Characteristics and application of hard alloy for precision parts processing
Hard alloy is a tool material made by Powder Metallurgy Process. It combines some refractory tungsten carbide (WC), Carbonized titanium (TiC)Compound powder and binder metal cobalt (Co)
Phase mixing, pressure forming and sintering. It is characterized by high hardness (69 ~ 81HRC)And hot hard (Up to 900 ~ 1000 ° C)
Good wear resistance and high compressive strength, it can process materials that cannot be processed by high speed steel tools, can multiply the cutting speed of precision parts processing and prolong the service life of tools.
Due to the high hardness and brittleness of hard alloy, blades of certain specifications are generally made and welded on the cutter body.
The hard alloys commonly used in hard alloy tool bars and cutting tools are tungsten cobalt and tungsten titanium cobalt: 1.
Tungsten-cobalt cemented carbide: the brand of tungsten-cobalt cemented carbide is expressed by the percentage of 'YG' plus cobalt at the beginning of the Chinese pinyin of 'hard' and 'Cobalt', for example, YG6 means w (Co)
= 6% hard alloy, the rest is WC.
The higher the cobalt content, the higher the strength of the hard alloy, the better the toughness, and the lower the strength, the worse the wear resistance.
Cemented carbide tools with high cobalt content are used for rough machining with large impact vibration, while cemented carbide tools with low cobalt content are suitable for precision parts machining. 2.
Tungsten-titanium-cobalt hard alloy: the brand of tungsten-titanium-cobalt hard alloy is expressed by the percentage of 'hard' and 'Titanium' Chinese pinyin prefix 'YT' plus TiC. For example, YT14 means w (TiC)
= 14% hard alloy, other main chemical components are WC and Co.
The higher the content of TiC, the higher the hardness of hard alloy, the better the heat resistance, and the lower the strength, the worse the toughness.
Therefore, cemented carbide tools with more TiC are suitable for precision parts with relatively stable working conditions, and cemented carbide tools with less TiC are suitable for rough machining.
Tungsten-cobalt hard alloy has good strength and toughness, and its sharpening is also good. Tools made of this kind of hard alloy are suitable for processing cast iron and non-ferrous metals;
Tungsten titanium cobalt hard alloy has good wear resistance and heat resistance. Tools made of this kind of hard alloy are suitable for processing steel.
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