JP3740503B2 - Thread cutting tool - Google Patents

Thread cutting tool Download PDF

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Publication number
JP3740503B2
JP3740503B2 JP03666096A JP3666096A JP3740503B2 JP 3740503 B2 JP3740503 B2 JP 3740503B2 JP 03666096 A JP03666096 A JP 03666096A JP 3666096 A JP3666096 A JP 3666096A JP 3740503 B2 JP3740503 B2 JP 3740503B2
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JP
Japan
Prior art keywords
blade
thread
rough
finishing
cutting
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JP03666096A
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Japanese (ja)
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JPH09225743A (en
Inventor
信文 小木曽
可薫 山田
和彦 松岡
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Tungaloy Corp
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Tungaloy Corp
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Description

【０００１】
【発明の属する技術分野】
この発明は、穴加工しながらその内周面にネジを切削できるネジ切り工具に関する。
【０００２】
【従来の技術】
ネジ切り工具としては、例えば実開昭６４−５２６２０号公報、特開平３−１８４７２１号公報および特開平３−１８４７２２号公報等で知られている。
実開昭６４−５２６２０号公報は、工具本体の先端部における側部にネジ切り用チップを設け、このネジ切り用チップに凹凸をなす波形形状の切り刃を設けると共に、先端側の切り刃を荒刃に、他を仕上げ刃に形成し、切削に伴って荒刃によって切削されたネジ山が仕上げ刃によって完全山に仕上げられるようにしたものである。
【０００３】
特開平３−１８４７２１号公報および特開平３−１８４７２２号公報は、工具本体の先端部における底部に底刃を設けるとともに、側部にネジ切り刃を設け、工具本体を自転させながら軸方向にヘリカル送りを行うことにより、底刃によって穴加工しながらその穴の内周面にネジを切削できるようにしたものである。
【０００４】
【発明が解決しようとする課題】
しかしながら、実開昭６４−５２６２０号公報のものは、被加工物にドリルによって下穴を開ける必要があり、タップに比べて加工時間が長くかかり、さらに切り屑の排出性が悪い。また、特開平３−１８４７２１号公報および特開平３−１８４７２２号公報は、穴加工しながらその穴の内周面にネジを切削できるが、底刃の角部が直角もしくは鋭角に形成されている。角部の角度が鋭角になるほど機械的強度が小さくなるため、穴加工時に、角部での欠損が生じやすい。さらに、ネジ切り刃に荒刃がないため、タップ加工時の切削抵抗が大きく、ネジ精度が悪いという問題がある。
【０００５】
この発明は、前記事情に着目してなされたもので、その目的とするところは、穴加工しながらその穴の内周面にネジを切削でき、しかも切削抵抗が小さく、切り屑の排出性が良く、ネジ精度の高い加工ができるネジ切り工具を提供することにある。
【０００６】
【課題を解決するための手段】
この発明は、前述した目的を達成するために、請求項1は、工具本体の先端部における側部にネジ山形状のネジ切り刃を設けたネジ切り工具において、前記ネジ切り刃は、先端側の少なくとも１つが荒刃で、他は仕上げ刃であり、当該荒刃は、前記仕上げ刃より高さが低く形成され、当該荒刃のネジ山の角度θ 2 は、前記仕上げ刃のネジ山の角度θ 1 と等しくもしくは大きくして、当該荒刃と前記仕上げ刃とを重ねたときに、当該荒刃が前記仕上げ刃に含まれるようにし、前記工具本体の先端部における底部に凹部を形成するとともに、この凹部に底刃を設け、前記凹部の裾部に、内周部では前記底刃と９０°より大きい角度を持って連続し、外周部では前記底刃と前記ネジ切り刃との間に連続して設けられ、前記荒刃と一致する角度を持って連続する外周刃を設け、前記工具本体を自転させながら軸方向にヘリカル送りを行うことにより、前記底刃および前記外周刃の切削加工によって被加工物に下穴が開けられ、次に、前記下穴の内周面に前記荒刃によってネジ切り加工が行われ、さらに、前記荒刃によって切削されたネジ切り跡を前記仕上げ刃によって切削し、完全ネジ山が加工されるようにしたことを特徴とする。
【０００７】
請求項２は、工具本体の先端部における側部にネジ山形状のネジ切り刃を設けたネジ切り工具において、前記ネジ切り刃は、先端側の少なくとも１つが荒刃で、他は仕上げ刃であり、前記荒刃は、仕上げ刃より高さが低く形成され、当該荒刃のネジ山の角度θ 2 は、前記仕上げ刃のネジ山の角度θ 1 と等しくもしくは大きくして、当該荒刃と前記仕上げ刃とを重ねたときに、当該荒刃が前記仕上げ刃に含まれるようにし、前記工具本体の先端部における底部に工具本体の軸心部を頂点とする山形状凹部を形成するとともに、この山形状凹部の斜面に底刃を設け、前記山形状凹部の裾部に、内周部では前記底刃と９０°より大きい角度を持って連続し、外周部では前記底刃と前記ネジ切り刃との間に連続して設けられ、前記荒刃と一致する角度を持って連続する外周刃を設け、前記工具本体を自転させながら軸方向にヘリカル送りを行うことにより、前記底刃および前記外周刃の切削加工によって被加工物に下穴が開けられ、次に、前記下穴の内周面に前記荒刃によってネジ切り加工が行われ、さらに、前記荒刃によって切削されたネジ切り跡を前記仕上げ刃によって切削し、完全ネジ山が加工されるようにしたことを特徴とする。
【０００９】
工具本体を自転させながら軸方向にヘリカル送り（１回転で１ピッチ送り）を行うと、まず、工具本体の先端部の底刃が被加工物に当り、底刃の切削加工によって被加工物に下穴が開けられる。次に、底刃によって開けられた下穴の外周部に底刃とネジ切り刃との間に連続して設けられた外周刃によって切削されるとともに、外周刃によって切削された切削跡をネジ切り刃によって下穴の内周面にネジ切りが行われる。
【００１０】
【発明の実施の形態】
以下、この発明の実施の形態を図面に基づいて説明する。
図１はネジ切り工具としてのネジ切りエンドミルの正面図および側面図、図２は同斜視図、図３は図１の矢印Ａ方向から見た矢視図、図４は図１のＢ部を拡大した正面図、図５はネジ切りエンドミルによる加工状態の説明図である。
【００１１】
図中１はエンドミル本体を示し、このエンドミル本体１の中心部には軸方向にエア、クーラント穴２が貫通して設けられている。エンドミル本体１の先端部における側部にはエンドミル本体１の軸心を挟んで対称的に２枚のネジ切り刃３が一体に設けられ、これらネジ切り刃３，３間におけるエンドミル本体１の側部は略Ｖ字状に切欠され、切欠によって切り屑排出部４が設けられている。
【００１２】
前記ネジ切り刃３はネジ山形状で、先端側の１つは荒刃３ａに、残りの２つは完全刃の仕上げ刃３ｂ，３ｃに形成されている。さらに、荒刃３ａの山の高さは、仕上げ刃３ｂ，３ｃの山より低く形成されている。
【００１３】
すなわち、図４に示す、Ｐはネジ切り刃３のネジ山ピッチであり、θ1 は仕上げ刃３ｂ，３ｃのネジ山の角度で、θ2 は荒刃３ａのネジ山の角度であり、θ1 とθ2 との関係は、θ2 がθ1 より小さくならないようにして、荒刃３ａと仕上げ刃３ｂ，３ｃとを重ねたときに、荒刃３ａが仕上げ刃３ｂ，３ｃに含まれるようにする。また、仕上げ刃３ｂ，３ｃのネジ山の高さをｈ1 、荒刃３ａのネジ山の高さをｈ2 とすると、ｈ1 とｈ2 との関係は、ｈ1 ＞ｈ2 になっている。
【００１４】
さらに、エンドミル本体１の先端部における底部にはエンドミル本体１の軸心部を頂点とする広角の山形状凹部５が形成されている。この山形状凹部５の斜面の角度αはネジのリード角より大きく形成され、その斜面には一定幅のすくい面６ａを有する底刃６が設けられている。したがって、底刃６はエンドミル本体１の軸心を中心として点対称的に設けられている。また、山形状凹部５の裾部、つまりエンドミル本体１の底部外周部には外周刃７が設けられている。この外周刃７の内周部７ａは前記底刃６と鈍角の角度を持って連続し、外周部７ｂでは前記ネジ切り刃３の荒刃３ａと一致する角度を持って連続している。
【００１５】
次に、前述のように構成されたネジ切りエンドミルの作用について説明する。図５に示すように、被加工物Ｗを固定し、エンドミル本体１の基端部を切削機械の主軸に装着する。そして、エンドミル本体１を自転させながら軸方向にヘリカル送り（１回転で１ピッチ送り）を行うと、まず、エンドミル本体１の先端部の底刃６と外周刃７との角部が被加工物Ｗに当り、次に、底刃６および外周刃７の切削加工によって被加工物Ｗに下穴８が開けられる。
【００１６】
このとき、底刃６は、エンドミル本体１の先端部における底部に山形状凹部５が形成され、その斜面に設けられているため、底刃６の全幅が同時に被加工物Ｗに接触することはなく、片側の一部が接触し、他の部分は接触しない。一方、外周刃７は、エンドミル本体１の軸心を挟む反対側で被加工物Ｗと接触し、他方では接触しない。このため、底部における接触長さが短くなって切削抵抗が小さくなると共に、切り屑は切り屑は１つに分断された状態で切り屑排出部４に沿って上昇するので切り屑排出が改善される。
【００１７】
次に、底刃６および外周刃７によって開けられた下穴８の内周面に外周刃７に連続して設けられたネジ切り刃３の荒刃３ａによってネジ切りが行われる。さらに、エンドミル本体１のヘリカル送りが進むと、荒刃３ａによって切削されたネジ切り跡を仕上げ刃３ｂ，３ｃによって切削し、完全ネジ山９が加工される。
【００１８】
このようにネジ切り刃３の荒刃３ａによって下穴８の内周面にネジ切りを行った後、そのネジ切り跡を仕上げ刃３ｂ，３ｃによって切削することにより、切削されるネジのピッチ誤差がなくなり、ネジ精度の高い加工ができ、また仕上げ刃３ｂ，３ｃの実質切込み量が少なくなることから切削抵抗が少なく、円滑に切削加工できる。
【００１９】
なお、前記一実施例においては、エンドミル本体１の軸心を挟んで対称的に２枚のネジ切り刃３を設けたが、周方向に等間隔であれば、３枚、４枚としてもよく、また、ネジ切り刃３を１つの荒刃３ａと２つの仕上げ刃３ｂ，３ｃを設けたが、その個数も前記実施例に限定されるものではない。
【００２０】
【発明の効果】
この発明によれば、工具本体の先端部における側部にネジ切り刃を設け、底部に凹部を形成するとともに底刃を設け、さらに凹部の裾部に、内周部では前記底刃と９０゜より大きい角度を持って連続し、外周部では前記ネジ切り刃と一致する角度を持って連続する外周刃を設けたことを特徴とする。
【００２１】
したがって、被加工物に穴加工しながらその穴の内周面にネジを切削でき、しかも底部の切刃の接触長が短いために切削抵抗が小さく、また切り屑が分断されて切り屑の排出性が向上するという効果がある。また、ネジ切り刃は、先端側の少なくとも１つが荒刃で、他は仕上げ刃にすることにより、仕上げ刃の実質切込み量が少なくなることから切削抵抗が少なく、円滑にネジ精度の高い加工ができるという効果がある。
【図面の簡単な説明】
【図１】この発明の実施の形態を示すネジ切りエンドミルの正面図および側面図。
【図２】同実施形態のネジ切りエンドミルの斜視図。
【図３】図１の矢印Ａ方向から見た矢視図。
【図４】図１のＢ部を拡大した正面図。
【図５】同実施形態のネジ切りエンドミルの加工状態の説明図。
【符号の説明】
１…エンドミル本体
３…ネジ切り刃
３ａ…荒刃
３ｂ，３ｃ…仕上げ刃
５…山形状凹部
６…底刃
７…外周刃。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thread cutting tool capable of cutting a screw on its inner peripheral surface while drilling.
[0002]
[Prior art]
As threading tools, for example, Japanese Utility Model Laid-Open Nos. 64-52620, 3-184721, and 3-184722 are known.
In Japanese Utility Model Laid-Open No. 64-52620, a thread cutting tip is provided on the side of the tip of the tool body, and a corrugated cutting blade is formed on the thread cutting tip. Others are formed on the rough blade and others on the finished blade, and the thread cut by the rough blade along with the cutting is finished to a complete thread by the finishing blade.
[0003]
Japanese Patent Application Laid-Open Nos. 3-184721 and 3-184722 are provided with a bottom blade at the bottom of the tip of the tool body, a thread cutting blade at the side, and helically rotating in the axial direction while rotating the tool body. By feeding, a screw can be cut on the inner peripheral surface of the hole while drilling with a bottom blade.
[0004]
[Problems to be solved by the invention]
However, in Japanese Utility Model Publication No. 64-52620, it is necessary to make a pilot hole in a workpiece by a drill, and it takes a longer time to process than a tap, and chip discharge is poor. Japanese Patent Laid-Open No. 3-184721 and Japanese Patent Laid-Open No. 3-184722 can cut a screw on the inner peripheral surface of a hole while drilling, but the corner portion of the bottom blade is formed at a right angle or an acute angle. . Since the mechanical strength decreases as the angle of the corner becomes sharper, defects at the corner tend to occur during drilling. Furthermore, since there is no rough blade in the thread cutting blade, there is a problem that the cutting resistance during tapping is large and the screw accuracy is poor.
[0005]
The present invention has been made by paying attention to the above circumstances. The purpose of the present invention is to be able to cut a screw on the inner peripheral surface of the hole while drilling, and to reduce cutting resistance and chip discharge. It is desirable to provide a threading tool that can perform processing with high screw accuracy.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a threading tool in which a thread-shaped threading blade is provided on a side portion at a distal end portion of a tool body, wherein the threading blade is disposed at a distal end side. At least one of them is a rough blade and the other is a finishing blade, and the rough blade is formed with a height lower than that of the finishing blade, and the angle θ 2 of the thread of the rough blade is equal to that of the thread of the finishing blade. When the rough blade and the finishing blade are overlapped with each other with an angle θ 1 equal to or larger than the angle θ 1 , the rough blade is included in the finishing blade, and a recess is formed at the bottom of the tip of the tool body. together, the end cutting edge is provided in the recess, the skirt portion of the recess, the inner peripheral portion continuous with the bottom blade and the angle is greater than 90 °, between the end cutting edge and the threaded blade at the outer peripheral portion continuously provided, communicating with an angle matching the Araha The peripheral cutting edge of providing, by performing a helical feed axially while rotating the tool body, the prepared hole is opened in the workpiece by cutting of the end cutting edge and the peripheral cutting edge, then the prepared hole The inner peripheral surface is threaded by the rough blade, and further, the thread cutting trace cut by the rough blade is cut by the finishing blade so that a complete thread is processed. To do.
[0007]
According to a second aspect of the present invention, in the thread cutting tool in which the thread-shaped thread cutting blade is provided on the side portion at the tip portion of the tool body, at least one of the thread cutting blades is a rough blade and the other is a finishing blade. The rough blade is formed lower in height than the finishing blade, and the angle θ 2 of the thread of the rough blade is equal to or larger than the angle θ 1 of the thread of the finishing blade, When the finishing blade is overlaid, the rough blade is included in the finishing blade, and the bottom of the tip of the tool body is formed with a mountain-shaped recess having the axis of the tool body as a vertex, A bottom blade is provided on the slope of the mountain-shaped recess, and the bottom edge of the mountain-shaped recess is continuous with the bottom blade at an angle greater than 90 ° at the inner periphery, and the bottom blade and the threaded cutting at the outer periphery. It is provided continuously between the blades and has an angle that matches the rough blades. By providing a continuous outer peripheral blade and performing helical feeding in the axial direction while rotating the tool body, a pilot hole is opened in the workpiece by cutting the bottom blade and the outer peripheral blade, thread cutting process is performed by the rough edge on the inner peripheral surface of the prepared hole, further, the threaded after being cut by the rough cutting is cut by the finishing edges, that a complete thread has to be processed It is characterized by.
[0009]
When helical feed (1 pitch feed per rotation) is performed in the axial direction while rotating the tool body, the bottom blade at the tip of the tool body first hits the workpiece, and the workpiece is cut by the bottom blade. A pilot hole can be drilled. Next, the outer peripheral edge of the prepared hole opened by the bottom blade is cut by the outer peripheral blade continuously provided between the bottom blade and the thread cutting blade, and the cutting trace cut by the outer peripheral blade is threaded. Threading is performed on the inner peripheral surface of the pilot hole by the blade.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a front view and a side view of a threading end mill as a threading tool, FIG. 2 is a perspective view thereof, FIG. 3 is an arrow view seen from the direction of arrow A in FIG. 1, and FIG. An enlarged front view, FIG. 5 is an explanatory view of a machining state by a threaded end mill.
[0011]
In the figure, reference numeral 1 denotes an end mill main body, and air and coolant holes 2 are provided through the central portion of the end mill main body 1 in the axial direction. Two screw cutting blades 3 are integrally provided symmetrically on the side portion at the tip of the end mill main body 1 with the axis of the end mill main body 1 interposed therebetween, and the end mill main body 1 side between the screw cutting blades 3 and 3 is provided. The part is cut out in a substantially V shape, and a chip discharge part 4 is provided by the cutout.
[0012]
The thread cutting blade 3 has a thread shape, one on the tip side is formed on the rough blade 3a, and the other two are formed on the finishing blades 3b and 3c which are complete blades. Furthermore, the peak height of the rough blade 3a is formed lower than the peaks of the finishing blades 3b and 3c.
[0013]
4, P is the thread pitch of the thread cutting blade 3, θ 1 is the thread angle of the finishing blades 3b and 3c, θ 2 is the thread angle of the rough blade 3a, and θ The relationship between 1 and θ 2 is that when the rough blade 3a and the finishing blades 3b and 3c are stacked so that θ 2 does not become smaller than θ 1 , the rough blade 3a is included in the finishing blades 3b and 3c. To. Also, finishing edges 3b, h 1 the height of the thread of 3c, and the height of the thread of Araha 3a and h 2, the relationship between h 1 and h 2 are taken h 1> h 2 Yes.
[0014]
Furthermore, a wide-angle mountain-shaped recess 5 having the axial center of the end mill main body 1 as a vertex is formed at the bottom of the end portion of the end mill main body 1. The angle α of the slope of the mountain-shaped recess 5 is formed larger than the lead angle of the screw, and a bottom blade 6 having a rake face 6a having a constant width is provided on the slope. Therefore, the bottom blade 6 is provided point-symmetrically about the axis of the end mill body 1. In addition, an outer peripheral blade 7 is provided at the bottom of the mountain-shaped concave portion 5, that is, the bottom outer peripheral portion of the end mill body 1. The inner peripheral portion 7 a of the outer peripheral blade 7 is continuous with the bottom blade 6 with an obtuse angle, and the outer peripheral portion 7 b is continuous with an angle that coincides with the rough blade 3 a of the screw cutting blade 3.
[0015]
Next, the operation of the threading end mill configured as described above will be described. As shown in FIG. 5, the workpiece W is fixed, and the base end portion of the end mill body 1 is attached to the main shaft of the cutting machine. When the end mill body 1 is rotated in a helical manner in the axial direction (1 pitch feed per rotation), first, the corners of the bottom edge 6 and the outer peripheral edge 7 at the tip of the end mill body 1 are processed. Next, a pilot hole 8 is formed in the workpiece W by cutting the bottom blade 6 and the outer peripheral blade 7.
[0016]
At this time, the bottom blade 6 is formed with a mountain-shaped recess 5 at the bottom of the end portion of the end mill main body 1 and provided on the slope thereof, so that the entire width of the bottom blade 6 is in contact with the workpiece W at the same time. No part of one side is in contact with the other part. On the other hand, the outer peripheral blade 7 contacts the workpiece W on the opposite side across the axis of the end mill body 1 and does not contact the other. For this reason, the contact length at the bottom is shortened, cutting resistance is reduced, and the chips rise along the chip discharge portion 4 in a state where the chips are divided into one, so that chip discharge is improved. The
[0017]
Next, threading is performed by the rough blade 3 a of the thread cutting blade 3 provided continuously to the outer peripheral blade 7 on the inner peripheral surface of the prepared hole 8 opened by the bottom blade 6 and the outer peripheral blade 7. Further, when the helical feed of the end mill body 1 proceeds, the thread cut trace cut by the rough blade 3a is cut by the finishing blades 3b and 3c, and the complete thread 9 is processed.
[0018]
After threading the inner peripheral surface of the pilot hole 8 with the rough blade 3a of the thread cutting blade 3 in this way, the thread cutting trace is cut with the finishing blades 3b and 3c, thereby causing a pitch error of the screw to be cut. Therefore, machining with high screw accuracy can be performed, and the cutting depth of the finishing blades 3b and 3c is reduced, so that cutting resistance is low and cutting can be performed smoothly.
[0019]
In the above embodiment, the two thread cutting blades 3 are provided symmetrically with the axis of the end mill body 1 interposed therebetween. However, three or four pieces may be provided if they are equidistant in the circumferential direction. In addition, although the thread cutting blade 3 is provided with one rough blade 3a and two finishing blades 3b and 3c, the number thereof is not limited to the above embodiment.
[0020]
【The invention's effect】
According to the present invention, the thread cutting blade is provided at the side portion at the tip of the tool body, the recess is formed at the bottom and the bottom blade is provided, and the bottom blade is provided at the bottom of the recess and 90 ° at the inner periphery. An outer peripheral blade that is continuous at a larger angle and that is continuous at an angle that coincides with the thread cutting blade is provided at the outer peripheral portion.
[0021]
Therefore, it is possible to cut the screw on the inner peripheral surface of the hole while drilling the workpiece, and the contact length of the cutting edge at the bottom is short, so the cutting resistance is low, and the chips are cut off to discharge the chips. This has the effect of improving the performance. In addition, at least one of the screw cutting blades is a rough blade, and the other is a finishing blade, so that the cutting depth of the finishing blade is reduced, so that cutting resistance is low and smooth machining with high screw accuracy is possible. There is an effect that can be done.
[Brief description of the drawings]
FIG. 1 is a front view and a side view of a threaded end mill showing an embodiment of the present invention.
FIG. 2 is a perspective view of a threaded end mill according to the embodiment.
FIG. 3 is an arrow view seen from the direction of arrow A in FIG.
4 is an enlarged front view of a portion B in FIG.
FIG. 5 is an explanatory diagram of a machining state of the threaded end mill of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... End mill main body 3 ... Screw cutting blade 3a ... Rough blade 3b, 3c ... Finishing blade 5 ... Mountain-shaped recessed part 6 ... Bottom blade 7 ... Outer peripheral blade.

Claims (2)

工具本体の先端部における側部にネジ山形状のネジ切り刃を設けたネジ切り工具において、
前記ネジ切り刃は、先端側の少なくとも１つが荒刃で、他は仕上げ刃であり、
当該荒刃は、前記仕上げ刃より高さが低く形成され、
当該荒刃のネジ山の角度θ 2 は、前記仕上げ刃のネジ山の角度θ 1 と等しくもしくは大きくして、当該荒刃と前記仕上げ刃とを重ねたときに、当該荒刃が前記仕上げ刃に含まれるようにし、
前記工具本体の先端部における底部に凹部を形成するとともに、
この凹部に底刃を設け、前記凹部の裾部に、内周部では前記底刃と９０°より大きい角度を持って連続し、
外周部では前記底刃と前記ネジ切り刃との間に連続して設けられ、前記荒刃と一致する角度を持って連続する外周刃を設け、
前記工具本体を自転させながら軸方向にヘリカル送りを行うことにより、前記底刃および前記外周刃の切削加工によって被加工物に下穴が開けられ、次に、前記下穴の内周面に前記荒刃によってネジ切り加工が行われ、さらに、前記荒刃によって切削されたネジ切り跡を前記仕上げ刃によって切削し、完全ネジ山が加工されるようにしたことを特徴とするネジ切り工具。In a thread cutting tool provided with a thread-shaped thread cutting blade on the side at the tip of the tool body,
The thread cutting blade is at least one of the front end side is a rough blade, the other is a finishing blade,
The rough blade is formed lower in height than the finishing blade,
The thread angle θ 2 of the rough blade is equal to or larger than the thread angle θ 1 of the finishing blade, and when the rough blade and the finishing blade are overlapped, the rough blade becomes the finishing blade. To be included in the
While forming a recess in the bottom of the tip of the tool body,
A bottom blade is provided in the recess, and the bottom of the recess is continuous with the bottom blade at an angle greater than 90 ° at the inner periphery.
In the outer peripheral portion, provided continuously between the bottom blade and the thread cutting blade, and provided with an outer peripheral blade that has a continuous angle with the rough blade ,
By performing helical feeding in the axial direction while rotating the tool main body, a pilot hole is opened in the workpiece by cutting the bottom blade and the outer peripheral blade, and then the inner peripheral surface of the pilot hole is A thread cutting tool, wherein thread cutting is performed with a rough blade, and further, a thread cut trace cut with the rough blade is cut with the finishing blade so that a complete thread is processed . 工具本体の先端部における側部にネジ山形状のネジ切り刃を設けたネジ切り工具において、
前記ネジ切り刃は、先端側の少なくとも１つが荒刃で、他は仕上げ刃であり、
前記荒刃は、仕上げ刃より高さが低く形成され、
当該荒刃のネジ山の角度θ 2 は、前記仕上げ刃のネジ山の角度θ 1 と等しくもしくは大きくして、当該荒刃と前記仕上げ刃とを重ねたときに、当該荒刃が前記仕上げ刃に含まれるようにし、
前記工具本体の先端部における底部に工具本体の軸心部を頂点とする山形状凹部を形成するとともに、
この山形状凹部の斜面に底刃を設け、前記山形状凹部の裾部に、内周部では前記底刃と９０°より大きい角度を持って連続し、
外周部では前記底刃と前記ネジ切り刃との間に連続して設けられ、前記荒刃と一致する角度を持って連続する外周刃を設け、
前記工具本体を自転させながら軸方向にヘリカル送りを行うことにより、前記底刃および前記外周刃の切削加工によって被加工物に下穴が開けられ、次に、前記下穴の内周面に前記荒刃によってネジ切り加工が行われ、さらに、前記荒刃によって切削されたネジ切り跡を前記仕上げ刃によって切削し、完全ネジ山が加工されるようにしたことを特徴とするネジ切り工具。In a thread cutting tool provided with a thread-shaped thread cutting blade on the side at the tip of the tool body,
The thread cutting blade is at least one of the front end side is a rough blade, the other is a finishing blade,
The rough blade is formed lower than the finishing blade,
The thread angle θ 2 of the rough blade is equal to or larger than the thread angle θ 1 of the finishing blade, and when the rough blade and the finishing blade are overlapped, the rough blade becomes the finishing blade. To be included in the
While forming a mountain-shaped concave portion with the axial center of the tool body at the apex at the bottom of the tip of the tool body,
A bottom blade is provided on the slope of the mountain-shaped recess, and the bottom of the mountain-shaped recess is continuous with the bottom blade at an angle greater than 90 ° at the inner periphery.
In the outer peripheral portion, provided continuously between the bottom blade and the thread cutting blade, and provided with an outer peripheral blade that has a continuous angle with the rough blade ,
By performing helical feeding in the axial direction while rotating the tool main body, a pilot hole is opened in the workpiece by cutting the bottom blade and the outer peripheral blade, and then the inner peripheral surface of the pilot hole is A thread cutting tool, wherein thread cutting is performed with a rough blade, and further, a thread cut trace cut with the rough blade is cut with the finishing blade so that a complete thread is processed .
JP03666096A 1996-02-23 1996-02-23 Thread cutting tool Expired - Fee Related JP3740503B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03666096A JP3740503B2 (en) 1996-02-23 1996-02-23 Thread cutting tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP03666096A JP3740503B2 (en) 1996-02-23 1996-02-23 Thread cutting tool

Publications (2)

Publication Number Publication Date
JPH09225743A JPH09225743A (en) 1997-09-02
JP3740503B2 true JP3740503B2 (en) 2006-02-01

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Publication number Priority date Publication date Assignee Title
JP4516169B2 (en) * 1999-10-13 2010-08-04 本田技研工業株式会社 Combined machining tool
JP4872305B2 (en) * 2005-10-24 2012-02-08 日本精工株式会社 Nut thread groove processing method of ball nut
JP2008105144A (en) * 2006-10-26 2008-05-08 Toyota Motor Corp Internal thread working method
JP5601464B2 (en) * 2010-10-18 2014-10-08 日立ツール株式会社 Thread milling machine for hardened materials
US10940553B2 (en) * 2016-01-13 2021-03-09 Mitsubishi Hitachi Tool Engineering, Ltd. Screw thread cutter
CN109963678B (en) 2017-01-18 2021-10-22 Osg株式会社 Thread milling cutter
JP6383025B2 (en) * 2017-01-31 2018-08-29 東和機工株式会社 Threading tools, tips and holders
KR200489584Y1 (en) * 2018-12-27 2019-07-05 송기평 Thread mill for cutting tools

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