JP2007268657A

JP2007268657A - Drilling tool

Info

Publication number: JP2007268657A
Application number: JP2006097351A
Authority: JP
Inventors: Takashi Uejima; 隆司上島
Original assignee: Hitachi Tool Engineering Ltd
Current assignee: Moldino Tool Engineering Ltd
Priority date: 2006-03-31
Filing date: 2006-03-31
Publication date: 2007-10-18
Anticipated expiration: 2026-03-31
Also published as: JP4756697B2

Abstract

<P>PROBLEM TO BE SOLVED: To decrease or prevent the generation of a back burr caused in penetration, and also to prevent a decrease in burr-less effect regardless of abrasion caused by a continuous use. <P>SOLUTION: In this drilling tool for machining a through hole, the width of the top of a deburring blade is gradually decreased as it goes from the knife edge side to the base end side extending from the vicinity of the outer peripheral side end of the tip cutting blade to the leading edge so that the number of deburring blades intermittently provided in the axial direction ranges from 5 to 20, the width of the top of the deburring blade of the knife edge side tip of the intermittent deburring blades ranges from 5.0% to 25.0% of the drilling tool diameter, and the width of the top of the deburring blade at the rear end on the base end side ranges from 0.5% to 3.0% of the drilling tool diameter. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本願発明は、穴開け工具での穴加工において貫通時に発生する加工裏面のバリを、穴加工と同時にバリを切削する事で、加工裏面にバリを減少又は発生させないバリレスの穴開け工具に関する。 The present invention relates to a burr-less drilling tool that does not reduce or generate burrs on the machining back surface by cutting burrs on the machining back surface that occur at the time of drilling in drilling with a drilling tool.

穴開け工具で貫通孔を加工をすると出口側にバリ（以下、裏バリと称する。）が発生し、バリを除去しないと組み立て部品の場合、組み付けた際に加工面が密着しないため、組み立てが出来なかったり、寸法精度が維持できない。金属及び非鉄金属の穴明け加工時の裏バリを減少又は前記組立て等に支障のない程度に発生させない方法として、特許文献１は、穴開け工具切れ刃外周コーナをＲ形状或いはテーパ形状にする事で、バリのでる切刃外周コーナの切刃角度を穴開け工具軸心方向に近づけ、切込み厚さを小さくして徐々に切削し、バリの発生を抑制している。特許文献２は、バリレスの加工方法として、通常の穴開け工具を用いて、穴開け工具の切刃外周コーナ部が加工物裏面より０．００５×穴開け工具径以上０．１５×穴開け工具径以下の深さまで穴加工し、二次切削として、１回転の送りを穴開け工具径×０．２倍以上、穴開け工具径×１．４倍以下ので穴開け工具の切刃外周コーナ部がバリの高さを充分に越える位置まで貫通させ、穴開け工具外周マージン部でバリを引き上げながら剪断し、二次切削の貫通時に押し出された２ヶ所のバリを完全に除去する加工方法が記載されている。
特開２０００−２６３３０６号公報特開２００３−３００１０８号公報 When a through-hole is machined with a drilling tool, burrs (hereinafter referred to as back burrs) are generated on the outlet side. If the burrs are not removed, the assembled parts will not adhere to each other when assembled. It cannot be done or the dimensional accuracy cannot be maintained. As a method of reducing back burr at the time of drilling metal and non-ferrous metal or not causing the above-described assembly or the like to be hindered, Patent Document 1 discloses that an outer peripheral corner of a drilling tool is formed into an R shape or a tapered shape. Thus, the cutting edge angle of the cutting edge outer peripheral corner where the burr comes close is made closer to the drilling tool axial direction, the cutting thickness is reduced, and cutting is performed gradually to suppress the generation of burrs. Patent Document 2 discloses that, as a burr-less machining method, an ordinary drilling tool is used, and the outer peripheral corner portion of the drilling tool is 0.005 × drilling tool diameter or more 0.15 × drilling tool from the back of the workpiece. Drilling to a depth of less than the diameter, as secondary cutting, the feed of one rotation is drilling tool diameter × 0.2 times or more, drilling tool diameter × 1.4 times or less, the outer peripheral corner of the drilling tool Describes a machining method that completely penetrates the burr that was pushed out during the secondary cutting, by penetrating to a position that sufficiently exceeds the height of the burr, shearing while pulling up the burr at the outer periphery margin of the drilling tool Has been.
JP 2000-263306 A JP 2003-300108 A

本願発明は、穴開け工具での穴加工において、貫通時に発生する裏バリを、減少又は発生させないようにすることを課題とした。次に、バリレスの穴開け工具は、使用初期はその効果が優れるものの、摩耗とともに、バリレスの効果が減少し、バリの発生により寿命となっており、継続使用による摩耗によってもバリレスの効果が減少しないようにする事も課題とした。 This invention made it the subject to reduce or not generate | occur | produce the back burr | flash which generate | occur | produces at the time of penetration in the hole processing with a drilling tool. Next, although the effect of burless drilling tools is excellent at the initial stage of use, the effect of burres decreases with wear, and the life of burrs is reduced due to the occurrence of burrs. It was also an issue to avoid it.

本願発明は、貫通孔を加工する穴開け工具において、該穴開け工具は、先端切れ刃の外周側端部近傍よりリーディングエッジにかけて、軸方向に設けた断続させたバリ除去刃の数が５個以上２０個以下で、該断続させたバリ除去刃の刃先側先端のバリ除去刃の頂部の幅が穴開け工具径の５．０％以上２５．０％以下で基端側後端のバリ除去刃の頂部の幅が穴開け工具径の０．５％以上、３．０％以下で、段階的にバリ除去刃の頂部の幅を刃先側から基端側に向けて小さくしたことを特徴とする穴開け工具である。本願発明を適用することにより、貫通時に発生する裏バリの発生が減少又はなくなり、穴加工後のバリ取り作業が不要となった。 The present invention relates to a drilling tool for machining a through hole, and the drilling tool has five interrupted deburring blades provided in the axial direction from the vicinity of the outer peripheral side end of the cutting edge to the leading edge. If the width of the top part of the burr removal blade at the tip of the interrupted burr removal blade is 5.0% or more and 25.0% or less of the diameter of the drilling tool, the burr removal at the rear end on the proximal side is performed. The width of the top of the blade is 0.5% or more and 3.0% or less of the diameter of the drilling tool, and the top width of the burr removing blade is gradually reduced from the blade tip side to the base end side. This is a drilling tool. By applying the present invention, the occurrence of back burrs that occur during penetration is reduced or eliminated, and deburring work after drilling becomes unnecessary.

本願発明によって、穴開け工具での穴加工においてにおいて貫通時に発生する裏バリが減少又は生じなくなり、加工裏面の状態にとらわれる事なく、バリの発生のない穴開け工具を提供することができた。更に、テーパとの組合わせで断続させたケースでは、バリの除去が行えるとともに、貫通時のバリは、断続させた箇所の次の切れ刃がより摩耗の少ない状態で切削できるため、バリレスの効果が長期間、得られた。 According to the present invention, a back burr generated at the time of penetration in drilling with a drilling tool can be reduced or eliminated, and a drilling tool free from burr can be provided without being constrained by the state of the processed back surface. Furthermore, in the case of intermittent burr in combination with the taper, burr can be removed and the burr at the time of penetration can be cut with less wear at the next cutting edge of the intermittent point, so the effect of burr-less Was obtained for a long time.

一般の穴開け工具で貫通孔を加工すると、穴開け工具は切削送りでワークを押し付けて切削するので、貫通時のバリは先端切れ刃で押し出されて発生するが、押し出された時点では弾性復元力により内側に収縮しようとするが、穴開け工具外径部は連続した円筒状であるため、次第にバリの弾性復元力が消滅し、内側に収縮しようとするのをやめてバリ部は固着し、出口側に出っ張る形となる。本願発明の穴開け工具は、先端切れ刃の外周側端部近傍よりリーディングエッジにかけて断続させたバリ除去刃により、貫通時、先端切れ刃で押し出されて発生したバリ部に穴開け工具外径部が接触する面積並びに時間が小さいので、バリは弾性復元力を失う事がなく、断続させたバリ除去刃の谷部に向かって収縮する事で、バリは前記谷部に噛み込まれた後、バリ除去刃の軸方向の１回転の進み量で穴入り口側に引き上げられ除去される。前記バリ除去刃の刃先側先端のバリ除去刃の頂部の幅が穴開け工具径の５．０％以上２５．０％以下としたのは、該バリ除去刃は穴加工を行切削負荷が大きいので刃の強度ならびに耐摩耗性が要求され、５．０％以下ではチッピングや早期摩耗が発生する、２５．０％以上ではバリ部に接触する面積並びに時間が長くなり、バリの発生を抑制できない。
次に、基端側後端のバリ除去刃の頂部の幅が穴開け工具径の０．５％以上、３．０％以下としたのは、０．５％以下ではチッピングや早期摩耗が発生し、３．０％以上ではバリ部に接触する面積並びに時間が長くなりバリの発生を防止できない。バリ除去刃の数が５個以上２０個以下としたのは、５個以下ではバリ除去刃の数が少なく充分にバリを除去できず、２０箇所を越えると、軸方向に断続させたバリ除去刃の長さが長くなりすぎるため、５〜２０箇所とした。より好ましくは８〜１５箇所である。
更に、段階的にバリ除去刃の頂部の幅を刃先側から基端側に向けて小さくすることで、刃先側のバリ除去刃に耐久性を持たせつつ段階的にバリを除去しながら基端側バリ除去刃で完全にバリの除去を実施する。尚、先端切れ刃の外周側端部近傍は、先端切れ刃とリーディングエッジとの繋ぎ部分に係わる切れ刃を指す。 When a through-hole is machined with a general drilling tool, the drilling tool presses the workpiece with a cutting feed and cuts, so the burr at the time of penetration is generated by being pushed out by the cutting edge of the tip. Although it tries to shrink inward by force, the outer diameter part of the drilling tool is a continuous cylindrical shape, so the elastic restoring force of the burr gradually disappears, and the burr part sticks by stopping trying to shrink inside, It protrudes to the exit side. The drilling tool of the present invention is an outer diameter part of a drilling tool in a burr part generated by being pushed out by a tip cutting edge during penetration by a burr removing blade interrupted from the vicinity of the outer peripheral side end of the tip cutting edge to the leading edge. Since the contact area and time are small, the burr does not lose its elastic restoring force, and by shrinking toward the valley of the intermittent burr removal blade, the burr is bitten into the valley, The burr removal blade is lifted and removed to the hole entrance side by an advance amount of one rotation in the axial direction. The width of the top of the burr removal blade at the tip of the burr removal blade is set to 5.0% or more and 25.0% or less of the drilling tool diameter. Therefore, the strength and wear resistance of the blade are required. Chipping and premature wear occur at 5.0% or less, and the area and time in contact with the burr portion become longer at 25.0% or more, and the generation of burrs cannot be suppressed. .
Next, the width of the top of the burr removal blade at the rear end of the base end is 0.5% or more and 3.0% or less of the diameter of the drilling tool. On the other hand, if it is 3.0% or more, the area and time of contact with the burr portion become long and the generation of burr cannot be prevented. The number of burr removal blades is 5 or more and 20 or less. If the number of burr removal blades is less than 5, the number of burr removal blades is small and burrs cannot be removed sufficiently. Since the length of the blade becomes too long, 5 to 20 locations were used. More preferably, it is 8-15 places.
In addition, by gradually reducing the width of the top of the burr removal blade from the blade edge side toward the proximal end, the base edge is removed while gradually removing burrs while making the burr removal blade on the blade edge side durable. Complete deburring with the side deburring blade. In addition, the outer peripheral side edge vicinity of the front-end | tip cutting edge points out the cutting edge concerning the connection part of a front-end | tip cutting edge and a leading edge.

軸方向に断続させたバリ除去刃は、断続させることにより、その谷部でバリを噛み込み・除去するため、その断続させた状態は、穴開け工具外径部が接触する面積並びに時間を小さくし、耐久性を有することが必要であり、その形状は、概略、三角形状、台形状、鋸刃状の何れかに設けると良い。次に、前記バリ除去刃の谷の深さを穴開け工具径の０．０３以上０．２以下とした理由は、径の０．０３以下では、収縮するバリを充分に谷部に引っ掛ける事がてきず、バリを穴入口方向に引き上げる作用が不充分になり、バリの発生を完全に防止できず、０．２以上では、穴開け工具刃先の強度が低下しチッピングを起こす危険性が高まる。 Since the burr removal blade interrupted in the axial direction bites and removes the burr at the troughs by interrupting, the intermittent state reduces the area and time of contact with the outer diameter part of the drilling tool. However, it is necessary to have durability, and the shape is preferably provided in any one of a rough shape, a triangular shape, a trapezoidal shape, and a saw blade shape. Next, the reason why the depth of the valley of the burr removing blade is set to 0.03 or more and 0.2 or less of the drilling tool diameter is that if the diameter is 0.03 or less, the shrinking burr is sufficiently caught in the valley portion. And the action of pulling up the burr toward the hole entrance becomes insufficient, and the generation of the burr cannot be completely prevented. If it is 0.2 or more, the strength of the drilling tool blade tip is lowered and the risk of causing chipping increases. .

軸方向に断続させたバリ除去刃が、先端切れ刃に隣接する穴開け工具外径部から軸方向後端側に向かって、平行でもバリの発生を防止できるが、穴開け工具は穴加工の際に穴開け工具がブレて穴が拡大する傾向が強いので、穴が拡大する場合には、該軸方向に断続させた切れ刃又はエッジが平行の場合、バリ部を充分に軸方向に断続させた切れ刃の谷部に引っ掛ける事がてきず、バリを穴入口方向に引き上げる作用が不充分になり、バリの発生を完全に防止できない場合があるので、軸方向後端側に向かって、径の大きくなるテーパ状とする事で平行の場合の弊害をなくすことが出来る。テーパを付与することにより、使用初期、継続使用による摩耗によってもバリレスの効果が継続する。テーパは、１／５以上ではテーパの角度が強くなり切削抵抗が増大し、軸方向に断続させたバリ除去刃がチッピングを起こす危険性が高まる。軸方向に断続させたバリ除去刃を軸方向後端側に向かってテーパと平行の組合わせで構成すれば並行部は軸方向に断続させたバリ除去刃の径が一定のため、加工した穴の径が一層安定する。テーパ部長さを穴開け工具径の５倍以下としたのは、５倍以上でも効果は充分に維持されるが、加工する穴深さそのものが深穴となり、穴開け工具製造に際し、無駄な加工を避けるためためである。より好ましくは０．５〜２．０倍である。 The burr removal blade that is interrupted in the axial direction can prevent the occurrence of burrs even if it is parallel from the outer diameter part of the drilling tool adjacent to the tip cutting edge toward the rear end side in the axial direction. When drilling holes, the burrs are sufficiently interrupted in the axial direction when the cutting edges or edges interrupted in the axial direction are parallel. Because it does not get caught in the valley of the cut edge, the action of pulling up the burr in the hole entrance direction becomes insufficient, and it may not be possible to completely prevent the occurrence of burr, so toward the rear end side in the axial direction, By adopting a tapered shape with a large diameter, it is possible to eliminate the adverse effects of parallelism. By providing the taper, the effect of burres continues even in the initial use and wear due to continuous use. When the taper is 1/5 or more, the taper angle increases and the cutting resistance increases, and the risk of chipping by the burr removal blade interrupted in the axial direction increases. If the burr removal blade that is interrupted in the axial direction is configured with a combination parallel to the taper toward the rear end side in the axial direction, the diameter of the burr removal blade that is interrupted in the axial direction is constant. The diameter of is more stable. The taper length is 5 times or less than the diameter of the drilling tool. Even if the taper length is 5 times or more, the effect is sufficiently maintained, but the hole depth to be processed becomes a deep hole. Is to avoid. More preferably, it is 0.5 to 2.0 times.

軸方向に断続させたバリ除去刃の谷部を工具周方向にランド巾の１／４〜４／４の長さ設け、山部を工具周方向に１度〜５度の角度で軸方向後端側に傾斜させた理由は、貫通時、先端切れ刃で押し出されて発生したバリは、断続させたバリ除去刃の谷部に向かって収縮する事で、バリは断続させたバリ除去刃の谷部に噛み込まれ、谷部から刃溝を通過して、工具外へと排出されるため、軸方向後端側に傾斜させている。以下、実施例に基づいて本発明を説明する。 The trough part of the burr removing blade intermittently provided in the axial direction is provided with a length of 1/4 to 4/4 of the land width in the circumferential direction of the tool, and the crest part is axially rearward at an angle of 1 to 5 degrees in the circumferential direction of the tool. The reason for inclining to the end side is that the burr generated by being pushed out by the cutting edge at the time of penetration contracts toward the valley of the interrupted burr removing blade, so that the burr is of the interrupted burr removing blade. Since it is bitten by the valley, passes through the groove from the valley, and is discharged out of the tool, it is inclined toward the rear end side in the axial direction. Hereinafter, the present invention will be described based on examples.

（実施例１）
本発明例１として、図１に示す、ハイス製で穴開け工具径８．０ｍｍ、溝長２４ｍｍ、のドリルを用いて、先端切れ刃２の外周側端部に、軸方向に断続させたバリ除去刃として、台形形状のバリ除去刃を１０箇所、軸方向に１０ｍｍ設け、軸方向の１回転の進み量を２ｍｍ、各バリ除去刃は、図２に示す、山の角度６０°、谷の深さ０．６４ｍｍ、基端側後端のバリ除去刃の頂部の幅が０．１ｍｍ（ドリル径の１．２５％）で刃先側先端のバリ除去刃の頂部の幅０．４ｍｍ（ドリル径の５．０％）、で製作した。その軸方向後端側にはマージン９を設けている。本発明例２、３として、本発明例１と同仕様で、刃先側先端のバリ除去刃の頂部の幅０．８ｍｍ（ドリル径の１０．０％）、２．０ｍｍ（ドリル径の２５．０％）の例も製作した。コーティングはＴｉＡｌＮを被覆した。尚、比較のため、比較例４、５として、本発明例１と同仕様で、刃先側先端のバリ除去刃の頂部の幅０．３ｍｍ（ドリル径の３．７５％）、２．４ｍｍ（ドリル径の３０．０％）の例も製作し試験した。
穴加工は、立型マシニングセンターを用い、厚さ１０ｍｍのＳＳ４００の鉄板を加工材料として、切削条件は、Ｖ＝１２ｍ／ｍｉｎ、水溶性切削油を用いて、貫通孔を、１回転当りの送り量、０．１０ｍｍ／ｒｅｖ、０．２０ｍｍ／ｒｅｖ、０．３０ｍｍ／ｒｅｖと変化させて、各送り量で５穴加工し、この時の裏バリの高さの値（ｍｍ）を測定し、測定値とした。バリの発生状態と切削の状態を○、△、×で表記し表１に記載する。尚、表１中の、バリの発生状態に用いた記号は、○印：５穴加工終了しバリの発生のないもの、△印：５穴加工終了しバリの発生が穴の一部に付着しているもの、×印：５穴加工終了しバリの発生が穴の周縁全面に付着しているもの、を示し、バリ除去刃の状態に用いた記号は、○印：５穴加工終了しバリ除去刃に摩耗やチッピングが観られず継続使用可能な状態のもの、△印：５穴加工終了バリ除去刃に摩耗やチッピングが観られ継続使用不可能な状態のものを示す。 Example 1
As Example 1 of the present invention, a burr formed intermittently in the axial direction at the outer peripheral side end of the tip cutting edge 2 using a drill made of high speed and having a drilling tool diameter of 8.0 mm and a groove length of 24 mm shown in FIG. As removal blades, 10 trapezoidal burr removal blades are provided at 10 mm in the axial direction, the advance amount of one rotation in the axial direction is 2 mm, and each burr removal blade is shown in FIG. Depth of 0.64 mm, the width of the top of the burr removal blade at the rear end on the proximal side is 0.1 mm (1.25% of the drill diameter), and the width of the top of the burr removal blade at the tip of the blade edge is 0.4 mm (drill diameter) Of 5.0%). A margin 9 is provided on the rear end side in the axial direction. As Invention Examples 2 and 3, the same specifications as in Invention Example 1 and the width of the top of the burr removing blade at the tip of the blade tip 0.8 mm (10.0% of the drill diameter), 2.0 mm (25. 0%) was also produced. The coating was coated with TiAlN. For comparison, as Comparative Examples 4 and 5, the width of the top of the deburring blade at the tip of the cutting edge side is 0.3 mm (3.75% of the drill diameter), 2.4 mm (with the same specifications as Example 1 of the present invention) An example of 30.0% of the drill diameter was also fabricated and tested.
Hole machining uses a vertical machining center, SS400 iron plate with a thickness of 10 mm is used as the processing material, cutting conditions are V = 12 m / min, water-soluble cutting oil is used, and through holes are fed per revolution. , 0.10 mm / rev, 0.20 mm / rev, 0.30 mm / rev, and 5 holes are processed at each feed rate, and the back burr height value (mm) at this time is measured and measured. Value. The state of occurrence of burrs and the state of cutting are indicated by ◯, Δ, × and are shown in Table 1. In Table 1, the symbols used for the state of occurrence of burrs are as follows: ○: Finished with 5 holes and no burrs; △: Finished with 5 holes and generated burrs on part of the holes. , X mark: indicates that the drilling of 5 holes has been completed and burr has adhered to the entire periphery of the hole, and the symbol used for the state of the burr removal blade is the mark of ○: 5 holes have been drilled Deburring blade shows no wear or chipping and can be used continuously. Δ mark: 5 hole machining finished. Deburring blade shows wear and chipping and cannot be used continuously.

表１より、本発明例１、２、３は、１回転当り送り量０．１０〜０．３０ｍｍ／ｒｅｖでバリの発生は、０．２ｍｍ以下と少なく、バリ取り作業を要しない状態で、バリ除去刃に摩耗やチッピングが観られず継続使用可能な状態であったが、比較例４は、バリ除去刃に摩耗が観られ継続使用不可能な状態であった、比較例５はバリが発生し、出口側に突出した状態のバリが１．１〜２ｍｍ程度のバリ高さあった。更に、本発明例１、２、３の試験を継続し、２０１穴〜２０５穴の状況を確認したところ、使用初期５穴の状況よりやや悪くなったものの、バリ取り作業は不要のレベルであった。 From Table 1, Examples 1, 2, and 3 of the present invention have a feed amount per rotation of 0.10 to 0.30 mm / rev and the occurrence of burrs is as small as 0.2 mm or less, and does not require deburring work. Although the burr removal blade was not worn or chipped, it could be used continuously, but in Comparative Example 4, the burr removal blade was worn and could not be used continuously. The burr generated and protruded toward the outlet side had a burr height of about 1.1 to 2 mm. Furthermore, when the tests of Invention Examples 1, 2, and 3 were continued and the conditions of 201 to 205 holes were confirmed, the deburring work was at an unnecessary level although it was slightly worse than the initial 5 holes. It was.

（実施例２）
本発明例６、７、８として、本発明例１と同一仕様で、刃先側先端のバリ除去刃の頂部の幅が０．８ｍｍ（ドリル径の１０．０％）、で基端側後端のバリ除去刃の頂部の幅が０．０４ｍｍ（ドリル径の０．５％）、０．１２ｍｍ（ドリル径の１．５％）、０．２４ｍｍ（ドリル径の３．０％）、のものを製作した。尚、比較のため、比較例９、１０として、基端側後端のバリ除去刃の頂部の幅が０．０２ｍｍ（ドリル径の０．２５％）、０．３２ｍｍ（ドリル径の４．０％）の例も製作し切削諸元等は、実施例１と同じで試験した。 (Example 2)
As invention examples 6, 7, and 8, the same specifications as in invention example 1, the width of the top of the burr removal blade at the tip of the blade tip is 0.8 mm (10.0% of the drill diameter), and the rear end on the base end side Burrs with a top width of 0.04mm (0.5% of drill diameter), 0.12mm (1.5% of drill diameter), 0.24mm (3.0% of drill diameter) Was made. For comparison, as Comparative Examples 9 and 10, the width of the top of the burr removal blade at the rear end on the base end side is 0.02 mm (0.25% of the drill diameter), 0.32 mm (4.0 mm of the drill diameter). %) Was also manufactured, and cutting specifications and the like were tested in the same manner as in Example 1.

表２より、本発明例５、６、７は、１回転当り送り量０．１０〜０．３０ｍｍ／ｒｅｖでバリの発生は、０．２ｍｍ以下と少なく、バリ取り作業を要しない状態で、基端側後端のバリ除去刃に摩耗やチッピングが観られず継続使用可能な状態であったが、比較例９は、基端側後端のバリ除去刃に摩耗が観られ継続使用不可能な状態であった、比較例１０はバリが発生し、出口側に突出した状態のバリが１．４〜２ｍｍ程度のバリ高さあった。 From Table 2, Examples 5, 6, and 7 of the present invention have a feed amount per rotation of 0.10 to 0.30 mm / rev and the occurrence of burrs is as small as 0.2 mm or less, and no deburring work is required. The burr removal blade on the base end side rear end was in a state where it could be used continuously without any wear or chipping, but in Comparative Example 9, the burr removal blade on the base end side rear end was worn and could not be used continuously. In Comparative Example 10, the burrs were generated, and the burrs protruding to the outlet side had a burr height of about 1.4 to 2 mm.

（実施例３）
本発明例１１として、本発明例１と同一仕様で、刃先側先端のバリ除去刃の頂部の幅が０．８ｍｍ（ドリル径の１０．０％）、基端側後端のバリ除去刃の頂部の幅が０．０８ｍｍ（ドリル径の１．０％）で、バリ除去刃の数が５箇所、本発明例１２として、同、１０箇所、本発明例１３として、同、２０箇所のものを製作した。尚、比較のため、比較例１４として４箇所の例も製作し切削諸元等は、実施例１と同じで試験した。 (Example 3)
As Example 11 of the present invention, the width of the top part of the burr removing blade at the tip of the cutting edge side is 0.8 mm (10.0% of the drill diameter) with the same specifications as Example 1 of the present invention, and the burr removing blade at the base side rear end The width of the top part is 0.08 mm (1.0% of the drill diameter), the number of burr removing blades is five, the present invention example 12 is the same as the present invention example 13, the present invention example 13 is the same as the 20th thing Was made. For comparison, four examples as Comparative Example 14 were also manufactured, and cutting specifications were tested in the same manner as in Example 1.

表３より、本発明例１１、１２、１３は、１回転当り送り量０．１０〜０．３０ｍｍ／ｒｅｖでバリの発生は、０．２ｍｍ以下と少なく、バリ取り作業を要しない状態で、基端側後端のバリ除去刃に摩耗やチッピングが観られず継続使用可能な状態であったが、比較例１４はバリが発生し、出口側に突出した状態のバリが１．４〜２ｍｍ程度のバリ高さあり、、本発明例１１、１２、１３は、断続させたバリ除去刃の数を増加させることにより、裏バリの除去はより確実に行うことができ、４箇所ではバリ高さが高くなったが、５箇所以上で充分、バリの除去を行うことができた。 From Table 3, Invention Examples 11, 12, and 13 have a burr generation of less than 0.2 mm at a feed amount per rotation of 0.10 to 0.30 mm / rev, and do not require a deburring operation. The burr removal blade on the base end side rear end was in a state where it could be used continuously without any wear or chipping, but in Comparative Example 14, the burr was generated and the burr in a state of protruding to the outlet side was 1.4 to 2 mm. The present invention examples 11, 12, and 13 have a certain burr height. By increasing the number of intermittent burr removing blades, the back burr can be removed more reliably. However, the burrs were sufficiently removed at 5 or more locations.

（実施例４）
本発明例１５、１６、１７として、本発明例１と同一仕様で、軸方向に断続させたバリ除去刃の谷の深さを、ドリル径の０．０３倍（０．２４ｍｍ）、ドリル径の０．１２倍（０．９６ｍｍ）、ドリル径の０．２０倍（１．６０ｍｍ）設けた。切削諸元等は、実施例１と同じで行った。 Example 4
As Invention Examples 15, 16, and 17, the depth of the valley of the burr removal blade interrupted in the axial direction with the same specifications as in Invention Example 1 is 0.03 times the drill diameter (0.24 mm), the drill diameter Of 0.12 (0.96 mm) and 0.20 (1.60 mm) of the drill diameter. Cutting specifications and the like were the same as in Example 1.

表４より、本発明例１５、１６、１７は、谷を深くすることにより、バリの除去を確実に行うことができ、断続させたバリ除去刃の谷部に向かって収縮する事で、バリは断続させたバリ除去刃の谷部に噛み込まれるため、裏バリの高さをより減じることができた。 From Table 4, Examples 15, 16, and 17 of the present invention can surely remove burrs by deepening the valleys, and the burrs are shrunk toward the valleys of the intermittent burr removal blades. Since it is bitten by the valley of the intermittent burr removal blade, the height of the back burr can be further reduced.

（実施例５）
本発明例１８〜２０として、本発明例１と同仕様で、軸方向に断続させたバリ除去刃として、先端切れ刃を含むドリル外径部近傍から軸方向後端側に向かって、テーパ部を１２ｍｍ設け、本発明例１８として、テーパ１／１０、本発明例１９として、テーパ１／５、本発明例２０として、テーパ１／１０を８ｍｍ、その後に平行部を４ｍｍ設けた例を製作した。尚、比較のため、比較例２１として、テーパ１／４のものも製作した。切削諸元等は、実施例１と同じで行った。 (Example 5)
As inventive examples 18-20, the taper part from the vicinity of the drill outer diameter part including the tip cutting edge toward the axial rear end side as the burr removal blade interrupted in the axial direction with the same specifications as the inventive example 1 12 mm, taper 1/10 as the present invention example 18, taper 1/5 as the present invention example 19, taper 1/10 as the present invention example 20, taper 1/10 8 mm, followed by 4 mm parallel part did. For comparison, a comparative example 21 having a taper 1/4 was also manufactured. Cutting specifications and the like were the same as in Example 1.

表５より、本発明例１８〜２０は、テーパと平行部とを組合わせることにより、バリの除去をより確実に行うことができ、特に、本発明例２０のテーパ部と平行部とを組合わせた例では、穴の精度も良く、バリ取りも不要であった。 From Table 5, the inventive examples 18 to 20 can more reliably remove burrs by combining the taper and the parallel part, and in particular, the tapered part and the parallel part of the inventive example 20 are combined. In the combined example, the accuracy of the hole was good and deburring was unnecessary.

図１は、本発明例１の穴開け工具の斜視図を示す。FIG. 1 shows a perspective view of a drilling tool of Example 1 of the present invention. 図２は、図１の要部拡大図を示す。FIG. 2 shows an enlarged view of the main part of FIG.

符号の説明Explanation of symbols

１：ドリル
２：先端切れ刃
３：リーディングエッジ
４：軸方向に断続させたバリ除去刃
５：断続させる部分の長さ
６：バリ除去刃（台形形状）の山の角度
７：谷の深さ
８：バリ除去刃（台形形状）の頂部の幅
９：マージン 1: Drill 2: Cutting edge at leading end 3: Leading edge 4: Deburring blade interrupted in axial direction 5: Length of interrupted portion 6: Angle of peak of deburring blade (trapezoidal shape) 7: Depth of valley 8: Width of top of deburring blade (trapezoidal shape) 9: Margin

Claims

貫通孔を加工する穴開け工具において、該穴開け工具は、先端切れ刃の外周側端部近傍よりリーディングエッジにかけて、軸方向に断続させたバリ除去刃を、５箇所以上２０箇所以下設け、該バリ除去刃の刃先側のバリ除去刃の頂部の幅が穴開け工具径の５．０％以上２５．０％以下で、基端側のバリ除去刃の頂部の幅が穴開け工具径の０．５％以上、３．０％以下で、バリ除去刃の頂部の幅を刃先側から基端側に向けて段階的に小さく設けたことを特徴とする穴開け工具。 In the drilling tool for processing the through-hole, the drilling tool is provided with 5 to 20 burr removing blades that are intermittent in the axial direction from the vicinity of the outer peripheral side end portion of the tip cutting edge to the leading edge, The width of the top of the burr removal blade on the tip side of the burr removal blade is 5.0% or more and 25.0% or less of the drilling tool diameter, and the width of the top of the burr removal blade on the base end side is 0 of the drilling tool diameter. A drilling tool having a width of 5% or more and 3.0% or less, wherein the top width of the burr removing blade is gradually reduced from the blade tip side to the base end side.

請求項１記載の穴開け工具において、該バリ除去刃を三角形状、台形状、鋸刃状の何れかに設けたことを特徴とする穴開け工具。 2. The drilling tool according to claim 1, wherein the burr removing blade is provided in any one of a triangular shape, a trapezoidal shape, and a saw blade shape.

請求項１又は２記載の穴開け工具において、該バリ除去刃の谷の深さを穴開け工具径の０．０３以上０．２以下としたことを特徴とする穴開け工具。 3. The drilling tool according to claim 1, wherein the depth of the valley of the burr removing blade is 0.03 or more and 0.2 or less of the drilling tool diameter.

請求項１乃至３何れかに記載の穴開け工具において、該バリ除去刃は、テーパ１／５以下で、テーパ部長さが穴開け工具径の５倍以下、設けたことを特徴とする穴開け工具。 The drilling tool according to any one of claims 1 to 3, wherein the burr removing blade is provided with a taper of 1/5 or less and a taper portion length of 5 times or less of the diameter of the drilling tool. tool.

請求項１乃至４何れかに記載の穴開け工具において、該バリ除去刃の谷部を、工具周方向に、ランド巾の１／４〜４／４の長さ設けたことを特徴とする穴開け工具。 5. The hole drilling tool according to claim 1, wherein a valley portion of the burr removing blade is provided in the tool circumferential direction by a length of ¼ to 4/4 of a land width. Opening tool.

請求項５記載の穴開け工具において、該バリ除去刃の山部を、工具周方向に、１度〜５度の角度で軸方向後端側に傾斜させたことを特徴とする穴開け工具。 6. The drilling tool according to claim 5, wherein a crest of the burr removing blade is inclined toward the rear end side in the axial direction at an angle of 1 to 5 degrees in the tool circumferential direction.

請求項１乃至６何れかに記載の穴開け工具において、該工具は超硬合金或いはハイス製で、硬質皮膜及び又は潤滑性皮膜を被覆したことを特徴とする穴開け工具。
The drilling tool according to any one of claims 1 to 6, wherein the tool is made of cemented carbide or high-speed steel and is coated with a hard film and / or a lubricious film.