Anisotropic Fiber Guide Surface Texture for High-Speed Sliding
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Solution Overview
Problem
Fiber guides currently fail to minimize damage and fraying of fibers at high feed rates due to issues with surface roughness, leading to angled or invariable sliding, which increases friction and damage.
Innovation Solution
A fiber guide with a contact surface having a specific ratio of arithmetic mean roughness in the feed direction to orthogonal direction between 0.5 and 1.0, along with tailored skewness and varying roughness in different portions, reduces sliding damage by allowing moderate position change and minimizing contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the arithmetic mean roughness of the contact surface is reduced to minimize fiber damage, then fiber friction is reduced, but the fibers slide at an angle increasing the contact area and susceptibility to damage
Solution Approach 1:
The contact surface is designed with different roughness characteristics in different directions. Specifically, the arithmetic mean roughness in the feed direction (Ra1) is controlled to be 0.01-0.05 μm, while the arithmetic mean roughness in the orthogonal direction (Ra2) is controlled to be 0.02-0.08 μm, creating anisotropic surface properties that guide fiber sliding behavior and prevent angled sliding that increases contact area
2Stability of the object's composition
If the arithmetic mean roughness in the orthogonal direction is increased to prevent angled sliding, then sliding position variability is improved, but the contact area increases and friction damage worsens
Solution Approach 1:
The surface roughness parameters are precisely controlled within specific ranges: Ra1 (feed direction) is maintained at 0.01-0.05 μm and Ra2 (orthogonal direction) at 0.02-0.08 μm. This parameter optimization ensures that the ratio Ra1/Ra2 falls between 0.75 and 1.0, creating the optimal balance between sliding position consistency and minimal contact area
3Productivity
If the fiber feed rate is increased to improve productivity, then output increases, but the likelihood of fiber damage from sliding friction increases
Solution Approach 1:
By optimizing the surface roughness parameters (Ra1: 0.01-0.05 μm, Ra2: 0.02-0.08 μm) and their ratio (0.75-1.0), the contact surface enables smooth fiber sliding even at high feed rates of 3000-8000 m/min. This parameter optimization reduces frictional heating and mechanical stress on fibers, allowing high productivity without increased fiber damage
Data Source
Figure 1A~1D
Figure 2
AI summary
A fiber guide according to an embodiment of the present disclosure comprises a contact surface with a fiber having a ratio of Ra1/Ra2 that is 0.5 or more and less than 1.0, where Ra1 is an arithmetic mean roughness in a feed direction of the fiber and Ra2 is an arithmetic mean roughness in an orthogonal direction orthogonal to the feed direction.