Inner Hole Coating Adhesion Testing Device
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Solution Overview
Problem
Traditional adhesive strength tests for inner hole coatings are inadequate as they cannot effectively evaluate the shear and tensile adhesive strength of coatings on curved surfaces and require cumbersome device switching for load-holding and testing.
Innovation Solution
A testing device comprising a positioning assembly, guide ring, assisting assembly, pull rod, and press rod that allows for simultaneous load-holding and testing of inner hole coatings, enabling both shear and tensile adhesive strength evaluations on a single device by applying radial and axial pressures through a tapered surface and pull hook mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional separate testing devices are used for shear and tensile adhesive strength tests, then each test can be performed with dedicated equipment, but device switching is required which is troublesome and time-consuming
Solution Approach 1:
The patent combines both shear testing and tensile testing functions into a single integrated testing device. The testing apparatus includes a positioning assembly for clamping the sample, a guide ring with threaded hole and guide groove, an assisting assembly with adhesive end, a pull rod with tapered surface for applying axial tension, and a press rod for applying radial pressure. This unified device eliminates the need to switch between separate testing machines, thereby saving time while maintaining measurement precision for both shear and tensile adhesive strength evaluations.
Solution Approach 2:
The testing device is designed with multi-functionality to perform both shear and tensile adhesive strength tests on inner curved surface coatings. The positioning assembly secures the sample, the guide ring provides guidance and threading, the assisting assembly adheres to the coating, the pull rod applies axial tensile force, and the press rod applies radial compressive force. This universal device can evaluate both types of adhesive strength without requiring separate specialized equipment, resolving the contradiction between measurement precision and time loss.
2Ease of manufacture
If traditional testing methods use coatings on outer edges or planes, then testing setup is simple, but the test conditions do not reflect actual inner hole coating conditions on curved surfaces
Solution Approach 1:
The patent specifically addresses the curvature issue by designing the testing apparatus to accommodate inner curved surface coatings. The positioning assembly is configured to clamp samples with inner holes, and the assisting assembly with its adhesive end contacts the coating on the curved inner surface. The guide ring and pull rod mechanism are designed to apply forces appropriately on this curved geometry, ensuring that the test conditions accurately represent actual service conditions while maintaining operational feasibility.
Solution Approach 2:
The assisting assembly is designed with specific local properties to adhere to the inner hole coating on the curved surface. The adhesive end of the assisting assembly is configured to bond with the coating material, and the tapered surface of the pull rod applies localized radial pressure to ensure proper contact and force transmission. This localized adaptation to the curved surface geometry enables reliable testing that reflects actual conditions without requiring complex overall system redesign.
3Productivity
If a single device is used for both load-holding and testing functions, then device switching is eliminated, but the device structure becomes more complex
Solution Approach 1:
The integrated testing device is divided into distinct functional modules: a positioning assembly for clamping the sample, a guide ring with threaded hole and guide groove for motion control, an assisting assembly with adhesive end for bonding to the coating, a pull rod with tapered surface for applying axial tension, and a press rod for applying radial pressure. This segmentation allows each component to perform its specific function while being part of a unified system, managing complexity through modular functional division while achieving high productivity by eliminating device switching.
4Adaptability or versatility
If radial and axial pressures are applied simultaneously through the same device, then both shear and tensile strengths can be evaluated, but the mechanical structure becomes more complicated
Solution Approach 1:
The device employs asymmetric force application mechanisms: the pull rod with its tapered surface applies axial tensile force along the longitudinal axis, while the press rod applies radial compressive force perpendicular to the axial direction. These asymmetric force vectors are applied through different mechanical paths - the pull rod through the threaded connection and guide groove, and the press rod through its sliding connection. This asymmetric design enables dual testing capability by applying different force directions independently, managing structural complexity through functional differentiation of the force application mechanisms.
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 device efficiently evaluates the adhesive strength of inner hole coatings on curved surfaces, saving time and effort by eliminating the need for device switching and allowing comprehensive testing of both shear and tensile strengths on the same apparatus.
Implementation Method 1
the pull rod is configured to apply an axial tension to the inner hole coating via the guide ring and the assisting assembly, and apply a radial pressure to the inner hole coating via the tapered surface and the assisting assembly
Implementation Method 2
another end of the assisting assembly is adhesive to the inner hole coating of the sample to be tested
Implementation Method 3
the pull rod is configured to apply an axial tension to the inner hole coating via the guide ring and the assisting assembly
Implementation Method 4
the press rod is capable of applying a radial tension to the inner hole coating via the pull hook and the assisting assembly
Data Source
AI summary
Disclosed are a testing device and a testing method for adhesive strength of an inner hole coating. A pull rod of the testing device for the adhesive strength of the inner hole coating may apply an axial tension to the inner hole coating via a guide ring and an assisting assembly, and may also apply radial pressure to the inner hole coating via a tapered surface and the assisting assembly. And the press rod may apply a radial tension to the inner hole coating via the pull hook and the assisting assembly. The testing method for the adhesive strength of the inner hole coating adopts the above-mentioned testing device for adhesive strength of an inner hole coating, a tensile adhesive strength test and a shear adhesive strength test may be performed on a same device.