminary action on the workpiece rather than the tool allows maintaining blade workability and manufacturability while still improving durability through reduced cutting forces.
Solution Approach 2:
The invention replaces the mechanical approach of increasing blade hardness through quenching with a thermal approach of heating the resin material to reduce its mechanical properties temporarily. This substitution avoids the workability issues of quenched steel blades while achieving similar durability improvements through reduced cutting resistance.
4Reliability
If high-pressure water jet or laser cutting is used instead of processing blades, then blade durability issues are avoided, but cost and processing time increase making mass production difficult
Solution Approach 1:
The invention substitutes the problematic mechanical cutting process with a combined thermal-mechanical process where heating reduces the resin's flexural modulus, allowing standard mechanical blades to cut efficiently. This substitution maintains the advantages of mechanical cutting for mass production while avoiding blade durability issues through thermal softening of the material.
Solution Approach 2:
By changing the temperature parameter of the resin material to below its melting or glass transition point, the invention reduces the flexural modulus and cutting resistance. This parameter change enables standard mechanical cutting tools to achieve reliable cutting performance, combining the reliability of controlled thermal processing with the productivity of mechanical cutting for mass production.
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 significantly extends the life of cutting blades and enables continuous cutting of fiber-reinforced resin materials with improved surface quality and reduced burr generation, making mass production more feasible and cost-effective.
Implementation Method 1
heating it to specific temperatures below its melting or glass transition point
Implementation Method 2
heating it to specific temperatures below its melting or glass transition point
Implementation Method 3
using techniques like infrared heating
Data Source
AI summary
According to an aspect of the present invention, there is provided a method for producing cut bodies including: cutting a fiber-reinforced resin material, the fiber-reinforced resin material including reinforcing fibers and a thermoplastic resin, the reinforcing fibers having a tensile strength of 1,000 MPa to 6,000 MPa; and heating the fiber-reinforced resin material, wherein a flexural modulus of the fiber-reinforced resin material at the cutting is decreased to a value ranging from 80% to 15% of the flexural modulus of the fiber-reinforced resin material before heating.