Aircraft Skin Hole-Making Normal Locking for Curved Surface Positioning
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Solution Overview
Problem
Current automated hole-making machinery for aircraft skins is cumbersome and difficult to adapt to complex curved surfaces due to high rigidity requirements, leading to inefficiencies in positioning and hole-making processes.
Innovation Solution
A system for hole making that includes a posture adjustment part with Y-axis, RX-axis, RY-axis, and Z-axis drive units, a normal positioning and locking part with an expansion sleeve mechanism, and a hole-making execution part with a variable-angle head, which simplifies the positioning process by locking the normal direction and reducing external forces through axial positioning grooves and ribs, and auxiliary cylinders for stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high rigidity is used in automated hole-making machinery, then positioning stability is improved, but device complexity and size increase
Solution Approach 1:
The patent employs dynamic positioning mechanisms including a five-axis linkage system with adjustable degrees of freedom, allowing the equipment to adapt its rigidity and positioning characteristics based on operational requirements rather than maintaining constant high rigidity throughout the structure
Solution Approach 2:
The positioning system is divided into multiple independent modules including separate drive units for each axis (X, Y, Z, RX, RY), individual positioning mechanisms for the drill plate, and modular support structures, allowing each segment to be optimized independently rather than requiring the entire system to maintain uniform high rigidity
2Manufacturing precision
If high rigidity is used in automated hole-making machinery, then positioning accuracy is improved, but adaptability to complex curved surfaces deteriorates
Solution Approach 1:
The system uses a variable rigidity positioning mechanism with five-axis linkage that can dynamically adjust its degrees of freedom and stiffness characteristics to match the local geometry of the workpiece surface, enabling accurate hole-making on both flat and complex curved surfaces
Solution Approach 2:
The positioning system incorporates adjustable parameters including the degrees of freedom of the linkage mechanism, the rigidity of positioning elements, and the geometry of support structures, which can be modified to optimize both precision and adaptability for different workpiece types
3Device complexity
If conventional positioning mechanisms are used, then structural simplicity is maintained, but positioning accuracy and stability deteriorate
Solution Approach 1:
The system performs preliminary positioning actions by pre-establishing the normal direction of the workpiece surface using the expansion sleeve locking mechanism and auxiliary cylinders before the actual hole-making operation, ensuring accurate positioning without requiring overly complex real-time adjustment mechanisms
Solution Approach 2:
The patent introduces intermediary elements including the expansion sleeve locking mechanism, auxiliary cylinders, and guide units that mediate between the positioning system and the workpiece, simplifying the overall structure while improving positioning accuracy through these intermediate components
Data Source
AI summary
The invention discloses a system for hole making for an aircraft skin by normal positioning and locking. The hole-making system includes a posture adjustment part, a normal positioning and locking part and a hole-making execution part. This system solves the problems that the device in the prior art has high complexity and cumbersome positioning and does not adapt to complex curved surfaces, thereby failing to satisfy the needs of efficient hole making in different space states. In the present invention, the expansion of an outer expansion sleeve in a bottom sleeve locks a normal direction for hole making, thereby ensuring the positioning accuracy of the normal direction. An axial position is locked by the mutual cooperation of an axial positioning groove of the bottom sleeve and an axial positioning rib of the outer expansion sleeve. A hole-making auxiliary cylinder contracts to counteract part of an axial force for hole making.