Undercutting Tool Spreading Elements Axial Radial Force Conversion
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Solution Overview
Problem
Existing undercutting tools for producing transverse grooves in drilled holes in concrete or stone face inefficiencies in converting axial force to radial force, leading to potential cutting element misalignment, damage during operation, and reduced robustness due to separate components subjecting to high mechanical stress and incomplete force conversion.
Innovation Solution
An undercutting tool with sleeve-type spreading elements that are axially displaceable and rotationally coupled to a shank, featuring oblique end faces and radial play, allowing efficient conversion of axial force to radial force and back, with components designed to move independently and maintain functionality even if one cutting element is blocked, and easy servicing by replacing worn parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If cutting elements are guided through through-bores in the spreading element, then the structure is simple, but the cutting elements have play and can become caught on the hole wall, leading to misalignment and damage
Solution Approach 1:
The cutting elements are extracted from the through-bores and placed in grooves on the outer surface of the spreading element. This eliminates the play and misalignment issues associated with through-bore guidance while maintaining structural simplicity. The grooves provide precise guidance without requiring the cutting elements to pass through the spreading element.
2Device complexity
If the spreading element has gradual tapering slide surfaces, then the structure is simple, but the conversion of axial force to radial force is inefficient
Solution Approach 1:
The spreading element is segmented into multiple spreading elements arranged axially. Each spreading element has a specific spreading section with a defined spreading angle. This segmentation allows for more efficient force conversion while maintaining structural simplicity through modular design.
Solution Approach 2:
The spreading element combines different functional sections: a spreading section with optimized spreading angle for efficient force conversion, and a guide section for precise positioning. This composite structure optimizes both force conversion efficiency and structural simplicity.
3Device complexity
If cutting elements are designed with through openings for the slide, then the structure is simple, but the cutting elements have low robustness and can easily break under load
Solution Approach 1:
The cutting elements are extracted from the through-bore configuration and placed in surface grooves, eliminating the structural weakness of through openings. The cutting elements can now be designed as solid, robust components without through holes, significantly improving their strength and resistance to breaking under load.
4Manufacturing precision
If the spreading element is supported on the hole bottom, then the working position is precisely defined, but the tool requires the hole to have sufficient depth
Solution Approach 1:
The support mechanism is changed from axial support at the hole bottom to radial support on the hole wall. The spreading element is supported radially by the hole wall through the guide grooves, allowing precise working position definition without requiring sufficient hole depth for axial support.
5Power
If multiple spreading elements are used to improve force distribution, then the force conversion is more efficient, but the device complexity increases
Solution Approach 1:
The single spreading element is segmented into multiple spreading elements arranged axially. Each spreading element handles a portion of the force conversion, improving overall efficiency. The modular segmented design allows for scalable complexity, adding only as many elements as needed for the specific application requirements.
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 tool achieves efficient conversion of axial to radial force, prevents cutting element misalignment and damage, ensures unimpeded cutting function even with radial mobility issues, and simplifies servicing by allowing easy replacement of worn parts.
Implementation Method 1
The oblique end faces, extending in a direction not perpendicular to the longitudinal axis, are such that, as a result of the axial distance between the supports being reduced, respectively adjacent spreading elements are displaced in radial directions that are substantially opposite, so that the axial force is in each case converted to a radial force
Data Source
AI summary
An undercutting tool for producing transverse grooves in a drilled hole. An upper support and a lower support axially delimit a receiving region of a shank. At least two spreading elements are disposed in the receiving region between the spreading elements and the receiving region. The shank and the supports are disposed so the axial distance between the supports can be reduced by exerting an axial force. The spreading elements each have an oblique upper and lower end face, which each have such an outer geometric shape, extending in a direction not perpendicular to the longitudinal axis and are displaced in substantially opposite radial directions, and the axial force is in each case converted to a radial force in the radial directions.