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一、前言随着科学技术的发展,各种难加工材料不断涌现,特别是在航天、电力和冶金行业中更甚。这类材料有硬度高(如高铬白口铸铁的硬度为HV 1500～1800)、强度高(如超高强钢40CrMnSiMoVA的强度σ_b=1900N/mm~2)、粘性大(如镍基合金)、导热性差(如耐热合金)、加工硬化大(如高锰钢)等特点。相应地要求刀具应具有极好的红硬性、良好的热强性和导热性。一般刀具材料难以满足上述要求,有时甚至无法加工。为了满足用户对切削难加
I. Introduction With the development of science and technology, various kinds of refractory materials are constantly emerging, especially in aerospace, power and metallurgical industries. Such materials have high hardness (such as high-hardness white cast iron HV 1500 ~ 1800), high strength (such as the strength of ultra-high-strength steel 40CrMnSiMoVA σ_b = 1900N / mm ~ 2), viscous (such as nickel- Poor thermal conductivity (such as heat-resistant alloy), work-hardening (such as high manganese steel) and so on. Accordingly, the tool should be required to have excellent red hardness, good thermal strength and thermal conductivity. General tool material difficult to meet the above requirements, and sometimes can not even be processed. In order to meet the user’s cutting difficult