Barrel Polishing Rotary Disk Convex Portion Gap Control
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Solution Overview
Problem
In barrel polishing apparatuses, the expansion of linings due to temperature increases narrows the gap between the fixed tank and the rotary disk, leading to potential welding and non-rotatability issues with the rotary disk.
Innovation Solution
A barrel polishing apparatus design featuring a convex portion on the rotary disk that overlaps the gap, restricting the expansion of the lining in the outer circumferential direction and allowing expansion primarily in the axis direction, thereby reducing the gap width change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the small gap portion is increased to accommodate lining expansion, then the reliability of continuous operation is improved, but the manufacturing precision for small workpieces deteriorates due to difficulty in polishing small workpieces
Solution Approach 1:
The invention redirects the expansion direction of the second lining from the radial direction (affecting gap width) to the axial direction (parallel to rotation axis) by providing a convex portion on the rotary disk. This dimensional redirection allows the gap width to remain small for polishing precision while accommodating lining expansion in the axial dimension, thus resolving the contradiction between reliability and manufacturing precision.
2Manufacturing precision
If the width of the gap is reduced to enable small workpiece polishing, then the manufacturing precision for small workpieces is improved, but the reliability deteriorates due to potential welding and non-rotatability
Solution Approach 1:
The convex portion on the rotary disk creates a physical barrier that redirects thermal expansion of the second lining into the axial dimension rather than allowing it to reduce the radial gap width. This enables maintaining a small gap for precision workpiece polishing while preventing welding and ensuring continuous operation through expanded accommodation space in the axial direction.
3Reliability
If the lining layer is allowed to expand freely, then the reliability is improved by preventing welding, but the manufacturing precision deteriorates due to gap width narrowing
Solution Approach 1:
The convex portion is strategically positioned on the rotary disk to locally restrict expansion of the second lining in the radial direction while permitting axial expansion. This localized quality change creates different expansion characteristics in different regions and directions, preventing welding while maintaining precise gap width control for manufacturing accuracy.
Solution Approach 2:
The convex portion redirects the expansion freedom from the radial dimension (gap width direction) to the axial dimension, allowing the lining to expand without reducing the gap width. This enables simultaneous achievement of welding prevention and gap width control for manufacturing precision.
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 design effectively reduces the amount of change in the gap width due to lining expansion, preventing welding and ensuring continuous operation, while also allowing for the polishing of smaller workpieces without risk of being caught in the gap.
Implementation Method 1
when the temperature in the polishing space is increased by polishing the workpiece for a long time, the linings of the fixed tank and the rotary disk thermally expand
Data Source
AI summary
A barrel polishing apparatus according to an aspect includes a fixed tank and a rotary disk that define a polishing space. The fixed tank has a predetermined axis as a center axis. The fixed tank includes a cylindrical rigid body and a first lining covering an inner circumferential surface of the cylindrical rigid body. The rotary disk has a disk-shaped rigid body and a second lining covering a surface of the disk-shaped rigid body on the polishing space side, and is rotatably disposed in a state where a gap is formed between the first lining and the second lining. The disk-shaped rigid body has a convex portion protruding toward the polishing space along a predetermined axis direction. The length in the predetermined axis direction of the part overlapping the gap of the convex portion is one-third or more of the length in the predetermined axis direction of the gap.