Heated Stylus Incremental Forming for Composite and High-Strength Sheets
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Solution Overview
Problem
Current incremental forming processes face challenges in forming fiber reinforced plastics and advanced high strength metals due to material brittleness and difficulty in consolidating composite sheets, which leads to fiber misalignment and reduced formability.
Innovation Solution
A heated stylus tool with a rotatable bearing and temperature control is used in incremental forming machines to apply temperature and pressure, minimizing surface strains and allowing for the formation of composite sheets and metals by locally liquefying resin and applying tailored heat treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If rigid stylus tools are used to form composite sheets, then the material can be shaped, but the reinforcement fibers are torn and move out of position
Solution Approach 1:
The patent applies heating to change the physical state and properties of the composite material. By heating the composite sheet before forming, the resin matrix becomes softer and more pliable, allowing the reinforcement fibers to be shaped without tearing or displacing. This parameter change (temperature) enables formability while preserving fiber alignment.
Solution Approach 2:
The patent replaces the purely mechanical rigid stylus tool with a heated stylus tool that combines thermal energy with mechanical forming. The heating element integrated into the stylus transfers thermal energy to the composite material, substituting cold mechanical force with warm mechanical force that is gentler on the fiber structure.
2Ease of manufacture
If advanced high strength metals are formed at room temperature, then the process is simple, but the metals are too brittle to be formed
Solution Approach 1:
The patent changes the temperature parameter of the metal blank from room temperature to elevated temperature during the forming process. This parameter change transforms the metal from a brittle state to a more ductile state, enabling complex shapes to be formed without cracking or failure. The heated stylus provides localized heating to achieve the necessary temperature for improved ductility.
3Device complexity
If SMC sheets are formed without support, then the process is simpler, but the material must be supported as it flows and molds
Solution Approach 1:
The patent uses heating to change the rheological properties of the SMC sheet material. By applying heat, the resin matrix becomes softer and more flowable, allowing the material to self-support and flow into the desired shape without requiring additional support structures. The thermal energy enables the material to maintain its form during the molding process.
4Ease of manufacture
If conventional incremental forming is used for high strength metals, then production cost is reduced, but post-forming heat treating is required
Solution Approach 1:
The patent merges the forming operation with the heat treatment operation by using a heated stylus tool. The thermal energy applied during forming simultaneously achieves both shape transformation and the necessary heat treatment for high strength metals. This consolidation eliminates the need for separate post-forming heat treating steps, reducing both cost and production time.
Solution Approach 2:
The patent performs the heat treatment action during the forming process itself rather than as a subsequent separate operation. By pre-heating the material and maintaining elevated temperature during forming, the necessary thermal processing is completed in advance, eliminating the need for later heat treatment steps.
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 heated stylus enables the formation of fiber reinforced plastics and advanced high strength metals with reduced fiber misalignment and improved formability, allowing for high-speed prototyping and tailored material properties without post-forming processing.
Implementation Method 1
The heating element on the stylus heats the tip to a predetermined temperature
Implementation Method 2
heated by a resistance heating element or an induction heating coil
Implementation Method 3
The resin penetrating the uncoated fibers cures in place upon cooling to form the FRP prototype part
Implementation Method 4
The heated stylus allows the composite blank or fabric to be softer at the location being formed
Implementation Method 5
The resin penetrating the uncoated fibers cures in place upon cooling to form the FRP prototype part
Implementation Method 6
consolidated by applying temperature and pressure with the stylus
Implementation Method 7
A rotatable bearing on a stylus tip may be used to minimize distortion of the fabric while creating a desired shape, and reduce frictional forces from the forming process
Data Source
AI summary
An incremental forming machine and a process are disclosed that comprise selecting a blank and selecting a stylus that has a tip at one end. The stylus may be heated to a desired temperature before contacting the blank with the stylus to change a characteristic of the blank or part. The stylus apparatus may include a tip on an end of a shaft and a resistance heating element disposed inside the tip. Alternatively, the stylus apparatus may include an induction heating coil disposed around the tip. The tip of the stylus may have a rotatable ball that engages the blank or part.