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Common types of processing tools and working principle of abrasive Introduction

    Abrasives are used for grinding, grinding and polishing tools. Most of the abrasive is made of abrasive man-made binder with abrasive, but also useful for processing of natural ore directly into the natural abrasive.

    In addition to grinding and other metalworking machinery manufacturing industry has been widely used, but also for food processing, drawer slides paper and ceramics, glass, stone, plastic, rubber, wood and other non-metallic materials processing.

    Abrasive in use, when the abrasive blunt, because the grain itself part of the fracture fragments, or combination of agents, abrasive from the abrasive on the partial or complete loss, while the abrasive surface of the abrasive work of emerging new cutting edge, or continuously exposing new sharp abrasive, so abrasive in a certain period of time to maintain the cutting performance. This self-sharpening abrasive, is abrasive,drawer runner compared with the general prominent feature of the tool.

    As early as the Neolithic Age, human beings have begun the use of natural millstone processing knives, axes, bone, horn, etc. devices, and dental tool; in 1872, appeared in the U.S. using a combination of natural abrasive and clay firing ceramic wheel; 1900, the advent of artificial abrasives, synthetic abrasives manufactured using a variety of abrasives have been produced for grinding and grinding machines to create the conditions for rapid development. Since then, the natural abrasive in abrasive proportion gradually decreased.

    Abrasives source of their raw materials, there are two kinds of natural abrasive and abrasive man-made. Commonly used in machinery industry is only natural abrasives Whetstone. The basic shape and abrasive man-made structure by distinguishing, with grinding wheel, grinding head, Whetstone, sand tile (collectively Bonded Abrasives) and five types of coated abrasives. In addition, the abrasive is also used as a class of abrasives.

    Bonded Abrasives Abrasive used by different abrasive products can be divided into ordinary and super-hard abrasive abrasive abrasive products. Corundum and silicon carbide former such as abrasive, the latter with a diamond and cubic boron nitride and other superhard abrasive made. In addition, there are some special varieties, such as sintered alumina abrasive and so on.

    Abrasive is bonded abrasive products abrasive solid form to a certain general shape and has a certain strength of the abrasive. Generally abrasive, bond and porosity structure, often called the three parts of the three elements of abrasive products.

    Abrasive in the abrasive cutting action in the play. Binder is to form a loose abrasive grinding solid materials, there are two types of inorganic and organic. Inorganic ceramic binder, magnesite and sodium silicate; organic with resin, rubber and shellac and so on. One of the most commonly used is the ceramic, resin and rubber bond.

    Pores in the grinding of the wear debris from the role of Chip, and Chip, and can accommodate the cooling fluid, helps to grinding heat dissipation. To meet some special processing requirements, can also be impregnated within the pores of certain fillers, such as sulfur and paraffin, so as to improve abrasive performance. Such fillers, also known as the fourth element of abrasive.

    Said abrasive abrasive characteristics include: shape, size abrasive, grain size, hardness, structure and binding agent. Grit abrasive hardness is under external force, from the ease of grinding off the surface, it reflects the bond strength of particle control.

    Abrasive hardness depends on the amount of binder and abrasive by adding the density of abrasive grains easily fall off of that low hardness; the contrary, that high hardness. Hardness level is generally divided into super-soft, soft, medium soft, medium, medium hard, hard and superhard seven levels, from these levels can also be subdivided in a number of small magnitude. Abrasive hardness measurement method, more commonly used hand-cone method, mechanical cone method, Rockwell hardness measurement method and blasting method.

    Abrasive hardness and its dynamic elastic modulus with the corresponding relations, which is conducive to the abrasive tone method to represent the dynamic elastic modulus of abrasive hardness. In the grinding process, if they are grinding the workpiece material hardness, generally used in low hardness of the abrasive; the other hand, the hardness of the abrasive used.

    Abrasives close of crude into the middle and loose categories. The number of each type can be further subdivided so on, with numbers to distinguish between organizations. Organization, the greater the abrasive, abrasive in the abrasive volume percentage share of the smaller, wider gap between the abrasive that the more loose organization. Conversely, the smaller the organization, said organization No more tight. Loose organization of the abrasive used is not easy passive, less heat in the grinding process, can reduce the workpiece deformation and heat burns. Tight organization of the abrasive grain easy to fall off, helps maintain the geometry of abrasive. The organization only in the manufacture of abrasive when the formula to be controlled by abrasive, generally not as determined.

    Bonded Abrasives Abrasive mainly by the diamond, cubic boron nitride and other solid form with the combination of the abrasive agent. As diamond, cubic boron nitride high price, with good wear resistance, abrasive products made with them with different abrasive abrasive materials, in addition to super-hard abrasive layer, there are transition layer and matrix.

    Abrasive cutting action layer is the part played by the super-hard abrasive and bond composition. Matrix is ??supporting for the grinding role played by the metal, bakelite, or ceramic material composition. Transition layer for connecting the substrate and superhard abrasive layer, constituted by the binder, and sometimes can be avoided. Are commonly used binder resin, metal, plating metal and ceramics.

    Bonded Abrasives manufacturing processes are: distribution of materials, mixing, forming, heat treatment, processing and inspection. With the combination of agents is different manufacturing processes are not the same. Vitrified bond mainly-pressure method, the abrasive and bonding agent ratio by weight of formula, after weighing, mixing machine placed evenly mixed into the metal mold, forming the abrasive in the press on the blank. Rough kiln dried and then into the roasting, sintering temperature is generally about 1300 ℃. When using low melting point Shaorong binder, the sintering temperature below 1000 ℃. Precise shape of the required size and then processing, final inspection products.

    Resin bonded abrasives are generally at room temperature in the press molding, there is also heated in the heating side of pressure below the hot pressing process. Hardening furnace hardened after forming. With phenolic resin binder, the curing temperature of 180 ~ 200 ℃.

    Rubber bonded abrasives roll machine mainly used for mixing, and rolled into thin slices, then use the knife punching molding; also some with loose material, press on the inner metal mold into shape. Curing in the curing tank after forming, the temperature is 165 ~ 180 ℃.

    Metal bond abrasive powder metallurgy manufacturing process and plating method are two kinds of abrasive products mainly used in super-hard abrasive. Powder metallurgy bronze as the binder, after mixing with hot or at room temperature compression molding, and sintering processing. Plating with nickel or nickel-cobalt alloy electroplating metal, electroplating process by Abrasive consolidation in the matrix, made of abrasive.

    Particular variety of grinding with sintered alumina abrasive and fiber abrasive and so on. Sintered alumina abrasive is alumina and the amount of chromium oxide mixture, molding, sintering is made at about 1800 ℃. The abrasive compact, has high strength, mainly used for processing clocks, instruments and other parts. Fiber abrasive or adhesive is used with abrasive filaments have (such as nylon) as raw material, its flexibility, and is mainly used for polishing metal materials and products.

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Haining Xinsheng Hardware Factory-(Our main products: drawer slides, drawer runner.