Material Of Blade

The most commonly used blade materials in the mechanical knife industry are roughly divided into four types: cemented carbide (TC), high speed steel (HSS) and Cr12MoV (D2, also known as SKD11) and 9CrSi. Generally, the selection of commonly used blade materials has its own industry practice. For example, the large round knife is suitable for Cr12MoV, and the punching knife is suitable for 9CrSi. The small round knife is suitable for high-speed steel, etc. These corresponding suitable materials are the most cost-effective under good use effect.

Cemented carbide is also known as TC, because the main component of cemented carbide is tungsten carbide. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance. In particular, it has high hardness and wear resistance. The temperature is basically the same at 500 ℃ and still has high hardness at 1000 ℃.

Cemented carbide is a kind of alloy material, which is used to cut cast iron, non-ferrous metals, glass, stone and ordinary steel. It can also be used to cut difficult materials such as heat-resistant steel, stainless steel and tool steel. However, due to its high price, most manufacturers will give priority to high-speed steel on the premise of maintaining good cutting of blades.

HSS is the abbreviation of English high speed steels, and the corresponding Chinese name is high speed steel. High speed steel is a common material for manufacturing cutting tools and molds, also known as front steel, It means that during quenching [1], it can harden even when cooled in air and is very sharp. It is an alloy steel with complex components, which is formed by carbide elements such as tungsten, molybdenum, chromium, vanadium and cobalt. The total amount of alloy elements is about 10 ~ 25%. It can maintain high hardness and Rockwell hardness under the condition of high heat generated by high-speed cutting (about 500 ℃) (HRC) can be above 60, which is the main characteristic of high-speed steel - red hardness [2]. Therefore, it is very suitable for manufacturing cutting tools.

Note: quenching [1]: after the workpiece is heated and insulated, it is quickly cooled in water, oil or other inorganic salts, organic aqueous solutions and other quenching media. After quenching, the steel parts become hard and brittle at the same time.

Red hardness [2]: refers to the ability of a material to maintain its hardness after maintaining it at a certain temperature for a certain time. In order to ensure its red hardness, carbide forming elements such as W, Mo, Cr and V must be added to high-speed steel.

Cr12MoV (international standard name D2, also known as SKD11) SKD11 is a Japanese tool steel brand, Cr12MoV is an ordinary cold working die steel with good wear resistance, is an alloy tool steel, does not belong to high-speed tool steel, and is basically used for heat treatment of die materials, which can reach hrc58-60. It is suitable for manufacturing various cold dies and tool stamping dies with large cross-section, complex shape and poor working conditions Tools, trimming dies, pipe dies, steel deep drawing dies, circular saw blades, standard tools and measuring tools, thread rolling, etc. It is suitable for cold extrusion, tensile film, beer stainless steel, etc. it has good quenching performance and small quenching deformation. It is most suitable for die accuracy. It has good high temperature strength, toughness and high temperature fatigue performance. It can withstand sudden changes in temperature. It is suitable for working at high temperature for a long time. It has excellent cutting performance and polishing performance.

9CrSi also belongs to alloy tool steel. It is a common low alloy tool steel and can be used for low-speed cutting tools. It has high hardenability and hardenability, high tempering stability and surface quenching heat sensitivity. If 9CrSi material can be heat treated, its application value will be improved to a certain extent. This material is suitable for crushing more brittle products with low requirements.

Ordinary alloy tool steel generally works at the temperature of 180 ℃ - 250 ℃, while high-speed tool steel can still maintain high hardness at the working temperature of about 600 ℃. In this way, high-speed tool steel is almost an upgraded version of alloy tool steel, but alloy tool steel has enough wear resistance and good toughness after quenching, so I think different materials have their most suitable uses, and there is no absolute good or bad.