JP3181703U - Chipless threading tool - Google Patents
Chipless threading tool Download PDFInfo
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- JP3181703U JP3181703U JP2012006788U JP2012006788U JP3181703U JP 3181703 U JP3181703 U JP 3181703U JP 2012006788 U JP2012006788 U JP 2012006788U JP 2012006788 U JP2012006788 U JP 2012006788U JP 3181703 U JP3181703 U JP 3181703U
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Abstract
【課題】予め下穴をトリミングした後に雌ねじを形成する切り屑無しねじ切り加工具を提供する。
【解決手段】挟持部１０とシャンク２０とを備えており、前記シャンク２０の周回壁面上には食い付き部２１とねじ部２２とが形成されており、前記シャンク２０の端面上には二つの切削溝２３と二つの切刃部２４とが形成されている。切り屑無しねじ切りタップ構造では、口径が所定の寸法に達していない下穴をまずその端面の前記切刃部２４で切削、トリミングし、続いて前記ねじ部２２を前記下穴の穴壁面に押し当てる方式で雌ねじを形成する。
【選択図】図１A chipless threading tool for forming a female thread after trimming a pilot hole in advance is provided.
A pinching portion and a shank are provided. A biting portion and a screw portion are formed on a circumferential wall surface of the shank, and two end surfaces of the shank are formed on the end surface of the shank. A cutting groove 23 and two cutting edge portions 24 are formed. In the threadless tapping structure without chips, a pilot hole whose diameter does not reach a predetermined dimension is first cut and trimmed by the cutting edge 24 on the end face, and then the screw 22 is pushed against the hole wall surface of the pilot hole. A female thread is formed by a contact method.
[Selection] Figure 1
Description
本考案は切り屑無しねじ切りタップ構造の改良に関し、とりわけ予め下穴をトリミングした後に雌ねじを形成する切り屑無しねじ切りタップ構造の改良に関する。 The present invention relates to an improvement of a chipless thread tapping structure, and more particularly to an improvement of a chipless thread tapping structure in which a female screw is formed after trimming a pilot hole in advance.
タップまたはねじ切りタップは「ねじ切り加工具」のことであり、主に挟持部の一端にて軸方向にシャンクが延設されており、前記シャンクの壁面周囲にねじ状のねじ部と食い付き部とが周回するように形成されており、前記食い付き部は前記シャンクの前端に設けられるとともに、前記食い付き部箇所の直径が前記ねじ部よりも小径となっている。前記シャンクが加工済みの下孔内に伸入したとき、前端の食い付き部が前記シャンクを前記下孔の軸方向に沿って案内した後、前記ねじ部により前記下穴箇所の壁面に雌ねじを成形する。 A tap or a threaded tap is a “thread cutting tool”, and a shank is extended in an axial direction mainly at one end of a clamping part, and a screw-like threaded part and a biting part are provided around the shank wall surface. The biting part is provided at the front end of the shank, and the diameter of the biting part is smaller than that of the screw part. When the shank extends into the machined pilot hole, the biting portion at the front end guides the shank along the axial direction of the pilot hole, and then the female screw is attached to the wall surface of the pilot hole by the screw portion. Mold.
一般的には、雌ねじの加工方法は概ね「切り屑有りねじ切り加工法」と「切り屑なしねじ切り加工法」の二種類に分けることができる。「切り屑有りねじ切り加工法」ではタップのねじ部で下穴の壁面を切削することで、雌ねじを形成するものである。そして「切り屑有りねじ切り加工法」ではタップのねじ部を下穴の壁面に押し当てて、壁面が加圧的に変形して雌ねじが形成されるというものである。比較すると、「切り屑有りねじ切り加工法」は硬質の被削材上に雌ねじを切削成形するのに適しているが、加工工程にて切り屑が発生する。一方「切り屑なしねじ切り加工法」は軟質の被加工材（例：アルミニウム板、ＰＣ板）にて押し当てて雌ねじを成型するのに適しており、前記雌ねじにおける各ねじ山の材料強度を確保するのに用いることができるうえ、加工工程ではわずかな切り屑しか発生しない。さらに、「切り屑なしねじ切り加工法」にて形成された雌ねじのねじ山のエッジは、「切り屑有りねじ切り加工法」で形成された雌ねじのねじ山のエッジよりもバリが少なく、小さい。 Generally, the processing method of the internal thread can be roughly divided into two types: “a threading method with chips” and “a threading method without chips”. In the “thread cutting method with chips”, the internal thread is formed by cutting the wall surface of the pilot hole with the thread portion of the tap. In the “thread cutting method with chips”, the thread portion of the tap is pressed against the wall surface of the pilot hole, and the wall surface is deformed in pressure to form a female screw. In comparison, the “thread cutting method with chips” is suitable for cutting a female thread on a hard work material, but chips are generated in the machining process. On the other hand, the “chipless thread cutting method” is suitable for molding internal threads by pressing with a soft workpiece (eg, aluminum plate, PC plate), and ensures the material strength of each thread in the internal thread. In addition, it can be used for processing, and only a small amount of chips are generated in the processing step. Furthermore, the thread edge of the female thread formed by the “chipless thread cutting method” has fewer burrs and is smaller than the thread edge of the female thread formed by the “chip cutting process with chip”.
このうち、「切り屑なしねじ切り加工法」について言えば、上記したように、作業者はまずドリルで板材上に下穴を開けて、続いてタップで雌ねじを成型しなければならない。しかしながら、ドリルは長時間使用するとなると、摩耗により切削された下穴が所定の口径に達することができず、前記タップで雌ねじを成型するときの抵抗力が増大し、前記タップが破断するという問題が引き起こされるとともに、形成されたねじ山の許容値も下がってしまう。 Among these, regarding the “chipless thread cutting method”, as described above, the operator must first drill a pilot hole on the plate with a drill, and then form a female thread with a tap. However, when the drill is used for a long time, the prepared hole cut due to wear cannot reach the predetermined diameter, and the resistance force when forming the internal thread with the tap increases, and the tap breaks. As well as the tolerance of the thread formed.
上記した従来技術における問題に鑑み、本考案では従来技術の切り屑なしタップ構造に改良を施すものであり、この設計により予め下穴を切削、トリミングした後に、続いて前記下穴箇所の壁面に雌ねじを形成できることを望むものである。 In view of the problems in the prior art described above, the present invention improves the prior art chipless tap structure, and after cutting and trimming the pilot hole in advance by this design, subsequently, it is applied to the wall surface of the pilot hole location. It would be desirable to be able to form an internal thread.
上記考案の目的を達成するために、本考案で利用する技術的手段では、切り屑無しねじ切りタップ構造の改良は挟持部とシャンクとを備えており、前記シャンクは前記挟持部の一端に設けられるとともに、前記挟持部の軸方向に沿って延在しており、前記シャンクは周回壁面と、一つの端面と、一つの食い付き部と、一つのねじ部と、二つの切削溝と、二つの切刃部とを備えており、前記食い付き部は前記シャンクの周回壁面にて前記シャンクの端面近傍箇所に周回するように成型されており、前記ねじ部は前記シャンクの周回壁面に周回するように成型されているとともに、前記食い付き部と前記挟持部との間に位置しており、前記二つの切削溝は互いが間隔を持つとともに互いに平行して軸方向に沿って前記シャンクの端面に凹設されており、しかも前記二つの切削溝は前記シャンクの周回壁面をそれぞれ貫通しており、前記二つの切刃部はそれぞれ前記シャンクの端面の中央から前記シャンクの端面の二つの対向する側に向かって傾斜して延在している。 In order to achieve the object of the present invention, in the technical means used in the present invention, the improvement of the chipless thread tapping structure includes a clamping part and a shank, and the shank is provided at one end of the clamping part. And extending along the axial direction of the clamping part, the shank has a circumferential wall surface, one end face, one biting part, one screw part, two cutting grooves, two A cutting edge portion, and the biting portion is formed so as to circulate around the end wall surface of the shank on the circumferential wall surface of the shank, and the screw portion circulates on the circumferential wall surface of the shank. The two cutting grooves are spaced apart from each other and parallel to each other along the axial direction on the end surface of the shank. Recessed In addition, the two cutting grooves penetrate through the circumferential wall surface of the shank, and the two cutting edge portions are inclined from the center of the end face of the shank toward two opposite sides of the end face of the shank. It is then extended.
上記したシャンクの端面に切刃部を形成した設計により、本考案における切り屑無しねじ切りタップ構造では、口径が所定の寸法に達していない下穴をまず前記切刃部で切削、トリミングし、続いて前記ねじ部を前記下穴の穴壁面に押し当てる方式で雌ねじを形成することで、前記切り屑無しねじ切りタップ構造にて前記ねじ部を押し当てて雌ねじを成型するときに受ける抵抗力を低減するとともに、シャンクが破断する不具合を減らし、ひいては切り屑無しねじ切りタップ構造の耐久性を確保すると同時に、形成された雌ねじの許容値をも確保することができる。 With the above-described design in which the cutting edge is formed on the end face of the shank, in the threadless tapping structure of the present invention, the pilot hole whose diameter has not reached the predetermined dimension is first cut and trimmed with the cutting edge, By forming the female thread by pressing the threaded part against the hole wall surface of the pilot hole, the resistance force received when molding the female thread by pressing the threaded part in the chipless threading tap structure is reduced. At the same time, it is possible to reduce the inconvenience that the shank breaks, thereby ensuring the durability of the threadless tap structure without chips, and at the same time, ensuring the tolerance of the formed female screw.
以下にて図面と本考案の好ましい実施例を合せて、本考案が所期の考案目的を達成するために採用する技術的手段をさらに詳細に説明する。 In the following, the technical means employed by the present invention to achieve the intended purpose will be described in more detail with reference to the drawings and preferred embodiments of the present invention.
図１を参照されたい。本考案の切り屑無しねじ切りタップ構造の改良は挟持部１０とシャンク２０とを備えている。 Please refer to FIG. The improvement of the chipless thread tapping structure of the present invention includes a clamping part 10 and a shank 20.
前記挟持部１０は駆動装置に挟持固定され、前記タップを回転させるのに供される。 The clamping unit 10 is clamped and fixed to a driving device and serves to rotate the tap.
図２および図３を合せて参照されたい。前記シャンク２０は前記挟持部１０の一端に設けられるとともに、前記挟持部１０の軸方向に沿って延在しており、前記シャンク２０は周回壁面と、一つの端面と、一つの食い付き部２１と、一つのねじ部２２と、二つの切削溝２３と、二つの切刃部２４とを備えている。 Please refer to FIG. 2 and FIG. 3 together. The shank 20 is provided at one end of the sandwiching portion 10 and extends along the axial direction of the sandwiching portion 10. The shank 20 has a circumferential wall surface, one end surface, and one biting portion 21. And one screw portion 22, two cutting grooves 23, and two cutting blade portions 24.
前記食い付き部２１は前記シャンク２０の周回壁面にて前記シャンク２０の端面近傍箇所に周回するように成型されており、前記食い付き部２１は複数本のねじ山を有している。前記ねじ部２２は前記シャンク２０の周回壁面に周回するように成型されているとともに、前記食い付き部２１と前記挟持部１０との間に位置しており、前記ねじ部２２は複数本のねじ山を有し、しかも前記ねじ部２２の直径は前記食い付き部２１の直径よりも大径となっている。 The bite portion 21 is formed to circulate around the end wall surface of the shank 20 on the circumferential wall surface of the shank 20, and the bite portion 21 has a plurality of threads. The threaded portion 22 is formed so as to circulate around the circumferential wall surface of the shank 20, and is positioned between the biting portion 21 and the clamping portion 10, and the threaded portion 22 includes a plurality of screws. In addition, the screw portion 22 has a diameter larger than the diameter of the biting portion 21.
前記二つの切削溝２３は互いが間隔を持つとともに互いに平行して軸方向に沿って前記シャンク２０の端面に凹設されており、しかも前記二つの切削溝２３は前記シャンク２０の周回壁面をそれぞれ貫通している。前記二つの切刃部２４は前記シャンク２０の端面に成型されるとともに、それぞれ前記シャンク２０の端面の中央から前記シャンク２０の端面の二つの対向する側に向かって傾斜して延在している。 The two cutting grooves 23 are spaced from each other and are recessed in the end face of the shank 20 along the axial direction in parallel with each other, and the two cutting grooves 23 are formed on the circumferential wall surface of the shank 20, respectively. It penetrates. The two cutting blade portions 24 are molded on the end face of the shank 20 and extend from the center of the end face of the shank 20 in an inclined manner toward two opposing sides of the end face of the shank 20. .
さらに図４を参照されたい。本考案の切り屑無しねじ切りタップ構造では、一枚の板材３０の下穴３１箇所の穴壁面を加工して雌ねじを形成するとき、もし前記下穴３１の穴径が所定の寸法に達していなければ、前記切刃部２４はまず前記下穴３１箇所の穴壁面を切削することで、前記下穴３１の穴径を前記切り屑無しねじ切りタップ構造で雌ねじを成型するに適した寸法まで拡大して、前記下穴３１の穴径の幅を前記食い付き部２１の直径の幅が概ね同じとすることで、前記食い付き部２１が前記シャンク２０を前記下穴３１の軸方向に沿って移動するようにスムースに案内して、後続のねじ部２２で前記下穴３１箇所の孔内壁に雌ねじを成型することが可能となっており、そして前記切削溝２３は切削時に発生した切り屑を収容可能となっている。 See further FIG. In the threadless tapping structure of the present invention, when the hole wall surface of the lower hole 31 of one plate member 30 is processed to form a female screw, the hole diameter of the lower hole 31 must reach a predetermined dimension. For example, the cutting edge portion 24 first cuts the hole wall surface of the pilot hole 31 to expand the hole diameter of the pilot hole 31 to a size suitable for molding a female screw with the chipless thread tapping structure. Thus, by setting the width of the hole diameter of the pilot hole 31 to be substantially the same as the diameter of the bite portion 21, the bite portion 21 moves the shank 20 along the axial direction of the pilot hole 31. Thus, it is possible to smoothly guide the internal thread to the inner wall of the 31 pilot holes by the subsequent screw portion 22, and the cutting groove 23 accommodates chips generated during cutting. It is possible.
本考案の切り屑無しねじ切りタップ構造の改良は、上記したシャンク２０の端面に切刃部２４を形成した設計により、前記切り屑無しねじ切りタップ構造のねじ部２２を押し当て雌ねじを成型するときに受ける抵抗力を効果的に低減することで、シャンク２０が破断する不具合を減らし、ひいては切り屑無しねじ切りタップ構造の耐久性を確保すると同時に、形成された雌ねじの許容値をも確保することができる。 The improvement of the chipless thread tapping structure of the present invention is based on the design in which the cutting edge portion 24 is formed on the end face of the shank 20 described above, when the threaded portion 22 of the chipless thread tapping structure is pressed to mold the internal thread. By effectively reducing the resistance force to be received, the failure of the shank 20 to be broken can be reduced, and as a result, the durability of the chipless thread cutting tap structure can be ensured, and at the same time, the tolerance of the formed female screw can be ensured. .
上記は本考案の好ましい実施例に過ぎず、本考案に如何なる形式上の制限を加えるものではなく、確かに本考案ではすでに好ましい実施例で上記のように開示したものの、これは本考案を限定するためのものではなく、当業者であれば本考案の技術的思想の範囲を逸脱することなく、本考案における実質的な技術にも基づいて以上の実施例に行われる如何なる簡単な修正、同等の変化および付加は、いずれも本考案の技術的思想の範囲内に含まれる。 The above is only a preferred embodiment of the present invention, and does not add any type of limitation to the present invention. Certainly, the present invention has already been disclosed in the preferred embodiment as described above, but this limits the present invention. However, those skilled in the art will be able to make any simple modifications or equivalents made to the above embodiments based on the substantial technique of the present invention without departing from the scope of the technical idea of the present invention. Any changes and additions are included within the scope of the technical idea of the present invention.
１０挟持部
２０シャンク
２１食い付き部
２２ねじ部
２３切削溝
２４切刃部
３０板材
３１下穴
10 clamping part 20 shank 21 biting part 22 thread part 23 cutting groove 24 cutting edge part 30 plate material 31 pilot hole
本考案は切り屑無しねじ切り加工具に関し、とりわけ予め下穴をトリミングした後に雌ねじを形成する切り屑無しねじ切り加工具に関する。 The present invention relates to a chipless threading tool, and more particularly to a chipless threading tool that forms a female thread after trimming a pilot hole in advance.
タップまたはねじ切りタップは「ねじ切り加工具」のことであり、主に挟持部の一端にて軸方向にシャンクが延設されており、前記シャンクの壁面周囲にねじ状のねじ部と食い付き部とが周回するように形成されており、前記食い付き部は前記シャンクの前端に設けられるとともに、前記食い付き部箇所の直径が前記ねじ部よりも小径となっている。前記シャンクが加工済みの下孔内に伸入したとき、前端の食い付き部が前記シャンクを前記下孔の軸方向に沿って案内した後、前記ねじ部により前記下穴箇所の壁面に雌ねじを成形する。 A tap or a threaded tap is a “thread cutting tool”, and a shank is extended in an axial direction mainly at one end of a clamping part, and a screw-like threaded part and a biting part are provided around the shank wall surface. The biting part is provided at the front end of the shank, and the diameter of the biting part is smaller than that of the screw part. When the shank extends into the machined pilot hole, the biting portion at the front end guides the shank along the axial direction of the pilot hole, and then the female screw is attached to the wall surface of the pilot hole by the screw portion. Mold.
一般的には、雌ねじの加工方法は概ね「切り屑有りねじ切り加工法」と「切り屑なしねじ切り加工法」の二種類に分けることができる。「切り屑有りねじ切り加工法」ではタップのねじ部で下穴の壁面を切削することで、雌ねじを形成するものである。そして「切り屑有りねじ切り加工法」ではタップのねじ部を下穴の壁面に押し当てて、壁面が加圧的に変形して雌ねじが形成されるというものである。比較すると、「切り屑有りねじ切り加工法」は硬質の被削材上に雌ねじを切削成形するのに適しているが、加工工程にて切り屑が発生する。一方「切り屑なしねじ切り加工法」は軟質の被加工材（例：アルミニウム板、ＰＣ板）にて押し当てて雌ねじを成型するのに適しており、前記雌ねじにおける各ねじ山の材料強度を確保するのに用いることができるうえ、加工工程ではわずかな切り屑しか発生しない。さらに、「切り屑なしねじ切り加工法」にて形成された雌ねじのねじ山のエッジは、「切り屑有りねじ切り加工法」で形成された雌ねじのねじ山のエッジよりもバリが少なく、小さい。 Generally, the processing method of the internal thread can be roughly divided into two types: “a threading method with chips” and “a threading method without chips”. In the “thread cutting method with chips”, the internal thread is formed by cutting the wall surface of the pilot hole with the thread portion of the tap. In the “thread cutting method with chips”, the thread portion of the tap is pressed against the wall surface of the pilot hole, and the wall surface is deformed in pressure to form a female screw. In comparison, the “thread cutting method with chips” is suitable for cutting a female thread on a hard work material, but chips are generated in the machining process. On the other hand, the “chipless thread cutting method” is suitable for molding internal threads by pressing with a soft workpiece (eg, aluminum plate, PC plate), and ensures the material strength of each thread in the internal thread. In addition, it can be used for processing, and only a small amount of chips are generated in the processing step. Furthermore, the thread edge of the female thread formed by the “chipless thread cutting method” has fewer burrs and is smaller than the thread edge of the female thread formed by the “chip cutting process with chip”.
このうち、「切り屑なしねじ切り加工法」について言えば、上記したように、作業者はまずドリルで板材上に下穴を開けて、続いてタップで雌ねじを成型しなければならない。しかしながら、ドリルは長時間使用するとなると、摩耗により切削された下穴が所定の口径に達することができず、前記タップで雌ねじを成型するときの抵抗力が増大し、前記タップが破断するという問題が引き起こされるとともに、形成されたねじ山の許容値も下がってしまう。 Among these, regarding the “chipless thread cutting method”, as described above, the operator must first drill a pilot hole on the plate with a drill, and then form a female thread with a tap. However, when the drill is used for a long time, the prepared hole cut due to wear cannot reach the predetermined diameter, and the resistance force when forming the internal thread with the tap increases, and the tap breaks. As well as the tolerance of the thread formed.
上記した従来技術における問題に鑑み、本考案では従来技術の切り屑なしタップ構造に改良を施すものであり、この設計により予め下穴を切削、トリミングした後に、続いて前記下穴箇所の壁面に雌ねじを形成できることを望むものである。 In view of the problems in the prior art described above, the present invention improves the prior art chipless tap structure, and after cutting and trimming the pilot hole in advance by this design, subsequently, it is applied to the wall surface of the pilot hole location. It would be desirable to be able to form an internal thread.
上記考案の目的を達成するために、本考案で利用する技術的手段では、切り屑無しねじ切り加工具は挟持部とシャンクとを備えており、前記シャンクは前記挟持部の一端に設けられるとともに、前記挟持部の軸方向に沿って延在しており、前記シャンクは周回壁面と、一つの端面と、一つの食い付き部と、一つのねじ部と、二つの切削溝と、二つの切刃部とを備えており、前記食い付き部は前記シャンクの周回壁面にて前記シャンクの端面近傍箇所に周回するように成型されており、前記ねじ部は前記シャンクの周回壁面に周回するように成型されているとともに、前記食い付き部と前記挟持部との間に位置しており、前記二つの切削溝は互いが間隔を持つとともに互いに平行して軸方向に沿って前記シャンクの端面に凹設されており、しかも前記二つの切削溝は前記シャンクの周回壁面をそれぞれ貫通しており、前記二つの切刃部はそれぞれ前記シャンクの端面の中央から前記シャンクの端面の二つの対向する側に向かって傾斜して延在している。 In order to achieve the object of the above invention, in the technical means used in the present invention, the chipless threading tool includes a clamping part and a shank, and the shank is provided at one end of the clamping part, The shank extends along the axial direction of the clamping part, and the shank has a circumferential wall surface, one end face, one biting part, one screw part, two cutting grooves, and two cutting edges. And the biting part is molded so as to circulate around the end wall surface of the shank on the circumferential wall surface of the shank, and the screw part is molded so as to circulate around the circumferential wall surface of the shank. The two cutting grooves are spaced apart from each other and parallel to each other and are recessed in the end face of the shank along the axial direction. Has been The two cutting grooves penetrate through the circumferential wall surface of the shank, and the two cutting edge portions extend from the center of the end face of the shank to be inclined toward two opposite sides of the end face of the shank. Exist.
上記したシャンクの端面に切刃部を形成した設計により、本考案における切り屑無しねじ切りタップ構造では、口径が所定の寸法に達していない下穴をまず前記切刃部で切削、トリミングし、続いて前記ねじ部を前記下穴の穴壁面に押し当てる方式で雌ねじを形成することで、前記切り屑無しねじ切りタップ構造にて前記ねじ部を押し当てて雌ねじを成型するときに受ける抵抗力を低減するとともに、シャンクが破断する不具合を減らし、ひいては切り屑無しねじ切りタップ構造の耐久性を確保すると同時に、形成された雌ねじの許容値をも確保することができる。 With the above-described design in which the cutting edge is formed on the end face of the shank, in the threadless tapping structure of the present invention, the pilot hole whose diameter has not reached the predetermined dimension is first cut and trimmed with the cutting edge, By forming the female thread by pressing the threaded part against the hole wall surface of the pilot hole, the resistance force received when molding the female thread by pressing the threaded part in the chipless threading tap structure is reduced. At the same time, it is possible to reduce the inconvenience that the shank breaks, thereby ensuring the durability of the threadless tap structure without chips, and at the same time, ensuring the tolerance of the formed female screw.
以下にて図面と本考案の好ましい実施例を合せて、本考案が所期の考案目的を達成するために採用する技術的手段をさらに詳細に説明する。 In the following, the technical means employed by the present invention to achieve the intended purpose will be described in more detail with reference to the drawings and preferred embodiments of the present invention.
図１を参照されたい。本考案の切り屑無しねじ切り加工具は挟持部１０とシャンク２０とを備えている。 Please refer to FIG. The chipless threading tool of the present invention includes a clamping part 10 and a shank 20.
前記挟持部１０は駆動装置に挟持固定され、前記タップを回転させるのに供される。 The clamping unit 10 is clamped and fixed to a driving device and serves to rotate the tap.
図２および図３を合せて参照されたい。前記シャンク２０は前記挟持部１０の一端に設けられるとともに、前記挟持部１０の軸方向に沿って延在しており、前記シャンク２０は周回壁面と、一つの端面と、一つの食い付き部２１と、一つのねじ部２２と、二つの切削溝２３と、二つの切刃部２４とを備えている。 Please refer to FIG. 2 and FIG. 3 together. The shank 20 is provided at one end of the sandwiching portion 10 and extends along the axial direction of the sandwiching portion 10. The shank 20 has a circumferential wall surface, one end surface, and one biting portion 21. And one screw portion 22, two cutting grooves 23, and two cutting blade portions 24.
前記食い付き部２１は前記シャンク２０の周回壁面にて前記シャンク２０の端面近傍箇所に周回するように成型されており、前記食い付き部２１は複数本のねじ山を有している。前記ねじ部２２は前記シャンク２０の周回壁面に周回するように成型されているとともに、前記食い付き部２１と前記挟持部１０との間に位置しており、前記ねじ部２２は複数本のねじ山を有し、しかも前記ねじ部２２の直径は前記食い付き部２１の直径よりも大径となっている。 The bite portion 21 is formed to circulate around the end wall surface of the shank 20 on the circumferential wall surface of the shank 20, and the bite portion 21 has a plurality of threads. The threaded portion 22 is formed so as to circulate around the circumferential wall surface of the shank 20, and is positioned between the biting portion 21 and the clamping portion 10, and the threaded portion 22 includes a plurality of screws. In addition, the screw portion 22 has a diameter larger than the diameter of the biting portion 21.
前記二つの切削溝２３は互いが間隔を持つとともに互いに平行して軸方向に沿って前記シャンク２０の端面に凹設されており、しかも前記二つの切削溝２３は前記シャンク２０の周回壁面をそれぞれ貫通している。前記二つの切刃部２４は前記シャンク２０の端面に成型されるとともに、それぞれ前記シャンク２０の端面の中央から前記シャンク２０の端面の二つの対向する側に向かって傾斜して延在している。 The two cutting grooves 23 are spaced from each other and are recessed in the end face of the shank 20 along the axial direction in parallel with each other, and the two cutting grooves 23 are formed on the circumferential wall surface of the shank 20, respectively. It penetrates. The two cutting blade portions 24 are molded on the end face of the shank 20 and extend from the center of the end face of the shank 20 in an inclined manner toward two opposing sides of the end face of the shank 20. .
さらに図４を参照されたい。本考案の切り屑無しねじ切りタップ構造では、一枚の板材３０の下穴３１箇所の穴壁面を加工して雌ねじを形成するとき、もし前記下穴３１の穴径が所定の寸法に達していなければ、前記切刃部２４はまず前記下穴３１箇所の穴壁面を切削することで、前記下穴３１の穴径を前記切り屑無しねじ切りタップ構造で雌ねじを成型するに適した寸法まで拡大して、前記下穴３１の穴径の幅を前記食い付き部２１の直径の幅が概ね同じとすることで、前記食い付き部２１が前記シャンク２０を前記下穴３１の軸方向に沿って移動するようにスムースに案内して、後続のねじ部２２で前記下穴３１箇所の孔内壁に雌ねじを成型することが可能となっており、そして前記切削溝２３は切削時に発生した切り屑を収容可能となっている。 See further FIG. In the threadless tapping structure of the present invention, when the hole wall surface of the lower hole 31 of one plate member 30 is processed to form a female screw, the hole diameter of the lower hole 31 must reach a predetermined dimension. For example, the cutting edge portion 24 first cuts the hole wall surface of the pilot hole 31 to expand the hole diameter of the pilot hole 31 to a size suitable for molding a female screw with the chipless thread tapping structure. Thus, by setting the width of the hole diameter of the pilot hole 31 to be substantially the same as the diameter of the bite portion 21, the bite portion 21 moves the shank 20 along the axial direction of the pilot hole 31. Thus, it is possible to smoothly guide the internal thread to the inner wall of the 31 pilot holes by the subsequent screw portion 22, and the cutting groove 23 accommodates chips generated during cutting. It is possible.
本考案の切り屑無しねじ切り加工具は、上記したシャンク２０の端面に切刃部２４を形成した設計により、前記切り屑無しねじ切りタップ構造のねじ部２２を押し当て雌ねじを成型するときに受ける抵抗力を効果的に低減することで、シャンク２０が破断する不具合を減らし、ひいては切り屑無しねじ切りタップ構造の耐久性を確保すると同時に、形成された雌ねじの許容値をも確保することができる。 The chipless threading tool of the present invention has a resistance received when the internal thread is formed by pressing the threaded part 22 of the threadless tapping structure without the chip by the design in which the cutting edge part 24 is formed on the end face of the shank 20 described above. By effectively reducing the force, the failure of the shank 20 to be broken can be reduced, and as a result, the durability of the threadless tap structure without chips can be ensured, and at the same time, the tolerance of the formed female screw can be ensured.
上記は本考案の好ましい実施例に過ぎず、本考案に如何なる形式上の制限を加えるものではなく、確かに本考案ではすでに好ましい実施例で上記のように開示したものの、これは本考案を限定するためのものではなく、当業者であれば本考案の技術的思想の範囲を逸脱することなく、本考案における実質的な技術にも基づいて以上の実施例に行われる如何なる簡単な修正、同等の変化および付加は、いずれも本考案の技術的思想の範囲内に含まれる。 The above is only a preferred embodiment of the present invention, and does not add any type of limitation to the present invention. Certainly, the present invention has already been disclosed in the preferred embodiment as described above, but this limits the present invention. However, those skilled in the art will be able to make any simple modifications or equivalents made to the above embodiments based on the substantial technique of the present invention without departing from the scope of the technical idea of the present invention. Any changes and additions are included within the scope of the technical idea of the present invention.
１０挟持部
２０シャンク
２１食い付き部
２２ねじ部
２３切削溝
２４切刃部
３０板材
３１下穴
10 clamping part 20 shank 21 biting part 22 thread part 23 cutting groove 24 cutting edge part 30 plate material 31 pilot hole
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012006788U JP3181703U (en) | 2012-11-07 | 2012-11-07 | Chipless threading tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012006788U JP3181703U (en) | 2012-11-07 | 2012-11-07 | Chipless threading tool |
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| JP3181703U true JP3181703U (en) | 2013-02-21 |
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