Polishing technology and principle of natural stone
Publish Date:2020-08-17
The beauty of decorative stone is mainly reflected in the gloss of the product in addition to the color of the product. Therefore, the polishing of the product is a very important and critical link. How to polish the product to achieve the best effect, first of all, we must understand the polishing material, method and principle.The polishing materials are mainly chromium oxide (Cr2O3), white corundum (M1.0), alumina (Al2O3), and oxalic acid (COOH2).
There are generally two types of polishing grindstones: resin polishing block; resin polishing disc.
Product polishing: Put the polishing grindstone on the processed product, and use the mechanical equipment to quickly run and "dry polishing, wet polishing" to achieve the polishing effect. The surface of the product will appear strong reflected light, which is usually Said gloss.
The principle of polishing is mainly reflected in two aspects: particle grinding; physical chemistry.
1. Particle grinding: When the abrasive particles change from rough grinding to fine grinding then polishing, the marks on the surface of the stone from rough to fine to no visible marks, the surface will appear smooth, flat and delicate. When it reaches 110 microns, the processed surface appears mirror-like luster, with brilliance and bright color.
Particle grinding consists of the following processes:
¢ÙCoarse grinding: The grinding tool is required to have a deep knife, high grinding efficiency, rough grinding lines, and rough surface. It mainly removes the saw blade marks left by the product in the previous process and the flatness of the product , The modeling surface is ground in place;
¢ÚSemi-fine grinding: remove the traces of rough to finer lines, and the processing surface is flat and smooth;
¢ÛFine grinding: The pattern, particles and color of the product after the fine grinding have been clearly displayed, the surface is fine and smooth, and there is a weak gloss;
¢ÝPolishing: The surface is bright as a mirror, with a certain degree of mirror gloss (above 85 degrees).
2. 2. Physical and chemical principles: There are two polishing processes, namely "dry polishing and wet polishing". The polishing grindstone has physical and chemical interaction with the stone product between "dry and wet".Dry polishing is when the surface temperature of the stone rises to evaporate the water, which causes the concentration of the polishing grindstone to increase, so as to achieve the strengthening effect. The gloss of the product begins to meet the ideal requirements, and the gloss is above 85 degrees or higher.
The polishing grindstone is polished on the processed product. After the polished product is hot, add water to the surface of the board to cool down. Continuous or large amounts of water are not allowed. Otherwise, the lubrication of water will make the polishing unable to reach For ideal results, dry polishing cannot be used at all. Excessive temperature will burn the surface and cause cracks on the surface.
Generally speaking, after the product is fine grinding, the gloss of the product is about 40~50, and some stones cannot reach the above gloss, such as Shanxi black, black gold sand, Jining black, etc., which only between 20 and 30 degrees, it is not enough to explain the principle of the previous particle grinding. This product is in the polishing "dry and wet", the temperature rises, and the temperature is reduced. The polishing process is strengthened and the physical and chemical reaction occurs. After the product undergoes "dry polishing and wet polishing", the gloss gradually increases, and the gloss reaches over 85 degrees.
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