JP4685988B2 - Female thread repair tool - Google Patents

Female thread repair tool Download PDF

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JP4685988B2
JP4685988B2 JP2004308591A JP2004308591A JP4685988B2 JP 4685988 B2 JP4685988 B2 JP 4685988B2 JP 2004308591 A JP2004308591 A JP 2004308591A JP 2004308591 A JP2004308591 A JP 2004308591A JP 4685988 B2 JP4685988 B2 JP 4685988B2
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diameter
thread
female screw
screw
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JP2006116668A (en
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秀高 伊藤
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OSG Corp
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Description

本発明は、めねじに螺合されることによりそのめねじのねじ山を修整するめねじ手直し用工具に関するものである。   The present invention relates to a female screw retouching tool for adjusting a thread of a female screw by being screwed to the female screw.

溶接固定されためねじにスパッタが付着するなどしておねじを螺合することができなかったり、めねじにおねじを螺合する際に食い付いてめねじのねじ山が潰れたりした場合には、例えば特許文献１等に記載の通常の切削タップを用いて再度めねじのねじ立て加工を行い、めねじのねじ山を修整するようにしているのが普通である。
実用新案登録第３００５７４１号公報 If the screw cannot be screwed because it is fixed by welding and spatter adheres to the screw, or if the screw thread bites into the female screw and the female screw thread is crushed In general, for example, a tapping process of a female screw is performed again by using a normal cutting tap described in Patent Document 1 or the like to correct the thread of the female screw.
Utility Model Registration No. 3005741

ところで、このようなめねじの修整作業は、電動式やエア駆動式等のハンドドライバーを用いて手作業で行なわれ、切削タップとめねじとの螺合の進行に伴ってハンドドライバーを送り込みながら切削タップをめねじに螺入する必要があるが、そのハンドドライバーの送りがずれると、タップの切れ刃がめねじに食い付いてねじ山が痩せたりタップが折損したりすることがあり、作業に熟練を要するという問題があった。   By the way, such a female screw retouching operation is performed manually using an electric or air-driven hand driver, and the cutting tap is fed while the hand driver is fed along with the progress of screwing between the cutting tap and the female screw. It is necessary to screw into the female screw, but if the feed of the hand driver is shifted, the cutting edge of the tap may bite into the female screw and the thread may be thinned or the tap may be broken. There was a problem that it took.

本発明は以上の事情を背景として為されたもので、その目的とするところは、熟練を要することなくハンドドライバー等を用いてめねじのねじ山を容易に修整することができるめねじ手直し用工具を提供することにある。   The present invention has been made against the background of the above circumstances, and the purpose of the present invention is to repair a female screw that can be easily modified using a hand driver or the like without requiring skill. To provide a tool.

かかる目的を達成するために、第１発明は、めねじに螺合されることによりそのめねじのねじ山を修整するめねじ手直し用工具であって、(a) 前記めねじと同じピッチの修整用おねじを有するとともに、(b) その修整用おねじの外径、有効径、および谷の径は、それぞれ前記めねじに螺合される組付おねじの公差の下限値より大きく且つその組付おねじの基準山形よりも小さいことを特徴とする。   In order to achieve such an object, the first invention is a female screw retouching tool for adjusting a thread of a female screw by being screwed to the female screw, and (a) a modification having the same pitch as that of the female screw. (B) the outer diameter, the effective diameter, and the root diameter of the modification male screw are larger than the lower limit value of the tolerance of the assembled male screw to be screwed into the female screw, respectively. It is characterized by being smaller than the standard angle of the assembled male screw.

ここで、上記外径、有効径、谷の径は何れも直径で、公差の下限値は、組付おねじについてＪＩＳ等の規格で定められた外径、有効径、谷の径の各々の最小許容寸法であり、修整用おねじの外径、有効径、および谷の径は、何れもその最小許容寸法より大きいのである。また、組付おねじの基準山形は、同じくＪＩＳ等の規格で定められているもので、外径の基準寸法、有効径の基準寸法、および谷の径の基準寸法についてそれぞれ規定されており、修整用おねじの外径、有効径、および谷の径は、何れもその基準寸法より小さいのである。上記第１発明は請求項１に記載の発明に相当する。 Here, the outer diameter, the effective diameter, and the valley diameter are all diameters, and the lower limit value of the tolerance is the outer diameter, the effective diameter, and the valley diameter defined by the standards such as JIS for the assembled male screw. This is the minimum allowable dimension, and the outer diameter, effective diameter, and trough diameter of the modification male screw are all larger than the minimum allowable dimension. In addition, the standard thread shape of the assembled male thread is also defined by standards such as JIS, etc., and is defined for the standard diameter of the outer diameter, the standard dimension of the effective diameter, and the standard dimension of the valley diameter, The external diameter, effective diameter, and trough diameter of the modifying male screw are all smaller than the reference dimension. The first invention corresponds to the invention described in claim 1.

第２発明は、第１発明のめねじ手直し用工具において、前記修整用おねじの外径、有効径、および谷の径は、それぞれ前記組付おねじの公差の上限値以下で、且つ、その外径および有効径は〔その上限値−６０μｍ〕以上であることを特徴とする。   The second invention is the female screw rework tool according to the first invention, wherein the external diameter, effective diameter, and trough diameter of the male screw for modification are each not more than the upper limit of the tolerance of the assembled male screw, and The outer diameter and the effective diameter are not less than [the upper limit value−60 μm].

すなわち、上記公差の上限値は、組付おねじについてＪＩＳ等の規格で定められた外径、有効径、谷の径の各々の最大許容寸法で、修整用おねじの外径、有効径、および谷の径は、何れもその最大許容寸法以下であり、外径および有効径については、それぞれその最大許容寸法から６０μｍを差し引いた径寸法以上とされるのである。なお、組付おねじの径寸法や精度、規格によっては、前記基準山形が公差の上限値（最大許容寸法）と一致する場合もある。上記第２発明は請求項２に記載の発明に相当する。 That is, the upper limit of the tolerance is the maximum allowable dimension of the outer diameter, effective diameter, and valley diameter determined by the standards of JIS etc. for the assembled male thread, and the outer diameter, effective diameter, In addition, the diameter of the valley and the valley are both equal to or smaller than the maximum allowable dimension, and the outer diameter and the effective diameter are equal to or larger than the diameter dimension obtained by subtracting 60 μm from the maximum allowable dimension. Note that, depending on the diameter size, accuracy, and standard of the assembled male screw, the reference chevron may coincide with the upper limit value (maximum allowable dimension) of tolerance. The second invention corresponds to the invention described in claim 2.

第３発明は、第１発明または第２発明のめねじ手直し用工具において、前記修整用おねじは周方向において分断されて複数のランドが形成されており、そのランドの前記めねじに螺入させられるリーディング側エッジのすくい角は負とされていることを特徴とする。   According to a third aspect of the present invention, in the female screw rework tool according to the first or second aspect of the present invention, the modification male screw is divided in the circumferential direction to form a plurality of lands, and is screwed into the female screw of the land. The rake angle of the leading edge to be made negative is negative.

第４発明は、第３発明のめねじ手直し用工具において、前記リーディング側エッジにおける山頂部分のすくい角は−２０°〜−６０°の範囲内で、そのリーディング側エッジの逃げ角は０°で前記ランドの径寸法は一定であることを特徴とする。   4th invention is the internal thread screw repair tool of 3rd invention, The rake angle of the peak part in the said leading side edge is in the range of -20 degrees--60 degrees, The relief angle of the leading side edge is 0 degree. The diameter dimension of the land is constant.

第５発明は、第３発明または第４発明のめねじ手直し用工具において、複数の角部が軸心を中心とする円弧形状とされた正多角柱形状を成しており、その円弧角部が前記ランドとして機能して前記修整用おねじが設けられていることを特徴とする。   According to a fifth aspect of the invention, there is provided a female screw rework tool according to the third or fourth aspect of the present invention, wherein a plurality of corners have a regular polygonal column shape centered on an axis, and the arc corners thereof. Functions as the land, and the correction male screw is provided.

このようなめねじ手直し用工具においては、めねじと同じピッチで設けられた修整用おねじの外径、有効径、および谷の径が何れも組付おねじの基準山形（各基準寸法）より小さいため、めねじに比べて修整用おねじが小径で、めねじのねじ溝内を修整用おねじが遊びを持って通過させられるようになり、修整用おねじがめねじに食い付くことが抑制されて、めねじの修整作業を容易に行なうことができるようになる。また、修整用おねじの外径、有効径、および谷の径は、めねじに螺合される組付おねじの公差の下限値（各最小許容寸法）より大きいため、この修整用おねじがめねじに螺合されることにより、少なくとも公差の下限値付近の組付おねじについてはめねじと干渉することなく螺合でき、それより大径（公差の上限値付近など）の組付おねじについても、多少の干渉を生じる可能性はあるものの、ねじ込み不良を生じることなく螺合することができる。   In such a female screw repair tool, the external diameter, effective diameter, and trough diameter of the male thread for repair provided at the same pitch as the female thread are all from the standard thread shape (each standard dimension) of the assembled male thread. Because of its small size, the modification male screw has a smaller diameter than the female screw, and the modification male screw can pass through the thread groove of the female screw with play, and the modification male screw may bite into the female screw. As a result, the female screw can be easily repaired. In addition, the external diameter, effective diameter, and valley diameter of the male thread for modification are larger than the lower limit value (each minimum allowable dimension) of the tolerance of the assembled male thread screwed into the female thread. By screwing into the internal thread, at least the assembled male thread near the lower limit of the tolerance can be screwed in without interfering with the female thread, and the assembled male thread with a larger diameter (such as near the upper limit of the tolerance) In addition, although there is a possibility of causing some interference, it can be screwed in without causing poor screwing.

第２発明では、修整用おねじの外径、有効径、および谷の径が、組付おねじの公差の上限値（各最大許容寸法）以下で、且つ、外径および有効径は〔その上限値−６０μｍ〕以上の範囲内、すなわち組付おねじの公差の上限値付近の寸法であるため、めねじに対する食付きを抑制しつつ公差の上限値付近の組付おねじについてもめねじと殆ど干渉することなく良好に螺合できるようになる。   In the second invention, the external diameter, effective diameter, and valley diameter of the male thread for modification are not more than the upper limit of tolerance of each assembled male thread (each maximum allowable dimension), and the external diameter and effective diameter are The upper limit value is -60 μm], that is, the size is close to the upper limit value of the tolerance of the built-in male screw. It can be screwed well with almost no interference.

第３発明は、修整用おねじが周方向において分断されて複数のランドが形成されている場合で、そのランドのリーディング側エッジのすくい角が負とされているため、めねじのねじ山は主として塑性変形によって修整されるとともに、そのめねじに対する食付きが一層良好に防止され、熟練を要することなく容易に修整作業を行なうことができる。溶接時にめねじに付着したスパッタ等は、修整用おねじによって擦られることにより、塑性変形だけでなくめねじから脱落して除去される場合もあり、そのようなめねじの除去屑は、ランドの間の溝内に収容されて排出される。   The third invention is a case where the male thread for modification is divided in the circumferential direction to form a plurality of lands, and since the rake angle of the leading edge of the land is negative, the thread of the female thread is While the modification is mainly performed by plastic deformation, the biting of the female screw is further prevented, and the modification work can be easily performed without requiring skill. Spatter and the like adhering to the female screw during welding may be removed not only by plastic deformation but also from the female screw by being rubbed by the modifying male screw. It is accommodated in the groove between and discharged.

第４発明では、上記リーディング側エッジにおける山頂部分のすくい角が−２０°〜−６０°の範囲内であるため、めねじに対する食付きが一層良好に防止されるとともに、そのリーディング側エッジの逃げ角は０°でランドの径寸法は一定であるため、めねじ手直し用工具を簡単且つ安価に製造できる。   In the fourth invention, since the rake angle of the peak portion at the leading edge is within a range of −20 ° to −60 °, the biting against the female screw is further prevented, and the clearance of the leading edge is prevented. Since the angle is 0 ° and the diameter of the land is constant, a female thread retouching tool can be manufactured easily and inexpensively.

第５発明のめねじ手直し用工具は、円弧角部を有する正多角柱形状を成しており、その円弧角部がランドとして機能して修整用おねじが設けられているため、一層簡単且つ安価に製造される。   The female thread retouch tool according to the fifth aspect of the present invention has a regular polygonal column shape having an arc corner, and the arc corner functions as a land and is provided with a correction male screw. Manufactured inexpensively.

本発明のめねじ手直し用工具は、例えば電動式、エア駆動式等のハンドドライバーに取り付けて使用され、６０００ｒ／ｍｉｎ等の所定の回転速度で回転駆動しつつ、そのハンドドライバーを手で持って修整用おねじをめねじに螺入することにより、そのめねじのねじ山を修整することができる。めねじ手直し用工具は、修整用おねじと同軸にシャンク等を有して構成される。   The female thread retouching tool of the present invention is used by being attached to a hand driver such as an electric type or an air driven type, for example, and while holding the hand driver by hand while rotating at a predetermined rotational speed such as 6000 r / min. The thread of the female thread can be modified by screwing the male thread for modification into the female thread. The female thread retouching tool is configured to have a shank or the like coaxially with the modifying external thread.

修整用おねじの外径および有効径は、第２発明では組付おねじの公差の上限値以下で且つ〔その上限値−６０μｍ〕以上とされているが、第１発明の実施に際しては、組付おねじの基準山形より小さく且つ〔公差の上限値−６０μｍ〕以上の範囲内で設定しても良いなど、組付おねじの公差の下限値より大きく且つ基準山形よりも小さい範囲で適宜定めることができる。修整用おねじの谷の径についても、組付おねじの公差の上限値以下で且つ〔その上限値−６０μｍ〕以上の範囲内で設定したり、組付おねじの基準山形より小さく且つ〔公差の上限値−６０μｍ〕以上の範囲内で設定したりするなど、種々の態様が可能である。   In the second invention, the external diameter and effective diameter of the male screw for modification are not more than the upper limit value of the tolerance of the assembled male screw and not less than [the upper limit value −60 μm], but in carrying out the first invention, Appropriately within a range that is larger than the lower limit value of the tolerance of the assembled male screw and smaller than the standard shape, such as may be set within a range that is smaller than the standard thread shape of the assembled male screw and [the upper limit of tolerance-60 μm]. Can be determined. The root diameter of the male thread for modification is also set within the upper limit of the tolerance of the assembled male thread and within the range of [the upper limit value-60 μm] or smaller than the reference thread shape of the assembled male thread and [ Various modes are possible, such as setting within the range of the upper limit of tolerance −60 μm] or more.

組付おねじの外径、有効径、および谷の径については、例えばＪＩＳ Ｂ０２０９等に呼び（径寸法）および等級（精度）に応じて上限値（最大許容寸法）および下限値（最小許容寸法）がそれぞれ定められており、修整用おねじの外径、有効径、および谷の径は、このような組付おねじの規格に基づいて設定される。   For the outer diameter, effective diameter, and trough diameter of the assembled male screw, call the upper limit (maximum allowable dimension) and the lower limit (minimum allowable dimension) according to, for example, JIS B0209 (diameter dimension) and grade (accuracy). ) Are defined, and the outer diameter, effective diameter, and trough diameter of the modification external thread are set based on the standard of such assembly external threads.

修整用おねじは、例えば完全山部と外径がテーパ状に小径とされた食付き部とを有して構成されるが、完全山部だけであっても良いし、完全山部の先端に例えば４５°程度の面取りを施すだけでも良い。   For example, the male screw for modification is configured to have a complete crest and a chamfered portion whose outer diameter is tapered to a small diameter, but it may be a complete crest or a tip of a complete crest. For example, only chamfering of about 45 ° may be applied.

修整用おねじは、例えば軸方向に溝が設けられることによって分断され、１または複数のランドが形成されるが、その溝は直溝であってもねじれ溝であっても良い。第５発明の正多角柱形状の平坦な側面は直溝に相当するが、溝底が円弧形状を成す溝を設けることもできる。３〜５つのランドに分断する場合、ランド幅（中心角）は、例えば２０°〜４０°程度の範囲内とすることが望ましく、溝底径（心厚）は、修整用おねじの外径ｄに対して０．６ｄ〜０．８ｄ程度の範囲内が適当である。   The modifying external thread is divided by, for example, providing a groove in the axial direction to form one or a plurality of lands, and the groove may be a straight groove or a twisted groove. The flat side surface of the regular polygonal column shape of the fifth invention corresponds to a straight groove, but a groove having a circular arc shape at the groove bottom can also be provided. When dividing into 3 to 5 lands, the land width (center angle) is preferably in the range of about 20 ° to 40 °, for example, and the groove bottom diameter (core thickness) is the outer diameter of the male screw for modification. A range of about 0.6d to 0.8d with respect to d is appropriate.

リーディング側エッジのすくい角が負の場合、めねじは、修整用おねじが螺入されることにより主として塑性変形によって修整されるが、めねじの変形の程度やスパッタ等の付着状況、或いはすくい角の大きさによっては、切削や毟り、スパッタ等の付着物の脱落などを伴って修整される。   When the rake angle of the leading edge is negative, the female thread is modified mainly by plastic deformation when the modifying male thread is screwed in, but the degree of deformation of the female thread, the state of adhesion of spatter, etc., or the rake Depending on the size of the corner, it can be modified with cutting, turning, spattering and other deposits.

本発明の修整用おねじは、めねじに螺合してねじ山を修整した後に、逆回転させてそのめねじから引き抜く必要があるため、リーディング側エッジと反対のヒール側についても、リーディング側エッジと同様に逆回転時のすくい角が負（例えば−２０°〜−６０°）となるようにすることが望ましく、例えばリーディング側エッジと対称的に構成される。   Since the male thread for modification of the present invention needs to be reversely rotated and pulled out from the female screw after screwing into the female screw and modifying the screw thread, the heel side opposite to the leading edge is also the leading side. As with the edge, it is desirable that the rake angle during reverse rotation be negative (for example, −20 ° to −60 °), and for example, it is configured symmetrically with the leading edge.

本発明のめねじ手直し用工具は切削加工を目的としていないため、食付き部を設ける場合でも、第４発明のように逃げ角を０°としてランドの径寸法を一定とすることができるが、その食付き部や完全山部に所定の逃げを設けることも可能である。   Since the female thread retouching tool of the present invention is not intended for cutting, even when a chamfer is provided, the clearance angle can be set to 0 ° as in the fourth aspect, and the land diameter can be made constant. It is also possible to provide a predetermined relief at the biting portion or the complete mountain portion.

第５発明の正多角柱は、例えば正三角柱、正四角柱、正五角柱までが工具として好適に採用されるが、正六角柱以上の正多角柱を用いることも可能である。   As the regular polygonal column of the fifth invention, for example, a regular triangular prism, a regular quadrangular column, and a regular pentagonal column are suitably employed as tools, but it is also possible to use a regular polygonal column greater than a regular hexagonal column.

本発明のめねじ手直し用工具の工具素材としては、高速度工具鋼や合金工具鋼などのスチール、或いは超硬合金など種々の金属材料を採用できる。必要に応じてＴｉＡｌＮ等の硬質皮膜をコーティングしたり、浸炭等の表面硬化処理を施したりすることも可能である。   As the tool material of the female screw rework tool of the present invention, various metal materials such as steel such as high speed tool steel and alloy tool steel, or cemented carbide can be adopted. If necessary, it is possible to coat a hard film such as TiAlN or perform a surface hardening treatment such as carburization.

以下、本発明の実施例を図面を参照しつつ詳細に説明する。
図１は、本発明の一実施例であるめねじ手直し用工具１０を説明する図で、(a) は軸心と直角方向から見た正面図、(b) は(a) におけるＢ−Ｂ断面図、(c) はねじ山形状や公差を説明する図で軸心Ｏを含む断面に相当する図である。このめねじ手直し用工具１０は、シャンク１２およびねじ部１４を同軸上に一体に備えており、シャンク１２が例えば図２に示すエア駆動式のハンドドライバー３０の主軸に取り付けられ、軸心Ｏまわりに回転駆動されつつナット１６のめねじ１８内に螺合されることにより、そのめねじ１８のねじ山を修整するためのものである。ナット１６は、パネル２０などに溶接等によって固定されているもので、ボルト等の組付おねじを螺合する際に、スパッタの付着などで螺合することができなかったり、めねじ１８に食い付いてそのめねじ１８のねじ山が潰れたりしたものである。ハンドドライバー３０は、作業者がグリップ３２を把持して手動で移動操作するもので、めねじ手直し用工具１０とめねじ１８との螺合の進行に伴って、ハンドドライバー３０を送り込みながらめねじ手直し用工具１０をめねじ１８に螺入する必要がある一方、めねじ手直し用工具１０がめねじ１８に螺合してねじ山を修整した後は、ハンドドライバー３０を引きながらめねじ手直し用工具１０を逆回転させてめねじ１８から抜き出す必要がある。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1A and 1B are views for explaining a female screw reworking tool 10 according to an embodiment of the present invention, in which FIG. 1A is a front view seen from a direction perpendicular to the axis, and FIG. Sectional view (c) is a view for explaining the thread shape and tolerance, and is a view corresponding to a section including the axis O. The female screw reworking tool 10 includes a shank 12 and a threaded portion 14 which are coaxially integrated, and the shank 12 is attached to a main shaft of an air-driven hand driver 30 shown in FIG. The screw thread of the female screw 18 is modified by being screwed into the female screw 18 of the nut 16 while being rotationally driven. The nut 16 is fixed to the panel 20 or the like by welding or the like. When the assembled male screw such as a bolt is screwed, the nut 16 cannot be screwed due to adhesion of spatter or the like. The internal thread 18 bites and the screw thread of the female screw 18 is crushed. The hand driver 30 is one in which an operator grips the grip 32 and manually moves the hand screw 30. The hand screw 30 is fed while the hand driver 30 is being fed with the progress of the screwing of the female screw correcting tool 10 and the female screw 18. While it is necessary to screw the tool 10 into the female screw 18, the female screw repairing tool 10 is screwed into the female screw 18 to correct the thread, and then the female screw repairing tool 10 is pulled while pulling the hand driver 30. Needs to be reversely rotated and extracted from the female screw 18.

ねじ部１４には、修整用おねじ２２が設けられている。この修整用おねじ２２は、前記めねじ１８と同じピッチでねじ山が設けられているとともに、その外径ｄ、有効径ｄ2 、および谷の径ｄ1 は、ナット１６に螺合すべき組付おねじと同じ規格（ＪＩＳなど）に基づいて設定されている。具体的には、図１の(c) において、斜線で示す領域Ｅ１はめねじ１８の公差域（許容域）で、基準山形２４を下限値（最小許容寸法）として定められており、領域Ｅ２は、めねじ１８に螺合すべき組付おねじの公差域（許容域）で、基準山形２４よりも小径側に定められているが、修整用おねじ２２の外径ｄ、有効径ｄ2 、および谷の径ｄ1 は、矢印Ａで示すように、その基準山形２４より小さく且つ組付おねじの公差域Ｅ２の下限値Ｅ２min より大きい範囲内で、本実施例では公差域Ｅ２の上限値Ｅ２max 以下で且つ〔Ｅ２max −６０μｍ〕以上の範囲内で定められている。これ等の公差域Ｅ１、Ｅ２は、例えばＪＩＳ Ｂ０２０９等において呼び（径寸法）および等級（精度）に応じて定められているもので、上限値Ｅ２max は最大許容寸法に相当し、下限値Ｅ２min は最小許容寸法に相当する。また、基準山形２４は、組付おねじの基準山形に相当し、この実施例ではめねじ１８の基準山形と一致している。なお、本実施例のめねじ手直し用工具１０は、例えば呼びがＭ１０×１．２５のねじに関するものである。 The threaded portion 14 is provided with a modification male screw 22. The external thread 22 for modification is threaded at the same pitch as the internal thread 18, and its outer diameter d, effective diameter d 2 , and trough diameter d 1 should be screwed into the nut 16. It is set based on the same standard (JIS etc.) as the assembly male screw. Specifically, in FIG. 1 (c), the area E1 indicated by the oblique line is the tolerance area (allowable area) of the internal thread 18, and the reference angle 24 is defined as the lower limit (minimum allowable dimension). The outer diameter d and the effective diameter d 2 of the male screw 22 for modification are defined in the tolerance range (allowable range) of the assembled male screw to be screwed to the female screw 18 and smaller than the reference angle 24. As shown by the arrow A, the diameter d 1 of the valley is smaller than the reference chevron 24 and larger than the lower limit E2min of the tolerance range E2 of the assembled male screw. In this embodiment, the upper limit of the tolerance range E2 It is determined within the range of not more than the value E2max and not less than [E2max−60 μm]. These tolerance areas E1 and E2 are determined according to the nominal (diameter dimension) and grade (accuracy) in, for example, JIS B0209, and the upper limit value E2max corresponds to the maximum allowable dimension, and the lower limit value E2min is Corresponds to the minimum allowable dimension. Further, the reference angle 24 corresponds to the reference angle of the assembled male screw, and in this embodiment coincides with the reference angle of the internal thread 18. Note that the female screw rework tool 10 of the present embodiment relates to a screw having a nominal size of M10 × 1.25, for example.

ここで、めねじ１８を加工するためのタップは、めねじ１８の公差域Ｅ１の範囲内で定められているが、同じタップを用いてめねじ１８の修整作業を行なうと、遊びが無いため、タップがめねじ１８のフランクに食い付いてねじ山が痩せたりタップが折損したりすることがあり、作業に熟練を要する。また、めねじ１８の山痩せなどでナット１６が使用不可になると、パネル２０を含めて一式交換する必要があり、工数が増えてコスト高の原因になる。このため、本実施例では、組付おねじの公差域Ｅ２の範囲内の修整用おねじ２２を有する手直し専用のめねじ手直し用工具１０を用意し、その修整用おねじ２２が遊びを持ってめねじ１８に螺合されることにより、容易にめねじ１８を修整できるようにしたのである。   Here, the tap for processing the internal thread 18 is determined within the tolerance range E1 of the internal thread 18, but there is no play when the internal thread 18 is repaired using the same tap. The tap may bite into the flank of the female screw 18 and the thread may be thinned or the tap may be broken. Further, if the nut 16 becomes unusable due to a bevel of the internal thread 18 or the like, it is necessary to replace the entire set including the panel 20, which increases the number of steps and causes a cost increase. For this reason, in this embodiment, a female screw retouching tool 10 is prepared which has a retouching male screw 22 within the tolerance range E2 of the assembling male screw, and the retouching male screw 22 has play. By being screwed onto the female screw 18, the female screw 18 can be easily modified.

前記ねじ部１４は、完全山部と外径ｄがテーパ状に小径とされた約５山の食付き部とから構成されているとともに、図１の(b) から明らかなように、軸心Ｏまわりに等角度間隔で４本の直溝２６が設けられて、前記修整用おねじ２２が４つのランド２８に分断されている。直溝２６は、溝底が円弧形状を成すもので、その半径Ｒは前記外径ｄに対して０．４ｄ程度、ランド２８のランド幅（中心角）γは約３０°、溝底径ｄM は０．７ｄ程度、リーディング側エッジ２８ａの山頂部分のすくい角θは約−３０°である。また、リーディング側エッジ２８ａの逃げ角は食付き部を含めて０°で、ランド２８は周方向においてリーディング側エッジ２８ａからヒール２８ｂに至るまで一定の径寸法で設けられており、ヒール２８ｂは、軸心Ｏまわりにおいてリーディング側エッジ２８ａと対称的に構成されている。図１の(b) は、修整用おねじ２２のねじ山に沿って切断した断面図である。 The screw portion 14 is composed of a complete crest portion and a chamfered portion of about 5 crests whose outer diameter d is tapered to a small diameter, and as is apparent from FIG. Four straight grooves 26 are provided at equal angular intervals around O, and the modification male screw 22 is divided into four lands 28. The straight groove 26 has an arc-shaped groove bottom, the radius R of which is about 0.4d with respect to the outer diameter d, the land width (center angle) γ of the land 28 is about 30 °, and the groove bottom diameter d. M is about 0.7 d, and the rake angle θ of the peak portion of the leading edge 28a is about −30 °. The clearance angle of the leading side edge 28a is 0 ° including the chamfered portion, the land 28 is provided with a constant diameter from the leading side edge 28a to the heel 28b in the circumferential direction, and the heel 28b is Around the axis O, it is configured symmetrically with the leading edge 28a. FIG. 1B is a cross-sectional view taken along the thread of the modification male screw 22.

そして、このようなめねじ手直し用工具１０によれば、めねじ１８と同じピッチで設けられた修整用おねじ２２の外径ｄ、有効径ｄ2 、および谷の径ｄ1 が組付おねじの基準山形２４よりも小さく、本実施例では組付おねじの公差の上限値Ｅ２max 以下とされているため、めねじ１８に比べて修整用おねじ２２が小径で、めねじ１８のねじ溝内を修整用おねじ２２が遊びを持って通過させられるようになり、修整用おねじ２２がめねじ１８に食い付くことが抑制されて、めねじ１８の修整作業を容易に行なうことができるようになる。 According to the female screw repairing tool 10 as described above, the external diameter d, the effective diameter d 2 , and the trough diameter d 1 of the modifying external thread 22 provided at the same pitch as the internal thread 18 are the assembled external threads. In this embodiment, since the tolerance is smaller than the upper limit value E2max of the assembled male screw, the modification male screw 22 has a smaller diameter than the female screw 18 and the thread groove of the female screw 18 is smaller. The modification male screw 22 is allowed to pass therethrough with play, and the modification male screw 22 is prevented from biting into the female screw 18 so that the female screw 18 can be easily modified. become.

また、修整用おねじ２２の外径ｄ、有効径ｄ2 、および谷の径ｄ1 は、めねじ１８に螺合される組付おねじの公差の下限値Ｅ２min より大きく、本実施例では上限値Ｅ２max から６０μｍを差し引いた径寸法〔Ｅ２max −６０μｍ〕以上であるため、結局修整用おねじ２２は組付おねじの公差の上限値Ｅ２max 付近の寸法とされ、この修整用おねじ２２がめねじ１８に螺合されてそのめねじ１８のねじ山が修整されると、公差の下限値Ｅ２min 付近の組付おねじは勿論、公差の上限値Ｅ２max 付近の組付おねじについても、めねじ１８と殆ど干渉することなく良好に螺合できるようになる。 Further, the outer diameter d, the effective diameter d 2 , and the valley diameter d 1 of the modification male screw 22 are larger than the lower limit value E2min of the tolerance of the assembled male screw screwed to the female screw 18, and in this embodiment, Since the diameter is obtained by subtracting 60 μm from the upper limit E2max [E2max −60 μm] or more, the modification male screw 22 is eventually set to a size near the upper limit E2max of the tolerance of the assembled male screw. When the thread of the female screw 18 is adjusted by being screwed onto the screw 18, not only the assembled male screw near the lower limit value E2min of the tolerance but also the assembled male screw near the upper limit value E2max of the female Thus, it can be screwed in well with almost no interference.

また、本実施例ではランド２８のリーディング側エッジ２８ａのすくい角θが−３０°程度とされているため、めねじ１８のねじ山は主として塑性変形によって修整されるとともに、そのめねじ１８に対する修整用おねじ２２の食付きが一層良好に防止され、熟練を要することなく容易に修整作業を行なうことができる。溶接時にめねじ１８に付着したスパッタ等は、修整用おねじ２２によって擦られることにより、塑性変形だけでなくめねじ１８から脱落して除去される場合もあり、そのようなめねじの除去屑は直溝２６内に収容されて排出される。   In the present embodiment, since the rake angle θ of the leading edge 28a of the land 28 is about −30 °, the thread of the female screw 18 is modified mainly by plastic deformation, and the female screw 18 is modified. The biting of the male screw 22 can be prevented more satisfactorily, and the repair work can be easily performed without requiring skill. Spatter and the like adhering to the internal thread 18 during welding may be removed not only by plastic deformation but also falling off the internal thread 18 by being rubbed by the modifying external thread 22. It is accommodated in the straight groove 26 and discharged.

また、本実施例ではリーディング側エッジ２８ａの逃げ角が食付き部を含めて０°で、ランド２８は一定の径寸法で設けられるため、めねじ手直し用工具１０を簡単且つ安価に製造できる。   Further, in this embodiment, the clearance angle of the leading edge 28a is 0 ° including the chamfered portion, and the land 28 is provided with a constant diameter, so that the internal thread repair tool 10 can be manufactured easily and inexpensively.

なお、上記実施例ではねじ部１４の先端に食付き部が設けられていたが、図３に示すように食付き部を省略し、完全山部の先端に４５°程度の面取り４０を施すだけでも良い。   In the above embodiment, the chamfered portion is provided at the tip of the screw portion 14, but the chamfered portion is omitted as shown in FIG. But it ’s okay.

また、図４の(a) 〜(c) は、前記ねじ部１４の形状が異なる場合で、何れも前記図１(b) に相当する断面図であり、食付き部の有無については図１(a) 或いは図３のように適宜定められる。図４の(a) のねじ部４２は、略正四角柱形状を成しているとともに、４つの角部が軸心Ｏを中心とする円弧形状とされており、その円弧角部がランド４４として機能して前記修整用おねじ２２が設けられている。この場合の４つの側面４６は、溝底が平坦な４本の直溝に相当し、ランド４４のランド幅（中心角）γは約２０°、溝底径ｄM は０．８ｄ程度、リーディング側エッジ４４ａの山頂部分のすくい角θは約−５５°である。また、リーディング側エッジ４４ａの逃げ角は０°で、ランド４４は周方向においてリーディング側エッジ４４ａからヒール４４ｂに至るまで一定の径寸法で設けられており、ヒール４４ｂは、軸心Ｏまわりにおいてリーディング側エッジ４４ａと対称的に構成されている。本実施例では、前記実施例と同様の作用効果が得られるのに加えて、ねじ部４２が略正多角柱形状を成していて、その円弧角部がランド４４として機能して修整用おねじ２２が設けられるため、一層簡単且つ安価に製造される。 4 (a) to 4 (c) are cross-sectional views corresponding to FIG. 1 (b) when the shape of the screw portion 14 is different. (a) Or it is determined appropriately as shown in FIG. 4A has a substantially regular quadrangular prism shape, and the four corners have an arc shape with the axis O as the center, and the arc corners serve as lands 44. The above-described modification male screw 22 is provided. The four side surfaces 46 in this case correspond to four straight grooves having a flat groove bottom, the land width (center angle) γ of the land 44 is about 20 °, and the groove bottom diameter d M is about 0.8d. The rake angle θ of the peak portion of the side edge 44a is about −55 °. The clearance angle of the leading edge 44a is 0 °, and the land 44 is provided with a constant diameter from the leading edge 44a to the heel 44b in the circumferential direction. The heel 44b is leading around the axis O. It is configured symmetrically with the side edge 44a. In the present embodiment, in addition to the same effects as those of the previous embodiment, the screw portion 42 has a substantially regular polygonal column shape, and the arc corner portion functions as a land 44 for modification. Since the screw 22 is provided, the screw 22 is manufactured more easily and inexpensively.

図４の(b) のねじ部５０は、略正三角柱形状を成しているとともに、３つの角部が軸心Ｏを中心とする円弧形状とされており、その円弧角部がランド５２として機能して前記修整用おねじ２２が設けられている。この場合の３つの側面５４は、溝底が平坦な３本の直溝に相当し、ランド５２のランド幅（中心角）γは約３０°、溝底径ｄM は０．７ｄ程度、リーディング側エッジ５２ａの山頂部分のすくい角θは約−４５°である。また、リーディング側エッジ５２ａの逃げ角は０°で、ランド５２は周方向においてリーディング側エッジ５２ａからヒール５２ｂに至るまで一定の径寸法で設けられており、ヒール５２ｂは、軸心Ｏまわりにおいてリーディング側エッジ５２ａと対称的に構成されている。この場合も、上記図４(a) の実施例と同様の作用効果が得られる。 The threaded portion 50 in FIG. 4B has a substantially regular triangular prism shape, and has three corners in an arc shape with the axis O as the center, and the arc corners serve as lands 52. The above-described modification male screw 22 is provided. In this case, the three side surfaces 54 correspond to three straight grooves having a flat groove bottom, the land width (center angle) γ of the land 52 is about 30 °, the groove bottom diameter d M is about 0.7 d, and leading The rake angle θ of the peak portion of the side edge 52a is about −45 °. The clearance angle of the leading edge 52a is 0 °, and the land 52 is provided with a constant diameter from the leading edge 52a to the heel 52b in the circumferential direction. The heel 52b is leading around the axis O. It is configured symmetrically with the side edge 52a. Also in this case, the same effect as the embodiment of FIG. 4 (a) can be obtained.

図４の(c) のねじ部６０は、溝底が円弧形状を成す３本の直溝６２により３つのランド６４が設けられている場合で、そのランド６４に前記修整用おねじ２２が設けられている。ランド６４のランド幅（中心角）γは約３０°、溝底径ｄM は０．６ｄ程度、リーディング側エッジ６４ａの山頂部分のすくい角θは約−２０°である。また、リーディング側エッジ６４ａの逃げ角は０°で、ランド６４は周方向においてリーディング側エッジ６４ａからヒール６４ｂに至るまで一定の径寸法で設けられており、ヒール６４ｂは、軸心Ｏまわりにおいてリーディング側エッジ６４ａと対称的に構成されている。この場合は、前記図１の実施例と同様の作用効果が得られる。 4 (c) is a case where three lands 64 are provided by three straight grooves 62 having a groove bottom having an arc shape, and the modification male screw 22 is provided on the land 64. As shown in FIG. It has been. The land width (center angle) γ of the land 64 is about 30 °, the groove bottom diameter d M is about 0.6d, and the rake angle θ of the peak portion of the leading edge 64a is about −20 °. Further, the clearance angle of the leading edge 64a is 0 °, and the land 64 is provided with a constant diameter from the leading edge 64a to the heel 64b in the circumferential direction, and the heel 64b is leading around the axis O. It is configured symmetrically with the side edge 64a. In this case, the same effect as the embodiment of FIG. 1 can be obtained.

以上、本発明の実施例を図面に基づいて詳細に説明したが、これ等はあくまでも一実施形態であり、本発明は当業者の知識に基づいて種々の変更，改良を加えた態様で実施することができる。   As mentioned above, although the Example of this invention was described in detail based on drawing, these are one embodiment to the last, and this invention is implemented in the aspect which added the various change and improvement based on the knowledge of those skilled in the art. be able to.

本発明の一実施例であるめねじ手直し用工具を示す図で、(a) は正面図、(b) は(a) におけるＢ−Ｂ断面図、(c) はねじ部に設けられる修整用おねじの寸法を説明する図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the internal thread tool repair tool which is one Example of this invention, (a) is a front view, (b) is BB sectional drawing in (a), (c) is for the repair provided in a screw part. It is a figure explaining the dimension of a male screw. 図１のめねじ手直し用工具の使用方法を説明する図である。It is a figure explaining the usage method of the tool for female screw repair of FIG. 図１のめねじ手直し用工具において食付き部を省略した場合である。This is a case where the chamfered portion is omitted in the internal thread repair tool of FIG. 本発明の別の実施例を説明する図で、何れも図１の(b) に相当する断面図である。FIG. 5 is a diagram for explaining another embodiment of the present invention, and each is a cross-sectional view corresponding to FIG.

符号の説明Explanation of symbols

１０：めねじ手直し用工具 １８：めねじ ２２：修整用おねじ ２４：基準山形（組付おねじの基準山形） ２８、４４、５２、６４：ランド ２８ａ、４４ａ、５２ａ、６４ａ：リーディング側エッジ θ：すくい角 Ｅ２：組付おねじの公差域 Ｅ２max ：公差の上限値 Ｅ２min ：公差の下限値   10: Female screw retouching tool 18: Female screw 22: Modification male screw 24: Reference thread (reference thread for assembly male thread) 28, 44, 52, 64: Land 28a, 44a, 52a, 64a: Leading edge θ: Rake angle E2: Tolerance range of assembly male screw E2max: Upper limit of tolerance E2min: Lower limit of tolerance

Claims (5)

めねじに螺合されることにより該めねじのねじ山を修整するめねじ手直し用工具であって、
前記めねじと同じピッチの修整用おねじを有するとともに、
該修整用おねじの外径、有効径、および谷の径は、それぞれ前記めねじに螺合される組付おねじの外径、有効径、谷の径の各々の最小許容寸法より大きく、且つ、該組付おねじの外径、有効径、谷の径の各々の基準寸法より小さい
ことを特徴とするめねじ手直し用工具。 A female screw retouching tool that adjusts the thread of the female screw by being screwed to the female screw,
While having a male screw for modification of the same pitch as the female screw,
The external diameter, effective diameter, and trough diameter of the modification external thread are larger than the minimum allowable dimensions of the external diameter, effective diameter, and trough diameter of the assembled external thread that is screwed into the female thread , and a female screw rework tool, wherein the outer diameter of said set with the external thread, the effective diameter, that each of the reference dimension of the diameter of the recess is smaller than. 前記修整用おねじの外径、有効径、および谷の径は、それぞれ前記組付おねじの外径、有効径、谷の径の各々の最大許容寸法以下で、且つ、該外径および有効径は〔該最大許容寸法−６０μｍ〕以上である
ことを特徴とする請求項１に記載のめねじ手直し用工具。 The external diameter, effective diameter, and trough diameter of the modifying external thread are less than the maximum allowable dimensions of the external diameter, effective diameter, and trough diameter of the assembled male thread, respectively, and the external diameter and effective internal thread reworking tool according to claim 1 diameter, characterized in that it [the maximum allowable dimension -60μm] or more. 前記修整用おねじは周方向において分断されて複数のランドが形成されており、該ランドの前記めねじに螺入させられるリーディング側エッジのすくい角は負とされている
ことを特徴とする請求項１または２に記載のめねじ手直し用工具。 The rectifying male screw is divided in a circumferential direction to form a plurality of lands, and a rake angle of a leading edge to be screwed into the female screw of the land is negative. Item 3. The internal thread repair tool according to Item 1 or 2. 前記リーディング側エッジにおける山頂部分のすくい角は−２０°〜−６０°の範囲内で、該リーディング側エッジの逃げ角は０°で前記ランドの径寸法は一定である
ことを特徴とする請求項３に記載のめねじ手直し用工具。 The rake angle of the peak portion at the leading edge is within a range of -20 ° to -60 °, the clearance angle of the leading edge is 0 °, and the diameter of the land is constant. 3. The internal thread repair tool according to 3. 複数の角部が軸心を中心とする円弧形状とされた正多角柱形状を成しており、該円弧角部が前記ランドとして機能して前記修整用おねじが設けられている
ことを特徴とする請求項３または４に記載のめねじ手直し用工具。 A plurality of corners form a regular polygonal column shape having an arc shape centered on an axis, and the arcuate corners function as the lands and the repair male screw is provided. The female screw reworking tool according to claim 3 or 4.
JP2004308591A 2004-10-22 2004-10-22 Female thread repair tool Active JP4685988B2 (en)

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Publication number Priority date Publication date Assignee Title
US10183372B2 (en) * 2015-07-24 2019-01-22 Terry A. Lewis Thread repair tools and methods of making and using the same
CN115488081A (en) * 2022-09-13 2022-12-20 上海外高桥造船有限公司 Internal thread cleaning device and cleaning method

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JPS5445492U (en) * 1977-09-05 1979-03-29
JPS5723931U (en) * 1980-07-11 1982-02-06
JPH01125124U (en) * 1988-02-17 1989-08-25
JPH035741A (en) * 1989-06-02 1991-01-11 Canon Inc Display element illuminator for camera and accessory
JPH0310390A (en) * 1989-06-08 1991-01-17 Canon Inc Character recognizing device
JPH03117570A (en) * 1989-09-29 1991-05-20 Shigehiro Niwa Insertion of female screw correction ring
JPH04372311A (en) * 1991-06-14 1992-12-25 O S G Kk Manufacture of female screw and correction tool

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3010390U (en) * 1994-06-22 1995-05-02 孝夫 篠原 Thread modification bolt
JP3005741U (en) * 1994-06-28 1995-01-10 オーエスジー株式会社 Hand tap for high hardness materials

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Publication number Priority date Publication date Assignee Title
JPS5445492U (en) * 1977-09-05 1979-03-29
JPS5723931U (en) * 1980-07-11 1982-02-06
JPH01125124U (en) * 1988-02-17 1989-08-25
JPH035741A (en) * 1989-06-02 1991-01-11 Canon Inc Display element illuminator for camera and accessory
JPH0310390A (en) * 1989-06-08 1991-01-17 Canon Inc Character recognizing device
JPH03117570A (en) * 1989-09-29 1991-05-20 Shigehiro Niwa Insertion of female screw correction ring
JPH04372311A (en) * 1991-06-14 1992-12-25 O S G Kk Manufacture of female screw and correction tool

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