Pendulum Impact Tester Abutment with Rotatable Bearing Surfaces
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Solution Overview
Problem
Pendulum impact testers with U-shaped hammers face challenges in maintaining the service life of abutments and bearings, as they require frequent replacement and recalibration, leading to unproductive downtime during testing.
Innovation Solution
A ram design with a modular abutment and support system, where the abutment can be rotated 180° to use both sides of the bearing piece, and multiple bearing surfaces can be used sequentially, allowing for extended service life and quick replacement of worn surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a conventional abutment design with a single bearing surface is used, then the device structure is simple, but the service life of the abutment is short requiring frequent replacement
Solution Approach 1:
The abutment is divided into multiple bearing surfaces (first bearing surface and second bearing surface) that can be used sequentially. Each bearing surface can be independently worn and replaced, extending the overall service life of the abutment component while maintaining a relatively simple overall structure.
Solution Approach 2:
The abutment design changes the usable parameter from a single bearing surface to multiple bearing surfaces. By rotating the abutment 180 degrees, a fresh bearing surface is brought into contact with the specimen, effectively extending the service life without significantly increasing structural complexity.
2Measurement precision
If the abutment bearing surface is made larger to improve stability, then the energy transfer becomes less precise, but if it is made smaller for precision, then the service life decreases
Solution Approach 1:
The bearing surface is segmented into multiple discrete contact areas (first bearing surface and second bearing surface). Each segment maintains the optimal small size for precise energy transfer to the specimen, while the multiplication of segments extends the overall service life through sequential usage.
3Ease of manufacture
If the abutment is designed as a single-piece structure, then the manufacturing is simple, but the replacement of worn surfaces requires complete abutment replacement
Solution Approach 1:
The abutment structure is segmented into multiple bearing surfaces that can be independently utilized. When one bearing surface is worn, the abutment can be rotated 180 degrees to expose a fresh bearing surface, eliminating the need for complete abutment replacement and reducing downtime without complicating the manufacturing process.
Solution Approach 2:
The design changes the operational parameter from single-use to multi-use by incorporating multiple bearing surfaces. This allows the same abutment component to serve multiple testing cycles before replacement is needed, improving productivity while maintaining manufacturing simplicity.
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 design extends the service life of abutment components, reduces downtime by allowing quick replacement of worn surfaces, and maintains precise measurement accuracy through even energy transfer and multiple installation positions.
Implementation Method 1
The first bearing piece (20) is designed to absorb an impact force of a pendulum hammer (4) with a first impact surface (65)
Data Source
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AI summary
A striking frame (12) for a pendulum impact tester (2) with a U-shaped pendulum hammer (4), e.g., for Charpy impact tests, has at least one abutment (18, 18'), at least one support (16), and a swing chamber (94). The striking frame (12) laterally delimits the swing chamber (94) by means of the abutment (18, 18'). The abutment (18, 18') has a first and a second end face (22, 22'). At least one end face (22, 22') has a multiple of a bearing surface (65, 66) for a specimen (98), whereby the abutment (18, 18') comprises at least four bearing surfaces (65, 66) as striking surfaces (25). The invention also relates to a pendulum impact instrument (2) with such an impact block (12) and a method for preparing a pendulum impact instrument (2) for carrying out a material test on a metallic sample (98).Depending on the installation position of the bearing piece (20), the striking surfaces (25) on the end face (22, 22') serve as bearing surfaces (65, 66) for a sample (98) on a part of the end face (22, 22').