Magnetic Polishing Machine Uniformity via Segmented Rotation
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Solution Overview
Problem
Magnetic polishing machines face limitations in polishing unevenness due to the restricted magnetic force of magnet discs, particularly at the center portion and near the rotation axis, where centrifugal forces from high-speed rotation complicate the polishing process.
Innovation Solution
The magnetic polishing machine employs multiple rotatable plates with magnets positioned to overlap partially, allowing polishing pieces to be influenced by magnetic forces while minimizing centrifugal effects, ensuring uniform polishing across the entire surface, including the center and axis regions, through a combination of rotation mechanisms and strategically placed magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnet disc is used for polishing, then the structure is simple, but polishing unevenness occurs in the center portion and near the rotation axis
Solution Approach 1:
The single magnet disc is segmented into multiple magnet discs (first magnet disc and second magnet disc) with different rotation speeds. Each magnet disc creates its own magnetic field zone, and the overlapping zones ensure that even areas experiencing centrifugal force from one disc are covered by the magnetic field of another disc, eliminating polishing unevenness while maintaining reasonable structural complexity
Solution Approach 2:
The system employs dynamic differentiation by rotating the first and second magnet discs at different speeds (different number of revolutions per minute). This dynamic approach creates time-varying magnetic fields that interact to polish all areas uniformly, including the center portion and regions near the rotation axis that would otherwise be affected by centrifugal force
2Productivity
If the magnet disc is rotated at high speed to increase productivity, then polishing efficiency improves, but centrifugal force makes it difficult to polish the center region
Solution Approach 1:
The polishing function is segmented across multiple magnet discs rotating at different speeds. The first magnet disc rotates at a higher speed for efficient polishing of outer regions, while the second magnet disc rotates at a different speed to provide magnetic field coverage in the center region and near the rotation axis, counteracting centrifugal force effects
Solution Approach 2:
The system changes the rotational speed parameter of different magnet discs to optimize polishing performance. By setting different number of revolutions per minute for the first and second magnet discs, the magnetic field distribution is optimized to maintain polishing effectiveness across all regions including the center, while allowing high-speed rotation for overall 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
This configuration effectively suppresses polishing unevenness by ensuring consistent polishing across the entire surface, including the center and axis regions, while maintaining a compact machine design.
Implementation Method 1
a magnet is attached to the rotation plate... the polishing pieces polish the polishing target while being influenced by the magnetic force of each rotation plate
Implementation Method 2
when the magnet disc is rotated at a high speed, the polishing piece rotates at high speed about the rotation axis of the magnet disc and hence a centrifugal force is applied to the polishing piece
Data Source
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AI summary
A magnetic polishing machine includes a container 2 which accommodates a polishing target and a plurality of polishing pieces, a plurality of rotation plates 5 which are rotatably disposed below the container 2 while a magnet 7 is attached to the rotation plate, and a first rotation mechanism 6 which rotates each rotation plate 5 about a rotation axis A1 of the rotation plate 5. In this way, since the plurality of rotation plates 5 are disposed below the container 2, the polishing pieces in the entire container 2 are mixed by a centrifugal force of the polishing piece with the rotation of each rotation plate 5. For this reason, it is possible to suppress a decrease in amount of the polishing target also above a center portion of each rotation plate 5 and in the vicinity of the rotation axis A1 of each rotation plate 5. Accordingly, it is possible to suppress polishing unevenness.