JP4169544B2

JP4169544B2 - Hard film coated tool with excellent lubricity

Info

Publication number: JP4169544B2
Application number: JP2002235340A
Authority: JP
Inventors: 剛史石川
Original assignee: Hitachi Tool Engineering Ltd
Current assignee: Moldino Tool Engineering Ltd
Priority date: 2002-08-13
Filing date: 2002-08-13
Publication date: 2008-10-22
Anticipated expiration: 2022-08-13
Also published as: JP2004074319A

Description

【０００１】
【発明が属する技術分野】
本発明は、金属材料等の乾式切削加工に使用される硬質皮膜被覆工具に関するものである。
【０００２】
【従来の技術】
近年、機械加工の分野においては、全世界的な環境対策の要求によって、切削油剤を用いるいわゆる湿式切削加工から、切削油剤を用いない乾式切削加工に移行している。この理由は、従来の湿式加工が切削油剤の悪臭や飛散による汚染、油煙の発生などによる作業環境の悪化や廃油の処理問題、大気の汚染によって環境保全を阻害する要因と見なされているからである。このような状況下にあって、最近の乾式切削加工における高能率、高精度化においては、切削工具表面に被覆する耐摩耗皮膜と被加工物との凝着及び溶着現象が切削性能に大きな影響を及ぼしていると言える。例えば、硬質皮膜の耐摩耗性を追求したＴｉＡｌＮ皮膜に代表される高硬度皮膜が実用化されているが、皮膜を高硬度化することにより潤滑特性が犠牲となってしまい、その結果、被加工物との凝着及び溶着現象等に起因した摩擦抵抗が増加している。
【０００３】
【発明が解決しようとする課題】
しかし、高硬度皮膜と複層化を適用することにより、耐摩耗性と潤滑特性の両特性を併せ持った被覆工具作製を達成するためには、異材種を複層化するために、被覆装置上の制約がある。また、皮膜を低硬度化したことにより潤滑特性を有するものであるが、その作用はあくまでも自己潤滑作用によるものであり、低硬度を有する潤滑層が摩耗した後は、その効果は期待できない。乾式切削加工のような切削環境下においては満足される切削寿命は得られてはいない。更に、硬質皮膜表面に被加工物が凝着することにより発生する切削加工面のむしれが加工面品位及び加工精度を劣化させる等の課題がある。
又、皮膜表面を研磨処理した場合には、皮膜表面が活性化された状態で大気と接触した状態で放置することになり、潤滑性などの性能を長期間維持できないといった課題がある。
【０００４】
本発明は上記の様な乾式切削加工での切削環境下において生じる耐摩耗性や潤滑特性の問題に対し、硬質皮膜に潤滑性を付与する手段として、被覆装置上の制約もなく、また硬質皮膜の硬度を低下させることなく、優れた潤滑特性を容易に付与することを可能にするものであり、切削工具の長寿命化及び被削材との凝着及び溶着現象等を抑制可能である潤滑性に優れた硬質皮膜被覆工具を提供することを目的とする。又、皮膜表面の更なる潤滑性付与のために行う皮膜表面の研磨処理後においても、皮膜表面が大気と接触することから保護することによって、性能を長期間維持することを目的とする。
【０００５】
【課題を解決するための手段】
本発明は、（ＴｉＡｌ）Ｎ、（ＴｉＳｉ）（ＮＯ）、（ＣｒＳｉ）（ＮＢＯ）、Ｃｒ（ＢＮ）、Ｔｉ（ＮＢ）、（ＴｉＳｉＡｌ）Ｎ、Ｔｉ（ＣＮ）、（ＣｒＳｉ）Ｎ、Ｃｒ（ＣＮ）の硬質皮膜を最表面に被覆し、該硬質皮膜表面の凸部を機械的方法により除去し、その皮膜表面に、硫黄系極圧添加剤を含有した潤滑防錆油剤を塗布したことを特徴とする潤滑性に優れた硬質皮膜被覆工具からなることを要旨とするものである。詳細には、潤滑防錆油剤は、鉱油及び合成油の少なくとも１種を基油とし、硫黄系極圧添加剤として硫化油脂、硫化エステル、硫化オレフィン、ポリサルファイド、ジベンジルジサルファイド、ドデシルジサルファイド、ジフェニルジサルファイド、飽和脂肪酸硫化物、ジアルキルジチオカルバミン酸エステル−金属化合物から選択される少なくとも１種以上を質量比で３〜５０％含有し、防錆添加剤として中性スルフォネート、カルボン酸、カルボン酸エステルから選択される少なくとも１種以上を質量比で０．５〜１７％含有する潤滑防錆油剤であることが好ましい。
【０００６】
また、本願発明は、該硬質皮膜被覆表面の凸部を除去することによって更なる潤滑特性を付与することができ、この性能を長期間維持する為に硬質皮膜表面に硫黄系極圧添加剤を含有した該潤滑防錆油剤が塗布して皮膜表面が大気と接触することから保護することが好ましい。
【０００７】
【発明の実施の形態】
本発明者は工具切刃に付着する凝着もしくは溶着現象は、硬質皮膜そのものの摩擦抵抗、被加工物との親和性もしくは被加工物が皮膜へ付着した際の付着物の解離性等が複雑に関与しており、これらが切削工具の寿命もしくは被加工物の加工精度を支配していると考えた。従って、これらの改善が凝着もしくは溶着等の発生する切削環境下においてきわめて重要となる。硬質皮膜表面に硫黄系極圧添加剤を含有した潤滑防錆油剤が塗布されていることにより、硬質皮膜の摩擦抵抗の低減、被加工物との親和性もしくは被加工物との解離性等高めることに極めて有効に作用することを突き止め、本発明を完成させた。
【０００８】
即ち、工具切刃に付着する凝着もしくは溶着現象を抑制させるためには、硬質皮膜の摩擦抵抗の低減、被加工物との親和性もしくは被加工物が皮膜へ付着した際、付着物の解離性等の改善が有効である。そこで硬質皮膜表面に硫黄系極圧添加剤を含有した潤滑防錆油剤が塗布されていることが有効である。これは、切削加工中に切刃すくい面もしくは逃げ面において、硫黄系極圧添加剤を含有した潤滑防錆油剤中の硫黄成分と被加工物中の鉄、更に大気中の酸素が反応し、硬質皮膜最表面に酸硫化鉄層を形成し、この酸硫化鉄層が切屑生成プロセスにおける、摩耗、溶着及び凝着抑制に有効に作用し、その結果として切刃近傍における、摩擦抵抗を低減し、工具のアブレッシブ摩耗や切削加工面の品位を著しく改善することによるものである。更に、一度硬質皮膜最表面に形成した酸硫化鉄層は該硬質皮膜表面に強固に固着し、脱落し難いため、効果の持続性があり、これらの作用により切削工具の寿命を格段に向上させるとともに、工具切刃への被加工物の凝着が減少し、被加工物の加工品位及び加工精度を大幅に改善するに至った。
【０００９】
皮膜被覆過程において基体表面には微細な凹凸を形成するため、硫黄系極圧添加剤を含有した潤滑防錆油剤の付着面積が増加し、硫黄系極圧添加剤を含有した潤滑防錆油剤が硬質皮膜表面に付着し易く好ましい。
【００１０】
また、硬質皮膜を被覆し、硬質皮膜表面の凸部を除去し、硫黄系極圧添加剤を含有した潤滑防錆油剤を塗布することが更に好ましい。このことは硬質皮膜表面には微細な凹部が形成され、この凹部に硫黄系極圧添加剤を含有した潤滑防錆油剤が安定して付着し易く好ましい。硬質皮膜表面の凸部を除去するための機械的な手段としては、例えば、ＳｉＣ粉末を付着させたプラスチックブラシで硬質皮膜表面を全体的にブラッシング処理する方法、硬質粒子と軟質粒子を混合した投射材を吹き付け処理する方法、磁性粒子を用いた磁気研磨による方法、またはダイヤモンド砥粒等を用いたブラスト処理による方法がある。これらの処理法によって除去したその除去部は微細な凹部となり、硫黄を含有した油剤が凹部に保持され易いため、前述の効果が得られやすい。更に、ブラストや研摩処理によって活性化した皮膜表面が空気中の成分と反応し、工具保管期間中に意図としない反応層等の形成、例えば、酸化層の形成がなされ潤滑効果の劣化を引き起こすことから回避することができる。また、上記加工により、切刃エッジ部へ初期摩耗を与え、なじみ効果も確認され、チッピング等の異常摩耗も抑制し、相乗効果を発揮するものである。硫黄系極圧添加剤を含有した潤滑防錆油剤の切削工具への塗布方法は、刷毛、吹き付け、噴霧などが可能である。以下、実施例について説明するが、本発明は下記実施例に限定されるものではなく、適宜変更することは本発明の技術的範囲に含まれるものである。
【００１１】
【実施例】
本発明に係る該硬質皮膜を形成する方法としては、イオンプレーティング法やスパッタリング法等に代表される物理蒸着法が挙げられるが、例えばアーク放電式イオンプレーティング法による成膜においては以下による方法を用いれば良い。まず真空容器内を３×１０−^５Ｐａまで真空排気を行った後にアルゴンイオンによる基体の清浄化及び活性化を行う。その後、目的とした皮膜組成に応じて組成を調整したターゲットを用い、アーク放電により蒸発源であるカソードに設置したターゲットから組成元素をイオン化させ、窒素雰囲気中でイオンプレーティングすることによって得られる。以下、その詳細について述べる。
【００１２】
アーク放電式イオンプレーティング装置を用い、蒸発源に目的とする組成となるよう調整した金属ターゲットを設置し、下記の条件で成膜した。成膜した各皮膜組成を表１に示す。被覆条件は、基体温度５００℃、ならびに反応ガスである窒素を圧力３．５Ｐａ、バイアス電圧を−５０Ｖの条件で行った。また、被覆基体にはＲ５ｍｍの超硬合金製２枚刃ボールエンドミル及びφ８ｍｍの超硬合金製ドリルを用い、全皮膜の厚みが３乃至４μｍとなるように成膜した。
【００１３】
得られた該硬質皮膜表面に、更に、本発明例１は、潤滑防錆油剤を塗布する前にＳｉＣ粉末を付着させたプラスチックブラシで硬質皮膜表面を全体的にブラッシングし、被覆の際に付着した溶融金属である凸部を除去し、硫黄系極圧添加剤を含有した潤滑防錆油剤を塗布し、比較例７は、潤滑防錆油剤を塗布しないものを、各々作成し切削加工用試料に供した。これらの処理条件を表１、表２に示す。
【００１４】
【表１】

【００１５】
【表２】

【００１６】
更に、本発明例３、４及び比較例９、１０、１１、１２として、凸部を除去し、硫黄系極圧添加剤を含有した潤滑防錆油剤を塗布したものと、硫黄系極圧添加剤を含有しない潤滑防錆油剤を塗布したものと、潤滑防錆油剤を塗布しないものとを３０日間大気中に放置した後、これを切削加工用試料とした。図１に被覆後にＳｉＣ粉末を付着させたプラスチックブラシで硬質皮膜表面を全体的にブラッシングした後の、硬質皮膜表面の電子顕微鏡写真を示す。被覆後のブラッシング処理により、凸部である被覆中に発生した溶融金属が除去され、微細な凹部が形成されている。各種処理を施した被覆超硬ソリッドボールエンドミルの切削諸元を次に示す。２枚刃超硬ボールエンドミルを用い、直線ダウンカット、被削材Ｓ５５Ｃ（ＨＢ２２０）、軸方向切り込み２．０ｍｍ、径方向切り込み０．５ｍｍ、回転数１５０００ｍｉｎ^−１、送り５０００ｍｍ／ｍｉｎ、乾式で最大逃げ面摩耗幅が０．１５ｍｍに達するまでの切削長を表１に示す。被覆超硬ソリッドドリルの切削諸元を次に示す。２枚刃鋼用超硬ドリルを用い、被削材Ｓ５５Ｃ（ＨＢ２２０）、切削速度：１１０ｍ／ｍｉｎ、送り０．２５ｍｍ／ｒｅｖ、３０ｍｍの貫通穴を乾式で加工を行ない、切削不能に至るまでの加工穴数を表１に併記する。比較例並びに従来例に関しても、同一の切削諸元にてそれぞれ切削加工に供した。比較例並びに従来例の詳細並びに切削試験結果を表２に示す。
【００１７】
表１より明らかに、本発明例１〜４は、従来例１３、１４に比較してエンドミル、ドリル共に優れた切削寿命を示している。本発明例１に示す切削後のボールエンドミル先端部チゼルエッジの皮膜摩耗部を深さ方向に元素分析した結果を図２に示すが、最表面層は酸硫化鉄を形成していることが確認され、この酸硫化鉄層が摩耗抑制に効果的に作用するものである。また、切削加工面も従来例１３に比較して、むしれ等も減少しており、光沢のある切削加工面が得られた。更に、硬質膜被覆後に凸部を除去した後、硫黄系極圧添加剤を含有した潤滑防錆油剤を塗布することにより、更に優れた切削寿命が得られることが明確である。更に、３０日間大気中に放置した後、これを用いて切削加工を行った場合には、比較例１１、１２に対して、本発明例３、４の工具寿命は５倍程度長寿命、比較例９、１０の工具寿命はおよそ２倍程度長寿命となっており、これより潤滑防錆油剤の塗布が性能維持に有効で、更に硫黄系極圧添加剤の潤滑防錆油剤が好ましいことが確認された。
【００１８】
【発明の効果】
以上の如く、本発明の硬質皮膜被覆切削工具は、従来までの被覆切削工具に比べ優れた潤滑性を有し、被加工物との凝着及び溶着が著しい切削環境においても格段に長い工具寿命を得ることができた。これら改善した硬質皮膜被覆切削工具が切削加工における生産性の向上ならびに加工面のむしれを低減させることによる高品質加工が可能となりコスト低減に極めて有効である。更に、硬質皮膜の表面処理後の性能劣化を回避するためにも有効である。
【図面の簡単な説明】
【図１】図１は、被覆後にＳｉＣ粉末を付着させたプラスチックブラシで硬質皮膜表面を全体的にブラッシングした後の表面の電子顕微鏡写真を示す。
【図２】図２は、切削加工後の硬質皮膜摩耗表面の深さ方向元素分析結果を示す。[0001]
[Technical field to which the invention belongs]
The present invention relates to a hard film-coated tool used for dry cutting of a metal material or the like.
[0002]
[Prior art]
In recent years, in the field of machining, there has been a shift from so-called wet cutting using a cutting fluid to dry cutting without using a cutting fluid due to demands for global environmental measures. This is because conventional wet processing is regarded as a factor that impedes environmental conservation due to bad odor and scattering of cutting fluid, deterioration of working environment due to generation of oil smoke, waste oil disposal problems, air pollution, etc. is there. Under these circumstances, in high-efficiency and high-precision in recent dry cutting, the adhesion and welding phenomenon between the wear-resistant coating on the cutting tool surface and the workpiece have a significant effect on cutting performance. It can be said that For example, a high-hardness film represented by a TiAlN film that pursues wear resistance of a hard film has been put to practical use. However, by increasing the hardness of the film, the lubrication characteristics are sacrificed, and as a result, the workpiece is processed. Frictional resistance due to adhesion and welding phenomena with objects is increasing.
[0003]
[Problems to be solved by the invention]
However, in order to achieve the production of a coated tool having both wear resistance and lubrication characteristics by applying a high hardness coating and multilayering, in order to make different types of materials multilayered, There are restrictions. Moreover, although it has a lubrication characteristic by reducing the hardness of the film, the effect is only due to the self-lubricating effect, and the effect cannot be expected after the lubricating layer having low hardness is worn. In a cutting environment such as dry cutting, a satisfactory cutting life is not obtained. Furthermore, there is a problem that the flaking of the cut surface generated by the work piece adhering to the hard coating surface deteriorates the quality of the processed surface and the processing accuracy.
Further, when the coating surface is polished, the coating surface is left in an activated state in contact with the atmosphere, and there is a problem that performance such as lubricity cannot be maintained for a long time.
[0004]
The present invention has no restrictions on the coating apparatus as a means for imparting lubricity to the hard coating as a means of imparting lubricity to the hard coating with respect to the problems of wear resistance and lubrication characteristics that occur in the cutting environment in dry cutting as described above. Lubrication that makes it possible to easily impart excellent lubrication characteristics without lowering the hardness of the tool, and that can prolong the life of cutting tools and suppress adhesion and welding phenomena with work materials. An object of the present invention is to provide a hard film coated tool having excellent properties. Another object of the present invention is to maintain the performance for a long period of time by protecting the coating surface from coming into contact with the atmosphere even after the polishing treatment of the coating surface for imparting further lubricity to the coating surface.
[0005]
[Means for Solving the Problems]
The present invention provides (TiAl) N, (TiSi) (NO), (CrSi) (NBO), Cr (BN), Ti (NB), (TiSiAl) N, Ti (CN), (CrSi) N, Cr ( the hard film of the CN) was coated on the outermost surface, the convex portion of the hard coating surface was removed by a mechanical method, on the film surface, that coated with lubricant anticorrosive oil containing a sulfur-based extreme pressure additive The gist of the present invention is that it is composed of a hard film coated tool having excellent lubricity. Specifically, the lubricating rust preventive oil is based on at least one of mineral oil and synthetic oil, and sulfur-based extreme pressure additives such as sulfurized fats, sulfurized esters, sulfurized olefins, polysulfide, dibenzyl disulfide, dodecyl disulfide, 3-50% by mass of at least one selected from diphenyl disulfide, saturated fatty acid sulfide, dialkyldithiocarbamate-metal compound, and neutral sulfonate, carboxylic acid, carboxylic acid ester as rust preventive additive It is preferable that it is a lubricating rust preventive oil containing 0.5 to 17% by mass ratio of at least one selected from
[0006]
In addition, the present invention can provide further lubrication characteristics by removing the convex portions on the surface of the hard coating, and in order to maintain this performance for a long period of time, a sulfur-based extreme pressure additive is added to the surface of the hard coating. It is preferable to protect the surface of the coating from being in contact with the air by applying the contained lubricating antirust oil.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present inventors have found that the adhesion or welding phenomenon adhering to the tool cutting blade is complicated by the frictional resistance of the hard coating itself, the affinity with the workpiece or the dissociation of the deposit when the workpiece adheres to the coating. It was thought that these dominate the life of the cutting tool or the processing accuracy of the workpiece. Therefore, these improvements are extremely important in a cutting environment where adhesion or welding occurs. By applying a lubricating rust preventive oil containing a sulfur-based extreme pressure additive to the hard coating surface, the frictional resistance of the hard coating is reduced, the affinity with the workpiece or the dissociation from the workpiece is increased. In particular, the present invention has been completed.
[0008]
That is, in order to suppress the adhesion or welding phenomenon adhering to the tool cutting edge, the frictional resistance of the hard coating is reduced, the affinity with the workpiece or the dissociation of the deposit when the workpiece adheres to the coating. Improvement of sex etc. is effective. Therefore, it is effective that a lubricating anticorrosive oil containing a sulfur-based extreme pressure additive is applied to the hard coating surface. This is because the sulfur component in the lubricating rust preventive oil containing the sulfur-based extreme pressure additive reacts with iron in the workpiece, and oxygen in the atmosphere at the rake face or flank face during cutting. An iron oxysulfide layer is formed on the outermost surface of the hard coating, and this iron oxysulfide layer effectively acts to suppress wear, adhesion and adhesion in the chip generation process, resulting in a reduction in frictional resistance in the vicinity of the cutting edge. This is because the abrasive wear of the tool and the quality of the cut surface are remarkably improved. Furthermore, the iron oxysulfide layer once formed on the outermost surface of the hard coating is firmly fixed on the surface of the hard coating and is difficult to drop off, so that the effect is sustained, and the life of the cutting tool is remarkably improved by these actions. At the same time, the adhesion of the work piece to the tool cutting edge has been reduced, leading to a significant improvement in the work quality and work accuracy of the work piece.
[0009]
In order to form fine irregularities on the surface of the substrate during the coating process, the adhesion area of the lubricating rust preventive oil containing the sulfur-based extreme pressure additive increases, and the lubricating rust preventive oil containing the sulfur-based extreme pressure additive increases. It is preferable because it easily adheres to the surface of the hard coating.
[0010]
Further, it is more preferable to coat the hard coating, remove the convex portions on the surface of the hard coating, and apply a lubricating rust preventive oil containing a sulfur-based extreme pressure additive. This is preferable because fine concave portions are formed on the surface of the hard coating, and the lubricating rust preventive oil containing the sulfur-based extreme pressure additive is easily and stably adhered to the concave portions. Examples of mechanical means for removing convex portions on the surface of the hard coating include a method of entirely brushing the surface of the hard coating with a plastic brush to which SiC powder is attached, and a projection in which hard particles and soft particles are mixed. There are a method of spraying a material, a method of magnetic polishing using magnetic particles, and a method of blasting using diamond abrasive grains. The removed portion removed by these treatment methods becomes a fine concave portion, and the oil containing sulfur is easily held in the concave portion, so that the above-described effects are easily obtained. Furthermore, the surface of the film activated by blasting or polishing treatment reacts with components in the air, and unintended reaction layers, for example, formation of an oxide layer, etc., occur during the tool storage period, causing deterioration of the lubrication effect. Can be avoided. In addition, by the above processing, initial wear is given to the edge portion of the cutting edge, a conforming effect is confirmed, abnormal wear such as chipping is suppressed, and a synergistic effect is exhibited. Brushes, sprays, sprays, and the like can be applied to the cutting tool by applying the lubricating rust preventive oil containing the sulfur-based extreme pressure additive to the cutting tool. Hereinafter, examples will be described, but the present invention is not limited to the following examples, and appropriate modifications are included in the technical scope of the present invention.
[0011]
【Example】
Examples of the method for forming the hard film according to the present invention include physical vapor deposition methods represented by ion plating method and sputtering method. For example, in film formation by arc discharge ion plating method, the following method is used. Should be used. First performed cleaning and activation of the substrate with argon ions after the evacuation of the vacuum vessel to 3 × 10- 5 ^Pa. Thereafter, using a target whose composition is adjusted according to the intended film composition, the composition element is ionized from the target placed on the cathode as the evaporation source by arc discharge, and ion plating is performed in a nitrogen atmosphere. The details will be described below.
[0012]
Using an arc discharge ion plating apparatus, a metal target adjusted to have a desired composition was installed in the evaporation source, and a film was formed under the following conditions. Table 1 shows the composition of each film formed. The coating conditions were a substrate temperature of 500 ° C., nitrogen as a reaction gas, a pressure of 3.5 Pa, and a bias voltage of −50V. In addition, an R5 mm cemented carbide two-blade ball end mill and a φ8 mm cemented carbide drill were used for the coated substrate, and the total coating thickness was 3 to 4 μm.
[0013]
Further, on the surface of the hard film thus obtained, Example 1 of the present invention brushes the entire surface of the hard film with a plastic brush to which SiC powder is adhered before applying the lubricating rust preventive oil, and adheres to the surface of the hard film. The convex part which is a molten metal was removed, and a lubricating rust preventive oil containing a sulfur-based extreme pressure additive was applied, and Comparative Example 7 was prepared without cutting a lubricant and a rust preventive oil. It was used for. These processing conditions are shown in Tables 1 and 2.
[0014]
[Table 1]

[0015]
[Table 2]

[0016]
Further, as Invention Examples 3 and 4 and Comparative Examples 9 , 10 , 11 , and 12 , the protrusions were removed, and a lubricating rust preventive oil containing a sulfur-based extreme pressure additive was applied, and sulfur-based extreme pressure addition A sample coated with a lubricating rust preventive oil and a sample not coated with a lubricating rust preventive oil were left in the air for 30 days, and then used as a cutting sample. FIG. 1 shows an electron micrograph of the surface of the hard coating after the entire surface of the hard coating is brushed with a plastic brush to which SiC powder is adhered after coating. By the brushing process after coating, the molten metal generated in the coating, which is a convex portion, is removed, and fine concave portions are formed. The cutting specifications of a coated solid carbide ball end mill with various treatments are shown below. Using a 2-flute carbide ball end mill, straight down cut, work material S55C (HB220), axial cut 2.0 mm, radial cut 0.5 mm, rotational speed 15000 min ⁻¹ , feed 5000 mm / min, maximum in dry type Table 1 shows the cutting length until the flank wear width reaches 0.15 mm. The cutting specifications of the coated solid carbide drill are as follows. Using a two-blade steel carbide drill, work material S55C (HB220), cutting speed: 110 m / min, feed 0.25 mm / rev, 30 mm through hole is processed dry, until cutting is impossible The number of processed holes is also shown in Table 1. The comparative example and the conventional example were each subjected to cutting with the same cutting specifications. Table 2 shows the details of the comparative example and the conventional example and the cutting test results.
[0017]
Obviously from Table 1, Examples 1-4 of the present invention show superior cutting lives for both end mills and drills as compared to Conventional Examples 13 and 14 . FIG. 2 shows the result of elemental analysis in the depth direction of the wear part of the tip end chisel edge of the ball end mill after cutting shown in Example 1 of the present invention. It was confirmed that the outermost surface layer formed iron oxysulfide. The iron oxysulfide layer effectively acts to suppress wear. In addition, the cutting surface was also less wrinkled as compared with Conventional Example 13 , and a glossy cutting surface was obtained. Furthermore, it is clear that a further excellent cutting life can be obtained by removing the convex portion after coating the hard film and then applying a lubricating rust preventive oil containing a sulfur-based extreme pressure additive. Further, when the sample was left in the atmosphere for 30 days and then cut using this, the tool life of Examples 3 and 4 of the present invention was about 5 times longer than that of Comparative Examples 11 and 12 . The tool life of Examples 9 and 10 is about twice as long, and from this, the application of a lubricating rust preventive oil is effective for maintaining the performance, and a lubricating rust preventive oil of a sulfur-based extreme pressure additive is preferable. confirmed.
[0018]
【The invention's effect】
As described above, the hard-coated coated cutting tool of the present invention has excellent lubricity compared to conventional coated cutting tools, and has a remarkably long tool life even in a cutting environment in which adhesion and welding to a workpiece are significant. Could get. These improved hard coating coated cutting tools enable high quality processing by improving productivity in cutting and reducing unevenness of the processed surface, and are extremely effective for cost reduction. Furthermore, it is also effective for avoiding performance deterioration after the surface treatment of the hard coating.
[Brief description of the drawings]
FIG. 1 shows an electron micrograph of a surface after the entire surface of a hard coating is brushed with a plastic brush to which SiC powder is applied after coating.
FIG. 2 shows the result of elemental analysis in the depth direction of the hard film wear surface after cutting.

Claims

Hard of (TiAl) N, (TiSi) (NO), (CrSi) (NBO), Cr (BN), Ti (NB), (TiSiAl) N, Ti (CN), (CrSi) N, Cr (CN) the film was coated on the outermost surface, the convex portion of the hard coating surface was removed by a mechanical method, to the film surface, characterized in that it is coated with a lubricating rust oil containing a sulfur-based extreme pressure additive lubricant Hard film coated tool with excellent properties.

The hard coating tool according to claim 1, wherein the lubricating rust preventive oil comprises at least one of a mineral oil and a synthetic oil as a base oil, and a sulfur-based extreme pressure additive as a sulfurized fat, sulfurized ester, sulfurized olefin, polysulfide, disulfide. Contains at least one selected from benzyl disulfide, dodecyl disulfide, diphenyl disulfide, saturated fatty acid sulfide, dialkyldithiocarbamate-metal compound in a mass ratio of 3 to 50%, and is neutral as a rust preventive additive A hard film coated tool excellent in lubricity, characterized by applying a lubricating rust preventive oil containing 0.5 to 17% by mass of at least one selected from sulfonate, carboxylic acid and carboxylic acid ester .