Composite Fastener Smoothness Control via Dynamic Countersink Depth
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Solution Overview
Problem
Managing the smoothness of fasteners in composite material parts is challenging due to the increased compressive crushing compared to metal parts, making it difficult to ensure proper fastening using traditional methods.
Innovation Solution
A method involving measuring the smoothness of fasteners in countersink through-holes, determining and forming countersink depths based on measured smoothness, and using a countersink depth calculation equation to ensure accurate fastening of composite material parts with countersunk bolts and nuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional fastening methods are used for composite material parts, then the fastening process is simple, but the smoothness of the fastener cannot be properly managed due to increased compressive crushing
Solution Approach 1:
The invention measures the smoothness of the fastener before fastening operations are completed. By measuring the smoothness of the fastener protruding from the workpiece before nut attachment, the method enables predictive control of the final fastening quality without requiring complex post-fastening measurements or adjustments.
Solution Approach 2:
The invention establishes a feedback mechanism where the measured smoothness value is used to determine the appropriate countersink depth for subsequent fastening operations. This feedback loop allows the system to automatically adjust processing parameters based on actual measurements, ensuring consistent smoothness management across multiple fastening operations.
2Manufacturing precision
If the thickness of fastened work is measured before fastening, then the measurement process is simple, but it is difficult to manage smoothness based on thickness alone for composite materials
Solution Approach 1:
The invention replaces traditional mechanical thickness measurement methods with optical measurement technology. By using an optical measurement device to measure the smoothness of the fastener, the system achieves higher measurement precision and accuracy that cannot be obtained through simple thickness measurements alone.
3Manufacturing precision
If countersink depth is fixed for all fastening operations, then the manufacturing process is simple, but the smoothness requirement cannot be met for composite material parts
Solution Approach 1:
The invention transforms the countersink depth from a fixed static parameter to a dynamic parameter that is determined based on measured smoothness values. The countersink depth calculation equation dynamically adjusts the required depth based on the actual smoothness measurement, allowing the system to adapt to variations in composite material properties and fastening conditions.
Data Source
AI summary
In a method of fastening composite material parts, a first smoothness of a first fastener is measured which is arranged to a first countersink through-hole which is formed in a first fastened work as stacked composite material parts. A second countersink depth is determined based on the first smoothness. A second countersink through hole with a second countersink depth is formed in a second fastened work as the composite material parts. The second fastened work is fastened using the second fastener arranged to the second countersink through-hole.