Adaptive Bending Structure for Lapping Device Bow Control
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Solution Overview
Problem
Current lapping devices have limited control width and stroke at the end bending nodes, which restricts the ability to effectively control the bow and curvature of workpieces during the lapping process, leading to reduced tolerance control and increased residual stress.
Innovation Solution
The lapping device employs an adaptive bending structure with wider outer bending fingers and longer bending beams at the end nodes, allowing for increased control width and stroke, enabling bi-directional force input through actuator fingers to the workpiece platform for precise bending control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bending structure uses uniform width bending fingers and standard beam lengths, then the device complexity is reduced and manufacturing is easier, but the control width and stroke at end bending nodes are limited
Solution Approach 1:
The bending structure implements local quality by varying the width of bending fingers along the structure - outer bending fingers have extended width while inner bending fingers have standard width. This localized modification increases control width and stroke at end bending nodes without requiring the entire structure to be complex, thereby improving bow and curvature control while maintaining reasonable device complexity
Solution Approach 2:
The bending structure is segmented into multiple bending fingers with different widths (outer and inner), allowing independent optimization of each segment's function. This segmentation enables the outer fingers to provide enhanced control at the ends while inner fingers maintain standard characteristics, resolving the contradiction between improved precision and increased complexity
2Ease of operation
If the bending structure uses extended width outer bending fingers and longer bending beams, then the control width and stroke are increased, but the device complexity increases
Solution Approach 1:
The adaptive bending structure applies local quality by extending the width of only the outer bending fingers and lengthening only the bending beams connected to outer and intermediate nodes, rather than uniformly modifying the entire structure. This localized adaptation improves ease of operation at critical end nodes while minimizing the overall increase in device complexity
3Manufacturing precision
If the bending structure provides limited control width and stroke, then the device complexity is reduced, but the tolerance control deteriorates and residual stress increases
Solution Approach 1:
The bending structure uses local quality by implementing extended width outer bending fingers and longer bending beams at specific locations to improve tolerance control for bow and curvature. This localized enhancement provides the necessary control precision without requiring the entire device to be complex, thereby improving manufacturing precision while maintaining reasonable device complexity
Data Source
AI summary
An adaptive bending structure or insert for a lapping device is disclosed. In illustrated embodiments the bending structure provides a wider control width between bending nodes for imparting bending to a workpiece for lapping or longer beam length to increase stroke input at outer ends of the bending structure. In illustrated embodiments, outer bending fingers of the bending structure have a wider width than inner bending fingers to provide the wider control width of the adaptive bending structure. The wider bending fingers of the bending structure connect to actuator fingers of an actuator module to adapt the actuator module to provide an increased control width for controlling bow and curvature of the workpiece during the lapping process.