JP2012011471A - Cutting insert - Google Patents
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- JP2012011471A JP2012011471A JP2010147260A JP2010147260A JP2012011471A JP 2012011471 A JP2012011471 A JP 2012011471A JP 2010147260 A JP2010147260 A JP 2010147260A JP 2010147260 A JP2010147260 A JP 2010147260A JP 2012011471 A JP2012011471 A JP 2012011471A
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この発明は、立方晶窒化ほう素基焼結体、多結晶ダイヤモンド基焼結体等で構成された切削加工用インサートに関し、特に、合金鋼、軸受鋼等の焼入れ材からなる高硬度鋼の仕上げ切削加工あるいはＡｌ合金、Ｃｕ合金等の非鉄金属材料の仕上げ切削加工において、境界摩耗の発生を抑制し得るとともに、すぐれた仕上げ面精度を長期の使用にわたって維持し得る切削加工用インサートに関するものである。 The present invention relates to a cutting insert composed of a cubic boron nitride-based sintered body, a polycrystalline diamond-based sintered body, and the like, and in particular, finishes of high hardness steel made of a quenching material such as alloy steel and bearing steel. The present invention relates to an insert for cutting that can suppress the occurrence of boundary wear and can maintain excellent finished surface accuracy over a long period of use in cutting or finishing cutting of non-ferrous metal materials such as Al alloy and Cu alloy. .
従来、仕上げ切削加工用インサートとしては、立方晶窒化ほう素（以下、ｃＢＮで示す）基焼結体、多結晶ダイヤモンド（以下、ＰＣＤで示す）基焼結体等が用いられているが、仕上げ切削加工における被削材の仕上げ面精度の向上を目的として種々の提案がなされている。
例えば、特許文献１に示されるように、ｃＢＮ基焼結体製切削工具の表面（特に、すくい面）にＴｉＮ皮膜を形成した切削工具（従来インサート１という）は、切屑の溶着を抑制することができるため、溶着発生を原因とする仕上げ面精度の低下を防止し得るとされている。
また、例えば、特許文献２に示されるように、摩耗境界部分に、複数の曲率半径のコーナ群を備えたインサート（従来インサート２という）を用いて切削加工を行うことにより、被削材の仕上げ面精度を改善できることが知られている。
Conventionally, cubic boron nitride (hereinafter referred to as cBN) -based sintered bodies, polycrystalline diamond (hereinafter referred to as PCD) -based sintered bodies, etc. have been used as inserts for finish cutting. Various proposals have been made for the purpose of improving the accuracy of the finished surface of the work material in cutting.
For example, as shown in Patent Document 1, a cutting tool (referred to as a conventional insert 1) in which a TiN film is formed on the surface (particularly, rake face) of a cutting tool made of a cBN-based sintered body suppresses chip welding. Therefore, it is said that the finish surface accuracy can be prevented from being lowered due to the occurrence of welding.
Moreover, for example, as shown in Patent Document 2, the work material is finished by performing cutting using an insert (referred to as the conventional insert 2) having a plurality of corners of curvature radius at the wear boundary portion. It is known that surface accuracy can be improved.
しかし、上記の従来インサートを用いて仕上げ切削加工を行った場合、例えば、従来インサート１を用いて高硬度被削材の仕上げ切削加工を行った場合には、ＴｉＮ皮膜が切削途中で剥離してしまうため、溶着抑制効果が持続せず、長期の使用に亘って十分な仕上げ面精度を維持できないという問題点があり、また、従来インサート２を用いて高硬度被削材の仕上げ切削加工を行った場合には、大きな曲率半径のコーナ部において切削抵抗が大きくなるため、ビビリが発生しやすく、これによって十分に満足できる仕上げ面精度は得られないという問題点があった。
さらに、ＰＣＤ（多結晶ダイヤモンド）基焼結体製切削加工用インサート（以下、ＰＣＤインサートという）についても、通常、Ａｌ合金、Ｃｕ合金等の仕上げ切削加工に用いられているが、摩耗の進行とともに溶着が激しくなるため、長期の使用に亘って、すぐれた仕上げ面精度を維持することができないという問題点があった。
However, when finishing cutting is performed using the above-described conventional insert, for example, when finishing cutting of a high-hardness work material is performed using the conventional insert 1, the TiN film peels off during cutting. Therefore, there is a problem that the effect of suppressing welding is not maintained, and there is a problem that sufficient finished surface accuracy cannot be maintained over a long period of use, and finishing cutting of a high-hardness work material is performed using the conventional insert 2. In such a case, the cutting resistance becomes large at the corner portion having a large curvature radius, so that chatter is likely to occur, and this makes it impossible to obtain a sufficiently satisfactory finished surface accuracy.
Furthermore, PCD (polycrystalline diamond) -based sintered cutting inserts (hereinafter referred to as PCD inserts) are usually used for finish cutting of Al alloys, Cu alloys, etc., but as wear progresses Since the welding becomes intense, there has been a problem that excellent finished surface accuracy cannot be maintained over a long period of use.
そこで、本発明者等は、合金鋼、軸受鋼等の焼入れ材からなる高硬度鋼の仕上げ切削加工あるいはＡｌ合金、Ｃｕ合金等の非鉄金属材料の仕上げ切削加工において、すぐれた仕上げ面精度を長期の使用にわたって発揮すべく、境界摩耗の発生・進展を抑制することができるインサート形状について鋭意研究を行った結果、
ｃＢＮ基焼結体あるいはＰＣＤ基焼結体から所定形状のインサートを作製した後、図１（ａ）〜（ｃ）に示すように、インサートの逃げ面に、切れ刃稜線と平行に複数の溝を形成し、かつ、該溝のテラス幅、溝幅及び溝高さが特定の数値範囲になるように溝形状を定めたところ、ｃＢＮインサート及びＰＣＤインサートのいずれについても、境界摩耗の発生が低減され、その結果、長期の使用に亘って、すぐれた仕上げ面精度を維持しつつ、同時にすぐれた耐摩耗性を発揮し得ることを見出したのである。
Accordingly, the present inventors have provided excellent finished surface accuracy for a long period of time in finish cutting of hardened steel made of hardened materials such as alloy steel and bearing steel, or finish cutting of non-ferrous metal materials such as Al alloy and Cu alloy. As a result of earnest research on the insert shape that can suppress the occurrence and progress of boundary wear,
After an insert having a predetermined shape is prepared from a cBN-based sintered body or a PCD-based sintered body, a plurality of grooves are formed on the flank face of the insert in parallel with the cutting edge ridge line as shown in FIGS. , And the groove shape is determined so that the terrace width, groove width, and groove height of the groove are in a specific numerical range. As a result, the occurrence of boundary wear is reduced for both cBN inserts and PCD inserts. As a result, it has been found that excellent wear resistance can be exhibited while maintaining excellent finished surface accuracy over a long period of use.
この発明は、上記知見に基づいてなされたものであって、
「（１） 切削加工用インサートの逃げ面に、切れ刃稜線と平行に複数の溝が形成され、該溝は、テラス幅５〜２５μｍ、溝幅１〜５μｍ、溝高さ０．５〜６μｍの溝形状を有することを特徴とする切削加工用インサート。
（２） 切削加工用インサートが、立方晶窒化ほう素基焼結体で構成されていることを特徴とする請求項１に記載の切削加工用インサート。
（３） 切削加工用インサートが、多結晶ダイヤモンド基焼結体で構成されていることを特徴とする請求項１に記載の切削加工用インサート。」
を特徴とするものである。
This invention has been made based on the above findings,
“(1) A plurality of grooves are formed on the flank face of the cutting insert in parallel with the cutting edge ridge line. The grooves have a terrace width of 5 to 25 μm, a groove width of 1 to 5 μm, and a groove height of 0.5 to 6 μm. A cutting insert having a groove shape of
(2) The cutting insert according to claim 1, wherein the cutting insert is made of a cubic boron nitride-based sintered body.
(3) The cutting insert according to claim 1, wherein the cutting insert is made of a polycrystalline diamond-based sintered body. "
It is characterized by.
以下、本発明について説明する。
図１に、本発明の切削加工用インサート（以下、単に、インサートという）一つの具体例を示すが、図１（ａ）は、切れ刃稜線と平行に複数の溝が形成された三角形状の本発明インサートの斜視外観図、図１（ｂ）は、同インサートの逃げ面の拡大図、図１（ｃ）は、同インサートの逃げ面の断面模式図である。
図１（ａ）に示すように、本発明インサートは、その逃げ面に、切れ刃稜線と平行に複数の溝（図１（ａ）では、５本の溝）が形成されており、このような本発明インサートを仕上げ切削加工に供した場合、切れ刃に生じた摩耗が次第に進展するが、図１（ｂ）に示すように、本発明インサートでは、切れ刃稜線と平行に複数の溝（図１（ｂ）の溝部）が設けられていることにより、該溝によって摩耗進行が食い止められ、その結果、境界摩耗（図１（ｂ）の境界摩耗）の発生・進展が抑制される。
したがって、本発明インサートでは、シャープな刃先を長期間の使用に亘って維持することができ、良好な仕上げ面精度が得られ、かつ、長期の使用に亘ってすぐれた耐摩耗性を発揮し、工具の長寿命化が図られる。
The present invention will be described below.
FIG. 1 shows one specific example of the cutting insert of the present invention (hereinafter simply referred to as an insert). FIG. 1 (a) shows a triangular shape in which a plurality of grooves are formed in parallel with the cutting edge ridge line. FIG. 1B is an enlarged view of the flank face of the insert, and FIG. 1C is a schematic cross-sectional view of the flank face of the insert.
As shown in FIG. 1 (a), the insert according to the present invention has a plurality of grooves (five grooves in FIG. 1 (a)) formed on the flank thereof in parallel with the cutting edge ridgeline. When the insert of the present invention is subjected to finish cutting, the wear generated on the cutting edge gradually progresses. However, as shown in FIG. 1 (b), in the insert of the present invention, a plurality of grooves ( By providing the groove portion in FIG. 1B, the progress of wear is stopped by the groove, and as a result, the occurrence / progress of boundary wear (boundary wear in FIG. 1B) is suppressed.
Therefore, in the present invention insert, it is possible to maintain a sharp cutting edge over a long period of use, a good finished surface accuracy is obtained, and excellent wear resistance is demonstrated over a long period of use. The tool life can be extended.
図１（ｃ）に、本発明インサートの溝の具体的な形状寸法の一例を示す。
図１（ｃ）では、５本の溝が形成され、各溝のテラス幅は２５μｍ、溝幅は５μｍ、溝高さは３μｍとされている。
本発明では、切れ刃稜線と平行に形成する溝のサイズは、それぞれ、テラス幅５〜２５μｍ、溝幅１〜５μｍ、溝高さ０．５〜６μｍとし、また、本発明で形成する溝の数は、２〜５本とすることが望ましい。
ここで、テラス幅が５μｍより小さくなると強度が不足して欠損が発生する可能性が高くなり、一方、２５μｍを超えると切削液の回りこみが不十分となることから、テラス幅は５〜２５μｍとする。
溝幅は、これが１μｍより小さくなると切削液を溝に保持することが難しくなり、一方、５μｍを超えると切屑が溝に入り込み溶着が発生しやすくなることから、溝幅は、１〜５μｍと定めた。
溝高さは、これが０．５μｍより小さくなると摩耗進行を分断する効果が少なくなり、一方、６μｍを超えるとテラス幅に対して溝が深くなりすぎてテラス部の破損を生じやすくなることから、溝高さは０．５〜６μｍと定めた。
FIG. 1 (c) shows an example of a specific shape and dimension of the groove of the insert of the present invention.
In FIG. 1C, five grooves are formed, and the terrace width of each groove is 25 μm, the groove width is 5 μm, and the groove height is 3 μm.
In the present invention, the sizes of the grooves formed in parallel with the cutting edge ridge line are terrace widths of 5 to 25 μm, groove widths of 1 to 5 μm, and groove heights of 0.5 to 6 μm, respectively. The number is preferably 2 to 5.
Here, if the terrace width is smaller than 5 μm, there is a high possibility that the strength is insufficient and a defect occurs. On the other hand, if the terrace width exceeds 25 μm, the cutting fluid wraps around insufficiently, so the terrace width is 5 to 25 μm. And
If the groove width becomes smaller than 1 μm, it becomes difficult to hold the cutting fluid in the groove. On the other hand, if the groove width exceeds 5 μm, chips enter the groove and welding easily occurs. Therefore, the groove width is determined to be 1 to 5 μm. It was.
If the groove height is smaller than 0.5 μm, the effect of dividing the progress of wear is reduced. On the other hand, if it exceeds 6 μm, the groove becomes too deep with respect to the terrace width and the terrace portion is likely to be damaged. The groove height was set to 0.5 to 6 μm.
本発明インサートにおいて、その逃げ面に、例えば、レーザー加工によって、切れ刃稜線と平行に複数の溝を形成することができるが、平滑な溝仕上げを行うためには、紫外域波長のレーザーを用いてレーザー加工を行うことが望ましい。
例えば、ＹＡＧレーザーの４倍波を用いて、出力１Ｗ、走査速度１０ｍｍ／ｓｅｃ、繰り返し１０ｋＨｚの条件でレーザー加工することにより、インサートのすくい面に、本発明で規定する形状・寸法の溝を、形成することができる。
In the insert of the present invention, a plurality of grooves can be formed on the flank face in parallel with the cutting edge ridge line by, for example, laser processing. In order to achieve a smooth groove finish, an ultraviolet wavelength laser is used. It is desirable to perform laser processing.
For example, by using a fourth harmonic of a YAG laser and performing laser processing under conditions of an output of 1 W, a scanning speed of 10 mm / sec, and a repetition rate of 10 kHz, a groove having a shape and size specified in the present invention is formed on the rake face of the insert. Can be formed.
本発明の切削加工用インサートは、その逃げ面に、切れ刃稜線と平行に所定形状の複数の溝が形成されていることによって、これを仕上げ切削加工に供した場合、上記溝によって、境界摩耗の発生・進展が抑制されるため、シャープな刃先を維持することができ、また、長期間の使用に亘って良好な仕上げ面精度とすぐれた耐摩耗性が得ることができる。 The insert for cutting according to the present invention has a plurality of grooves having a predetermined shape formed on the flank face in parallel with the cutting edge ridge line. When this is subjected to finish cutting, the groove causes boundary wear. Since generation | occurrence | production and progress of are suppressed, a sharp blade edge | tip can be maintained and the favorable finishing surface precision and the outstanding abrasion resistance can be obtained over a long-term use.
つぎに、本発明の切削加工用インサートを実施例により具体的に説明する。 Next, the cutting insert of the present invention will be specifically described with reference to examples.
最初に、ｃＢＮインサートの実施例について説明する。
（ａ）ｃＢＮインサートの硬質相を構成する１〜３μｍの平均粒径のｃＢＮ粉末と、結合相を構成する１〜３μｍのＴｉＮ粉末およびＡｌ２Ｏ３粉末とを、容量％にて、ｃＢＮ粉末：（ＴｉＮ粉末＋Ａｌ２Ｏ３粉末）＝１：１の割合となるように配合調製し、これをボールミルで７２時間、アセトンを用いて湿式混合する。
（ｂ）得られた混合粉末を乾燥後、油圧プレスにて１ＭＰａの圧力で成形する。
（ｃ）成形体を、真空中１Ｐａ、１０００℃×３０分の条件で熱処理し、揮発成分および粉末表面への吸着成分を除去する。
（ｄ）成形体とＷＣ超硬合金を積層し、圧力５Ｇａ、温度１５００℃、保持時間３０分の条件で超高圧高温処理し、ｃＢＮ焼結体を作製する。
（ｅ）ｃＢＮ焼結体をワイヤ放電加工機で所定寸法に切断する。
（ｆ）ＷＣ超硬合金製インサート本体のコーナ部に設けたくぼみに、切断したｃＢＮ片を重ねあわせ、９５０℃でＡｇ−Ｃｕ−Ｔｉ系ろう材でろう付けする。
（ｇ）上下面および外周研磨、ホーニング処理を施し、ＣＮＧＡ１２０４０８に規定する形状のｃＢＮインサート１〜１０を作製する。
（ｈ）上記で得たｃＢＮインサート１〜１０の逃げ面に、ＹＡＧレーザーの４倍波を用いて、出力１Ｗ、走査速度１０ｍｍ／ｓｅｃ、繰り返し１０ｋＨｚの条件でレーザー加工を施し、表１に示される寸法形状の溝を形成することにより、本発明インサート１〜１０を作製した。
First, an example of a cBN insert will be described.
(A) A cBN powder comprising cBN powder having an average particle diameter of 1 to 3 μm constituting the hard phase of the cBN insert, and 1 to 3 μm TiN powder and Al 2 O 3 powder constituting the binder phase in a volume%. : (TiN powder + Al 2 O 3 powder) = 1 and mixed at a ratio of 1: 1, and this is wet mixed with acetone in a ball mill for 72 hours.
(B) The obtained mixed powder is dried and then molded with a hydraulic press at a pressure of 1 MPa.
(C) The formed body is heat-treated in vacuum at 1 Pa and 1000 ° C. for 30 minutes to remove volatile components and components adsorbed on the powder surface.
(D) A compact and a WC cemented carbide are laminated, and subjected to ultra-high pressure and high temperature treatment under conditions of pressure 5 Ga, temperature 1500 ° C., and holding time 30 minutes to produce a cBN sintered body.
(E) The cBN sintered body is cut into a predetermined size with a wire electric discharge machine.
(F) The cBN pieces that have been cut are superposed on the recesses provided in the corners of the WC cemented carbide insert body, and brazed with an Ag—Cu—Ti brazing material at 950 ° C.
(G) Upper and lower surface and outer periphery polishing and honing are performed to prepare cBN inserts 1 to 10 having a shape defined in CNGA120408.
(H) The flank of the cBN inserts 1 to 10 obtained above was subjected to laser processing using a fourth harmonic of a YAG laser under the conditions of an output of 1 W, a scanning speed of 10 mm / sec, and a repetition of 10 kHz. The inserts 1 to 10 of the present invention were produced by forming a groove having a dimension and shape.
比較のため、上記（ａ）〜（ｇ）にしたがってｃＢＮインサート１〜１０を作製した後、各インサートの逃げ面にレーザー加工を行い、表２に示される溝（本発明外の寸法形状の溝）を形成することにより、比較例インサート１〜１０を作製した。 For comparison, after cBN inserts 1 to 10 were produced according to the above (a) to (g), the flank face of each insert was subjected to laser processing, and grooves shown in Table 2 (grooves having dimensions and shapes outside of the present invention). Comparative Example Inserts 1-10 were produced.
上記本発明インサート１〜１０、比較例インサート１〜１０の溝の寸法形状については、レーザ顕微鏡により観察・測定した。測定箇所と方法は、インサートの刃先コーナ部と直線部の交点近傍の直線側で５点測定し平均値を求めた。また、図１（ｃ）に示すようにテラス幅、溝幅は溝の入口側の大きさとし、高さは溝の最大深さとした。
表１、表２に、溝の寸法形状を示す。
About the dimension shape of the groove | channel of the said this invention insert 1-10 and comparative example insert 1-10, it observed and measured with the laser microscope. As for the measurement location and method, five points were measured on the straight line side in the vicinity of the intersection of the edge portion of the insert and the straight line portion, and the average value was obtained. Further, as shown in FIG. 1C, the terrace width and groove width are the sizes on the inlet side of the grooves, and the height is the maximum depth of the grooves.
Tables 1 and 2 show the dimensions and shapes of the grooves.
つぎに、上記本発明インサート１〜１０および比較例インサート１〜１０について、次の切削条件で合金鋼の焼入れ材の連続湿式仕上げ切削加工試験を行った。
被削材： ＳＣｒ４２０の焼入れ材（ＨＲｃ６０）の丸棒、
切削速度： ２００ ｍ／ｍｉｎ．、
送り： ０．１５ ｍｍ／ｒｅｖ、
切込み： ０．２ ｍｍ、
切削距離： ２ ｋｍ、
本発明インサート１〜１０については、試験を開始し２０００ｍ切削後の仕上げ面粗さを触針式表面粗さ測定器により測定した。
比較例インサート１〜１０については、欠損等の発生を原因とし、切削距離２ｋｍに届かずに寿命に至ったため、寿命に至るまでの切削距離を測定した。
これらの測定結果を表１、表２に示す。
Next, a continuous wet finish cutting test of a hardened material of the alloy steel was performed on the above-described inserts 1 to 10 according to the present invention and comparative inserts 1 to 10 under the following cutting conditions.
Work material: Round bar of quenching material (HRc60) of SCr420,
Cutting speed: 200 m / min. ,
Feed: 0.15 mm / rev,
Cutting depth: 0.2 mm,
Cutting distance: 2 km,
About this invention insert 1-10, the test was started and the finished surface roughness after 2000 m cutting was measured with the stylus type surface roughness measuring device.
About comparative example inserts 1-10, since it reached the end of life without reaching the cutting distance of 2 km due to the occurrence of defects or the like, the cutting distance until the end of the life was measured.
The measurement results are shown in Tables 1 and 2.
次に、ＰＣＤインサートの実施例について説明する。
（ａ）ＰＣＤインサートの硬質相を構成する６〜１２μｍの平均粒径のダイヤモンド粉末を、ダイヤモンド層厚みが１ｍｍになるように秤量し、ＷＣ超硬合金と積層し、圧力５．５Ｇａ、温度１５００℃、保持時間３０分の条件で超高圧高温処理し、ＰＣＤ焼結体を作製する。
（ｂ）ＰＣＤ焼結体をワイヤ放電加工機で所定寸法に切断する。
（ｃ）ＷＣ超硬合金製インサート本体のコーナ部に設けたくぼみに、切断したＰＣＤ片を重ねあわせ、８００℃でＡｇ−Ｃｕ−Ｔｉ−Ｉｎ系ろう材でろう付けする。
（ｄ）上下面および外周研磨、ホーニング処理を施し、ＴＮＧＡ１６０４０８に規定する形状のＰＣＤインサート１１〜２０を作製する。
（ｅ）上記で得たＰＣＤインサート１１〜２０の逃げ面に、ＹＡＧレーザーの４倍波を用いて、出力１Ｗ、走査速度１０ｍｍ／ｓｅｃ、繰り返し１０ｋＨｚの条件でレーザー加工を施し、表３に示される寸法形状の溝を形成することにより、本発明インサート１１〜２０を作製した。
Next, an example of the PCD insert will be described.
(A) Diamond powder having an average particle diameter of 6 to 12 μm constituting the hard phase of the PCD insert is weighed so that the thickness of the diamond layer is 1 mm, laminated with the WC cemented carbide, pressure 5.5 Ga, temperature 1500 An ultra-high pressure and high temperature treatment is performed under the conditions of ℃ and holding time of 30 minutes to produce a PCD sintered body.
(B) The PCD sintered body is cut into a predetermined size with a wire electric discharge machine.
(C) The cut PCD piece is overlaid on the recess provided in the corner of the WC cemented carbide insert body, and brazed with an Ag—Cu—Ti—In brazing material at 800 ° C.
(D) The upper and lower surfaces and the outer periphery are polished and a honing process is performed to produce PCD inserts 11 to 20 having a shape defined in TNGA160408.
(E) The flank surfaces of the PCD inserts 11 to 20 obtained above were subjected to laser processing under the conditions of an output of 1 W, a scanning speed of 10 mm / sec, and a repetition rate of 10 kHz using a fourth harmonic of a YAG laser. The inserts 11 to 20 of the present invention were produced by forming a groove having a dimension and shape.
比較のため、上記（ａ）〜（ｅ）にしたがってＰＣＤインサート１１〜２０を作製した後、各インサートの逃げ面にレーザー加工を行い、表４に示される溝（本発明外の寸法形状の溝）を形成することにより、比較例インサート１１〜２０を作製した。 For comparison, after producing the PCD inserts 11 to 20 according to the above (a) to (e), laser processing is performed on the flank of each insert, and the grooves shown in Table 4 (grooves having dimensions and shapes outside the present invention) are shown. Comparative Example Inserts 11 to 20 were produced.
上記本発明インサート１１〜２０、比較例インサート１１〜２０の溝の寸法形状については、レーザ顕微鏡により観察・測定した。測定方法と測定箇所の定義は、ｃＢＮインサートの場合と同様である。
表３、表４に、溝の寸法形状を示す。
About the dimension shape of the said insert 11-20 of this invention and the comparative example inserts 11-20, it observed and measured with the laser microscope. The measurement method and the definition of the measurement location are the same as in the case of cBN insert.
Tables 3 and 4 show the dimensions and shapes of the grooves.
つぎに、上記本発明インサート１１〜２０および比較例インサート１１〜２０について、次の切削条件で高Ｓｉ−Ａｌ合金の連続湿式仕上げ切削加工試験を行った。
被削材： Ａ３９０−Ｔ６処理の丸棒、
切削速度： １，０００ ｍ／ｍｉｎ．、
送り： ０．１ ｍｍ／ｒｅｖ、
切込み： ０．２ ｍｍ、
切削距離： ２０ ｋｍ、
本発明インサート１１〜２０については、試験を開始し２００００ｍ切削後の仕上げ面粗さを触針式表面粗さ測定器により測定した。
比較例インサート１１〜２０については、欠損等の発生を原因とし、切削距離２０ｋｍに届かずに寿命に至ったため、寿命に至るまでの切削距離を測定した。
これらの測定結果を表３、表４に示す。
Next, the above-mentioned inserts 11 to 20 of the present invention and comparative inserts 11 to 20 were subjected to a continuous wet finish cutting test of a high Si—Al alloy under the following cutting conditions.
Work material: A390-T6 treated round bar,
Cutting speed: 1,000 m / min. ,
Feed: 0.1 mm / rev,
Cutting depth: 0.2 mm,
Cutting distance: 20 km,
About this invention insert 11-20, the test was started and the finished surface roughness after 20000 m cutting was measured with the stylus type surface roughness measuring device.
About the comparative example inserts 11-20, since it reached | attained the lifetime without reaching the cutting distance 20km because of generation | occurrence | production of a defect | deletion etc., the cutting distance until it reached the lifetime was measured.
The measurement results are shown in Tables 3 and 4.
表１〜４に示される結果から、本発明の切削加工用インサートは、その逃げ面に、切れ刃稜線と平行に所定形状の複数の溝が形成されていることによって、高硬度鋼の仕上げ切削加工においても、境界摩耗の発生・進展が抑制されるため、良好な仕上げ面精度が得ることができ、同時に、長期間の使用に亘ってすぐれた切削性能を発揮した。
これに対して、本発明で規定する溝形状から外れる溝を形成した比較例の切削加工用インサートでは、境界摩耗の発生・進展により短時間で欠損等が発生するため、短時間で使用寿命に至ることは明らかである。
From the results shown in Tables 1 to 4, the cutting insert according to the present invention has a flank face formed with a plurality of grooves having a predetermined shape in parallel with the cutting edge ridgeline. Also in machining, since the occurrence and progress of boundary wear is suppressed, good finished surface accuracy can be obtained, and at the same time, excellent cutting performance has been demonstrated over a long period of use.
On the other hand, in the cutting insert of the comparative example in which the groove deviating from the groove shape specified in the present invention is formed, chipping or the like occurs in a short time due to the occurrence / progress of boundary wear. It is clear that
この発明の切削加工用インサートは、ｃＢＮインサートを用いた高硬度鋼の仕上げ切削およびＰＣＤインサートを用いたＡｌ合金、Ｃｕ合金等の非鉄金属材料の仕上げ切削のいずれにおいても、すぐれた仕上げ面精度を長時間に亘って維持することが可能である。 The insert for cutting according to the present invention has excellent finished surface accuracy in both finish cutting of high hardness steel using cBN insert and finishing cutting of non-ferrous metal materials such as Al alloy and Cu alloy using PCD insert. It can be maintained for a long time.
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| WO2018221300A1 (en) * | 2017-05-29 | 2018-12-06 | 京セラ株式会社 | Cutting insert, cutting tool provided with same, and method for manufacturing cut workpiece |
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