Fiber Bundle Placement Head Force Control for Narrow Die Contact
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Solution Overview
Problem
Automated fiber bundle placement apparatuses face issues with deformation of the pressing part when the placement die has a smaller width dimension than the pressing part, leading to improper pressing of fiber bundles and potential wrinkles, especially when the die surface is curved, causing reactive forces to vary across the width direction.
Innovation Solution
The apparatus includes a drive control device that outputs a drive command corresponding to the contact width of the placement die, allowing the pressing force to be adjusted accordingly, reducing deformation and ensuring consistent pressing across the width dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a predetermined pressing force is applied to the pressing part regardless of contact width, then the pressing mechanism is simple to control, but the pressing part deforms when the placement die width is smaller than the pressing part width
Solution Approach 1:
The pressing force is made dynamically adjustable based on the contact width between the pressing part and placement die. The drive control device changes the pressing force according to the actual contact width, transforming a static fixed-force system into a dynamic adaptive system that prevents pressing part deformation while maintaining simple mechanism structure.
Solution Approach 2:
The pressing force parameter is changed based on the contact width measurement. When the contact width is smaller than the pressing part width, the pressing force is reduced to prevent deformation. This parameter adjustment resolves the contradiction between simple control and manufacturing precision.
2Adaptability or versatility
If the placement die width is smaller than the pressing part width, then the placement die can accommodate various fiber bundle widths, but the pressing part deforms and causes wrinkles in the fiber bundle
Solution Approach 1:
The pressing force is locally adjusted according to the actual contact width. When the placement die width is smaller than the pressing part width, the pressing force is reduced only in the contact region, preventing deformation and wrinkles while maintaining the ability to accommodate various fiber bundle widths through the same pressing part.
Solution Approach 2:
The drive control device uses feedback from the contact width measurement to adjust the pressing force. This feedback mechanism ensures that the pressing force is optimized for each specific placement die width, preventing deformation and maintaining placement quality while preserving adaptability to different die sizes.
3Adaptability or versatility
If the placement surface is a curved surface, then the pressing part can conform to complex geometries, but the reactive force varies across the width direction causing increased deformation
Solution Approach 1:
The pressing force is dynamically adjusted based on the contact width measurement, which varies when placing on curved surfaces. This dynamic control compensates for the varying reactive forces across the width direction, preventing excessive deformation while maintaining the ability to conform to complex curved geometries.
Data Source
AI summary
An automated fiber bundle placement apparatus including a placing head having a pressing device, and a multi-jointed robot. The pressing device includes a pressing part, a pressing mechanism having a drive device, and a drive control device. The drive control device includes a drive command unit configured to output a drive command corresponding to a contact width of a placement die with the pressing part, the contact width being a length in the width direction of a part of the placement die facing in parallel to a contact range of the pressing part during pressing against the placement die, and is configured to control drive of the drive device to apply a pressing force corresponding to the drive command to the pressing part.