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Classification and development of abrasive tools
- Jul 07, 2018 -

A grinding tool is a tool for grinding, grinding, and polishing. Most abrasives are artificial abrasives made from abrasive and combination agents. They are also natural abrasives made from natural rock. Abrasive except in mechanical manufacturing and other metal processing industry is widely accepted, are also used in food processing, papermaking industry and ceramics, glass, stone, plastic, rubber, wood and other nonmetal material processing.


Abrasive tool in use process, when the abrasive grinding dull, due to the grits his part fracture or joint fracture, abrasive from the abrasive on the partial or complete loss, and abrasive abrasive on the surface of the things is always something new cutting edge, or constantly exposing new sharp abrasive, abrasive cutting performance in a certain time internal energy links. This self - sharpening of the grinding tool is a prominent feature of the grinding tool and the same common tool.


According to its material source, there are two types of grinding tools: natural and artificial. The only natural abrasives commonly used in the mechanical industry are oilstones. According to the basic shape and layout characteristics of artificial abrasives, there are five types of grinding wheels, grinding heads, whetstones, sand tiles (collectively referred to as condensing abrasives above) and coated abrasives. In addition, abrasives are customarily classified as abrasives.


According to the difference of abrasive materials used, the coagulation grinding tools can be divided into ordinary abrasive coagulation grinding tools and super-hard abrasive coagulation grinding tools. The former is made of corundum and silicon carbide, while the latter is made of diamond and cubic boron nitride. Other, there are some special varieties, such as sintered corundum grinding tools.


Ordinary abrasive coagulative grinding tool is a kind of grinding tool which combines ordinary abrasive material into definite shape and has definite strength. The same is usually composed of abrasive, combined agent friendly hole, these three departments are often called the three elements of the coagulation tool.


The abrasive cuts in the tool. A combination agent is a material that condenses loose abrasive into a abrasive tool, both inorganic and organic. The inorganic compounds include ceramics, rhombic acid and sodium silicate. Organic resin, rubber and shellac. The most commonly used combination is ceramic, resin and rubber.


When grinding, the stoma ACTS as a chip carrier and a chip remover, and can hold the cooling fluid, which is conducive to the dissipation of grinding heat. In order to satisfy certain special processing requirements, some additives, such as sulphur yellow and paraffin wax, can be impregnated into the pores to improve the performance of the abrasive tools. This additive is also called the fourth element of the abrasive tool.

The items that characterize ordinary abrasive clotting grinders are: shape, size abrasive, particle size, hardness, construction, and combination agent. The hardness of the abrasive tool refers to the degree of difficulty for the abrasive particles to fall off the surface of the abrasive tool under the action of external forces.


The hardness of the grinding tool depends on the amount of the combination agent and the density of the grinding tool. On the contrary, it shows high hardness. As usual, hardness levels are classified into super soft, soft, medium soft, medium, medium hard, hard and super hard grades. More commonly used methods for measuring the hardness of abrasive tools are hand taper, mechanical taper, rockwell hardness tester and sand blast hardness tester.


The hardness of the grinding tool has a corresponding relation with its dynamic elastic modulus, which is helpful for measuring the dynamic elastic modulus of the grinding tool by audio method. In the grinding process, if the material hardness of the grinding parts is high, the grinding tools with low hardness are usually selected. Conversely, the use of high hardness of grinding tools.


The rough structure of abrasive tools can be divided into three types: precision, medium and loose. Each class can be further subdivided and so on, with the construction number to distinguish. The larger the structure number of the grinding tool, the smaller the volume percentage of the abrasive in the grinding tool, the wider the gap between the abrasive particles, and the looser the structure. Conversely, the smaller the number, the tighter the structure. The abrasive tool with loose structure is not easy to be passivated when it is used, and less heat is generated in the process of grinding. The abrasive particles of the grinding tool with a compact structure are not easy to fall off, which is beneficial to the shape of the connecting tool. The structure of the abrasive tool is controlled only in accordance with the grinding tool formula during manufacture.