Circular Needling Table Guide Means for Fiber Preform Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Circular needling tables face challenges in accurately positioning the first layer of a floppy fiber preform under the needling head, leading to discontinuous edges and material creep in the resulting textile structure.
Innovation Solution
Incorporation of guide means, such as pins or vertical walls, to accurately guide the fiber preform under the needling head, ensuring proper alignment and positioning of subsequent layers, thereby preventing material creep and achieving clean edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If drive means are used to rotate the fiber preform, then the fiber preform can be processed continuously, but the first layer is floppy and difficult to position accurately under the needling head
Solution Approach 1:
The guide means (guide pins or guide walls) are positioned in advance on the platen to define the exact path and position where the fiber preform should be placed. This preliminary positioning structure ensures that even the floppy first layer can be accurately guided to the correct position under the needling head before needling begins, resolving the positioning accuracy issue while maintaining continuous processing capability
2Ease of operation
If the fiber preform is not properly aligned under the needling head, then positioning is faster, but the resulting textile structure presents edges that are not properly continuous and clean
Solution Approach 1:
The guide means act as an intermediary element between the fiber preform and the needling head. The guide pins or guide walls physically guide the preform along a defined path, ensuring proper alignment without requiring complex positioning operations. This intermediary structure maintains both ease of operation and high edge quality by automatically ensuring proper alignment
3Device complexity
If the material passes under the needling head without guidance, then the process is simpler, but the material tends to spread out towards the edges (creep phenomenon)
Solution Approach 1:
The guide means provide localized guidance only in the critical areas where the fiber preform needs to be constrained (at the edges and along the path to the needling head). The guide pins or guide walls create localized constraint zones that prevent material creep exactly where needed, while maintaining simplicity elsewhere in the process. This localized approach prevents material spreading without adding excessive complexity
Data Source
AI summary
A circular needling table for needling a textile structure made from an annular fiber preform, the table including: a horizontal annular platen for having the annular fiber preform placed thereon; drive means for driving the fiber preform in rotation about the axis of the platen; a needling device having a needling head extending over an angular sector of the platen and driven in vertical motion relative to the platen; and guide means for guiding the fiber preform under the needling head.