When selecting the angle of the tool, it is necessary to consider the influence of various factors, such as workpiece material, tool material, and processing properties. Generally speaking, the tool angle refers to the angle of labeling for manufacturing and measurement. In actual work, the actual working angle and the angle of the marking are different due to the different mounting positions of the tool and the change of the cutting motion direction, but usually the difference is small. .
The material used to make the tool must have high high temperature hardness and wear resistance, necessary bending strength, impact toughness and chemical inertness, good processability.
Generally, when the hardness of the material is high, the wear resistance is also high; when the bending strength is high, the impact toughness is also high. However, the higher the hardness of the material, the lower the bending strength and impact toughness. High-speed steel is still the most widely used tool material due to its high flexural strength and impact toughness, as well as good processability, followed by hard alloys.
Polycrystalline cubic boron nitride is suitable for cutting high hardness hardened steel and hard cast iron; polycrystalline diamond is suitable for cutting iron-free metals, and alloys, plastics and glass steel; carbon tool steel and alloy tool steel are now only used Tools such as trowels, dies and taps.
Carbide indexable inserts have now been coated with titanium carbide, titanium nitride, alumina hard or composite hard layers by chemical vapor deposition. The growing physical vapor deposition method can be used not only for cemented carbide tools, but also for high speed steel tools such as drills, hobs, taps and milling cutters. As a barrier to chemical diffusion and heat conduction, the hard coating slows the wear of the tool during cutting, and the life of the coated blade is about 1 to 3 times higher than that of the uncoated one.
Due to the high temperature, high pressure, high speed, and parts working in corrosive fluid media, more and more difficult materials are applied, and the automation level of cutting and the processing precision are getting higher and higher. In order to adapt to this situation, the development direction of the tool will be to develop and apply new tool materials; further develop the vapor deposition coating technology of the tool, and deposit a higher hardness coating on the high toughness and high strength substrate to better solve The contradiction between the hardness and strength of the tool material; further develop the structure of the indexable tool; improve the manufacturing precision of the tool, reduce the difference in product quality, and optimize the use of the tool.
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Label: Tool material Impact toughness Difficult to process materials Physical vapor deposition Metal processing
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