Collet Bush Airflow Grooves for Stable Tool Positioning
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Solution Overview
Problem
Existing handheld tool driving devices with concentric collets face challenges in preventing tool wobbling while maintaining sufficient suction power for chip collection, as the gap between the collet bush and drill affects airflow, leading to either insufficient suction or improper fit.
Innovation Solution
A collet bush with a tapered cylindrical outer surface for expanding the concentric collet, a cylindrical inner surface for slidably fitting tools, and dedicated air flow paths within the bush for chip suction, allowing for both secure tool positioning and effective chip collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the gap between the collet bush and drill is reduced to prevent wobbling, then tool positioning stability is improved, but the air flow path is narrowed and suction power becomes insufficient
Solution Approach 1:
The air flow path is segmented into multiple channels by providing plurality of air flow path forming grooves on the outer peripheral surface of the collet bush. This segmentation allows the air flow path to be separated from the tool shank fitting space, enabling independent optimization of both tool stability (through tight fit) and suction capability (through dedicated air channels).
Solution Approach 2:
The air flow path is moved from the radial gap dimension to the axial groove dimension on the outer peripheral surface. By forming grooves on the outer surface rather than relying on the internal gap, the air flow path utilizes a different spatial dimension, allowing the internal gap to be minimized for stability while maintaining adequate air flow channels on the exterior.
2Quantity of substance
If the gap between the collet bush and drill is increased to secure suction power, then air flow quantity is improved, but the drill cannot slidably fit and tool wobbling cannot be prevented
Solution Approach 1:
The functional spaces are segmented into distinct regions: the internal cylindrical space for tool shank fitting and the external groove features for air flow. This segmentation allows the internal gap to be minimized for precise tool fitting while the external grooves provide dedicated air flow channels independent of the internal fit clearance.
3Manufacturing precision
If a concentric collet is used for positioning, then tool positioning accuracy is improved, but the air flow path for chip suction becomes insufficient
Solution Approach 1:
The air flow path is relocated from the internal radial dimension to the external axial dimension on the collet bush surface. By forming grooves on the outer peripheral surface, the air flow channels utilize the external surface geometry rather than the internal fitting space, enabling both precise internal fitting and adequate external air flow paths.
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
Prevents tool wobbling and ensures robust chip suction, maintaining hole processing accuracy and avoiding clogging, especially 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 inner surface forms a through hole for slidably fitting the tool
Implementation Method 3
The flow path is for taking in air used for sucking the chips inside the collet bush
Data Source
AI summary
A collet bush includes a tapered cylindrical outer surface, a cylindrical inner surface and a flow path. 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 is for expanding the concentric collet. The inner surface forms a through hole for slidably fitting the tool. The flow path 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.