Analyze the abrasives and grinding tools required for ground decorative stone grinding

With the development of the economy, the use of stone is becoming increasingly widespread, especially in various public places. Stone is loved by people for its elegant and luxurious appearance. Over time, its use may experience aging and pollution, which can be initially solved through cleaning methods. However, sometimes renovation must be achieved through grinding. The following is an introduction to abrasives and grinding tools to give everyone a preliminary understanding of this.

1、 Classification of abrasive materials:

Abrasive is a material used for grinding and processing, currently classified into two types: ordinary abrasive and superhard abrasive;

1. Ordinary abrasive

Ordinary abrasives mainly include (1) corundum type (brown corundum, white corundum, etc.), whose main chemical composition is Al2O3 (aluminum oxide), and (2) silicon carbide type (black silicon carbide, green silicon carbide), whose main chemical composition is SiC (silicon carbide). Their hardness is brown corundum, with a microhardness of 2000-2200 kgf/mm2; White corundum, microhardness 2200-2300 kgf/mm2; Black silicon carbide, microhardness 3100-3300 kgf/mm2; Green silicon carbide, microhardness 3200-3400 kgf/mm2; The particle size ranges from 4 # to fine powder W0.5 (even finer), and the order of hardness can be sorted as follows: green silicon carbide and black silicon carbide are used for processing granite, white corundum (soft) and black and green silicon carbide (hard) are used for processing marble; In terms of material cost, green silicon carbide, black silicon carbide, and white corundum can be used to produce inorganic grinding tools, including rhodochrosite and ceramics; Organic grinding tools, including phenolic resins, unsaturated resins, and epoxides (including sandpaper), constitute the grinding tools for ordinary abrasives.

2. Superhard abrasive

Diamond abrasive belongs to the category of superhard abrasive. Although its processing history is relatively long, it has been widely used in industrial production over the past thirty years, with a microhardness of 8000-10000 kgf/mm2; Hardness is * * *, and the mechanism of micro cutting is used to process materials, making it a * * * cutting tool. In recent years, its production has increased significantly and industrial costs have decreased. It has high processing efficiency (more than 5 times that of ordinary) and good processing effect (can polish materials with high requirements). Therefore, its application is becoming increasingly widespread. Diamond grinding tools mainly include metal, resin, ceramic, etc., which are classified according to the type of binder. Metal grinding tools mainly include iron-based, copper based, cobalt based, etc., which determines the processing cost of different types of materials. As a grinding tool, its particle size ranges from coarse (20 #) to fine (400 #); Its characteristic is a long service life, but the cost will be higher. Resin based grinding tools, due to their relatively low production costs, have more applications. They are currently also used for rough grinding and polishing, and their advantage lies in fine-grained grinding and polishing; Ceramic diamond grinding tools are rapidly developing tools in recent years. In terms of processing performance, they take the advantage of metal processing and avoid the disadvantage of resin processing, with good technical advantages. However, due to their cost, they have not yet been used in stone renovation.