Fiber Layup Chamfer Cutting Method with Preliminary Relief Cuts
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Solution Overview
Problem
Producing fiber layup blanks with precise chamfer edges is challenging due to cutter strain and precision issues during chamfer cuts, leading to potential cracking from incomplete connection surfaces and scoring due to tolerances.
Innovation Solution
A method involving preliminary and relief cuts outside the intended cross-section, followed by a chamfer cut, decouples the residual strip from the fiber layup, allowing for precise and low-strain chamfer cutting, with the contour cut maintaining high precision through a fiber bridge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a chamfer cut is performed after a contour cut to produce the blank edge, then the blank can be produced with the intended contour, but the fiber layup is displaced along the cutter wedge causing cutter strain and reduced cutting precision
Solution Approach 1:
The cutting process is divided into three distinct stages: a preliminary cut to separate the residual strip, a relief cut to create a processing allowance, and a chamfer cut to produce the final edge. This segmentation allows each cut to be optimized independently, reducing the displacement effect during the chamfer cut while maintaining precision.
Solution Approach 2:
The preliminary cut and relief cut are performed before the chamfer cut to pre-position the fiber layup and reduce the amount of material that needs to be displaced during the final chamfer cutting operation. This preliminary action minimizes cutter strain and improves cutting precision.
2Force
If additional notches are added to the fiber layup to reduce cutter strain during chamfer cutting, then the displacement effect is reduced, but the complexity of the cutting process increases and scoring may still occur due to tolerances
Solution Approach 1:
Instead of adding notches to the fiber layup, the invention segments the cutting process into three distinct operations with specific cutters. This approach reduces cutter strain through process segmentation rather than through geometric modifications to the workpiece, avoiding increased process complexity.
3Manufacturing precision
If the contour cut is performed after the chamfer cut, then the blank can be produced, but the fiber bridge is interrupted reducing the mounting for correct cutting and precision
Solution Approach 1:
The preliminary cut and relief cut are performed before the chamfer cut, which in turn is performed before the final contour cut. This sequence ensures that the fiber bridge remains continuous throughout the process, providing stable mounting for precise contour cutting in the final stage.
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
Ensures high cutting precision and reduced cutter strain, preventing scoring and incomplete connections, while maintaining the mechanical properties of the residual strip for precise contour cutting.
Implementation Method 1
the fiber layup, which is suctioned onto a cutting support of a cutting table
Data Source
AI summary
A method is described for producing a blank (1) from a fiber layup (5) having an edge (3) forming a chamfer (2), wherein the fiber layup (5), which is suctioned onto a cutting support (6) of a cutting table (7), is cut through using a contour cut (17), which extends into the cutting support (6), along the intended contour (4) of the blank (1) and is provided with the chamfer (2) using a chamfer cut (16) running at a flat chamfer angle (α) along the intended contour (4). To provide advantageous production conditions, it is proposed that the fiber layup (5) is firstly precut by two cuts, which end above the cutting support (6) and run outside the intended cross section of the edge (3), namely a preliminary cut (10) running transversely to the fiber layup (5) along the contour region and a relief cut (11), which determines a processing allowance (15) to the chamfer (2), and then the chamfer (2) is cut using the chamfer cut (16), which ends outside the intended contour (4) in the fiber layup (5), before the intended contour (4) of the blank (1) is produced by the contour cut (17).