Vibrating Screen Powder Distribution for Uniform Sheet Magnets
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Solution Overview
Problem
The sintering method for preparing NdFeB permanent magnet materials results in strong viscosity and poor fluidity of the magnetic powder, leading to uneven distribution and inconsistent performance in sheet-shaped magnets.
Innovation Solution
A powder distributing device and method that includes a mold with a screen, a powder feeding mechanism, and a vibrating mechanism to ensure uniform distribution of magnetic powder into mold cavities, improving powder density and consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If weighing method or volume method is adopted to take magnetic powder for molding, then the molding process can be performed, but large differences in mass of filling powder between different mold cavities occur, leading to poor product consistency
Solution Approach 1:
The patent applies mechanical vibration through a vibrating mechanism that drives the mold body to vibrate during the powder filling process. This vibration helps the magnetic powder distribute more uniformly across multiple mold cavities, reducing mass differences between cavities and improving product consistency while maintaining ease of operation
Solution Approach 2:
The patent employs periodic action through the vibrating mechanism that oscillates the mold body at specific frequencies during powder filling. This periodic vibration creates optimal conditions for powder flow and distribution, ensuring uniform filling across all mold cavities without complicating the molding process
2Adaptability or versatility
If mold cavities having large size are used, then the molding process can accommodate various powder amounts, but large differences in mass of filling powder between different mold cavities occur
Solution Approach 1:
The vibrating mechanism compensates for the variability inherent in large-sized mold cavities by applying vibration during powder filling. This ensures that even with large cavities designed for adaptability, the powder distributes uniformly, maintaining both versatility and manufacturing precision
3Ease of manufacture
If magnetic powder with strong viscosity is used, then the sintering method can be applied, but poor fluidity occurs, leading to uneven distribution of powder
Solution Approach 1:
The vibrating mechanism directly addresses the poor fluidity of viscous magnetic powder by applying vibration during the filling process. This vibration temporarily reduces the effective viscosity and enhances powder flow, enabling uniform distribution even with highly viscous materials used in sintering methods
Solution Approach 2:
The patent changes the physical state parameters of the magnetic powder during filling by applying vibration. This temporary parameter change improves fluidity during the critical filling phase, allowing viscous powder to distribute uniformly while maintaining the required viscosity for subsequent sintering processes
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 achieves improved uniformity of powder distribution, enhancing the performance and consistency of finished sheet-shaped magnets by ensuring even filling of magnetic powder in mold cavities.
Implementation Method 1
The vibrating mechanism is connected to the mold body and is configured to drive the mold body to vibrate. The mold body vibrates to drive the screen to vibrate.
Implementation Method 2
The driving piece is configured to drive the cam to rotate, and the cam rotates to drive the mold to vibrate up and down.
Data Source
AI summary
A powder distributing device for preparing sheet-shaped magnets and a powder distributing method thereof are provided. The powder distributing device includes a mold, a powder feeding mechanism, and a vibrating mechanism. The mold includes a mold body and a screen disposed above the mold and connected to the mold body. The screen sifts magnetic powder into at least one mold cavity of the mold body. The powder feeding mechanism feeds the magnetic powder to the screen. The vibrating mechanism is connected to the mold body The vibrating mechanism drives the mold body and the screen to vibrate together, so that the magnetic powder on the screen is evenly sifted into the mold body and filled to a predetermined density, which improves uniformity of powder distribution in the at least one mold cavity during a molding process, thereby improving performance and consistency of the sheet-shaped magnets.