JPH0691326A - Production of hexagonal steel tube - Google Patents

Production of hexagonal steel tube

Info

Publication number
JPH0691326A
JPH0691326A JP26920492A JP26920492A JPH0691326A JP H0691326 A JPH0691326 A JP H0691326A JP 26920492 A JP26920492 A JP 26920492A JP 26920492 A JP26920492 A JP 26920492A JP H0691326 A JPH0691326 A JP H0691326A
Authority
JP
Japan
Prior art keywords
hexagonal
steel pipe
die
hexagonal steel
steel tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP26920492A
Other languages
Japanese (ja)
Other versions
JP2527671B2 (en
Inventor
Etsuji Kajiki
悦治 梶木
Hiroshi Nakayama
弘士 中山
Shigenobu Tsutsumi
重信 堤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP4269204A priority Critical patent/JP2527671B2/en
Publication of JPH0691326A publication Critical patent/JPH0691326A/en
Application granted granted Critical
Publication of JP2527671B2 publication Critical patent/JP2527671B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To obtain such manufacture that a small hexagonal steel tube having a hexagonal corner R is manufactured by cold drawing and the hexagonal steel tube can be used for a nut etc., as it is. CONSTITUTION:In a method to manufacture the hexagonal steel tube by cold drawing from a round steel tube stock having a wall thickness T and an outer diameter D ratio <=0.10, a die 1 having a worked surface obtained by intersecting and connecting a hexagonal pyramid surface 2 positioned on the inlet side and a hexagonal pillar surface 3 positioned on the outlet side along the central axis of the die 1 is used.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、六角鋼管の製造方法、
詳しくは肉厚T/外径D≧0.10の丸鋼管を素材と
し、冷間引抜きにより六角形のコーナーRの小さい六角
鋼管を製造する方法に関する。
BACKGROUND OF THE INVENTION The present invention relates to a method for manufacturing a hexagonal steel pipe,
More specifically, the present invention relates to a method for producing a hexagonal steel pipe having a small hexagonal corner R by cold drawing using a round steel pipe having a wall thickness T / outer diameter D ≧ 0.10.

【0002】[0002]

【従来の技術】丸鋼管を素材とし、冷間引抜きにより六
角鋼管を製造するに当たっては、六角鋼管がナット等の
用途に供されることを考慮して、六角形のコーナーRを
極力小さくし、六角辺の角をシャープに成形する必要が
ある。
2. Description of the Related Art In manufacturing a hexagonal steel pipe by cold drawing using a round steel pipe as a material, the hexagonal corner R is made as small as possible in consideration of the fact that the hexagonal steel pipe is used for nuts and the like. It is necessary to sharpen the corners of the hexagon.

【0003】発明者は、六角辺の角がシャープである六
角鋼管を製造するため、当初図5に示すように、ダイス
1の中心軸に沿って、入口側に配置した六角錐体面2
と、出口側に配置した六角柱体面3とを、大きいR(4
0〜60mm)による曲面7を介設して連結したダイス
1を用いて行った。六角鋼管の製造において、Rの曲面
7のある上記のダイス1を用いたのは、丸鋼管から丸鋼
管を冷間引抜きする場合に使用されるダイスが、かかる
曲面を有するダイスを使用しており、同じく丸鋼管を素
材とし、冷間引抜きを行うという点での両者の共通性か
ら、その場合のダイスの形状に倣ったものである。因
に、丸鋼管から丸鋼管を冷間引抜きする場合に、かかる
形状のダイスが使用されているのは、引抜き方向での急
激なメタルフローを避け、成るべく円滑な冷間引抜きを
施すことにある考えられる。
The inventor initially manufactures a hexagonal steel pipe having sharp hexagonal sides. Therefore, as shown in FIG. 5, the hexagonal pyramid surface 2 arranged on the inlet side along the central axis of the die 1 is initially shown.
And the hexagonal prism surface 3 arranged on the exit side with a large R (4
(0 to 60 mm) and the die 1 connected through the curved surface 7 was used. In the production of hexagonal steel pipe, the above-mentioned die 1 having a curved surface 7 of R is used because the die used when cold-drawing a round steel pipe from a round steel pipe uses a die having such a curved surface. Similarly, the shape of the die is modeled from the commonality of the two in that cold drawing is performed using a round steel pipe as a material. By the way, when cold-drawing a round steel pipe from a round steel pipe, the die with such a shape is used to avoid a sudden metal flow in the drawing direction and perform a smooth cold drawing as much as possible. There is possible.

【0004】[0004]

【発明が解決しようとする課題】ところが、図5に示す
ダイスにより、例えば肉厚T16.4mm、外径D8
2.6mm(肉厚T/D=0.198)の丸鋼管を素材
として、対辺長さB64mm、内径d40.5mmの六
角鋼管を製造したところ、六角鋼管のコーナーRが4.
2〜4.7mmとなるというよに、コーナー部に不具合
のものが発生し易いということが判った。コーナーRが
このように大きい値となると、外見上の商品価値を低下
させるだけではなく、ナット締めをする時空回りすると
いうことで問題点となる。もつとも、冷間引抜きした製
品に更に切削等を施して六角辺のコーナーをシャープに
することもできるが、それでは折角丸鋼管から冷間引抜
きにより、一挙に六角鋼管を製造し、そのままナット等
の材料に供しようとする冷間引抜きによる方法のもつ優
位性は発揮できないことになる。
However, when the die shown in FIG. 5 is used, for example, the wall thickness is T16.4 mm and the outer diameter is D8.
When a hexagonal steel pipe having an opposite side length B of 64 mm and an inner diameter of d40.5 mm was manufactured using a round steel pipe of 2.6 mm (wall thickness T / D = 0.198) as a material, the corner R of the hexagonal steel pipe was 4.
It has been found that a defect is likely to occur at the corner portion, such as 2 to 4.7 mm. When the corner R has such a large value, not only the apparent commercial value is lowered but also a problem arises in that the nut is idled when tightening the nut. It is also possible to further cut the cold drawn product to sharpen the corners of the hexagonal side, but with that, a hexagonal steel pipe is manufactured at once by cold drawing from a rounded round steel pipe and the nuts and other materials are used as is. Therefore, the advantage of the cold drawing method, which is to be used, cannot be exhibited.

【0005】本発明は、従来の技術の有するこのような
問題点に鑑みてなされたものであり、その目的とすると
ころは、六角形のコーナーRを極力小さくし、六角辺の
角をシャープに成形し、そのままナット等の用途にも供
することができる六角鋼管の製造方法を提供しようとす
るものである。
The present invention has been made in view of the above problems of the prior art. The object of the present invention is to make the hexagonal corner R as small as possible and sharpen the hexagonal corners. An object of the present invention is to provide a method for producing a hexagonal steel pipe that can be molded and used as it is for applications such as nuts.

【0006】[0006]

【課題を解決するための手段】上記の目的を達成するた
めに、本発明は、肉厚T/外径D≧0.10の丸鋼管を
素材とし、冷間引抜きにより六角鋼管を製造する方法に
おいて、ダイスの中心軸に沿って、入口側に位置する六
角錐体面と、出口側に位置する六角柱体面とを交差して
連結した加工面を有するダイスを用いることを特徴とす
る六角鋼管の製造方法により構成される。本発明者は、
ダイスの引抜き加工面の形状が、六角鋼管の六角辺の角
の充満度に関係のあることに着目し、種々検討を重ねた
結果、ダイスの加工面を入口側に位置する六角錐体面
と、出口側に位置する六角柱体面とを交差して連結して
形成することが、六角形のコーナーRを小さくし、六角
辺の角をシャープに成形することに大きく寄与すること
を見出した。入口側に位置する六角錐体面と、出口側に
位置する六角柱体面とは、上述したRの曲面を介設する
ことなく、直接交差して連結するものである。もっと
も、六角辺の角の充満度に殆ど影響を与えない範囲で交
差部に数mm程度(例えば2〜3mm)のr、面取りを
することは、本発明において、六角錐体面と、六角柱体
面とを、交差して連結する意味に含まれるものとする。
本発明により製造する六角鋼管の内周は円形であるの
で、ポンチの加工面は円形のものを使用する。ここで、
ダイスの形状を図1により示す。図1において、ダイス
1は、入口側に位置する六角錐体面2と、出口側に位置
する六角柱体面3とを交差して連結した加工面を有す
る。ここで、六角錐体面2は、ダイス1の入口側から出
口側の方向に先細りの向きとなるよう位置する。六角錐
体面2と、六角柱体面3との両方の面が交差する部分
は、この例では僅かに3mmのrにより、角取りをす
る。角が尖っていることから、ダイス内表面でのその部
分が不測の原因により局部的に損傷すると、製品に疵を
刻印することになるので、それを防止するという配慮に
よる。また、素材である丸鋼管は、肉厚T/外径D≧
0.10のものを使用する。従って、薄肉の電縫鋼管を
素材として、内面、外面ともに、六角である鋼管を製造
する従来の技術は全く別の技術であるといえる。なお、
肉厚T/外径Dの上限は実際には0.30程度である。
また、本発明により製造する外周六角、内周円形の六角
鋼管は、厚肉のものを対象とし、対辺長さB/内径d
は、1.1〜3.5である。
In order to achieve the above object, the present invention uses a round steel pipe having a wall thickness T / outer diameter D ≧ 0.10 as a raw material and a method for producing a hexagonal steel pipe by cold drawing. In, along the central axis of the die, the hexagonal pyramid surface located on the inlet side, and the hexagonal columnar surface located on the outlet side, using a die having a processing surface that is crossed and connected It is configured by the manufacturing method. The inventor
Focusing on that the shape of the drawing surface of the die is related to the filling degree of the hexagonal side of the hexagonal steel pipe, as a result of various studies, the processed surface of the die is a hexagonal pyramid surface located on the inlet side, and It has been found that forming a structure by intersecting and connecting the hexagonal columnar surface located on the outlet side greatly reduces the corner R of the hexagon and sharpens the corner of the hexagonal side. The hexagonal pyramid surface located on the inlet side and the hexagonal prism surface located on the outlet side are directly connected to each other without interposing the curved surface of R described above. However, in the present invention, the chamfering of r of about several mm (for example, 2 to 3 mm) is performed in the present invention in the range that hardly affects the filling degree of the corners of the hexagonal side in the present invention. And shall be included in the meaning of crossing and connecting.
Since the inner circumference of the hexagonal steel pipe manufactured according to the present invention is circular, the punched surface is circular. here,
The shape of the die is shown in FIG. In FIG. 1, the die 1 has a processing surface formed by intersecting and connecting a hexagonal pyramid surface 2 located on the inlet side and a hexagonal prism surface 3 located on the outlet side. Here, the hexagonal pyramid surface 2 is positioned so as to taper in the direction from the inlet side to the outlet side of the die 1. The portion where both surfaces of the hexagonal pyramid surface 2 and the hexagonal prism surface 3 intersect is chamfered by r of only 3 mm in this example. Since the corners are sharp, if the part on the inner surface of the die is locally damaged due to an unexpected cause, a flaw will be imprinted on the product, which is to prevent it. In addition, the round steel pipe that is the material has a wall thickness T / outer diameter D ≧
Use the one of 0.10. Therefore, it can be said that the conventional technique for manufacturing a steel pipe having a hexagonal inner surface and an outer surface from a thin electric resistance welded steel pipe is a completely different technique. In addition,
The upper limit of the wall thickness T / outer diameter D is actually about 0.30.
The hexagonal outer peripheral and inner circular hexagonal steel pipes manufactured according to the present invention are intended to be thick-walled, and the opposite side length B / inner diameter d
Is 1.1 to 3.5.

【0007】また、本発明は、肉厚T/外径D≧0.1
0の丸鋼管を素材とし、冷間引抜きにより六角鋼管を製
造する方法において、ダイスの中心軸に沿って、入口側
に位置する、六角錐体の稜線間に外方への湾曲部を付与
した面と、出口側に位置する六角柱体面とを交差して連
結した加工面を有するダイスを用いることを特徴とする
六角鋼管の製造方法により構成される。かかるダイスを
使用してもコーナーRの小さい六角鋼管を得ることがで
きる。六角錐体の稜線間に外方へ付与する湾曲部は、六
角柱体面と交差する部分近傍に設けるが、加工面の全部
に設けてもよい。また、湾曲部は、図2に示すごとく、
ダイスの入口側から出口側に向かって漸減するように
し、六角錐体と六角柱体との交差部において0とするこ
とができる。六角錐体の隣接する稜線が構成する面に対
して、湾曲部の中央高さは最大3mm程度である。本ダ
イスの場合も、交差部に上述した面取り、角取りを設け
てもよい。ここで、ダイスの形状を図2において示す。
図2において、ダイス1は、入口側に位置する六角錐体
4の稜線5間に外方へ湾曲部6を付与した面と、出口側
に位置する六角柱体面3とを交差して連結した加工面を
有する。湾曲部6を有する六角錐体面2aと、六角柱体
面3との交差する部分は、この例では2mmのrによ
り、角取りをする。
In the present invention, the wall thickness T / outer diameter D ≧ 0.1
In a method for producing a hexagonal steel pipe by cold drawing using a round steel pipe of 0 as a material, an outward curved portion is provided along the central axis of the die between the ridgelines of the hexagonal pyramid located on the inlet side. A hexagonal steel pipe manufacturing method is characterized by using a die having a machined surface in which a surface and a hexagonal prism surface located on the outlet side are crossed and connected. Even if such a die is used, a hexagonal steel pipe having a small corner R can be obtained. The curved portion provided outwardly between the ridge lines of the hexagonal pyramid is provided in the vicinity of the portion intersecting the hexagonal prism surface, but may be provided on the entire processed surface. In addition, the curved portion, as shown in FIG.
It can be gradually reduced from the entrance side to the exit side of the die, and can be set to 0 at the intersection of the hexagonal pyramid and the hexagonal prism. The center height of the curved portion is about 3 mm at the maximum with respect to the surface formed by the adjacent ridgelines of the hexagonal pyramid. Also in the case of this die, the above-described chamfer and chamfer may be provided at the intersection. Here, the shape of the die is shown in FIG.
In FIG. 2, the die 1 connects a surface of the hexagonal pyramid 4 located on the inlet side with an outwardly curved portion 6 between the ridgelines 5 and a hexagonal prism body surface 3 located on the outlet side so as to cross each other. It has a processed surface. The intersection of the hexagonal pyramidal surface 2a having the curved portion 6 and the hexagonal prismatic surface 3 is chamfered by r of 2 mm in this example.

【0008】本発明のダイスにおいて、ダイスの中心軸
方向において、六角錐体の稜線間の面とダイスの中心軸
とのなす角度は、14°〜18°とすることが好まし
い。θが14°より小さくなると、、六角辺の角の充満
度が低下する。また、θが18°より大きくなると、材
料切れが発生し易くなる。この角度θを、図1、図2に
おいて示す。湾曲部を有する図2の場合には、ダイスの
軸方向に沿って、湾曲部の頂部を結ぶ線を基準とする。
In the die of the present invention, it is preferable that an angle between the surface between the ridgelines of the hexagonal pyramid and the center axis of the die is 14 ° to 18 ° in the direction of the center axis of the die. When θ is smaller than 14 °, the filling degree of the corners of the hexagonal side is reduced. Further, when θ is larger than 18 °, material breakage easily occurs. This angle θ is shown in FIGS. 1 and 2. In the case of FIG. 2 having a curved portion, a line connecting the tops of the curved portions along the axial direction of the die is used as a reference.

【0009】次に、本発明の製造方法により製造した六
角鋼管の結果を、上述した従来法のダイスによる場合と
対比して図3に例示する。この例において、肉厚T/外
径D≧0.10の鋼管を素材とし、対辺長さB40〜7
0mm、内径d30〜54.5mm、対辺部厚さt/対
辺長さB≧0.18〜0.19の六角鋼管を冷間引抜き
により製造したものであり、L1 は請求項1の場合、L
2 は請求項2の場合、L3 は従来法の場合をそれぞれ示
す。同一の対辺長さB、同一の(対辺部厚さt/対辺長
さB)に対して、本発明の六角鋼管の製造方法が、六角
辺の角のRの小さいものを安定的に得られることを示し
ている。(図3に関連して、B、D、tは、請求項1の
六角鋼管の製造方法により冷間引抜きする場合の例を示
す図4を参照。)
Next, the result of the hexagonal steel pipe manufactured by the manufacturing method of the present invention is illustrated in FIG. 3 in comparison with the case of the above-mentioned conventional die. In this example, a steel pipe having a wall thickness T / outer diameter D ≧ 0.10 is used as a raw material, and opposite side lengths B40 to 7 are used.
A hexagonal steel pipe having a diameter of 0 mm, an inner diameter d of 30 to 54.5 mm, a thickness t of the opposite side / a length B of the opposite side B ≧ 0.18 to 0.19 is produced by cold drawing, and L 1 is the case of claim 1. L
2 indicates the case of claim 2, and L 3 indicates the case of the conventional method. For the same opposite side length B and the same (the opposite side thickness t / the opposite side length B), the hexagonal steel pipe manufacturing method of the present invention can stably obtain a hexagonal side with a small R. It is shown that. (Relating to FIG. 3, B, D, and t are shown in FIG. 4, which shows an example in the case of cold drawing by the method for manufacturing a hexagonal steel pipe according to claim 1.)

【0010】[0010]

【作用】本発明は、肉厚T/外径D≧0.10の丸鋼管
を素材とし、冷間引抜きにより六角鋼管を製造する方法
において、ダイスが、該ダイスの中心軸に沿って、入口
側に位置する六角錐体面と、出口側に位置する六角柱体
面とを交差して連結した加工面、または入口側に位置す
る、六角錐体の稜線間に外方への湾曲部を付与した面
と、出口側に位置する六角柱体面とを交差して連結した
加工面を有するので、六角鋼管の六角辺の角の充満度を
向上する。
According to the present invention, in a method for producing a hexagonal steel pipe by cold drawing using a round steel pipe having a wall thickness T / outer diameter D ≧ 0.10 as a raw material, the die has an inlet along the center axis of the die. A hexagonal pyramid surface located on the side and a hexagonal prism surface located on the exit side are crossed and connected, or an outward curved portion is provided between the ridgelines of the hexagonal pyramid located on the entrance side. Since the surface and the hexagonal columnar surface located on the outlet side are crossed and connected, the filling degree of the corners of the hexagonal side of the hexagonal steel pipe is improved.

【0011】[0011]

【実施例】下記の表1に示すように、肉厚T9〜16.
5mm、外径D57〜89.1mmの丸鋼を素材とし、
対辺長さB41〜70mm、内径d21〜54mmの六
角鋼管を製造した。
EXAMPLES As shown in Table 1 below, the wall thicknesses T9 to 16.
Made of round steel with a diameter of 5 mm and an outside diameter of D57-89.1 mm,
A hexagonal steel pipe having an opposite side length B41 to 70 mm and an inner diameter d21 to 54 mm was manufactured.

【0012】[0012]

【表1】 表1に示す六角鋼管のコーナーR(mm)の結果を、従
来ダイスによる場合と対比して下記の表2に示す。
[Table 1] The results of the corner R (mm) of the hexagonal steel pipe shown in Table 1 are shown in Table 2 below in comparison with the case of using a conventional die.

【0013】[0013]

【表2】 表2により、本発明の六角鋼管の製造方法により、コー
ナーRの小さい製品を製造できることを示す。
[Table 2] Table 2 shows that a product having a small corner R can be manufactured by the method for manufacturing a hexagonal steel pipe of the present invention.

【0014】[0014]

【発明の効果】本発明は、以上のように構成するので、
六角形のコーナーRを極力小さく、六角辺の角をシャー
プに成形し、そのままナット等の用途に供することがで
きる六角鋼管を製造することができ、六角鋼管をナット
として使用する場合には締め付け時の空回りのないもの
を安定的に製造することができる。
Since the present invention is configured as described above,
The hexagonal corner R can be made as small as possible, and the corners of the hexagonal sides can be sharply shaped to produce a hexagonal steel pipe that can be used as it is for nuts and other applications. When using a hexagonal steel pipe as a nut, tighten it when tightening. It is possible to stably manufacture a non-idle product.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に使用するダイスを示す図である。
(イ)はダイスの中心軸に沿って切断した断面図、
(ロ)は同ダイスの入口側の正面図である。
FIG. 1 is a diagram showing a die used in the present invention.
(A) is a sectional view taken along the center axis of the die,
(B) is a front view of the entrance side of the die.

【図2】本発明に使用する別のダイスを示す図である。
(イ)はダイスの中心軸に沿って切断した断面図、
(ロ)は同ダイスの入口側の正面図である。
FIG. 2 is a view showing another die used in the present invention.
(A) is a sectional view taken along the center axis of the die,
(B) is a front view of the entrance side of the die.

【図3】本発明の六角鋼管の製造方法と、従来の技術と
により、六角鋼管の六角形のコーナーRを対比して示す
図である。
FIG. 3 is a view showing a hexagonal corner R of a hexagonal steel pipe in comparison by a conventional method and a method for producing a hexagonal steel pipe of the present invention.

【図4】(イ)は本発明に使用するダイスにより、六角
鋼管を冷間引抜きしている態様を示す図である。
(ロ)、(ハ)はそれぞれ(イ)におけるA−A視断面
図、B−B視断面図である。
FIG. 4 (a) is a view showing a mode in which a hexagonal steel pipe is cold drawn by a die used in the present invention.
(B) and (C) are a sectional view taken along the line A-A and a sectional view taken along the line BB of (A), respectively.

【図5】従来技術のダイスの形状を示す図である。
(イ)はダイスの中心軸に沿って切断した断面図、
(ロ)は同ダイスの入口側の正面図である。
FIG. 5 is a view showing a shape of a conventional die.
(A) is a sectional view taken along the center axis of the die,
(B) is a front view of the entrance side of the die.

【符号の説明】[Explanation of symbols]

1 ダイス 2 六角錐体面 2a 湾曲部を有する六角錐体面 3 六角柱体面 4 六角錐体 5 稜線 6 湾曲部 7 曲面 1 die 2 hexagonal pyramid surface 2a hexagonal pyramid surface having a curved portion 3 hexagonal prismatic body surface 4 hexagonal pyramid 5 ridge line 6 curved portion 7 curved surface

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 肉厚T/外径D≧0.10の丸鋼管を素
材とし、冷間引抜きにより六角鋼管を製造する方法にお
いて、ダイスの中心軸に沿って、入口側に位置する六角
錐体面と、出口側に位置する六角柱体面とを交差して連
結した加工面を有するダイスを用いることを特徴とする
六角鋼管の製造方法。
1. A method for producing a hexagonal steel pipe by cold drawing using a round steel pipe having a wall thickness T / outer diameter D ≧ 0.10 as a raw material, the hexagonal pyramid located on the inlet side along the center axis of the die. A method for producing a hexagonal steel pipe, comprising using a die having a machined surface in which a body surface and a hexagonal cylindrical body surface located on the outlet side are crossed and connected.
【請求項2】 肉厚T/外径D≧0.10の丸鋼管を素
材とし、冷間引抜きにより六角鋼管を製造する方法にお
いて、ダイスの中心軸に沿って、入口側に位置する、六
角錐体に稜線間に外方への湾曲部を付与した面と、出口
側に位置する六角柱体面とを交差して連結した加工面を
有するダイスを用いることを特徴とする六角鋼管の製造
方法。
2. A method for producing a hexagonal steel pipe by cold drawing using a round steel pipe having a wall thickness T / outer diameter D ≧ 0.10 as a raw material, the hexagonal steel pipe being located on the inlet side along the center axis of the die. A method for producing a hexagonal steel pipe, characterized by using a die having a processing surface in which a surface of a pyramid having an outwardly curved portion between ridges and a hexagonal prism surface located on the outlet side are connected to intersect each other. .
【請求項3】 ダイスの中心軸方向において、六角錐体
の稜線間の面とダイスの中心軸とのなす角度を14°〜
18°とした請求項1又は2記載の六角鋼管の製造方
法。
3. The angle between the center axis of the die and the surface between the ridgelines of the hexagonal pyramid in the direction of the center axis of the die is 14 ° to
The method for producing a hexagonal steel pipe according to claim 1 or 2, wherein the angle is 18 °.
JP4269204A 1992-09-14 1992-09-14 Hexagonal steel pipe manufacturing method Expired - Lifetime JP2527671B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4269204A JP2527671B2 (en) 1992-09-14 1992-09-14 Hexagonal steel pipe manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4269204A JP2527671B2 (en) 1992-09-14 1992-09-14 Hexagonal steel pipe manufacturing method

Publications (2)

Publication Number Publication Date
JPH0691326A true JPH0691326A (en) 1994-04-05
JP2527671B2 JP2527671B2 (en) 1996-08-28

Family

ID=17469127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4269204A Expired - Lifetime JP2527671B2 (en) 1992-09-14 1992-09-14 Hexagonal steel pipe manufacturing method

Country Status (1)

Country Link
JP (1) JP2527671B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11239817A (en) * 1998-02-25 1999-09-07 Mitsubishi Materials Corp Manufacture of special shaped tube
CN102716934A (en) * 2012-06-18 2012-10-10 山西太钢不锈钢股份有限公司 Method for forming large-diameter stainless steel square tube
CN103406375A (en) * 2013-08-23 2013-11-27 北京科技大学 Multi-blank closed type combination hole pattern drawing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11239817A (en) * 1998-02-25 1999-09-07 Mitsubishi Materials Corp Manufacture of special shaped tube
CN102716934A (en) * 2012-06-18 2012-10-10 山西太钢不锈钢股份有限公司 Method for forming large-diameter stainless steel square tube
CN103406375A (en) * 2013-08-23 2013-11-27 北京科技大学 Multi-blank closed type combination hole pattern drawing method

Also Published As

Publication number Publication date
JP2527671B2 (en) 1996-08-28

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