JP2008290165A - Forming method of female screw - Google Patents

Forming method of female screw Download PDF

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JP2008290165A
JP2008290165A JP2007136105A JP2007136105A JP2008290165A JP 2008290165 A JP2008290165 A JP 2008290165A JP 2007136105 A JP2007136105 A JP 2007136105A JP 2007136105 A JP2007136105 A JP 2007136105A JP 2008290165 A JP2008290165 A JP 2008290165A
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cylindrical member
hole
diameter
internal thread
circular
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JP4863391B2 (en
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Norio Matsubara
則夫 松原
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FUJI BOLT SEISAKUSHO KK
Fuji Bolt Manufacturing Co Ltd
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FUJI BOLT SEISAKUSHO KK
Fuji Bolt Manufacturing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To easily form a female screw in a cylindrical member and reduce a load of screw-thread cutting. <P>SOLUTION: When the hexagonal outer periphery 11 of the cylindrical member 1 having a circular hole 12 is pressed by an arc groove 21 of a die 2 to circularly reduce the diameter, the circular hole 12 is plastically deformed to a hexagonal hole 12a. Then, by using a tap having approximately the same bottom diameter as the diameter of a circle internally contacted with the hexagonal hole 12a, a female screw 13 is formed. Since the female screw 13 is formed only in the vicinity of the center of each edge of the hexagonal hole 12a, the screw-thread cutting load can be reduced. In the hexagonal hole 12a, work hardening is expected due to plastic deformation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、鉄筋連結用のスリーブ等の筒状部材の内周に、雌ねじを形成する方法であって、特に筒状部材の円形穴を多角形穴に塑性変形させて、この多角形穴にねじの下径が内接するように雌ねじを形成する方法に関する。   The present invention is a method of forming an internal thread on the inner periphery of a cylindrical member such as a sleeve for connecting reinforcing bars, in particular, by plastically deforming a circular hole of the cylindrical member into a polygonal hole, The present invention relates to a method of forming a female screw so that the lower diameter of the screw is inscribed.

従来から、鉄筋連結用のスリーブ等の筒状部材の内周に、雌ねじを切削する場合には、通常図１５に示すタップを使用している（例えば特許文献１参照。）。
特開平１０−１４６７２１号公報（１〜３頁、図４） Conventionally, when an internal thread is cut on the inner periphery of a tubular member such as a sleeve for connecting reinforcing bars, a tap shown in FIG.
JP 10-146721 A (pages 1 to 3, FIG. 4)

しかるにタップを使用して雌ネジを形成する場合には、まず雌ねじの下径（最小径）の穴をドリル等によって開け、この下穴にタップをねじ込みながら雌ねじを形成する。したがってタップによって、下穴の内壁を全周に渡って削り込むため、筒状部材が硬い材質の場合には、タップによるねじ切り作業の負荷が大きくなり、さらにはタップの損耗が早くなるという問題があった。   However, when forming a female thread using a tap, first, a hole having a lower diameter (minimum diameter) is formed by a drill or the like, and the female thread is formed while screwing the tap into the prepared hole. Therefore, since the inner wall of the pilot hole is cut by the tap over the entire circumference, when the cylindrical member is made of a hard material, the load of threading work by the tap increases, and further, the tap wears quickly. there were.

そこで本発明の目的は、ドリル等による下穴削り工程が不要であると共に、ねじ切り作業の負荷が少ない雌ねじの形成方法を提案することにある。   Accordingly, an object of the present invention is to propose a method for forming an internal thread that does not require a drilling process using a drill or the like and that has a low load of threading work.

上述した課題を解決すべく、本発明による雌ねじの形成方法の特徴は、多角形の筒状部材に設けた円形穴を、ダイス等を用いて多角形穴に塑性変形させ、次いでこの多角形穴の内壁の一部分にのみ雌ねじを形成することにある。すなわち、本発明による雌ねじの形成方法は、筒状部材の軸心に雌ねじを形成する方法であって、この筒状部材の外周は多角形であって内周は円形穴になっており、この筒状部材の外周を円弧溝を有する複数個のダイスで押圧して、またはこの筒状部材を円形の絞りに通すことによって、この筒状部材の円形穴を多角形穴に塑性変形させる第１の工程と、この多角形穴に雌ねじを形成する第２の工程を有している。そして上記雌ねじの下径は、上記多角形穴の内接円の径にほぼ等しくなっている。   In order to solve the above-mentioned problem, the feature of the method of forming the internal thread according to the present invention is that a circular hole provided in a polygonal cylindrical member is plastically deformed into a polygonal hole using a die or the like, and then this polygonal hole is formed. An internal thread is formed only in a part of the inner wall of the. That is, the internal thread forming method according to the present invention is a method of forming an internal thread in the axial center of the cylindrical member, and the outer periphery of the cylindrical member is a polygon and the inner periphery is a circular hole. First, the circular hole of the cylindrical member is plastically deformed into a polygonal hole by pressing the outer periphery of the cylindrical member with a plurality of dies having arc grooves or by passing the cylindrical member through a circular aperture. And a second step of forming a female screw in the polygonal hole. The lower diameter of the female screw is substantially equal to the diameter of the inscribed circle of the polygonal hole.

また本発明による雌ねじの形成方法の他の特徴は、筒状部材の外周が円形の場合である。すなわち、この雌ねじの形成方法は、筒状部材の軸心に雌ねじを形成する方法であって、この筒状部材の外周は円形であって内周は円形穴になっており、この筒状部材の外周を複数個のダイスで押圧して、またはこの筒状部材を多角形の絞りに通すことによって、この筒状部材の円形穴を多角形穴に塑性変形させる第１の工程と、この多角形穴に雌ねじを形成する第２の工程を有している。   Another feature of the method for forming an internal thread according to the present invention is that the outer periphery of the cylindrical member is circular. That is, this female thread forming method is a method of forming a female thread at the axial center of a cylindrical member, and the cylindrical member has a circular outer periphery and a circular hole on the inner periphery. A first step of plastically deforming the circular hole of the cylindrical member into a polygonal hole by pressing the outer periphery of the cylindrical member with a plurality of dies or passing the cylindrical member through a polygonal aperture; A second step of forming an internal thread in the square hole;

上記複数個のダイスのそれぞれの溝形状は、軸対称であって、この軸の周りにこの複数個のダイスを集合させると全体で多角形の開口孔を構成するように形成してあり、上記雌ねじの下径は、上記多角形穴の内接円の径にほぼ等しくしてある。   The groove shape of each of the plurality of dies is axially symmetric, and is formed so as to form a polygonal opening hole as a whole when the plurality of dies are assembled around the axis. The lower diameter of the female screw is substantially equal to the diameter of the inscribed circle of the polygonal hole.

上記筒状部材は、一端に雄ねじを有する鉄筋の連結用スリーブであることが好ましく、またこの筒状部材は、コンクリートに埋設されて、雄ねじ部材と連結されるインサートであることも好ましい。さらに上記ダイスの溝は、所定の軸方向間隔を隔てて複数列形成したものであってもよい。   The cylindrical member is preferably a reinforcing steel connecting sleeve having a male screw at one end, and the cylindrical member is preferably an insert embedded in concrete and connected to the male screw member. Further, the dice grooves may be formed in a plurality of rows at predetermined axial intervals.

ここで「筒状部材の外周は多角形」とは、筒状部材の断面形状が多角形であることを意味しており、三角形、四角形、五角形、及び六角形以上の多角形でもよいが、四角形、及び六角形が、より好ましい。また「筒状部材の内周は円形穴」
とは、筒状部材は、断面形状が円形の中空穴を有していることを意味している。また「円弧溝を有する複数個のダイス」とは、筒状部材の外周を、プレス等で押圧する溝形状が、円弧形状になっているダイスを意味し、円形を１８０度ずつ２分割したもの、１２０度ずつ３分割したもの、及び４個以上に分割したものが該当する。 Here, “the outer periphery of the cylindrical member is a polygon” means that the cross-sectional shape of the cylindrical member is a polygon, and it may be a triangle, a quadrangle, a pentagon, or a hexagon or more polygon, A quadrangle and a hexagon are more preferable. Also, "The inner circumference of the cylindrical member is a circular hole"
Means that the tubular member has a hollow hole with a circular cross-sectional shape. Also, “a plurality of dies having arc grooves” means dies in which the outer periphery of the cylindrical member has an arc shape in the groove shape that is pressed by a press or the like, and a circle is divided into two parts by 180 degrees. , 120 degrees divided into 3 parts and 4 or more parts.

上記「円形の絞りを通す」とは、筒状部材の外径より小さい円形の穴を有するダイスを用いて、押出し又は引抜き加工することを意味する。「筒状部材の円形穴を多角形穴に塑性変形させる」とは、本願発明の主要な特徴の１であって、筒状部材の多角形の外周を、円弧溝のダイスで押圧して縮径等すると、中空の円形穴が、この外周の多角形にほぼ相似する多角形の穴に塑性変形するという、経験的事実に基づくものである。すなわちこの方法によれば、円形穴を有する外周が多角形の筒状部材を準備すれば、この筒状部材に、容易かつ短時間に多角形の中空穴を形成することができる。なお円形穴に多角形の中子を挿入して、円形穴を多角形穴に塑性変形させてもよい。   The above-mentioned “passing through a circular drawing” means that extrusion or drawing is performed using a die having a circular hole smaller than the outer diameter of the cylindrical member. “Plastically deforming a circular hole of a cylindrical member into a polygonal hole” is one of the main features of the present invention, and the outer periphery of the polygonal shape of the cylindrical member is pressed and contracted by a circular groove die. In terms of diameter, etc., this is based on an empirical fact that a hollow circular hole is plastically deformed into a polygonal hole substantially similar to the outer polygon. That is, according to this method, if a cylindrical member having a circular hole and a polygonal outer periphery is prepared, a polygonal hollow hole can be easily formed in this cylindrical member in a short time. A circular core may be inserted into the circular hole, and the circular hole may be plastically deformed into a polygonal hole.

また上記「雌ねじの下径は、上記多角形穴の内接円の径にほぼ等しい」とは、本願発明の主要な特徴の１であって、雌ねじの下径、すなわち最小径が、多角形穴の内壁、すなわち多角形の各辺で構成される壁に接する円の直径に、略等しいことを意味する。この方法によれば、雌ねじは、多角形穴の内壁を構成する多角形の各辺の中央付近にのみ形成されることになり、タップ作業における負荷が、大幅に減少する。   The above-mentioned "the lower diameter of the female screw is substantially equal to the diameter of the inscribed circle of the polygonal hole" is one of the main features of the present invention, and the lower diameter of the female screw, that is, the minimum diameter is a polygon. It means that it is substantially equal to the diameter of a circle in contact with the inner wall of the hole, that is, the wall formed by each side of the polygon. According to this method, the female screw is formed only near the center of each side of the polygon that forms the inner wall of the polygonal hole, and the load in the tapping operation is greatly reduced.

上記「上記複数個のダイスのそれぞれの溝形状は軸対称であって、この軸の周りにこの複数個のダイスを集合させると全体で多角形の開口孔を構成する」とは、
例えば全体で三角形の開口孔を構成する場合には、この三角形の各辺の中央部分を三つに等分割した溝を有する３個のダイスを意味する。また例えば全体で四角形の開口孔を構成する場合には、この四角形を１８０度ずつ、上下対称形に二分割した溝を有する２個のダイス、または９０度ずつ、軸対称形に四分割した溝を有する４個のダイスを意味する。なお五角形以上の場合には、奇数の多角形につては、上述した三角形の場合と同様に分割し、偶数の多角形につては、上述した四角形の場合と同様に分割した溝を有するダイスを意味する。 "The groove shape of each of the plurality of dies is axisymmetric, and when the plurality of dies are assembled around this axis, a polygonal opening hole is formed as a whole."
For example, when a triangular opening hole is formed as a whole, it means three dies having grooves obtained by equally dividing the central portion of each side of the triangle into three. Also, for example, in the case of forming a square opening hole as a whole, two dies each having a groove that is divided into two vertically symmetric shapes by 180 degrees, or grooves that are divided into four axially symmetric grooves by 90 degrees. Means four dies with In the case of pentagons or more, odd-numbered polygons are divided in the same manner as in the above-mentioned triangle, and even-numbered polygons are divided into dice having grooves divided in the same manner as in the case of the above-mentioned quadrilateral. means.

なお「上記筒状部材の外周を複数個のダイスで押圧して、またはこの筒状部材を多角形の絞りに通すことによって、この筒状部材の円形穴を多角形穴に塑性変形させる」とは、本願発明の主要な特徴の１であって、筒状部材の円形の外周を、上述したように全体で多角形の開口孔を構成する複数個のダイスで押圧して縮径等すると、中空の円形穴が、この複数個のダイスで構成する多角形にほぼ相似する多角形の穴に塑性変形するという、経験的事実に基づくものである。すなわちこの方法によれば、円形穴を有する円筒状部材を準備すれば、この円筒状部材に、容易かつ短時間に多角形の中空穴を形成することができる。なお円形穴に多角形の中子を挿入して、円形穴を多角形穴に塑性変形させてもよい。   Note that "the cylindrical member is plastically deformed into a polygonal hole by pressing the outer periphery of the cylindrical member with a plurality of dies or by passing the cylindrical member through a polygonal aperture." Is one of the main features of the present invention, and when the circular outer periphery of the cylindrical member is pressed with a plurality of dies that form a polygonal opening as a whole, as described above, the diameter is reduced. This is based on an empirical fact that a hollow circular hole is plastically deformed into a polygonal hole substantially similar to the polygon formed by the plurality of dies. That is, according to this method, if a cylindrical member having a circular hole is prepared, a polygonal hollow hole can be formed in the cylindrical member easily and in a short time. A circular core may be inserted into the circular hole, and the circular hole may be plastically deformed into a polygonal hole.

雌ねじを、多角形穴の内壁を構成する各辺の中央部分にのみ形成するため、タップ作業における負荷が大幅に減少する。またタップに掛かる負荷が大幅に減少するため、タップ自体の損耗を減少させることができる。また多角形の中空穴は、ダイスを用いて、円形の中空穴を有する筒状部材の外周を縮径することによって、容易かつ短時間に形成することができる。またドリル等による下穴削り工程が不要になる。   Since the female screw is formed only at the central portion of each side constituting the inner wall of the polygonal hole, the load in the tapping operation is greatly reduced. Moreover, since the load applied to the tap is greatly reduced, the wear of the tap itself can be reduced. Polygonal hollow holes can be formed easily and in a short time by reducing the outer diameter of a cylindrical member having a circular hollow hole using a die. In addition, a pilot hole cutting process using a drill or the like is unnecessary.

なお本発明によって形成した雌ねじは、上述したように、多角形穴の内壁を構成する各辺の中央付近にのみ形成するものであって、円形の下穴の内壁全周に渡って形成した雌ねじに較べて、ねじに該当する部分の割合が少なくなり、ねじの強度がその分低下する。しかし、その強度が低下する分は、雌ねじの長さを増やせば、容易に補うことができるが、本発明の効果的な特徴は、雌ねじを螺刻する多角形穴は、塑性変形によって加工硬化するため、雌ねじ自体の強度を向上させることができるという点にある。したがって、ねじに該当する部分の割合が少なくなっても、ねじの強度の低下分を補うことが可能になる。   As described above, the female screw formed according to the present invention is formed only near the center of each side constituting the inner wall of the polygonal hole, and is formed over the entire inner wall of the circular pilot hole. Compared to the above, the ratio of the portion corresponding to the screw is reduced, and the strength of the screw is reduced accordingly. However, the decrease in strength can be easily compensated for by increasing the length of the internal thread. However, the effective feature of the present invention is that the polygonal hole for threading the internal thread is hardened by plastic deformation. Therefore, the strength of the female screw itself can be improved. Therefore, even if the ratio of the portion corresponding to the screw is reduced, it is possible to compensate for the decrease in the strength of the screw.

図１〜図１４を参照しつつ、本発明による雌ねじの形成方法について説明する。図１〜図３は、筒状部材１の円形穴１２を、ダイス２で押圧して多角形に塑性変形させる工程を示している。すなわち筒状部材１は、外周１１が６角形の鉄製であって、その軸心に円形穴１２が開口している。ダイス２は、相互に対向して開口する円弧形状の溝２１を有している。円弧形状の溝２１の間に、筒状部材１の外周１１を挟み込んで押圧すると、６角形の外周１１が、円形外周１１ａに縮径する。このとき６角形の頂角部分が、辺の部分より大きく縮径されるので、図２に示すように、この筒状部材の円形穴１２は、６角形穴１２ａに塑性変形する。   A method for forming an internal thread according to the present invention will be described with reference to FIGS. 1 to 3 show a process in which the circular hole 12 of the tubular member 1 is pressed with a die 2 to be plastically deformed into a polygon. That is, the cylindrical member 1 is made of iron having a hexagonal outer periphery 11, and a circular hole 12 is opened at the axial center thereof. The dice 2 has arc-shaped grooves 21 that open to face each other. When the outer periphery 11 of the tubular member 1 is sandwiched and pressed between the arc-shaped grooves 21, the hexagonal outer periphery 11 is reduced in diameter to the circular outer periphery 11a. At this time, since the apex portion of the hexagon is reduced in diameter more than the side portion, the circular hole 12 of this cylindrical member is plastically deformed into a hexagonal hole 12a as shown in FIG.

図３は、円形穴１２から塑性変形した６角形穴１２ａにタップをたてて、雌ねじ１３を螺刻した状態を示している。すなわちタップの谷径は、６角形穴の内接円１３ａの径と略同じになっているため、雌ねじ１３の下径は、この内接円の径と略同じに形成される。したがって雌ねじ１３は、６角形穴１２ａの各辺の中央近辺には形成されるが、各頂角の部分には削り代がないため、その部分には、ねじ部分がない空間１３ｂが残る。なお図３において、符号１３ｃは、雌ねじ１３の山径（最大径）を示している。   FIG. 3 shows a state in which a hexagonal hole 12a plastically deformed from the circular hole 12 is tapped and the female screw 13 is screwed. That is, since the valley diameter of the tap is substantially the same as the diameter of the inscribed circle 13a of the hexagonal hole, the lower diameter of the female screw 13 is formed to be substantially the same as the diameter of the inscribed circle. Accordingly, the female screw 13 is formed in the vicinity of the center of each side of the hexagonal hole 12a, but since there is no cutting allowance at each apex portion, a space 13b having no screw portion remains in that portion. In FIG. 3, reference numeral 13 c indicates the crest diameter (maximum diameter) of the female screw 13.

図４〜図６は、筒状部材１０１の外周１１１が３角形であって、その軸心に円形穴１１２が開口する場合を示している。ダイス１０２は、軸対称に１２０度ずつ３分割されており、それぞれ軸心に向って開口する円弧形状の溝１２１を有している。円弧形状の溝１２１の間に、筒状部材１０１の外周１１１を挟み込んで押圧すると、３角形の外周１１１が、円形外周１１１ａに縮径する。このとき３角形の頂角部分が、辺の部分より大きく縮径されるので、図５に示すように、この筒状部材の円形穴１１２は、３角形穴１１２ａに塑性変形する。   4 to 6 show a case where the outer periphery 111 of the cylindrical member 101 is triangular and a circular hole 112 is opened at the axial center thereof. The die 102 is divided into three 120 degrees each in axial symmetry, and has arc-shaped grooves 121 that open toward the axis. When the outer periphery 111 of the tubular member 101 is sandwiched and pressed between the arc-shaped grooves 121, the triangular outer periphery 111 is reduced in diameter to the circular outer periphery 111a. At this time, the diameter of the apex portion of the triangle is larger than that of the side portion. Therefore, as shown in FIG. 5, the circular hole 112 of this cylindrical member is plastically deformed into the triangular hole 112a.

図６は、円形穴１１２から塑性変形した３角形穴１１２ａにタップをたてて、雌ねじ１１３を螺刻した状態を示している。すなわちタップの谷径は、３角形穴の内接円１１３ａの径と略同じになっていため、雌ねじ１１３の下径は、この内接円の径と略同じに形成される。したがって雌ねじ１１３は、３角形穴１１２ａの各辺の中央近辺には形成されるが、各頂角の部分には削り代がないため、その部分には、ねじ部分がない空間１１３ｂが残る。なお図６において、符号１１３ｃは、雌ねじ１１３の山径（最大径）を示している。   FIG. 6 shows a state in which a tapped hole is formed in the triangular hole 112a plastically deformed from the circular hole 112 and the female screw 113 is screwed. That is, since the valley diameter of the tap is substantially the same as the diameter of the inscribed circle 113a of the triangular hole, the lower diameter of the female screw 113 is formed to be substantially the same as the diameter of the inscribed circle. Accordingly, the female screw 113 is formed in the vicinity of the center of each side of the triangular hole 112a, but since there is no cutting allowance at each apex portion, a space 113b having no screw portion remains in that portion. In FIG. 6, reference numeral 113 c indicates the mountain diameter (maximum diameter) of the female screw 113.

図７〜図９は、円形の筒状部材２０１の円形穴２１２を、６角形のダイス２０２で押圧して６角形に塑性変形させる工程を示している。すなわち筒状部材２０１は、外周２１１が円形の鉄製であって、その軸心に円形穴２１２が開口している。ダイス２０２は、１８０度ずつ上下対称に２分割されており、相互に対向して開口する溝２２１を有している。溝２２１は、軸心周りに集合させると、６角形の開口孔を構成する形状になっている。   7 to 9 show a process in which the circular hole 212 of the circular cylindrical member 201 is pressed by a hexagonal die 202 to be plastically deformed into a hexagon. That is, the cylindrical member 201 is made of iron having a circular outer periphery 211, and a circular hole 212 is opened at the axial center thereof. The die 202 is divided into two vertically symmetrical portions by 180 degrees, and has a groove 221 that opens opposite to each other. The grooves 221 have a shape that forms a hexagonal opening when gathered around the axis.

ダイス２０２の相互に対向して開口する溝２２１の間に、筒状部材２０１の円形の外周２１１を挟み込んで押圧すると、この円形の外周が、６角形外周２１１ａに縮径する。このときダイス２０２の６角形の溝２２１の各辺部分が、頂角の部分より大きく縮径するので、図８に示すように、筒状部材２０１の円形穴２１２は、６角形穴２１２ａに塑性変形する。   When the circular outer periphery 211 of the cylindrical member 201 is sandwiched and pressed between the grooves 221 opening facing each other of the dies 202, the circular outer periphery is reduced in diameter to a hexagonal outer periphery 211a. At this time, each side portion of the hexagonal groove 221 of the die 202 is contracted to a larger diameter than the apex angle portion, so that the circular hole 212 of the cylindrical member 201 is plastic to the hexagonal hole 212a as shown in FIG. Deform.

図９は、円形穴２１２から塑性変形した６角形穴２１２ａにタップをたてて、雌ねじ２１３を螺刻した状態を示している。すなわちタップの谷径は、６角形穴の内接円２１３ａの径と略同じになっているため、雌ねじ２１３の下径は、この内接円の径と略同じに形成される。したがって雌ねじ２１３は、６角形穴２１２ａの各辺の中央近辺には形成されるが、各頂角の部分には削り代がないため、その部分には、ねじ部分がない空間２１３ｂが残る。なお図９において、符号２１３ｃは、雌ねじ２１３の山径（最大径）を示している。   FIG. 9 shows a state in which the hexagonal hole 212a plastically deformed from the circular hole 212 is tapped and the female screw 213 is screwed. That is, since the valley diameter of the tap is substantially the same as the diameter of the inscribed circle 213a of the hexagonal hole, the lower diameter of the female screw 213 is formed to be substantially the same as the diameter of the inscribed circle. Accordingly, the female screw 213 is formed in the vicinity of the center of each side of the hexagonal hole 212a, but since there is no cutting allowance at each apex angle portion, a space 213b having no screw portion remains in that portion. In FIG. 9, reference numeral 213 c indicates the mountain diameter (maximum diameter) of the female screw 213.

図１０〜図１１は、円形の筒状部材３０１の円形穴３１２を、６角形の絞り３０２を通すことによって６角形に塑性変形させる工程を示している。すなわち図１０に示すように、絞り３０２は、テーパー状の開口孔３２１を有しており、この開口孔は、入口部分が円形で、出口に向って６角形となる先細形状に形成してある。
一方筒状部材３０１は、外周３１１が円形の鉄製であって、その軸心に円形穴３１２が開口している。 10 to 11 show a step of plastically deforming the circular hole 312 of the circular cylindrical member 301 into a hexagon by passing it through the hexagonal diaphragm 302. That is, as shown in FIG. 10, the diaphragm 302 has a tapered opening hole 321, and this opening hole is formed in a tapered shape having a circular entrance portion and a hexagon toward the exit. .
On the other hand, the cylindrical member 301 is made of iron having a circular outer periphery 311, and a circular hole 312 is opened at the axial center thereof.

そこで図１１に示すように、筒状部材３０１を、絞り３０２のテーパー状の開口孔３２１を通して引き抜くと、円形の外周３１１が、６角形外周３１１ａに縮径する。このとき絞り３０２の６角形の開口孔３２１の各辺部分が、頂角の部分より大きく縮径するので、筒状部材３０１の円形穴３１２は、６角形穴３１２ａに塑性変形する。なお図１や図４に示すような外周が多角形の円筒部材を、円形の絞りを通すことによっても、この円筒部材の軸心に設けた円形穴を多角形に塑性変形させることができる。   Therefore, as shown in FIG. 11, when the cylindrical member 301 is pulled out through the tapered opening hole 321 of the diaphragm 302, the circular outer periphery 311 is reduced in diameter to a hexagonal outer periphery 311a. At this time, each side portion of the hexagonal opening hole 321 of the diaphragm 302 is contracted to a larger diameter than the apex angle portion, so that the circular hole 312 of the cylindrical member 301 is plastically deformed into a hexagonal hole 312a. The circular hole provided in the axial center of this cylindrical member can also be plastically deformed into a polygon by passing a cylindrical member having a polygonal outer periphery as shown in FIGS.

なお上述した雌ねじを形成した筒状部材は、その両端部の、一端に雄ねじを形成した鉄筋をねじ込むことによって、鉄筋の連結用スリーブとして使用できる。   In addition, the cylindrical member which formed the internal thread mentioned above can be used as a connection sleeve of a reinforcing bar by screwing the reinforcing bar which formed the external thread at one end of the both ends.

図１２〜図１４は、筒状部材４０１の円形穴４１２を、所定の軸方向間隔を隔てた３列の溝を有するダイス４０２で押圧して、軸方向の３箇所において多角形に塑性変形させる工程を示している。すなわち筒状部材４０１は、外周４１１が６角形の鉄製であって、その軸心に円形穴４１２が開口している。ダイス４０２は、１８０度ずつ上下対称に２分割したものであって、相互に対向して開口する円弧形状の溝４２１ａを３列有している。なお３列の円弧形状の溝４２１ａは、所定の長さで隔ててあり、その間の溝形状４２１ｂは、筒状部材４０１の外周４１１と略同じ６角形になっている。   12-14, the circular hole 412 of the cylindrical member 401 is pressed with a die 402 having three rows of grooves spaced apart by a predetermined axial distance, and is plastically deformed into a polygon at three axial positions. The process is shown. That is, the cylindrical member 401 is made of iron having an outer periphery 411 having a hexagonal shape, and a circular hole 412 is opened at the axial center thereof. The dies 402 are divided into two vertically symmetrical portions by 180 degrees, and have three rows of arc-shaped grooves 421a that open to face each other. Note that the three rows of arc-shaped grooves 421 a are separated by a predetermined length, and the groove shape 421 b therebetween is a hexagon that is substantially the same as the outer periphery 411 of the tubular member 401.

ダイス４０２の間に、筒状部材４０１の外周４１１を挟み込んで押圧すると、３列の円弧形状の溝４２１ａの部分において、６角形のこの外周が、円形外周４１１ａに縮径する。一方３列の円弧形状の溝４２１ａの間の溝形状４２１ｂは、上述したように筒状部材４０１の外周４１１と略同じ６角形になっているため、この部分は縮径されずに６角形のままで残っている。したがって縮径後の筒状部材４０１の外周は、図１３に示すように、縮径された円形の外周に間に、縮径されないままの６角形の外周４１１ｂが、所定の軸方向間隔を隔てて３列並んだ状態になる。   When the outer periphery 411 of the cylindrical member 401 is sandwiched and pressed between the dies 402, the hexagonal outer periphery is reduced in diameter to the circular outer periphery 411a in the three rows of arc-shaped grooves 421a. On the other hand, the groove shape 421b between the three rows of arc-shaped grooves 421a is substantially the same hexagon as the outer periphery 411 of the tubular member 401 as described above. Remains. Therefore, as shown in FIG. 13, the outer periphery of the cylindrical member 401 after the diameter reduction is between a circular outer periphery that is reduced in diameter, and a hexagonal outer periphery 411b that is not reduced in diameter is spaced by a predetermined axial interval. Will be in a state of three rows.

さてダイス４０２の３列の円弧形状の溝４２１ａによって、筒状部材４０１の６角形の外周４１１が、円形の外周４１１ａに縮径される部分においては、この外周の６角形の頂角部分が、辺の部分より大きく縮径されるので、図１４に示すように、この部分に位置する筒状部材の円形穴４１２は、６角形穴４１２ａに塑性変形する。しかるに縮径されないままの６角形の外周４１１ｂ部分は、円形穴４１２も殆んど縮径されない部分４１２ｂが残る。したがって筒状部材４０１の円形穴４１２は、塑性変形を受けた後は、軸方向に６角形穴４１２ａに塑性変形された部分４１１ａと、あまり塑性変形されずに円形穴のままに残っている部分４１１ｂとが、軸方向に交互に並ぶ状態になる。   Now, in the portion where the hexagonal outer periphery 411 of the tubular member 401 is reduced in diameter to the circular outer periphery 411a by the three rows of arc-shaped grooves 421a of the die 402, the hexagonal apex portion of this outer periphery is Since the diameter is reduced larger than the side portion, as shown in FIG. 14, the circular hole 412 of the cylindrical member located in this portion is plastically deformed into a hexagonal hole 412a. However, in the hexagonal outer periphery 411b portion that is not reduced in diameter, a portion 412b in which the circular hole 412 is hardly reduced in diameter remains. Therefore, the circular hole 412 of the cylindrical member 401 has a portion 411a plastically deformed into a hexagonal hole 412a in the axial direction after being subjected to plastic deformation, and a portion remaining as a circular hole without being plastically deformed so much. 411b are alternately arranged in the axial direction.

したがって塑性変形後の筒状部材４０１に、タップをたてる等によって雌ねじを螺刻すると、６角形穴４１２ａに塑性変形された部分４１１ａにのみ、雌ネジが形成される。なお筒状部材４０１には、縮径されないままの６角形の外周４１１ｂが３列形成されるので、この筒状部材一端部に、雄ねじを形成した鉄筋等を連結してコンクリートに埋設すれば、インサートとして使用できる。   Therefore, when a female screw is screwed into the tubular member 401 after plastic deformation by tapping or the like, the female screw is formed only in the portion 411a plastically deformed into the hexagonal hole 412a. Since the cylindrical member 401 has three rows of hexagonal outer circumferences 411b that are not reduced in diameter, one end of this cylindrical member is connected to a reinforcing bar or the like that has a male screw, and embedded in concrete. Can be used as an insert.

筒状部材への下穴加工が不要であると共に、少ない負荷で雌ねじを形成することができるため、建築部品等に関する産業に広く利用可能である。   Since it is not necessary to prepare a pilot hole in a cylindrical member and a female screw can be formed with a small load, it can be widely used in industries related to building parts and the like.

６角形の筒状部材をダイスで縮径する工程を示す概略断面図である。It is a schematic sectional drawing which shows the process of diameter-reducing a hexagonal cylindrical member with a die | dye. ６角形の筒状部材をダイスで縮径した後の断面図である。It is sectional drawing after reducing the diameter of a hexagonal cylindrical member with a die. ６角形穴に形成した雌ねじの説明図である。It is explanatory drawing of the internal thread formed in the hexagonal hole. ３角形の筒状部材をダイスで縮径する工程を示す概略断面図である。It is a schematic sectional drawing which shows the process of diameter-reducing a triangular cylindrical member with a die | dye. ３角形の筒状部材をダイスで縮径した後の断面図である。It is sectional drawing after diameter-reducing a triangular cylindrical member with a die | dye. ３角形穴に形成した雌ねじの説明図である。It is explanatory drawing of the internal thread formed in the triangular hole. 円形の筒状部材をダイスで縮径する工程を示す概略断面図である。It is a schematic sectional drawing which shows the process of diameter-reducing a circular cylindrical member with a die | dye. 円形の筒状部材をダイスで縮径した後の断面図である。It is sectional drawing after reducing a diameter of a circular cylindrical member with a die. ６角形穴に形成した雌ねじの説明図である。It is explanatory drawing of the internal thread formed in the hexagonal hole. ６角形の絞りの左右左側面図及び断面図である。It is the left-right side view and sectional drawing of a hexagonal aperture_diaphragm | restriction. 円形の筒状部材を６角形の絞りを通して縮径する工程を示す概略断面図である。It is a schematic sectional drawing which shows the process of diameter-reducing a circular cylindrical member through a hexagonal aperture_diaphragm | restriction. ３列の溝を有するダイスで縮径する工程を示す概略断面図である。It is a schematic sectional drawing which shows the process of diameter-reducing with the dice | dies which have a groove | channel of 3 rows. ３列の溝を有するダイスで縮径した後の外観を示す斜視図である。It is a perspective view which shows the external appearance after diameter-reducing with the dice | dies which have a groove | channel of 3 rows. ３列の溝を有するダイスで縮径した後の概略断面図である。It is a schematic sectional drawing after diameter-reducing with the dice | dies which have a groove | channel of 3 rows. タップの概略外形図である。It is a schematic external view of a tap.

符号の説明Explanation of symbols

１、１０１、２０１、３０１ 筒状部材
１１、１１１、２１１、３１１、４１１ 外周
１２、１１２、２１２、３１２、４１２ 円形穴
１２ａ、１１２ａ、２１２ａ、３１２ａ、４１２ａ 多角形穴
１３、１１３、２１３ 雌ねじ
１３ａ、１１３ａ、２１３ａ 内接円
２、１０２、２０２、４０２ ダイス
３０２ 絞り
２１、１２１、２２１ 円弧溝 1, 101, 201, 301 Cylindrical member 11, 111, 211, 311, 411 Outer periphery 12, 112, 212, 312, 412 Circular hole 12a, 112a, 212a, 312a, 412a Polygonal hole 13, 113, 213 Female thread 13a , 113a, 213a Inscribed circle 2, 102, 202, 402 Die 302 Aperture 21, 121, 221 Arc groove

Claims (5)

筒状部材の軸心に雌ねじを形成する方法であって、
上記筒状部材の外周は多角形であって内周は円形穴になっており、
上記筒状部材の外周を円弧溝を有する複数個のダイスで押圧して、またはこの筒状部材を円形の絞りに通すことによって、この筒状部材の円形穴を多角形穴に塑性変形させる第１の工程と、
上記多角形穴に雌ねじを形成する第２の工程を有し、
上記雌ねじの下径は、上記多角形穴の内接円の径にほぼ等しい
ことを特徴とする雌ねじの形成方法。 A method of forming an internal thread in the axial center of a tubular member,
The outer periphery of the cylindrical member is a polygon and the inner periphery is a circular hole,
The cylindrical member is plastically deformed into a polygonal hole by pressing the outer periphery of the cylindrical member with a plurality of dies having arc grooves or by passing the cylindrical member through a circular aperture. 1 process,
A second step of forming an internal thread in the polygonal hole;
The method for forming an internal thread, wherein the internal diameter of the internal thread is substantially equal to the diameter of the inscribed circle of the polygonal hole. 筒状部材の軸心に雌ねじを形成する方法であって、
上記筒状部材の外周は円形であって内周は円形穴になっており、
上記筒状部材の外周を複数個のダイスで押圧して、またはこの筒状部材を多角形の絞りに通すことによって、この筒状部材の円形穴を多角形穴に塑性変形させる第１の工程と、
上記多角形穴に雌ねじを形成する第２の工程を有し、
上記複数個のダイスのそれぞれの溝形状は軸対称であって、この軸の周りにこの複数個のダイスを集合させると全体で多角形の開口孔を構成するように形成してあり、
上記雌ねじの下径は、上記多角形穴の内接円の径にほぼ等しい
ことを特徴とする雌ねじの形成方法。 A method of forming an internal thread in the axial center of a tubular member,
The outer periphery of the cylindrical member is circular and the inner periphery is a circular hole,
A first step of plastically deforming a circular hole of the cylindrical member into a polygonal hole by pressing the outer periphery of the cylindrical member with a plurality of dies or by passing the cylindrical member through a polygonal aperture. When,
A second step of forming an internal thread in the polygonal hole;
The groove shape of each of the plurality of dies is axially symmetric, and when the plurality of dies are assembled around the axis, a polygonal opening hole is formed as a whole.
The method for forming an internal thread, wherein the internal diameter of the internal thread is substantially equal to the diameter of the inscribed circle of the polygonal hole. 請求項１または２のいずれかにおいて、上記筒状部材は、一端に雄ねじを有する鉄筋の連結用スリーブであることを特徴とする雌ねじの形成方法。       3. The method for forming an internal thread according to claim 1, wherein the cylindrical member is a connecting rod connecting rod having an external thread at one end. 請求項１または２のいずれかにおいて、上記筒状部材は、コンクリートに埋設されて、雄ねじ部材と連結されるインサートであることを特徴とする雌ねじの形成方法。       3. The method for forming a female screw according to claim 1, wherein the cylindrical member is an insert embedded in concrete and connected to a male screw member. 請求項１〜４のいずれかの１において、上記ダイスの溝は、所定の軸方向間隔を隔てて複数列形成してあることを特徴とする雌ねじの形成方法。       5. The method for forming an internal thread according to claim 1, wherein the dice grooves are formed in a plurality of rows at predetermined axial intervals.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58168455A (en) * 1982-03-31 1983-10-04 Nippon Kokan Kk <Nkk> Manufacture of square steel pipe
JPH0251622A (en) * 1988-08-10 1990-02-21 Yanmar Diesel Engine Co Ltd Cone clutch
JPH05337591A (en) * 1992-06-08 1993-12-21 Tokyo Tekko Co Ltd Manufacture of female member
JP2002361319A (en) * 2001-06-05 2002-12-17 Sumitomo Metal Ind Ltd Method for manufacturing seamless steel tube excellent in internal smoothness and seamless steel tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58168455A (en) * 1982-03-31 1983-10-04 Nippon Kokan Kk <Nkk> Manufacture of square steel pipe
JPH0251622A (en) * 1988-08-10 1990-02-21 Yanmar Diesel Engine Co Ltd Cone clutch
JPH05337591A (en) * 1992-06-08 1993-12-21 Tokyo Tekko Co Ltd Manufacture of female member
JP2002361319A (en) * 2001-06-05 2002-12-17 Sumitomo Metal Ind Ltd Method for manufacturing seamless steel tube excellent in internal smoothness and seamless steel tube

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