JPH1133807A - Method and tool for machining of intersecting hole - Google Patents
Method and tool for machining of intersecting holeInfo
- Publication number
- JPH1133807A JPH1133807A JP20384097A JP20384097A JPH1133807A JP H1133807 A JPH1133807 A JP H1133807A JP 20384097 A JP20384097 A JP 20384097A JP 20384097 A JP20384097 A JP 20384097A JP H1133807 A JPH1133807 A JP H1133807A
- Authority
- JP
- Japan
- Prior art keywords
- hole
- tool
- burrs
- finishing
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
- Drilling Tools (AREA)
Abstract
Description
【0001】[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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for machining a crossed hole by cutting two intersecting holes with a tool, and a tool for drilling a hole used for carrying out the method.
【0002】[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。2. Description of the Related Art For example, an oil hole 3 in which two holes 1 and 2 cross each other is formed in a crankshaft of a vehicle engine as shown in FIGS. One of the two holes constituting the oil hole 3 (first hole) 1 is provided to penetrate 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】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()、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()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。[0003] By the way, the above-described machining of the oil hole 3 is generally carried out by first, as shown in FIG.
Is cut into the journal portion 6 to machine the first hole 1 (), and then another tool (drill) 9 is inserted into the pin portion 7.
And the second hole 2 is machined in a diagonal direction into the journal portion 6 from (). However, according to such a processing method, it is impossible to avoid the generation of burrs 4 at the intersection of the first hole 1 and the second hole 2, and if it is left as it is, it will not be possible to use the engine during use. The burrs 4 fall off, causing adverse effects such as seizure of the bearing metal.
【0004】[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。Therefore, conventionally, the burrs 4 are inserted by rotating the tools 8 and 9 into the holes 1 and 2 again, or by inserting a separately prepared wire brush into the holes. Had to be removed. 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】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。[0005] For example, in Japanese Patent Application Laid-Open No. 62-63004, when one of the first holes is crossed with the other hole, holes are alternately formed from two directions different by 180 degrees. A method has been proposed in which the burr generated in the first drilling of the other hole is removed by drilling from the next opposite side, but this method also involves repeated drilling with the same diameter tool. The occurrence of secondary burrs due to remaining burrs due to insufficient contact or misalignment is inevitable, and does not lead to a fundamental solution.
【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。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to reliably remove burrs generated at the intersection of two holes in a hole forming step. Accordingly, an object of the present invention is to provide a method of machining a cross hole, which eliminates the need for a special deburring step.
【0007】[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。In order to achieve the above object, a method of the present invention is to reduce the intersection of at least the first hole to be processed with at least the second hole to a diameter smaller than a predetermined finishing dimension. After forming and processing the second hole, the first hole is finished to a predetermined finish size. According to this method, burrs generated when processing the second hole are generated in the small diameter portion of the previously processed first hole. Therefore, the removal allowance (removal allowance) of the small diameter portion is set to an appropriate size. 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】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。In some cases, the second hole is formed so as to intersect with the first hole at an angle with respect to the first hole.
When finishing the first hole, it is preferable to make the tool enter from the side where the second hole intersects the first hole at an obtuse angle when viewed in the processing direction of the second hole. desirable. 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】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。[0009] The hole drilling tool of the present invention is for finishing the first hole, and is characterized in that 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. As described above, by providing the guide portion at the distal end, 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】[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。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【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。FIG. 1 shows a method of forming a cross hole 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, and the same portion as the portion shown in FIGS. A reference numeral will be attached. In processing the oil hole 3, first, as shown in FIG. 1, two tools (drills) 8, 8 'having different diameters are opposed by 180 degrees to a journal portion 6 of a crankshaft 5 (see FIG. 6). Cut from the side,
The first hole 1 is machined. The first hole 1 is composed of a large-diameter portion 1a machined to a predetermined finishing size by a tool 8 and a small-diameter portion 1b machined to a smaller diameter than the finishing 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).
【0012】次に、図1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。Next, as shown in FIG.
The tool (drill) 9 is cut obliquely from the pin portion 7 (see FIG. 6) into the journal portion 6 to machine the second hole 2. 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】その後、図1およびに示すように、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。Then, as shown in FIG. 1 and FIG. 1, a separately prepared hole drilling tool (drill) 10 described below is inserted into the small-diameter portion 1b of the first hole 1 previously machined from the side opposite to the large-diameter portion 1a. Then, the small diameter portion 1b is finished to a predetermined finishing dimension (D). At this time, since the removal allowance δ by the tool 10 is sufficient (δ = Δ / 2 = 0.4 mm), the burr 4 existing at the intersection is removed from the inner surface of the hole of the small-diameter portion 1b deleted by the tool 10. Is removed along with. Further, since the corner C 2 on the side where the tool 10 comes out of the second hole 2 is obtuse, the rigidity of the corner C 2 to be cut is sufficiently large, and the secondary burr is formed here. 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 deleted by the tool 10, but also the generation of secondary burrs is suppressed, and the oil holes 3 without burrs are completed.
【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。As shown in FIGS. 2 and 3, the drilling tool 10 is connected to a shank portion 11, a blade portion 13 having a leading edge 12, and a tip of the blade portion 13. The guide portion 14 has a smaller diameter than the blade portion 13. 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 14 a of the guide portion 14 is formed flat, and the diameter of the cylindrical surface including the peripheral surface 14 a is set slightly smaller than the hole diameter d of the small diameter portion 1 b of the first hole 1.
【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。By using such a tool 10,
When finishing the small diameter portion 1b of the first hole 1, the guide portion 14 at the tip of the tool 10 is first inserted into the small diameter portion 1b, and the blade portion 13 of the tool 10 is concentric with the processed first hole 1. Be guided. 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】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。In the above embodiment, only the portion that intersects with the second hole 2 is formed as the small-diameter portion 1b when the first hole 1 is machined. It may be formed as a small diameter portion. 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】[0017]
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。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 0. Was varied in various ways from 0.5 to 0.55 mm, the intersection hole was machined by the procedure shown in the above embodiment (FIG. 1), and the size of the burr remaining at the intersection was measured.
【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(0.25〜0.55
mm)に設定するのが望ましいといえる。FIG. 4 shows the result. When 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 with the tool 8, the second hole 2 is removed. It was found that the burrs 4 generated by the processing remained as they were.
On the other hand, even when the removal allowance δ is set, the removal allowance δ is 0.
In the case of extremely small size of 1 mm, the phenomenon that the burr was expanded rather was observed. This is presumed to be due to the fact that the removal margin is small, so that the shearing phenomenon does not occur during processing by the tool 10 and new burrs are generated. In addition, when the removal allowance δ was set in the range of 0.25 mm to 0.55 mm, the effect of removing burrs was observed in all cases. It was found to be remarkably effective. From this, the hole diameter d of the small diameter portion 1b of the first hole 1 is set to be at least δ = 0.4 mm around the removal allowance δ = 0.4 mm.
0.25mm, at most δ = 0.55mm range (0.25-0.55
mm) is desirable.
【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。Embodiment 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), the small-diameter portion 1b is finish-processed using the tool 10 having the above-described guide portion 14 and a general-purpose tool not having such a guide portion. The amount of misalignment of the tool with respect to the first hole 1 was measured, and statistical values (average value, variation) were obtained. The number of measurements n is 10.
【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。FIG. 5 shows the results. In the case where the tool 10 having the guide portion 14 is used, the average value of the amount of misalignment is larger than the case where the tool 10 having no guide portion is used. The variation (standard deviation) is significantly reduced. The small amount of misalignment means that the hole inner surface of the small-diameter portion 1b can be evenly removed with a small removal allowance. Thus, for example, the above-described ideal value δ = 0.4 mm is set as the removal allowance δ. As a result, it is possible to safely and reliably remove burrs.
【0021】[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。As described above, according to the method for machining 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 a deburring step, which greatly contributes to an improvement in productivity and a reduction in manufacturing cost.
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 delete the inner surface of the hole. Thus, the method is suitable for implementing the above-described cross hole processing method.
【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。FIG. 1 is a cross-sectional view showing a cross hole drilling method according to the present invention in order.
【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。FIG. 2 is a front view showing a shape of a hole drilling tool according to the present invention.
【図3】図2のB−BおよびC−C矢視線に沿う断面図
である。FIG. 3 is a sectional view taken along arrows BB and CC in FIG. 2;
【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。FIG. 4 is a graph showing the relationship between the removal allowance and the size of remaining burrs when finishing the first hole.
【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。FIG. 5 is a graph showing the effect of the type of tool on the amount of misalignment when finishing the first hole.
【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。FIG. 6 is a front view showing a crankshaft, which is one of the processing objects of the present invention, and a cross hole to be processed therein;
【図7】図6のA−A矢視線に沿う断面図である。FIG. 7 is a sectional view taken along the line AA of FIG. 6;
【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。FIG. 8 is a cross-sectional view showing a conventional method of forming a cross hole in order.
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 '1st hole drilling tool 9 2nd hole drilling tool 10 1st Tool for machining small diameter part of hole, 14 Guide part of tool
Claims (3)
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。1. A cross hole machining method for cutting two intersecting holes, wherein at least an intersection of the first hole to be machined with the second hole is formed to have a diameter smaller than a predetermined finishing dimension. Forming a second hole, and then finishing the first hole to a predetermined finish size.
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。2. When finishing a 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. The method of claim 1, wherein:
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 used for carrying out the method for drilling a cross hole according to claim 1, wherein a guide portion which can be fitted into a small-diameter portion of the hole is provided at a tip end portion. Tools.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20384097A JP3546915B2 (en) | 1997-07-14 | 1997-07-14 | Cross drilling method and drilling tool |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20384097A JP3546915B2 (en) | 1997-07-14 | 1997-07-14 | Cross drilling method and drilling tool |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1133807A true JPH1133807A (en) | 1999-02-09 |
JP3546915B2 JP3546915B2 (en) | 2004-07-28 |
Family
ID=16480579
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20384097A Expired - Fee Related JP3546915B2 (en) | 1997-07-14 | 1997-07-14 | Cross drilling method and drilling tool |
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JP (1) | JP3546915B2 (en) |
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