Grinding wheel material for woodworking tools
Woodworking tool grinding, in addition to manual sharpening with natural whetstone, artificial oil and file, mechanical grinding mainly uses a variety of different grinding wheels, reasonable selection of grinding wheels is one of the keys to ensure the quality of grinding.
To make reasonable selection of grinding wheel, we must first understand its performance. The performance indicators of general grinding wheels include the type of abrasive, the thickness of abrasive (particle size), the type of bond, the hardness of grinding wheel, the organization of grinding wheel (void), the shape and size of grinding wheel, etc. In addition to the above indicators, diamond grinding wheels also have diamond concentration, diamond material layer thickness and material layer width.
1.General carbon tool steel and alloy tools tool grinding, the use of abrasive brown corundum (GZ), particle size of 46-100, ceramic bonding agent (A), hardness soft to medium (R-Z), medium organization (4-7) of different shapes and sizes of grinding wheels.
Brown corundum abrasive is made of bauxite, anthracite smelted in electric furnace, containing alumina more than 95%, good toughness, high hardness, high bending strength, cheap price. Ceramic binder is made of clay, feldspar and other natural silicates as raw materials, sintered at high temperatures, it has small elasticity, high grinding efficiency, water resistance, heat resistance, etc., can be dry ground, can also be wet ground with various coolant.
2.High speed steel tool grinding, in addition to the above brown corundum grinding wheel, white corundum grinding wheel (GB) or chrome corundum grinding wheel (GG) can also be selected.
White corundum is smelting industrial aluminum powder as the main raw material in the electric furnace, containing alumina more than 98.5%, white. White corundum is harder than brown corundum, more brittle, sharp edges, less grinding heat, high grinding wheel durability, grinding high-speed steel tool effect is better, the disadvantage is more expensive.
White corundum is good, processing finish is high, chrome jade is generally rose red or purple.
3.Carbide tool grinding, to choose green silicon carbide (TL) or artificial diamond (JR) grinding wheel.
Green silicon carbide is made of silica and petroleum coke as raw materials, containing more than 99% silicon carbide, this abrasive hardness is higher than corundum, brittle and sharp, grinding heat is less, is a cheaper grinding carbide abrasive.
Artificial diamond is made of graphite under the action of catalyst and ultra-high pressure, ultra-high temperature, its main component is carbon (C), colorless transparent, light yellow, yellow green, black and other colors, artificial diamond abrasive hardness is extremely high, is the best abrasive for grinding carbide tools, compared with green silicon carbide, grinding productivity is 5 times higher, high finish 1-3 levels, Tool durability 1-3 times higher. Diamond grinding wheel is expensive, poor toughness, especially strong affinity for iron group elements, poor thermal stability, in the air medium will be graphitized at 700-800 ° C, so it can not be used to grind steel tools.
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