JP2006346788A - Edge replaceable rotary tool - Google Patents
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Abstract
Description
本願発明は、インサートを着脱可能に取り付けた刃先交換式回転工具（以下、単に切削工具と称する。）であり、詳細には特に高送りに適する切削工具の小径化に関する。 The present invention relates to a blade-exchangeable rotary tool (hereinafter simply referred to as a cutting tool) to which an insert is detachably attached, and particularly relates to a reduction in diameter of a cutting tool particularly suitable for high feed.
特許文献１は、主切刃の切り込み角を３度以上３５度以下とし、被材削材の立ち壁部を形成する場合、被削材に接触する切れ刃長さが大きくなることを回避してほぼ一定となるように工夫され、特許文献２は、切削工具の小径化に配慮した技術が記載されている。 In Patent Document 1, when the cutting angle of the main cutting edge is set to 3 degrees or more and 35 degrees or less and the standing wall portion of the work material is formed, it is avoided that the cutting edge length contacting the work material is increased. Thus, Patent Document 2 describes a technique that takes into account a reduction in the diameter of a cutting tool.
特許文献１、２は、切れ刃の最下点における形状を考慮し、切り屑の形態や排出性まで言及したものではない。本願発明の解決課題は、切り屑の形態や排出性を改善し、等高線加工などにおける高能率加工時の欠損等のトラブルを回避することである。 Patent Documents 1 and 2 do not refer to the shape and discharge of chips in consideration of the shape at the lowest point of the cutting edge. The problem to be solved by the present invention is to improve the shape and discharge of chips and avoid troubles such as defects during high-efficiency machining in contour line machining.
本願発明は、インサートが着脱可能な刃先交換式回転工具において、該刃先交換式回転工具は、直径３５ｍｍ以下で、且つ、３枚刃以上からなり、該インサートは、中央取り付け穴を有する略平行４辺形平板状であり、該略平行４辺形平板状の長辺側の２辺は工具本体との拘束面であり、短辺側２辺は略直線部を有する主切れ刃稜線であり、該長辺側の２辺間の距離をｗ、該短辺側他の２辺間の距離をｇ、該インサートの厚さをｔ、該中央取り付け穴の直径をＰとした時、該インサートのｗとｔとＰからなる断面積Ａが５ｍｍ２以上、該インサートのｇとｔとＰからなる断面積Ｂが１４ｍｍ２以上であり、断面積の比Ｂ／Ａが１．３以上であることを特徴とする刃先交換式回転工具である。上記構成を採用することにより、切り屑の形態や排出性を改善し、等高線加工などにおける高能率加工時の刃先の欠損等のトラブルを回避することができる。 The present invention relates to a blade-tip-replaceable rotary tool in which an insert is attachable / detachable, and the blade-replaceable rotary tool has a diameter of 35 mm or less and is composed of three or more blades, and the insert has a substantially parallel 4 having a central mounting hole. Two sides on the long side of the substantially parallelogram flat plate are constraining surfaces with the tool body, and two sides on the short side are main cutting edge ridge lines having a substantially straight portion, When the distance between the two sides on the long side is w, the distance between the other two sides on the short side is g, the thickness of the insert is t, and the diameter of the center mounting hole is P, The cross-sectional area A consisting of w, t and P is 5 mm 2 or more, the cross-sectional area B consisting of g, t and P of the insert is 14 mm 2 or more, and the ratio B / A of the cross-sectional areas is 1.3 or more. This is a blade-exchangeable rotary tool characterized by the following. By adopting the above configuration, it is possible to improve the shape and discharge of chips and avoid troubles such as chipping of the cutting edge during high-efficiency machining in contour machining and the like.
本願発明の切削工具は、切り屑の形態や排出性を改善し、等高線加工などにおける高能率加工時の刃先の欠損等のトラブルを回避することができた。 The cutting tool of the present invention has improved the shape and discharge of chips, and has been able to avoid troubles such as chipping of the cutting edge during high-efficiency machining in contour machining and the like.
切削工具の小径化、多刃化の実現には、バックメタル部の強度を確保するため、インサートの厚さｔを薄くすることになる。そこで、ｔ値ｍｍは１．５≦ｔ≦３．５が好適であり、より好ましくは２．５≦ｔ≦３．２である。同一工具径の場合、小さな寸法のインサートであって、特に厚さ方向に薄いインサートを用いることになる。これは、工具本体のインサートを保持するバックメタル部の強度を確保するためと、切り屑の排出性を確保するためである。
本願発明は、Ｄ値が３５ｍｍ以下の小径の工具を対象としたものである。従ってＤ値が３２ｍｍを超えて大きい場合は、本願発明のインサートが小さいことによる強度不足から破損しやすくなる。しかし、工具本体のインサートを保持するバックメタル部の強度を確保する必要から、Ｄ値は１０ｍｍ以上であることが好ましい。
本願発明の切削工具のインサート数を３枚刃以上とする理由は、２枚刃以下の場合は加工能率が稼げず、工具寿命も刃数が少ないため短寿命になるという不都合があるためである。但し、１０枚を超えて大きい場合は切削加工時の深い部位や、コーナー部でびびり振動を発生しやすいという不都合ある。更に、切り屑の排出性も確保するためには工具本体のチップポケットの形成が必要であり、チップポケットの形成角が小さくなると切り屑排出性は劣化する。従ってこれを回避する点から、インサート数は１０枚以下であることが好ましい。
In order to reduce the diameter of the cutting tool and increase the number of blades, the thickness t of the insert is reduced in order to ensure the strength of the back metal part. Therefore, the t value mm is preferably 1.5 ≦ t ≦ 3.5, and more preferably 2.5 ≦ t ≦ 3.2. In the case of the same tool diameter, an insert having a small size, particularly a thin insert in the thickness direction is used. This is for ensuring the strength of the back metal part that holds the insert of the tool body and for ensuring chip discharge.
The present invention is intended for a small-diameter tool having a D value of 35 mm or less. Therefore, when the D value is larger than 32 mm, the insert of the present invention is easily damaged due to insufficient strength due to the small size. However, since it is necessary to secure the strength of the back metal part that holds the insert of the tool body, the D value is preferably 10 mm or more.
The reason why the number of inserts of the cutting tool of the present invention is 3 blades or more is that when the number of blades is 2 blades or less, the machining efficiency cannot be achieved, and the tool life is short because the number of blades is small. . However, if it is larger than 10 sheets, there is an inconvenience that chatter vibration is likely to occur at a deep part during cutting or at a corner part. Furthermore, in order to ensure chip discharge, it is necessary to form a chip pocket on the tool body, and chip discharge performance deteriorates as the chip pocket forming angle decreases. Therefore, in order to avoid this, the number of inserts is preferably 10 or less.
インサートの小型化は、図１、図２より、インサート２は、略平行四辺形平板状で、厚さを可能な限り薄くし、長辺側５を工具本体との拘束面とし、短辺側６を主切れ刃とした。インサートの小型化は、図３に示す、図２のＡ−Ａ断面の断面積Ａと、図４に示す図２のＢ−Ｂ断面の断面積Ｂと、両断面積の比であるＢ／Ａを特定することにより、縦に長い略平行四辺形平板状とし、短辺側６と中央取付穴までの距離及び断面積を充分に備え、高能率加工時の負荷に耐えうる強度を持たせた。インサートの長辺側の２辺５の距離をｗ、インサートの厚さｔ、該中央取り付け穴の円直径をＰとした時、インサート中央取り付け穴の円の中心を通り、長辺側の辺５に垂直な線ａ−ａにおける断面であって、断面積Ａは５ｍｍ２以上である。図４の斜線部は、ｇとｔとＰからなる断面積Ｂであることを示す。インサートの短辺側の２辺６の距離をｇとした時、図３の断面と直交する方向で、インサート中央取り付け穴の円の中心を通り、線ｂ−ｂにおける断面であって、断面積Ｂは１４ｍｍ２以上である。
Ａが５ｍｍ２未満ではインサートを工具本体に固定するのに十分な大きさのネジを貫通させるためのピン穴径が確保できず、ネジが弛んで損傷してしまうため、Ａは５ｍｍ２以上である。Ｂが１４ｍｍ２未満では彫り込み加工においてインサートが破損する可能性があるため、インサート自体の強度を確保するために、Ｂは１４ｍｍ２以上である。Ｂ／Ａが１．３未満の範囲では、上記インサートのｔ値範囲、１．５≦ｔ≦３．５においてピン穴から主切れ刃まで間隔を十分にとることができない。そのため、インサート強度が低下してしまい、高送り切削加工に耐えられる十分な強度を確保できない問題がある。そこで、断面積の比はＢ／Ａ≧１．３と規定する。
1 and 2, the insert 2 has a substantially parallelogram flat plate shape, the thickness is made as thin as possible, the long side 5 is a constraining surface with the tool body, and the short side 6 was the main cutting edge. The miniaturization of the insert is shown in FIG. 3 in which the cross-sectional area A of the AA cross section of FIG. 2, the cross-sectional area B of the BB cross section of FIG. 2 shown in FIG. By specifying this, it was made into a substantially parallelogram flat plate shape that was long in the longitudinal direction, and had sufficient distance and cross-sectional area between the short side 6 and the central mounting hole, and had the strength to withstand the load during high-efficiency machining. . When the distance between the two sides 5 on the long side of the insert is w, the thickness t of the insert, and the circle diameter of the center mounting hole is P, the side 5 on the long side passes through the center of the circle of the center mounting hole of the insert. And the cross-sectional area A is 5 mm 2 or more. The hatched portion in FIG. 4 indicates a cross-sectional area B composed of g, t, and P. When the distance between the two sides 6 on the short side of the insert is g, it is a cross section taken along the line bb through the center of the circle of the insert center mounting hole in the direction orthogonal to the cross section of FIG. B is 14 mm 2 or more.
By A can not be secured pin hole diameter for passing a sufficient size of the screw to secure the insert to the tool body is less than 5 mm 2, since being damaged by screws loosened, A is 5 mm 2 or more is there. If B is less than 14 mm 2 , the insert may be damaged in the engraving process. Therefore, in order to ensure the strength of the insert itself, B is 14 mm 2 or more. In the range where B / A is less than 1.3, it is not possible to obtain a sufficient interval from the pin hole to the main cutting edge in the t value range of the insert, 1.5 ≦ t ≦ 3.5. Therefore, there is a problem that the insert strength is lowered and a sufficient strength that can withstand high feed cutting cannot be secured. Therefore, the ratio of the cross-sectional area is defined as B / A ≧ 1.3.
図５より、切れ刃の最下点９から外周側に向かう直線部長さがＦｍｍを、０．５≦Ｆ≦８の範囲とすることにより、特に高硬度の被削材を加工する際に、切り屑の排出性が改善される効果があるため、好ましい。これは、切り屑に適度な厚みを持たせてムシレの無い切り屑を生成させるためである。切れ刃の最下点９から外周側に向かう直線部長さがＦの切り込み角κを、５度以上、２０度以下とする。κが５度未満の場合、高硬度な被削材、例えばＨＲＣ４０以上では切れ刃部分に被削材の溶着が発生し易く、工具は短寿命となり好ましくない。κが２０度を超えて大きいの場合、切れ刃の欠損を招きやすくなる傾向となるため好ましくない。切れ刃長さを適切な範囲とすることにより、切削抵抗の増大によるビビリ振動の発生や、これに起因するインサートの破損を回避することができる。インサートのｗｍｍは、５≦ｗ≦１１であることが好ましい。ｗが５ｍｍ未満の場合は、固定するネジ径を小さくしなければならない為、ネジ自体の強度不足によりネジが破損しやすいという不都合があり、一方、１１ｍｍを超えて大きい場合は回転工具として刃数を増やせないという不都合があるので、ｗは５ｍｍ以上、１１ｍｍ以下とすることが好ましい。工具本体へのインサートの固定方法は、工具のインサート座に設けたねじ穴と、インサートに設けたピン穴とを合わせ、固定ねじを挿通させ締め付けて取り付けることによる第１の方法と、クランプ駒を用いてインサートのすくい面を押圧することによる第２の方法とを併用することが好ましい。この様に、独立した２つの固定方法を併用することにより、インサート切れ刃の剛性を向上させることが可能となり、特に、高送り加工において、切れ刃のビビリ振動を抑制するために有効な方法である。更に、インサート座は周方向に不等間隔に形成された場合、被削材コーナー部分の加工時において、ビビリ振動による共振を回避することに好都合である。以下、本願発明を実施例に基づいて説明する。 From FIG. 5, when the length of the straight portion from the lowest point 9 of the cutting edge toward the outer peripheral side is Fmm, in the range of 0.5 ≦ F ≦ 8, particularly when processing a work material with high hardness, This is preferable because there is an effect of improving chip discharge. This is because the chips are given an appropriate thickness to generate chips without mussels. The cut angle κ having a straight portion length F from the lowest point 9 of the cutting edge toward the outer peripheral side is set to 5 degrees or more and 20 degrees or less. When κ is less than 5 degrees, a highly hard work material, for example, HRC 40 or more, is liable to cause welding of the work material at the cutting edge portion, and the tool has a short life, which is not preferable. When κ is larger than 20 degrees, it is not preferable because the cutting edge tends to be damaged. By setting the cutting edge length to an appropriate range, occurrence of chatter vibration due to an increase in cutting resistance and damage to the insert due to this can be avoided. The wmm of the insert is preferably 5 ≦ w ≦ 11. If w is less than 5 mm, the screw diameter to be fixed must be reduced, so that there is a disadvantage that the screw is easily damaged due to insufficient strength of the screw itself. W is preferably 5 mm or more and 11 mm or less. The method for fixing the insert to the tool body is the first method by aligning the screw hole provided in the insert seat of the tool and the pin hole provided in the insert, inserting the fixing screw and tightening, and the clamp piece. It is preferable to use together with the 2nd method by using and pressing the rake face of an insert. In this way, by using two independent fixing methods in combination, it becomes possible to improve the rigidity of the insert cutting edge. In particular, it is an effective method for suppressing chatter vibration of the cutting edge in high feed machining. is there. Furthermore, when the insert seats are formed at unequal intervals in the circumferential direction, it is advantageous to avoid resonance due to chatter vibration during machining of the workpiece corner portion. Hereinafter, the present invention will be described based on examples.
（実施例１）
本発明例、比較例、従来例のインサート及び切削工具を作成し、これらを切削テストによって評価した結果を表１に示す。
Example 1
Table 1 shows the results of making the inserts and cutting tools of the present invention example, comparative example, and conventional example, and evaluating them by a cutting test.
表１より、本発明例１から５は、インサート断面積の比Ｂ／Ａが１．３以上の範囲にあり、略直線部を有する主切れ刃稜線部を有するインサートである。比較例６、８、従来例１０、１１は、Ｂ／Ａ値が１．３以下のインサートである。従来例１０、１１の主切刃形状は直線状ではなくＲ形状であり、夫々のインサートの主切刃Ｒ半径は、８ｍｍ、１０ｍｍとした。比較例７、９は、主切刃形状にＲ形状を採用しており、比較例７の主切刃の半径Ｒは８ｍｍであり、比較例９の主切刃のＲ半径は１０ｍｍとした。表１に示した各種インサートを作製し、これらを切削テストによって評価した。表１に示した切削工具は半径方向すくい角Ｒｒが−６度、軸方向すくい角Ａｒが９度として作製した。各切削工具のインサートの寸法及び固定方法を表１に併記した。評価方法は、切削距離が１６０ｍに達した時点での切刃の状態を観察した。切削評価はインサートの強度を検討するため、工具本体に取り付けるインサート数は１個とした。切削諸元１を下記に示す。
切削諸元１
切削方法：彫り込み加工
被削材：Ｓ５０Ｃ、硬さ、ＨＢ２２０
切り込み深さａｐ：１．０ｍｍ
切り込み幅ａｅ：１５ｍｍ
切削速度Ｖｃ：１８０ｍ／ｍｉｎ
一刃当りの送量ｆｚ：１．０ｍｍ／ｔｏｏｔｈ
切削油：なし、エアーブローによる乾式切削
突き出し量：７５ｍｍ
From Table 1, Examples 1 to 5 of the present invention are inserts having a main cutting edge ridge line portion having a substantially straight portion, with the insert cross-sectional area ratio B / A being in the range of 1.3 or more. Comparative Examples 6 and 8 and Conventional Examples 10 and 11 are inserts having a B / A value of 1.3 or less. The main cutting edge shapes of the conventional examples 10 and 11 are not linear but R-shaped, and the main cutting edge R radius of each insert is 8 mm and 10 mm. In Comparative Examples 7 and 9, an R shape is adopted as the main cutting edge shape. The radius R of the main cutting edge of Comparative Example 7 is 8 mm, and the R radius of the main cutting edge of Comparative Example 9 is 10 mm. Various inserts shown in Table 1 were prepared and evaluated by cutting tests. The cutting tools shown in Table 1 were manufactured with a radial rake angle Rr of −6 degrees and an axial rake angle Ar of 9 degrees. Table 1 shows the dimensions of the insert of each cutting tool and the fixing method. The evaluation method observed the state of the cutting edge when the cutting distance reached 160 m. In the cutting evaluation, in order to examine the strength of the insert, the number of inserts attached to the tool body was set to one. The cutting specification 1 is shown below.
Cutting specifications 1
Cutting method: Engraving Work material: S50C, hardness, HB220
Cutting depth ap: 1.0 mm
Cutting width ae: 15 mm
Cutting speed Vc: 180 m / min
Feed per tooth fz: 1.0 mm / tooth
Cutting oil: None, dry cutting by air blow Protrusion: 75mm
本発明例１から５、比較例７、９のインサートについて、切削距離１６０ｍに達した時点での切れ刃の状態を観察した。その結果、切れ刃に逃げ面摩耗が発生し、すくい面にはクレーター摩耗が確認できたが、チッピングやヒートクラックからのインサート破損、溶着等の異常は見られなかった。更に、本発明例２、４、５、比較例９は、工具本体へのインサートの固定方法において、固定ねじとクランプ駒とを併用することより、インサート切れ刃の剛性を向上させ、切れ刃のビビリ振動を抑制するために有効であった。比較例６、８、従来例１０、１１は切削距離が１６０ｍに達する前にインサートが破損し、途中で切削テストを中断した。本発明例のインサートは強度が高く、ヒートクラックによる割れ発生を防止でき、信頼性の高い加工を行うことができるとともに、これを刃先交換式切削工具に装着して切削能率を高めることができることを確認できた。本発明例３、４、５はＢ／Ａ値が１．３以上であり、κ値を変化させた。本発明例３、４の切削距離１６０ｍまで切削したときの刃先摩耗状態を観察したところ、逃げ面、すくい面に摩耗が確認できたが、チッピングやヒートクラックからのインサート破損等の異常は見られなかった。しかし、本発明例５のκ値が２０度の場合、切削距離１６０ｍ地点での摩耗状態を観察したところ、クレーター摩耗がやや大きくなっていた。これは、κ値が２０度と大きいため、主切刃長さが短くなり、幾何学的関係から切屑厚みが増加したことが原因と考えられる。切屑厚みが増加し、すくい面に発生する応力が増大することで、局所的に摩耗が促進したと考えられる。そのため、κ値を必要以上に大きくすることは工具寿命に悪影響を与えることを確認できた。以上のことより、インサート断面積の比Ｂ／Ａを適切に設定することで、インサート強度を向上させ、特に等高線加工や彫り込み加工において、インサート欠損を防止できることを確認できた。 Regarding the inserts of Invention Examples 1 to 5 and Comparative Examples 7 and 9, the state of the cutting edge when the cutting distance reached 160 m was observed. As a result, flank wear occurred on the cutting edge and crater wear was confirmed on the rake face, but no abnormalities such as insert breakage and welding due to chipping and heat cracks were observed. Furthermore, the present invention examples 2, 4, 5 and comparative example 9 improve the rigidity of the insert cutting edge by using the fixing screw and the clamp piece in combination in the method of fixing the insert to the tool body. It was effective in suppressing chatter vibration. In Comparative Examples 6 and 8 and Conventional Examples 10 and 11, the insert was damaged before the cutting distance reached 160 m, and the cutting test was interrupted. The insert of the present invention has high strength, can prevent cracking due to heat cracks, can perform highly reliable processing, and can be mounted on a cutting edge exchangeable cutting tool to increase cutting efficiency. It could be confirmed. In Invention Examples 3, 4, and 5, the B / A value was 1.3 or more, and the κ value was changed. When observing the cutting edge wear state when cutting to a cutting distance of 160 m in Examples 3 and 4 of the present invention, wear was confirmed on the flank and rake face, but abnormalities such as insert breakage due to chipping and heat cracks were seen. There wasn't. However, when the κ value of Invention Example 5 was 20 degrees, the wear state at a cutting distance of 160 m was observed, and crater wear was slightly increased. This is considered to be because the main cutting edge length is shortened because the κ value is as large as 20 degrees, and the chip thickness is increased due to the geometric relationship. It is considered that wear was promoted locally by increasing the thickness of the chip and increasing the stress generated on the rake face. Therefore, it was confirmed that increasing the κ value more than necessary would adversely affect the tool life. From the above, it was confirmed that by appropriately setting the insert cross-sectional area ratio B / A, the insert strength can be improved, and in particular, in the contour line processing and the engraving process, it is possible to prevent the insert chipping.
（実施例２）
実施例１と同じ工具を用いて、インサートを仕様通り装着し、切削諸元２により切削試験を行った。評価方法は、切削長３００ｍｍまで肩削り加工した時、初期の切り屑の形態及び初期の切れ刃の損傷状態を、夫々のインサートについて観察して評価した。その結果を表２に併記する。
切削諸元２
切削方法：平面肩削り加工
被削材：ＳＫＤ６１、硬さＨＲＣ４５
切り込み深さａｐ：１．０ｍｍ
切り込み幅ａｅ：１５ｍｍ
切削速度Ｖｃ：６０ｍ／ｍｉｎ
一刃当りの送量ｆｚ：０．８ｍｍ／ｔｏｏｔｈ
切削油：なし、エアーブローによる乾式切削
突き出し量：７５ｍｍ
(Example 2)
Using the same tool as in Example 1, the insert was mounted as specified, and a cutting test was performed with the cutting specifications 2. In the evaluation method, when shoulder cutting was performed to a cutting length of 300 mm, the shape of the initial chip and the damaged state of the initial cutting edge were observed and evaluated for each insert. The results are also shown in Table 2.
Cutting specifications 2
Cutting method: flat shoulder machining Work material: SKD61, hardness HRC45
Cutting depth ap: 1.0 mm
Cutting width ae: 15 mm
Cutting speed Vc: 60 m / min
Feed per tooth fz: 0.8 mm / tooth
Cutting oil: None, dry cutting by air blow Protrusion: 75mm
表２より、本発明例１から５のインサートを使用した時の切屑形態およびインサート損傷状態を観察したところ、ムシレの無いきれいな切屑であり、また損傷状態は、何れも被削材の溶着の発生が無く、コーティング剥離も発生しておらず、良好な結果となった。また切削初期の評価であれば、比較例６、８についても同様にムシレの無い切屑であり、損傷状態も良好であった。これら本発明例１から５、比較例６、８は、主切刃形状が直線形状であり、κ値が５≦κ≦２０の範囲の切削工具であった。本発明例２におけるムシレの無い良好な切屑形状の１例を図６に示した。比較例７、９、従来例１０、１１の切削工具は、主切刃にＲ形状を採用しているインサートである。これらの主切刃がＲ形状であるインサートを用いて切削テストを行った結果、切屑稜線部分にはささくれ状のムシレが多数発生しており、また刃先損傷状態を観察したところ、切刃稜線の一部のコーティングが剥離し、溶着も見られた。これは、主切刃にＲ形状を採用しているため、工具先端部分において、切屑厚さが薄くなり、擦るような状態であったため、切屑の流れが不安定となっていることが原因であると考えられる。従来例１１における切屑稜線部分にささくれ状のムシレが多数発生している切屑形状の１例を図７に示す。
本発明例３、４、５のインサートはκ値を変化させた切削工具である。本発明例３、４はκ値が５度であり、切削テストを行った結果、切屑状態は切屑稜線部分にささくれ状のムシレが発生する直前の限界状態であった。これは、主切刃に直線形状を採用しても、κ値が小さい場合にはＲ形状の主切刃と同様に、切屑厚さが薄くなることが原因だと考えられる。また、ＨＲＣ４０以上の高硬度な被削材であっても、切れ刃部分の耐溶着性改善に有効であることが確認できた。本発明例５のインサートはκ値を２０度とした場合、切屑状態はムシレが発生しておらず、良好な切屑であった。しかし、刃先の損傷状態を観察したところ、境界部分に微小なチッピングの初期状態が見られた。これは、κ値を大きく取ったことで発生する切屑厚みが大きくなったために発生したと考えられる。κが２０度を超えて大きいの場合、切れ刃の欠損を招きやすくなる傾向となるため好ましくない。
これより、ＨＲＣ４０を超えるような高硬度材加工においては、κ値が９度前後、好ましくは８〜１３度の直線状切れ刃を設ける事で、切り屑にある程度の厚みを持たせてムシレの無い切り屑を生成させ、切り屑の流れをスムーズにしてやる事により耐溶着性を改善し、更に寿命をアップさせる事が可能であることを確認できた。
From Table 2, when the chip form and insert damage state when using the inserts of Examples 1 to 5 of the present invention were observed, it was clean chips without musiness, and the damage state was occurrence of welding of the work material. No coating peeling occurred and good results were obtained. Further, in the case of evaluation at the initial stage of cutting, Comparative Examples 6 and 8 were similarly swarf-free chips, and the damage state was good. In these inventive examples 1 to 5 and comparative examples 6 and 8, the main cutting edge shape was a linear shape, and the cutting tool had a κ value in the range of 5 ≦ κ ≦ 20. FIG. 6 shows an example of a good chip shape with no musiness in Example 2 of the present invention. The cutting tools of Comparative Examples 7 and 9 and Conventional Examples 10 and 11 are inserts that adopt an R shape for the main cutting edge. As a result of cutting test using inserts whose main cutting edges are R-shaped, many scissors-shaped lashes are generated in the chip ridge part, and when the cutting edge damage state was observed, Some coatings were peeled off and welding was observed. This is because the main cutting edge has an R shape, so that the chip thickness is thin and rubs at the tip of the tool, and the chip flow is unstable. It is believed that there is. FIG. 7 shows an example of a chip shape in which a number of whisker-shaped mussels are generated in the chip ridge line portion in the conventional example 11.
The inserts of Examples 3, 4, and 5 of the present invention are cutting tools with varying κ values. In Examples 3 and 4 of the present invention, the κ value was 5 degrees, and as a result of performing a cutting test, the chip state was a limit state immediately before the occurrence of a whisker-shaped lash on the chip ridge line portion. Even if a linear shape is adopted for the main cutting edge, it is considered that when the κ value is small, the chip thickness is reduced as in the case of the R-shaped main cutting edge. In addition, it was confirmed that even a high-hardness work material of HRC 40 or higher is effective in improving the welding resistance of the cutting edge portion. When the κ value was set to 20 degrees, the insert of Example 5 of the present invention was a good chip with no mess. However, when the damage state of the blade edge was observed, a minute initial state of chipping was observed at the boundary portion. This is considered to have occurred because the chip thickness generated by increasing the κ value was increased. When κ is larger than 20 degrees, it is not preferable because the cutting edge tends to be damaged.
From this, in high-hardness material processing exceeding HRC40, by providing a linear cutting edge with a κ value of around 9 degrees, preferably 8 to 13 degrees, the chips are given a certain thickness to make the It was confirmed that it was possible to improve the welding resistance and to increase the service life by generating no chip and smoothing the chip flow.
１：本願発明の切削工具
２：インサート
３：本願発明の切削工具本体
４：インサート中央取り付け穴の円中心
５：工具本体との拘束面
６：切れ刃稜線
７：主切刃
８：内周切刃
９：工具切れ刃の最下点
１０：コーナー刃
Ａ：断面積
Ｂ：断面積
ｗ：対称の位置にある２辺の距離インサート幅
ｇ：他の対称の位置にある２辺の距離インサート高さ
ｔ：インサート厚さ
κ：主切刃の切り込み角
Ｄ：工具直径
1: Cutting tool of the present invention 2: Insert 3: Cutting tool body of the present invention 4: Circle center of insert center mounting hole 5: Constraining surface with the tool body 6: Cutting edge ridge 7: Main cutting edge 8: Inner cutting Blade 9: Bottom point 10 of the tool cutting edge 10: Corner blade A: Cross-sectional area B: Cross-sectional area w: Distance between two sides at a symmetrical position Insert width g: Distance between two sides at another symmetrical position Insert height T: Insert thickness κ: Cutting angle of main cutting edge D: Tool diameter
Claims (2)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005174434A JP4730817B2 (en) | 2005-06-15 | 2005-06-15 | Blade-replaceable rotary tool |
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| JP2006346788A true JP2006346788A (en) | 2006-12-28 |
| JP4730817B2 JP4730817B2 (en) | 2011-07-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010515589A (en) * | 2007-01-11 | 2010-05-13 | イスカーリミテッド | Cutting tools and cutting inserts |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000005921A (en) * | 1998-06-18 | 2000-01-11 | Hitachi Tool Engineering Ltd | High-feed throwaway type rotating tool and throwaway tip |
| JP2000141123A (en) * | 1998-11-09 | 2000-05-23 | Toyota Motor Corp | Throwaway tip, rotary cutting tool and method for forming die |
| JP2005118965A (en) * | 2003-10-20 | 2005-05-12 | Hitachi Tool Engineering Ltd | Insert and edge replaceable rotary tool |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000005921A (en) * | 1998-06-18 | 2000-01-11 | Hitachi Tool Engineering Ltd | High-feed throwaway type rotating tool and throwaway tip |
| JP2000141123A (en) * | 1998-11-09 | 2000-05-23 | Toyota Motor Corp | Throwaway tip, rotary cutting tool and method for forming die |
| JP2005118965A (en) * | 2003-10-20 | 2005-05-12 | Hitachi Tool Engineering Ltd | Insert and edge replaceable rotary tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010515589A (en) * | 2007-01-11 | 2010-05-13 | イスカーリミテッド | Cutting tools and cutting inserts |
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