In the choice of tool Angle, need to consider the influence of a variety of factors, such as workpiece material, tool material, processing properties (rough, finish), etc., must be reasonable according to the specific situation. Usually speaking of tool Angle, refers to the manufacturing and measurement of the marking Angle in the actual work, due to the installation of the tool position is different and cutting direction change, the actual work Angle and marking Angle is different, but usually the difference is very small.

Manufacturing tool materials must have high temperature hardness and wear resistance, the necessary bending strength, impact toughness and chemical inertia, good technology (cutting, forging and heat treatment, etc.), and not easy to deformation.

Usually when the material hardness is high, the wear resistance is also high; When the flexural strength is high, the impact toughness is also high. However, the higher the material hardness, the lower the flexural strength and impact toughness. Due to its high flexural strength and impact toughness, as well as good machinability, high speed steel is still the most widely used tool material, followed by cemented carbide.

Polycrystalline cubic boron nitride is suitable for cutting high hardness hardened steel and hard cast iron, etc. Polycrystalline diamond is suitable for cutting ferrous metals, alloys, plastics and FRP, etc. Carbon and alloy tool steels are now used only for tools such as files, dies and taps.

Carbide indexable inserts are now coated with hard layers of titanium carbide, titanium nitride, alumina, or composite hard layers by chemical vapor deposition. Physical vapor deposition is being developed not only for cemented carbide tools but also for HSS tools such as drill bits, hobs, taps and milling cutters. As a barrier to chemical diffusion and heat conduction, the hard coating slows down the wear rate of the cutting tool, and the life of the coated blade is about 1~3 times higher than that of the uncoated blade.

Due to the high temperature, high pressure, high speed, and corrosive fluid media in the work of the parts, the application of more and more difficult to process materials, cutting automation level and machining accuracy requirements are higher and higher. In order to adapt to this situation, the direction of tool development will be the development and application of new tool materials; Further development of the tool vapor deposition coating technology, deposition of higher hardness coating on high toughness and high strength matrix, better solve the conflict between tool material hardness and strength; Further develop the structure of indexable tool; Improve the manufacturing precision of the tool, reduce the difference of product quality, and make the use of the tool to achieve the best.