Sanding and polishing machines are high-efficiency grinding and surface treatment equipment widely used in industry, mainly for ultrafine grinding and dispersion of materials as well as workpiece surface polishing. They are extensively applied in industries such as coatings, cosmetics, electronic materials, pharmaceuticals, food, and metalworking.
I. Working Principle and Types
- A sand mill uses a high-speed rotating rotor to drive grinding media (e.g., zirconia beads, glass beads) to generate strong shear force, impact and friction, effectively crushing material particles and dispersing them uniformly. This process usually takes place in a closed chamber, with a cooling system to control temperature and ensure grinding stability.
- Vertical Sand Mill
- Suitable for laboratory use or small-batch production, featuring high grinding fineness and easy operation. For example, vertical ultra-nano sand mills dedicated to carbon nanotubes can achieve ultrafine grinding down to 0.1 μm, ideal for fine processing of nanomaterials and cosmetic raw materials.
- Horizontal Sand Mill
Offers strong continuous production capacity and excellent heat dissipation, suitable for large-scale industrial applications such as the preparation of paints, inks, and lithium battery materials. - Sandblasting Polishing Machine
- Uses compressed air to propel abrasives (e.g., emery) at high speed onto workpiece surfaces to remove burrs, oxide layers, or roughen surfaces. It is commonly used for surface finishing of dental prosthetics and metal castings.
II. Core Functions and Application Scenarios
1. Fine Grinding and Dispersion
Capable of processing liquid-solid mixtures; even water-insoluble substances (e.g., titanium dioxide, iron oxide red) can be ground efficiently, depending on the selection of appropriate grinding media and process parameters.
Applied in cosmetic raw materials, pharmaceutical micropowders, food slurries and other fields to improve product texture and stability.
2. Surface Polishing and Deburring
Sandblasting polishers can uniformly treat workpieces with complex shapes (e.g., inner holes, threads) without mechanical contact damage.
Electropolishing, based on electrochemical principles, preferentially dissolves micro-protrusions on metal surfaces to achieve a mirror-bright finish without altering geometric dimensions.
3. Automation and Intelligent Control
Modern equipment is equipped with a real-time monitoring system, allowing adjustable parameters such as grinding time (adjustable 0–999 minutes), rotating speed (500–3000 rpm), and temperature to ensure process consistency.
