JP2812151B2 - Cold drawing method for steel pipe - Google Patents
Cold drawing method for steel pipeInfo
- Publication number
- JP2812151B2 JP2812151B2 JP17502693A JP17502693A JP2812151B2 JP 2812151 B2 JP2812151 B2 JP 2812151B2 JP 17502693 A JP17502693 A JP 17502693A JP 17502693 A JP17502693 A JP 17502693A JP 2812151 B2 JP2812151 B2 JP 2812151B2
- Authority
- JP
- Japan
- Prior art keywords
- lubricating oil
- tube
- mandrel
- ring
- raw
- 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.)
- Expired - Lifetime
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- Metal Extraction Processes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼管の冷間抽伸方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cold drawing a steel pipe.
【０００２】[0002]
【従来の技術】鋼管の冷間抽伸における潤滑処理は、化
成皮膜処理が主流であるが、薬品コスト、工数、公害環
境対策などの面で問題があり、油潤滑による方法へと移
行しつつある。油潤滑を用いる方法には事前浸漬する方
法、直接滴下する方法に大別できる。このうちの事前浸
漬する方法は、油切りが十分にできないため、油の原単
位や作業環境に問題があるので、直接滴下する方法が有
利である。2. Description of the Related Art Chemical lubrication treatment is the mainstream lubrication treatment in cold drawing of steel pipes. However, there are problems in terms of chemical cost, man-hours, pollution control measures, etc., and the method is shifting to oil lubrication. . Methods using oil lubrication can be broadly classified into a pre-immersion method and a direct dropping method. Of these methods, the method of pre-immersion is insufficient in oil drainage, and thus has a problem in the unit consumption of oil and the working environment. Therefore, the method of direct dropping is advantageous.
【０００３】ところで、直接滴下する方法は、管外面
は、ダイス手前でノズルより潤滑油を滴下し、管内面
は、中空化したマンドレルを通して潤滑油をその先端に
取り付けたプラグ元部へ供給する方法である。しかし、
この直接滴下する方法による鋼管内面への潤滑油の塗布
は、鋼管内面への均一塗布が困難であり、事前に鋼管内
面への潤滑油の均一塗布が必要となる。By the way, the direct dropping method is a method in which lubricating oil is dripped from a nozzle in front of a die on the outer surface of the tube, and lubricating oil is supplied to a plug base attached to the tip of the tube through a hollow mandrel. It is. But,
It is difficult to apply the lubricating oil to the inner surface of the steel pipe by the direct dropping method, and it is difficult to uniformly apply the lubricating oil to the inner surface of the steel pipe in advance.
【０００４】上記の問題点を解決する方法として、抽伸
に先立ち素管内面の口付け端側所要部位に高粘度潤滑油
を塗布して抽伸する方法を特開昭６０−２４７４１０号
公報で、また高粘度潤滑油を先端が口付けされた鋼管の
後端から装入する方法が特公平３−６７４４７号公報で
提案されている。As a method for solving the above-mentioned problems, a method of applying high-viscosity lubricating oil to a required portion on the mouth end side of a raw tube prior to drawing and performing drawing is disclosed in Japanese Patent Application Laid-Open No. 60-247410. Japanese Patent Publication No. 3-6747 proposes a method of charging a viscous lubricating oil from the rear end of a steel pipe having a front end.
【０００５】[0005]
【発明が解決しようとする課題】ところが、特開昭６０
−２４７４１０号公報で提案されている方法は、事前に
高粘度潤滑油（例えば４０ OＣで１０００〜３０００Ｃ
ｓｔのもの）を素管内面の口付け端側所要部位に作業者
が塗布する作業が必要になる等取扱いが不便である。ま
た、特公平３−６７４４７号公報で提案されている方法
においても高粘度潤滑油を使用しているので、潤滑油の
供給に用いられるポンプに高出力が要求され、設備が大
型化する。However, Japanese Unexamined Patent Publication No.
The method proposed in -247410 discloses in advance to the high viscosity lubricating oil (e.g. at 40 O C 1000~3000C
This is inconvenient in handling, for example, because an operator needs to apply the (st) to a required portion on the mouth end side of the inner surface of the raw tube. Also, in the method proposed in Japanese Patent Publication No. 3-6747, since a high-viscosity lubricating oil is used, a high output is required for a pump used for supplying the lubricating oil, and the equipment is enlarged.
【０００６】前記したような問題は、低粘度潤滑油を採
用すれば有利ではあるが、低粘度潤滑油（例えば４０ O
Ｃで１００Ｃｓｔのもの）を上記の方法に用いると、先
ず特開昭６０−２４７４１０号公報による方法では、口
絞り部先端より潤滑油の流出が発生する。また、特公平
３−６７４４７号公報による方法では、潤滑油が素管先
端まで届かず、素管後端部に残留したり、後端部より流
出する。そのため、抽伸するのに必要な潤滑油が素管内
面に供給されなくなり、内面への均一塗布が十分でな
く、鋼管内面に焼付疵が発生したり、プラグ寿命が低下
したりするなどの問題がある。[0006] The problems as described, albeit advantageously by employing a low viscosity lubricating oil, but low viscosity lubricant (e.g. 40 O
When C (100 Cst) is used in the above method, first, in the method disclosed in Japanese Patent Application Laid-Open No. 60-247410, the lubricating oil flows out from the tip of the orifice. Further, according to the method disclosed in Japanese Patent Publication No. 3-6747, the lubricating oil does not reach the front end of the pipe, but remains at the rear end of the pipe or flows out from the rear end. As a result, the lubricating oil required for drawing is no longer supplied to the inner surface of the raw tube, and the uniform application to the inner surface is not sufficient, causing problems such as the occurrence of seizure flaws on the inner surface of the steel tube and shortening of the plug life. is there.
【０００７】そこで、本発明の目的は、上記した問題点
を解消し、低粘度潤滑油を使用した場合でも鋼管内面に
焼付疵が発生せず、プラグの長寿命化が可能な鋼管の冷
間抽伸方法を提供することである。Accordingly, an object of the present invention is to solve the above-mentioned problems and to prevent the occurrence of seizure flaws on the inner surface of a steel pipe even when a low-viscosity lubricating oil is used, and to provide a cold-rolled steel pipe having a longer life. It is to provide a drawing method.
【０００８】[0008]
【課題を解決するための手段】上記した目的を達成する
ために、第１の本発明は、素管の内外面に潤滑油を供給
してプラグ使用抽伸を行う場合において、抽伸前に素管
内面に潤滑油を供給した後、マンドレルの先端に取り付
けたプラグの後方所定位置に素管内面との隙間が０．５
〜４ｍｍとなる外径のリングを装着したマンドレルを素
管後端から挿入し、前記予め供給した潤滑油をリングに
よって素管内面に塗布しつつ先端側に押し込んだ後に冷
間抽伸するのである。According to a first aspect of the present invention, a lubricating oil is supplied to the inner and outer surfaces of a raw tube to perform drawing using a plug. After supplying the lubricating oil to the surface, the gap between the inner surface of the raw pipe and the plug at the predetermined position behind the plug attached to the tip of the mandrel is 0.5
A mandrel equipped with a ring having an outer diameter of about 4 mm is inserted from the rear end of the raw tube, and the pre-supplied lubricating oil is applied to the inner surface of the raw tube by the ring, pushed into the front end side, and then cold drawn.
【０００９】さらに、第２の本発明は、第１の本発明に
おいて、マンドレルの素管後端からの挿入時、マンドレ
ル内を通してプラグとリング間から素管内面に潤滑油を
供給するのである。Further, according to a second aspect of the present invention, in the first aspect of the present invention, when the mandrel is inserted from the rear end of the raw tube, the lubricating oil is supplied to the inner surface of the raw tube from between the plug and the ring through the inside of the mandrel.
【００１０】また、第３の本発明は、素管の内外面に潤
滑油を供給してプラグ使用抽伸を行う場合において、マ
ンドレルの先端に取り付けたプラグの後方所定位置に素
管内面との隙間が０．５〜４ｍｍとなる外径のリングを
装着したマンドレルを素管後端から挿入し、マンドレル
内を通してリングの後方から素管内面に潤滑油を供給し
ながら冷間抽伸するのである。[0010] In a third aspect of the present invention, when a lubricating oil is supplied to the inner and outer surfaces of the raw tube to perform drawing using a plug, a gap between the inner surface of the raw tube and a predetermined position behind the plug attached to the tip of the mandrel is provided. A mandrel equipped with a ring having an outer diameter of 0.5 to 4 mm is inserted from the rear end of the raw tube, and cold drawing is performed while supplying lubricating oil to the inner surface of the raw tube from behind the ring through the mandrel.
【００１１】なお、本発明において、マンドレルに装着
したリングの外径を素管内面との隙間が０．５〜４ｍｍ
となるとしたのは、リングの外径と素管内面との隙間が
０．５ｍｍ未満であると第１・第２の発明では素管内面
に塗布した潤滑油の膜厚が薄くなりすぎ、マンドレル挿
入時に口絞り部先端から流出し、また第３の発明では素
管内面に潤滑油が均一に塗布されることなく素管後端か
ら流出するからである。またリングの外径と素管内面と
の隙間が４ｍｍを越えると潤滑油が素管内面に均一に塗
布されなくなるからである。In the present invention, the outer diameter of the ring mounted on the mandrel is adjusted so that the gap between the inner surface of the raw pipe and the inner diameter of the ring is 0.5 to 4 mm.
The reason is that if the gap between the outer diameter of the ring and the inner surface of the tube is less than 0.5 mm, the film thickness of the lubricating oil applied to the inner surface of the tube becomes too thin in the first and second inventions, and the mandrel This is because during the insertion, the oil flows out from the front end of the mouth drawing portion, and in the third invention, the lubricating oil flows out from the rear end of the raw tube without being uniformly applied to the inner surface of the raw tube. Also, if the gap between the outer diameter of the ring and the inner surface of the tube exceeds 4 mm, the lubricating oil will not be uniformly applied to the inner surface of the tube.
【００１２】[0012]
【作用】本発明は、抽伸前に素管内面に潤滑油を供給し
た後、マンドレルの先端に取り付けたプラグに後方所定
位置に素管内面との隙間が０．５〜４ｍｍとなる外径の
リングを装着したマンドレルを素管後端から挿入し、前
記予め供給した潤滑油をリングによって素管内面に潤滑
油を延ばしながら塗布しつつ先端側に押し込むので、素
管内面に均一厚さの油膜が形成される。According to the present invention, the lubricating oil is supplied to the inner surface of the raw tube before drawing, and then the plug attached to the tip of the mandrel is positioned at a predetermined position behind the outer diameter of the outer tube so that the gap with the inner surface of the raw tube becomes 0.5 to 4 mm. The mandrel equipped with the ring is inserted from the rear end of the base tube, and the pre-supplied lubricating oil is applied to the inner surface of the base tube while spreading while applying the lubricating oil by the ring, and is pushed into the front end side. Is formed.
【００１３】また、マンドレルの素管後端からの挿入時
に、マンドレル内を通してプラグとリングの間から素管
内面に潤滑油を供給する、若しくはマンドレル内を通し
てリングの後方から素管内面に潤滑油を供給すると、マ
ンドレルの素管後端からの挿入前に素管内面へ潤滑油を
供給しなくても抽伸とともに均一塗布が可能となる。When the mandrel is inserted from the rear end of the pipe, lubricating oil is supplied to the inner surface of the pipe through the mandrel from between the plug and the ring, or supplied to the inner surface of the pipe from behind the ring through the mandrel. When the lubricating oil is supplied, even if the lubricating oil is not supplied to the inner surface of the raw tube before the mandrel is inserted from the rear end of the raw tube, it is possible to perform the drawing and the uniform application.
【００１４】[0014]
【実施例】以下、本発明の一実施例を添付した図面に基
づいて説明する。図１は第１の本発明の概要を示す図
で、（ａ）は潤滑油を素管内面に供給している状態、
（ｂ）はリングを装着したマンドレルを素管に挿入して
いる状態、図２は第２の本発明の構成の概要を示す図
で、図３は第３の本発明の構成の概要を示す図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a view showing an outline of a first invention, in which (a) shows a state in which lubricating oil is supplied to the inner surface of a raw pipe,
(B) is a state in which a mandrel with a ring attached is inserted into a raw tube, FIG. 2 is a diagram showing an outline of the configuration of the second invention, and FIG. 3 is an outline of a configuration of the third invention. FIG.
【００１５】本発明の抽伸方法を図１に基づいて説明す
る。 抽伸される素管１に油供給管２１を挿入し、素管１の
内面に所定量の潤滑油を滴下する。 素管１内面と０．５〜４ｍｍの隙間を有する外径のリ
ング６をプラグ３の後方所定位置に設けたマンドレル４
を素管１の後端側から挿入する。この時、リング６によ
って素管１内面に均一な厚さの潤滑油膜が形成されつ
つ、先端側に押し込まれる。 プラグ３がダイスまで挿入された後に、素管１の外面
に潤滑油を連続供給しながら素管１を冷間抽伸する。The drawing method of the present invention will be described with reference to FIG. The oil supply pipe 21 is inserted into the raw pipe 1 to be drawn, and a predetermined amount of lubricating oil is dropped on the inner surface of the raw pipe 1. A mandrel 4 having an outer diameter ring 6 having a gap of 0.5 to 4 mm at a predetermined position behind the plug 3 with an inner surface of the base tube 1.
Is inserted from the rear end side of the raw tube 1. At this time, the lubricating oil film having a uniform thickness is formed on the inner surface of the raw tube 1 by the ring 6 and pushed into the distal end side. After the plug 3 is inserted into the die, the raw tube 1 is cold drawn while continuously supplying lubricating oil to the outer surface of the raw tube 1.
【００１６】図２において、１は抽伸される素管、２は
ダイス、３はプラグ、４はプラグ３を支持するマンドレ
ルであり、プラグ３元部に位置するマンドレル４には潤
滑油を素管１内面に供給する油供給ノズル５を設けてい
る。また、前記油供給ノズル５の直後のマンドレル４位
置には、素管１内面と０．５〜４ｍｍの隙間を有する外
径のリング６を設けている。In FIG. 2, reference numeral 1 denotes a base tube to be drawn, 2 denotes a die, 3 denotes a plug, 4 denotes a mandrel for supporting the plug 3, and lubricating oil is supplied to a mandrel 4 located at the base of the plug 3. 1 is provided with an oil supply nozzle 5 for supplying to the inner surface. At the position of the mandrel 4 immediately after the oil supply nozzle 5, a ring 6 having an outer diameter having a gap of 0.5 to 4 mm from the inner surface of the raw tube 1 is provided.
【００１７】７は管外面用油タンクであり、ポンプ８に
よって配管１１を通り、ダイス２手前に設けられた図示
しないノズルから素管１の外面に潤滑油を塗布する。同
様に、管内面用油タンク９に貯蔵されている潤滑油は、
ポンプ１０によってマンドレル４内への配管１２を通
り、油供給ノズル５から素管１の内面に塗布される。Reference numeral 7 denotes a pipe outer surface oil tank, which applies lubricating oil to the outer surface of the raw tube 1 from a nozzle (not shown) provided in front of the die 2 through a pipe 11 by a pump 8. Similarly, the lubricating oil stored in the pipe inner surface oil tank 9 is:
The oil is supplied from the oil supply nozzle 5 to the inner surface of the raw tube 1 through a pipe 12 into the mandrel 4 by a pump 10.
【００１８】第２の本発明は以上説明した構成をしてお
り、素管１の後端からプラグ３をダイス２まで挿入す
る。この時、ポンプ１０を作動して素管１の内面に潤滑
油を滴下し、リング６によって素管１の内面全周に均一
な厚みをもつ潤滑油の膜を形成しつつ素管１の先端側に
押し込む。そして、プラグ３が素管１内をダイス２まで
挿入された後に、管外面用油タンク７から潤滑油を素管
１の外面に供給しながら素管１の抽伸を行う。According to the second aspect of the present invention, the plug 3 is inserted from the rear end of the raw tube 1 to the die 2. At this time, the lubricating oil is dropped on the inner surface of the raw tube 1 by operating the pump 10, and a film of the lubricating oil having a uniform thickness is formed on the entire inner surface of the raw tube 1 by the ring 6, and the leading end of the raw tube 1 is formed. Push into the side. Then, after the plug 3 is inserted into the tube 1 up to the die 2, the tube 1 is drawn while lubricating oil is supplied from the tube outer surface oil tank 7 to the outer surface of the tube 1.
【００１９】図３において、１は抽伸される素管、２は
ダイス、３はプラグ、４はプラグ３を支持するマンドレ
ルであり、プラグ３元部に位置するマンドレル４に素管
１内面と０．５〜４ｍｍの隙間を有する外径のリング６
を設けている。また、前記リング６の直後のマンドレル
４位置には、潤滑油を素管１内面に供給する油供給ノズ
ル５を設けている。In FIG. 3, reference numeral 1 denotes a base tube to be drawn, reference numeral 2 denotes a die, reference numeral 3 denotes a plug, reference numeral 4 denotes a mandrel for supporting the plug 3, and a mandrel 4 located at the base of the plug 3 and an inner surface of the base tube 1 Outer diameter ring 6 with a gap of 0.5 to 4 mm
Is provided. An oil supply nozzle 5 for supplying lubricating oil to the inner surface of the raw tube 1 is provided at a position of the mandrel 4 immediately after the ring 6.
【００２０】第３の本発明は以上説明した構成をしてお
り、素管１の後端からプラグ３をダイス２まで挿入した
後に、ポンプを作動して管外面用油タンク・管内面用油
タンクから素管１の内外面に潤滑油を供給しながら素管
１の抽伸を行う。この時、油供給ノズル５から供給され
た潤滑油はリング６によって素管１内面全周に均一な厚
みの膜を形成する。The third aspect of the present invention is constructed as described above. After the plug 3 is inserted from the rear end of the raw tube 1 to the die 2, the pump is operated to operate the oil tank for the pipe outer surface and the oil for the pipe inner surface. The drawing of the tube 1 is performed while supplying lubricating oil from the tank to the inner and outer surfaces of the tube 1. At this time, the lubricating oil supplied from the oil supply nozzle 5 forms a film having a uniform thickness on the entire inner surface of the base tube 1 by the ring 6.
【００２１】図４に示すように材質ＪＩＳ Ｇ ３４６
１に規定された材質ＳＴＢ３４０の素管（外径φ８８．
９ｍｍ×内径φ８０．０ｍｍ×長さ１０ｍ）の内面に潤
滑油を素管１本当たり３００ｃｃ、事前に供給した後、
素管内に幅５ｍｍのウレタン製のリングを備えたマンド
レルを挿入した前記供給した潤滑油をリングによって均
一塗布しつつ先端側に押し込み、その後抽伸した結果
（抽伸寸法：外径φ７５．０ｍｍ×内径φ６７．０ｍｍ
×長さ１３ｍ）を次の表１・２に示す。As shown in FIG. 4, the material is JIS G 346.
1 of the material STB340 (outer diameter φ88.
After lubricating oil is supplied to the inner surface of 9 mm x inner diameter 80.0 mm x length 10 m) in advance, 300 cc per raw tube,
The supplied lubricating oil in which a mandrel provided with a urethane ring having a width of 5 mm was inserted into the base tube and uniformly applied by the ring and pushed into the distal end side, followed by drawing (result of drawing: outer diameter φ75.0 mm × inner diameter φ67) 0.0mm
× 13 m) are shown in Tables 1 and 2 below.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】上記表１・２に示すように、リングの外面
と素管内面との隙間を０．５ｍｍ未満にすると、マンド
レル挿入時に、素管内面に塗布した潤滑油が口絞り部先
端から流出し、油切れを起こして内面に焼付疵が発生す
る。また、リングの外面と素管内面との隙間が４ｍｍを
越えると、潤滑油が素管先端まで均一に流れず、内面に
形成した油膜の厚みが不均一となって内面に焼付疵が発
生する。これに対して、リングの外面と素管内面との隙
間を０．５ｍｍ以上４ｍｍ以下にすると良好な抽伸を行
えた。As shown in Tables 1 and 2 above, if the gap between the outer surface of the ring and the inner surface of the tube is made smaller than 0.5 mm, the lubricating oil applied to the inner surface of the tube flows out of the tip of the mouth drawing portion when the mandrel is inserted. Then, the oil runs out and seizure flaws occur on the inner surface. If the gap between the outer surface of the ring and the inner surface of the tube exceeds 4 mm, the lubricating oil does not flow evenly to the tip of the tube, the thickness of the oil film formed on the inner surface becomes uneven, and seizure flaws are generated on the inner surface. . On the other hand, when the gap between the outer surface of the ring and the inner surface of the tube was set to 0.5 mm or more and 4 mm or less, good drawing was performed.
【００２５】第３の本発明方法により、材質ＪＩＳ Ｇ
３４４５に規定された材質ＳＴＫＭ１１Ａの素管（外
径φ１０１．６ｍｍ×内径φ８９．６ｍｍ×長さ１０
ｍ）に幅５０ｍｍのウレタン製のリングを備えたマンド
レルを挿入し、油供給ノズル（φ３穴×６個）から潤滑
油（３００ｃｃ／分）を素管内面に供給しながら抽伸を
行った結果を次の表３に示す。According to the third method of the present invention, the material JIS G
A raw material tube of material STKM11A specified in 3445 (outer diameter φ101.6 mm × inner diameter φ89.6 mm × length 10
m), a mandrel equipped with a urethane ring having a width of 50 mm was inserted, and drawing was performed while lubricating oil (300 cc / min) was supplied from the oil supply nozzle (φ3 holes × 6) to the inner surface of the base tube. The results are shown in Table 3 below.
【００２６】[0026]
【表３】 [Table 3]
【００２７】上記表３に示すように、素管内面との隙間
を０．５ｍｍ以上４ｍｍ以下の外径のリングを取り付け
たマンドレルを素管に挿入した後に、素管内外面に潤滑
油を供給しながら抽伸を行うと良好な結果が得られる。As shown in Table 3 above, after inserting a mandrel with a ring having an outer diameter of 0.5 mm or more and 4 mm or less into the tube, a lubricating oil was supplied to the inner and outer surfaces of the tube. Good results can be obtained when drawing is performed.
【００２８】[0028]
【発明の効果】以上説明したように、本発明によれば、
高粘度の潤滑油のみならず低粘度の潤滑油を使用しても
素管内面に潤滑油の厚さが均一な膜を形成できるので、
素管内面に発生する焼付疵及びプラグ寿命の低下を防ぐ
ことができる。また、低粘度の潤滑油を使用できるの
で、ポンプなど設備の小型化を図ることが可能である。As described above, according to the present invention,
Even when using not only high-viscosity lubricating oil but also low-viscosity lubricating oil, a uniform thickness of lubricating oil can be formed on the inner surface of the pipe.
Seizure flaws generated on the inner surface of the raw tube and a reduction in plug life can be prevented. Further, since a low-viscosity lubricating oil can be used, it is possible to reduce the size of equipment such as a pump.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の概要を示す図で（ａ）は潤滑油を素管
内面に供給している状態、（ｂ）はリングを装着したマ
ンドレルを素管に挿入している状態である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an outline of the present invention, in which (a) shows a state in which lubricating oil is supplied to the inner surface of a tube, and (b) shows a state in which a mandrel equipped with a ring is inserted into the tube.
【図２】第２の本発明の構成の概要を示す図である。FIG. 2 is a diagram showing an outline of a configuration of a second present invention.
【図３】第３の本発明の構成の概要を示す図である。FIG. 3 is a diagram showing an outline of a configuration of a third invention.
【図４】実験に用いた本発明の構成を示す図である。FIG. 4 is a diagram showing a configuration of the present invention used in an experiment.
【符号の説明】 １ 素管 ２ ダイス ３ プラグ ４ マンドレル ５ 油供給ノズル ６ リング[Description of Signs] 1 Raw tube 2 Dice 3 Plug 4 Mandrel 5 Oil supply nozzle 6 Ring
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−204114（ＪＰ，Ａ) 特開 昭63−104717（ＪＰ，Ａ) 特開 昭58−116923（ＪＰ，Ａ) 特開 昭57−160515（ＪＰ，Ａ) 実開 昭60−176810（ＪＰ，Ｕ) 実公 昭43−23712（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.6，ＤＢ名) B21C 9/00 B21C 1/00──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-204114 (JP, A) JP-A-63-104717 (JP, A) JP-A-58-116923 (JP, A) JP-A 57-104 160515 (JP, A) Japanese Utility Model Showa 60-176810 (JP, U) Japanese Utility Model Showa 43-23712 (JP, Y1) (58) Fields investigated (Int. Cl. 6 , DB name) B21C 9/00 B21C 1 / 00
Claims (3)
使用抽伸を行う場合において、抽伸前に素管内面に潤滑
油を供給した後、マンドレルの先端に取り付けたプラグ
の後方所定位置に素管内面との隙間が０．５〜４ｍｍと
なる外径のリングを装着したマンドレルを素管後端から
挿入し、前記予め供給した潤滑油をリングによって素管
内面に塗布しつつ先端側に押し込んだ後に冷間抽伸する
ことを特徴とする鋼管の冷間抽伸方法。When a plug is drawn by supplying lubricating oil to the inner and outer surfaces of a raw tube, lubricating oil is supplied to the inner surface of the raw tube before drawing, and then a predetermined position behind the plug attached to the tip of the mandrel. A mandrel equipped with a ring having an outer diameter of 0.5 to 4 mm is inserted from the rear end of the base tube into the base tube, and the pre-supplied lubricating oil is applied to the base tube inner surface by the ring while the mandrel is attached to the front side. A cold drawing method for a steel pipe, comprising:
マンドレル内を通してプラグとリングの間から素管内面
に潤滑油を供給することを特徴とする請求項１記載の鋼
管の冷間抽伸方法。2. When the mandrel is inserted from the rear end of the base tube,
2. The cold drawing method for a steel pipe according to claim 1, wherein lubricating oil is supplied to the inner surface of the raw pipe from between the plug and the ring through the inside of the mandrel.
使用抽伸を行う場合において、マンドレルの先端に取り
付けたプラグの後方所定位置に素管内面との隙間が０．
５〜４ｍｍとなる外径のリングを装着したマンドレルを
素管後端から挿入し、マンドレル内を通してリングの後
方から素管内面に潤滑油を供給しながら冷間抽伸するこ
とを特徴とする鋼管の冷間抽伸方法。3. When a lubricating oil is supplied to the inner and outer surfaces of the raw tube to perform drawing using a plug, a gap between the inner surface of the raw tube and the inner surface of the raw tube is set at a predetermined position behind the plug attached to the tip of the mandrel.
A steel pipe characterized in that a mandrel equipped with a ring having an outer diameter of 5 to 4 mm is inserted from the rear end of the raw pipe, and cold drawing is performed while supplying lubricating oil to the inner surface of the raw pipe from the rear of the ring through the mandrel. Cold drawing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17502693A JP2812151B2 (en) | 1993-07-15 | 1993-07-15 | Cold drawing method for steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17502693A JP2812151B2 (en) | 1993-07-15 | 1993-07-15 | Cold drawing method for steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0732030A JPH0732030A (en) | 1995-02-03 |
| JP2812151B2 true JP2812151B2 (en) | 1998-10-22 |
Family
ID=15988922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17502693A Expired - Lifetime JP2812151B2 (en) | 1993-07-15 | 1993-07-15 | Cold drawing method for steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2812151B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5154851B2 (en) * | 2007-07-20 | 2013-02-27 | 昭和電工株式会社 | Metal tube drawing device and drawing method |
| JP5154861B2 (en) * | 2007-08-22 | 2013-02-27 | 昭和電工株式会社 | Metal tube drawing device and drawing method |
| JP5512341B2 (en) * | 2010-03-19 | 2014-06-04 | 昭和電工株式会社 | Drawing method of metal pipe |
| JP5661494B2 (en) * | 2011-02-10 | 2015-01-28 | 昭和電工株式会社 | Metal tube drawing method and drawing apparatus |
| JP5426701B2 (en) * | 2012-02-06 | 2014-02-26 | 昭和電工株式会社 | Metal tube drawing device and drawing method |
| JP7343780B2 (en) * | 2020-01-15 | 2023-09-13 | 日本製鉄株式会社 | Metal tube inner surface resin coating equipment |
| CN112024619A (en) * | 2020-09-04 | 2020-12-04 | 江苏武进不锈股份有限公司 | Online oil injection lubricating system of small-caliber cold pipe blank unit |
| CN112024620A (en) * | 2020-09-04 | 2020-12-04 | 江苏武进不锈股份有限公司 | Online oil injection lubrication system for large diameter cold tube blank unit |
-
1993
- 1993-07-15 JP JP17502693A patent/JP2812151B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0732030A (en) | 1995-02-03 |
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