JP2601117Y2 - Drilling threaded connection tool for through holes - Google Patents
Drilling threaded connection tool for through holesInfo
- Publication number
- JP2601117Y2 JP2601117Y2 JP1992055530U JP5553092U JP2601117Y2 JP 2601117 Y2 JP2601117 Y2 JP 2601117Y2 JP 1992055530 U JP1992055530 U JP 1992055530U JP 5553092 U JP5553092 U JP 5553092U JP 2601117 Y2 JP2601117 Y2 JP 2601117Y2
- Authority
- JP
- Japan
- Prior art keywords
- blade
- cutting
- thread
- threaded
- tool
- 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.)
- Expired - Lifetime
Links
Landscapes
- Drilling Tools (AREA)
Description
【0001】[0001]
【産業上の利用分野】本考案は、被加工物に下穴を加工
する穿孔刃とその下穴に雌ねじを加工するねじ切り刃と
を一体に備えた通り穴用穿孔ねじ切り結合工具の改良に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a through hole threading connection tool for integrally drilling a through hole for machining a prepared hole in a workpiece and a thread cutting blade for machining an internal thread in the prepared hole. It is.
【0002】[0002]
【従来の技術】雌ねじを切削加工するための工具として
ねじ切りフライスがある。これは、形成すべき雌ねじの
ねじ溝に対応する形状のねじ切り刃を外周部に備え、例
えばNCフライス盤やマシニングセンタなどに取り付け
られて軸心まわりに回転駆動されつつ、被加工物の下穴
内周面に切込みを加える状態でその下穴の周方向および
軸方向へ相対移動させられることにより、その下穴内周
面に雌ねじを切削加工するもので、上記ねじ切り刃を軸
方向に複数連なって備えた多山ねじ切りフライスが広く
用いられている。このようなねじ切りフライスを用いて
雌ねじを切削加工する場合、その前工程として形成すべ
き雌ねじの内径と略同一寸法の下穴を予め穿孔しておく
必要があるが、穿孔専用工具を用いる方法では工具交換
のための設備と時間が必要であるため、最近では、ねじ
切りフライスの先端に穿孔工具を一体に設けた結合工具
が提案されている。特開昭63−200916号公報や
特開平3−184722号公報に記載されている工具は
その一例であり、雌ねじを加工するためのねじ切り刃の
外径は、下穴を加工する穿孔刃の外径と同じか、下穴加
工時に下穴内周面と干渉することを防止する上で穿孔刃
の外径より少し小さめとされている。2. Description of the Related Art There is a thread milling tool as a tool for cutting an internal thread. This is provided with a thread cutting blade having a shape corresponding to a thread groove of a female screw to be formed on an outer peripheral portion, and is attached to, for example, an NC milling machine or a machining center, and is driven to rotate around an axis. A female screw is cut on the inner peripheral surface of the prepared hole by being relatively moved in the circumferential direction and the axial direction of the prepared hole in a state where a notch is added to the prepared hole. Thread milling cutters are widely used. When cutting a female screw using such a thread milling cutter, it is necessary to pre-drill a prepared hole having substantially the same inner diameter as the inner diameter of the female screw to be formed as a pre-process, but in a method using a dedicated drilling tool, Due to the need for equipment and time for tool change, recently, a coupling tool in which a drilling tool is integrally provided at the tip of a thread milling cutter has been proposed. The tools described in JP-A-63-200916 and JP-A-3-184722 are examples, and the outer diameter of a thread cutting blade for machining a female screw is equal to the outside diameter of a drilling blade for machining a pilot hole. The diameter is the same as or slightly smaller than the outer diameter of the drilling blade in order to prevent interference with the inner peripheral surface of the prepared hole at the time of preparing the prepared hole.
【0003】[0003]
【考案が解決しようとする課題】ところで、上記ねじ切
りフライスのように、リードの無いねじ切り刃でリード
のある雌ねじを切削加工する場合、雌ねじのねじ溝形状
がねじ切り刃の形状より大きくなる干渉切削が避けられ
ず、これは、リードの大きい雌ねじを加工する場合や、
フライス径が加工すべき雌ねじの谷径と近い場合に顕著
となる。上述した従来の穿孔ねじ切り結合工具は、ねじ
切り刃の外径が穿孔刃の外径(下穴径)と略等しいた
め、雌ねじの内径は一般に谷径の85〜95%程度で、
その内径は下穴径と略等しいことから、谷径に対するね
じ切り刃の外径は同じく85〜95%程度となり、上記
干渉切削が問題となる。この対策として、干渉による切
削分を考慮してねじ切り刃の刃幅を狭くすることが行わ
れているが、このような刃形修正には強度的に限界があ
る。In the case of cutting a female screw having a lead with a screw blade having no lead, such as the above-mentioned screw milling cutter, interference cutting in which the thread groove shape of the female screw is larger than the shape of the screw cutting blade is required. Inevitably, this is when machining internal threads with large leads,
This becomes remarkable when the milling diameter is close to the root diameter of the internal thread to be machined. In the above-described conventional drilling threaded connection tool, since the outer diameter of the threading blade is substantially equal to the outer diameter (prepared hole diameter) of the drilling blade, the inner diameter of the female screw is generally about 85 to 95% of the root diameter,
Since the inner diameter is substantially equal to the pilot hole diameter, the outer diameter of the thread cutting blade with respect to the root diameter is also about 85 to 95%, and the interference cutting becomes a problem. As a countermeasure, the blade width of the thread cutting blade is reduced in consideration of the amount of cutting caused by interference, but such blade shape correction has a limit in strength.
【0004】本考案は以上の事情を背景として為された
もので、その目的とするところは、干渉切削が少ない通
り穴用の穿孔ねじ切り結合工具を提供することにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drilling and threading connection tool for a hole through which interference cutting is reduced.
【0005】[0005]
【課題を解決するための手段】かかる目的を達成するた
めに、本考案は、下穴を切削加工する穿孔刃を軸方向前
端部に有するとともに、その穿孔刃によって形成された
下穴に雌ねじを切削加工するリードの無い多山ねじ切り
刃がその穿孔刃よりも軸方向後部側に一体に設けられ、
軸心まわりに回転駆動されつつ被加工物に対して軸方向
へ相対移動させられることにより前記穿孔刃によってそ
の穿孔刃の径寸法と略等しい径寸法で被加工物を貫通す
る下穴を加工した後に、軸心まわりに回転駆動されつつ
その下穴内を軸方向および周方向へ相対移動させられる
ことにより前記多山ねじ切り刃によってその下穴の内周
面に内径が下穴径と略等しい雌ねじを切削加工する、通
り穴用の穿孔ねじ切り結合工具において、(a)前記多
山ねじ切り刃の外径を前記穿孔刃の外径の90%以下と
し、(b)前記多山ねじ切り刃の工具軸方向における前
端に、最大径がその多山ねじ切り刃の外径より大きくて
その多山ねじ切り刃により雌ねじを切削加工する際に前
記下穴の開口部に面取りを行う第2面取り刃をその多山
ねじ切り刃の頂部に連続して設けたことを特徴とする。In order to achieve the above object, the present invention has a drilling blade for cutting a pilot hole at an axial front end, and a female screw in a pilot hole formed by the drilling blade. A multi-thread thread cutting blade without a lead to be cut is provided integrally on the axial rear side of the drilling blade,
A pilot hole penetrating the workpiece with a diameter substantially equal to the diameter of the drilling blade was formed by the drilling blade by being relatively moved in the axial direction with respect to the workpiece while being rotated around the axis. Later, an internal thread whose inner diameter is substantially equal to the pilot hole diameter is formed on the inner peripheral surface of the pilot hole by the multi-thread screw cutting blade by being relatively moved in the pilot hole in the axial direction and the circumferential direction while being rotationally driven around the axis. In a boring thread cutting coupling tool for a through hole to be cut, (a) the outer diameter of the multi-threaded screw cutting blade is 90% or less of the outer diameter of the drilled blade , and (b) the tool axial direction of the multi-threaded screw cutting blade. Before
At the end, the maximum diameter is larger than the outer diameter of the
Before cutting the internal thread with the multi-threaded cutting blade
The second chamfering blade for chamfering the opening of the prepared hole
It is characterized in that it is provided continuously on the top of the thread cutting blade .
【0006】[0006]
【作用および考案の効果】このような通り穴用穿孔ねじ
切り結合工具においては、多山ねじ切り刃の外径が穿孔
刃の外径の90%以下であるため、加工すべき雌ねじの
谷径に対する多山ねじ切り刃の外径の割合が小さくな
り、例えば内径が谷径の95%程度の雌ねじを切削加工
する場合には、多山ねじ切り刃の外径は雌ねじ谷径の8
5%程度以下となり、内径が谷径の85%程度の雌ねじ
を切削加工する場合には、多山ねじ切り刃の外径は雌ね
じ谷径の76%程度以下となる。これにより、干渉切削
量が少なくなり、その干渉切削を考慮した刃形修正量
も、強度的に実用上問題のない範囲で済むようなる。[Effects of the operation and the invention] In such a threaded connection tool for drilling a through-hole, since the outer diameter of the multi-threaded screw cutting blade is 90% or less of the outer diameter of the drilling blade, the outer diameter of the multi-threaded cutting blade is smaller than the root diameter of the internal thread to be machined. When the ratio of the outer diameter of the thread cutting edge is reduced, for example, when cutting an internal thread having an inner diameter of about 95% of the root diameter, the outer diameter of the multi-threaded cutting edge is 8 times the female thread root diameter.
When cutting a female screw having an inner diameter of about 85% of the root diameter, the outer diameter of the multi-threaded screw cutting blade is about 76% or less of the female screw root diameter. As a result, the amount of interference cutting is reduced, and the amount of correction of the blade shape in consideration of the interference cutting can be within a range in which there is no practical problem in terms of strength.
【0007】M10×1.5の60°三角ねじを加工す
る場合について具体的に説明すると、JISねじ山形に
おける谷の丸みの許容範囲tは、尖り山山頂からの寸法
で尖り山の高さの1/8までであり、ピッチが1.5m
mの60°ねじの場合は、尖り山の高さが約1.299
mmであるためt≒0.162mmとなる。この場合
に、穿孔刃の外径を雌ねじの内径8.5mmと等しく
し、多山ねじ切り刃の外径をその100%すなわち8.
5mmとした時、干渉切削による谷の丸みの尖り山山頂
からの範囲ta を計算によって求めると約0.208m
mとなり、上記許容範囲t≒0.162mmを超える。
図7の(a)は、この場合の切削状態を示したもので、
斜線部が干渉切削範囲である。これに対し、多山ねじ切
り刃の外径を穿孔刃の外径(雌ねじ内径)の90%、す
なわち7.65mmとした場合には、干渉切削による谷
の丸みの尖り山山頂からの範囲tb ≒0.114mmと
なり、許容範囲t≒0.162mmより小さくなる。図
7の(b)は、この場合の切削状態を示したもので、斜
線部が干渉切削範囲である。多山ねじ切り刃の外径を穿
孔刃の外径(雌ねじ内径)の80%、すなわち6.8m
mとした場合には、干渉切削による谷の丸みの尖り山山
頂からの範囲は0.072mmとなり、多山ねじ切り刃
の外径を穿孔刃の外径(雌ねじ内径)の70%、すなわ
ち5.95mmとした場合には、干渉切削による谷の丸
みの尖り山山頂からの範囲は0.052mmとなり、多
山ねじ切り刃の外径を穿孔刃の外径(雌ねじ内径)の6
0%、すなわち5.1mmとした場合には、干渉切削に
よる谷の丸みの尖り山山頂からの範囲は0.041mm
となる。90%の場合、許容範囲tとの間に0.162
−0.114=0.048mmの余裕があるが、ねじ切
り刃の山頂はチッピングを防ぐため、実用的には少なく
とも0.02〜0.04mm程度の切り取りによる平部
またはR部を必要とし、これを考慮すると90%弱とな
り、実用的に90%以下とすることの必要性がわかる。[0007] A specific description will be given of a case where a 60 ° triangular screw of M10 x 1.5 is machined. The allowable range t of the roundness of the valley in the JIS thread form is the dimension from the peak of the peak and the height of the peak. Up to 1/8, pitch 1.5m
In the case of a 60 ° screw of m, the height of the peak is about 1.299.
mm, t ≒ 0.162 mm. In this case, the outer diameter of the drilling blade is made equal to the inner diameter of the internal thread of 8.5 mm, and the outer diameter of the multi-threaded cutting blade is set to 100% thereof, that is, 8.
When a 5 mm, about the determined by calculation range t a from the mountain peaks pointed rounded valley due to interference cutting 0.208m
m, which exceeds the allowable range t 範 囲 0.162 mm.
FIG. 7A shows a cutting state in this case.
The hatched area is the interference cutting range. On the other hand, when the outer diameter of the multi-threaded screw cutting blade is 90% of the outer diameter (inner diameter of the internal thread) of the drilling blade, that is, 7.65 mm, the range t b from the peak of the rounded valley due to interference cutting to the peak is obtained. ≒ 0.114 mm, which is smaller than the allowable range t ≒ 0.162 mm. FIG. 7B shows the cutting state in this case, and the hatched portion is the interference cutting range. The outer diameter of the multi-threaded cutting blade is 80% of the outer diameter (inner thread inner diameter) of the drilling blade, that is, 6.8 m.
m, the range from the peak of the peak of the roundness of the valley due to interference cutting is 0.072 mm, and the outer diameter of the multi-threaded cutting blade is 70% of the outer diameter of the drilling blade (inner diameter of the internal thread), that is, 5. In the case of 95 mm, the range from the peak of the rounded valley due to interference cutting to the peak is 0.052 mm, and the outer diameter of the multi-threaded cutting blade is 6 times the outer diameter of the drilling blade (inner diameter of the internal thread).
In the case of 0%, that is, 5.1 mm, the range from the peak of the peak of the rounded valley due to interference cutting is 0.041 mm.
Becomes In the case of 90%, 0.162 is set between the allowable range t.
Although there is a margin of -0.114 = 0.048 mm, the peak of the thread cutting blade needs a flat portion or an R portion by cutting at least about 0.02 to 0.04 mm practically to prevent chipping. In consideration of the above, it is slightly less than 90%, and it is understood that it is practically necessary to make the content 90% or less.
【0008】ここで、穿孔刃の外径に対する多山ねじ切
り刃の外径の割合を小さくする程干渉切削量は少なくな
るが、それに伴って工具のたわみ剛性や捩り強度、抗折
力、切屑排出性が悪くなるため、多山ねじ切り刃の外径
は、穿孔刃の外径の70%程度以上の範囲で設定するこ
とが望ましい。70%以下では、これを更に小さくして
も干渉切削量は殆ど変わらず、それよりも工具の剛性や
強度を重視することが必要となるのである。[0008] Here, the smaller the ratio of the outer diameter of the multi-threaded screw cutting blade to the outer diameter of the drilling blade, the smaller the amount of interference cutting, but the flexural rigidity and torsional strength of the tool, bending force, chip discharge. Therefore, the outer diameter of the multi-threaded cutting blade is desirably set to a range of about 70% or more of the outer diameter of the drilling blade. If it is less than 70%, even if it is further reduced, the amount of interference cutting hardly changes, and it is necessary to emphasize the rigidity and strength of the tool.
【0009】また、上記多山ねじ切り刃よりも工具軸方
向の後部側に、最大径が前記穿孔刃の外径より大きくて
軸心まわりに回転駆動されつつ軸方向へ相対移動させら
れることにより下穴の入口側に面取りを行う第1面取り
刃を設ければ、多山ねじ切り刃による雌ねじの加工前ま
たは加工後において、単一の工具により下穴の入口側に
面取り加工を連続して行うことが可能となり、面取り用
の専用工具を用いる場合に比較して加工設備や加工時間
を節減できる。[0009] Further, at the rear side in the tool axis direction with respect to the multi-threaded cutting blade, the maximum diameter is larger than the outer diameter of the drilling blade, and is relatively moved in the axial direction while being rotationally driven around the axis. If the first chamfering blade for chamfering is provided on the inlet side of the hole, the chamfering process can be continuously performed on the inlet side of the pilot hole with a single tool before or after machining of the internal thread by the multi-threaded screw cutting blade. This makes it possible to reduce processing equipment and processing time as compared with the case where a dedicated tool for chamfering is used.
【0010】また、前記多山ねじ切り刃の工具軸方向に
おける前端に、最大径がその多山ねじ切り刃の外径より
大きくてその多山ねじ切り刃により雌ねじを切削加工す
る際に前記下穴の開口部に面取りを行う第2面取り刃が
その多山ねじ切り刃の頂部に連続して設けられるので、
多山ねじ切り刃による雌ねじの加工時に下穴の出口側の
面取り加工が同時に行われ、面取り用の専用工具を用い
る場合に比較して加工設備や加工時間が節減される。ま
た、その面取りによって雌ねじ開口部の不完全ねじ山が
面取りされるため、そのような不完全ねじ山の変形や損
傷に起因する雌ねじ寿命の低下が防止される。In addition, at the front end in the tool axis direction of the multi-thread screw cutting blade, the maximum diameter is larger than the outer diameter of the multi-thread screw cutting blade, and when the female screw is cut by the multi-thread screw cutting blade, the opening of the pilot hole is formed. since the second chamfered edge performing chamfered section is <br/> continuously provided on top of the Tayama threaded blade,
When the female screw is machined by a multi-threaded cutting blade, chamfering on the exit side of the prepared hole is performed at the same time, so that machining equipment and machining time are reduced as compared with the case where a dedicated tool for chamfering is used. In addition, since the incomplete thread at the female screw opening is chamfered by the chamfering, the life of the internal thread due to the deformation or damage of such incomplete thread is prevented.
【0011】また、前記多山ねじ切り刃の工具軸方向に
おける前端および後端の少なくとも一方に、その多山ね
じ切り刃の外径と略等しい外径の不完全山削除用切れ刃
をその多山ねじ切り刃の頂部に連続して設ければ、多山
ねじ切り刃による雌ねじの加工時に下穴の入口側や出口
側における不完全ねじ山が除去されるため、そのような
不完全ねじ山の変形や損傷に起因する雌ねじ寿命の低下
が防止される。[0011] In addition, at least one of the front end and the rear end of the multi-thread screw cutting blade in the tool axis direction is provided with a multi-thread screw cutting blade having an outer diameter substantially equal to the outer diameter of the multi-thread screw cutting blade. If provided continuously at the top of the blade, the incomplete threads at the entrance side and exit side of the prepared hole will be removed when the internal thread is machined with a multi-threaded cutting blade, so deformation or damage of such incomplete threads , The life of the female screw is prevented from being shortened.
【0012】また、前記多山ねじ切り刃の工具軸方向に
おける長さ寸法を、雌ねじを加工すべき前記被加工物の
肉厚と略同じ寸法とすれば、雌ねじ加工に必要な工具の
下穴に対する公転回数は通常1回転半(食付き、逃げを
除く実質的なねじ加工は1回転)であるため、その雌ね
じの切削加工時に前記第2面取り刃により下穴の出口側
に面取りを行ったり、不完全山削除用切れ刃により下穴
の入口側および出口側の双方の不完全ねじ山を削除した
りすることができる。すなわち、1回転の公転で雌ねじ
を切削加工する場合には、工具は1ピッチ分だけ軸方向
へ移動するため、多山ねじ切り刃の長さ寸法を被加工物
の肉厚より1ピッチ程度短くすれば、下穴の両端部にそ
れぞれ最大1ピッチ程度の面取りや不完全ねじ山の除去
を行うことができる。下穴の入口側については前記第1
面取り刃で面取りが行われ、下穴の出口側については上
記第2面取り刃で面取りが行われるようにしても良く、
その場合には、多山ねじ切り刃の工具軸方向における長
さ寸法が被加工物の肉厚より大きくても差支えない。な
お、多山ねじ切り刃の工具軸方向における長さ寸法が被
加工物の肉厚より大きい場合に、上記第2面取り刃で下
穴の出口側の面取りを行ったり不完全山削除用切れ刃で
下穴両端の不完全ねじ山を除去したりするには、例えば
雌ねじ加工後に工具を軸方向へずらすか、雌ねじ加工時
に工具を下穴の周方向へ何回も公転させつつ軸方向へ移
動させるかして、下穴の両端に面取り加工や不完全ねじ
山の除去が行われるようにすれば良い。If the length of the multi-threaded cutting blade in the tool axis direction is substantially the same as the thickness of the workpiece on which the female screw is to be machined, the length of the tool hole required for machining the internal thread can be reduced. The number of revolutions is usually one and a half revolutions (bite, escape
(Except for the actual screw processing is one rotation) , so the second chamfer blade at the exit side of the pilot hole when cutting the internal thread
In addition, the incomplete thread on both the entrance side and the exit side of the prepared hole can be removed by the incomplete thread removal cutting edge. That is , when the female screw is cut by one revolution, the tool moves in the axial direction by one pitch, so that the length of the multi-thread screw cutting blade is shortened by about one pitch from the thickness of the workpiece. For example, it is possible to perform chamfering of about 1 pitch at maximum and removal of incomplete threads at both ends of the pilot hole. For the entrance side of the pilot hole,
The chamfering may be performed by the chamfering blade, and the second chamfering blade may be chamfered on the exit side of the prepared hole,
In this case, the length of the multi-threaded cutting blade in the tool axis direction may be larger than the thickness of the workpiece. If the length of the multi-threaded cutting edge in the tool axis direction is larger than the thickness of the workpiece, the second chamfering blade may be used to perform chamfering on the exit side of the prepared hole or may be performed using the incomplete mountain-removing cutting edge. To remove incomplete threads at both ends of the pilot hole, for example, shift the tool in the axial direction after female screw machining, or move the tool in the axial direction while revolving the tool many times in the circumferential direction of the pilot hole during female screw machining Thus, chamfering and incomplete thread removal may be performed on both ends of the prepared hole.
【0013】また、前記多山ねじ切り刃および穿孔刃
が、工具軸方向に延びている共通のランドに形成されて
いる場合には、その穿孔刃のランド外周部にマージンを
設けておくことが望ましい。すなわち、多山ねじ切り刃
の再研削は通常すくい面で行われるため、穿孔刃が多山
ねじ切り刃と共通のランドに形成されている場合には、
その多山ねじ切り刃の再研削時に穿孔刃のすくい面も研
削され、マージンが設けられていないと研削に伴って穿
孔刃の外径、更には下穴径が小さくなってしまうのであ
るが、穿孔刃のランド外周部にマージンを設けておけ
ば、その多山ねじ切り刃の再研削に拘らず穿孔刃の外径
が一定に維持されるのである。When the multi-threaded cutting blade and the drilling blade are formed on a common land extending in the tool axis direction, it is desirable to provide a margin around the land of the drilling blade. . That is, since the re-grinding of the multi-threaded cutting blade is usually performed on the rake face, when the drilling blade is formed on a common land with the multi-threaded screw cutting blade,
The rake face of the drilling blade is also ground at the time of re-grinding of the multi-threaded screw cutting blade, and if there is no margin, the outer diameter of the drilling blade and further the diameter of the pilot hole will decrease with grinding, but drilling If a margin is provided on the outer periphery of the land of the blade, the outer diameter of the drilling blade is kept constant regardless of the re-grinding of the multi-threaded cutting blade.
【0014】[0014]
【実施例】以下、本考案の一実施例を図面に基づいて詳
細に説明する。図1は、本考案の一実施例である通り穴
用穿孔ねじ切り結合工具(以下、単に結合工具という)
10を軸心と直角な方向から見た正面図で、図2は、そ
の結合工具10を先端側から見た底面図である。かかる
結合工具10は、NCフライス盤等に把持されて軸心ま
わりに回転駆動されるシャンク12と、被加工物に切削
加工を行う刃部14とを一体に備えている。刃部14に
は、回転切削方向すなわちこの実施例では右まわりにね
じれた一対のねじれ溝16が軸心に対して対称的に形成
され、工具軸方向に延びるとともに螺旋状にねじれた一
対のランド18が設けられている。なお、図2ではシャ
ンク12が省略されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention. As shown in FIG.
FIG. 2 is a front view of the connecting tool 10 as viewed from a direction perpendicular to the axis, and FIG. 2 is a bottom view of the connecting tool 10 as viewed from the front end side. The coupling tool 10 integrally includes a shank 12 that is gripped by an NC milling machine or the like and driven to rotate about an axis, and a blade portion 14 that performs a cutting process on a workpiece. A pair of helical grooves 16 are formed in the blade portion 14 in a rotational cutting direction, that is, clockwise in this embodiment, symmetrically with respect to the axis, and a pair of lands that extend in the tool axis direction and are helically twisted. 18 are provided. In FIG. 2, the shank 12 is omitted.
【0015】上記ランド18の工具軸方向における前端
部には穿孔刃20が設けられている。穿孔刃20は底刃
22および外周刃(リーディングエッジ)24を備えて
おり、外周刃24の径寸法(穿孔刃20の外径)d1 は
加工すべき雌ねじの内径と同じか少し小さめとされてい
るとともに、穿孔刃20の外周部には外周刃24に連続
して同一寸法のマージン26が設けられている。また、
ランド18の工具軸方向における中間部、すなわち上記
穿孔刃20よりも工具軸方向の後部側には、リードの無
い多山ねじ切り刃28が設けられている。この多山ねじ
切り刃28の外径寸法d2 は、上記外周刃24の径寸法
d1 の70%〜90%の範囲内で定められているととも
に、多山ねじ切り刃28の工具軸方向における長さ寸法
Lは、雌ねじを加工すべき被加工物30(図3参照)の
肉厚と略同じ、この実施例では多山ねじ切り刃28のね
じ山の0.5ピッチ程度だけ短い寸法に定められてい
る。A drilling blade 20 is provided at the front end of the land 18 in the tool axis direction. Cutting head 20 is provided with a bottom edge 22 and the peripheral cutting edge (leading edge) 24, d 1 (the outer diameter of the cutting head 20) diameter of the peripheral cutting edge 24 is equal to or slightly smaller inner diameter of the internal thread to be processed In addition, a margin 26 having the same size is provided on the outer peripheral portion of the drilling blade 20 so as to be continuous with the outer peripheral blade 24. Also,
An intermediate portion of the land 18 in the tool axis direction, that is, a rear side of the drilling blade 20 in the tool axis direction with respect to the tool axis direction, is provided with a leadless multi-threaded cutting blade 28. Outer diameter d 2 of the Tayama threaded blade 28, together are defined within the range of 70% to 90% of the diameter d 1 of the outer peripheral cutting edge 24, the long in the tool axis direction of Tayama threaded blade 28 The dimension L is substantially the same as the thickness of the workpiece 30 (see FIG. 3) on which the female screw is to be machined. In this embodiment, the dimension L is set to a dimension shorter by about 0.5 pitch of the thread of the multi-threaded cutting blade 28. ing.
【0016】上記多山ねじ切り刃28の工具軸方向にお
ける前端、すなわち穿孔刃20と多山ねじ切り刃28と
の間の部分には、穿孔刃20から多山ねじ切り刃28に
向かうに従って小径となる面取り刃32が、穿孔刃20
の外周刃24から多山ねじ切り刃28の頂部に連続して
設けられている。また、多山ねじ切り刃28の工具軸方
向における後端には、その多山ねじ切り刃28の外径寸
法d2 と略等しい外径の不完全山削除用切れ刃34が、
多山ねじ切り刃28の頂部に連続して設けられている。
これ等の面取り刃32,不完全山削除用切れ刃34の工
具軸方向における長さ寸法は、それぞれ多山ねじ切り刃
28のねじ山の1ピッチと略同じ寸法である。面取り刃
32は第2面取り刃に相当する。At the front end of the multi-threaded cutting blade 28 in the tool axis direction, that is, at a portion between the drilling blade 20 and the multi-threaded cutting blade 28, a chamfer having a smaller diameter from the drilling blade 20 toward the multi-threaded cutting blade 28. The blade 32 is the piercing blade 20
From the outer peripheral blade 24 to the top of the multi-threaded thread cutting blade 28. Further, at the rear end of the multi-threaded screw cutting blade 28 in the tool axis direction, an incomplete mountain-cutting cutting edge 34 having an outer diameter substantially equal to the outer diameter d 2 of the multi-threaded screw cutting blade 28 is provided.
The multi-threaded cutting blade 28 is provided continuously at the top.
The lengths of the chamfering blade 32 and the incomplete ridge removing cutting edge 34 in the tool axis direction are substantially the same as one pitch of the threads of the multi-threaded screw cutting blade 28, respectively. The chamfer blade 32 corresponds to a second chamfer blade.
【0017】前記ねじれ溝16はシャンク12の前端部
まで達しており、上記不完全山削除用切れ刃34の後部
には、シャンク12に向かう程大径となる面取り刃36
が、その不完全山削除用切れ刃34に連続して設けられ
ている。面取り刃36は第1面取り刃に相当し、その最
大径はシャンク12の径寸法と同じで前記穿孔刃20の
外径寸法d1 より大きい。The torsion groove 16 reaches the front end of the shank 12, and a chamfering blade 36 having a diameter increasing toward the shank 12 is provided at the rear of the incomplete mountain removing cutting edge 34.
Are provided continuously to the incomplete mountain removing cutting edge 34. Chamfering blade 36 corresponds to a first chamfer edge, larger than the outer diameter d 1 of the maximum diameter the cutting head 20 the same as the diameter of the shank 12.
【0018】以上のように構成された結合工具10は、
例えばNCフライス盤やマシニングセンタなどに取り付
けられて雌ねじの切削加工に用いられる。図3は、ワー
ク取付位置に固定された被加工物30に対して結合工具
10が予め定められた初期位置に位置させられた状態で
あり、その後、矢印a〜fで示されているように順次移
動させられることにより、その被加工物30に雌ねじを
加工する。図4および図5は、かかる雌ねじ加工時の各
工程を示す図で、(a)〜(f)はそれぞれ図3におけ
る矢印の符号に対応する。以下、この雌ねじ加工工程に
ついて具体的に説明する。The coupling tool 10 configured as described above is
For example, it is attached to an NC milling machine, a machining center, or the like, and is used for cutting a female screw. FIG. 3 shows a state in which the coupling tool 10 is positioned at a predetermined initial position with respect to the workpiece 30 fixed at the workpiece mounting position, and thereafter, as shown by arrows a to f. The female thread is machined in the workpiece 30 by being sequentially moved. FIG. 4 and FIG. 5 are views showing each process at the time of such internal thread processing, and (a) to (f) correspond to the reference numerals of the arrows in FIG. Hereinafter, the female screw processing step will be specifically described.
【0019】先ず、図3の初期位置において結合工具1
0は軸心まわりに回転駆動され、矢印aで示されている
ように軸方向へ送られる。図4の(a)はこの状態であ
り、被加工物30には穿孔刃20によって下穴40が切
削加工されるとともに、その下穴40の上端開口部すな
わち入口側の開口部には、面取り刃36によって面取り
42が施される。結合工具10は軸心まわりに回転駆動
されつつ軸方向へ送られるだけであるため、下穴40の
径寸法は穿孔刃20の外径d 1 と略同じであり、加工す
べき雌ねじの内径と同じか少し小さめである。その後、
結合工具10は矢印bで示されているように上方へ持ち
上げられ、図4の(b)の状態となる。この位置は、不
完全山削除用切れ刃34が多山ねじ切り刃28のねじ山
の略1ピッチ分だけ下穴40内に入り込むとともに、多
山ねじ切り刃28の下端部(先端部)がねじ山の0.5
ピッチ程度だけ下穴40から下方へ突き出すように定め
られている。First, at the initial position shown in FIG.
0 is rotationally driven around the axis and is fed in the axial direction as shown by the arrow a. FIG. 4A shows this state. In the workpiece 30, a prepared hole 40 is cut by the drilling blade 20, and a chamfer is formed in an upper end opening of the prepared hole 40, that is, an opening on the entrance side. The chamfer 42 is performed by the blade 36. The coupling tool 10 is driven to rotate around the axis.
Is only sent in the axial direction while being
Diameter is substantially equal to the outer diameter d 1 of the cutting head 20 is the same or slightly smaller inner diameter of the internal thread to be processed. afterwards,
The coupling tool 10 is lifted upward as shown by the arrow b, and is in the state of FIG. This position is such that the incomplete thread removing cutting edge 34 enters the prepared hole 40 by approximately one pitch of the thread of the multi-threaded screw cutting blade 28, and the lower end (tip) of the multi-threaded screw cutting blade 28 is threaded. 0.5
It is determined so as to protrude downward from the pilot hole 40 by about the pitch.
【0020】次に、結合工具10は軸心まわりに回転駆
動されつつ矢印cで示されているように下穴40の径方
向へ移動させられ、多山ねじ切り刃28がその下穴40
の内周面に切り込む。この径方向への移動量は、形成す
べき雌ねじの谷径から多山ねじ切り刃28の外径d2 を
差し引いた寸法の1/2である。図4の(c)はこの状
態であり、下穴40の内周面の一部に多山ねじ切り刃2
8に対応するねじ山が形成されるとともに、前記面取り
42の一部が不完全山削除用切れ刃34によって切削除
去される。続いて、結合工具10は軸心まわりに回転駆
動されつつ、矢印dで示されているように下穴40の中
心まわりに1回転半公転させられるとともに、多山ねじ
切り刃28のねじ山の1.5ピッチだけ上方へ持ち上げ
られる。結合工具10の公転方向は上側から見て左まわ
り方向であり、これにより、図4の(d)に示されてい
るように、下穴40の内周面に多山ねじ切り刃28のね
じ山のピッチと等しいピッチの右ねじの雌ねじ44が形
成される。また、前記不完全山削除用切れ刃34によ
り、面取り42の一部に雌ねじ44の谷径と略同じ内径
の円筒面46が形成されるとともに、雌ねじ44の下端
開口部すなわち出口側の開口部には、面取り刃32によ
って面取り48が施される。これ等の円筒面46,面取
り48を形成する不完全山削除用切れ刃34,面取り刃
32は、何れも多山ねじ切り刃28の頂部に接続されて
いるため、その多山ねじ切り刃28によって形成される
雌ねじ44の両端部に不完全ねじ山が形成されることが
防止される。Next, the coupling tool 10 is moved in the radial direction of the prepared hole 40 as shown by an arrow c while being rotated around the axis, and the multi-threaded screw cutting blade 28 is
Cut into the inner peripheral surface of. The amount of movement in the radial direction is 寸 法 of the dimension obtained by subtracting the outer diameter d 2 of the multi-threaded cutting blade 28 from the root diameter of the female screw to be formed. FIG. 4C shows this state, in which the multi-threaded cutting blade 2
8 are formed, and a part of the chamfer 42 is cut and removed by the incomplete thread removing cutting edge 34. Subsequently, the coupling tool 10 is rotated around the axis by one rotation and a half revolution around the center of the pilot hole 40 as shown by the arrow d while being rotated around the axis. .5 pitch upwards. The revolving direction of the coupling tool 10 is a counterclockwise direction when viewed from above, and as shown in FIG. 4D, the thread of the multi-threaded cutting blade 28 is formed on the inner peripheral surface of the prepared hole 40. A right-handed female screw 44 having a pitch equal to the pitch of the right-hand thread is formed. Further, the cutting edge 34 for removing incomplete ridges forms a cylindrical surface 46 having substantially the same inner diameter as the root diameter of the female screw 44 in a part of the chamfer 42, and the lower end opening of the female screw 44, that is, the opening on the outlet side. Is chamfered by the chamfering blade 32. Since the incompletely thread-removing cutting edge 34 and the chamfering blade 32 forming the cylindrical surface 46 and the chamfering 48 are all connected to the top of the multi-threaded screw cutting blade 28, they are formed by the multi-threaded screw cutting blade 28. The formation of incomplete threads at both ends of the female screw 44 is prevented.
【0021】その後、結合工具10は矢印eで示されて
いるように雌ねじ44の中心へ移動させられるととも
に、軸心まわりの回転を停止させられる。図5の(e)
はこの状態である。また、矢印fで示されているように
初期位置まで上昇させられ、これにより一連の雌ねじ加
工を終了する。図5の(f)はこの状態である。Thereafter, the coupling tool 10 is moved to the center of the female screw 44 as shown by the arrow e, and the rotation about the axis is stopped. (E) of FIG.
Is in this state. Further, as shown by the arrow f, it is raised to the initial position, whereby a series of internal thread processing is completed. FIG. 5F shows this state.
【0022】ここで、かかる本実施例の結合工具10
は、多山ねじ切り刃28の外径d2 が穿孔刃20の外径
d1 の90%以下であるため、加工すべき雌ねじ44の
谷径に対する多山ねじ切り刃28の外径の割合が小さく
なり、例えば雌ねじ44の内径が谷径の95%程度の場
合には、多山ねじ切り刃28の外径は雌ねじ谷径の85
%程度以下となり、雌ねじ44の内径が谷径の85%程
度の場合には、多山ねじ切り刃28の外径は雌ねじ谷径
の76%程度以下となる。これにより、干渉切削量が少
なくなり、その干渉切削を考慮した刃形修正量も、強度
的に実用上問題のない範囲で済むようなる。Here, the coupling tool 10 of the present embodiment is described.
Since the outer diameter d 2 of Tayama threaded blade 28 is less than 90% of the outer diameter d 1 of the punching blade 20, the ratio of the outer diameter of Tayama threaded blade 28 against the root diameter of the internal thread 44 to be processed is small For example, when the inner diameter of the female screw 44 is about 95% of the root diameter, the outer diameter of the multi-threaded cutting blade 28 is 85% of the female screw root diameter.
% Or less, and when the inner diameter of the female screw 44 is about 85% of the root diameter, the outer diameter of the multi-threaded cutting blade 28 is about 76% or less of the female thread root diameter. As a result, the amount of interference cutting is reduced, and the amount of correction of the blade shape in consideration of the interference cutting can be within a range in which there is no practical problem in terms of strength.
【0023】上記穿孔刃20の外径d1 に対する多山ね
じ切り刃28の外径d2 の割合を小さくする程干渉切削
量は少なくなるが、それに伴って工具のたわみ剛性や捩
り強度、抗折力、切屑排出性が悪くなる。これに対し、
本実施例の結合工具10は、上記多山ねじ切り刃28の
外径d2 が穿孔刃20の外径d1 の70%以上の範囲で
設定されているため、上記たわみ剛性や捩り強度、抗折
力、切屑排出性についても実用上問題のない範囲に維持
される。The smaller the ratio of the outer diameter d 2 of the multi-threaded screw cutting blade 28 to the outer diameter d 1 of the perforating blade 20 is, the smaller the amount of interference cutting is, but the bending rigidity, torsional strength and bending resistance of the tool are accordingly reduced. The force and the chip discharge performance deteriorate. In contrast,
Binding tool 10 of this embodiment, since the outer diameter d 2 of the Tayama threaded blade 28 is set at 70% or more ranges of the outer diameter d 1 of the punching blade 20, the flexural rigidity and torsional strength, anti The bending force and the chip dischargeability are also maintained within practically acceptable ranges.
【0024】図6の斜線部は、穿孔刃20の外径d1 に
対する多山ねじ切り刃28の外径d2 の割合が70〜9
0%の範囲で定められた本実施例の結合工具10におい
て、雌ねじ44の谷径に対する多山ねじ切り刃28の外
径d2 の割合の範囲を示したもので、実線は雌ねじ44
の内径が谷径の95%の場合で一点鎖線は雌ねじ44の
内径が谷径の85%の場合である。また、この図6は、
穿孔刃20の外径d1が雌ねじ44の内径と同じ場合で
ある。 The hatched portion in FIG. 6 indicates that the ratio of the outer diameter d 2 of the multi-threaded screw cutting blade 28 to the outer diameter d 1 of the drilling blade 20 is 70 to 9.
In binding tool 10 of the present embodiment defined in the range of 0%, shows the range of the ratio of the outer diameter d 2 of Tayama threaded blade 28 against the root diameter of the internal thread 44, the solid line internal thread 44
Is 95% of the root diameter, and the alternate long and short dash line indicates that the inner diameter of the female screw 44 is 85% of the root diameter. Also, FIG.
When the outer diameter d 1 of the drilling blade 20 is the same as the inner diameter of the female screw 44,
is there.
【0025】一方、本実施例の結合工具10は、上記多
山ねじ切り刃28よりも工具軸方向の後部側に、最大径
が前記穿孔刃20の外径d1 より大きい面取り刃36が
設けられ、図4の(a)に示されているように、穿孔刃
20による下穴40の切削加工に連続してその上端開口
部に面取り42を施すようになっているため、面取り用
の専用工具を用いる場合に比較して加工設備や加工時間
が節減される。On the other hand, the coupling tool 10 of this embodiment is provided with a chamfering blade 36 whose maximum diameter is larger than the outer diameter d 1 of the drilling blade 20 at the rear side of the multi-thread screw cutting blade 28 in the tool axis direction. As shown in FIG. 4A, a chamfer 42 is formed in the opening at the upper end of the pilot hole 40 by cutting the pilot hole 40 by the drilling blade 20, so that a dedicated tool for chamfering is used. Processing equipment and processing time can be saved as compared with the case of using.
【0026】また、前記多山ねじ切り刃28の工具軸方
向における前端には、穿孔刃20に向かうに従って大径
となる面取り刃32がそれ等の多山ねじ切り刃28およ
び穿孔刃20に連続して設けられ、図4の(d)に示さ
れているように、多山ねじ切り刃28により雌ねじ44
を切削加工する際に雌ねじ44の下端開口部に面取り4
8を施すようになっているため、面取り用の専用工具を
用いる場合に比較して加工設備や加工時間が節減され
る。また、その面取り48によって下端開口部の不完全
ねじ山が面取りされるため、そのような不完全ねじ山の
変形や損傷に起因する雌ねじ44の寿命低下が防止され
る。At the front end of the multi-threaded screw cutting blade 28 in the tool axis direction, a chamfering blade 32 having a larger diameter toward the boring blade 20 is connected to the multi-threaded screw cutting blade 28 and the boring blade 20 continuously. As shown in FIG. 4D, the internal thread 44 is provided by the multi-threaded cutting blade 28.
Chamfer 4 at the lower end opening of the female screw 44 when cutting
8, the machining equipment and machining time are reduced as compared with the case where a dedicated tool for chamfering is used. Further, since the incomplete thread at the lower end opening is chamfered by the chamfer 48, the life of the female screw 44 due to the deformation or damage of the incomplete thread is prevented from being shortened.
【0027】また、前記多山ねじ切り刃28の工具軸方
向における後端には、その多山ねじ切り刃28の外径d
2 と等しい外径の不完全山削除用切れ刃34がその多山
ねじ切り刃28に連続して設けられ、図4の(c)〜
(d)に示されているように、多山ねじ切り刃28によ
り雌ねじ44を切削加工する際に前記面取り42の一部
に円筒面46を形成し、上端開口部に不完全ねじ山が形
成されることを防止しているため、そのような不完全ね
じ山の変形や損傷に起因する雌ねじ44の寿命低下が防
止される。The outer diameter d of the multi-threaded screw cutting blade 28 is provided at the rear end of the multi-threaded screw cutting blade 28 in the tool axis direction.
An incomplete mountain-removing cutting edge 34 having an outer diameter equal to 2 is provided continuously with the multi-threaded screw cutting blade 28, and FIG.
As shown in (d), when the female screw 44 is cut by the multi-threaded cutting blade 28, a cylindrical surface 46 is formed in a part of the chamfer 42, and an incomplete thread is formed in the upper end opening. Therefore, the life of the female screw 44 due to the deformation or damage of the incomplete thread is prevented from being shortened.
【0028】また、前記多山ねじ切り刃28の工具軸方
向における長さ寸法Lは、被加工物30の肉厚よりも
0.5ピッチ程度だけ短い寸法に定められており、図4
の(c)に示されているように、不完全山削除用切れ刃
34が略1ピッチ分だけ下穴40内に入り込むととも
に、多山ねじ切り刃28の先端部が略0.5ピッチ分だ
け下穴40から下方へ突き出す状態から、図4の(d)
に示されているように、上方へ1.5ピッチ移動させら
れつつ下穴40の周方向へ1.5回転公転させられるこ
とにより、雌ねじ44を切削加工するようになっている
ため、その切削加工時に、不完全山削除用切れ刃34に
よって前記円筒面46が切削加工されるとともに、面取
り刃32によって面取り48が施される。したがって、
これ等の円筒面46や面取り48を別工程で加工する場
合に比較して加工時間が短縮される。The length L of the multi-threaded cutting blade 28 in the tool axis direction is set to a dimension shorter than the thickness of the workpiece 30 by about 0.5 pitch.
As shown in (c), the cutting edge 34 for removing incomplete ridges enters the prepared hole 40 by approximately one pitch, and the tip of the multi-threaded screw cutting blade 28 becomes approximately 0.5 pitches. FIG. 4D shows a state in which the hole projects downward from the pilot hole 40.
As shown in FIG. 2, the female screw 44 is cut by being revolved 1.5 revolutions in the circumferential direction of the pilot hole 40 while being moved upward by 1.5 pitches. At the time of machining, the cylindrical surface 46 is cut by the incomplete mountain removing cutting blade 34, and the chamfer 48 is chamfered by the chamfering blade 32. Therefore,
The processing time is shortened as compared with the case where these cylindrical surfaces 46 and chamfers 48 are processed in a separate process.
【0029】また、前記多山ねじ切り刃28および穿孔
刃20は共通のランド18に設けられているため、多山
ねじ切り刃28の再研削をそのすくい面、すなわちねじ
れ溝16を研削加工して行うと、穿孔刃20の外周刃2
4のすくい面にも研削加工が施されてランド18を狭く
する方向へ外周刃24が後退させられるが、その外周刃
24にはマージン26が設けられているため、ランド1
8を狭くする方向へ外周刃24が後退しても、その外径
d1 は一定に維持される。これにより、多山ねじ切り刃
28の再研削に拘らず、常に一定の径寸法の下穴40が
切削加工される。Further, since the multi-threaded screw cutting blade 28 and the drilling blade 20 are provided on the common land 18, re-grinding of the multi-threaded screw cutting blade 28 is performed by grinding the rake face, that is, the twist groove 16. And the outer peripheral blade 2 of the boring blade 20
The rake face of No. 4 is also ground, and the outer peripheral blade 24 is retracted in a direction to narrow the land 18. However, since the outer peripheral blade 24 is provided with a margin 26,
Be peripheral cutting edge 24 in the direction to narrow the 8 retracts, the outer diameter d 1 is kept constant. Thereby, the prepared hole 40 having a constant diameter is always cut regardless of the re-grinding of the multi-threaded screw cutting blade 28.
【0030】以上、本考案の一実施例を図面に基づいて
詳細に説明したが、本考案は他の態様で実施することも
できる。While one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in other forms.
【0031】例えば、前記実施例では結合工具10を上
側から見て左まわりに公転させつつ軸方向の上方へ移動
させて右ねじの雌ねじ44を切削加工する場合について
説明したが、この公転方向や軸方向における送り方向は
適宜変更できる。For example, in the above-described embodiment, the case where the coupling tool 10 is revolved counterclockwise as viewed from above and moved upward in the axial direction to cut the right-handed female screw 44 has been described. The feed direction in the axial direction can be appropriately changed.
【0032】また、前記実施例では一対のねじれ溝16
が設けられていたが、このねじれ溝の数は適宜変更でき
るし、軸心と平行な直溝が設けられても良い。多山ねじ
切り刃28の刃数と穿孔刃20の刃数は必ずしも同じで
ある必要はない。In the above embodiment, the pair of twist grooves 16
However, the number of the twist grooves can be changed as appropriate, and a straight groove parallel to the axis may be provided. The number of blades of the multi-threaded screw cutting blade 28 and the number of blades of the perforation blade 20 need not necessarily be the same.
【0033】また、前記実施例の結合工具10は面取り
刃32,36や不完全山削除用切れ刃34を備えていた
が、それ等は必要に応じて適宜設けられれば良い。多山
ねじ切り刃28の長さ寸法Lについても適宜設定でき
る。Although the coupling tool 10 of the embodiment has the chamfering blades 32 and 36 and the cutting edge 34 for removing incomplete ridges, these may be appropriately provided as needed. The length L of the multi-threaded cutting blade 28 can also be set as appropriate.
【0034】その他一々例示はしないが、本考案は当業
者の知識に基づいて種々の変更,改良を加えた態様で実
施することができる。Although not specifically exemplified, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.
【図1】本考案の一実施例である通り穴用穿孔ねじ切り
結合工具の正面図である。FIG. 1 is a front view of a threaded connection tool for drilling a hole as one embodiment of the present invention.
【図2】図1の実施例の底面図である。FIG. 2 is a bottom view of the embodiment of FIG.
【図3】図1の工具を用いて雌ねじ加工を行う際に被加
工物に対して初期位置に位置させられた状態を示す図で
ある。FIG. 3 is a view showing a state in which the workpiece is positioned at an initial position with respect to a workpiece when performing internal thread machining using the tool of FIG. 1;
【図4】図5と共に、図1の工具を用いて雌ねじ加工を
行う際の各工程を示す図である。FIG. 4 is a view showing the respective steps when performing internal thread machining using the tool of FIG. 1 together with FIG. 5;
【図5】図4と共に、図1の工具を用いて雌ねじ加工を
行う際の各工程を示す図である。5 is a diagram showing the respective steps when performing internal thread machining using the tool of FIG. 1 together with FIG. 4;
【図6】図1の工具において雌ねじ谷径に対する多山ね
じ切り刃の外径の割合を示す図である。FIG. 6 is a view showing a ratio of an outer diameter of a multi-threaded screw cutting blade to a female screw root diameter in the tool of FIG. 1;
【図7】多山ねじ切り刃の外径の違いが干渉切削に与え
る影響を説明する図で、(a)は穿孔刃の外径の100
%の場合であり、(b)は90%の場合である。FIGS. 7A and 7B are diagrams for explaining the influence of the difference in the outer diameter of the multi-threaded cutting blade on the interference cutting, and FIG.
%, And (b) is a case of 90%.
10:通り穴用穿孔ねじ切り結合工具 18:ランド 20:穿孔刃 26:マージン 28:多山ねじ切り刃 30:被加工物 32:面取り刃(第2面取り刃) 34:不完全山削除用切れ刃 36:面取り刃(第1面取り刃) 40:下穴 44:雌ねじ d1 :穿孔刃の外径 d2 :多山ねじ切り刃の外径10: Through-hole drilling thread cutting tool 18: Land 20: Drilling blade 26: Margin 28: Multi-thread thread cutting blade 30: Workpiece 32: Chamfering blade (second chamfering blade) 34: Cutting edge for incomplete mountain removal 36 : chamfering blade (first chamfered edge) 40: pilot hole 44: female thread d 1: the outside diameter of the cutting head d 2: Tayama outer diameter of the threaded blade
フロントページの続き (58)調査した分野(Int.Cl.6,DB名) B23G 5/06 Continuation of front page (58) Field surveyed (Int.Cl. 6 , DB name) B23G 5/06
Claims (3)
に有するとともに、該穿孔刃によって形成された下穴に
雌ねじを切削加工するリードの無い多山ねじ切り刃が該
穿孔刃よりも軸方向後部側に一体に設けられ、軸心まわ
りに回転駆動されつつ被加工物に対して軸方向へ相対移
動させられることにより前記穿孔刃によって該穿孔刃の
径寸法と略等しい径寸法で被加工物を貫通する下穴を加
工した後に、軸心まわりに回転駆動されつつ該下穴内を
軸方向および周方向へ相対移動させられることにより前
記多山ねじ切り刃によって該下穴の内周面に内径が下穴
径と略等しい雌ねじを切削加工する、通り穴用の穿孔ね
じ切り結合工具において、 前記多山ねじ切り刃の外径を前記穿孔刃の外径の90%
以下とし、 前記多山ねじ切り刃の工具軸方向における前端に、最大
径が該多山ねじ切り刃の外径より大きくて該多山ねじ切
り刃により雌ねじを切削加工する際に前記下穴の開口部
に面取りを行う第2面取り刃を該多山ねじ切り刃の頂部
に連続して設けた ことを特徴とする通り穴用穿孔ねじ切
り結合工具。1. A multi-thread screw cutting blade having a lead hole for cutting a pilot hole at an axially front end portion and having no lead for cutting a female screw into a pilot hole formed by the drill hole. The drilling blade is integrally provided on the rear side in the axial direction, and is relatively rotated in the axial direction with respect to the workpiece while being rotated about the axis, so that the drilling blade has a diameter substantially equal to the diameter of the drilling blade. After machining a pilot hole that penetrates the workpiece, the multi-threaded screw cutting blade moves the pilot hole relative to the inner peripheral surface of the pilot hole by being relatively rotated in the axial direction and the circumferential direction while being rotated around the axis. In a boring thread cutting and coupling tool for a through hole, which cuts an internal thread having an inner diameter substantially equal to a prepared hole diameter, the outer diameter of the multi-threaded cutting blade is 90% of the outer diameter of the drilling blade.
In the following, at the front end of the multi-threaded cutting edge in the tool axis direction, a maximum
The diameter is larger than the outer diameter of the multi-thread
When cutting the internal thread with a cutting blade, the opening of the pilot hole
A second chamfering blade for chamfering the top of the multi-threaded cutting blade
Drilling threading coupling tool through hole, characterized in that provided in succession.
前端および後端の少なくとも一方に、該多山ねじ切り刃
の外径と略等しい外径の不完全山削除用切れ刃が該多山
ねじ切り刃の頂部に連続して設けられていることを特徴
とする請求項1に記載の通り穴用穿孔ねじ切り結合工
具。2. The multi-thread screw cutting blade is provided at at least one of a front end and a rear end of the multi-thread screw cutting blade with an outer diameter substantially equal to the outer diameter of the multi-thread screw cutting blade. 2. The tool according to claim 1 , wherein the tool is provided continuously with the top of the blade.
長さ寸法は、雌ねじを加工すべき前記被加工物の肉厚と
略同じ寸法である請求項1または2に記載の通り穴用穿
孔ねじ切り結合工具。Length in the tool axis direction wherein the Tayama threaded blade, drilling through hole according to claim 1 or 2 wall thickness of the workpiece to be machined internal threads to be substantially the same size Thread connection tool.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1992055530U JP2601117Y2 (en) | 1992-07-15 | 1992-07-15 | Drilling threaded connection tool for through holes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1992055530U JP2601117Y2 (en) | 1992-07-15 | 1992-07-15 | Drilling threaded connection tool for through holes |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0611923U JPH0611923U (en) | 1994-02-15 |
JP2601117Y2 true JP2601117Y2 (en) | 1999-11-08 |
Family
ID=13001292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1992055530U Expired - Lifetime JP2601117Y2 (en) | 1992-07-15 | 1992-07-15 | Drilling threaded connection tool for through holes |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2601117Y2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4526048B2 (en) * | 1999-07-09 | 2010-08-18 | 株式会社不二越 | Threading tool |
JP2005230933A (en) * | 2004-02-17 | 2005-09-02 | Aisin Seiki Co Ltd | Threaded hole machining tool |
WO2007063578A1 (en) * | 2005-11-29 | 2007-06-07 | Osg Corporation | Screw thread cutter |
DE102011001772A1 (en) * | 2010-12-14 | 2012-06-14 | EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge | Thread forming tool for producing a thread in a workpiece |
DE102012105183B4 (en) * | 2012-06-14 | 2013-12-24 | Audi Ag | Method and a tool each for generating a thread in a workpiece |
CN109676181A (en) * | 2019-02-25 | 2019-04-26 | 汇专绿色工具有限公司 | A kind of cutting tool and its cutting edge portion with Dual-head chamfering function |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS619219U (en) * | 1984-06-19 | 1986-01-20 | 株式会社日立国際電気 | Chamfering and female thread processing tool |
SE456408B (en) * | 1987-02-10 | 1988-10-03 | Sandvik Ab | DRILLING AND GEAR TOOLS |
JPH0525782Y2 (en) * | 1988-03-01 | 1993-06-29 | ||
DE3939795A1 (en) * | 1989-12-01 | 1991-06-06 | Schmitt M Norbert Dipl Kaufm D | METHOD FOR PRODUCING A THREADED HOLE |
-
1992
- 1992-07-15 JP JP1992055530U patent/JP2601117Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0611923U (en) | 1994-02-15 |
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