JP3822572B2 - Torque-reducing tap - Google Patents
Torque-reducing tap Download PDFInfo
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- JP3822572B2 JP3822572B2 JP2003072954A JP2003072954A JP3822572B2 JP 3822572 B2 JP3822572 B2 JP 3822572B2 JP 2003072954 A JP2003072954 A JP 2003072954A JP 2003072954 A JP2003072954 A JP 2003072954A JP 3822572 B2 JP3822572 B2 JP 3822572B2
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- raised
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Description
【０００１】
【発明の属する技術分野】
本発明は、雌ねじの塑性加工用の盛上げタップに関するものである。
【０００２】
【従来の技術】
従来の盛上げタップは、外径部が先細りのテーパ状になっている食付き部とこれに連続する平行ねじ部とを有し、その食付き部および平行ねじ部のねじは、図４に示すように、当該盛上げタップの周方向に等間隔に凸部形状を持ち、その凸部形状は、盛り上げを安定させるために付けられる有効径一定半径の真円部（マージン）１１と、盛上げ部１２と、逃げ部１３とで構成され、盛上げ部１２と逃げ部１３のタップ回転角度に対する半径の変化量が同じになっている。
【０００３】
図５はタップの回転角度とねじの有効径の関係をグラフ化したものであり、凸部は左右対称となっている。
【０００４】
【発明が解決しようとする課題】
しかしながら、前述した従来の盛上げタップは、真円部（マージン）での接触面積により摩擦抵抗が大きくなり、ねじ加工トルクが大きくなる現象が生じていた。
【０００５】
また、加工トルクが大きくなると発熱も大きくなり、タップに溶着が発生してタップの寿命を低下させる原因にもなっていた。
【０００６】
本発明は以上の事情を背景として試されたもので、従来の盛上げタップの凸部に真円部を無くす事により、タップとめねじとの摩擦抵抗を低減し、加工トルクを低減することにより高寿命の盛上げタップを提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記目的を達成するため、本発明の盛上げタップは、外径部が先細りのテーパ状になっている食付き部とこれに連続する平行ねじ部とを有し、前記食付き部および前記平行ねじ部のねじが当該盛上げタップの周方向に等間隔に凸部形状を持つ盛上げタップにおいて、前記凸部形状を、雌ねじの盛り上げ時の前記盛上げタップの回転方向と逆の周方向に順次に連なる、それぞれの軸線方向位置での有効径最大半径に向かって１１度〜１６度の盛上げ角で周方向に拡径する盛上げ部と、前記有効径最大半径から２度〜７度の逃げ角で直線的に周方向に縮径する盛上げ安定部と、前記盛上げ安定部から５．５度〜１６度の逃げ角で周方向に縮径する逃げ部とにより構成したことを特長としており、本願発明によれば、このように従来の技術の凸部形状の真円部に相当する盛上げ安定部に、盛り上げ精度を安定させるために真円部１１の効果を生み出せる範囲内において２度〜７度の弱い逃げを直線的に付けることにより、接触面積を少なくして摩擦抵抗を低減し、加工トルクを低減するとともにめねじ加工の安定性を得ることができる。
【０００８】
【発明の実態の形態】
以下、本発明の実施の形態を、図２〜図３に基づいて説明する。この実施の形態は前述した本発明の作用・効果を奏するものである。
【０００９】
本発明に係る盛上げタップもその食付き部および平行ねじ部のねじは、図２に示すように、当該盛上げタップの周方向に等間隔に凸部形状を持ち、本発明ではその凸部形状において、雌ねじの盛り上げ時の当該盛上げタップの回転方向（図２では反時計方向）と逆の周方向に順次に連なる盛上げ部６と盛上げ安定部５と逃げ部７とを設け、盛上げ部６の盛上げ角９を１１度〜１６度程度とし、盛上げ安定部５の逃げ角８を２度〜５度程度とし、その後の逃げ部７の逃げ角１０を盛上げ角９と同じから半分程度とする。
【００１０】
上記の盛上げ角９は従来の盛上げタップでも８度〜１４度程度になっていたが、１１度〜１６度程度と強めに設定することにより接触面積を狭くして摩擦抵抗を低減している。
【００１１】
また、上記の凸部形状の盛上げ安定部５は盛り上げられためねじの弾性変形量で締め付けられ摩擦抵抗となっている部分であるが、逃げ角８を２度〜５度程度直線的に付けることにより盛り上げの安定性を確保しながら摩擦抵抗を低減している。
【００１２】
また、逃げ角１０は盛り上げ角９と同じ逃げ角度でも良いが、半分程度までの角度の間で弱くして凸部強度を向上させることができる。
【００１３】
【実施例】
以下、本発明の実施例について説明する。この実施例はＭ６のもので、図１は本実施例のトルク低減盛上げタップの全体を示す正面図、図２は本実施例の盛上げタップの凸部形状が一周で４箇所の場合のねじ断面形状の拡大説明図であり、図３は本実施例の盛上げタップの回転角度とねじの有効径の関係をグラフ化したものである。
【００１４】
図２に示すように本実施例では、盛上げ安定部５の逃げ角を約３度、盛上げ部６の盛上げ角を約１３度、そして逃げ部７の逃げ角を約１３度にしたもので凸部が構成されている。
【００１５】
以上、図示例に基づき説明したが、本発明は上記実施例に限定されるものでなく、本発明の趣旨を逸脱しない範囲で、凸部形状数の各種変更が可能であり、盛上げ安定部は直線的に変化する形状に限定されるが、盛上げ部や逃げ部は直線的に変化する形状から円弧的に変化する形状等への各種変更が可能であることはいうまでもない。
【００１６】
また、本発明は従来の技術である油溝が付いているものや表面処理を行うものにも適用できることはいうまでもない。
【００１７】
同期送りの機械においては、めねじの安定性が機械的に向上するため、盛上げ安定部５の逃げ角を７度程度まで強くすることも可能である。
【００１８】
更に、凸部形状がスパイラル状に配置される盛上げタップ等の従来の技術の盛上げタップにも適用できる事はいうまでもない。
【００１９】
【発明の効果】
以上説明したように本発明の盛上げタップは、トルクを低減することができ、その結果としてタップの溶着を抑制し工具寿命を延ばすことができる。
【００２０】
実施例のＭ６において、盛上げ安定部５の逃げ角８を３度としたものと、従来技術の真円部１１の０度（真円）とで比較した試験結果は表１に示す通りであり、従来技術品より本発明技術品が２５％程度加工トルクを低減できた。ただし、盛上げタップにはＴＩＣＮの表面処理を施してあり、加工条件は以下に示す通りである。
使用機械：ボール盤（寿命試験はタッピングセンタ）
加工速度：１０ｍ／ｍｉｎ
ワーク材質：Ｓ５０Ｃ
下穴径：５．５３ｍｍ
水溶性油剤使用
【００２１】
【表１】
また、加工トルクが低減したことにより、溶着も少なくなり表１に示す通り寿命としても３０％程度向上できた。
【図面の簡単な説明】
【図１】 本発明の実施例に係るトルク低減盛上げタップを示す正面図である。
【図２】 本発明の実施例の凸部形状が盛上げ部と盛上げ安定部と逃げ部より構成されている状態を示す盛上げタップのねじ断面形状の拡大説明図である。
【図３】 本発明の実施例の凸部形状の盛上げ安定部に弱い逃げを付けた状態を示す盛上げタップの回転角度とねじの有効径の関係をグラフ化した説明図である。
【図４】 従来技術の盛上げタップのねじ断面形状の拡大説明図である。
【図５】 従来技術の盛上げタップの回転角度とねじの有効径の関係をグラフ化した説明図である。
【符号の説明】
１：盛上げタップ
２：ねじ部
３：食付き部
４：平行ねじ部
５：本発明の実施例の凸部形状の盛上げ安定部
６：本発明の実施例の凸部形状の盛上げ部
７：本発明の実施例の凸部形状の逃げ部
８：本発明の実施例の凸部形状の盛上げ安定部の逃げ角
９：本発明の実施例の凸部形状の盛上げ角
１０：本発明の実施例の凸部形状の逃げ角
１１：従来技術の凸部形状の真円部（マージン）
１２：従来技術の凸部形状の盛上げ部
１３：従来技術の凸部形状の逃げ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a raised tap for plastic working of an internal thread.
[0002]
[Prior art]
The conventional raised tap has a biting portion having a tapered outer diameter portion and a parallel thread portion continuous therewith, and the screw of the biting portion and the parallel screw portion is shown in FIG. as such, the thread forming has equally spaced convex shape in the circumferential direction of the tap, the convex shape is a true circle of the effective diameter constant radius to be attached to stabilize (margin) 11 raised, the
[0003]
FIG. 5 is a graph showing the relationship between the rotation angle of the tap and the effective diameter of the screw, and the convex portions are symmetrical.
[0004]
[Problems to be solved by the invention]
However, the above-described conventional raised tap has a phenomenon in which the frictional resistance increases due to the contact area at the perfect circle (margin) and the threading torque increases.
[0005]
Further, when the processing torque is increased, heat generation is also increased, which causes welding on the tap and shortens the life of the tap.
[0006]
The present invention has been tried against the background described above. By eliminating the round part on the convex part of the conventional raised tap, the friction resistance between the tap and the female screw is reduced, and the processing torque is reduced. The object is to provide a life-swelling tap.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the raised tap of the present invention has a biting portion whose outer diameter portion is tapered and a parallel thread portion continuous therewith, the biting portion and the parallel screw. In the raised tap having convex portions at equal intervals in the circumferential direction of the raised tap, the convex portion shape is successively connected in the circumferential direction opposite to the rotating direction of the raised tap when the female screw is raised, A raised portion that expands in the circumferential direction at a raised angle of 11 degrees to 16 degrees toward an effective diameter maximum radius at each axial position, and a straight line with a clearance angle of 2 degrees to 7 degrees from the effective radius maximum radius in the circumferential direction to diameter thread forming stable unit, it has a feature that it has constituted by a relief portion reduced in diameter from the buildup stabilizer circumferentially relief angle of 5.5 degrees to 16 degrees, according to the present invention In this way, the convex shape of the conventional technology The stabilizer buildup corresponds to a perfect circle section of, by attaching the weak escape twice to 7 degrees linearly in the range they can deliver the effect of
[0008]
[Form of the present invention]
Hereinafter, the embodiments of the present invention will be described with reference to FIGS. 2-3. This embodiment has the functions and effects of the present invention described above.
[0009]
As shown in FIG. 2, the raised tap according to the present invention and the screw of the biting portion and the parallel threaded portion have convex shapes at equal intervals in the circumferential direction of the raised tap. sequentially a
[0010]
Although the above-described climax angle 9 is about 8 to 14 degrees even with a conventional climax tap, the contact area is narrowed to reduce the frictional resistance by setting it to a strong level of about 11 to 16 degrees .
[0011]
In addition, the raised
[0012]
Further, the clearance angle 10 may be the same clearance angle as the raised angle 9, but it can be weakened between about half of the angles to improve the convex portion strength.
[0013]
【Example】
Examples of the present invention will be described below. The examples are given M6, Fig. 1 is a front view showing an entire torque reduction thread forming tap of the embodiment, the screw section of the
[0014]
As shown in FIG. 2, in this embodiment, the relief angle of the raised
[0015]
As mentioned above, although explained based on the example of illustration, the present invention is not limited to the above-mentioned example, various changes of the number of convex part shape are possible in the range which does not deviate from the meaning of the present invention. Although the shape is limited to a linearly changing shape, it goes without saying that the raised portion and the relief portion can be variously changed from a linearly changing shape to a circularly changing shape.
[0016]
Needless to say, the present invention can also be applied to a conventional technique having an oil groove or a surface treatment.
[0017]
In the synchronous feed machine, since the stability of the female screw is mechanically improved, the clearance angle of the rising and stabilizing
[0018]
Furthermore, it cannot be overemphasized that it can apply also to the raising tap of conventional techniques, such as a raising tap in which convex part shape is arranged in spiral.
[0019]
【The invention's effect】
As described above, the raised tap of the present invention can reduce the torque, and as a result, can suppress the welding of the tap and extend the tool life.
[0020]
In M6 embodiments, and those with 3
Machine used: Drilling machine (Life test is tapping center)
Processing speed: 10m / min
Work material: S50C
Pilot hole diameter: 5.53 mm
Uses water-soluble oils. [0021]
[Table 1]
In addition, since the processing torque was reduced, welding was reduced and the lifetime was improved by about 30% as shown in Table 1.
[Brief description of the drawings]
FIG. 1 is a front view showing a torque reduction boosting tap according to an embodiment of the present invention.
Figure 2 is an enlarged view of the thread cross-sectional shape of the thread forming tap showing a state where the convex shape is formed from the stable portion and the escape portion buildup and buildup of embodiments of the present invention.
FIG. 3 is a graph illustrating the relationship between the rotation angle of a raised tap and the effective diameter of a screw, showing a state in which a weak relief is attached to a raised stable portion of a convex shape according to an embodiment of the present invention.
FIG. 4 is an enlarged explanatory view of a thread cross-sectional shape of a conventional tap.
FIG. 5 is a graph illustrating the relationship between the rotation angle of a conventional tap and the effective diameter of a screw.
[Explanation of symbols]
1: Raised tap 2: Threaded portion 3: Chamfered portion 4: Parallel threaded portion 5: Convex- shaped raised stable portion of the embodiment of the present invention 6: Convex- shaped raised portion of the embodiment of the present invention 7: Book example of convex shape of the
12: Conventional convex- shaped raised portion 13: Conventional convex- shaped relief portion
Claims (1)
前記食付き部および前記平行ねじ部のねじが当該盛上げタップの周方向に等間隔に凸部形状を持つ盛上げタップにおいて、
前記凸部形状を、雌ねじの盛り上げ時の前記盛上げタップの回転方向と逆の周方向に順次に連なる、それぞれの軸線方向位置での有効径最大半径に向かって１１度〜１６度の盛上げ角で周方向に拡径する盛上げ部と、前記有効径最大半径から２度〜７度の逃げ角で直線的に周方向に縮径する盛上げ安定部と、前記盛上げ安定部から５．５度〜１６度の逃げ角で周方向に縮径する逃げ部とにより構成したことを特長とする盛上げタップ。The outer diameter portion has a tapered portion with a tapered shape and a parallel thread portion continuous therewith,
In the raised tap having convex portions at equal intervals in the circumferential direction of the raised tap, the screw of the biting portion and the parallel screw portion,
The convex shape is formed in a rising angle of 11 degrees to 16 degrees toward the maximum radius of the effective diameter at each axial position, which is successively connected in the circumferential direction opposite to the rotation direction of the rising tap when the female screw is raised. A raised portion that expands in the circumferential direction, a raised stable portion that linearly shrinks in the circumferential direction at a clearance angle of 2 to 7 degrees from the effective radius maximum radius, and 5.5 to 16 from the raised stable portion A rising tap characterized by comprising a relief part that shrinks in the circumferential direction with a relief angle of degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003072954A JP3822572B2 (en) | 2003-03-18 | 2003-03-18 | Torque-reducing tap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003072954A JP3822572B2 (en) | 2003-03-18 | 2003-03-18 | Torque-reducing tap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004276085A JP2004276085A (en) | 2004-10-07 |
| JP3822572B2 true JP3822572B2 (en) | 2006-09-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003072954A Expired - Lifetime JP3822572B2 (en) | 2003-03-18 | 2003-03-18 | Torque-reducing tap |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3822572B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019229932A1 (en) | 2018-05-31 | 2019-12-05 | オーエスジー株式会社 | Thread-forming tap |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006159363A (en) * | 2004-12-09 | 2006-06-22 | Yamawa Seiki Kogyo Kk | Cold forming tap |
| JP5456042B2 (en) * | 2009-07-07 | 2014-03-26 | オーエスジー株式会社 | Raising tap |
| KR20120131022A (en) * | 2011-05-24 | 2012-12-04 | 김영좌 | Thread rolling tap |
| WO2013190700A1 (en) | 2012-06-22 | 2013-12-27 | オーエスジー株式会社 | Thread-forming tap |
-
2003
- 2003-03-18 JP JP2003072954A patent/JP3822572B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019229932A1 (en) | 2018-05-31 | 2019-12-05 | オーエスジー株式会社 | Thread-forming tap |
| KR20200125712A (en) | 2018-05-31 | 2020-11-04 | 오에스지 가부시키가이샤 | Thread forming tab |
| US11986896B2 (en) | 2018-05-31 | 2024-05-21 | Osg Corporation | Thread forming tap |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004276085A (en) | 2004-10-07 |
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