Fixing Object Groove Structure for Visual Weld Insertion Check
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Solution Overview
Problem
Existing methods for fixing objects to fixation items, such as those involving slits and bosses, often make it difficult to visually verify the insertion of the tip portion after welding, leading to potential backlash and fixation failures due to overlooked misalignment.
Innovation Solution
A fixing object with a supporting part featuring a hole and a groove that is one-way open at the surface where one exit is present but not at the surface where the other exit is present, allowing for visual assessment of the fixed state by ensuring the deformed portion contacts the groove's bottom surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a slit is formed to reach the bottom portion of an item, then misalignment prevention is improved, but visual checkability of the tip portion insertion deteriorates
Solution Approach 1:
The invention transitions from a through-hole slit (one dimension) to a groove with controlled depth (adding depth dimension). The groove extends only partially into the item, creating a three-dimensional structure that allows light to reflect from the bottom surface while maintaining the alignment function, thus resolving the contradiction between precision and detectability.
Solution Approach 2:
The groove acts as an intermediary structure between the surface and the bottom portion. It provides a visual indicator (reflective bottom surface) that mediates the detection of tip portion insertion without requiring a through-hole, thus enabling visual inspection while maintaining alignment precision.
2Difficulty of detecting and measuring
If the groove is made deeper to improve visual assessment, then visual checkability is improved, but structural strength deteriorates
Solution Approach 1:
The groove is designed to extend only partially into the item rather than through the entire thickness. This partial action provides sufficient depth for visual assessment (light reflection from bottom surface) while maintaining adequate material thickness to preserve structural strength and prevent item breakage.
3Difficulty of detecting and measuring
If the groove is made wider to improve visual assessment, then visual checkability is improved, but manufacturing precision deteriorates
Solution Approach 1:
The groove is designed with specific local dimensions: narrow enough at the opening to maintain alignment precision and guide the tip portion correctly, but with sufficient depth to create a visible reflective bottom surface. This local quality optimization resolves the contradiction between visual checkability and alignment precision.
Data Source
AI summary
To improve the visual probability of the quality of a fixed state of a fixing object fixed to a fixation item, the fixing object includes the supporting part having a hole and a groove formed in proximity to the hole. The groove is provided with a one-way open part, opened in a surface of the supporting part in which one exit of the hole is located and not opened in a surface of the supporting part in which the other exit of the hole is located, and the distance from the center of gravity of the hole to the portion of the groove that is farthest from the center of gravity of the hole is greater than the distance from the center of gravity to a side-surface portion in the hole that is closest to the groove without touching the groove.