How does the sander grind the material

How does the sander grind the material，The abrasive mill drives the grinding medium to shear, impact and friction with the material through the high-speed rotating dispersion disc, so that the material is gradually crushed and dispersed. Its efficient grinding capability makes it an essential device in a variety of industries, especially in production processes that require ultra-fine grinding an

 

How does the sander grind the material

The grinding process of the sand mill is achieved through the interaction between the grinding medium and the material, mainly relying on shear force, impact force and friction to grind the material to a super-fine or uniform particle state. Here are the detailed steps of how the sander grinds the material:

1. Selection and preparation of grinding media

The grinding medium used in the sanding machine can be ceramic beads, glass beads or metal beads, usually with higher hardness and density. The size and material of the medium will be selected according to the type of material, particle size requirements and process requirements.

2. The material enters the grinding chamber

The material to be ground is fed into the grinding chamber together with the grinding medium. The grinding chamber is a closed container filled with grinding media. When the sander is in operation, the material enters the grinding chamber by pumping or artesian flow.

3. High-speed rotation of the dispersion disk

The core of the sander is a high-speed rotating dispersion disc. The dispersion disc is driven by an electric motor to achieve very high speeds (usually thousands of revolutions per minute). The role of the dispersion plate is to drive the grinding medium and the material to form a high-speed flow, so that the grinding medium and the material produce a violent relative movement.

4. Shear force, impact force and friction

Under the high-speed rotation of the dispersion disc, the grinding medium collides with each other in the grinding chamber and constantly contacts the material. The grinding process involves the following main forces:

Shear force: The dispersion disc rotates at high speed, and the material is subjected to shear action between the grinding medium, resulting in dispersion and crushing effect. Shear forces can gradually tear larger particles apart into smaller ones.

Impact force: The grinding medium collides with the material in high-speed movement, and this impact force can quickly crush the coarse particles of the material into smaller particles.

Friction: The material is subjected to strong friction between the grinding medium, further reducing the particle size. This friction is especially important for materials that require ultrafine grinding.

5. Particle refinement and dispersion

With the extension of grinding time, the particles of the material are gradually refined under the action of the medium and fully dispersed at the same time. The particles in the material will be more and more evenly distributed among the media, achieving the desired fineness and dispersion.

6. Discharge material

When the material reaches the desired grinding fineness, the material is separated from the grinding medium through a screen or centrifugal separator. The screen ensures that only fine particles that are sufficiently ground can pass through, while larger particles are left in the grinding chamber to continue grinding.

7. Cycle grinding (optional)

In order to achieve higher grinding results, some sanders are designed as circulatory systems, that is, after passing through the grinding chamber once, the material can be sent back for repeated grinding until the desired particle size distribution is achieved.

Factors affecting grinding effect

The choice of grinding medium: the size, hardness and material of the medium have a great impact on the grinding effect. Smaller media are usually suitable for ultra-fine grinding, while harder media can handle materials that are more difficult to grind.

Material properties: The hardness, viscosity and initial particle size of the material all affect the grinding process. Harder materials require greater impact force, while high-viscosity materials may require longer grinding times.

Grinding time: The longer the grinding time, the finer the material particles. However, too long time may lead to excessive grinding, affecting the performance of the material.

The speed of the dispersion disc: the higher the speed of the dispersion disc, the greater the shear force and impact force, and the grinding efficiency will be improved, but too high a speed may increase energy consumption and equipment wear.

Sum up

The abrasive mill drives the grinding medium to shear, impact and friction with the material through the high-speed rotating dispersion disc, so that the material is gradually crushed and dispersed. Its efficient grinding capability makes it an essential device in a variety of industries, especially in production processes that require ultra-fine grinding and uniform dispersion.

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