JP3458712B2 - Perforated plug - Google Patents
Perforated plugInfo
- Publication number
- JP3458712B2 JP3458712B2 JP17485098A JP17485098A JP3458712B2 JP 3458712 B2 JP3458712 B2 JP 3458712B2 JP 17485098 A JP17485098 A JP 17485098A JP 17485098 A JP17485098 A JP 17485098A JP 3458712 B2 JP3458712 B2 JP 3458712B2
- Authority
- JP
- Japan
- Prior art keywords
- plug
- perforation
- cooling
- mandrel bar
- piercing
- 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 - Fee Related
Links
Landscapes
- Extrusion Of Metal (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、広くは継目無鋼
管の製造技術に関し、特にピアサーあるいはエロンゲー
タ用のプラグ外表面の冷却手段を備えた穿孔プラグと、
その穿孔プラグの冷却方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a technique for producing a seamless steel pipe, and more particularly to a piercing plug provided with cooling means for the outer surface of the plug for a piercer or an elongator,
The present invention relates to a method for cooling the perforated plug.
【０００２】[0002]
【従来の技術】マンネスマンミル方式による継目無鋼管
の製造は通常以下の手順で行われる。
（１）丸鋼片（以下、「ビレット」という）を加熱炉で
約１１００〜１３００℃付近に加熱する。（２）第一穿
孔機（以下、「ピアサー」という）でプラグによって穿
孔され中空素管（以下、「ホローシェル」という）とな
す。（３）第二穿孔機（以下、「エロンゲータ」とい
う）のプラグでホローシェルを拡管、延伸する。これら
のピアサーによるビレットの穿孔とエロンゲータによる
ホローシェルの拡管・延伸により、プラグはビレットや
ホローシェルとの接触及び摩擦熱によって熱を受け高温
となり、プラグの表面に溶損、えぐれ等の障害が発生し
連続使用が不可能となる。中でも高クロム鋼等の高合金
鋼継目無管製造時は普通鋼にくらべ耐用度が極端に低
く、これまでにプラグの外面冷却やプラグ内面に冷却水
を送り込んで冷却することによって、耐用度の向上が行
われてきた。2. Description of the Related Art The manufacture of a seamless steel pipe by the Mannesmann mill system is usually carried out by the following procedure. (1) A round billet (hereinafter referred to as "billet") is heated to about 1100 to 1300 ° C in a heating furnace. (2) A hollow shell (hereinafter referred to as "hollow shell") is formed by punching with a plug by a first perforator (hereinafter referred to as "piercer"). (3) The hollow shell is expanded and stretched with the plug of the second punching machine (hereinafter referred to as "elongator"). Due to the piercing of the billet by the piercer and the expansion / stretching of the hollow shell by the elongator, the plug is exposed to heat due to contact with the billet and hollow shell and frictional heat, and the plug surface is subject to melting damage, engraving, etc. Cannot be used. Above all, when manufacturing seamless pipes of high alloy steel such as high chromium steel, the durability is extremely lower than that of ordinary steel, and the durability has been improved by cooling the outer surface of the plug and cooling water by sending cooling water to the inner surface of the plug. Improvements have been made.
【０００３】これらの先行技術としては、特開昭５８−
１６８４０５号公報及び特開昭６１−２１９４０４号公
報のプラグ外表面に冷却水を噴射させるべくマンドレル
バー内に冷却水を通水し、プラグ先端から冷却水を噴射
させる方法（先行技術１）、特開平３−１２４３０５号
公報のプラグ先端にＳＳ材を中心とした薄い被覆材を覆
う方法（先行技術２）、特開平３−２９１１０６号公報
のプラグ内部に冷却水を送り、そのプラグ内部に凹凸を
設けて、伝熱面積を増やし内面冷却を促進させる方法
（先行技術３）、特開平８−１１７８１７号公報のプラ
グとマンドレルバーを数本設けて、穿孔毎にマンドレル
バーを交換し、マンドレルバー全体を冷却する方法（先
行技術４）、及び特開平１０−４３８０４号公報のプラ
グ肉厚断面部内に冷却孔をプラグの周方向に所定間隔で
設けて、冷却孔に冷却液を送り込んで冷却する方法（先
行技術５）がそれぞれあった。As the prior art of these, Japanese Patent Laid-Open No. 58-58-
No. 168405 and JP-A No. 61-219404, a method of passing cooling water through a mandrel bar to inject the cooling water onto the outer surface of the plug and ejecting the cooling water from the tip of the plug (prior art 1), A method of covering a thin coating material centered on SS material on the tip of the plug of Japanese Patent Laid-Open No. 3-124305 (Prior Art 2), cooling water is fed into the plug of Japanese Patent Laid-Open No. 3-291106, and irregularities are formed inside the plug. By providing a method for increasing the heat transfer area to promote inner surface cooling (Prior Art 3), several plugs and mandrel bars of Japanese Patent Laid-Open No. 8-117817 are provided, and the mandrel bar is replaced for each perforation, and the entire mandrel bar is provided. Cooling method (Prior Art 4), and cooling holes are provided at predetermined intervals in the circumferential direction of the plug in the cross-section of the plug wall thickness of JP-A-10-43804. Method of cooling by feeding the liquid (prior art 5) had respectively.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、先行技
術１では、穿孔中に噴射孔が閉塞されるため冷却水の供
給が定常的に行われず、プラグ内面を冷却する効果は殆
どなかった。また、この方法では不必要にビレット自身
が冷却されるという問題があった。先行技術２ではプラ
グ先端にＳＳ材を被覆して、穿孔中のプラグとビレット
との潤滑をよくしたものの、プラグは冷却していないの
で、穿孔の度にプラグの温度は上昇しプラグの変形や摩
耗は逃れられず、大幅な耐用度の向上にはつながらなか
った。先行技術３ではプラグ内面の凹凸によって伝熱面
積は増加したが、プラグの寿命を左右するプラグ表面温
度までを下げる効果はなかった。また、凹凸をつけても
伝熱面積的には１．５倍程度が限界であり、冷却促進効
果には限界があった。However, in the prior art 1, since the injection hole is closed during drilling, the cooling water is not constantly supplied, and there is almost no effect of cooling the inner surface of the plug. Further, this method has a problem that the billet itself is unnecessarily cooled. In Prior Art 2, although the plug tip was coated with SS material to improve lubrication between the plug and the billet during drilling, the plug was not cooled, so the temperature of the plug increased each time drilling and the plug was deformed or deformed. The wear could not escape and did not lead to a significant improvement in durability. In Prior Art 3, the heat transfer area increased due to the unevenness of the inner surface of the plug, but there was no effect of lowering the surface temperature of the plug, which affects the life of the plug. In addition, even if unevenness was provided, the heat transfer area was limited to about 1.5 times, and the cooling promotion effect was limited.
【０００５】先行技術４では、プラグの冷却は確実に行
えるが、設備費が高価であり、かつ、メンテナンス等の
経費がかかりすぎる問題がある。また、マンドレルバー
を交換のために圧延効率を阻害していた。先行技術５で
は、プラグ断面内に冷却孔を設けることによって、プラ
グの温度を下げることはできるが、プラグ表面の温度を
下げるにはプラグ表面近くに冷却孔が必要となり、湾曲
部の強い先端部は冷却孔を表面近くに設けることが難し
い。また、冷却孔を設ける加工が難しくプラグの製造費
が従来プラグの３倍以上かかる問題があった。In the prior art 4, although the plug can be surely cooled, there is a problem that the equipment cost is high and the maintenance cost is too high. Further, the mandrel bar was replaced, which hindered the rolling efficiency. In the prior art 5, the temperature of the plug can be lowered by providing the cooling hole in the cross section of the plug, but in order to lower the temperature of the plug surface, the cooling hole is required near the plug surface, and the tip portion having a strong curved portion is required. It is difficult to provide cooling holes near the surface. Further, there is a problem that it is difficult to form the cooling hole and the manufacturing cost of the plug is three times or more that of the conventional plug.
【０００６】このように、プラグの耐用度の向上のため
に、安価な方法で、かつプラグを確実に冷却できる技術
はなかった。現状、ピアサー及びエロンゲータでビレッ
ト穿孔を行う際、新品のプラグからビレット穿孔開始後
数回の穿孔におけるプラグ内に流入する総熱量は、ビレ
ット穿孔後に行われるプラグ外面冷却で奪える総抜熱量
より多い。このため、プラグ平均温度は徐々に上昇し、
やがて流入する熱量と冷却による抜熱量がバランスする
温度に漸近していく。従って、プラグ外面冷却の冷却時
間を大幅に長くしない限り、プラグの漸近する温度を下
げることは不可能で、これがプラグの耐用度を悪化させ
る原因の一つであった。プラグ外面の冷却時間を大幅に
増加することは生産効率の点から不可能であった。ま
た、常にプラグを冷却するために、プラグ内面にマンド
レルバーを通じて、冷却水等の冷却媒体を送り込むプラ
グ内面冷却では、穿孔時にビレットに接触するプラグ外
面と、冷却液が接触するプラグ内面との間で温度勾配が
ついてしまい、プラグ外面温度を下げることは難しく内
面を冷却した効果が十分に発揮されていなかった。本発
明の目的は、上記の問題点に鑑み、プラグの耐用度向上
のため、安価でかつ確実にプラグ外表面を冷却できる穿
孔プラグを提供することにある。As described above, there has been no technique capable of reliably cooling the plug by an inexpensive method for improving the durability of the plug. At present, when performing piercing with a piercer and an elongator, the total amount of heat flowing into the plug from a new plug several times after the start of piercing the billet is larger than the total amount of heat removed from the outer surface cooling of the plug performed after the piercing of the billet. Therefore, the average plug temperature gradually rises,
Eventually, the temperature gradually approaches the temperature at which the amount of heat flowing in and the amount of heat removed by cooling are balanced. Therefore, unless the cooling time for cooling the outer surface of the plug is significantly lengthened, it is impossible to lower the asymptotic temperature of the plug, which is one of the causes of deteriorating the durability of the plug. It has been impossible to significantly increase the cooling time of the outer surface of the plug in terms of production efficiency. In addition, in order to cool the plug at all times, a cooling medium such as cooling water is sent to the inner surface of the plug through a mandrel bar to cool the inner surface of the plug.In cooling the inner surface of the plug, the space between the outer surface of the plug that contacts the billet during drilling and the inner surface of the plug that contacts the cooling liquid. Therefore, it was difficult to lower the temperature of the outer surface of the plug, and the effect of cooling the inner surface was not fully exerted. In view of the above problems, an object of the present invention is to provide a perforated plug that is inexpensive and can reliably cool the outer surface of the plug in order to improve the durability of the plug.
【０００７】[0007]
【課題を解決するための手段】前記課題を解決し目的を
達成するために、本発明は以下に示す手段を用いてい
る。
（１）本発明のプラグは、プラグ基礎部とプラグ穿孔
部、及びマンドレルバーからなり、プラグ基礎部はプラ
グ穿孔部を補強する補強材を有し、そのプラグ基礎部と
プラグ穿孔部の間にマンドレルバーを通じて冷却液を供
給及び排出する手段を備えたことを特徴とする、穿孔プ
ラグである。In order to solve the above problems and achieve the object, the present invention uses the following means. (1) The plug of the present invention comprises a plug base, a plug hole, and a mandrel bar, and the plug base is made of plastic.
A plug having a reinforcing material for reinforcing a hole for drilling, and a means for supplying and discharging a cooling liquid through a mandrel bar between the plug base and the hole for plugging.
【０００８】（２） プラグ基礎部とプラグ穿孔部、及
びマンドレルバーからなり、プラグ基礎部はプラグ穿孔
部を補強する補強材を有し、プラグ基礎部とプラグ穿孔
部の間にマンドレルバーを通じてプラグ穿孔部の先端に
冷却液を供給及び排出する手段を備えたことを特徴とす
る、穿孔プラグである。
（３） プラグ基礎部とプラグ穿孔部、及びマンドレル
バーからなり、プラグ基礎部はプラグ穿孔部を補強する
補強材を有し、プラグ基礎部とプラグ穿孔部の間にマン
ドレルバーを通じてプラグ穿孔部の先端に冷却液を供給
及び排出する手段を備え、この冷却液の供給・排出手段
は、プラグ基礎部とプラグ穿孔部とにより、プラグ穿孔
部の内面を沿うように形成されてなることを特徴とす
る、穿孔プラグ。
（４）前記プラグ穿孔部について、そのプラグ外表面最
高到達温度が８００℃以下で使用されることを特徴とす
る（１）乃至（３）に記載の穿孔プラグ。
（５）前記プラグ穿孔部について、穿孔時間：Ｔｓに応
じてプラグ外表面最高到達温度を８００℃以下にするべ
く、下記（１）式に基づいて、プラグ穿孔部の肉厚：ｔ
ｈを設定することを特徴とした、（１）乃至（４）のい
ずれかに記載の穿孔プラグ。
ｔｈ＝１４７（Ｔｓ）-0.776 …（１）
但し、ｔｈ：プラグ穿孔部の肉厚（ｍｍ）、Ｔｓ：穿孔
時間（秒）。(2) A plug base portion, a plug perforation portion, and a mandrel bar, wherein the plug base portion has a reinforcing material for reinforcing the plug perforation portion, and the mandrel bar is provided between the plug base portion and the plug perforation portion. A perforated plug, characterized in that a means for supplying and discharging a cooling liquid is provided at the tip of the perforated portion. (3) It consists of a plug foundation , a plug bore, and a mandrel bar. The plug foundation reinforces the plug bore.
A means for supplying and discharging the cooling liquid is provided at the tip of the plug drilling portion through a mandrel bar between the plug foundation and the plug drilling portion. A perforated plug formed by the plug perforation portion along an inner surface of the plug perforation portion. (4) The perforated plug according to any one of (1) to (3), wherein the plug outermost surface is used at a maximum temperature reached on the outer surface of the plug of 800 ° C. or less. (5) Regarding the plug piercing portion, the wall thickness of the plug piercing portion: t is set based on the following equation (1) so that the maximum temperature reached on the outer surface of the plug is 800 ° C. or less according to the piercing time: Ts.
h is set, The perforated plug in any one of (1) thru | or (4) characterized by the above-mentioned. th = 147 (Ts) -0.776 (1) where th: thickness of plug perforated portion (mm), Ts: perforation time (second).
【０００９】[0009]
【発明の実施の形態】本発明者らは、上記の課題を解決
すべく鋭意研究を重ねた結果、以下に示す知見を得るに
至った。図１〜４に一般的なピアサー（例えばマンネス
マン型）での穿孔工程の概要を示す。図１の状態が穿孔
工程である。図１に示すように特殊な形状の鋳鋼ロール
１４を２つの平行な垂直面上におき、水平に対して約５
°〜１５°だけ互いに逆方向に傾いていて、ロール１４
は同一方向に回転する。この２本のロール１４の間に加
熱されたビレット１５を挿入するときはビレット１５は
まず外径が小さくなり、螺旋運動によって表面が斜め前
方に引張られる。そこに砲弾型のプラグ１をマンドレル
バー８を介して前方から押し付けるとビレット１５の穿
孔が行われ、ホローシェル１６（中空素管）が得られ
る。BEST MODE FOR CARRYING OUT THE INVENTION As a result of intensive studies to solve the above problems, the present inventors have obtained the following findings. 1 to 4 show the outline of a perforation process using a general piercer (for example, Mannesmann type). The state of FIG. 1 is a punching process. As shown in FIG. 1, a cast steel roll 14 having a special shape is placed on two parallel vertical planes, and the horizontal direction is about 5 degrees.
The rolls 14 are tilted in the opposite directions by 15 ° to 15 °.
Rotate in the same direction. When the heated billet 15 is inserted between the two rolls 14, the billet 15 first has a smaller outer diameter, and the surface thereof is pulled obliquely forward by the spiral motion. When the shell-shaped plug 1 is pressed from there through the mandrel bar 8 from the front, the billet 15 is perforated, and the hollow shell 16 (hollow shell) is obtained.
【００１０】図２の状態が引き抜き工程である。穿孔し
て得られたホローシェル（中空素管）１６からプラグ１
をマンドレルバー８を介して引き抜く。図３の状態が冷
却工程である。前述した穿孔工程（図１）と引き抜き工
程（図２）においてビレット１５やホローシェル１６と
の接触及び摩擦熱によって熱を受け高温となったプラグ
１が外面水冷装置１３中に入るように、マンドレルバー
８を介して移動し、プラグ１外表面を外面水冷装置１３
で冷却する。図４の状態が待機工程である。２本のロー
ル１４間にビレット１５を挿入した状態で、プラグ１外
表面の冷却終了後、外面水冷装置１３内からマンドレル
バー８を介してプラグ１を押出して、プラグ１を穿孔前
にロール１４入口付近で待機させる。図１〜４の工程で
一本のビレット１５を穿孔する（ビレット１５を一本穿
孔する毎に１パスという）。図５にプラグを交換して１
パス目から３パス目までのプラグ外表面温度とプラグ内
部温度の温度履歴を示す。穿孔が始まると、プラグ外表
面温度は穿孔終了まで急激に温度上昇し、穿孔終了後、
ホローシェルとなったビレットからプラグが引き抜か
れ、続いて冷却されて外表面温度は降下する。一方、プ
ラグ内部温度は、穿孔毎に緩やかに上下しながら温度上
昇していく。The state shown in FIG. 2 is a drawing process. Plug 1 from hollow shell (hollow shell) 16 obtained by drilling
Is pulled out through the mandrel bar 8. The state of FIG. 3 is a cooling process. The mandrel bar is arranged so that the plug 1 which has been heated to a high temperature by the contact with the billet 15 and the hollow shell 16 and the frictional heat in the punching step (FIG. 1) and the drawing step (FIG. 2) described above enters the outer surface water cooling device 13. 8 to move the outer surface of the plug 1 to the outer surface water cooling device 13
Cool with. The state of FIG. 4 is a standby process. After cooling the outer surface of the plug 1 with the billet 15 inserted between the two rolls 14, the plug 1 is extruded from inside the outer surface water cooling device 13 via the mandrel bar 8 to roll the plug 1 before piercing the roll 14. Wait near the entrance. One billet 15 is punched in the steps of FIGS. 1 to 4 (each pass is called one pass). Replace the plug in Fig. 1
The temperature history of the plug outer surface temperature and the plug inner temperature from the third pass to the third pass is shown. When piercing starts, the temperature of the outer surface of the plug rises rapidly until the end of piercing.
The plug is pulled out from the billet that has become a hollow shell, and then it is cooled and the outer surface temperature drops. On the other hand, the temperature inside the plug gradually rises and rises with each drilling.
【００１１】図６は１パス目から２０パス目までの連続
穿孔した時のプラグの温度履歴で、この場合１０パスを
超えた段階でプラグの内部温度はある一定温度に漸近
し、約４５０℃に至る。また、プラグの外表面の最高温
度も内部温度がある温度に漸近するに従って各パス間で
漸近する。図６の場合はプラグ外表面の最高温度が約８
００℃で漸近しており、１０パス目から２０パス目まで
の最高温度はほとんど８００℃で、この漸近温度を最高
到達温度とする。プラグ内部の漸近温度とプラグ外表面
の最高到達温度は、１パスの中でのプラグ外面からの入
熱と、その後の冷却と放熱による抜熱量で決定される。
近年、能率を重視する操業パターンでは穿孔後の冷却時
間を長くとれず、とくに高合金鋼鋼管製造時において
は、穿孔時間がかかり、穿孔時の摩擦熱等が大きいこと
から最高到達温度が高くプラグの耐用度が悪化してい
た。FIG. 6 shows the temperature history of the plug when continuously drilling from the 1st pass to the 20th pass. In this case, the internal temperature of the plug asymptotically approaches a certain temperature when the number of passes exceeds 10 and is about 450 ° C. Leading to. In addition, the maximum temperature of the outer surface of the plug also approaches each pass as the internal temperature approaches a certain temperature. In the case of Fig. 6, the maximum temperature on the outer surface of the plug is about 8
It is asymptotic at 00 ° C., and the maximum temperature from the 10th pass to the 20th pass is almost 800 ° C., and this asymptotic temperature is taken as the maximum reached temperature. The asymptotic temperature inside the plug and the maximum reached temperature on the outer surface of the plug are determined by the heat input from the outer surface of the plug in one pass and the amount of heat removed by subsequent cooling and heat radiation.
In recent years, in the operation pattern that emphasizes efficiency, it is not possible to take a long cooling time after drilling, especially when manufacturing high-alloy steel pipes, it takes a long time to drill and frictional heat during drilling is large, so the maximum temperature reached is high. The service life of was deteriorated.
【００１２】そこで、本発明者らは、プラグ耐用度を支
配する因子について詳細に研究を重ねた結果、次のこと
が明らかになった。前述した図３の冷却工程においてプ
ラグ１外面をいくら強冷却しても、プラグ１外表面の最
高到達温度と、内部の漸近温度はほとんど下がらない。
また、プラグ１外表面温度が８００℃を超えるとプラグ
１の摩耗が著しく熱間強度が低下し、穿孔中でもあるの
でプラグ１にえぐれや変形を生じることを見出した。Therefore, the present inventors have made detailed studies on the factors that govern the plug durability, and as a result, have revealed the following. Even if the outer surface of the plug 1 is strongly cooled in the cooling step of FIG.
Further, it has been found that when the outer surface temperature of the plug 1 exceeds 800 ° C., the plug 1 is significantly worn and the hot strength is lowered, and the plug 1 is engraved and deformed even during the perforation.
【００１３】そこで次にこのプラグ１の外表面の最高到
達温度を下げる方法について考える。この最高到達温度
を８００℃以下にするためには、（１）穿孔時間の短
縮、（２）穿孔後の水冷時間の延長が考えられるが、通
常の操業条件下では穿孔時間の短縮は不可能で、また、
穿孔後の水冷時間を延長することも能率を悪化させるた
めに実施できなかった。一方、プラグ内面を常時冷却す
る方法でも、プラグ内面の温度を下げるには効果的であ
るが、穿孔中のプラグ外表面を８００℃以下にする事は
できなかった。図７は、常時内面冷却を行いながら、穿
孔工程１３秒、引き抜き工程５秒、冷却工程７秒、待機
工程５秒で連続穿孔をさせた場合の、プラグ外表面とプ
ラグ内面（冷却面）の間の肉厚とプラグ外表面の最高到
達温度の関係を示した図である。 図７に示すように、
プラグ穿孔部の肉厚が２０ｍｍより厚いと最高到達温度
が８００℃を超えている。プラグ穿孔部の肉厚が２０ｍ
ｍを超えているプラグの外表面の最高到達温度は穿孔後
のプラグ外面水冷をいくら強冷却にしても、また、内面
冷却促進のためにプラグ内面に凹凸を設けて伝熱面積を
１．５倍程度増やしても、最高到達温度は８００℃を下
回らなかった。これは、プラグ表面の温度はプラグ外面
表層近傍の熱伝導が支配的であるために、プラグ内面を
いくら強冷却しても外表面には大きな影響を与えないた
めと考えられる。従って、プラグ穿孔部の肉厚を薄くす
ることによって、プラグ外表面とプラグ内面の間の温度
勾配を小さくすると、プラグ外表面の最高到達温度を下
げることが可能であることを見出した。以上の知見に基
づき、本発明者らは、プラグ基礎部とプラグ穿孔部の間
にマンドレルバーを通じて冷却液を供給及び排出する手
段を備え、かつプラグ外表面最高温度が熱間強度が低下
する８００℃を超えないように、穿孔時間に応じてプラ
グ穿孔部の肉厚を設定するようにして、プラグの耐用度
向上のため、安価でかつ確実にプラグ外表面を冷却でき
る穿孔プラグを見出し、本発明を完成させた。Therefore, a method of lowering the maximum temperature reached on the outer surface of the plug 1 will be considered next. In order to reduce the maximum temperature to 800 ° C or less, (1) shortening of the drilling time and (2) extension of the water cooling time after drilling can be considered, but it is impossible to shorten the drilling time under normal operating conditions. And again
Prolonging the water cooling time after perforation could not be performed because it deteriorates the efficiency. On the other hand, the method of constantly cooling the inner surface of the plug is also effective in lowering the temperature of the inner surface of the plug, but the outer surface of the plug during drilling could not be kept at 800 ° C or lower. FIG. 7 shows the outer surface of the plug and the inner surface (cooling surface) of the plug when continuous perforation is performed in the perforation step 13 seconds, the withdrawal step 5 seconds, the cooling step 7 seconds, and the standby step 5 seconds while always cooling the inner surface. It is the figure which showed the relationship between the wall thickness and the highest temperature reached on the outer surface of the plug. As shown in FIG.
When the wall thickness of the plug punched portion is thicker than 20 mm, the maximum temperature reached exceeds 800 ° C. The wall thickness of the plug hole is 20m
The maximum temperature reached on the outer surface of the plug exceeding m is no matter how strong the water cooling of the outer surface of the plug after drilling is, no matter how strong the cooling is, the unevenness is provided on the inner surface of the plug to accelerate the cooling of the inner surface, and the heat transfer area is 1.5. Even if it was increased about twice, the maximum temperature reached did not fall below 800 ° C. This is considered to be because the temperature of the plug surface is dominated by heat conduction in the vicinity of the outer surface layer of the plug, so that no matter how strongly the inner surface of the plug is strongly cooled, the outer surface is not significantly affected. Therefore, it was found that the maximum temperature reached on the outer surface of the plug can be lowered by reducing the temperature gradient between the outer surface of the plug and the inner surface of the plug by reducing the wall thickness of the plug perforated portion. Based on the above findings, the inventors of the present invention have a means for supplying and discharging a cooling liquid through a mandrel bar between the plug base portion and the plug perforation portion, and the maximum temperature on the outer surface of the plug decreases the hot strength 800 In order to improve the durability of the plug by setting the wall thickness of the plug perforation part so that the temperature does not exceed ℃ Completed the invention.
【００１４】以下に本発明の実施の形態について説明す
る。本発明の穿孔プラグは、例えば図９に示すように、
プラグ基礎部３とプラグ穿孔部２、及びマンドレルバー
８からなり、そのプラグ基礎部３とプラグ穿孔部２の間
にマンドレルバー８を通じて冷却液９を供給及び排出す
る手段（循環ポンプ等）を備えたことを特徴とする。即
ち、プラグ１内面冷却の際は、二重管のマンドレルバー
８の一方の管（マンドレルバー内管５）から冷却液９が
送り込まれ、プラグ基礎部３中央を通じて、プラグ穿孔
部２とプラグ基礎部３の間に送り込まれ、かつ、冷却後
の冷却液９は、再びマンドレルバー８のもう一方の管
（マンドレルバー外管４）を通じて送り返される。この
ため、冷却水９が穿孔中のビレットに流出する事はな
い。Embodiments of the present invention will be described below. The piercing plug of the present invention is, for example, as shown in FIG.
The plug base portion 3 and the plug perforation portion 2 and the mandrel bar 8 are provided, and a means (circulation pump or the like) for supplying and discharging the cooling liquid 9 through the mandrel bar 8 is provided between the plug base portion 3 and the plug perforation portion 2. It is characterized by that. That is, at the time of cooling the inner surface of the plug 1, the cooling liquid 9 is fed from one pipe of the double-pipe mandrel bar 8 (the mandrel bar inner pipe 5), and the plug piercing portion 2 and the plug foundation 2 are passed through the center of the plug foundation portion 3. The cooling liquid 9 which has been sent between the parts 3 and which has been cooled is again sent back through the other pipe (mandrel bar outer pipe 4) of the mandrel bar 8. Therefore, the cooling water 9 does not flow out into the billet being punched.
【００１５】上記したように、マンドレルバー８を通じ
て冷却液９を供給及び排出する手段を備える理由は、プ
ラグ穿孔中のビレットへの冷却水の漏洩と、ビレット穿
孔後のホローシェル内面の過冷却を防止するためであ
る。As described above, the reason for providing the means for supplying and discharging the cooling liquid 9 through the mandrel bar 8 is to prevent the leakage of the cooling water to the billet during the drilling of the plug and the overcooling of the inner surface of the hollow shell after the drilling of the billet. This is because
【００１６】更に、本発明では着脱を容易とするため、
及びプラグ軽量化のためにプラグの穿孔部２とプラグの
基礎部３に分けた。プラグ穿孔部２とプラグ基礎部３を
脱着する方法としては、ビレット穿孔時の回転によって
はずれない方向でねじ込みにより取り付ける方法を用い
たが、脱着方法としてはこの限りでない。Further, in the present invention, in order to facilitate the attachment / detachment,
The plug is divided into a plug piercing portion 2 and a plug base portion 3 in order to reduce the weight of the plug. As a method for attaching / detaching the plug piercing portion 2 and the plug base portion 3, a method of attaching by screwing in a direction in which the plug piercing portion 2 and the plug base portion 3 are not displaced by the rotation at the time of piercing the billet was used, but the attaching / detaching method is not limited to this.
【００１７】なお、図１０に示すように、プラグ穿孔部
２に強度を持たせるために、プラグ基礎部３のプラグ形
状にそった、補強材６を入れることが望ましい。また、
前記プラグ穿孔部２は、その例えばビレットと接触する
部分のプラグ外表面最高温度が常に８００℃以下で使用
される。プラグ外表面最高温度が８００℃を超えると、
前述したようにプラグ１の摩耗が著しく熱間強度が低下
し、穿孔中でもあるのでプラグ１にえぐれや変形を生じ
るからである。Incidentally, as shown in FIG. 10, in order to give strength to the plug perforation portion 2, it is desirable to insert a reinforcing material 6 in conformity with the plug shape of the plug base portion 3. Also,
The plug perforation portion 2 is used, for example, at a maximum plug outer surface temperature of 800 ° C. or less at a portion in contact with the billet. If the maximum temperature on the outer surface of the plug exceeds 800 ° C,
This is because, as described above, the plug 1 is significantly worn out and the hot strength is lowered, and the plug 1 is engraved and deformed even during the perforation.
【００１８】さらに、前記プラグ穿孔部２について、穿
孔時間：Ｔｓに応じてプラグ外表面最高温度を８００℃
以下にするべく、プラグ穿孔部２の肉厚：ｔｈを設定す
る。
ｔｈ＝１４７（Ｔｓ）-0.776 …（１）
但し、ｔｈ：プラグ穿孔部の肉厚（ｍｍ）、Ｔｓ：穿孔
時間（秒）。Further, regarding the plug piercing portion 2, the maximum temperature of the outer surface of the plug is 800 ° C. according to the piercing time: Ts.
The thickness: th of the plug punching portion 2 is set so as to be as follows. th = 147 (Ts) -0.776 (1) where th: thickness of plug perforated portion (mm), Ts: perforation time (second).
【００１９】これは、以下に示す本発明者らの実験より
明らかとなった。即ち、本発明者らは、穿孔時間（Ｔ
ｓ）を変えてもプラグ外表面が８００℃を超えないよう
にするためのプラグ肉厚（ｔｈ）を求めた結果（図８参
照）、穿孔時間とプラグ穿孔部の肉厚の関係は上記した
（１）式で表される。This has been clarified by the following experiments conducted by the present inventors. That is, the inventors have found that the perforation time (T
As a result of obtaining the plug wall thickness (th) so that the outer surface of the plug does not exceed 800 ° C even when s) is changed (see Fig. 8), the relationship between the drilling time and the wall thickness of the plug drilling portion is as described above. It is expressed by equation (1).
【００２０】この式によって、別の穿孔条件でもプラグ
の肉厚を設定することができる。尚、プラグ穿孔時には
プラグ表面近傍に大きな力が加わるので、相応の強度を
持つ必要があり、そのためプラグ肉厚はあまり薄くする
ことはできない。通常、薄くても１０ｍｍ以上必要であ
る。以下に本発明の実施例を挙げ、本発明の効果を立証
する。According to this formula, the wall thickness of the plug can be set under other drilling conditions. In addition, since a large force is applied to the vicinity of the surface of the plug when the plug is punched, it is necessary to have appropriate strength. Therefore, the plug wall thickness cannot be made too thin. Usually, the thickness is 10 mm or more even if it is thin. Examples of the present invention will be given below to prove the effects of the present invention.
【００２１】[0021]
【実施例】（実施例１）図９に本発明の実施例１を示
す。高合金鋼の１３Ｃｒ鋼ビレットをピアサーと穿孔プ
ラグにより穿孔しホローシェルを製造した。穿孔するに
あたり図９に示す最大径１４０ｍｍの穿孔プラグ一式を
使用し、プラグ基礎部３と肉厚２０ｍｍのプラグ穿孔部
２の間に冷却液９として冷却水を二重管になっているマ
ンドレルバー８の中央の管（内管）５から約１００ｌ／
分送水してプラグ穿孔部２の冷却を行い、冷却後の冷却
水はマンドレルバー８の外側の管４を通じて排水した。
尚、プラグ穿孔部２には熱間工具鋼用のＪＩＳ規格ＳＫ
Ｔ４を使用し、プラグ基礎部３には一般構造用のＪＩＳ
規格のＳ４５Ｃを用いた。EXAMPLE 1 Example 1 of the present invention is shown in FIG. A high alloy steel 13Cr steel billet was perforated with a piercer and a perforation plug to manufacture a hollow shell. For drilling, a set of drilling plugs with a maximum diameter of 140 mm shown in FIG. 9 is used, and a cooling water as a cooling liquid 9 is a double pipe mandrel bar between the plug base portion 3 and the plug drilling portion 2 having a wall thickness of 20 mm. 8 central pipe (inner pipe) 5 to about 100 l /
Water was distributed to cool the plug hole portion 2, and the cooling water after cooling was discharged through the pipe 4 outside the mandrel bar 8.
It should be noted that the plug hole 2 has JIS standard SK for hot work tool steel.
T4 is used, and the plug base 3 is JIS for general structure.
Standard S45C was used.
【００２２】穿孔条件は以下の通りであった。
（１）ビレットは１３Ｃｒ鋼からなり、全長約２．５ｍ
であった。
（２）ビレットは加熱炉で約１２７０℃まで加熱した。The perforation conditions were as follows. (1) The billet is made of 13Cr steel and the total length is about 2.5m.
Met. (2) The billet was heated to about 1270 ° C in a heating furnace.
【００２３】（３）１パス当たりの全工程は約３０秒
で、各工程の時間は穿孔工程が約１２秒、ビレットから
の引き抜き工程が約５秒、プラグ外面冷却工程が約７
秒、ビレット前での待機工程が約６秒であった。
（４）前記（１）式から肉厚を求めると２１．３ｍｍと
なったので、プラグの肉厚は２０．０ｍｍとした。
以上の条件で実施した結果、本発明プラグを用いると平
均３１．３パスまで連続穿孔が可能であった。穿孔直後
のプラグ外表面温度を放射温度計によって測温してみた
結果、約７７０℃でプラグ温度を８００℃以下に保て
た。プラグの耐用度が無くなったときは、まだ連続穿孔
が可能であったが、プラグの一部の潤滑性が無くなった
ためである。プラグの摩耗、劣化によるものと考えられ
る。
（実施例２）実施例１と同じく１３Ｃｒ鋼ビレットをピ
アサーと穿孔プラグにより穿孔しホローシェルを製造し
た。穿孔するに当たり図１０に示す最大径１４０ｍｍの
穿孔プラグ一式を使用し、プラグ穿孔部２の肉厚は１８
ｍｍで、プラグ基礎部３にプラグ穿孔部２の補強材６を
プラグ１長手方向に等間隔で放射状に８枚敷いた。プラ
グ基礎部３とプラグ穿孔部２の間に冷却液９として冷却
水を二重管になっているマンドレルバー８の中央の管５
から約１００ｌ／分送水してプラグ穿孔部２の冷却を行
い、冷却後の冷却水はマンドレルバー８の外側の管４を
通じて排水した。尚、プラグ穿孔部２には熱間工具鋼用
のＪＩＳ規格ＳＫＴ４を使用し、プラグ基礎部３には一
般構造用のＪＩＳ規格のＳ４５Ｃを用いた。(3) The total process for one pass is about 30 seconds, and the time for each process is about 12 seconds for the punching step, about 5 seconds for the step of withdrawing from the billet, and about 7 seconds for the step of cooling the outer surface of the plug.
Second, the waiting process before the billet was about 6 seconds. (4) The wall thickness of the plug was set to 20.0 mm because the wall thickness was calculated to be 21.3 mm from the equation (1). As a result of carrying out under the above conditions, continuous drilling was possible up to an average of 31.3 passes using the plug of the present invention. The temperature of the outer surface of the plug immediately after drilling was measured with a radiation thermometer. As a result, the plug temperature was kept at 800 ° C or lower at about 770 ° C. When the service life of the plug was exhausted, continuous drilling was still possible, but the lubricity of part of the plug was lost. This is probably due to wear and deterioration of the plug. (Example 2) As in Example 1, a 13Cr steel billet was perforated with a piercer and a perforation plug to manufacture a hollow shell. When piercing, a set of piercing plugs having a maximum diameter of 140 mm shown in FIG. 10 is used, and the thickness of the plug piercing portion 2 is 18
8 mm of the reinforcing material 6 of the plug piercing portion 2 are laid radially in the plug base portion 3 at equal intervals in the longitudinal direction of the plug 1. A central pipe 5 of the mandrel bar 8 having a double pipe of cooling water as a cooling liquid 9 between the plug base portion 3 and the plug drilling portion 2.
About 100 l / min to cool the plug perforation portion 2, and the cooled cooling water was discharged through the pipe 4 outside the mandrel bar 8. In addition, JIS standard SKT4 for hot tool steel was used for the plug piercing part 2, and JIS standard S45C for general structure was used for the plug base part 3.
【００２４】穿孔条件は以下の通りであった。
（１）ビレットは１３Ｃｒ鋼からなり、全長約２．５ｍ
であった。
（２）ビレットは加熱炉で約１２７０℃まで加熱した。The perforation conditions were as follows. (1) The billet is made of 13Cr steel and the total length is about 2.5m.
Met. (2) The billet was heated to about 1270 ° C in a heating furnace.
【００２５】（３）１パス当たりの全工程は約３０秒
で、各工程の時間は穿孔工程が約１３秒、ビレットから
の引き抜き工程が約５秒、プラグ外面冷却工程が約７
秒、ビレット前での待機工程が約５秒であった。(3) The total number of steps per pass is about 30 seconds, the time for each step is about 13 seconds for punching, about 5 seconds for drawing from the billet, and about 7 for cooling the outer surface of the plug.
Second, the waiting process before the billet was about 5 seconds.
【００２６】（４）前記（１）式から肉厚を求めると２
０．０ｍｍとなったので、プラグの肉厚は１８．０ｍｍ
とした。以上の条件で実施してみた結果、本発明プラグ
を用いると平均３５．３パスまで連続穿孔が可能であっ
た。穿孔直後のプラグ外表面温度を放射温度計によって
測温してみた結果、約７２０℃でプラグ温度を８００℃
以下に保てた。プラグの耐用度が無くなったときはプラ
グの摩耗、劣化によるものと考えられる。
（実施例３）実施例１と同じく１３Ｃｒ鋼ビレットをピ
アサー穿孔プラグにより穿孔しホローシェルを製造し
た。穿孔するに当たり図１１に示す最大径１４０ｍｍの
穿孔プラグ一式を使用し、プラグ穿孔部２の肉厚は１
５．０ｍｍで、プラグ基礎部３はプラグ穿孔部２の内側
内面とほぼ同じ大きさの砲弾状で作られており、かつ、
プラグ基礎部３の外表面には、深さ１０ｍｍ、幅１０ｍ
ｍの冷却液９が通過する冷却溝が１０本以上設けられて
いる。(4) When the wall thickness is calculated from the equation (1), it is 2
Since the thickness is 0.0 mm, the thickness of the plug is 18.0 mm
And As a result of carrying out under the above-mentioned conditions, continuous drilling was possible up to an average of 35.3 passes using the plug of the present invention. The temperature of the outer surface of the plug immediately after drilling was measured with a radiation thermometer. As a result, the plug temperature was 800 ° C at about 720 ° C.
I kept it below. When the durability of the plug is lost, it is considered that the plug is worn or deteriorated. (Example 3) As in Example 1, a 13Cr steel billet was perforated with a piercer perforation plug to manufacture a hollow shell. When piercing, a set of piercing plugs with a maximum diameter of 140 mm shown in FIG. 11 is used, and the thickness of the plug piercing portion 2 is 1
With a thickness of 5.0 mm, the plug base portion 3 is made of a cannonball-shaped body having substantially the same size as the inner inner surface of the plug perforation portion 2, and
The outer surface of the plug base 3 has a depth of 10 mm and a width of 10 m.
There are 10 or more cooling grooves through which the m cooling liquid 9 passes.
【００２７】冷却液９である冷却水は二重管になってい
るマンドレルバー８の中央の管５から約１００ｌ／分送
水して、プラグ基礎部３の冷却溝を通過しながらプラグ
穿孔部２の冷却を行い、冷却後の冷却水はマンドレルバ
ー８の外側の管４を通じて排水した。尚、プラグ穿孔部
２には熱間工具鋼用のＪＩＳ規格ＳＫＴ４を使用し、プ
ラグ基礎部３には一般構造用のＪＩＳ規格のＳ４５Ｃを
用いた。穿孔条件は以下の通りであった。
（１）ビレットは１３Ｃｒ鋼からなり、全長約２．５ｍ
であった。The cooling water, which is the cooling liquid 9, is fed from the central pipe 5 of the mandrel bar 8 which is a double pipe at a flow rate of about 100 l / min, and passes through the cooling groove of the plug base 3 while the plug perforation 2 is formed. The cooling water after cooling was discharged through the pipe 4 outside the mandrel bar 8. In addition, JIS standard SKT4 for hot tool steel was used for the plug piercing part 2, and JIS standard S45C for general structure was used for the plug base part 3. The perforation conditions were as follows. (1) The billet is made of 13Cr steel and the total length is about 2.5m.
Met.
【００２８】（２）ビレットは加熱炉で約１２７０℃ま
で加熱した。
（３）１パス当たりの全工程は約３０秒で、各工程の時
間は穿孔工程が約１３秒、ビレットからの引き抜き工程
が約５秒、プラグ外面冷却工程が約７秒、ビレット前で
の待機工程が約５秒であった。(2) The billet was heated to about 1270 ° C. in a heating furnace. (3) The total process per pass is about 30 seconds. The time of each process is about 13 seconds for the punching step, about 5 seconds for the drawing step from the billet, about 7 seconds for the plug outer surface cooling step, and before the billet. The waiting step was about 5 seconds.
【００２９】（４）前記（１）式から肉厚を求めると２
０．０ｍｍとなったので、プラグの肉厚は１５．０ｍｍ
とした。以上の条件で実施してみた結果、本発明プラグ
を用いると平均３５．３パスまで連続穿孔が可能であっ
た。穿孔直後のプラグ外表面温度を放射温度計によって
測温してみた結果、約７２０℃でプラグ温度を８００℃
以下に保てた。プラグの耐用度が無くなったときはプラ
グの摩耗、劣化によるものと考えられる。
（比較例１）比較例１は実施例１と同じく高合金鋼の１
３Ｃｒ鋼ビレットからホローシェルをピアサーにより穿
孔した。穿孔するにあたり図９に示す最大径１４０ｍｍ
のプラグ一式を使用し、プラグ基礎部３と肉厚４０ｍｍ
のプラグ穿孔部２の間に冷却液９として冷却水を二重管
になっているマンドレルバー８の中央の管５から約１０
０ｌ／分送水してプラグ穿孔部２の冷却を行い、冷却後
の冷却水はマンドレルバー８の外側の管４を通じて排水
した。穿孔条件は以下の通りであった。
（１）ビレットは１３Ｃｒ鋼からなり、全長約２．５ｍ
ｍであった。(4) When the wall thickness is calculated from the equation (1), it is 2
Since the thickness is 0.0 mm, the plug thickness is 15.0 mm.
And As a result of carrying out under the above-mentioned conditions, continuous drilling was possible up to an average of 35.3 passes using the plug of the present invention. The temperature of the outer surface of the plug immediately after drilling was measured with a radiation thermometer. As a result, the plug temperature was 800 ° C at about 720 ° C.
I kept it below. When the durability of the plug is lost, it is considered that the plug is worn or deteriorated. (Comparative Example 1) Comparative Example 1 is the same as Example 1 except that it is made of high alloy steel 1
A hollow shell was punched from a 3Cr steel billet by a piercer. When drilling, maximum diameter 140 mm shown in Fig. 9
Using a set of plugs, the plug base 3 and wall thickness 40 mm
Between the central pipe 5 of the mandrel bar 8 which is a double pipe of cooling water as the cooling liquid 9 between the plug perforation parts 2 of
The plug perforation portion 2 was cooled by sending 0 l / min of water, and the cooled cooling water was discharged through the pipe 4 outside the mandrel bar 8. The perforation conditions were as follows. (1) The billet is made of 13Cr steel and the total length is about 2.5m.
It was m.
【００３０】（２）ビレットは加熱炉で約１２７０℃ま
で加熱した。
（３）１パス当たりの全工程は約３０秒で、各工程の時
間は穿孔工程が約１２秒、ビレットからの引き抜き工程
が約５秒、プラグ外面冷却工程が約７秒、ビレット前ま
での待機工程が約６秒であった。(2) The billet was heated to about 1270 ° C. in a heating furnace. (3) The total process per pass is about 30 seconds. The time of each process is about 12 seconds for the punching step, about 5 seconds for the step of drawing from the billet, about 7 seconds for the step of cooling the outer surface of the plug, and before the billet. The waiting step was about 6 seconds.
【００３１】（４）前記（１）式から肉厚を求めると２
１．０ｍｍであった。
以上の条件で実施してみた結果、比較例１での肉厚４０
ｍｍのプラグを用いると平均６．８パスしか連続穿孔で
きなかった。また、穿孔直後のプラグ外表面温度を放射
温度計によって測温してみた結果、約８７０℃で、プラ
グ肉厚が厚いために、最高到達温度は８００℃を超えた
ためと考えられる。(4) When the wall thickness is calculated from the equation (1), it is 2
It was 1.0 mm. As a result of carrying out under the above conditions, the wall thickness of Comparative Example 1 is 40
With a mm plug, only 6.8 passes could be continuously drilled on average. Further, as a result of measuring the temperature of the outer surface of the plug immediately after drilling with a radiation thermometer, it is considered that the maximum attainable temperature exceeded 800 ° C because it was about 870 ° C and the thickness of the plug was thick.
【００３２】[0032]
【発明の効果】以上、説明したように、本発明によれ
ば、プラグ穿孔部の肉厚と内部冷却手段を特定すること
により、特に高合金鋼継目無管製造に有用な効果がもた
らされる。As described above, according to the present invention, by specifying the wall thickness of the plug perforation portion and the internal cooling means, particularly useful effects can be brought about in the production of the high alloy steel seamless pipe.
【００３３】（１）穿孔時間に応じてプラグ穿孔部の肉
厚を設定することによりプラグ外表面の最高到達温度を
８００℃以下に保つことができ、大幅な耐用度の向上に
つながる。(1) By setting the wall thickness of the plug perforation portion according to the perforation time, the maximum temperature reached on the outer surface of the plug can be maintained at 800 ° C. or less, which leads to a great improvement in durability.
【００３４】（２）プラグの耐用度向上により、生産性
の向上、経費の削減につながる。
（３）プラグ内の冷却水はマンドレルバーを通じて送水
排水を行うため、プラグ穿孔中のビレットへの冷却水が
漏洩することなく、ビレット穿孔後のホローシェル内面
が過冷却されることがない。
（４）プラグをプラグ穿孔部とプラグ基礎部に分けるこ
とによって、プラグの着脱が容易となり、かつ、プラグ
の交換する部分の重量が緩和され交換にかかる労力が軽
減される。
（５）現設備の大幅な変更をせずに本技術を導入するこ
とができ、コストパフォーマンスが良い。(2) The improved durability of the plug leads to improved productivity and cost reduction. (3) Since the cooling water in the plug is sent and drained through the mandrel bar, the cooling water does not leak to the billet during the drilling of the plug, and the inner surface of the hollow shell after drilling the billet is not overcooled. (4) By dividing the plug into the plug piercing portion and the plug base portion, the attachment and detachment of the plug is facilitated, and the weight of the portion where the plug is replaced is reduced, and the labor for replacement is reduced. (5) The present technology can be introduced without making major changes to existing equipment, and cost performance is good.
【図１】ピアサーでの穿孔工程を示す概略図。FIG. 1 is a schematic view showing a drilling process with a piercer.
【図２】ピアサーでの引き抜き工程を示す概略図。FIG. 2 is a schematic diagram showing a drawing process with a piercer.
【図３】ピアサーでの冷却工程を示す概略図。FIG. 3 is a schematic diagram showing a cooling process with a piercer.
【図４】ピアサーでの待機工程を示す概略図。FIG. 4 is a schematic diagram showing a waiting process in a piercer.
【図５】プラグの１〜３パス目までの温度履歴を説明す
るグラフ図。FIG. 5 is a graph illustrating the temperature history of plugs 1 to 3rd pass.
【図６】プラグの１〜２０パス目までの温度履歴を説明
するグラフ図。FIG. 6 is a graph illustrating a temperature history of plugs 1 to 20.
【図７】プラグ穿孔部の肉厚と到達温度の関係を説明す
るグラフ図。FIG. 7 is a graph illustrating the relationship between the wall thickness of the plug hole and the ultimate temperature.
【図８】穿孔時間とプラグの理想的肉厚を説明するグラ
フ図。FIG. 8 is a graph illustrating the punching time and the ideal wall thickness of the plug.
【図９】本発明の実施例１に係るプラグの断面図。FIG. 9 is a sectional view of the plug according to the first embodiment of the present invention.
【図１０】本発明の実施例２に係るプラグの断面図。FIG. 10 is a sectional view of a plug according to a second embodiment of the present invention.
【図１１】本発明の実施例３に係るプラグの断面図。FIG. 11 is a sectional view of a plug according to a third embodiment of the present invention.
１…プラグ、２…プラグ穿孔部、３…プラグ基礎部、４
…マンドレルバー外管、５…マンドレルバー内管、６…
補強板、７…プラグ肉厚、８…マンドレルバー、９…冷
却液の流れ方向、１３…外面水冷装置、１４…ロール、
１５…ビレット（丸鋼片）、１６…ホローシェル（中空
素管）。1 ... Plug, 2 ... Plug piercing part, 3 ... Plug base part, 4
… Mandrel bar outer tube, 5… Mandrel bar inner tube, 6…
Reinforcement plate, 7 ... Plug wall thickness, 8 ... Mandrel bar, 9 ... Coolant flow direction, 13 ... External water cooling device, 14 ... Roll,
15 ... Billet (round steel slab), 16 ... Hollow shell (hollow shell).
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤林 晃夫 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (72)発明者 富田 省吾 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (56)参考文献 特開 平10−118703（ＪＰ，Ａ) 実開 昭53−43023（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B21B 25/00 - 25/04 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akio Fujibayashi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Inventor Shogo Tomita 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe Within the corporation (56) Reference JP-A-10-118703 (JP, A) Actual development Sho-53-43023 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) B21B 25/00 -25/04
Claims (5)
ドレルバーからなり、プラグ基礎部はプラグ穿孔部を補
強する補強材を有し、プラグ基礎部とプラグ穿孔部の間
にマンドレルバーを通じて冷却液を供給及び排出する手
段を備えたことを特徴とする、穿孔プラグ。1. A plug base portion, a plug perforation portion, and a mandrel bar, wherein the plug base portion has a reinforcing material for reinforcing the plug perforation portion, and a cooling liquid is passed through the mandrel bar between the plug base portion and the plug perforation portion. A perforated plug, characterized in that it is provided with means for supplying and discharging.
ドレルバーからなり、プラグ基礎部はプラグ穿孔部を補
強する補強材を有し、プラグ基礎部とプラグ穿孔部の間
にマンドレルバーを通じてプラグ穿孔部の先端に冷却液
を供給及び排出する手段を備えたことを特徴とする、穿
孔プラグ。2. A plug base portion, a plug perforation portion, and a mandrel bar, wherein the plug base portion has a reinforcing material for reinforcing the plug perforation portion, and the plug perforation is performed through the mandrel bar between the plug base portion and the plug perforation portion. A perforated plug, characterized in that it comprises means for supplying and discharging a cooling liquid at the tip of the portion.
ドレルバーからなり、プラグ基礎部はプラグ穿孔部を補
強する補強材を有し、プラグ基礎部とプラグ穿孔部の間
にマンドレルバーを通じてプラグ穿孔部の先端に冷却液
を供給及び排出する手段を備え、この冷却液の供給・排
出手段は、プラグ基礎部とプラグ穿孔部とにより、プラ
グ穿孔部の内面を沿うように形成されてなることを特徴
とする、穿孔プラグ。3. A plug foundation portion, a plug perforation portion, and a mandrel bar, wherein the plug foundation portion complements the plug perforation portion.
A means for supplying and discharging the cooling liquid is provided at the tip of the plug piercing portion through a mandrel bar between the plug foundation and the plug piercing portion. A piercing plug, characterized in that it is formed by the portion and the plug piercing portion along the inner surface of the plug piercing portion.
表面最高到達温度が８００℃以下で使用されることを特
徴とした、請求項１〜３のいずれかに記載の穿孔プラ
グ。About wherein said plug perforation was characterized by its plug outer surface maximum temperature is used at 800 ° C. or less, drilling plug according to claim 1.
ｓに応じてプラグ外表面最高到達温度を８００℃以下に
するべく、下記（１）式に基づいて、プラグ穿孔部の肉
厚：ｔｈを設定することを特徴とした、請求項１〜４の
いずれかに記載の穿孔プラグ。 ｔｈ＝１４７（Ｔｓ）-0.776 …（１） 但し、ｔｈ：プラグ穿孔部の肉厚（ｍｍ）、Ｔｓ：穿孔
時間（秒）。5. A perforation time: T for the plug perforation part.
The maximum thickness of the outer surface of the plug to be 800 ° C. or less according to s, the thickness of the plug perforated part: th is set based on the following formula (1) .
A perforated plug according to any of the above. th = 147 (Ts) -0.776 (1) where th: thickness of plug perforated portion (mm), Ts: perforation time (second).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17485098A JP3458712B2 (en) | 1998-06-22 | 1998-06-22 | Perforated plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17485098A JP3458712B2 (en) | 1998-06-22 | 1998-06-22 | Perforated plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000005805A JP2000005805A (en) | 2000-01-11 |
| JP3458712B2 true JP3458712B2 (en) | 2003-10-20 |
Family
ID=15985752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17485098A Expired - Fee Related JP3458712B2 (en) | 1998-06-22 | 1998-06-22 | Perforated plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3458712B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862397A (en) * | 2017-04-19 | 2017-06-20 | 苏州汇程精密模具有限公司 | A kind of hot stamping die cooling drift |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102233355A (en) * | 2010-04-28 | 2011-11-09 | 洛阳璋泰非标机械有限公司 | Technological process for adding retained mandrel to reducing rolling section of hot-rolled small-diameter seamless steel tube |
-
1998
- 1998-06-22 JP JP17485098A patent/JP3458712B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862397A (en) * | 2017-04-19 | 2017-06-20 | 苏州汇程精密模具有限公司 | A kind of hot stamping die cooling drift |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000005805A (en) | 2000-01-11 |
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