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SURFACE-COATED CUTTING TOOL EXHIBITING CHIPPING RESISTANCE OVER A LONG PERIOD IN CUTTING WORK OF HIGH-HARDNESS STEEL
PROBLEM TO BE SOLVED: To provide a coated cBN-based sintered tool that exhibits an excellent chipping resistance in the cutting work of a high-hardness steel.SOLUTION: The coated cBN-based sintered tool is provided in which: (a) the content ratio of cBN particles occupied in the whole sintered compact is 40-70 volume %, (b) cBN particles is a mixture of those with a particle diameter of under 2μ m and those with particle diameter of 2-4 μm at a volume ratio of 1:9 -5:5, (c) a residual stress of TiN phase in the binder of the cBN base exceeds -2.0 GPa and is 0 GPa or less with an overall residual stress of a rigid coating layer in a range of -4.5--0.5 GPa, (d) the rigid coating layer has the whole layer thickness of 1.3-4.0 μ m and is comprised of a first layer made of TiAlN and a second layer made of TiAlSiN with a thickness ratio of the first layer to the second layer being 1:3-1:5.
【課題】高硬度鋼の切削加工において、すぐれた耐チッピング性を発揮する被覆ｃＢＮ基焼結工具を提供する。【解決手段】 被覆ｃＢＮ基焼結工具において、（ａ）焼結体全体に占めるｃＢＮ粒子の含有割合は４０〜７０容量％であり、（ｂ）ｃＢＮ粒子は、粒径が２μｍ未満のものと２〜４μｍのものとが混在し、その容量比が、１：９〜５：５であり、（ｃ）ｃＢＮ基体のバインダー中のＴｉＮ相の残留応力が−２．０ＧＰａを超え０ＧＰａ以下の範囲内、かつ、硬質被覆層の総括的な残留応力が−４．５〜−０．５ＧＰａの範囲内であり、（ｄ）硬質被覆層は、全層厚が１．３〜４．０μｍであり、ＴｉＡｌＮからなる第一層とＴｉＡｌＳｉＮからなる第二層で構成され、第一層と第二層の厚さとの比は、１：３〜１：５である被覆ｃＢＮ基焼結工具。【選択図】図１
SURFACE-COATED CUTTING TOOL EXHIBITING CHIPPING RESISTANCE OVER A LONG PERIOD IN CUTTING WORK OF HIGH-HARDNESS STEEL
PROBLEM TO BE SOLVED: To provide a coated cBN-based sintered tool that exhibits an excellent chipping resistance in the cutting work of a high-hardness steel.SOLUTION: The coated cBN-based sintered tool is provided in which: (a) the content ratio of cBN particles occupied in the whole sintered compact is 40-70 volume %, (b) cBN particles is a mixture of those with a particle diameter of under 2μ m and those with particle diameter of 2-4 μm at a volume ratio of 1:9 -5:5, (c) a residual stress of TiN phase in the binder of the cBN base exceeds -2.0 GPa and is 0 GPa or less with an overall residual stress of a rigid coating layer in a range of -4.5--0.5 GPa, (d) the rigid coating layer has the whole layer thickness of 1.3-4.0 μ m and is comprised of a first layer made of TiAlN and a second layer made of TiAlSiN with a thickness ratio of the first layer to the second layer being 1:3-1:5.
【課題】高硬度鋼の切削加工において、すぐれた耐チッピング性を発揮する被覆ｃＢＮ基焼結工具を提供する。【解決手段】 被覆ｃＢＮ基焼結工具において、（ａ）焼結体全体に占めるｃＢＮ粒子の含有割合は４０〜７０容量％であり、（ｂ）ｃＢＮ粒子は、粒径が２μｍ未満のものと２〜４μｍのものとが混在し、その容量比が、１：９〜５：５であり、（ｃ）ｃＢＮ基体のバインダー中のＴｉＮ相の残留応力が−２．０ＧＰａを超え０ＧＰａ以下の範囲内、かつ、硬質被覆層の総括的な残留応力が−４．５〜−０．５ＧＰａの範囲内であり、（ｄ）硬質被覆層は、全層厚が１．３〜４．０μｍであり、ＴｉＡｌＮからなる第一層とＴｉＡｌＳｉＮからなる第二層で構成され、第一層と第二層の厚さとの比は、１：３〜１：５である被覆ｃＢＮ基焼結工具。【選択図】図１
SURFACE-COATED CUTTING TOOL EXHIBITING CHIPPING RESISTANCE OVER A LONG PERIOD IN CUTTING WORK OF HIGH-HARDNESS STEEL
高硬度鋼の切削加工ですぐれた耐チッピング性を長期に亘って発揮する表面被覆切削工具
SENBOKUYA KAZUAKI (author) / TAKAHASHI MASAKUNI (author) / SATO TAKASHI (author)
2015-08-03
Patent
Electronic Resource
Japanese
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