Double-Sided Expanded Plate Riveting for Stable Heat Sink Fin Alignment
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Solution Overview
Problem
Conventional heat sinks face issues with unstable fin connections due to concentrated clamping forces, leading to potential deformation and loss of parallelism between expanded plates, which affects heat dissipation efficiency.
Innovation Solution
A double-sided expanded plate riveting structure featuring a base with grooves and double-sided expanded plates with upright portions that form folded portions, allowing for secure embedding and deformation within the grooves under a press head, ensuring stable and parallel plate alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the fins are clamped by deforming both sides of the groove, then the fins are coupled to the base, but the clamping force is concentrated at only two point-like positions, resulting in poor clamping effect and unstable connection
Solution Approach 1:
The groove is divided into multiple clamping sections along its length. Instead of deforming both sides of the groove simultaneously at one position, the clamping operation is segmented into multiple sequential pressing actions at different positions along the groove, distributing the clamping force along the fin-root connection line.
Solution Approach 2:
The clamping force is extended from a two-dimensional point-like contact (both sides of the groove opening) to a three-dimensional line-like contact along the groove length. This dimensional transition transforms the clamping effect from concentrated point forces to distributed linear forces, significantly improving connection stability.
2Ease of operation
If a meandering structure is formed in the neck of the double-sided expanded plate to prevent blocking, then the press-riveting tool can move down, but the plate is prone to bend and deformation during riveting
Solution Approach 1:
The upright portion is pre-formed with a folded portion at its bottom end before the riveting process. This preliminary structural preparation allows the press head to engage with the folded portion directly, eliminating the need for meandering paths during pressing and preventing deformation of the expanded plate body.
Solution Approach 2:
The problematic meandering structure is removed entirely. Instead of modifying the neck to create a meandering path, the invention extracts the blocking issue by designing the upright portion with a folded portion that provides direct access for the press head, separating the riveting accessibility function from the expanded plate structure.
3Ease of manufacture
If the double-sided expanded plate is embedded directly without additional structural features, then the manufacturing process is simple, but it is difficult to ensure the parallelism between adjacent plates
Solution Approach 1:
The folded portion acts as an intermediary element between the upright portion and the groove. It serves as a positioning feature that guides the expanded plate into proper alignment during embedding, ensuring parallelism between adjacent plates while maintaining the simplicity of the overall manufacturing process.
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
This solution prevents deformation and maintains parallelism between plates, enhancing the stability and heat dissipation efficiency of the heat sink by distributing clamping forces effectively and ensuring secure riveting.
Implementation Method 1
the folded portion is pressed down in the corresponding groove to be deformed, expanded and fitted in the corresponding groove tightly
Data Source
AI summary
A double-sided expanded plate riveting structure and a double-sided expanded plate riveting method are disclosed. By providing an upright portion, a bottom end of the upright portion is bent toward at least one side to form a folded portion, and at least one side of the folded portion partially extends beyond a plane corresponding to an outer side of an expanded structure for a press head to perform a pressing operation, which effectively avoids a bend and deformation of a double-sided expanded plate in the riveting process.