JP3622846B2 - Sticky milling tool - Google Patents

Description

【００５６】
【表２】

【００５７】
【表３】

【００５８】
上記各試料を用いて以下の条件でフライス加工を行い、カッターに取り付けた試料１個に溶着や凝着が生じるまでの被削量及び溶着や凝着が生じた際の摩耗量を測定した。表４に試験に被削材（焼入れ前のもの）及び試験条件を示す。被削量の評価は、被削材（３００ｍｍ×１００ｍｍ）を１枚スライスした切削量（切削長）を１パスとした。その結果を表５に示す。
【００５９】
【表４】

【００６０】
【表５】

【００６１】
表５に示すように、硬質被膜層のうち、チャンファーホーニング部の最外層が異なる実施例１−１〜１−３４は、７〜１０パスという優れた耐溶着性、耐凝着性を示すと共に、０．３０ｍｍ未満という優れた耐摩耗性を示す。特に、実施例１−１、１−２、１−７〜１−１５、１−１８〜１−２０、１−２４〜１−２６、１−３０〜１−３２は、切削長１０パス、摩耗量０．２０ｍｍ以下であり、極めて優れていた。また、これら実施例１−１、１−２、１−７〜１−１５、１−１８〜１−２０、１−２４〜１−２６、１−３０〜１−３２は、特に高精度の仕上げ面粗さを得ることができた。
【００６２】
なお、実施例１−１、１−２、１−７〜１−１５、１−１８〜１−２０、１−２４〜１−２６、１−３０〜１−３２において、すくい面側境界部を介して第一領域とすくい面側の平滑面と繋がる領域７ｂ（図１参照）、及び逃げ面側境界部を介して第二領域と逃げ面側の平滑面と繋がる領域８ｂ（同）の最外層がＡｌ_２Ｏ_３である場合、より耐溶着性、耐凝着性に優れることが確認できた。このとき、領域７ｂの範囲は、すくい面境界部からすくい面側の平滑面に向かって０．５ｍｍ以下、領域８ｂの範囲は、逃げ面境界部から逃げ面側の平滑面に向かって０．１ｍｍ以下であった。
【００６３】
第一又は第二領域のいずれかのみの最外層がＡｌ_２Ｏ_３である実施例１−３、１−４は、８パス目を切削し始めてすぐにすくい面側境界部付近又は逃げ面側境界部付近において溶着や凝着が生じていることが確認された。中央部が比較的大きく第一及び第二領域が比較的小さい実施例１−５は、最外層がＡｌ_２Ｏ_３である範囲が狭いことで、実施例の中で比較的溶着や凝着が生じ易かったが、摩耗は少なかった。中央部が比較的小さく第一及び第二領域が比較的大きい実施例１−６は、８パス目を切削し始めて半ばまで溶着や凝着が生じなかったが、摩耗は多いほうであった。これらのことからチャンファーホーニング部において中央部の幅ｃは、１／３ａ程度が適することが分かる。更に、中央部の幅ｃを変えて調べると幅ｃは、１／３ａ〜３／５ａが最適であることが確認できた。
【００６４】
最内層のＴｉＮの厚さを変えた実施例１−１７〜１−２１において、厚さ０．１μｍである実施例１−１７は、切削するに従って摩耗が進行することが確認された。また、厚さ３．５μｍである実施例１−２１は、実施例の中で摩耗が多いほうであった。これらのことから、最内層の厚さは、０．２〜３．０μｍが特に適することが分かる。更に、ＴｉＮが粒状組織でない実施例１−２２は、被膜層と基材との密着強度が比較的低く、実施例１−１８〜１−２０に比べて性能が劣った。このことから、最内層のＴｉＮは、粒状組織が好ましいことが分かる。
【００６５】
内層のＴｉＣＮの厚さを変えた実施例１−２３〜１−２７において、厚さ０．８μｍである実施例１−２３は、実施例の中で摩耗が多いほうであった。また、厚さが１８．５μｍである実施例１−２７は、膜強度が比較的低く摩耗が多くなった。これらのことから、内層のＴｉＣＮは、１．０〜１８．０μｍが特に適することが分かる。更に、ＴｉＣＮが柱状晶組織でない実施例１−２８は、膜の強度が比較的低く、実施例１−２４〜１−２６に比べて性能が劣った。このことから、内層のＴｉＣＮは、柱状晶組織が好ましいことが分かる。
【００６６】
中間層のＡｌ_２Ｏ_３の厚さを変えた実施例１−２９〜１−３３において、厚さ０．３、１５．５μｍである実施例１−２９、１−３３は、膜強度が比較的低く摩耗が多くなった。従って、中間層のＡｌ_２Ｏ_３は、０．５〜１５．０μｍが特に適することが分かる。更に、Ａｌ_２Ｏ_３がα型でない（κ型酸化アルミニウム）実施例１−３４は、α型酸化アルミニウムを被覆した実施例１−７などよりも膜強度が比較的低く、摩耗が多くなった。このことから、中間層の酸化アルミニウムは、α型が好ましいことが分かる。
【００６７】
内層をＴｉＣＮのみとした実施例１−１６は、最内側から順にＴｉＮ、ＴｉＣＮを被覆した実施例１−７などよりも密着強度が比較的低く、摩耗が多くみられた。このことから、内層は、最内側から順にＴｉＮ層、ＴｉＣＮ層を具えることが特に好ましいことが分かる。
【００６８】
一方、実施例と同様に基材に硬質被膜を被覆後、チャンファーホーニング部に研磨処理などを施していない比較例１−１は、チャンファーホーニング部の最外層がＴｉＣＮＯであるため、５パスで溶着が生じた。実施例と同様に基材に硬質被膜を被覆後、チャンファーホーニング部において最外層のＴｉＮを研磨処理して除去し、研磨後のチャンファーホーニング部全域の最外層をＡｌ_２Ｏ_３とした比較例１−２は、６パスまで溶着が生じなかったが、摩耗が多くみられた。硬質被膜層を基材から近い順にＴｉＮ、ＴｉＣＮ、Ａｌ_２Ｏ_３とし、チャンファーホーニング部を研磨処理して中央部の最外層をＡｌ_２Ｏ_３、第一及び第二領域の最外層をＴｉＣＮとした比較例１−３は、耐溶着性、耐摩耗性の双方とも非常に悪かった。これら比較例１−１〜１−３はいずれも高精度な仕上げ面粗さは得られなかった。
【００６９】
（試験例２）
上記試験例１で用いた実施例１−１、１−２、１−７、比較例１−１、１−３を用いて、被削材のロックウェル硬さ（Ｈ_ＲＣ＝２０、３５、４０、４５）を変えて、試験例１と同様にカッターに取り付けた試料１個に溶着や凝着が生じるまでの被削量及び溶着や凝着が生じた際の摩耗量を調べてみた。その結果、いずれの実施例１−１、１−２、１−７も、Ｈ_ＲＣ＝４０、４５の被削材では、切削が進むにつれて膜のチッピングが生じ、高精度な仕上げ面粗さを得ることができにくかった。一方、Ｈ_ＲＣ＝２０、３５の被削材では、いずれの実施例１−１、１−２、１−７も切削長９パス以上、摩耗量０．２０ｍｍ以下であり、良好な耐溶着性や耐凝着性、及び耐摩耗性を有することが確認できた。このことから、本願発明ミーリング工具は、ロックウェル硬さＨ_ＲＣ＝４０未満の比較的低硬度の材料をフライス加工する際に用いることが好ましいことが分かる。これに対し、比較例１−１は、いずれの被削材に対しても、切削長５パス、摩耗量０．５０ｍｍ以上であり、高精度な仕上げ面粗さが得られなかった。比較例１−３は、特にＨ_ＲＣ＝３５、２０の被削材において、耐溶着性や耐凝着性、耐摩耗性の双方とも非常に悪く、高精度な仕上げ面粗さが得られなかった。このことから、比較例１−３は、粘質材の加工に適していないことが分かる。
【００７０】
（試験例３）
（１）上記試験例１で用いた実施例１−７を用いて、硬質被膜層のうち、チャンファーホーニング部及び刃先稜線部のすくい面側境界部からすくい面にかけての領域において表面粗さを変えて摩耗量を調べてみた。試験は、試験例１と同様に行った。表面粗さは、ブラシによる研磨を施すことによって変化させた。なお、表面粗さ（Ｒｍａｘ）は、基準長さ５μｍにおける最大高さで表す。その結果を表６に示す。
【００７１】
【表６】

【００７２】
表６に示すように、硬質被膜のうち、チャンファーホーニング部の表面粗さが小さいほど摩耗が小さいことが分かる。特に、表面粗さ（Ｒｍａｘ）が０．２０μｍ以下であると、摩耗が０．３０ｍｍ未満となって、耐摩耗性に優れることが分かる。また、刃先稜線部のすくい面側境界部からすくい面にかけての領域は、範囲が大きいほど摩耗が小さいことが分かる。特に、表面粗さ（Ｒｍａｘ）が０．２０μｍ以下で、上記領域が２００μｍ以上であると、摩耗が０．２０ｍｍ以下となり、更に、同５００μｍ以上であると摩耗が０．１５ｍｍ以下となって、耐摩耗性に極めて優れることが分かる。併せて、チャンファーホーニング部の表面粗さを０．１０μｍとして、刃先稜線部のすくい面側境界部からすくい面にかけての領域における表面粗さ（Ｒｍａｘ）を変えて摩耗を調べてみた。すると、表面粗さ（Ｒｍａｘ）が０．２０μｍ以下であると、摩耗が０．４０ｍｍ未満であり、更に、上記領域の表面粗さ（Ｒｍａｘ）が０．２０μｍ以下の範囲が２００μｍ以上であると、摩耗が０．２０ｍｍ以下となって、特に優れていることが確認できた。このことから、チャンファーホーニング部と、刃先稜線部のすくい面側境界部からすくい面にかけて２００μｍ以上の範囲は、表面粗さ（Ｒｍａｘ）が０．２０μｍ以下であることが好ましいことが分かる。
【００７３】
（２）上記試験例１で用いた実施例１−７を用いて、硬質被膜層のうち、チャンファーホーニング部及び刃先稜線部の逃げ面側境界から逃げ面にかけての領域において、表面粗さを変えてマイクロチッピングの有無を調べてみた。試験は、試験例１と同様に行った。その結果を表７に示す。
【００７４】
【表７】

【００７５】
表７に示すように、硬質被膜層のうち、チャンファーホーニング部の表面粗さが小さいほどマイクロチッピングが少ないことが分かる。特に、表面粗さ（Ｒｍａｘ）が０．２０μｍ以下であると、マイクロチッピングがほとんどみられず、異常摩耗が生じにくいことが分かる。また、刃先稜線部の逃げ面側境界部から逃げ面にかけての領域は、範囲が大きいほどマイクロチッピングが少ないことが分かる。特に、表面粗さ（Ｒｍａｘ）が０．２０μｍ以下で上記領域が５０μｍ以上であると、マイクロチッピングは全くみられなかった。併せて、刃先稜線部の逃げ面側境界部から逃げ面にかけての領域における表面粗さを変えてマイクロチッピングの有無を調べてみた。すると、表面粗さ（Ｒｍａｘ）が０．２０μｍ以下であると、マイクロチッピングの発生がほとんどなく、更に上記領域の表面粗さ（Ｒｍａｘ）が０．２０μｍ以下である範囲が５０μｍ以上であると、マイクロチッピングがなく、特に優れていることが確認できた。このことから、チャンファーホーニング部と、刃先稜線部の逃げ面側境界部から逃げ面にかけて５０μｍ以上の範囲は、表面粗さ（Ｒｍａｘ）が０．２０μｍ以下であることが好ましいことが分かる。
【００７６】
（試験例４）
上記試験例１で用いた実施例１−７において、すくい面側の平滑面及び逃げ面側の平滑面に施される硬質被膜層の合計の厚さを変えて、溶着や凝着が生じるまでの被削量及び溶着や凝着が生じた際の摩耗を測定した。試験は、試験例１と同様に行った。その結果を表８に示す。
【００７７】
【表８】

【００７８】
表８に示すように、すくい面側の平滑面及び逃げ面側の平滑面に施される硬質被膜層の合計の厚さが２．０〜２０μｍである試料４−２〜４−４は、耐溶着性や耐凝着性、及び耐摩耗性の双方に優れることが分かる。これに対し、すくい面側の平滑面及び逃げ面側の平滑面に施される硬質被膜層の合計の厚さが２．０μｍ未満である試料４−１は、２．０μｍ以上の試料４−２〜４−４に比べて摩耗が多かった。また、すくい面側の平滑面及び逃げ面側の平滑面に施される硬質被膜層の合計の厚さが２０μｍを超える試料４−５は、２０μｍ以下の試料４−２〜４−４に比べて切削長が少なかった。なお、すくい面側の平滑面及び逃げ面側の平滑面の少なくとも一方に施される硬質被膜層の合計の厚さが２．０〜２０μｍであれば、耐溶着性及び耐摩耗性の双方に優れることが確認された。
【００７９】
（試験例５）
上記試験例１で用いた実施例１−７を用いて、チャンファーホーニング部の幅及びホーニング角度を変えて溶着や凝着が生じるまでの被削量を測定した。試験は、試験例１と同様に行った。なお、チャンファーホーニング部の幅とは、図２に示すすくい面側境界部から逃げ面側境界部間の幅Ｗである。ホーニング角度とは、図２に示すすくい面に対する角度θである。その結果を表９に示す。
【００８０】
【表９】

【００８１】
表９に示すように、幅Ｗが０．０５〜０．５ｍｍ、ホーニング角度が５〜４０°である試料５−４、５−６、５−８は、切削量が１０パスと耐溶着性、耐凝着性に優れていることが分かる。これに対し、幅Ｗが０．０５ｍｍ未満、０．５ｍｍ超、ホーニング角度が５°未満、４０°超のいずれかを満たす試料５−１〜５−３、５−５、５−７、５−９〜５−１１は、切削量が７〜８パスと試料５−４、５−６、５−８に比べて切削量が少なかった。このことから、チャンファーホーニング部の幅は０．０５〜０．５ｍｍ、ホーニング角度は５〜４５°が好ましいことが分かる。
【００８２】
上記試験例５において、更に、すくい面側又は逃げ面側の一方のエッジを円弧状とした複合ホーニングとすると、上記の結果より切削量が多く１２パスとなった。また、すくい面側及び逃げ面側の両方のエッジを円弧状とした複合ホーニングとすると、切削量が１４パスとなって、より耐溶着性、耐凝着性に優れることが確認できた。
【００８３】
【発明の効果】
以上、説明したように本発明粘質材用ミーリング工具によれば、硬質被膜層のうち、チャンファーホーニング部の最外層を部分的に異ならせることで、耐溶着性、耐凝着性、及び耐摩耗性との双方に優れるという特有の効果を奏す。特に本発明は、ロックウェル硬さＨ_ＲＣ＝４０未満の比較的低硬度の焼入れ前の金型鋼などをフライス加工する際において、長期に亘って優れた工具性能を呈することができる。また本発明は、溶着や凝着を防止すると共に摩耗の進行も防止することから、高精度の仕上げ面粗さを得ることも可能である。
【図面の簡単な説明】
【図１】本発明ミーリング工具において刃先稜線部付近における断面図である。
【図２】エッジホーニングにおいて、角度ホーニングを示す断面図である。
【図３】エッジホーニングにおいて、丸ホーニングを示す断面図である。
【図４】エッジホーニングにおいて、複合ホーニングを示す断面図である。
【符号の説明】
１ ミーリング工具 ２ 基材 ３ 硬質被膜層 ４ 刃先稜線部
５ すくい面側の平滑面 ６ 逃げ面側の平滑面
７ すくい面側境界部 ７ａ 第一領域 ７ｂ、８ｂ 領域 ８ 逃げ面側境界部
８ａ 第二領域
Ｗ チャンファーホーニング部の幅 θ ホーニング角度[0001]
BACKGROUND OF THE INVENTION
When milling a viscous material such as mold steel before quenching, the present invention is particularly suitable for a long tool life due to excellent welding resistance and wear resistance, and a high-precision machined surface roughness. It relates to milling tools for materials.
[0002]
[Prior art]
In milling tools for milling, by applying a hard coating layer by depositing titanium carbide, titanium nitride, titanium carbonitride, aluminum oxide, etc. on the surface of a base material made of WC-based cemented carbide or cermet, It has been attempted to improve wear and improve tool life.
[0003]
[Problems to be solved by the invention]
However, with conventional milling tools, in particular, Rockwell hardness H_RWhen a viscous material such as die steel or alloy steel before quenching having a relatively low hardness of less than C = 40 is milled, welding and adhesion are likely to occur on the tool surface during processing. Therefore, these welds and adherents are repeatedly attached to and detached from the tool surface during processing, compared to the case where milling of carbon steel etc. is progressed by wear and fracture due to peeling or breaking of the hard coating layer, There is a problem that the tool life is short.
[0004]
In recent years, dry processing without using cutting oil is increasing due to environmental problems. However, in dry machining, since the lubricating effect of cutting oil cannot be obtained, there is a problem that the work material is easily welded and adhered to the tool surface, the tool life is reduced, and the finished surface roughness is deteriorated. .
[0005]
Therefore, in Japanese Patent No. 2105396 (Japanese Patent Publication No. 7-73802), it is described that local damage is prevented by defining the surface roughness of the edge edge line portion and the hard coating layer in the vicinity thereof. . In Japanese Patent No. 2825693 (Japanese Patent Laid-Open No. 5-57507), the surface of the hard coating layer from the edge of the cutting edge to the rake face side and the flank face is mechanically polished to expose aluminum oxide on the cutting edge part. It is described that the welding resistance is improved by making it. Further, Japanese Patent No. 3006453 (JP-A-8-11005) discloses that the aluminum oxide film on the edge portion of the blade edge is removed partially or over the entire area to suppress peeling or chipping of the film due to welding. Is described.
[0006]
However, with these technologies, work materials that react easily with the components of the hard coating layer of the tool, such as mold steel and alloy steel before quenching, which are relatively low in hardness, are liable to cause welding and adhesion. When milling, it is not sufficient to suppress the reduction of tool life.
[0007]
In addition, since the surface roughness of the work material is deteriorated by the welded material or the adhered material, there is a problem that a desired finished surface roughness cannot be obtained in finishing processing that requires high processing accuracy.
[0008]
Therefore, the present invention provides a milling tool for sticky materials, which is less prone to welding and adhesion, and has a longer tool life by preventing the progress of wear, resulting in high-precision finished surface roughness. Objective.
[0009]
[Means for Solving the Problems]
The milling tool for sticky material of the present invention is a milling tool for sticky material having a hard coating layer on a base material, wherein the base material includes a binder phase containing one or more kinds of iron group metals, and a periodic table IVa. , Va, VIa group elements and Al, Si carbide, nitride, oxide and a hard phase containing one or more compounds selected from the group consisting of solid solutions thereof, It has a honing portion, and the outermost layer of the chamfer honing portion is partially different among the hard coating layers.
[0010]
The present invention is based on the following findings.
(1) In order to suppress the occurrence of welding and adhesion, it is necessary to reduce the cutting resistance during milling. In order to reduce this cutting resistance, it is effective to apply a chamfer honing portion to the edge portion of the cutting edge.
[0011]
(2) In a milling tool having a chamfer honing part, welding and adhesion are likely to occur at two locations in the chamfer honing part, near the rake face side boundary part and near the flank face side boundary part.
[0012]
(3) In order to easily identify the location (corner) used in the tool, a titanium compound layer or a zirconium compound layer is usually used as the outermost layer of the hard coating layer and is colored. However, these compounds tend to react with the components of the work material and cause welding or adhesion to the tool surface.
[0013]
(4) When the outermost layer of the hard coating layer includes a layer made of another component other than the titanium compound layer or the zirconium compound layer, the vicinity of the rake face side boundary and the flank face side boundary part where welding and adhesion are likely to occur Effective in suppressing welding and adhesion at two nearby locations. However, in the chamfer honing portion, wear resistance is reduced at locations other than the two locations near the rake face side boundary portion and the flank side boundary portion. On the other hand, the aluminum oxide layer is effective in preventing welding and adhesion.
[0014]
Therefore, the present invention is based on the findings of the above (1) to (4), out of the hard coating layer, the outermost layer in the region where welding or adhesion is likely to occur in the chamfer honing portion, and the region where wear is likely to proceed. This is a configuration different from the outermost layer. With this configuration, the present invention can increase the tool life by preventing the progress of wear in addition to preventing welding and adhesion, and can obtain a smoother finished surface roughness. In particular, the present invention can obtain long-term excellent tool performance and high-precision finished surface roughness in the milling of viscous materials such as mold steel and alloy steel before quenching with relatively low hardness. .
[0015]
The present invention will be described in detail below.
In the viscous material milling tool of the present invention, the chamfer honing portion of the hard coating layer includes a center portion, a first portion including a rake face side boundary portion located on both sides of the center portion, and a flank face side boundary portion. The outermost layer of at least one of the first region and the second region is an aluminum oxide layer, and the outermost layer at the center is TiC._xN_yO_{1- x -Y}Or ZrC_xN_yO_1-xyA (0 ≦ x, y, x + y ≦ 1) layer is preferred. That is, in the chamfer honing part of the hard coating layer, the outermost layer in the vicinity of the rake face side boundary part and the flank face side boundary part (first and second areas) where welding and adhesion easily occur is the aluminum oxide layer. The outermost layer in the region where the wear is likely to proceed (center portion) is a titanium compound layer or a zirconium compound layer. At this time, if a is the width of the chamfer honing portion of the hard coating layer, c is the width of the central portion, and b and d are the widths of the first and second regions, 0 ≦ b <1 / 2a, 0 ≦ It is assumed that d <1 / 2a and 0.2 ≦ c / a <1. b <1 / 2a, d <1 / 2a, 0.2 ≦ c / a, when b ≧ 1 / 2a, d ≧ 1 / 2a, and c / a <0.2, the outermost layer is titanium This is because the range of the compound layer or the zirconium compound layer is small and it is difficult to suppress the progress of wear.
[0016]
In addition, the region connected to the first surface and the smooth surface on the rake surface side through the rake face side boundary portion, and the region connected to the second region and the smooth surface on the flank surface side through the flank side boundary portion are also first As in the second region, the outermost layer is preferably an aluminum oxide layer. At this time, the range of the former region is 0.5 mm or less from the rake face boundary portion toward the rake surface side smooth surface, and the latter region is from the flank boundary portion toward the flank side smooth surface. 0.1 mm or less is preferable. Even if this range is exceeded, an increase in the effect on prevention of welding and adhesion is not observed.
[0017]
The aluminum oxide layer is preferably substantially composed of α-type aluminum oxide. α-type aluminum oxide has a high-temperature stable crystal structure and high strength and heat resistance. For this reason, the strength of the film itself can be increased, and it is effective for the outermost layer in the portion in direct contact with the work material. In addition, the strength of the tool can be improved by improving the strength of the film itself.
[0018]
The thickness of the α-type aluminum oxide layer is preferably 0.5 to 15 μm. If the thickness is less than 0.5 μm, the effect of the α-type aluminum oxide is not obtained, and it is difficult to improve the strength of the film. If the thickness exceeds 15 μm, the strength of the film decreases due to an increase in tensile stress in the film. It is.
[0019]
Such an α-type aluminum oxide layer can be formed by a known method.
[0020]
TiC_xN_yO_{1- x -Y}Or ZrC_xN_yO_1-xyIn the (0 ≦ x, y, x + y ≦ 1) layer, x and y can be changed by changing the conditions during film formation, such as physical vapor deposition (PVD) and chemical vapor deposition (CVD). It is good to carry out by the known method.
[0021]
Of the hard coating layer, at least one of the chamfer honing part and a range of at least 200 μm from the rake face side boundary part to the rake face of the cutting edge ridge line part and a range of at least 50 μm from the flank face boundary to the flank face of the cutting edge ridge line part. The surface roughness (Rmax) is preferably 0.20 μm or less (reference length is 5 μm).
[0022]
The reason why the surface roughness (Rmax) of the chamfer honing portion of the hard coating layer is set to 0.20 μm or less is that when it exceeds 0.20 μm, the surface irregularities are liable to be welded or adhered.
[0023]
Crater wear due to scraping of the chips may occur in the range of at least 200 μm from the rake face side boundary part to the rake face side of the cutting edge ridge line part. Therefore, in the present invention, by smoothing at least this range, the flow of chips is smoothed to suppress crater wear, and tool damage due to crater wear is improved. At this time, the range in which the surface roughness (Rmax) is 0.20 μm or less may be appropriately widened according to the work material and cutting conditions, but it is up to 500 μm from the rake face side boundary to the rake face of the cutting edge ridge line part. It is more desirable to set the range.
[0024]
In the range of at least 50 μm from the flank side boundary portion of the cutting edge ridge line portion to the flank surface, abnormal wear due to chip welding accompanying microchipping of the hard coating layer may proceed. In addition, irregularities on the surface of the hard coating layer, adhered deposits, and the like may be transferred to the work material to deteriorate the finished surface roughness of the work material. Therefore, in the present invention, at least this range is smoothed to suppress abnormal wear and improve the finished surface roughness. The range in which the surface roughness (Rmax) is 0.20 μm or less may be appropriately increased according to the work material and cutting conditions. However, the range is set to 200 μm from the flank side boundary portion to the flank surface of the cutting edge ridge line portion. It is more desirable.
[0025]
The reason why the surface roughness (Rmax) is set to a maximum height of 0.20 μm or less at a reference length of 5 μm is that the desired effect cannot be obtained if it is larger than 0.20 μm, and smaller if it is smaller than 0.20 μm. The more preferable.
[0026]
The surface roughness (Rmax) may be measured by, for example, observing from the cross section of the hard coating layer by a scanning electron micrograph.
[0027]
As a method for controlling the predetermined surface roughness, for example, polishing with a buff, a brush, a barrel, an elastic grindstone, or the like is preferable. In addition, surface modification by microblasting or ion beam irradiation can be applied.
[0028]
Of the hard coating layer, at least one of the rake face excluding the vicinity of the rake face side boundary part and the flank face excluding the vicinity of the flank face side boundary part is Ti (C_wB_xN_yO_z) (W + x + y + z = 1, w, x, y, z ≧ 0) at least one inner layer, and TiC_xN_yO_1-xyOr ZrC_xN_yO_1-xyIt is desirable to have an outer layer composed of at least one of (0 ≦ x, y, x + y ≦ 1) layers and an intermediate layer composed of an aluminum oxide layer. At this time, the total thickness is preferably 2 to 20 μm.
[0029]
The inner layer is Ti (C_wB_xN_yO_z) High wear resistance can be obtained by forming from at least one layer of (w + x + y + z = 1, w, x, y, z ≧ 0). In addition, by making the intermediate layer an aluminum oxide layer, Ti (C_wB_xN_yO_z) Layer can be protected from welding and adhesion.
[0030]
Here, when aluminum oxide is entirely disposed on the outermost layer of the hard coating layer, there is a problem that it is difficult to identify a used portion (corner) at a cutting work site. In order to solve such a problem, TiC is used as an identification layer on the aluminum oxide layer._xN_yO_1-xyOr ZrC_xN_yO_1-xyIt is preferable to color at least one of the (0 ≦ x ≦ 1, 0 ≦ y ≦ 1, 0 ≦ x + y ≦ 1) layers as an outer layer, particularly the outermost layer.
[0031]
The total thickness of the hard coating layer applied to at least one of the smooth surface on the rake face side and the smooth surface on the flank face side is preferably 2 to 20 μm. If the thickness is less than 2 μm, the wear resistance is insufficient, and if it exceeds 20 μm, the strength of the hard coating layer is reduced and chipping and chipping are likely to occur, and welding and adhesion are likely to occur with this chipping. It is.
[0032]
In the hard coating layer, at least one of the inner layers is preferably made of titanium carbonitride having a columnar crystal structure. At this time, the hard coating layer can achieve both chipping resistance and wear resistance. In particular, in cutting operations such as intermittent cutting and component processing, it is possible to obtain high wear properties while preventing the inner layer from being broken by the intermediate layer or the outer layer. For example, when an aluminum oxide layer is provided as an intermediate layer, damage from the aluminum oxide layer can be prevented.
[0033]
The thickness of the titanium carbonitride layer is desirably 1 to 18 μm. This is because if the thickness is less than 1 μm, the wear resistance decreases, and if it exceeds 18 μm, the strength of the film decreases.
[0034]
Of the hard coating layers, the innermost layer in contact with the substrate is preferably made of titanium nitride having a granular structure with high adhesion strength to the substrate. At this time, the performance of the tool can be further improved by improving the adhesion strength between the inner layer and the substrate.
[0035]
The thickness of the titanium nitride layer is preferably 0.2 to 3 μm. This is because if the thickness is less than 0.2 μm, the effect of improving the adhesion strength in the film is small, and if it exceeds 3 μm, the wear resistance decreases.
[0036]
A known physical vapor deposition method (PVD) or chemical vapor deposition method (CVD) may be used to form such a hard coating layer.
[0037]
The chamfer honing part has a width between the rake face side boundary part and the flank face side boundary part as seen from the rake face side of 0.05 to 0.5 mm, and the honing angle is 5 to 40 ° with respect to the rake face. It is desirable.
[0038]
If the width between the rake face side boundary part and the flank face side boundary part is less than 0.05 mm or the honing angle is less than 5 °, the strength of the cutting edge is insufficient in milling, and chipping and chipping are likely to occur. is there. This is because if the width is larger than 0.5 mm or the honing angle is larger than 40 °, the cutting resistance becomes too large, and an effect such as suppression of chipping cannot be obtained. Further, the chamfer honing portion may be a composite honing in which at least one edge on the rake face side and the flank face side has an arc shape. This is because by providing arc-shaped honing (round honing), chipping can be suppressed more than in the case of chamfer honing alone. Note that by controlling the chipping, it is possible to reduce welding and adhesion accompanying the chipping.
[0039]
The viscous tool milling tool of the present invention has a Rockwell hardness H_RIt is preferably used when milling a mold steel or alloy steel before quenching having a relatively low hardness of less than C = 40. Moreover, as a milling tool for sticky materials of this invention, the exchangeable blade part etc. which are provided in the front-end | tip part of the tool main body which can rotate are mentioned, for example.
[0040]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIG. 1 is a cross-sectional view of the milling tool of the present invention in the vicinity of the edge portion of the cutting edge. The tool 1 has a plurality of hard coating layers 3 formed on a substrate 2.
[0041]
The substrate 2 includes a cutting edge ridge line portion 4 that is a cutting edge portion, a rake face side smooth surface 5 that is connected in the horizontal direction across the cutting edge ridge line portion 4, and a relief surface side smooth surface 6 that is connected in the vertical direction. The blade edge ridge portion 4 includes a chamfer honing portion that has been subjected to edge honing in order to prevent chipping of the blade edge during cutting. In the tool of the present invention, the outermost layer of the chamfer honing portion of the hard coating layer 3 is partially different.
[0042]
The boundary portion between the cutting edge ridge portion 4 and the smooth surface 5 on the rake face side is the rake face side boundary portion 7 of the cutting edge ridge line portion 4, and the boundary portion between the cutting edge ridge line portion 4 and the smooth surface 6 on the flank side is This is the flank face side boundary portion 8 of the cutting edge ridge line portion 4. Further, in this example, the chamfer honing portion is a region from the rake face side boundary portion 7 to the flank face side boundary portion 8.
[0043]
Edge honing includes rake face side and flank face linearly connected at a fixed angle (see FIGS. 1 and 2) and arc-shaped round honing (see FIG. 3). It is good also as the composite honing (refer FIG. 4) which made the edge of this circle round honing. At this time, chipping at the boundary portions 7 and 8 can be further prevented.
[0044]
The hard coating layer 3 is formed by depositing a coating material on the substrate 2 by PVD or CVD. The coating layer 3 is optimally provided with a titanium compound layer 3A as an inner layer, an aluminum oxide layer 3B as an intermediate layer, and a titanium compound layer or a zirconium compound layer 3C as an outer layer.
[0045]
In the present invention, the outermost layer of the hard coating layer 3 in the chamfer honing portion is made different by polishing the tool 1 having the plurality of hard coating layers 3 on the base material 2 with an artificial brush or the like. Specifically, as shown in FIG. 1, in particular, the first region 7 a near the rake face side boundary portion 7 and the second region near the flank side boundary portion 8 that are likely to be welded or adhered in the chamfer honing portion. The titanium compound layer or zirconium compound layer 3C of 8a is removed to expose the aluminum oxide layer 3B applied as an intermediate layer, and this aluminum oxide layer 3B is used as the outermost layer. At this time, the first region 7a and the rake face side smooth surface 5 through the rake face side boundary portion 7 and the second region 8a and the flank side smooth surface through the flank side boundary portion 8 are connected. As for the area | region 8b connected with 6, it is preferable to make the outermost layer into the aluminum oxide layer 3B similarly to the 1st, 2nd area | regions 7a and 8a. Further, the central portion 4a of the chamfer honing portion where the wear easily proceeds does not remove the titanium compound layer or the zirconium compound layer 3C, but is used as it is as the titanium compound layer or the zirconium compound layer 3C.
[0046]
TiC_xN_yO_{1- x -Y}Titanium compounds such as ZrC_xN_yO_1-xyWhen the zirconium compound such as is the outermost layer, it generally reacts with the components of the work material and tends to cause welding. On the other hand, aluminum oxide is chemically stable and has low adhesion and adhesion to the work material. Therefore, in the present invention, the outermost layer in the vicinity of the rake face side boundary portion 7 and the flank face side boundary portion 8 where welding and adhesion are likely to occur is the aluminum oxide layer 3B. In the vicinity of the rake face boundary 7, the first area 7 a of the chamfer honing part and a part of the rake face side smooth face 5 (area 7 b) are included with the rake face boundary 7 interposed therebetween. The vicinity of the flank side boundary portion 8 includes the second region 8a of the chamfer honing portion and a part of the flank side smooth surface 6 (region 8b) with the flank side boundary portion 8 interposed therebetween.
[0047]
On the other hand, TiC_xN_yO_{1- x -Y}Titanium compounds such as ZrC_xN_yO_1-xyZirconium compounds such as these are resistant to rubbing wear and are therefore suitable as hard coating layers to be applied where wear tends to occur. Therefore, the central portion 4a of the chamfer honing portion that is likely to be worn in the present invention is not polished with a brush or the like, and the titanium compound layer or the zirconium compound layer 3C is the outermost layer.
[0048]
Compared with the conventional milling tool in which the outermost layer in the entire area of the chamfer honing part has the same component, the present milling tool 1 for sticky material having the above-described configuration is capable of performing welding and adhesion during processing such as milling. While preventing, it suppresses wear. Therefore, the tool life can be made longer than before. In addition, smooth finished surface roughness can be obtained by preventing welding and adhesion.
[0049]
(Test Example 1)
The material powder of the base material was blended, wet mixed by a ball mill for 10 hours and dried, and then pressed into a green compact having a specific shape. In this example, the cutting tip has a shape of model number SDKN42MT. Next, the green compact was inserted into a sintering furnace and vacuum sintered at a temperature of 1400 K for 1 hour. Thereafter, a honing process was performed on the blade edge portion. A plurality of hard coating layers were coated on this base material by a normal CVD method (predetermined temperature, gas, and pressure conditions as in the prior art). The cutting edge of the cutting tip, the rake face side boundary part and the flank side boundary part were polished and lapped with an artificial brush. Table 1 shows the base material and hard coating layer of each sample, Table 2 shows the relationship between a, b, c, and d of the chamfer honing part and the outermost layer in each sample, and Table 3 shows the form of the surface-cutting cutter produced in Table 3. .
[0050]
(Raw material powder)
weight%
A TaC: 3, NbN: 1, TiC: 2 Co: 6 WC: 88
B Co: 10 WC: 90
C TiCN: 2, TaNbC: 3 Co: 8 WC: 87
[0051]
(Changfer Honing width and angle)
Between the rake face boundary and the flank boundary (see FIG. 2): 0.20 mm
Honing angle θ (see Fig. 2): 25 ° relative to the rake face
[0052]
(Width of each area in Chamfer Honing Club)
Chamfer Honing Club: a
Central part: c
First and second regions: b and d respectively
Note that the width of each region is the width of the hard coating layer.
[0053]
(Surface roughness of hard coating layer (Rmax))
Chamfer Honing part: 0.1μm
500 μm range from the rake face side boundary to the rake face: 0.1 μm
200 μm range from flank side boundary to flank face: 0.1 μm
However, the surface roughness (Rmax) is the maximum height at a reference length of 5 μm.
[0054]
In Table 1, the hard coating layer indicates a laminated state before polishing / lapping treatment. In Table 1, unless otherwise specified, TiN has a granular structure, TiCN has a columnar crystal structure, Al₂O₃Is α-type aluminum oxide. The same applies to other test examples described later.
[0055]
[Table 1]

[0056]
[Table 2]

[0057]
[Table 3]

[0058]
Milling was performed using the above samples under the following conditions, and the amount of wear until welding or adhesion occurred on one sample attached to the cutter and the amount of wear when welding or adhesion occurred were measured. Table 4 shows the work material (before quenching) and test conditions in the test. For the evaluation of the amount of cutting, a cutting amount (cutting length) obtained by slicing one work material (300 mm × 100 mm) was taken as one pass. The results are shown in Table 5.
[0059]
[Table 4]

[0060]
[Table 5]

[0061]
As shown in Table 5, Examples 1-1 to 1-34 in which the outermost layer of the chamfer honing portion is different among the hard coating layers exhibit excellent welding resistance and adhesion resistance of 7 to 10 passes. In addition, excellent wear resistance of less than 0.30 mm is exhibited. In particular, Examples 1-1, 1-2, 1-7 to 1-15, 1-18 to 1-20, 1-24 to 1-26, 1-30 to 1-32 have a cutting length of 10 passes, The amount of wear was 0.20 mm or less, which was extremely excellent. In addition, these Examples 1-1, 1-2, 1-7 to 1-15, 1-18 to 1-20, 1-24 to 1-26, 1-30 to 1-32 are particularly highly accurate. Finished surface roughness could be obtained.
[0062]
In Examples 1-1, 1-2, 1-7 to 1-15, 1-18 to 1-20, 1-24 to 1-26, 1-30 to 1-32, the rake face side boundary portion The region 7b (see FIG. 1) connected to the first region and the smooth surface on the rake face side through the first region, and the region 8b (the same) connected to the second region and the smooth surface on the flank side through the flank side boundary portion. Outermost layer is Al₂O₃In this case, it was confirmed that the welding resistance and adhesion resistance were more excellent. At this time, the range of the region 7b is 0.5 mm or less from the rake face boundary to the smooth surface on the rake face side, and the range of the region 8b is 0. 0 from the flank boundary to the smooth face on the flank side. It was 1 mm or less.
[0063]
The outermost layer only in either the first or second region is Al₂O₃In Examples 1-3 and 1-4, it was confirmed that welding or adhesion occurred in the vicinity of the rake face side boundary part or the flank face side boundary part immediately after starting the eighth pass. In Example 1-5 in which the central portion is relatively large and the first and second regions are relatively small, the outermost layer is made of Al.₂O₃The narrow range was relatively easy to weld and adherence in the examples, but there was little wear. In Example 1-6, in which the central portion was relatively small and the first and second regions were relatively large, welding and adhesion did not occur until halfway after the eighth pass started to be cut, but there was much wear. From these facts, it can be seen that the width c of the central portion in the chamfer honing portion is preferably about 1 / 3a. Further, when the width c of the central portion was changed and examined, it was confirmed that the width c was optimal from 1 / 3a to 3 / 5a.
[0064]
In Examples 1-17 to 1-21 in which the thickness of the innermost layer TiN was changed, it was confirmed that in Example 1-17 having a thickness of 0.1 μm, wear progressed as it was cut. In addition, Example 1-21 having a thickness of 3.5 μm had more wear in the examples. From these, it can be seen that the thickness of the innermost layer is particularly suitable from 0.2 to 3.0 μm. Furthermore, in Example 1-22 in which TiN was not a granular structure, the adhesion strength between the coating layer and the substrate was relatively low, and the performance was inferior to those of Examples 1-18 to 1-20. From this, it is understood that the innermost layer of TiN preferably has a granular structure.
[0065]
In Examples 1-23 to 1-27 in which the thickness of the inner layer of TiCN was changed, Example 1-23 having a thickness of 0.8 μm had more wear in the examples. Further, in Example 1-27 having a thickness of 18.5 μm, the film strength was relatively low and the wear was increased. From these facts, it is understood that 1.0 to 18.0 μm is particularly suitable for the TiCN of the inner layer. Further, Example 1-28 in which TiCN is not a columnar crystal structure has a relatively low film strength, and the performance is inferior to those of Examples 1-24 to 1-26. This indicates that the inner layer of TiCN preferably has a columnar crystal structure.
[0066]
Intermediate layer Al₂O₃In Examples 1-29 to 1-33 with different thicknesses, Examples 1-29 and 1-33 having thicknesses of 0.3 and 15.5 μm had relatively low film strength and increased wear. . Therefore, Al in the intermediate layer₂O₃It can be seen that 0.5-15.0 μm is particularly suitable. Furthermore, Al₂O₃In Example 1-34, which is not α-type (κ-type aluminum oxide), the film strength was relatively lower than that of Example 1-7 coated with α-type aluminum oxide, and the wear increased. From this, it is understood that the aluminum oxide of the intermediate layer is preferably α type.
[0067]
In Example 1-16 in which only the inner layer was TiCN, the adhesion strength was relatively lower than that in Example 1-7 coated with TiN and TiCN in order from the innermost side, and much wear was observed. From this, it can be seen that the inner layer is particularly preferably provided with a TiN layer and a TiCN layer in order from the innermost side.
[0068]
On the other hand, since the outermost layer of the chamfer honing part is TiCNO in Comparative Example 1-1 in which the chamfer honing part is not subjected to polishing treatment after the base material is coated with a hard film in the same manner as in the example, 5 passes Welding occurred. In the same manner as in the example, after coating the base material with a hard film, the outermost layer of TiN is removed by polishing treatment in the chamfer honing part, and the outermost layer in the entire chamfer honing part after polishing is made of Al₂O₃In Comparative Example 1-2, welding did not occur up to 6 passes, but much wear was observed. TiN, TiCN, Al in order of hard coating layer from base material₂O₃The chamfer honing part is polished and the outermost layer in the center part is made of Al.₂O₃In Comparative Example 1-3 in which the outermost layers of the first and second regions were TiCN, both the welding resistance and the wear resistance were very poor. In any of these Comparative Examples 1-1 to 1-3, high-precision finished surface roughness was not obtained.
[0069]
(Test Example 2)
Using Examples 1-1, 1-2, 1-7 and Comparative Examples 1-1, 1-3 used in Test Example 1, the Rockwell hardness (H_RC = 20, 35, 40, 45), the amount of work until welding or adhesion occurs on one sample attached to the cutter as in Test Example 1, and wear when adhesion or adhesion occurs I checked the amount. As a result, all of Examples 1-1, 1-2, and 1-7_RIn the work material with C = 40 and 45, the chipping of the film occurred as the cutting progressed, and it was difficult to obtain a highly accurate finished surface roughness. On the other hand, H_RFor the work materials with C = 20 and 35, all of Examples 1-1, 1-2, and 1-7 have a cutting length of 9 passes or more and a wear amount of 0.20 mm or less, and have good welding resistance and anti-coagulation property. It was confirmed that it had wearability and wear resistance. From this, the milling tool of the present invention has a Rockwell hardness H_RIt can be seen that it is preferable to use a relatively low hardness material of less than C = 40 when milling. On the other hand, Comparative Example 1-1 had a cutting length of 5 passes and a wear amount of 0.50 mm or more for any work material, and high-precision finished surface roughness was not obtained. Comparative Example 1-3 is particularly H_RIn the work material with C = 35 and 20, the welding resistance, adhesion resistance, and wear resistance were all very poor, and high-precision finished surface roughness was not obtained. From this, it can be seen that Comparative Example 1-3 is not suitable for processing a viscous material.
[0070]
(Test Example 3)
(1) Using Example 1-7 used in Test Example 1 above, in the hard coating layer, the surface roughness in the region from the rake face side boundary part to the rake face of the chamfer honing part and the cutting edge ridge line part. I changed it and examined the amount of wear. The test was performed in the same manner as in Test Example 1. The surface roughness was changed by polishing with a brush. The surface roughness (Rmax) is represented by the maximum height at a reference length of 5 μm. The results are shown in Table 6.
[0071]
[Table 6]

[0072]
As shown in Table 6, it can be seen that, among the hard coatings, the smaller the surface roughness of the chamfer honing portion, the smaller the wear. In particular, it can be seen that when the surface roughness (Rmax) is 0.20 μm or less, the wear is less than 0.30 mm and the wear resistance is excellent. Moreover, it turns out that wear is so small that the area | region from the rake face side boundary part of a cutting edge ridgeline part to a rake face is large. In particular, when the surface roughness (Rmax) is 0.20 μm or less and the region is 200 μm or more, the wear is 0.20 mm or less, and when the surface roughness is 500 μm or more, the wear is 0.15 mm or less. It can be seen that the wear resistance is extremely excellent. At the same time, the surface roughness of the chamfer honing portion was set to 0.10 μm, and the wear was examined by changing the surface roughness (Rmax) in the region from the rake face side boundary portion to the rake face portion of the cutting edge ridge line portion. Then, when the surface roughness (Rmax) is 0.20 μm or less, the wear is less than 0.40 mm, and the range of the surface roughness (Rmax) of the above region is 0.20 μm or less is 200 μm or more. The wear was 0.20 mm or less, and it was confirmed that it was particularly excellent. From this, it can be seen that the surface roughness (Rmax) is preferably 0.20 μm or less in the range of 200 μm or more from the chamfer honing part and the rake face side boundary part of the cutting edge ridge line part to the rake face.
[0073]
(2) Using Example 1-7 used in Test Example 1 above, in the hard coating layer, in the region from the flank side boundary to the flank surface of the chamfer honing part and the edge ridge line part, the surface roughness was determined. I changed it and examined the presence of microchipping. The test was performed in the same manner as in Test Example 1. The results are shown in Table 7.
[0074]
[Table 7]

[0075]
As shown in Table 7, it can be seen that among the hard coating layers, the smaller the surface roughness of the chamfer honing portion, the smaller the microchipping. In particular, it can be seen that when the surface roughness (Rmax) is 0.20 μm or less, microchipping is hardly observed and abnormal wear hardly occurs. Further, it can be seen that the region from the flank side boundary portion to the flank surface of the cutting edge ridge line portion has less microchipping as the range is larger. In particular, when the surface roughness (Rmax) was 0.20 μm or less and the region was 50 μm or more, no microchipping was observed. In addition, the presence or absence of microchipping was examined by changing the surface roughness in the region from the flank side boundary portion to the flank surface of the cutting edge ridge line portion. Then, when the surface roughness (Rmax) is 0.20 μm or less, there is almost no occurrence of microchipping, and the range where the surface roughness (Rmax) of the region is 0.20 μm or less is 50 μm or more. It was confirmed that there was no microchipping and it was particularly excellent. From this, it can be seen that the surface roughness (Rmax) is preferably 0.20 μm or less in the range of 50 μm or more from the chamfer honing part and the flank side boundary part of the cutting edge ridge line part to the flank face.
[0076]
(Test Example 4)
In Example 1-7 used in Test Example 1 above, changing the total thickness of the hard coating layer applied to the smooth surface on the rake face side and the smooth surface on the flank face side, until welding or adhesion occurs The amount of wear and the wear when welding or adhesion occurred were measured. The test was performed in the same manner as in Test Example 1. The results are shown in Table 8.
[0077]
[Table 8]

[0078]
As shown in Table 8, samples 4-2 to 4-4, in which the total thickness of the hard coating layer applied to the smooth surface on the rake side and the smooth surface on the flank side is 2.0 to 20 μm, It turns out that it is excellent in both welding resistance, adhesion resistance, and abrasion resistance. On the other hand, Sample 4-1 in which the total thickness of the hard coating layer applied to the smooth surface on the rake face side and the smooth surface on the flank face side is less than 2.0 μm is Sample 4- whose thickness is 2.0 μm or more. There was much abrasion compared with 2-4-4. In addition, Sample 4-5 in which the total thickness of the hard coating layer applied to the smooth surface on the rake face side and the smooth surface on the flank face side exceeds 20 μm is compared with Samples 4-2 to 4-4 of 20 μm or less. The cutting length was short. In addition, if the total thickness of the hard coating layer applied to at least one of the smooth surface on the rake face side and the smooth surface on the flank face side is 2.0 to 20 μm, both welding resistance and wear resistance are achieved. It was confirmed to be excellent.
[0079]
(Test Example 5)
Using Example 1-7 used in Test Example 1 above, the amount of cutting until welding or adhesion occurred by changing the width and honing angle of the chamfer honing portion was measured. The test was performed in the same manner as in Test Example 1. In addition, the width | variety of a chamfer honing part is the width W between the rake face side boundary part shown in FIG. The honing angle is an angle θ with respect to the rake face shown in FIG. The results are shown in Table 9.
[0080]
[Table 9]

[0081]
As shown in Table 9, Samples 5-4, 5-6, and 5-8 having a width W of 0.05 to 0.5 mm and a honing angle of 5 to 40 ° have a cutting amount of 10 passes and are resistant to welding. It can be seen that it has excellent adhesion resistance. On the other hand, samples 5-1 to 5-3, 5-5, 5-7, 5 satisfying any of the width W of less than 0.05 mm, more than 0.5 mm, and the honing angle of less than 5 ° or more than 40 °. In -9 to 5-11, the cutting amount was 7 to 8 passes, and the cutting amount was smaller than those of Samples 5-4, 5-6, and 5-8. From this, it can be seen that the chamfer honing portion preferably has a width of 0.05 to 0.5 mm and a honing angle of 5 to 45 °.
[0082]
In Test Example 5 described above, when the composite honing in which one edge on the rake face side or the flank face side was formed in an arc shape, the cutting amount was larger than the above result and 12 passes were obtained. Further, when composite honing in which both edges of the rake face side and the flank face are formed in an arc shape, the cutting amount was 14 passes, and it was confirmed that the welding resistance and adhesion resistance were more excellent.
[0083]
【The invention's effect】
As described above, according to the milling tool for sticky material of the present invention, the outermost layer of the chamfer honing portion of the hard coating layer is partially made different so that the welding resistance, the adhesion resistance, and It has a unique effect of being excellent in both wear resistance. In particular, the present invention has a Rockwell hardness H_RWhen milling a die steel before quenching having a relatively low hardness of less than C = 40 and the like, excellent tool performance can be exhibited over a long period of time. In addition, since the present invention prevents welding and adhesion and also prevents the progress of wear, it is possible to obtain a highly accurate finished surface roughness.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the vicinity of a cutting edge ridge line portion in a milling tool of the present invention.
FIG. 2 is a cross-sectional view showing angle honing in edge honing.
FIG. 3 is a cross-sectional view showing round honing in edge honing.
FIG. 4 is a cross-sectional view showing composite honing in edge honing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Milling tool 2 Base material 3 Hard coating layer 4 Edge part of cutting edge
5 Smooth surface on the rake face side 6 Smooth surface on the flank face side
7 Rake face side boundary part 7a First area 7b, 8b area 8 Flank face side boundary part
8a Second area
W Chamfer honing part width θ Honing angle

Claims (8)

In the milling tool for sticky material comprising a hard coating layer consisting of an inner layer, an intermediate layer, and an outer layer on a substrate,
The base material is selected from the group consisting of a binder phase containing one or more types of iron group metals, elements of Group IVa, Va, VIa and Al, Si carbides, nitrides, oxides and their solid solutions. Consisting of a hard phase containing one or more compounds
The blade edge line part has a chamfer honing part,
Among the hard coating layers, the chamfer honing portion includes a central portion, a first region including a rake face side boundary portion located on both sides of the central portion, and a second region including a flank side boundary portion. ,
Of the hard coating layer, the outermost layer of the chamfer honing part is partially different,
The outermost layer in the central portion is a TiC _x N _y O _{1- x -y} or ZrC _x N _y O _1-xy (0 ≦ x , y , x + y ≦ 1) layer forming the outer layer,
At least one outermost layer of the first region and the second region is an aluminum oxide layer that forms an intermediate layer ,
A milling tool for sticky materials characterized by satisfying 0 ≦ b < 1 / 2a , 0 ≦ d < 1 / 2a , and 0.2 ≦ c / a < 1 .
Where a is the width of the hard coat layer at the chamfer honing part, c is the width of the central part, and b and d are the widths of the first and second regions, respectively. 2. The milling tool for sticky material according to claim 1 , wherein the aluminum oxide layer is substantially composed of α-type aluminum oxide and has a thickness of 0.5 to 15 μm. Among the hard coating layers, at least a range of at least 200 μm from the chamfer honing part and the rake face side boundary part to the rake face of the cutting edge ridge part and a range of at least 50 μm or more from the flank side boundary to the flank face of the cutting edge ridge line part. 3. The viscous material milling tool according to claim 1 or 2 , wherein one surface has a surface roughness (Rmax) of 0.20 μm or less (reference length is 5 μm). Of the hard coating layer, at least one of the smooth surface on the rake face side and the smooth surface on the flank face side is Ti (C _w B _x N _y O _z ) (w + x + y + z = 1, w, x, at least one layer of at least one layer of y, z ≧ 0) and TiC _x N _y O _1-xy or ZrC _x N _y O _1-xy (0 ≦ x, y, x + y ≦ 1) layers The milling tool for sticky material according to any one of claims 1 to 3 , wherein the milling tool has a total thickness of 2 to 20 µm. The viscous material according to any one of claims 1 to 4 , wherein at least one of the hard coating layers is made of titanium carbonitride having a columnar crystal structure and has a thickness of 1 to 18 µm. Milling tools. The hard coating layer, wherein the innermost layer in contact with the substrate is made of titanium nitride having a granular structure, and has a thickness of 0.2 to 3 μm, for a sticky material according to any one of claims 1 to 5 Milling tool. Chamfer honing section, the width between the flank side boundary portion from the rake face side boundary portion is 0.05 to 0.5 mm, according to claim 1, characterized in that the honing angle is 5 to 40 ° with respect to the rake face milling tool for mucilaginous material according to any one of 1 to 6. 8. The viscous material milling tool according to claim 7 , wherein the chamfer honing portion is a composite honing in which at least one of the rake face side and the flank face side has an arc shape.

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