Why should milling cutters be coated?
By century tool
February 26th, 2024
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A milling cutter is a rotating tool with one or more teeth used for milling operations. During operation, each cutter tooth intermittently cuts off the remainder of the workpiece.Milling cutters are mainly used for processing planes, steps, grooves, forming surfaces and cutting workpieces on milling machines.The performance of cemented carbide continues to improve and its application range expands, becoming the main tool material for cutting processing, playing an important role in promoting the improvement of cutting efficiency.The coating acts as a chemical and thermal barrier, reducing diffusion and chemical reactions between the tool and workpiece, thereby reducing lunar groove wear.Coated tools have the characteristics of high surface hardness, good wear resistance, stable chemical properties, heat and oxidation resistance, small friction factor and low thermal conductivity.When cutting, it can increase the tool life by 3 to 5 times more than uncoated tools, increase the cutting speed by 20% to 70%, improve the machining accuracy by 0.5 to 1 level, and reduce tool consumption by 20% to 50%. Therefore, coated tools have become the hallmark of modern cutting tools.Coatings have become a key technology to improve tool performance. Tool coating technology plays a very important role in the development of modern cutting processing and tools, especially in recent years, significant progress has been made. Chemical coating (CVD) is still the main coating process for indexable inserts. New processes such as medium-temperature CVD and thick-film aluminum oxide transition layer have been developed to make the CVD coating more wear-resistant based on the improvement of the base material. Sexuality and resilience are improved;CVD diamond coatings have also made progress, improving coating surface finish and entering a practical stage. During this period, the progress of physical coating (PVD) has been particularly eye-catching. Significant progress has been made in furnace structure, process, automatic control, etc., and heat resistance suitable for high-speed cutting, dry cutting, and hard cutting has been developed. Better coatings, such as super TiAIN, TiAlCN general coatings and DLC, W/C anti-friction coatings with better comprehensive properties, and through innovations in coating structures, nanometer and multi-layer structures have been developed, which has greatly improved Improved coating hardness and toughness.New advances in PVD coating technology show us the great potential and unique advantages of coating technology for improving tool performance: new coatings can be continuously developed by controlling coating process parameters and adjusting target materials and reactive gases. , to meet the needs of processing diversity, is a fast and good technology to improve and improve tool performance, and has very broad application prospects. Innovation in tool structureIt has changed the stereotyped appearance and single function of traditional standard tools.
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