JP2007313590A - Thread cutting tip, and its manufacturing method - Google Patents

Thread cutting tip, and its manufacturing method Download PDF

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JP2007313590A
JP2007313590A JP2006144091A JP2006144091A JP2007313590A JP 2007313590 A JP2007313590 A JP 2007313590A JP 2006144091 A JP2006144091 A JP 2006144091A JP 2006144091 A JP2006144091 A JP 2006144091A JP 2007313590 A JP2007313590 A JP 2007313590A
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blade
thread
finishing
cutting
surface roughness
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Daisuke Yoshiba
大助 吉葉
Hidekazu Nunokawa
英一 布川
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Tungaloy Corp
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Tungaloy Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a thread cutting tip which can be manufactured in a short time at a low cost, and can accurately cut a thread, and further to provide its manufacturing method. <P>SOLUTION: The thread cutting tip is mounted in a specified position of a thread cutting tool body, and has a plurality of cutting edges having shapes corresponding to the thread to be cut. These cutting edges are formed as follows. Among these cutting edges, at least one cutting edge arranged on the front side in the feeding direction is a roughing cutting edge, and at least one cutting edge arranged on the rear side in the feeding direction is a fishing cutting edge. The fishing cutting edge is higher than the roughing cutting edge. When the shape of the finishing cutting edge and the shape of the roughing cutting edge are overlapped, the roughing cutting edge is included in the finishing cutting edge. In addition, the surface roughness of the flank of the roughing cutting edge is larger than that of the flank of the finishing cutting edge. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ねじ切り工具に装着されるねじ切り加工用チップ、およびその製造方法に関する。   The present invention relates to a threading tip to be mounted on a threading tool and a method for manufacturing the same.

ねじ切り工具に取り付けられるねじ切り加工用チップは、ねじ山に合致する形状に形成された1つ又は複数の山形状の切れ刃を有し、これらの切れ刃が被加工物に転写されることによってねじ切りが行われる。複数の山形状の切れ刃を有するねじ切り加工用チップとして、例えば、特許文献1がある。そのねじ切りは、通常、荒加工と仕上げ加工とに切込みを分けて切削が行われるため、工程数が多く効率が悪い。
そのため、このようなねじ切り加工用チップの中には、工具本体に取り付けられた際の切れ刃の送り方向における前方側に荒刃、後方側に仕上げ刃を設け、切削に伴い荒刃によって切削されたねじ切り跡を仕上げ刃によって切削することにより、ねじ形状に仕上げられるようにしたものがある。これにより、荒加工と仕上げ加工が一度にでき、かつ、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、精度の高いねじ切り加工ができる。
特開平5−277809号公報(第1図)
A threading tip that is attached to a threading tool has one or more thread-shaped cutting edges formed in a shape that matches the thread and these cutting edges are transferred to the work piece for threading. Is done. For example, Patent Document 1 discloses a threading tip having a plurality of mountain-shaped cutting edges. The thread cutting is usually performed by dividing the cutting into a roughing process and a finishing process, so that the number of processes is large and the efficiency is low.
Therefore, some of these threading tips are provided with a rough edge on the front side and a finishing edge on the rear side in the feed direction of the cutting edge when attached to the tool body, and are cut by the rough edge along with the cutting. There are some which are made to be finished into a screw shape by cutting the screw thread trace with a finishing blade. Thereby, roughing and finishing can be performed at the same time, and the cutting depth of the finishing blade is reduced, so that cutting resistance is low and highly accurate threading can be performed.
JP-A-5-277809 (FIG. 1)

しかしながら、上記ねじ切り加工用チップを製造する場合には、一般的には、複数の切れ刃全体を砥石の研削面形状を転写させるようにして研削する総形研削加工により形成するため、荒刃と仕上げ刃の区別なく仕上げ刃の精度を基準とした研削条件に設定されるので、過剰な品質の製品を供給することになるとともに、送り量の増大等が図れず研削能率が上がらないという問題があった。これを回避するために研削能率を上げると、研削抵抗が大きくなり、仕上げ刃の精度及び逃げ面の表面粗さが悪化するため、加工ねじの加工寸法精度及び仕上げ面の表面粗さが悪化するという問題がある。
また、複雑かつ微細なねじ切りを行うような、さらに高い精度が要求されるねじ切り加工用チップを製造する場合には、所要の製品形状と実際の工作物の投影図を重ね合わせてその輪郭に沿って砥石を動かし倣い研削するプロファイル研削加工により形成するため(図4参照)、研削に長時間を要するので、製造効率が悪く製造コストが高くなるという問題があった。これを回避するため上記輪郭に沿って砥石を動かす量を大きくして製造効率を高めようとすると、研削抵抗が大きくなり、仕上げ刃の精度及び逃げ面の表面粗さが悪化するという問題がある。
However, in the case of manufacturing the above-described thread cutting tip, generally, a plurality of cutting edges are formed by a general grinding process for grinding so as to transfer the grinding surface shape of the grindstone. Since the grinding conditions are set based on the precision of the finishing blade without distinguishing between the finishing blades, there will be a problem that excessive quality products will be supplied and the feed rate will not increase and the grinding efficiency will not increase. there were. If the grinding efficiency is increased to avoid this, the grinding resistance increases, and the precision of the finishing blade and the surface roughness of the flank surface deteriorate, so the processing dimensional accuracy of the processing screw and the surface roughness of the finishing surface deteriorate. There is a problem.
In addition, when manufacturing a threading tip that requires even higher precision, such as complex and fine threading, the required product shape and the projected image of the actual workpiece are overlaid along the contour. In this case, the grinding is performed by profile grinding that moves and grinds the grinding wheel (see FIG. 4), so that a long time is required for grinding. In order to avoid this, if the amount of movement of the grindstone is increased along the contour to increase the production efficiency, the grinding resistance increases, and the accuracy of the finishing blade and the surface roughness of the flank face deteriorate. .

本発明は、上記問題を解決するためになされたもので、短時間かつ低コストで製造することができる加工ねじ精度に優れたねじ切り加工用チップおよびその製造方法を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a threading tip excellent in processing screw accuracy that can be manufactured in a short time and at a low cost, and a manufacturing method thereof.

上記課題を解決するために、本発明は以下の手段を採用する。
請求項1に記載の発明は、ねじ切り工具本体の所定位置に装着される加工すべきねじ山に対応する山形状の複数の切れ刃を有するねじ切り加工用チップであって、これら切れ刃のうち、送り方向における前方側の少なくとも1つが荒刃で、後方側の少なくとも1つが仕上げ刃であり、仕上げ刃の山の高さが荒刃の山の高さより大きく、この仕上げ刃と荒刃の山形状を重ねたときに荒刃が仕上げ刃に含まれるように形成されるとともに、荒刃の逃げ面における表面粗さが仕上げ刃の逃げ面における表面粗さよりも粗いことを特徴とする。
In order to solve the above problems, the present invention employs the following means.
The invention according to claim 1 is a threading tip having a plurality of thread-shaped cutting edges corresponding to a thread to be machined to be mounted at a predetermined position of the threading tool body, and among these cutting edges, At least one of the front side in the feed direction is a rough blade, and at least one of the rear side is a finish blade, and the height of the crest of the finish blade is larger than the height of the crest of the rough blade. The rough blade is formed so as to be included in the finishing blade when the two are stacked, and the surface roughness on the flank face of the rough blade is rougher than the surface roughness on the flank face of the finishing blade.

本発明によれば、荒刃の逃げ面における表面粗さが仕上げ刃の逃げ面における表面粗さよりも粗い構成となっていることから、仕上げ刃の精度および逃げ面の表面粗さを維持しつつ従来と比べて研削時間が少なくて済むので、短時間かつ低コストでねじ切り加工用チップを提供することができる。また、仕上げ刃の山の高さが荒刃の山の高さより大きく、仕上げ刃と荒刃の山形状を重ねたときに荒刃が仕上げ刃に含まれるように形成されていることにより、仕上げ刃によって切削されたねじ切り跡が被加工物の最終加工面となるので、荒刃の逃げ面における表面粗さが仕上げ刃の逃げ面における表面粗さよりも粗い構成となっていても、仕上げ刃の逃げ面における表面粗さが維持されていれば優れた仕上げ面粗さと高い加工寸法精度を実現することができる。   According to the present invention, since the surface roughness of the flank face of the rough blade is rougher than the surface roughness of the flank face of the finishing blade, the accuracy of the finishing blade and the surface roughness of the flank face are maintained. Since less grinding time is required than in the prior art, a threading insert can be provided in a short time and at a low cost. In addition, the finishing blade has a height higher than the height of the rough blade, and when the finishing blade and the rough blade are stacked, the rough blade is included in the finishing blade. Since the thread cutting trace cut by the blade becomes the final machining surface of the work piece, even if the surface roughness on the flank face of the rough blade is rougher than the surface roughness on the flank face of the finishing blade, If the surface roughness of the flank is maintained, excellent finished surface roughness and high machining dimensional accuracy can be realized.

請求項2に記載の発明は、請求項1のねじ切り加工用チップにおいて、仕上げ刃の山元部における側部に、切り出されたねじ山の山頂部をさらうさらい刃を有し、このさらい刃の逃げ面における表面粗さが仕上げ刃の逃げ面における表面粗さと同等であることを特徴とするものである。   According to a second aspect of the present invention, in the thread cutting tip of the first aspect, the side of the finished blade has a wiping blade that rubs the crest of the thread that is cut out. The surface roughness on the surface is equivalent to the surface roughness on the flank face of the finishing blade.

本発明によれば、さらい刃の働きにより切り出されたねじ山の精度が向上するとともに、被加工物の仕上げ面の品位も向上する。また、仕上げ刃およびさらい刃の精度および逃げ面の表面粗さを維持しつつ、荒刃の逃げ面における表面粗さが仕上げ刃およびさらい刃の逃げ面における表面粗さよりも粗い構成となっていることから、短時間かつ低コストで加工ねじ精度に優れたねじ加工用チップを提供することができる。   According to the present invention, the accuracy of the thread cut out by the action of the wiping blade is improved, and the quality of the finished surface of the workpiece is also improved. In addition, the surface roughness of the rough blade flank is rougher than the surface roughness of the finishing blade and flank flank while maintaining the accuracy of the finishing blade and wiping blade and the surface roughness of the flank. As a result, it is possible to provide a screw machining tip that is excellent in machining screw accuracy in a short time and at a low cost.

請求項3に記載の発明は、請求項1または2のねじ切り加工用チップにおいて、仕上げ刃の逃げ面における表面粗さが最大高さ(Rz)で0.5μm以上10μm以下であることを特徴とするものである。   The invention according to claim 3 is characterized in that, in the threading tip of claim 1 or 2, the surface roughness on the flank face of the finishing blade is 0.5 μm or more and 10 μm or less at the maximum height (Rz). To do.

本発明によれば、工具送り方向の最後部に位置し被加工物の最終加工面に転写される仕上げ刃の逃げ面における表面粗さが、最大高さ(Rz)で0.5μm以上10μm以下であることから、被加工物の仕上げ面を滑らかにすることができ、ねじ精度の高いねじ切り加工を行うことができる。   According to the present invention, the surface roughness of the flank of the finishing blade that is located at the last part in the tool feed direction and is transferred to the final machining surface of the workpiece is 0.5 μm or more and 10 μm or less in terms of the maximum height (Rz). Therefore, the finished surface of the workpiece can be smoothed, and threading with high screw accuracy can be performed.

請求項4に記載の発明は、ねじ切り工具本体の所定位置に装着される加工すべきねじ山に対応する山形状の複数の切れ刃を有するとともに、これら切れ刃のうち、送り方向における前方側の少なくとも1つが荒刃で後方側の少なくとも1つが仕上げ刃であるねじ切り加工用チップの製造方法であって、切れ刃を形成した焼結体を作製した後、少なくとも仕上げ刃をプロファイル研削または総形研削によって加工する工程を備えることを特徴とする。   The invention according to claim 4 has a plurality of ridge-shaped cutting edges corresponding to the thread to be machined to be mounted at a predetermined position of the thread cutting tool main body, and of these cutting edges, the front side in the feed direction. A method for manufacturing a threading tip in which at least one is a rough blade and at least one rear side is a finish blade, and after producing a sintered body having a cut edge, at least the finish blade is profile-ground or profile-ground. It is characterized by comprising the process of processing by.

本発明によれば、切れ刃を形成した焼結体を作製した後、少なくとも仕上げ刃をプロファイル研削または総形研削によって加工すれば、被加工物の最終加工面に転写される仕上げ刃の精度及び逃げ面の表面粗さが向上するため、加工ねじの加工寸法精度及び仕上げ面の表面粗さに優れたねじ切り加工用チップを製造することができるうえに、従来と比べて研削量が少なくて済み加工が容易であることから製造工程が簡略化され、製造効率の向上を図ることができ、製造コストを縮減することができるという利点がある。   According to the present invention, after producing a sintered body in which a cutting edge is formed, if at least the finishing blade is processed by profile grinding or overall grinding, the accuracy of the finishing blade transferred to the final processing surface of the workpiece and Since the surface roughness of the flank is improved, it is possible to manufacture a threading insert with excellent machining dimensional accuracy and surface roughness of the finished surface, and the amount of grinding can be reduced compared to the conventional method. Since processing is easy, the manufacturing process is simplified, manufacturing efficiency can be improved, and manufacturing costs can be reduced.

本発明のねじ切り加工用チップによれば、仕上げ刃の精度及び逃げ面の表面粗さを維持しつつ、短時間かつ低コストで製造することができる、加工ねじの加工寸法精度及び仕上げ面の表面粗さに優れたねじ切り加工用チップを提供することができる。   According to the thread cutting tip of the present invention, the processing screw precision and the surface of the finished surface can be manufactured in a short time and at a low cost while maintaining the accuracy of the finishing blade and the surface roughness of the flank. A threading tip having excellent roughness can be provided.

以下、本発明の一実施形態に係るねじ切り加工用チップについて、図面に基づいて説明する。
図1は本発明の第1の実施形態に係るねじ切り加工用チップを示す平面図である。図2は本発明の第2の実施形態に係るねじ切り加工用チップを示す平面図であり、図3はその斜視図である。
Hereinafter, a threading tip according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a threading tip according to a first embodiment of the present invention. FIG. 2 is a plan view showing a threading tip according to a second embodiment of the present invention, and FIG. 3 is a perspective view thereof.

本実施形態に係るねじ切り加工用チップ10は、図1に示されるように、加工すべきねじ山に対応する山形状の複数の切れ刃11,12を形成してなる。そして、この切れ刃11,12のうち、ねじ切り工具本体の所定位置に取り付けられた際の工具送り方向Fにおける前方側の少なくとも1つは荒刃11に、後方側の少なくとも1つは仕上げ刃12に形成され、この仕上げ刃12の山の高さは荒刃11の山の高さより大きく、仕上げ刃12と荒刃11の山形状を重ねたときに荒刃11が仕上げ刃12に含まれるように形成されている。さらに、この荒刃の逃げ面21における表面粗さは、仕上げ刃の逃げ面22における表面粗さよりも粗い構成となっている(図3参照)。   As shown in FIG. 1, the threading tip 10 according to the present embodiment is formed with a plurality of mountain-shaped cutting edges 11 and 12 corresponding to the thread to be machined. Of these cutting edges 11, 12, at least one of the front side in the tool feed direction F when attached to a predetermined position of the thread cutting tool body is the roughing blade 11, and at least one of the rear side is the finishing blade 12. The height of the crest of the finishing blade 12 is larger than the height of the crest of the rough blade 11, and the rough blade 11 is included in the finishing blade 12 when the crest shapes of the finishing blade 12 and the rough blade 11 are overlapped. Is formed. Furthermore, the surface roughness of the flank 21 of the rough blade is rougher than the surface roughness of the flank 22 of the finishing blade (see FIG. 3).

このねじ切り加工用チップ10は、例えば、旋盤においてねじ切りバイトを使用してねじ切りを行う場合には、ねじ切りバイト本体の先端部における側部に装着され、回転させた被加工物に接触させながら、加工すべきねじのリードに合った送りにより移動させて使用される。また、工具自体を回転させてねじ切りを行う場合には、チェーザー、フライスおよびダイス等の所定位置に装着されて使用される。   For example, when threading is performed using a threading tool on a lathe, the threading chip 10 is attached to a side portion at the tip of the threading tool body, while being in contact with a rotated workpiece. It is used by being moved by feeding that matches the lead of the screw to be used. Further, when threading is performed by rotating the tool itself, it is used by being mounted at a predetermined position such as a chaser, a milling cutter and a die.

このようなねじ切り加工用チップ10を取り付けたねじ切り工具を用いたねじ切りは、荒刃11によって切削されたねじ切り跡が仕上げ刃12によって再度切削されることにより行われる。すなわち、工具送り方向Fの最後部に位置する仕上げ刃12の精度が被加工物の最終加工面の仕上がりを左右することになる。一方、工具送り方向Fの前方に位置する荒刃11は、仕上げ刃12の先行刃としての役割を果たすことになるので、荒刃11の精度が被加工物の最終加工面に影響を与えることはなく、実用上は精度、逃げ面21の表面粗さおよび刃立ちが悪くても最終製品の品質を劣化させることはない。   The thread cutting using the thread cutting tool to which the thread cutting tip 10 is attached is performed by cutting the thread cutting trace cut by the rough blade 11 again by the finishing blade 12. That is, the accuracy of the finishing blade 12 positioned at the last part in the tool feed direction F determines the finish of the final machining surface of the workpiece. On the other hand, the rough blade 11 positioned in front of the tool feed direction F plays a role as a leading blade of the finishing blade 12, so that the accuracy of the rough blade 11 affects the final machining surface of the workpiece. In practice, the quality of the final product is not deteriorated even if the accuracy, the surface roughness of the flank 21 and the cutting edge are poor.

このため、被加工物の仕上げ面に転写される仕上げ刃の逃げ面22の表面粗さ等が所望の条件を満たしていれば、荒刃の逃げ面21における表面粗さが仕上げ刃の逃げ面22の表面粗さよりも粗い構成となっていても、優れた仕上げ面粗さと高い加工寸法精度を実現することができる。また、荒刃の精度及び逃げ面22の表面粗さは必ずしも仕上げ刃と同等である必要はなく特に高品質であることまでは要求されないことから、従来と比べて研削時間が少なくて済むので、短時間かつ低コストでねじ切り加工用チップ10を製造することができる。   Therefore, if the surface roughness or the like of the flank 22 of the finishing blade transferred to the finished surface of the workpiece satisfies a desired condition, the surface roughness of the flank 21 of the rough blade is the flank of the finishing blade. Even if the surface roughness is greater than the surface roughness of 22, excellent finished surface roughness and high processing dimensional accuracy can be realized. In addition, since the accuracy of the rough blade and the surface roughness of the flank 22 do not necessarily have to be equal to those of the finishing blade and are not particularly required to be of high quality, the grinding time can be reduced compared to the conventional method. The threading tip 10 can be manufactured in a short time and at a low cost.

次に、本発明の第2の実施形態に係るねじ切り加工用チップ10について説明する。
本実施形態は、上述した第1の実施形態とは基本的構成が同じで、さらい刃13を有している点が異なっている。よって、上述した第1の実施形態の説明と共通する構成要素には同一の符号を付して、その詳細な説明は省略し、相違する点について説明する。
Next, a threading tip 10 according to a second embodiment of the present invention will be described.
The present embodiment has the same basic configuration as the first embodiment described above, but differs in that it has a wiping blade 13. Therefore, the same components as those in the first embodiment described above are denoted by the same reference numerals, detailed description thereof will be omitted, and differences will be described.

本実施形態に係るねじ切り加工用チップ10は、図2に示されるように、第1の実施形態に係るねじ切り加工用チップ10に、さらに、切り出されたねじ山の山頂部をさらうさらい刃13を、仕上げ刃12の山元部における側部に形成してなる。そして、このさらい刃の逃げ面23における表面粗さは仕上げ刃の逃げ面22における表面粗さと同等の構成となっている(図3参照)。   As shown in FIG. 2, the threading tip 10 according to the present embodiment is further provided with a wiping blade 13 that wipes out the crest of the thread that has been cut out from the threading tip 10 according to the first embodiment. , Formed on the side of the top of the finishing blade 12. The surface roughness of the flank 23 of the wiping blade is equal to the surface roughness of the flank 22 of the finishing blade (see FIG. 3).

このさらい刃13があることにより、ねじ山の精度が向上するとともに、被加工物の仕上げ面の品位も向上する。また、第1の実施形態に係るねじ切り加工用チップと同様に、荒刃の逃げ面21における表面粗さが仕上げ刃の逃げ面22およびさらい刃の逃げ面23の表面粗さよりも粗い構成となっていることで、従来と比べて研削時間を短縮することができ、製造コストの低減を図ることができる。このように荒刃の逃げ面21における表面粗さが粗い構成となっていても、被加工物の仕上げ面に転写される仕上げ刃の逃げ面22およびさらい刃の逃げ面23の表面粗さ等が所望の条件を満たしていれば、加工ねじの加工寸法精度及び仕上げ面粗さを維持することができる。   The presence of the wiping blade 13 improves the accuracy of the thread and improves the quality of the finished surface of the workpiece. Further, similarly to the thread cutting tip according to the first embodiment, the surface roughness on the flank face 21 of the rough blade is rougher than the surface roughness of the flank face 22 of the finishing blade and the flank face 23 of the wiping edge. As a result, the grinding time can be shortened compared to the conventional case, and the manufacturing cost can be reduced. Even if the rough surface of the flank 21 of the rough blade is thus rough, the surface roughness of the flank 22 of the finishing blade and the flank 23 of the wiping blade transferred to the finished surface of the workpiece, etc. If the desired condition is satisfied, the machining dimensional accuracy and the finished surface roughness of the machining screw can be maintained.

ここで、第1および第2の実施形態に係るねじ切り加工用チップ10においては、工具送り方向Fの最後部に位置する仕上げ刃の逃げ面の表図面粗さは加工物の最終加工面に転写されることになるため、仕上げ刃の逃げ面22における表面粗さは、最大高さ(Rz)で0.5μm以上10μm以下であることが好ましい。また、仕上げ刃12の山元部における側部にさらい刃13を設けた場合には、このさらい刃の逃げ面23の表面粗さも、最大高さ(Rz)で0.5μm以上10μm以下とすることが好ましい。
このような構成とすることで、被加工物の仕上げ面を滑らかにすることができ、良好な加工面品位を維持するとともに、ねじ精度の高いねじ切り加工を行うことができる。
Here, in the threading tip 10 according to the first and second embodiments, the surface drawing roughness of the flank of the finishing blade located at the last part in the tool feed direction F is transferred to the final machining surface of the workpiece. Therefore, the surface roughness of the flank 22 of the finishing blade is preferably 0.5 μm or more and 10 μm or less in terms of the maximum height (Rz). In addition, when the wiping blade 13 is provided on the side portion at the peak portion of the finishing blade 12, the surface roughness of the flank 23 of the wiping blade is also 0.5 μm or more and 10 μm or less in the maximum height (Rz). Is preferred.
By adopting such a configuration, the finished surface of the workpiece can be smoothed, a good surface finish can be maintained, and threading with high screw accuracy can be performed.

さらに、切れ刃11,12の刃先が尖鋭であると欠け易くねじ切り性能が劣ることになるので、ある程度刃先を鈍化させることで耐チッピング性、耐欠損性の向上を図るべく、切れ刃11,12の刃先稜線部に丸ホーニングあるいは複合ホーニング等を施すことにより刃先強化処理を行うことが好ましい。例えば、丸ホーニングを施す場合には、ねじ切り加工用チップ10のすくい面に直交する方向からみたホーニング幅を曲率半径R0.02〜0.15mmの範囲に設定するとよい。   Further, if the cutting edges of the cutting edges 11 and 12 are sharp, they are likely to be chipped and the threading performance is inferior. It is preferable to perform the cutting edge strengthening process by applying round honing or composite honing to the cutting edge ridge line. For example, when round honing is performed, the honing width viewed from the direction perpendicular to the rake face of the threading tip 10 may be set within a range of a curvature radius R of 0.02 to 0.15 mm.

なお、第1および第2の実施形態に係るねじ切り加工用チップとして、図1および図2において、2つの荒刃11a,11bと1つの仕上げ刃12が形成されたねじ切り加工用チップを図示したが、荒刃11および仕上げ刃12は少なくとも1つ以上形成されていれば任意の個数を形成してもよく、その個数はこれに限定されるものではない。また、本実施形態に係る加工用チップに形成される切れ刃11,12としては、三角ねじ、台形ねじ、平行ねじ、テーパねじその他の加工すべきねじ山に対応する任意の形状を採用することができ、その形状は図1および図2に図示される形状に限定されるものではない。
また、図2において、さらい刃13を仕上げ刃12の前方側の山元部における側部に設けた第2の実施形態に係るねじ切り加工用チップを図示したが、これに限定されるものではなく、さらい刃13を仕上げ刃12の後方側の山元部における側部に設けてもよく、また、前方側と後端側の両方に設けてもよい。
In addition, although the threading chip | tip in which the two rough blades 11a and 11b and the one finishing blade 12 were formed in FIG.1 and FIG.2 was shown in figure as a threading chip | tip concerning 1st and 2nd embodiment. As long as at least one rough blade 11 and finishing blade 12 are formed, any number may be formed, and the number is not limited to this. In addition, as the cutting edges 11 and 12 formed on the machining tip according to the present embodiment, an arbitrary shape corresponding to a thread to be machined such as a triangular screw, a trapezoidal screw, a parallel screw, a taper screw or the like is adopted. The shape is not limited to the shape shown in FIGS. 1 and 2.
Further, in FIG. 2, the thread cutting tip according to the second embodiment in which the wiping blade 13 is provided on the side portion of the front portion of the finishing blade 12 is illustrated, but the present invention is not limited thereto. The wiping blade 13 may be provided on the side portion of the mountain portion on the rear side of the finishing blade 12, or may be provided on both the front side and the rear end side.

次に、本発明の一実施形態に係るねじ切り加工用チップの製造方法について、図1乃至図3を用いて以下に説明する。
本実施形態に係るねじ切り加工用チップを製造するには、まず、工具送り方向Fにおける前方側の少なくとも1つを荒刃11、後方側の少なくとも1つを仕上げ刃12とする、加工すべきねじ山に対応する山形状の複数の切れ刃11,12を形成してなる、焼結体を作製する。この焼結体は、超硬合金、サーメット、セラミックス等の高硬度焼結体のなかから選ばれる。
次に、得られた焼結体の切れ刃11,12となる部分のうち、少なくとも仕上げ刃12となる部分(図1においてW2で示した部分)をプロファイル研削または総形研削によって加工する。
なお、仕上げ刃12の山元部における側部にさらい刃13を形成した焼結体としてもよく、この場合には、仕上げ刃12となる部分およびさらい刃13となる部分(図2においてW2で示した部分)をプロファイル研削または総形研削によって加工する。
Next, a method for manufacturing a threading chip according to an embodiment of the present invention will be described below with reference to FIGS.
In order to manufacture the thread cutting tip according to the present embodiment, first, at least one of the front side in the tool feed direction F is the rough blade 11 and at least one of the rear side is the finishing blade 12 to be machined. A sintered body formed by forming a plurality of mountain-shaped cutting edges 11 and 12 corresponding to the mountain is produced. This sintered body is selected from high-hardness sintered bodies such as cemented carbide, cermet, and ceramics.
Next, among the portions to be the cutting edges 11 and 12 of the obtained sintered body, at least a portion to be the finishing blade 12 (portion indicated by W2 in FIG. 1) is processed by profile grinding or general shape grinding.
In addition, it is good also as the sintered compact which formed the wiping blade 13 in the side part in the peak part of the finishing blade 12, and in this case, the part used as the finishing blade 12 and the part used as the wiping blade 13 (indicated by W2 in FIG. 2) Are processed by profile grinding or profile grinding.

このように少なくとも仕上げ刃12をプロファイル研削または総形研削によって加工すれば、被加工物の最終加工面に転写される仕上げ刃12の精度及び逃げ面の表面粗さが向上するため、加工ねじの加工寸法精度及び仕上げ面の表面粗さに優れたねじ切り加工用チップを提供することができる。   If at least the finishing blade 12 is machined by profile grinding or profile grinding in this way, the accuracy of the finishing blade 12 transferred to the final machining surface of the workpiece and the surface roughness of the flank surface are improved. It is possible to provide a threading tip having excellent processing dimensional accuracy and surface roughness of the finished surface.

この場合において、切れ刃11,12となる部分のうち、被加工物の最終加工面に直接影響を与えることのない荒刃11となる部分(図1および図2においてW1で示した部分)は、寸法精度を上げる必要がないので研削を施さず、焼成時のままの焼結肌とすることが好ましい。
これにより、従来と比べ研削範囲が少なくて済み加工が容易であることから製造工程が簡略化され、製造効率の向上および製造コストの縮減を図ることができる。
なお、仕上げ刃12のみを総形研削により加工した場合に、焼結肌とのつなぎ部分に鋭利なエッジが形成される等の精度劣化が生じることで切れ刃欠損を誘発する恐れがあるが、焼結肌面と総形研削面のつなぎ部分の精度劣化を生じた部分のみをプロファイル研削にて補修することで防止することができる。
In this case, of the portions that become the cutting edges 11 and 12, the portion that becomes the rough blade 11 that does not directly affect the final machining surface of the workpiece (the portion indicated by W1 in FIGS. 1 and 2). Since it is not necessary to increase the dimensional accuracy, it is preferable not to perform grinding and to obtain a sintered skin as it is during firing.
As a result, since the grinding range is smaller than that of the prior art and machining is easy, the manufacturing process is simplified, and the manufacturing efficiency can be improved and the manufacturing cost can be reduced.
In addition, when only the finishing blade 12 is processed by overall grinding, there is a risk of inducing a cutting edge defect due to deterioration in accuracy such as formation of a sharp edge at the joint portion with the sintered skin. It can be prevented by repairing only the portion where the accuracy deterioration of the connecting portion between the sintered skin surface and the overall grinding surface is caused by profile grinding.

一方、複雑、微細なねじ切りを行うようなさらに高精度のねじ切り加工用チップが要求されるときには、仕上げ刃12のみならず荒刃11についてもプロファイル研削により加工する場合が考えられる。
しかし、所要の製品形状と実際の工作物の投影図を重ね合わせてその輪郭に沿ってプロファイル砥石30を動かし倣い研削するプロファイル研削加工(図4参照)は、幅の狭い円盤状砥石30を用いるため加工面全体を研削するには長時間を要し、製造効率が悪く製造コストが高くなってしまう。逆に、砥石30を上記輪郭に沿って動かす量を大きくして製造効率を高めようとすると、研削抵抗が大きくなり、仕上げ刃の精度及び逃げ面の表面粗さが悪化してしまう。
そこで、このようなねじ切り加工用チップが要求される場合には、被加工物の仕上げ面に転写される仕上げ刃12となる部分(図1においてW2で示した部分)では要求性能に応じた研削条件によりプロファイル研削を行い、被加工物の最終加工面に直接影響を与えることのない荒刃11となる部分(図1においてW1で示した部分)については、プロファイル砥石30を上記輪郭に沿って動かす量を仕上げ刃12のプロファイル研削時より大きくしてプロファイル研削を行うのが好ましい。
さらに荒刃11の前方側における食付き部が荒刃11の先行刃として切削に関与するときは、この食付き部となる部分も荒刃11と同様に、プロファイル砥石30を上記輪郭に沿って動かす量を仕上げ刃12のプロファイル研削時より大きくしてプロファイル研削を行うとよい。
これにより、従来と比べ研削時間が短縮し製造効率が向上するので、複雑、微細なねじ切りを行う高精度のねじ切り加工用チップを短時間かつ低コストで提供することが可能となる。
On the other hand, when a more accurate thread cutting tip that performs complicated and fine thread cutting is required, not only the finishing blade 12 but also the rough blade 11 may be processed by profile grinding.
However, in the profile grinding process (see FIG. 4) in which the required product shape and the projection drawing of the actual workpiece are superimposed and the profile grindstone 30 is moved along the contour thereof to copy-grind (see FIG. 4), a narrow disc-shaped grindstone 30 is used. Therefore, it takes a long time to grind the entire processed surface, resulting in poor manufacturing efficiency and high manufacturing cost. Conversely, if the amount of movement of the grindstone 30 along the contour is increased to increase the production efficiency, the grinding resistance increases, and the precision of the finishing blade and the surface roughness of the flank surface deteriorate.
Therefore, when such a threading tip is required, the portion corresponding to the finishing performance 12 (the portion indicated by W2 in FIG. 1) transferred to the finished surface of the workpiece is ground according to the required performance. Profile grinding is performed according to the conditions, and the portion of the rough blade 11 that does not directly affect the final machining surface of the workpiece (portion indicated by W1 in FIG. 1), the profile grindstone 30 is aligned along the contour. It is preferable to perform profile grinding with a moving amount larger than that during profile grinding of the finishing blade 12.
Further, when the biting portion on the front side of the rough blade 11 is involved in cutting as the leading blade of the rough blade 11, the portion serving as the biting portion is also connected to the profile grindstone 30 along the contour as in the rough blade 11. The profile grinding may be performed with the amount of movement larger than that during profile grinding of the finishing blade 12.
As a result, the grinding time is shortened and the production efficiency is improved as compared with the conventional case, so that it is possible to provide a high-precision threading tip for complex and fine threading in a short time and at a low cost.

なお、上記実施形態に係るねじ切り加工用チップの製造方法においては、仕上げ刃12のみをプロファイル研削または総形研削により加工する場合、ならびに、仕上げ刃12および荒刃11の両方をプロファイル研削により加工する場合を例に挙げて説明したが、これに限定されるものではなく、例えば、荒刃11を総形研削、仕上げ刃をプロファイル研削により加工してもよい。   In the method for manufacturing the thread cutting tip according to the above embodiment, when only the finishing blade 12 is processed by profile grinding or general shape grinding, and both the finishing blade 12 and the rough blade 11 are processed by profile grinding. Although the case has been described as an example, the present invention is not limited to this. For example, the rough blade 11 may be processed by general shape grinding and the finishing blade may be processed by profile grinding.

また、耐チッピング性、耐欠損性の向上を図る観点から切れ刃11,12の刃先強化処理としてホーニングを施す場合には、切れ刃のホーニング面の表面粗さは被加工物の仕上げ面精度に作用するため、研削粒度の影響や研削加工時にエッジ部の欠けを生じる等の不具合を生じやすいホーニング砥石を用いるのではなく、研磨ブラシを用いて加工するのが好ましい。
このように研磨ブラシを用いることで複雑、微細な切れ刃11,12であったとしてもホーニングを施すことができ、刃先の耐チッピング性、耐欠損性に優れたねじ切り加工用チップを提供することができる。
Further, when honing is performed as a cutting edge strengthening process for the cutting edges 11 and 12 from the viewpoint of improving chipping resistance and chipping resistance, the surface roughness of the honing surface of the cutting edge is related to the finished surface accuracy of the workpiece. Therefore, it is preferable to use a polishing brush instead of using a honing grindstone that is liable to cause problems such as the influence of the grinding grain size and chipping of the edge part during grinding.
Thus, by using a polishing brush, it is possible to perform honing even if the cutting edges 11 and 12 are complicated and fine, and to provide a threading tip having excellent chipping resistance and chipping resistance of the cutting edge. Can do.

本発明の第1の実施形態に係るねじ切り加工用チップを示す平面図である。It is a top view which shows the chip | tip for threading processing which concerns on the 1st Embodiment of this invention. 本発明の第2の実施形態に係るねじ切り加工用チップを示す平面図である。It is a top view which shows the chip | tip for thread cutting which concerns on the 2nd Embodiment of this invention. 図2のねじ切り加工用チップを示す斜視図である。It is a perspective view which shows the chip | tip for a thread cutting process of FIG. プロファイル研削加工時の砥石の動きを説明する図である。It is a figure explaining the movement of the grindstone at the time of profile grinding.

符号の説明Explanation of symbols

10 ねじ切り加工用チップ
11 荒刃
12 仕上げ刃
13 さらい刃
21 荒刃の逃げ面
22 仕上げ刃の逃げ面
23 さらい刃の逃げ面
30 プロファイル砥石
F 工具送り方向
DESCRIPTION OF SYMBOLS 10 Threading insert 11 Rough blade 12 Finishing blade 13 Fraying blade 21 Roughing blade flank 22 Finishing blade flank 23 Flushing blade flank 30 Profile grinding wheel F Tool feed direction

Claims (4)

ねじ切り工具本体の所定位置に装着される、加工すべきねじ山に対応する山形状の複数の切れ刃を有するねじ切り加工用チップであって、
これら切れ刃のうち、送り方向における前方側の少なくとも1つが荒刃で、後方側の少なくとも1つが仕上げ刃であり、
前記仕上げ刃の山の高さが、前記荒刃の山の高さより大きく、この仕上げ刃と荒刃の山形状を重ねたときに荒刃が仕上げ刃に含まれるように形成されるとともに、
前記荒刃の逃げ面における表面粗さが、前記仕上げ刃の逃げ面における表面粗さよりも粗い
ことを特徴とするねじ切り加工用チップ。
A thread cutting tip having a plurality of thread-shaped cutting blades corresponding to the thread to be machined, which is mounted at a predetermined position of the thread cutting tool body,
Among these cutting blades, at least one of the front side in the feed direction is a rough blade, and at least one of the rear side is a finishing blade,
The height of the crest of the finishing blade is larger than the height of the crest of the rough blade, and when the finishing blade and the crest shape of the rough blade are overlapped, the rough blade is included in the finishing blade,
A thread cutting tip characterized in that the surface roughness of the flank of the rough blade is rougher than the surface roughness of the flank of the finishing blade.
前記仕上げ刃の山元部における側部に、切り出されたねじ山の山頂部をさらうさらい刃を有し、
このさらい刃の逃げ面における表面粗さが、前記仕上げ刃の逃げ面における表面粗さと同等である
ことを特徴とする請求項1に記載のねじ切り加工用チップ。
On the side portion at the base portion of the finishing blade, there is a wiping blade that wipes the crest portion of the cut screw thread,
2. The threading tip according to claim 1, wherein a surface roughness of the flank face of the wiping blade is equal to a surface roughness of the flank face of the finishing blade.
前記仕上げ刃の逃げ面における表面粗さが、
最大高さ(Rz)で0.5μm以上10μm以下である
ことを特徴とする請求項1または2に記載のねじ切り加工用チップ。
The surface roughness of the flank of the finishing blade is
The tip for thread cutting according to claim 1 or 2, wherein the maximum height (Rz) is 0.5 µm or more and 10 µm or less.
ねじ切り工具本体の所定位置に装着される、加工すべきねじ山に対応する山形状の複数の切れ刃を有するとともに、これら切れ刃のうち、送り方向における前方側の少なくとも1つが荒刃で、後方側の少なくとも1つが仕上げ刃である、ねじ切り加工用チップの製造方法であって、
前記切れ刃を形成した焼結体を作製した後、少なくとも前記仕上げ刃をプロファイル研削または総形研削によって加工する工程を備える
ことを特徴とするねじ切り加工用チップの製造方法。

The cutting tool body is mounted at a predetermined position and has a plurality of angle-shaped cutting edges corresponding to the thread to be machined. Among these cutting edges, at least one of the front sides in the feed direction is a rough edge, and the rear A method for manufacturing a threading tip, wherein at least one of the sides is a finishing blade,
A method of manufacturing a threading tip, comprising the step of processing at least the finishing blade by profile grinding or general grinding after producing a sintered body having the cutting edge.

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WO2011105098A1 (en) * 2010-02-26 2011-09-01 株式会社タンガロイ Chaser and screw thread cutting method
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CN103889629A (en) * 2011-10-19 2014-06-25 住友电工硬质合金株式会社 Cutting tool for screw thread cutting
CN103889629B (en) * 2011-10-19 2016-01-27 住友电工硬质合金株式会社 Threading tool
KR20190078383A (en) * 2017-12-26 2019-07-04 주식회사 포스코 Insert for processing screw
WO2019132349A1 (en) * 2017-12-26 2019-07-04 주식회사 포스코 Insert for screw processing
KR102043790B1 (en) 2017-12-26 2019-11-12 주식회사 포스코 Insert for processing screw

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