Cylindrical Convex Positioning Structure to Prevent Slip-Out
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Solution Overview
Problem
Existing methods for manufacturing convex portions for sheet metal positioning structures, such as burring and shearing, often result in reduced workability and increased positional deviation due to the convex portion slipping out of the concave portion, especially when the burring shape lacks a reliable guide and has uniform or tapered dimensions that do not securely fit.
Innovation Solution
A convex portion is manufactured with a cylindrical convex body and a guide at its top end, featuring a base with specific inner circumferential surfaces formed through a combination of burring and shearing processes, ensuring a reliable vertical dimension and preventing slippage by using a tapered guide surface that maintains workability during insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a convex portion is formed by simple burring with uniform or tapered dimensions, then the manufacturing process is simple, but the convex portion slips out of the concave portion causing positional deviation
Solution Approach 1:
The convex portion is segmented into three distinct structural zones: a base portion with first inner circumferential surface, a convex body with second inner circumferential surface, and a guide portion with third inner circumferential surface. This segmentation allows each zone to perform its specific function - the base provides structural support, the convex body provides positioning, and the guide portion prevents slippage during insertion, thereby achieving accurate positioning without overcomplicating the overall manufacturing process.
Solution Approach 2:
Different portions of the convex portion are given different local qualities through varying inner circumferential surface configurations. The first inner circumferential surface of the base has one set of characteristics, the second inner circumferential surface of the convex body has different characteristics, and the third inner circumferential surface of the guide portion has yet another set of characteristics. This local differentiation optimizes each zone for its specific function while maintaining manufacturing feasibility.
2Stability of the object's composition
If the convex portion has a larger vertical dimension to prevent slippage, then positioning stability is improved, but workability during insertion is impaired
Solution Approach 1:
The solution transitions from considering only the vertical dimension to incorporating the radial dimension through the guide portion's third inner circumferential surface. By designing the guide portion with specific radial dimensions and a tapered configuration, the system achieves positioning stability through combined vertical and radial dimensional control, rather than relying solely on increased vertical height that would impair insertion workability.
Solution Approach 2:
Instead of making the entire convex portion taller to prevent slippage (which would harm insertion ease), the invention inverts the approach by adding a guide portion with a tapered third inner circumferential surface that actively guides insertion while the convex body's second inner circumferential surface prevents slippage. This inverted thinking separates the insertion function from the anti-slippage function into different structural zones.
3Reliability
If a guide portion with tapered inner circumferential surface is added to prevent slippage, then positioning reliability is improved, but device complexity increases
Solution Approach 1:
The guide portion is merged with the convex body to form an integrated convex portion structure. The third inner circumferential surface of the guide portion is continuously connected to the second inner circumferential surface of the convex body, creating a unified structural element rather than separate components. This merging reduces device complexity while maintaining the anti-slippage function through the tapered guide surface configuration.
Solution Approach 2:
The convex portion is designed as a multi-functional element where the base portion provides structural support, the convex body provides positioning through its second inner circumferential surface, and the guide portion provides insertion guidance and additional anti-slippage functionality through its third inner circumferential surface. This multi-functionality is achieved within a single integrated structure rather than requiring multiple separate components, thereby improving reliability without proportionally increasing complexity.
Data Source
AI summary
A convex portion projecting from a plate member includes a base, a convex body, and a guide. The base is part of the plate member. The convex body erects in a cylindrical shape from the base. The guide is at a top end of the convex body. The base includes a first inner circumferential surface, a second inner circumferential surface, and a third inner circumferential surface. The first inner circumferential surface is continuous with an inner circumferential surface of the convex body and extends in a direction opposite to an erecting direction of the convex body. The second inner circumferential surface is continuous with the first inner circumferential surface and intersects the erecting direction of the convex body. The third inner circumferential surface is continuous with the second inner circumferential surface and is larger in diameter than the first inner circumferential surface.