Quick-Change Arbor Locking Structure to Eliminate Tool Runout
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Solution Overview
Problem
Traditional quick change arbors have complex structures, high manufacturing costs, and significant axial gaps leading to runout issues during tool replacement.
Innovation Solution
A quick change arbor design featuring an obliquely arranged first guiding groove with a locking part and elastic component, allowing for simple tool installation and disassembly via a pulling ring, eliminating gaps through contact with the tool surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional quick change arbors are used, then tool replacement speed is improved, but structural complexity increases and manufacturing cost rises
Solution Approach 1:
The locking mechanism is segmented into a locking part with a locking surface and a pulling ring with a pulling surface, allowing independent movement and function of each component. The guiding groove is divided into a first guiding groove for axial movement and a second guiding groove for radial movement, enabling sequential locking actions that simplify the overall structure while maintaining quick change capability
Solution Approach 2:
The locking part is designed to move from the locking position to the releasing position when the pulling ring is pulled axially, inverting the traditional locking mechanism where pulling would engage the lock. This inversion simplifies the operation to a single pulling motion that automatically unlocks and removes the tool
2Productivity
If traditional quick change arbors are used, then tool replacement is faster, but manufacturing cost increases
Solution Approach 1:
The arbor main body is designed with a universal assembling position that can accommodate different tool types (drill bits, hole saws, etc.) with various cross-section shapes. The locking mechanism uses a standardized first guiding groove and locking part configuration that can be replicated across different arbor designs, reducing manufacturing complexity and cost while maintaining quick change functionality
Solution Approach 2:
The elastic component automatically pushes the locking part to engage with the tool surface without requiring additional actuators or complex control mechanisms. The system uses the pulling motion itself to trigger the unlocking sequence through the interaction between the pulling ring, locking part, and guiding grooves, eliminating the need for motors, sensors, or control systems
3Ease of operation
If axial gap between tool and arbor is large, then tool installation is easier, but runout increases during operation
Solution Approach 1:
The locking part is designed to dynamically adjust its position along the tool surface after initial engagement. When the tool is inserted, the locking part moves axially to engage the tool surface, then the elastic component pushes it to conform to the tool's actual position, eliminating gaps and runout while maintaining easy installation through the guiding groove mechanism
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
Enables quick, efficient tool clamping and disassembly with reduced complexity, applicable to various tool types, enhancing usability in confined spaces and improving operational efficiency.
Implementation Method 1
The arbor main body is further provided with an elastic component, and the elastic component is used for pushing and pressing the locking part toward the notch
Implementation Method 2
The locking part is arranged within the first guiding groove, and the locking member extends from the notch into the assembling position and abuts against the tool within the assembling position
Data Source
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AI summary
Quick change arbor, which can realise quick replacements of tools such as drill bit, hole saw and batch head on electric drills. The quick change arbor comprises an arbor main body, a pulling ring and a locking part. The tool is positioned and installed in an assembling position through the arbor main body, and the locking part within the first guiding groove abuts against the surface of the tool, so that the tool is tightly locked within the assembling position, thus to effectively eliminate the gaps occurred after the tool is assembled.