What is the advantage of coating for cutting tools?
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What is the advantage of coating for cutting tools?
For the coating of milling tools, its mainly advantages are below.
① Good mechanical and cutting performance: The coated metal cutting tools combines the excellent performance of the base material and the coating material, which not only maintains the good toughness and high strength of the base, but also has the high hardness, high wear resistance and low resistance of the coating, coefficient of friction. Therefore, the cutting speed of the coated tool can be increased by more than 2 times than that of the uncoated tool, and a higher feed rate is allowed, and its life has also been improved.
② Strong versatility: The coated tools has wide versatility and the processing range is significantly expanded. One type of coated tool can replace several types of uncoated tools.
③ Thickness of coating: The tool life will increase with the increase of coating thickness, but when the coating thickness reaches saturation, the tool life will no longer increase significantly. When the coating is too thick, it is easy to cause peeling; when the coating is too thin, the wear resistance is poor.
④ Regrindability: poor regrindability of coated blades, complex coating equipment, high process requirements, and long coating time.
⑤ Coating materials: cutting tools with different coating materials have different cutting performance. For example, when cutting at low speed, TiC coating has an advantage; when cutting at high speed, TiN is more suitable.
Performance characteristics of coated end mill cutter.
① High hardness: Cemented carbide tools are made of carbides with high hardness and melting point (called hard phase) and metal binder (called bonding phase) through powder metallurgy, and their hardness reaches 89-93HRA , Much higher than high-speed steel, at 5400C, the hardness can still reach 82-87HRA, which is the same as the hardness of high-speed steel at room temperature (83-86HRA). The hardness value of cemented carbide varies with the nature, quantity, particle size and content of the metal bonding phase of the carbide, and generally decreases with the increase of the content of the bonding metal phase. When the content of the binder phase is the same, the hardness of the YT alloy is higher than that of the YG alloy, and the alloy with TaC (NbC) added has higher high temperature hardness.
② Flexural strength and toughness: The flexural strength of commonly used cemented carbide is in the range of 900～1500MPa. The higher the metal bonding phase content, the higher the bending strength. When the binder content is the same, the strength of the YG-based (WC-Co) alloy is higher than that of the YT-based (WC-TiC-Co) alloy, and as the TiC content increases, the strength decreases. Cemented carbide is a brittle material, and its impact toughness at room temperature is only 1/30 to 1/8 of that of high-speed steel.
Above are the answer for the advantage of coating, hope this article is useful to you. Any further discussion, please feel free to contact Our Melody!
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