Pressure-Responsive Masking Plug for Threaded Hole Finishing
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Solution Overview
Problem
Traditional masking plugs are prone to being ejected from threaded holes due to air pressure buildup during finishing operations, and their manual installation and removal can lead to installer injury and inefficiency.
Innovation Solution
A masking plug design featuring an elongated shaft with external threads and a hollow cavity that expands radially to withstand increased pressure, combined with a hexagonal head for tool-driven easy insertion and removal, ensuring the plug remains in place without manual threading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional masking plugs are used during finishing operations, then threaded holes can be protected, but the plugs are ejected from the threaded holes due to air pressure buildup
Solution Approach 1:
The masking plug incorporates a flexible diaphragm that can dynamically expand and contract in response to pressure changes. The diaphragm expands when air pressure builds up during the finishing operation, allowing the plug to withstand the pressure without being ejected, while maintaining its sealing function throughout the pressure cycle.
Solution Approach 2:
The plug design changes the physical state of the diaphragm from a relaxed state to an expanded state in response to pressure parameters. This parameter change allows the plug to adapt to varying pressure conditions during the finishing operation, maintaining retention reliability across different pressure levels.
2Ease of operation
If masking plugs require manual threading into threaded holes, then installation is simple, but repeated hand and wrist motion can lead to installer injury
Solution Approach 1:
The plug design replaces the manual mechanical threading operation with a tool-driven system. The hexagonal drive interface allows a torque tool to install and remove the plug, eliminating the need for repeated manual hand and wrist motions that cause installer injury, while maintaining secure installation.
Solution Approach 2:
The plug incorporates self-centering and self-locking features through its hexagonal drive geometry and thread design, allowing the tool to automatically align and secure the plug without requiring precise manual positioning or repetitive adjustment motions by the installer.
3Ease of manufacture
If masking plugs have threaded portions for manual installation, then they can be easily installed, but installation and removal require repeated installer motion
Solution Approach 1:
The hexagonal drive interface replaces the traditional manual threading mechanism with a tool-driven installation system. This substitution maintains the ease of manufacture of threaded portions while dramatically improving installation efficiency by eliminating repetitive manual motions and reducing installation time.
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
The masking plug effectively protects threaded holes from damage by maintaining its position during finishing operations and simplifies the installation and removal process, reducing the risk of installer injury and enhancing operational efficiency.
Implementation Method 1
the outer surface of shaft is urged radially outward from the axis in response to a pressure buildup in the cavity during the finishing operation
Data Source
AI summary
A masking plug and method are provided for masking a hole in a part during a finishing operation. The masking plug includes an elongated shaft having a first end terminating at a terminal surface and a second end. An outer surface of the shaft has external threads adjacent the first end thereof adapted for receipt in the hole. An enlarged body has a first end operatively connected to the shaft and a second operatively connected to a head. The diameter of the body is greater than the diameter of the shaft. The head has a polygonal configuration and is adapted for forming a mating relationship with a tool. The terminal surface of the shaft includes a hollow cavity formed therein which is configured to urge the outer surface of shaft radially outward in response to a pressure buildup in the cavity during the finishing operation so as to maintain the shaft in hole.