Abrasive Polishing Tool Radial Expansion Key Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current smoothing/polishing tools with expansion strips face challenges in achieving precise size and shape control, as well as maximum surface finish, particularly in through and blind holes, due to limitations in the radial adjustment and mounting of abrasive sectors.
Innovation Solution
A sector/bushing coupling system using a longitudinally arranged key with radial teeth is introduced, which facilitates the radial expansion and rotation of the bushing, ensuring correct mounting and preventing incorrect positioning by engaging with corresponding holes on the abrasive-carrier bushing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If independent expansion strips are used in a cylindrical shank, then the tool can achieve material removal and surface finishing, but the radial adjustment precision and mounting reliability are insufficient
Solution Approach 1:
An intermediate bushing is introduced between the expansion strips and the abrasive sectors. This bushing serves as a mediator that receives radial expansion force from the strips and transfers it to rotate and position the abrasive sectors precisely. The bushing has longitudinal holes that engage with keys on the strips, creating a reliable mechanical connection that improves both mounting reliability and adjustment precision.
Solution Approach 2:
The tool is divided into distinct functional segments: expansion strips for radial force application, an intermediate bushing for force transmission and rotation, and abrasive sectors for material removal. This segmentation allows each component to be optimized for its specific function, with the bushing acting as a rotational interface that converts radial expansion into controlled abrasive sector positioning.
2Adaptability or versatility
If a conical rod is used for radial adjustment, then the strips can be positioned at different diameters, but the control precision and stability are limited
Solution Approach 1:
The intermediate bushing acts as a precision mediator between the conical adjustment rod and the abrasive sectors. As the conical rod expands the bushing radially, the bushing's rotation is controlled by its engagement with the keys, providing stable and precise diameter control. This intermediary mechanism converts the conical rod's radial expansion into controlled rotational positioning of the abrasive sectors.
Solution Approach 2:
The system transitions from static strip positioning to dynamic controlled expansion. The conical rod provides continuous radial adjustment capability, allowing the bushing and abrasive sectors to be dynamically positioned at any diameter within the expansion range. This dynamic adjustment mechanism, mediated by the bushing's rotational engagement, improves both adaptability and control precision.
3Adaptability or versatility
If multiple strips are used for different hole sizes, then the tool can handle various diameters, but the device complexity increases
Solution Approach 1:
The intermediate bushing serves multiple functions: it receives radial expansion from the strips, converts this expansion into controlled rotation, positions the abrasive sectors, and provides a stable mounting interface. This multi-functional design allows the same basic structure to handle various hole sizes by simply adjusting the expansion force, eliminating the need for multiple specialized strip assemblies for different diameter ranges.
Solution Approach 2:
The system uses dynamic radial expansion of a single bushing mechanism to achieve multiple diameter settings, replacing the need for multiple static strip configurations. The conical rod provides continuous adjustment capability, allowing one tool configuration to adapt to various hole sizes through controlled expansion, thereby reducing overall device complexity while maintaining versatility.
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 solution enhances the radial expansion and rotation of the bushing, improving the tool's ability to achieve precise diameters and surface finishes, while ensuring correct assembly and preventing misalignment, resulting in improved material removal performance and surface quality.
Implementation Method 1
a sector/bushing coupling system by means of suitable key, longitudinally arranged, which has proven to be very strong... the key bears one or more teeth which are radially extended so as to interfere and engage with corresponding holes or slits obtained on the abrasive-carrier bushing
Implementation Method 2
the solution with key allows this expansion, facilitated, as stated, by the underlying wedge-shaped pin
Implementation Method 3
The smoothing/polishing strips bear on the external surface abrasive sectors made of material such as aluminum oxide, silicon carbide, CBN diamond, with different grain sizes and stone configurations, which remove the material
Data Source
AI summary
A smoothing/polishing tool (10) of the type including a hollow cylindrical body (1), a plurality of expansion sectors (4) for a plurality of abrasives (6) integrally mounted on the external surface of an elastic bushing (7), fit on the expansion sectors (4). The tool (10) includes at least one key (11) insertable in one or more cavities (12) or notches obtained along one or more sectors (4); the key (11) bears one or more teeth (11A) adapted to interfere and be engaged with corresponding one or more holes or slits (13) obtained on the bushing (7); following the rotation of the smoothing/polishing tool (10), the key (11) drives the bushing (7) in rotation and at the same time supports the radial motion of the bushing during expansion.