Polishing can be divided into rough polishing, medium polishing, and fine polishing. Rough polishing is the process of polishing a surface with or without a hard wheel, which has a certain grinding effect on the substrate and can remove rough marks. Mid polishing is the further processing of rough polished surfaces using harder polishing wheels. It can remove scratches left by rough polishing and produce a moderately shiny surface. Fine polishing is the final process of polishing, using a soft wheel to polish and obtain a mirror like bright surface. It has little grinding effect on the substrate.
Ⅰ. Polishing wheel
Polishing wheels are made of different fabrics, and their structural forms mainly include the following:
1. Stitching type: It is made by sewing cloth pieces together. The stitching methods include concentric circle, radial, radial arc, spiral, square, etc. According to the different sewing densities and fabrics, polishing wheels with different hardness can be made, which are mainly used for rough polishing.
2. Non sutured: It has two types: disc type and wing type. All are assembled into soft wheels using cloth sheets, specifically designed for precision polishing. Wings have a longer service life.
3. Folding: It is formed by folding round cloth pieces in two or three folds to form a "bag shape", and then alternately stacking them on top of each other. This polishing wheel is easy to store polishing agents, has good elasticity, and is also conducive to air cooling.
4. Wrinkle type: Cut the fabric roll into 45 angled strips, sew them into continuous, biased rolls, and then wrap the roll around a grooved cylinder to form a wrinkled shape. The center of the wheel can be embedded with cardboard to enable the wheel to fit with the machine shaft. Steel wheels with ventilation can also be installed (this form is better). The characteristic of this polishing wheel is good heat dissipation, suitable for high-speed polishing of large parts.
Ⅱ. Polishing agent
1. Polishing paste
Polishing paste is made by mixing polishing abrasive with adhesive (such as stearic acid, paraffin, etc.) and can be purchased in the market. Its classification, characteristics, and uses are shown in the following figure.
|
Type |
Characteristics |
Purposes |
| White polishing paste
|
Made of calcium oxide, magnesium oxide, and adhesive, with small particle size but not sharp, prone to weathering and deterioration when stored for a long time |
Polishing softer metals (aluminum, copper, etc.) and plastics material, also used for precision polishing |
| Red polishing paste |
Made of iron oxide, oxidized spoon, and adhesive, etc, Moderate hardness |
Polishing general steel parts, for aluminum, copper and other partsRough throwing of items |
|
Green polishing paste |
Using materials such as Fe2O3, alumina, and adhesives made with strong grinding ability | Polishing hard alloy steel, road layer, stainless steel |
2. Polishing solution
The polishing abrasive used in the polishing fluid is the same as that used in the polishing paste, but the former is used at room temperature in a liquid oil or water emulsion (flammable materials should not be used) to replace the solid adhesive in the polishing paste, resulting in a liquid polishing agent.
When using polishing solution, it is sprayed onto the polishing wheel by a pressurized supply box, a high-level supply box, or a pump with a spray gun. The pressure of the feeding box or the power of the pump is determined by factors such as the viscosity of the polishing solution and the required supply amount. Due to the constant supply of polishing solution as needed, wear on the polishing wheel can be reduced. It will not leave too much polishing agent on the surface of the parts and can improve production efficiency.
Post time: Nov-29-2024
