Lap Shear Bonding Fixture for Alignment and Adhesive Inspection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing lap shear bonding fixtures require careful alignment and positioning of shims and panels, making it difficult to verify proper alignment, excess adhesive removal, and uniform adhesive distribution, as the bond area is inaccessible once the top tool is placed.
Innovation Solution
A fixture and method using a bottom tool, a top tool, and spacers instead of shims, where the spacers attach to the bottom tool's sides to provide spacing, allowing direct attachment of panels and enabling visual inspection and adhesive distribution verification through an opening in the bottom tool and partial length of the top tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If shims and panels are carefully positioned to ensure alignment, then manufacturing precision is improved, but device complexity and operation difficulty increase
Solution Approach 1:
Alignment pins are introduced as intermediary elements that mediate between the top tool and bottom tool. These pins fit into corresponding holes to automatically establish proper alignment, eliminating the need for manual positioning of shims and panels. The alignment pins serve as a mechanical interface that ensures precise positioning while simplifying the assembly process.
Solution Approach 2:
The fixture design enables self-alignment through the inherent geometry of the alignment pins and holes. When the top tool is placed on the bottom tool, the alignment pins automatically guide the components into the correct positions without requiring external intervention or complex positioning mechanisms. The system self-corrects alignment through its structural design.
2Stability of the object's composition
If top tool and bottom tool are full length, then structural stability is improved, but accessibility and inspection capability deteriorate
Solution Approach 1:
The top tool is segmented into two parts: a full-length bottom portion that provides structural stability and spans the entire bond area, and a shorter top portion that contains the handle and applies force. This segmentation allows the tool to maintain stability while creating space for observing and accessing the bond area during the bonding process.
Solution Approach 2:
The alignment pins extend vertically through the bond area, creating a third dimension of access. This vertical dimension allows operators to insert pins from above to establish alignment, while the horizontal dimensions remain occupied by the full-length tools providing stability. The bond area becomes accessible through this vertical pathway.
3Manufacturing precision
If shims are used for spacing, then spacing precision is improved, but alignment verification and adhesive inspection become difficult
Solution Approach 1:
The shims are extracted from the assembly and replaced with spacers that are attached to the bottom tool. This extraction allows the spacers to remain in place while the top tool is positioned, enabling continuous visual inspection of the bond area. The spacers provide the necessary spacing function without obstructing the view or access to the adhesive application area.
Data Source
AI summary
A fixture for lap shear bonding a bottom panel to a top panel comprises a bottom tool, a first spacer, a second spacer, and a top tool. The bottom tool has a quadrilateral shape including a top surface, a bottom surface, and four side surfaces and is configured to retain the bottom panel on the top surface. The first spacer is attached to the top surface of the bottom tool adjacent to one edge. The second spacer is attached to the top surface of the bottom tool adjacent to an opposing edge. The top tool has a quadrilateral shape including a top surface, a bottom surface, and four side surfaces and is configured to retain the top panel on the bottom surface. The top tool is further configured to attach to the first spacer and the second spacer such that the top panel contacts the bottom panel.