The development of tool materials enables hard car technology to be processed in various parts

Metal Processing Online Knowledge Lecture: Hard Car Technology

In general, turning is only roughing before quenching. Until the 1990s, the finishing after quenching was only possible with the grinding process, while turning only machining workpieces with hardness values ​​below 55 HRC. Hard car technology, referred to as hard turning (for car grinding). The so-called hard turning refers to the turning of tantalum hard steel as the final processing or finishing process to replace the currently widely used grinding technology. Hardened steel generally refers to a workpiece material having a martensite structure after quenching, high hardness, high strength, and almost no plasticity. When the hardness of the hardened steel is >55HRC, the strength sb is about 2100-2600N/mm2. Hardened steel (55-65HRC) is machined on a lathe or turning center using polycrystalline cubic boron nitride (PCBN) tools, ceramic tools or coated carbide tools. The machining accuracy is up to IT5. , surface roughness Ra ≤ 0.4 μm.

In the field of turning machining, turning of complex parts and difficult-to-machine materials has always been a problem in turning machining. With the development of high-hardness cutting materials and related machine tools, the application of cubic boron nitride tools, ceramic tools and new carbide tools in new lathes or turning centers is no longer a problem for turning hardened steels and superalloys. The processing quality can reach the level of fine grinding. In developed countries, hard-car technology has been widely used in various parts processing, and the application of most hard-car technology has successfully replaced grinding.

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