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Abrasive manufacturing and works

Time:2012.05.23 News sources:Yangzhong Hongtu Grinding Tools Co.,Ltd. Browse the number:

The abrasive is used for grinding, grinding and polishing tools. Most of the abrasive is coupled with abrasive binders made of artificial abrasive, it also uses natural mineral rock directly processed into natural abrasive. Abrasives are widely used in machinery manufacturing and metal processing industries, but also for the processing of food processing, paper industry, ceramics, glass, stone, plastic, rubber, wood and other non-metallic materials.

    Abrasive during use, when the abrasive grinding blunt, abrasive part of its own fragmentation or binder fracture, abrasive from the abrasive on the partial or complete loss of the abrasive surface abrasive emerging new cutting edge, or continuously exposing new sharp abrasive abrasive to maintain cutting performance within a certain time. Abrasive compared to the prominent feature of this self-sharpening, abrasive and tool.

    As early as the Neolithic period, humans have begun to apply the natural grindstone to process the stone knives, stone axes, bone, horn and teeth and other tools; 1872, appeared in the U.S. the combination of natural abrasive and clay firing ceramic grinding wheel; 1900, artificial abrasive advent of artificial abrasives manufacturing abrasive have produced to create the conditions for the rapid development of the grinding and grinding. Since then, the natural abrasive in the abrasive in the proportion of reduced gradually.

    The abrasive according to their raw material source, there is a natural abrasive and the two types of artificial abrasive. The natural abrasive machinery industry only Whetstone. Artificial abrasive basic shape and structural features to distinguish between the grinding wheel, grinding wheel, stone, sand tile (collectively, the consolidation of the abrasive) and coated abrasives five. In addition, it is customary abrasive as the abrasive.

    Bonded Abrasives by different abrasive can be divided into ordinary abrasive bonded and superabrasive abrasive products. Former ordinary abrasive such as corundum and silicon carbide, which is made of diamond and cubic boron nitride and other superhard abrasive. In addition, there are some special varieties, such as sintered alumina abrasive.

    Ordinary abrasive Bonded Abrasives binder ordinary abrasive solid to form a certain shape, and has a certain strength of the abrasive. General abrasives, binders and stomatal constitute the three parts is often referred to as the three elements of the abrasive products.

    Abrasive from the abrasive in the cutting action. Binder is loose abrasive solid to form the abrasive material, inorganic and organic categories. Inorganic binder ceramics, magnesite and sodium silicate; organic resin, rubber and shellac. One of the most commonly used ceramic, resin and rubber binder.

    Wear debris from the pores in the grinding of Chip and chip effects, and can accommodate the coolant helps grinding heat dissipation. To meet some special processing requirements, the pores can also impregnated some fillers, such as sulfur and paraffin, in order to improve the use of abrasive performance. Such fillers, also known as the fourth element of the abrasive.

    Said ordinary abrasive abrasive products characteristics: shape, size, abrasive, grain size, hardness, organizations and binders. Abrasive hardness of the abrasive in the external force, ease off from the abrasive surface, it reflects the strength of a binding agent to control abrasive.

    The hardness of the abrasive depends largely on the amount of binder and abrasive density, and abrasive come off easily, said low abrasive hardness; the contrary, that the high hardness. The hardness level is generally divided into super-soft, soft, soft, hard, hard and superhard seven level, these levels can also be subdivided into a number of small class. Determination of abrasive hardness, the more commonly used hand cone method, the method of mechanical cone, Rockwell Hardness Determination and sandblasting hardness determination method.

    The hardness of the abrasive and its dynamic modulus of elasticity has a corresponding relationship, which is conducive to the determination of the dynamic elastic modulus of the abrasive tone method to represent the abrasive hardness. In grinding, if the grinding of the workpiece material hardness is high, generally used in low hardness of the abrasive; the contrary, the selection of the high hardness of the abrasive.

   Abrasives organization roughly divided into close, medium and loose three categories. Each category can be subdivided into a number, etc., to distinguish the organization number. Abrasives organization, the greater the number, the smaller the percentage of the volume occupied by the abrasive in the abrasive, the wider the gap between the abrasive, said the organization is looser. On the contrary, the organization number the smaller the organization is more tightly. Difficult to passivation than the loose organization of abrasive used in grinding process less heat, can reduce the heat deformation of the workpiece and burns. The tight organization of the abrasive grits is not falling, is conducive to maintaining the geometry of the abrasive. The organization of the abrasive only be controlled at the time of manufacture by the abrasive formula, generally do not make the determination.

    The superabrasive abrasive products is formed by the diamond, cubic boron nitride and the binder solid abrasive. Due to the high price of diamond, cubic boron nitride, with good wear resistance, abrasive products manufactured with them with ordinary abrasive abrasive products, except superabrasive layer, transition layer and matrix.

    Superabrasive layer from the cutting action part consists of superabrasive and bond. Matrix from grinding care role, composed of metal, bakelite, or ceramic materials. Transition layer used to connect the substrate and superabrasive layer by the binder composition, and sometimes can be avoided. Commonly used in the binder resin, metal, electroplating, metal and ceramic.

    The abrasive products of the manufacturing process: the distribution of materials, mixing, forming, heat treatment, machining and inspection. With different binders, the manufacturing process are not the same. Vitrified-pressure method, abrasives and binders according to the formula of the weight ratio of weighing, placed in the mixer mixed, put into a metal mold in the press molding abrasive rough. Rough dried and then loaded into the kiln calcination, sintering temperature of 1300 . When the use of low melting point Shaorong binder, sintering temperature below 1000 C. Then the provisions of the size and shape of the accurate processing, and finally check the product.

    Resin bonded abrasives at room temperature press forming, pressure in the heating conditions below the heating side of the hot pressing process. Hardening after forming in the hardening furnace. Phenolic resin as the binder, the curing temperature of 180 ~ 200 .

    Rubber bonded abrasives used mainly roll machine mixing, rolling and molding into thin slices, then use the red knife blanking; some loose material put into the inner metal mold press forming. Forming curing in the curing tank, the temperature is 165 to 180 .

    Metal bonded abrasives manufacturing powder metallurgy and plating, mainly for superabrasive abrasive products. Powder metallurgy of bronze and other binders, mixing by hot pressing or compression molding at room temperature and then sintering processing. Plating with nickel or nickel-cobalt alloy plating metal plating process abrasive consolidation in the substrate made of abrasive.

    Special varieties of grinding sintered corundum abrasive and fiber abrasive. Sintered alumina abrasive is alumina and the amount of chromium oxide mixed, forming, sintering at about 1800 . This abrasive compact structure, higher strength, mainly used for processing clocks, instruments and other parts. Fiber abrasive made for raw materials containing or adhesion of abrasive filaments (such as nylon yarn), its good elasticity, and is mainly used for the polishing of metal materials and products.

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