Commonly used cemented carbides are divided into three categories according to their composition and performance characteristics: tungsten-cobalt, tungsten-titanium-cobalt, tungsten-titanium-tantalum (niobium), and tungsten-cobalt and tungsten-titanium-cobalt cemented carbides are the most widely used in production.
(1) Tungsten-cobalt cemented carbide
The main components are tungsten carbide (WC) and cobalt. The grades are represented by the code name YG ("hard" and "cobalt" in Pinyin prefix), followed by the percentage of cobalt content. For example, YG6 represents a tungsten-cobalt cemented carbide with a cobalt content of 6%, and a tungsten carbide content of 94%.
(2) Tungsten-titanium-cobalt cemented carbide
The main components are tungsten carbide (WC), titanium carbide (TiC) and cobalt. The grades are represented by the code name YT ("hard" and "titanium" in Chinese pinyin prefix), followed by the percentage of titanium carbide content. For example, YT15 represents a tungsten-titanium-cobalt cemented carbide with 15% titanium carbide content.
(3) Tungsten titanium tantalum (niobium) hard alloy
This type of cemented carbide is also called general cemented carbide or universal cemented carbide. The main components are tungsten carbide (WC), titanium carbide (TiC), tantalum carbide (TaC) or niobium carbide (NbC) and cobalt. The grades are represented by the code YW (the initials of the Chinese pinyin of "hard" and "wan") followed by an ordinal number.
Application of cemented carbide
(1) Tool material
Cemented carbide has the largest number of tool materials, which can be used to make turning tools, milling cutters, planers, drills, etc. Among them, tungsten-cobalt cemented carbide Cemented Carbide Inserts is suitable for the processing of ferrous metals and non-ferrous metals with short chips and the processing of non-metallic materials, such as cast iron, cast brass, bakelite, etc.; tungsten-titanium-cobalt cemented carbide is suitable for steel and other ferrous metals. Chip processing. Among similar alloys, those with more cobalt are suitable for rough machining, and those with less cobalt are suitable for finishing. The machining life of general-purpose cemented carbide for difficult-to-machine materials such as stainless steel is much longer than that of other cemented carbides.
(2) Mold material
Cemented carbide is mainly used as cold drawing die, cold punching die, cold extrusion die, cold forging die and other cold working dies.
The common feature of hard alloy cold heading dies is that they require good Surface Milling Inserts impact toughness, fracture toughness, fatigue strength, flexural strength and good wear resistance under the wear-resistant working conditions of impact or strong impact. Usually select medium and high cobalt and medium and coarse grain alloy grades, such as YG15C.
Generally speaking, the relationship between the wear resistance and toughness of cemented carbide is contradictory: the increase in wear resistance will lead to a decrease in toughness, and the increase in toughness will inevitably lead to a decrease in wear resistance. Therefore, when selecting alloy grades, it is necessary to meet the specific use requirements according to the processing object and processing working conditions.
If the selected grade is prone to early cracking and damage during use, a grade with higher toughness should be selected; if the selected grade is prone to early wear and damage during use, it should be selected with higher hardness and better wear resistance. . The following grades: YG6C, YG8C, YG15C, YG18C, YG20C From left to right, the hardness decreases, the wear resistance decreases, and the toughness increases; vice versa.
(3) Measuring tools and wear-resistant parts
Cemented carbide is used for wear-resistant parts such as wear-resistant surface inlays and parts of measuring tools, precision bearings of grinders, guide plates and guide rods of centerless grinders, and center of lathes.
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