JP3546915B2 - Cross drilling method and drilling tool - Google Patents

Cross drilling method and drilling tool Download PDF

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Publication number
JP3546915B2
JP3546915B2 JP20384097A JP20384097A JP3546915B2 JP 3546915 B2 JP3546915 B2 JP 3546915B2 JP 20384097 A JP20384097 A JP 20384097A JP 20384097 A JP20384097 A JP 20384097A JP 3546915 B2 JP3546915 B2 JP 3546915B2
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hole
tool
drilling
diameter
small
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JPH1133807A (en
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真司 飯野
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Toyota Motor Corp
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Toyota Motor Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B41/12—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for forming working surfaces of cylinders, of bearings, e.g. in heads of driving rods, or of other engine parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2215/00—Details of workpieces
    • B23B2215/20—Crankshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2250/00—Compensating adverse effects during turning, boring or drilling
    • B23B2250/12—Cooling and lubrication

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Drilling Tools (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、交差する二つの穴を工具により切削加工する交差穴加工方法およびその方法の実施に用いる穴加工用工具に関する。
【０００２】
【従来の技術】
例えば、車両用エンジンのクランク軸には、図６および図７に示すように、二つの穴１と２とを交差させた油穴３が形成される。この油穴３を構成する二つの穴のうち、一方の穴（第１の穴）１は、クランク軸５のジャーナル部６を径方向へ貫通して設けられ、他方の穴（第２の穴）２は、クランク軸５のピン部７から前記ジャーナル部６まで貫通して設けられており、油穴３は第１の穴１に対して第２の穴２を所定の傾斜角度で交差させた形状となっている。
【０００３】
ところで、上記した油穴３の加工は、従来一般には、図８に示すように、先ず、工具（ドリル）８をジャーナル部６に対して切り込ませて第１の穴１を加工し（▲１▼）、続いて、他の工具（ドリル）９をピン部７からジャーナル部６へ斜め方向に切り込ませて第２の穴２を加工する（▲２▼）ようにしていた。しかし、このような加工様式によれば、第１の穴１と第２の穴２との交差部にバリ４が発生するのを避けることはできず、そのまま放置したのでは、エンジン使用中にバリ４が脱落して、軸受メタルの焼付きを起すなどの弊害をもたらすことになる。
【０００４】
【発明が解決しようとする課題】
そこで従来は、上記した工具８，９を加工済の穴１，２に再度回転挿入し、あるいは別に用意したワイヤブラシを同穴に回転挿入してバリ４を除去するようにしていた。しかし、このようなバリ取り方法では、バリ４に対する工具やブラシの接触が不十分なため、バリ４の大部分がそのまま、あるいは相手側の穴内に倒れ込んで（図８に符号４ａで示す）残ることが多い上、芯ずれによる２次切削（せん断作用を伴わない）で新たに２次バリが発生することが多く、その後さらに、高圧洗浄や電解による特別のバリ取りを実施しなければならない状況にあった。
【０００５】
なお、例えば特開昭６２−６３００４号公報には、最初に開けた一方の穴に対して他方の穴を交差形成するに際し、１８０度異なる二方向より交互に穴開けを行い、この他方の穴の最初の穴開けで生じたバリを、次の反対側からの穴開けにより除去する方法が提案されているが、この方法でも、同径工具による穴開けの繰返しとなるため、上記した接触不十分によるバリ残りや芯ずれによる２次バリの発生が避けられず、根本的な解決には至らない。
【０００６】
本発明は、上記従来の問題点を解決することを課題としてなされたもので、その目的とするところは、二つの穴の交差部に生じるバリを穴開け工程内で確実に除去できるようにし、もって特別のバリ取り工程を不要とする交差穴加工方法を提供することにある。
【０００７】
【課題を解決するための手段】
上記目的を達成するため、本発明の方法は、先に加工する第１の穴の、少なくとも第２の穴との交差部分を、所定の仕上寸法より小径に形成し、第２の穴を加工した後、前記第１の穴を所定の仕上寸法に仕上加工することを特徴とする。
この方法によれば、第２の穴を加工する際生じるバリは、先に加工した第１の穴の小径部分に発生し、したがって、この小径部分の除去代（取り代）を適当な大きさに設定しておくことで、その後、この小径部分の穴内面を削除すれば、その削除される肉と一緒にバリが除去される。
【０００８】
交差穴としては、第１の穴に対して第２の穴が傾斜して交差形成される場合があり、この場合は、上記第１の穴を仕上加工する際、第２の穴の加工方向に見て、該第２の穴が第１の穴に対して鈍角に交差する側から工具を進入させるようにするのが望ましい。
このようにすることで、第１の穴を仕上加工する際、第２の穴に対して工具が抜ける側の角部が鈍角となって、その角部の切削予定面剛性が大きくなっているので、２次バリの発生も確実に防止される。
【０００９】
本発明の穴加工用工具は、上記第１の穴を仕上加工するためのもので、先端部に、穴の小径部分に嵌入可能なガイド部を設けたことを特徴としている。このように、先端部にガイド部を設けることで、第１の穴の小径部分を仕上加工する際、先に開けた穴に対する工具の芯ずれを防止することができ、穴内面を均等に削除することができて、バリ除去が確実となる。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態を添付図面に基いて説明する。
【００１１】
図１は、本発明にかゝる交差穴加工方法を示したものである。なお、本発明で加工しようとする交差穴は、前出図６、７に示したクランク軸５の油穴３であり、こゝでは、図６、７に示した部分と同一部分には同一符号を付すこととする。この油穴３の加工に際しては、先ず、図１▲１▼に示すように、クランク軸５（図６参照）のジャーナル部６に対し、径の異なる二つの工具（ドリル）８，８′を１８０ 度反対側から切り込ませて、第１の穴１を加工する。この第１の穴１は、工具８により所定の仕上寸法に加工した大径部１ａと、工具８′により仕上寸法より小径に加工した小径部１ｂとからなっている。こゝで、大径部１ａの穴径（仕上径）Ｄと小径穴１ｂの穴径ｄとの差Δ（Δ＝Ｄ−ｄ）は、後に小径穴１ｂを切削する際、確実にせん断作用を生じさせるに足る大きさ（一例として、Δ＝０．８ｍｍ ）に設定されている。
【００１２】
次に、図１▲２▼に示すように、クランク軸５のピン部７（図６参照）からジャーナル部６へ斜め方向に工具（ドリル）９を切り込ませて第２の穴２を加工する。この第２の穴２は、ジャーナル部６側において前記第１の穴１の小径部１ｂに対し、所定の角度で交差して開通し、その開通部（交差部）にはバリ４が発生するようになる。なお、このバリ４は、第２の穴２の加工方向に見て、該第２の穴２が第１の穴１（１ｂ）に対して鋭角に交差する角部Ｃ１ 側に生じる。
【００１３】
その後、図１▲３▼および▲４▼に示すように、別途用意した後述の穴加工用工具（ドリル）１０を先に加工した第１の穴１の小径部１ｂに、大径部１ａと反対側から挿入し、該小径部１ｂを所定の仕上寸法（Ｄ）に仕上加工する。この時、工具１０による除去代δは十分にある（δ＝Δ／２＝０．４ｍｍ ）ので、交差部に存在していたバリ４は、工具１０によって削除される小径部１ｂの穴内面の肉と一緒に除去される。また、工具１０が、第２の穴２に対して抜ける側の角部Ｃ２ は鈍角となっているので、その角部Ｃ２ の切削予定面剛性は十分に大きく、ここに２次バリが発生することはない。しかも、前記角部Ｃ２ と対向する側の角部Ｃ１ は鋭角になっているが、この部分は工具１０が入り込む側のため切削抵抗のベクトルが切削予定面に影響せず、したがってこの鋭角な角部Ｃ１ にも２次バリは発生しない。すなわち、工具１０によってバリ４が削除されるばかりか、２次バリの発生も抑制され、バリのない油穴３が完成するようになる。
【００１４】
こゝで、上記穴加工用工具１０は、図２および図３に示すように、シャンク部１１と、リーディングエッジ１２を有する刃部１３と、刃部１３の先端に連接された、刃部１３より小径のガイド部１４とからなっている。刃部１３の先端であってガイド部１４との接続段差は切れ刃１５として構成され、また刃部１３とガイド部１４とには複数のねじれ溝１６が共通に形成されている。ガイド部１４の周面１４ａは平坦に形成されており、その周面１４ａを含む円筒面の直径は、上記第１の穴１の小径部１ｂの穴径ｄよりわずか小さく設定されている。
【００１５】
このような工具１０を用いることにより、第１の穴１の小径部１ｂを仕上げ加工する際、先ず工具１０の先端のガイド部１４が小径部１ｂに挿入され、工具１０の刃部１３は加工済みの第１の穴１に同心に誘導される。この結果、小径部１ｂの穴内面は切れ刃１５により均等に削除され、バリ４は確実に除去される。
【００１６】
なお、上記実施の形態において、第１の穴１の加工に際して、第２の穴２と交差する部分のみを小径部１ｂとしたが、本発明は、第１の穴１の全長を小径部として形成しても良いものである。この場合は、工具１０を、先に開けた穴（第１の穴）の全長に通して、穴全体を仕上加工する。
【００１７】
【実施例】
実施例１
第１および第２の穴１、２の仕上寸法（穴径）を６ｍｍとし、先に開ける第１の穴１の小径部１ｂの穴径ｄ、すなわち工具１０による除去代δを０から０．５５ｍｍまで種々に変化させて、上記実施の形態で示した手順（図１）で交差穴の加工を行い、交差部に残存するバリの大きさを測定した。
【００１８】
図４は、その結果を示したもので、除去代δが０、すなわち第１の穴１の全長を工具８により最初から仕上寸法Ｄに加工した場合は、第２の穴２の加工で生じたバリ４がそのまま残ってしまうことが分かった。一方、除去代δを設定した場合でも、その除去代δが０．１ｍｍ と著しく小さい場合は、むしろバリが拡大する現象が見られた。これは、除去代が小さいため、工具１０による加工に際してせん断現象が起こらず、新たなバリが発生したためと推定される。また、除去代δを０．２５ｍｍから０．５５ｍｍ範囲に設定した場合は、何れもバリの除去効果が認められるが、除去代δが０．４ｍｍ の場合にバリの残存はほとんど認められず、バリ除去に著しく効果的にあることが分かった。これより、第１の穴１の小径部１ｂの穴径ｄは、除去代δ＝０．４ｍｍ を中心に、小さくてもδ＝０．２５ｍｍ、大きくてもδ＝０．５５ｍｍとなる範囲（０．２５〜０．５５ｍｍ）に設定するのが望ましいといえる。
【００１９】
実施例２
第１および第２の穴１、２の仕上寸法（穴径）を６ｍｍとし、先に開ける第１の穴１の小径部１ｂの穴径ｄを仕上径の−０．８ｍｍ （除去代δ＝０．４ｍｍ ）に設定し、上記したガイド部１４を有する工具１０と、このようなガイド部を有しない汎用の工具とを用いて前記小径部１ｂを仕上加工し、その加工に際して第１の穴１に対する工具の芯ズレ量を測定して、それぞれ統計値（平均値、バラツキ）を求めた。なお、測定数ｎは１０である。
【００２０】
図５は、その結果を示したもので、ガイド部１４を有する工具１０を用いた場合は、該ガイド部を有しない工具を用いた場合に比べて、芯ズレ量の平均値、バラツキ（標準偏差）共に著しく小さくなっている。芯ズレ量が小さいということは、少ない除去代でも小径部１ｂの穴内面を均等に削除できることを意味しており、これにより、例えば除去代δとして上記した理想の値δ＝０．４ｍｍ を設定して、安全かつ確実にバリ除去を行うことができるようになる。
【００２１】
【発明の効果】
以上、説明したように、本発明にかゝる交差穴加工方法によれば、二つの穴の交差部に生じるバリを穴開け工程内で確実に除去できるので、別途、特別のバリ取り工程を設ける必要がなくなり、生産性の向上および製造コストの低減に大きく寄与するものとなる。
また、本発明にかゝる穴加工用工具によれば、先端にガイド部を設けるだけの簡単な構成で芯ズレを大幅に低減することができ、穴内面を均等に削除することが可能になって、上記交差穴加工方法の実施に向けて好適となる。
【図面の簡単な説明】
【図１】本発明にかゝる交差穴加工方法を順を追って示す断面図である。
【図２】本発明にかゝる穴加工用工具の形状を示す正面図である。
【図３】図２のＢ−ＢおよびＣ−Ｃ矢視線に沿う断面図である。
【図４】第１の穴を仕上加工する際の除去代と残存バリの大きさとの関係を示すグラフである。
【図５】第１の穴を仕上加工する際の芯ずれ量に及ぼす工具種類の影響を示すグラフである。
【図６】本発明の加工対象の一つであるクランク軸とこれに加工される交差穴を示す正面図である。
【図７】図６のＡ−Ａ矢視線に沿う断面図である。
【図８】従来の交差穴加工方法を順を追って示す断面図である。
【符号の説明】
１ 第１の穴、 １ａ 大径部、 １ｂ 小径部
２ 第２の穴
３ 油穴（交差穴）
４ バリ
８，８′ 第１の穴加工用工具
９ 第２の穴加工用工具
１０ 第１の穴の小径部加工用工具、 １４ 工具のガイド部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an intersecting hole drilling method for cutting two intersecting holes with a tool and a drilling tool used for carrying out the method.
[0002]
[Prior art]
For example, as shown in FIGS. 6 and 7, an oil hole 3 in which two holes 1 and 2 intersect is formed in a crankshaft of a vehicle engine. One of the two holes constituting the oil hole 3 (first hole) 1 is provided to penetrate through the journal portion 6 of the crankshaft 5 in the radial direction, and the other hole (second hole) is provided. 2) is provided so as to penetrate from the pin portion 7 of the crankshaft 5 to the journal portion 6, and the oil hole 3 intersects the first hole 1 with the second hole 2 at a predetermined inclination angle. Shape.
[0003]
By the way, the above-described processing of the oil hole 3 is generally performed by first cutting a tool (drill) 8 into the journal portion 6 and processing the first hole 1 as shown in FIG. 1)) Then, another tool (drill) 9 is cut obliquely from the pin portion 7 into the journal portion 6 to machine the second hole 2 ((2)). However, according to such a processing mode, generation of burrs 4 at the intersection of the first hole 1 and the second hole 2 cannot be avoided. The burrs 4 fall off, causing adverse effects such as seizure of the bearing metal.
[0004]
[Problems to be solved by the invention]
Therefore, conventionally, the burrs 4 are removed by re-rotatingly inserting the tools 8 and 9 into the machined holes 1 and 2 or by inserting a separately prepared wire brush into the holes. However, in such a deburring method, since the tool or the brush does not sufficiently contact the burr 4, most of the burr 4 remains as it is or falls down into a hole on the other side (indicated by reference numeral 4a in FIG. 8). In many cases, secondary burrs are often generated by secondary cutting (without shearing action) due to misalignment, and special deburring by high-pressure cleaning and electrolysis must be performed thereafter. Was in
[0005]
For example, in Japanese Patent Application Laid-Open No. 62-63004, when one of the first holes is formed so as to intersect with the other hole, holes are alternately formed from two directions different by 180 degrees, and the other hole is formed. A method has been proposed in which the burrs generated in the first drilling of the above are removed by drilling from the next opposite side. However, even with this method, drilling with the same diameter tool is repeated, so that the above-mentioned contact failure is not achieved. The occurrence of secondary burrs due to sufficient burrs or misalignment is inevitable, and does not lead to a fundamental solution.
[0006]
The present invention has been made to solve the above-described conventional problems, and has as its object to ensure that burrs generated at the intersection of two holes can be reliably removed in a drilling process. Accordingly, it is an object of the present invention to provide a cross-hole processing method which does not require a special deburring step.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the method of the present invention comprises forming at least an intersection of the first hole to be machined with the second hole to have a diameter smaller than a predetermined finishing dimension, and machining the second hole. Then, the first hole is finished to a predetermined finish size.
According to this method, burrs generated when the second hole is machined are generated in the small-diameter portion of the previously machined first hole. Then, by removing the inner surface of the hole of the small diameter portion, the burr is removed together with the meat to be removed.
[0008]
As the intersecting hole, there is a case where the second hole is formed obliquely and intersects with the first hole. In this case, when finishing the first hole, the processing direction of the second hole In view of the above, it is desirable to make the tool enter from the side where the second hole intersects the first hole at an obtuse angle.
In this way, when finishing the first hole, the corner on the side from which the tool comes out with respect to the second hole becomes obtuse, and the rigidity of the corner to be cut increases. Therefore, the occurrence of secondary burrs is reliably prevented.
[0009]
The hole drilling tool according to the present invention is for finishing the first hole, and is provided with a guide portion at a tip end thereof which can be fitted into a small diameter portion of the hole. Thus, by providing the guide portion at the tip, when finishing the small-diameter portion of the first hole, it is possible to prevent the tool from being misaligned with the previously drilled hole, and to uniformly delete the inner surface of the hole. And burrs can be reliably removed.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0011]
FIG. 1 shows a cross hole drilling method according to the present invention. The cross hole to be machined in the present invention is the oil hole 3 of the crankshaft 5 shown in FIGS. 6 and 7 described above. In this case, the same portions as those shown in FIGS. A reference numeral will be attached. When machining the oil hole 3, first, as shown in FIG. 1 (1), two tools (drills) 8, 8 'having different diameters are applied to the journal portion 6 of the crankshaft 5 (see FIG. 6). The first hole 1 is machined by making a cut 180 ° from the opposite side. The first hole 1 is composed of a large diameter portion 1a machined to a predetermined finish size by a tool 8 and a small diameter portion 1b machined to a smaller diameter than the finish size by a tool 8 '. Here, the difference Δ (Δ = D−d) between the hole diameter (finished diameter) D of the large-diameter portion 1a and the hole diameter d of the small-diameter hole 1b is determined by a reliable shearing action when the small-diameter hole 1b is cut later. (For example, Δ = 0.8 mm 2).
[0012]
Next, as shown in FIG. 1-2, a tool (drill) 9 is cut obliquely from the pin portion 7 (see FIG. 6) of the crankshaft 5 to the journal portion 6 to form the second hole 2. I do. The second hole 2 crosses the small diameter portion 1b of the first hole 1 at a predetermined angle on the journal portion 6 side and is opened, and burrs 4 are generated at the opening portion (intersection). Become like Incidentally, the burr 4, when viewed in a second machining direction of the hole 2, resulting in the hole 2 of the second corner portion C 1 side intersecting at an acute angle to the first bore 1 (1b).
[0013]
Thereafter, as shown in FIGS. 1 (3) and (4), a large-diameter portion 1a is added to a small-diameter portion 1b of the first hole 1 previously processed by a separately prepared hole drilling tool (drill) 10 described later. The small-diameter portion 1b is inserted from the opposite side and finish-processed to a predetermined finish dimension (D). At this time, since the removal allowance δ by the tool 10 is sufficient (δ = Δ / 2 = 0.4 mm 2), the burr 4 existing at the intersection is removed from the inner surface of the hole of the small diameter portion 1b to be deleted by the tool 10. Removed with meat. Furthermore, the tool 10, the corners C 2 on the side where the exit to the second hole 2 Since obtuse, the preset cutting plane rigidity of the corner portion C 2 is sufficiently large, is here secondary burr It does not occur. Moreover, although the corner portion C 2 and the opposite corner C 1 on the side of is an acute angle, this part vector of cutting forces for the side where the tool 10 enters does not affect the preset cutting plane, therefore the acute angle the secondary burr does not occur in a corner portion C 1. That is, not only the burrs 4 are removed by the tool 10, but also the generation of secondary burrs is suppressed, and the oil holes 3 without burrs are completed.
[0014]
Here, as shown in FIGS. 2 and 3, the drilling tool 10 includes a shank portion 11, a blade portion 13 having a leading edge 12, and a blade portion 13 connected to the tip of the blade portion 13. The guide portion 14 has a smaller diameter. The connection step between the tip of the blade portion 13 and the guide portion 14 is configured as a cutting edge 15, and the blade portion 13 and the guide portion 14 are formed with a plurality of twist grooves 16 in common. The peripheral surface 14a of the guide portion 14 is formed flat, and the diameter of the cylindrical surface including the peripheral surface 14a is set slightly smaller than the hole diameter d of the small diameter portion 1b of the first hole 1.
[0015]
By using such a tool 10, when finishing the small diameter portion 1b of the first hole 1, first, the guide portion 14 at the tip of the tool 10 is inserted into the small diameter portion 1b, and the blade portion 13 of the tool 10 is processed. It is guided concentrically to the first hole 1 which has been completed. As a result, the inner surface of the hole of the small diameter portion 1b is evenly deleted by the cutting edge 15, and the burr 4 is reliably removed.
[0016]
In the above-described embodiment, only the portion that intersects with the second hole 2 is defined as the small-diameter portion 1b when the first hole 1 is processed. However, in the present invention, the entire length of the first hole 1 is defined as the small-diameter portion. It may be formed. In this case, the tool 10 is passed through the entire length of the previously drilled hole (first hole) to finish the entire hole.
[0017]
【Example】
Example 1
The finishing dimension (hole diameter) of the first and second holes 1 and 2 is 6 mm, and the hole diameter d of the small diameter portion 1b of the first hole 1 to be drilled first, that is, the removal allowance δ by the tool 10 is from 0 to 0. The intersection hole was machined by the procedure shown in the above embodiment (FIG. 1) while changing the thickness to 55 mm, and the size of the burr remaining at the intersection was measured.
[0018]
FIG. 4 shows the result. In the case where the removal allowance δ is 0, that is, when the entire length of the first hole 1 is machined to the finishing dimension D from the beginning by the tool 8, it is generated by machining the second hole 2. It turns out that the burr 4 remains as it is. On the other hand, even when the removal allowance δ was set, when the removal allowance δ was remarkably small at 0.1 mm, the phenomenon that the burr was rather increased was observed. This is presumed to be due to the fact that since the removal allowance is small, no shearing phenomenon occurs at the time of machining with the tool 10 and new burrs are generated. In addition, when the removal allowance δ is set in the range of 0.25 mm to 0.55 mm, the effect of removing burrs is recognized, but when the removal allowance δ is 0.4 mm, almost no burrs remain, It was found to be extremely effective in removing burrs. Thus, the hole diameter d of the small-diameter portion 1b of the first hole 1 is in the range of δ = 0.25 mm at the minimum and δ = 0.55 mm at the maximum with the removal allowance δ = 0.4 mm as the center. 0.25 to 0.55 mm).
[0019]
Example 2
The finishing dimension (hole diameter) of the first and second holes 1 and 2 is 6 mm, and the hole diameter d of the small diameter portion 1b of the first hole 1 to be drilled first is -0.8 mm of the finishing diameter (removal allowance δ = 0.4 mm 2), the small-diameter portion 1 b is finished using the tool 10 having the above-described guide portion 14 and a general-purpose tool not having such a guide portion, and a first hole is formed when the small-diameter portion 1 b is formed. The amount of misalignment of the tool with respect to No. 1 was measured, and statistical values (average value, variation) were obtained. The number of measurements n is 10.
[0020]
FIG. 5 shows the results. In the case where the tool 10 having the guide portion 14 is used, the average value and the deviation (standard deviation) of the misalignment amount are compared with the case where the tool having no guide portion is used. Deviation) are significantly smaller. The small amount of misalignment means that the inner surface of the hole of the small-diameter portion 1b can be uniformly deleted even with a small removal allowance. Thus, for example, the above-described ideal value δ = 0.4 mm is set as the removal allowance δ. Thus, burrs can be safely and reliably removed.
[0021]
【The invention's effect】
As described above, according to the method for processing a crossed hole according to the present invention, burrs generated at the intersection of two holes can be reliably removed in the drilling process. This eliminates the need to provide them, which greatly contributes to improving productivity and reducing manufacturing costs.
Further, according to the drilling tool according to the present invention, it is possible to greatly reduce the misalignment with a simple configuration in which only the guide portion is provided at the tip, and it is possible to evenly remove the inner surface of the hole. This is suitable for implementing the above-described cross hole processing method.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a cross hole drilling method according to the present invention in order.
FIG. 2 is a front view showing the shape of a hole drilling tool according to the present invention.
FIG. 3 is a sectional view taken along arrows BB and CC of FIG. 2;
FIG. 4 is a graph showing the relationship between the removal allowance and the size of remaining burrs when finishing the first hole.
FIG. 5 is a graph showing the effect of the type of tool on the amount of misalignment when finishing the first hole.
FIG. 6 is a front view showing a crankshaft as one of the objects to be machined according to the present invention and a cross hole machined therein.
FIG. 7 is a sectional view taken along the line AA of FIG. 6;
FIG. 8 is a cross-sectional view showing a conventional method of forming a cross hole in order.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st hole, 1a large diameter part, 1b small diameter part 2 2nd hole 3 Oil hole (crossing hole)
4 Burr 8, 8 'First hole machining tool 9 Second hole machining tool 10 Tool for machining small diameter portion of first hole, 14 Guide portion of tool

Claims (3)

交差する二つの穴を切削加工する交差穴加工方法において、先に加工する第１の穴の、少なくとも第２の穴との交差部分を、所定の仕上寸法より小径に形成し、第２の穴を加工した後、前記第１の穴を所定の仕上寸法に仕上加工することを特徴とする交差穴加工方法。In a cross hole machining method for cutting two intersecting holes, at least an intersection of the first hole to be machined and the second hole is formed to have a diameter smaller than a predetermined finishing dimension, and the second hole is formed. And then finishing the first hole to a predetermined finish size. 第１の穴を仕上加工する際、第２の穴の加工方向に見て、該第２の穴が第１の穴に対して鈍角に交差する側から工具を進入させることを特徴とする請求項１に記載の交差穴加工方法。When finishing the first hole, a tool is inserted from a side where the second hole intersects the first hole at an obtuse angle when viewed in a processing direction of the second hole. Item 4. The method for processing a cross hole according to Item 1. 請求項１または２に記載の交差穴加工方法の実施に用いる工具であって、先端部に、穴の小径部分に嵌入可能なガイド部を設けたことを特徴とする穴加工用工具。3. A tool for use in carrying out the cross hole drilling method according to claim 1 or 2, wherein a guide portion is provided at a tip end thereof so as to be able to be fitted into a small diameter portion of the hole.
JP20384097A 1997-07-14 1997-07-14 Cross drilling method and drilling tool Expired - Fee Related JP3546915B2 (en)

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US7044690B1 (en) * 1999-02-19 2006-05-16 Joda Enterprises, Inc. Method and apparatus for registering a torque-transmitting tool in a fixture for forming a diagonal bore in the tool
JP4713318B2 (en) * 2005-11-28 2011-06-29 日信工業株式会社 Caliper body for disc brakes for vehicles
JP4948062B2 (en) * 2006-07-12 2012-06-06 コマツＮｔｃ株式会社 Deburring method and apparatus
KR101090662B1 (en) * 2008-06-13 2011-12-07 한라공조주식회사 Forming method of center hole of shaft for compressor
CN102335769A (en) * 2010-07-16 2012-02-01 上海汇大机械制造有限公司 Method and tool for processing precast hole with circumferential incomplete hole wall
CN102179541B (en) * 2011-05-10 2012-06-27 大足县生产力促进中心 Intersection cross hole processing method
CN102642114B (en) * 2012-04-10 2014-08-06 中信重工机械股份有限公司 Machining method of perpendicularly intersected hole system of speed reducer body
CN102921987B (en) * 2012-11-05 2014-10-29 河北华北柴油机有限责任公司 Fine deep hole machining burr preventing method
CN103231211A (en) * 2013-04-12 2013-08-07 长春航空液压控制有限公司 Finish machining method of thin-wall rocker sleeve
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CN110293373A (en) * 2019-06-20 2019-10-01 成都飞机工业（集团）有限责任公司 A kind of Cr16Ni6The processing method of the non-axis intersection PRECISION HOLE of material

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