Analyze the principle of stone polishing and the grinding stone used
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After years of use of stone and its natural weathering, coupled with improper human care, it is easy to cause its natural color and brightness to disappear, which is unbearable; the cost of re-decoration is too high and the time is too long. The marble refurbishment process utilizes the chemical and physical functions in a very short period of time. It is restored to the original brightness by the grinding and polishing of the machine on the original basis. The color is natural and the brightness is 100%, which is economical and time-saving. The service life is more than five years.
First of all, there is an estimate of the cost of the project. If the cost is relatively low, the construction period is allowed, and the work of acceptance is relatively loose, ordinary grinding tools can be considered.
Due to the different occasions, purposes and processing techniques of stone use, when polishing non-glossy (rough-faced) plates of different specifications, abrasive brushes are currently used. The granularity number is from 36# to 500#, and the normal size is 36#46#, 60#, 80#. 46# abrasive grain size particle size is 425 ~ 355 (international standard ISO, Chinese standard GB2477-83), 80# is 212-180μm. Conventionally, the abrasive with a particle size of <63 μm is a fine powder, which is equivalent to the international standard 240#, China particle number W63. In China, it is generally believed that the fine powder of W28-W14 is used for fine grinding and rough polishing, and W10 is used for fine polishing and fine polishing. The basic particle size of W10 is 10-7 μm. 500# is also equivalent to China's W40, with a basic particle size of 40-28μm. In this way, the polishing of the rough stone by the abrasive brush is only equivalent to the rough polishing. This is when the polishing brush polishes the characteristics of the rough polished stone. In order to overcome the scratch on the stone, the hardness of the grinding tool should be soft, which is good for glazing. At the same time, in order to improve the gloss, it can be reduced. The amount of water, which increases the rotational speed of the machine, increases the temperature of the surface and also promotes the improvement of gloss. In short, the polishing of stone is a complex physical and chemical process, both physical micro-plowing and surface purification reactions, depending on the situation, is not the same.
The following are a variety of polished grindstone discs for marble, granite, ceramic tiles, etc.
1. Diamond bitumen grindstone, which is made of silicon carbide abrasive with magnesium oxide and magnesium chloride. The use of silicon carbide is better with green silicon carbide. Black silicon carbide is relatively cheaper. The granularity is generally from 16#--1200. #, The hardness of the grindstone produced is also from hard to soft. It is characterized by low cost, good self-sharpness, strong processing adaptability, and can process granite, marble, artificial stone, ceramic tile, etc., but the processing efficiency is compared. Low, the production cycle is relatively long, the grinding head needs a lot of pressure when working, it is a conventional grinding tool. After the grinding stone has a storage period of more than one year, various properties will change, such as self-sharpness, soft Hardness, etc.
2. A silicon carbide resin grindstone is formed by mixing and solidifying a silicon carbide abrasive and a resin, and is pressed with a phenol resin, and is mixed with a liquid resin to be poured. Mainly used in fine grinding, the pressing type is characterized by good durability and good wettability during grinding. Especially when processing marble, the grinding luminosity is good and the efficiency is relatively high, but the cost is relatively high, mainly with fine Granularity number, phenolic grindstone is easy to color when grinding light-colored stone, which is the main reason why it cannot be widely used. It is a fine-grained silicon carbide powder and other materials mixed with resin. The grindstone is the main means of applying granite, terrazzo and concrete polishing.
3. Ceramic grindstone, which is made of silicon carbide abrasive mixed with vitreous and sintered at high temperature. It is characterized by good durability, but it is easy to block, and the phenomenon of grinding and slipping occurs. The cost is also high, and it is used less now.
4. Metal bond grinding disc, which is made of diamond and metal powder. It is characterized by high processing efficiency and good processing effect. Generally, it is from 50#, and coarse grain size is 20#. It should be carefully selected. Otherwise, it will appear thicker. The scratches are difficult to process behind. In addition, the finest particle size used does not exceed 400#. This tool is used to trim rough surfaces and is the most effective tool to process satisfactory planes. The cost is relatively high. Said, to be higher, but the efficiency of its processing is unmatched by ordinary grindstones.
5. Resin bond grinding disc, which is made of diamond single crystal, fine powder and resin. It is characterized by lower cost than metal and high processing efficiency. It is mainly used for fine grinding of stone, to polishing, after metal grinding disc is smoothed. , continue grinding and polishing tools. The cost is moderate.
6. Diamond soft-grinding disc is a new type of tool used for ground refurbishment in recent years. Its lightness and unique flexibility make it have good bonding performance to the machined surface. It can provide the granularity from 20#---3000#. And BUFF black, white (polished). This kind of product uses diamond as the abrasive, which is light in weight and can effectively protect the soft part of the stone surface during grinding. The processed product has high gloss; the nylon gluing is used for connection and convenient operation. Its use, as well as a good upside.
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