Interference-Fit Pin Fixtures for Zero-Mask Part Finishing
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Solution Overview
Problem
Current methods for securing large parts during surface treatments, such as those used in aircraft components, require labor-intensive processes due to the need for masking and re-mounting, which increases time and effort.
Innovation Solution
The use of adjustable diameter pins forming an interference fit with holes in the part allows securement without masking, enabling surface treatments without re-mounting, and facilitates rotation of the part for easier access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fixtures are used to secure large parts, then the parts are held in place, but the fixtures mask off portions of the part surface preventing surface treatment
Solution Approach 1:
The fixture is segmented into multiple discrete pins that are inserted into holes at strategic locations on the part. Each pin independently secures a specific region, allowing the rest of the part surface to remain exposed and accessible for surface treatment operations.
Solution Approach 2:
The masking function is completely removed from the fixture design. Instead of using broad contact surfaces that block access to the part, the fixture extracts support to discrete pin points, eliminating the masking problem while maintaining securing functionality.
2Reliability
If traditional fixtures mask portions of the part, then the part is secured, but multiple fixtures and re-mounting are required for complete surface treatment
Solution Approach 1:
The pin-based fixture system is designed to accommodate surface treatment operations as its primary function while maintaining securing capability. The same fixture configuration enables both part support and unobstructed access for complete surface treatment without requiring re-mounting or multiple fixtures.
Solution Approach 2:
The fixture is designed in advance with pin locations and dimensions optimized for surface treatment operations. This preliminary design ensures that the entire part surface remains accessible during treatment, eliminating the need for subsequent re-mounting or touch-up operations.
3Reliability
If pins with fixed diameter are used, then the part is secured, but the fixture cannot be adapted to different part configurations
Solution Approach 1:
The pins are designed with adjustable diameter capability, allowing them to be dynamically resized to match different hole dimensions in various part configurations. This dynamic adjustment feature enables the same fixture to adapt to multiple part types and configurations while maintaining reliable securing.
Solution Approach 2:
The pin diameter parameter can be changed to accommodate different part hole sizes. This parameter variability allows the fixture to be adapted to different part configurations without requiring complete fixture redesign, enhancing versatility while maintaining secure attachment.
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 method reduces labor and time by allowing entire surface treatment without masking and enables easy reorientation of large parts, improving efficiency in fabrication processes.
Implementation Method 1
forming an interference fit between a pin and a wall defining a hole, supporting a weight of the part with the interference fit
Data Source
AI summary
Systems and methods are provided for securement of parts. One embodiment is a method for securing a part during fabrication. The method includes forming an interference fit between a pin and a wall defining a hole, supporting a weight of the part with the interference fit, and rotating the part around an axis of the part while the weight of the part is supported.