SURFACE COATING CUTTING TOOL

• Main Authors: ISHIGAKI TAKUYA, NAKAMURA DAIKI, YANAGISAWA MITSUAKI, HONMA HISASHI
• Format: Patent
• Language: English; Japanese
• Published: 16.09.2021
• Subjects: BORING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TURNING

To provide a coating tool having chipping resistance and wear resistance even in high-speed continuous cutting processing of alloy steel, cast iron or the like.SOLUTION: In a coating tool, a coating layer (Ti1-xAlx)(CyN1-y) of a base body surface has crystal grains having cubic crystal structures of 70 area% or larger, and an average composition is 0.60≤xavg≤0.95, 0.000≤yavg≤0.010. In each of the crystal grains, when setting a range which is surrounded by a curved line separated from a grain boundary by 25 nm into a grain as a region α, setting a range surrounded by the curved line and the grain boundary as a region β, setting average values of x, y in all the regions α as xαavg, yαavg, forming a measurement region which is divided at 50 nm intervals over entire regions of the adjacent regions β, and setting average values of x, y as xβavg, yβavg at the respective measurement regions, a total sum of areas satisfying 0.10≤xβavg≤xαavg-0.10, yαavg+0.010≤yβavg≤0.680 is 5.0 to 20.0 area% with respect to a total area of the region β.SELECTED DRAWING: Figure 1 【課題】合金鋼や鋳鉄等の高速断続切削加工でも耐チッピング性や耐摩耗性を備える被覆工具の提供【解決手段】基体表面の（Ｔｉ１−ｘＡｌｘ）（ＣｙＮ１−ｙ）の被覆層が７０面積％以上の立方晶構造の結晶粒を有し、平均組成が０．６０≦ｘａｖｇ≦０．９５、０．０００≦ｙａｖｇ≦０．０１０で、各結晶粒において、粒界から粒内に２５ｎｍ離間した曲線に囲まれた範囲を領域α、曲線と粒界に囲まれた範囲を領域βとし、すべての領域αのｘ、ｙの平均値を、ｘαａｖｇ、ｙαａｖｇとし、隣接する領域βの全領域にわたり５０ｎｍ間隔で分割した測定領域を設け、測定領域ごとにｘ、ｙの平均値をｘβａｖｇ、ｙβａｖｇとするとき、０．１０≦ｘβａｖｇ≦ｘαａｖｇ−０．１０、ｙαａｖｇ＋０．０１０≦ｙβａｖｇ≦０．６８０を満足するものの面積の総和が領域βの総面積に対して５．０〜２０．０面積％である被覆工具【選択図】図１