In order to meet the service requirements and durability of parts, heat treatment (quenching + tempering) is often used to greatly improve the rigidity, hardness, wear resistance, fatigue strength and toughness of steel. After heat treatment, the hardness of some steel parts reaches above HRC60, which is difficult to process. Traditional cemented carbide tools are difficult to solve. Some enterprises have just come into contact with such hard quenched steel parts. They don’t know what tools are suitable for processing. Many cemented carbide tools can’t achieve the ideal effect.
What tungsten steel milling cutter is more suitable for quenched steel parts above HRC60?
Firstly, in the process of machining quenched steel parts above HRC60, the hardness of the tool itself must be higher than that of the quenched steel parts, and such workpieces are more high-precision parts, such as molds and ball screws, which have high requirements for surface quality. Therefore, at present, the tool materials for machining quenched steel parts above HRC60 are mainly cubic boron nitride (PCBN) tools. Cubic boron nitride (PCBN) cutting tools are divided into integral type and welding type, and the welding type is divided into through welding cubic boron nitride cutting tools and composite PCBN cutting tools.
How to select tool materials to process quenched steel parts?
Reasonable selection of tool materials is an important condition for finishing quenched steel. According to the cutting characteristics of quenched steel, tool materials should not only have high hardness, wear-resistance and heat resistance but also have a certain strength and thermal conductivity. The hardness of cemented carbide tools is 89-94hra, which is equivalent to 71-76hrc. When machining quenched steel above hrc40, cemented carbide blades are easy to burn and cause wear blocks, and the machining efficiency is low. Therefore, it is suitable for the finishing of workpieces with hardness below hrc45. Relatively speaking, it needs low-speed turning (if it is a single piece of occasional finishing production, it can also be processed with ordinary cemented carbide tools of the appropriate brand).
Generally, it is selected according to the machining allowance and the rigidity of the processing system. In general, AP = 0.1 ~ 3M. At present, the bn-s10 developed for cutting quenched steel with a large amount of surplus has a cutting depth of 7-10mm. For the deformed workpiece after quenching, the machining allowance of quenched steel is difficult to control and needs annealing and re processing, satisfactory tool selection is given, which changes the inherent machining process of quenched steel; The feed rate is generally 0.05 ~ 0.4 mm / R. In case of high hardness of workpiece material or intermittent cutting, in order to reduce the unit cutting force, the feed rate should be reduced to prevent edge collapse and tool beating; For the selection of machining feed, KHC tungsten steel milling cutter suggests to select the tool angle according to the shape and size of the workpiece, which can improve the machining efficiency and effectively improve the service life of the tool.
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