Movable Core Chuck for Thin-Walled Cylinders
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Solution Overview
Problem
Thin-walled cylindrical workpieces experience strain and chattering during processing, leading to precision issues in roundness and concentricity, and the complexity and cost of dedicated chucks make precise processing challenging.
Innovation Solution
A workpiece retaining device with a core member, pressing member, and aligning member that applies uniform radial pressure to the workpiece, allowing the core member to move radially with the pressing force, ensuring concentricity and positional correction, thereby suppressing deformation and chattering during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dedicated chuck is designed for thin-walled workpieces, then processing precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The core member is designed to be movable in the radial direction rather than fixed, allowing it to dynamically adjust its position based on the workpiece geometry. This dynamic capability enables a simple chuck structure to achieve precise positioning of thin-walled workpieces without requiring complex dedicated fixtures
Solution Approach 2:
The system changes the positional parameter of the core member in the radial direction to adapt to variations in workpiece thickness and roundness. By allowing the core member to move radially, the chuck can accommodate different workpiece geometries while maintaining processing precision, eliminating the need for multiple dedicated chucks
2Device complexity
If thin-walled workpieces are chucked conventionally, then device simplicity is maintained, but strain and deformation occur during processing
Solution Approach 1:
The movable core member can dynamically adjust its radial position to accommodate thin-walled workpieces without applying excessive or uneven clamping forces. This prevents strain and deformation while maintaining structural simplicity, as the core member naturally adapts to the workpiece geometry during the clamping process
3Productivity
If the workpiece overhang length is increased, then productivity is improved by reducing chucking operations, but chattering occurs during processing
Solution Approach 1:
The movable core member provides dynamic support that adapts to the workpiece overhang condition. By allowing radial movement, the system can accommodate longer overhangs without generating chattering, as the core member adjusts to maintain optimal contact and support during processing, enabling single-chucking operations for improved productivity
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 precise processing of thin-walled cylindrical workpieces with one chucking operation, reducing the need for multiple processing steps and maintaining high precision without the complications of dedicated chuck structures.
Implementation Method 1
an aligning member that, upon a pressing force from the pressing member acting thereupon, allows the core member to move in the radial direction, in accordance with a magnitude and a direction of the pressing force
Data Source
AI summary
A device according to the present disclosure is a workpiece retaining device 10 that retains a retained portion 110 of an axial-directional end portion of a workpiece 100 that is cylindrical. The workpiece retaining device 10 includes a core member 32 that is round and that comes into contact an inner perimeter face of the retained portion 110 of the workpiece 100, a pressing member 33 that presses an outer perimeter face of the retained portion 110 of the workpiece 100 to an inner side in a radial direction, and an aligning member 44 that, upon a pressing force from the pressing member 33 acting thereupon, allows the core member 32 to move in the radial direction, in accordance with a magnitude and a direction of the pressing force.