Interrupted Cut Fast Tool Servo for Microstructure Fabrication
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Solution Overview
Problem
Current machining techniques for creating microreplicated structures face challenges in achieving precise and high-speed cutting with varying taper angles, which are essential for producing microstructures with specific dimensions and features such as optical films and mechanical fasteners.
Innovation Solution
A cutting tool system utilizing a PZT stack actuator that allows for precise and high-speed movement of a tool tip in the x-direction, enabling discontinuous contact with the work piece and varying taper-in and taper-out angles, allowing for the creation of microstructures with dimensions ranging from 100 microns to sub-optical wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional machining techniques are used to create microreplicated structures, then manufacturing capability is maintained, but manufacturing precision and speed are insufficient for high-precision microstructures
Solution Approach 1:
The patent applies dynamics by implementing a fast tool servo mechanism that enables dynamic, high-speed adjustment of the tool tip position in the x-direction. This allows the cutting tool to rapidly move into and out of the workpiece, achieving both high cutting speed and precise control of taper angles for microstructure fabrication
Solution Approach 2:
The patent utilizes parameter changes by varying the taper-in and taper-out angles through controlled tool tip movement. The actuator adjusts the tool tip position to create different cutting angles, enabling precise control over microstructure geometry while maintaining high-speed operation
2Adaptability or versatility
If continuous contact cutting is used, then material removal is efficient, but control over taper angles and microstructure features is reduced
Solution Approach 1:
The patent applies periodic action through interrupted cut methodology, where the tool tip periodically enters and exits the workpiece. This periodic contact enables precise control of taper angles by controlling the duration and timing of each contact cycle, creating distinct microstructure features with high adaptability
3Productivity
If high-speed cutting is implemented, then productivity increases, but manufacturing precision of microstructure dimensions decreases
Solution Approach 1:
The patent implements feedback through a controller that receives signals from an encoder and adjusts the actuator accordingly. This closed-loop control system maintains high cutting speed while ensuring precise positioning of the tool tip, achieving both high productivity and manufacturing precision through real-time feedback adjustment
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
Enables the production of microstructures with precise control over dimensions and features, such as optical films and mechanical fasteners, with the ability to create structures that are invisible to the naked eye, reducing the need for diffuser sheets and allowing for deterministic adjustment of feature density and light extraction angles.
Implementation Method 1
A cutting tool system utilizing a PZT stack actuator that allows for precise and high-speed movement of a tool tip in the x-direction
Data Source
AI summary
A cutting tool assembly having a tool post capable of lateral movement along a work piece to be cut and an actuator with a tool tip. The actuator provides for control of the movement of the tool tip in an x-direction into and out of the work piece in order to make discontinuous microstructures in it. The machined work piece can be used to make microstructured articles such as films having non-adjacent lenslets.