Collet Bush Airflow Paths for Precise Tool Positioning
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Solution Overview
Problem
Existing tool driving devices with concentric collets face challenges in preventing wobbling while maintaining sufficient suction power for chip collection, as the gap between the collet bush and drill shank affects airflow and fitment.
Innovation Solution
A collet bush with a tapered outer surface for expanding the concentric collet, a cylindrical inner surface for slidably fitting tools, and dedicated airflow paths within the bush for chip suction, ensuring both secure positioning and effective chip collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gap between the collet bush and drill shank is made small to prevent wobbling, then positioning precision is improved, but suction power becomes insufficient
Solution Approach 1:
The invention divides the air flow path into multiple separate paths within the collet bush, allowing sufficient airflow for chip suction while maintaining a small overall gap between the collet bush outer surface and drill shank for positioning precision
Solution Approach 2:
The air flow paths are nested within the collet bush structure itself, with the paths formed between internal surfaces of the collet bush, allowing the external gap to remain small while internal flow paths provide adequate suction
2Productivity
If the gap between the collet bush and drill shank is made large to secure suction power, then chip collection capability is improved, but tool wobbling cannot be prevented
Solution Approach 1:
Multiple air flow paths are created within the collet bush, distributing the suction function across several channels, which maintains adequate total airflow while keeping the external dimensions compact for precise positioning
Solution Approach 2:
The air flow paths are positioned in the radial dimension within the collet bush structure, separating the suction function from the axial positioning function, allowing independent optimization of both gap size for positioning and flow path area for suction
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 solution prevents tool wobbling and maintains strong suction power, enhancing hole processing accuracy and avoiding chip clogging, particularly in materials like fiber-reinforced plastics and laminated metals.
Implementation Method 1
The outer surface is for expanding the concentric collet
Implementation Method 2
The flow path is for taking in air used for sucking the chips inside the collet bush
Data Source
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AI summary
A collet bush (10) includes a tapered cylindrical outer surface (22), a cylindrical inner surface (24) and a flow path (25). The collet bush is to be inserted into a concentric collet that is attached to a handheld tool driving device in order to position the tool driving device to a workpiece. The tool driving device holds, rotates and feeds a tool. The tool driving device has a function to suck chips. The outer surface (22) is for expanding the concentric collet. The inner surface (24) forms a through hole for slidably fitting the tool. The flow path (25) is for taking in air used for sucking the chips inside the collet bush. The tool driving device includes the above-mentioned collet bush and the concentric collet.