JPS59133929A - Rolling method of long columnar body - Google Patents

Rolling method of long columnar body

Info

Publication number
JPS59133929A
JPS59133929A JP580883A JP580883A JPS59133929A JP S59133929 A JPS59133929 A JP S59133929A JP 580883 A JP580883 A JP 580883A JP 580883 A JP580883 A JP 580883A JP S59133929 A JPS59133929 A JP S59133929A
Authority
JP
Japan
Prior art keywords
roll
ring roll
pipe
eccentric ring
eccentric
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.)
Pending
Application number
JP580883A
Other languages
Japanese (ja)
Inventor
Seishiro Yoshihara
吉原　征四郎
Takao Kawanami
川並　高雄
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 JP580883A priority Critical patent/JPS59133929A/en
Priority to US06/571,534 priority patent/US4567744A/en
Priority to DE19843401595 priority patent/DE3401595A1/en
Publication of JPS59133929A publication Critical patent/JPS59133929A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof
    • B21C3/12—Die holders; Rotating dies

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Forging (AREA)
  • Metal Extraction Processes (AREA)

Abstract

PURPOSE:To decrease uniformly the sectional area of a long columnar body by supporting said body with supporting devices adjacent to an eccentric ring roll, pressing the caliber surface of the eccentric ring roll to the surface of the long columnar body and moving the calibers in the direction intersecting the long columnar body so that the part deformed plastically by pressing is advanced while it is moved circumferentially. CONSTITUTION:A pipe 7 inserted therein with a mandrel 6 is penetrated into an eccentric ring roll 4 by pushing forward the end part of the mandrel with a propelling device 14. The pipe 7 is supported with the caliber D1, D3 surfaces of supporting ring rolls 3, 4 and the pipe 7 is pushed into the working surface of the caliber D2 of the roll 4. When a gear 9 is supported in a housing 11 and is rotated, the inside surface 13 of a gear having the center different from the center of said gear rotates eccentrically and the roll 4 and the caliber D2 which are supported on the surface rotate eccentrically, thereby decreasing the wall thickness of the pipe 7 by pressure. The pressure decrease of the pipe 7 arises in the supporting ring roll part as well and the plastically deformed part rotates in the same direction at the angle different roughly by 180 deg. from the plastically deformed part in the eccentric ring roll part, by which the wall thickness is decreased. This method is applicable in rolling of a bar as well, in the same way as for the pipe.

Description

【発明の詳細な説明】 本発明は管または棒（以下管棒と呼ぶ）などの長柱体の
製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing long columns such as tubes or rods (hereinafter referred to as tube rods).

管棒は従来は圧延、押出し、引抜き、または鍛造などの
り・〃性加工法によって製造されていたが、技術的進歩
はすでに限界に達しており、革新的加工技術が待望され
ている１本発明はかかる期待に応えんとするものであっ
て、偏心リングロールだ隣接する長柱体支承装置によっ
て長注体乞支承し、該偏心リングロールの孔型作用面？
該長柱体の柱面に押圧して塑性変形せしめ、該偏心リン
クロールの孔型？長柱体と交叉する方向に運動せしめる
ことによって長柱体の塑′：生変形部ンその周方向（（
拡大せしめることを特徴とする。本発明法によって工具
寿命の延長１てよる限界圧下率や圧延長さの拡大、加工
の効率化１だよる設備の小型１ヒや加工迭１１Ｗの向上
、剪１析ひずみの減少による疵の減少が期待できる。Traditionally, tubes and rods have been manufactured by adhesive processing methods such as rolling, extrusion, drawing, or forging, but technological progress has already reached its limit, and innovative processing technology is eagerly awaited. In order to meet such expectations, the eccentric ring roll is supported by an adjacent long column support device, and the hole-shaped working surface of the eccentric ring roll is supported by an adjacent long column support device.
The hole shape of the eccentric link roll is changed by pressing against the column surface of the long column to cause plastic deformation. By moving the long column in the direction that intersects with the long column, the plasticity of the long column: the raw deformation part is
It is characterized by being enlarged. The method of the present invention extends the tool life by increasing the critical reduction rate and rolling length, improves the efficiency of machining by making the equipment smaller, increases the machining distance by 11W, and reduces flaws by reducing shear and analysis strain. can be expected.

木登ｔ３Ａに管の列で詳却ｌ　Ｋ説明すると、第Ｊ図ｊ
・ま本発明の実施態様？説明する装置側面図であって偏
心リングロール４の入イ則および出側に隣″：妾して管
の支承装置として支承リングロール３および５を配設し
、マンドレル６を挿入した管７乞マンドレル６の端部Ｚ
推進装置ｊＡ、　Ｋよシ押し進めて偏心リングロール４
に貫入せしめる。該偏心リングロールＪＬ壓Ｄ２と支承
リングロールの孔型Ｄｉ、　Ｄ３の寸法および位置は、
図１および図２に示す様に、管ビ支承リングロールの孔
型面で支承し、偏心リングロールの作用面が管に押し込
まれる様に選定する。第２図は第１図のＩ−１断面であ
って、偏心リングロールの偏心回転機構例を示している
。Detailed explanation of the row of pipes on the tree climbing t3A.
・What is the embodiment of this invention? 2 is a side view of the device to be described, showing the entrance and exit side of the eccentric ring roll 4: supporting ring rolls 3 and 5 are arranged as support devices for the pipe, and a pipe 7 with a mandrel 6 inserted therein; End Z of mandrel 6
Propulsion device jA, K push forward and eccentric ring roll 4
to penetrate. The dimensions and positions of the hole shapes Di and D3 of the eccentric ring roll JL diameter D2 and the supporting ring roll are as follows:
As shown in FIGS. 1 and 2, the pipe is supported on the grooved surface of the ring roll, and the working surface of the eccentric ring roll is selected to be pushed into the pipe. FIG. 2 is a cross section taken along line I-1 in FIG. 1, and shows an example of an eccentric rotation mechanism of an eccentric ring roll.

すなわち、ハウジング］］テ歯車９を支承して回転する
と１ツー車中心と中心２異てする歯車の内面１３は偏心
回転し、該層に支承される偏心リングロール４とその孔
型Ｄ２は偏心回転運動を行なう。このとき孔型Ｄ２の中
、ＬＬ、Ｌは、ハウジング１１および歯車９の外１円中
心Ｋｉ中心とする半径ＬＫの円運動を行なう。この様（
、（偏心リングロール４を動かすと、偏心リンクロール
の孔型Ｄ２により押圧されて塑・、俳変形した部分は管
の周方向に移動しながら進み、管の全周の肉、厚が圧減
されることになる。That is, when the housing]] Te gear 9 is rotated, the inner surface 13 of the gear, which is different from the center of the second wheel and the center of the second wheel, rotates eccentrically, and the eccentric ring roll 4 supported by the layer and its hole shape D2 rotate eccentrically. Perform a rotational movement. At this time, LL and L in the hole D2 perform a circular motion with a radius LK centered on the outer circular center Ki of the housing 11 and the gear 9. Like this (
(When the eccentric ring roll 4 is moved, the part that is pressed and plastically deformed by the hole D2 of the eccentric link roll moves in the circumferential direction of the pipe, and the wall and thickness of the entire circumference of the pipe are reduced. will be done.

管の肉ｊ阜の圧減は偏心リングロール４の押圧力によっ
て支承リングロール部によっても発生し、その塑性変形
部は偏心リングロール部の塑性変形部とほぼ１８０度異
なる角度で同方向に回転し、全周の肉厚が圧減されるこ
とになる。管ビ進めながらこの様な加工７行なうと、管
の肉厚はスパイラル状に圧減されて行くが、肉厚の変動
はリングロールの作用面に平行部・？設げること、およ
び偏心リングロールの偏心回転数乞十分大きくすること
によって、工業的に満足な範囲内に留めることができる
。Reduction of the pipe wall is also caused by the bearing ring roll part due to the pressing force of the eccentric ring roll 4, and its plastic deformation part rotates in the same direction at an angle that is approximately 180 degrees different from that of the plastic deformation part of the eccentric ring roll part. However, the thickness of the entire circumference will be reduced. If this process is carried out while the pipe is being rolled, the wall thickness of the pipe will be reduced in a spiral manner, but the variation in wall thickness will occur at the part parallel to the working surface of the ring roll. By increasing the number of eccentric rotations of the eccentric ring roll and making the eccentric rotation speed of the eccentric ring roll sufficiently large, it is possible to keep it within an industrially satisfactory range.

次に本発明の実１強態様列を示す。図１の設置Ｍｉ構成
例で第１表の条件で加工すると、外径７８１１１．ｍ、
肉、’！　２４　ｍｍの素管から、設ｆｌｉｊ　出口Ｔ
：　（（Ｊ外径４２　’ｎｍ、肉厚５．　Ｑ　ｍｍの管
が得られ、このときの断面積比（＝入側断面積／出側断
面積）は７０となり、従来８スタンドマンドレルミルの
柴犬断面比４よりはるかに太きい。Next, the most practical aspects of the present invention will be shown. When processing the installation Mi configuration example in FIG. 1 under the conditions shown in Table 1, the outer diameter is 78111. m,
meat,'! From a 24 mm raw pipe, set flij outlet T
: ((J outer diameter 42' nm, wall thickness 5. It is much thicker than the Shiba Inu cross section ratio of 4.

第１表 本発明では偏心リングロールを複数個用いることによっ
て一層大きな圧減７行なうことができる。Table 1 In the present invention, a larger reduction 7 can be achieved by using a plurality of eccentric ring rolls.

偏心リングロール乞隣接して配設する場合には、長柱体
の圧減効果２太きくするために、両者の孔型の偏心回転
の位相差が１８０度であシ、がっ、偏心回転の角速度か
等しいことが望ましい。また両者ケ隣接させることによ
って１個の歯止の中（Ｃ複数個の偏心リングロールを収
納させ、設備）と小さく設計することができる。When the eccentric ring rolls are placed adjacent to each other, in order to increase the reduction effect of the long column body, the phase difference between the eccentric rotations of the two holes should be 180 degrees. It is desirable that the angular velocity of In addition, by arranging both of them adjacent to each other, it is possible to design the device as small as one pawl (accommodating a plurality of eccentric ring rolls).

本発明において偏心リングロール４の外周部Ｆ３は、歯
車９の内部（（回転できない様（・で固定されていれば
、偏心リングロールの内面刀・ら長柱体の外面（て対し
て回転力が伝達され、長柱体は回転運動を起すとともに
その外画は周方向の剪断力上受げ、′管の１頃斜ロール
圧延法で見られる様ｒ剪断ひすみ７生ずる。しかし、偏
心リングロール乞歯車９の内部＋ｌｒＣ回私自在に支承
すれば、偏心リングロールの作用面と長柱体表面の回転
方向のすヘシがほぼ最小となる相対速Ｉｆｆとり、偏心
リングロールは長柱体面上Ｚ転動し、＠断ひずみ乞最小
とすることができる。長柱体の回転を防止するためには
支承リングロールも回転自在な構造とするか、偏心リン
グ孔型の回転方向とは逆方向に回転することが必要であ
る。このときの支承１ノングの回転数Ｎは偏心リング孔
型の回転数（−歯止９の回転数）Ｎ′と、当、被支承リ
ングロールの作用部平均側長りと、腋部の長柱体平均周
長Ｓとによってほぼ次の式によって求めることかできる
。In the present invention, the outer circumferential portion F3 of the eccentric ring roll 4 has a rotational force against the inner surface of the gear 9 (if it is fixed so that it cannot rotate), the inner surface of the eccentric ring roll is is transmitted, the long column body causes a rotational movement, and its outer surface receives a shearing force in the circumferential direction, causing shear strain 7 as seen in the oblique roll rolling method of the pipe.However, the eccentric ring If the roll bevel gear 9 is freely supported +lrC times inside, the relative speed Iff is set such that the hesitation between the working surface of the eccentric ring roll and the surface of the long column body in the rotational direction is almost minimum, and the eccentric ring roll is placed on the surface of the long column body. It can roll in Z and minimize the breaking strain.In order to prevent the rotation of the long column, the support ring roll should also have a rotatable structure, or it should be rotated in the opposite direction to the rotation direction of the eccentric ring hole type. At this time, the rotation speed N of the support 1 nong is the rotation speed of the eccentric ring hole type (-the rotation speed of the pawl 9) N', and the average working part of the supported ring roll. It can be determined approximately by the following equation using the side length and the average circumference S of the long column in the armpit.

Ｎ＝Ｎ’　（Ｌ−８）／Ｌ また、長柱体が外力によって回転しない様に保持されて
お９、刀・つ支承リングロールが回転自在に支承されて
いる場合（・では該支承ロールの回転数はほぼ上式で求
めることができる。N=N' (L-8)/L In addition, if the long column body is held so as not to rotate due to external force9, and the sword-supporting ring roll is rotatably supported (in ・, the supporting roll The rotation speed can be approximately determined using the above formula.

本発明法においてマンドレルを挿入した管の肉、厚乞圧
減せしめる場合には、管またはマンドレルまたはその両
方に入側から押込カケ作用させながら加工７行なうこと
によって、加工速度乞上昇し、管の送り速度ビ所定の値
に保つことによって管の変形を均一に行なうことができ
る。これと同じ効果は管またはマンドレルまたはその両
方に出側から引張力を作用させながら加工を行なうこと
によっても得ることができ、管またはマンドレルまたは
その両方に入側からシま押込カケ、出［ｔ］ｌｌ　；Ｏ
＞らは引張カン作用させながら加工を行なうことによっ
てなお一層大きな効果７得ることができる。In the method of the present invention, when reducing the thickness of a pipe into which a mandrel has been inserted, the processing speed is increased and the processing speed is increased by performing the process 7 while applying a push-cut action from the entry side of the pipe or the mandrel, or both. By keeping the feed rate at a predetermined value, the tube can be deformed uniformly. The same effect can also be obtained by processing the tube and/or mandrel while applying a tensile force from the exit side. ]ll ;O
An even greater effect 7 can be obtained by performing the processing while applying tension.

以上管の転造について説明したが、その加工原理から明
らかなように本発明は棒の転造知ついても管と同！底（
て応用可能である。Although the rolling of pipes has been explained above, it is clear from the processing principle that the present invention is capable of rolling rods in the same way as pipes! bottom(
It can be applied.

さら（て本発明は少なくともｍ一つの支承リングロール
の孔型と、該支承リングロール直前の長柱体の径よりも
小さくし、該支承リング孔型内に長注体乞入側から押込
みあるいは出側から引出すことによって外径あるいは外
差と肉厚ビ整えることができる。Furthermore, the present invention has a hole shape of at least m one support ring roll and a diameter smaller than the diameter of the long pillar body immediately in front of the support ring roll, and the long column body is pushed into the support ring hole shape from the side where the long column body is inserted or By pulling it out from the exit side, the outer diameter or outer difference and wall thickness can be adjusted.

本発明法において偏心リングロールに隣接する長柱体支
承装置は支承リンクロールに眼定されるものではなく、
例えば両側；ｔこ開閉自在な支持装置や、ローラ組によ
る支持装置または圧延ロール組であっても良い。In the method of the present invention, the long pillar support device adjacent to the eccentric ring roll is not considered to be a support link roll,
For example, it may be a supporting device that can be opened and closed on both sides, a supporting device using a set of rollers, or a set of rolling rolls.

本発明は偏心リンクロールを用い、ロールの作用面はリ
ングロールの内面である。このことば従来の転造工具が
円盤であってその外周を作用面として用いるのと異なり
、工具の周長を長くし、工具の負荷乞低下することによ
って工具寿命の延長？はかることができ、偏心リングロ
ールの形状が単純で剛１生か大きくでき、７）ｓつコン
パクトに設計できるので小型の設備で大きな圧下率乞得
ることができる。例えば回転数は管棒の外面上回転しな
がら圧延する従来のプラネタリクロスミルと比較すると
、本発明法は回転部分の重量を５分の１以下にでき、か
つ構造が単純で円形であるため、回転数：ま１０倍頃上
（ででき、加工能率は飛躍的（（向上できる。゛また管
ぞ回転しながら圧延する従来の傾斜ロール圧延機と比較
すると、傾斜ロール圧延機はロール７支持する機構が複
雑かつ巨大であり、間両であるのに対し、本発明法は機
構か単純で小型化でき安価である。従来法のプラネタリ
クロスミルや傾斜ロール圧延法が材料に著るしい剪断変
形ケ発生させるのに対し、本発明法は偏心リングロール
が素材の表面乞転動することによって剪断変形”ｉｌＮ
小にすることが可能で、疵防止（で対しても有利である
。さらに従来の８スタンドマンドレルミルに対しても、
実施態様例で比較して示した様に、本発明法は大きな断
面積減少７行なうことができ優れている。The present invention uses an eccentric link roll, and the working surface of the roll is the inner surface of the ring roll. Unlike conventional rolling tools, which are disks and use their outer periphery as the working surface, the tool life can be extended by increasing the circumference of the tool and reducing the load on the tool. 7) The shape of the eccentric ring roll is simple, the rigidity can be increased, and 7) it can be designed more compactly, so a large rolling reduction can be obtained with small equipment. For example, compared to conventional planetary cross mills in which the rotation speed is rolled while rotating on the outer surface of the tube and rod, the method of the present invention can reduce the weight of the rotating part to less than one-fifth, and has a simple and circular structure. The rotation speed can be increased by about 10 times, and the processing efficiency can be dramatically improved. Also, compared to a conventional inclined roll mill that rolls while the tube rotates, the inclined roll mill has 7 supported rolls. The mechanism is complex, huge, and time-consuming, whereas the method of the present invention has a simple mechanism, can be miniaturized, and is inexpensive.Conventional methods such as planetary cross mill and inclined roll rolling method cause significant shear deformation of the material. In contrast, in the method of the present invention, shear deformation is caused by the eccentric ring roll rolling on the surface of the material.
It can be made smaller and is also advantageous in terms of preventing scratches.Furthermore, compared to the conventional 8-stand mandrel mill,
As shown by comparison in the embodiment examples, the method of the present invention is superior in that it can achieve a large reduction in cross-sectional area.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の方法乞実施する装置の一例ンと示す側
断面図および第２図は第１図のＩ−Ｉ断面図である。 ４・・偏心リングロール、　３，５・・・支承リングロ
ール、　Ｄｉ、Ｄ２．Ｄ３・・−リングロールまたは支
承リングロール孔Ｗ　、６・−マンドレル、７・・−管
、　　８・・マンドレルの軸線、　　９・山車、１０・
・−歯車の回転方向、　１４・−推進装置、　Ｋ・・・
機械中心軸（偏心歯車の外円中心）　Ｌ・・リングロー
ル孔型中心軸 特許出願人代理人 弁理士　矢　葺　知　之 （ほか１名〕FIG. 1 is a side cross-sectional view showing an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is a cross-sectional view taken along line II in FIG. 4... Eccentric ring roll, 3, 5... Supporting ring roll, Di, D2. D3...-Ring roll or supporting ring roll hole W, 6...-Mandrel, 7...-Pipe, 8... Axis of mandrel, 9-Float, 10-
・-Direction of rotation of gears, 14.-Propulsion device, K...
Machine center axis (outer circle center of eccentric gear) L...Ring roll hole type center axis Patent applicant representative patent attorney Tomoyuki Yafuki (and 1 other person)

Claims (1)

【特許請求の範囲】 １　偏心リングロールに＠接する長柱体支承装置によっ
て長注体乞支承し、該偏心リングロールの孔型作用面？
該長柱体の柱面に押圧し、該偏心リングロールの孔型乞
長住体と交叉する方向に運動せしめることを特・徴とす
る長柱体の転造法。 ２　偏心リングロールの入側または出’１１１１または
その両側に支承リングロールビ配設した特許請求の範囲
第１項記載の方法。 ３　相＠ｐ合う偏心リングロールの孔型の偏心回転の位
相差が１．８０度てあジ、かつ偏心回転の商運、度が等
しい特許請求の範囲第１項または第２項記載の方法。 ４　マンドレル乞挿入した管の肉厚を圧減ぜしめる特許
請求の範囲第１項、第２項または第３項記載の方法。 ５　管またはマンドレルまたはその両方に入側から押込
力ぞ作用させながら行なう特許請求の範囲第４項記載の
方法。 ６　管また；・廿マンドレルまたはその両方に出側から
引張カン作用させながら行なう特許請求の範囲第４項記
載の方法。 ７　管またはマンドレルまたはその両方に入側からは押
込力ゲ、出側からは引張力２作用させながら行なう特許
請求の範囲第４項記載の方法。 ８　少なくとも一つの支承リングロールの孔型が該支承
リンンロールの孔型直前の長柱体の径よりも小さいこと
乞特徴とする特許請求の範囲第４項、第５項、第６項ま
たは第７項記載の方法。[Scope of Claims] 1. A long beam supported by a long pillar support device in contact with an eccentric ring roll, and a hole-shaped working surface of the eccentric ring roll?
A method for rolling a long column body, characterized in that the column surface of the long column body is pressed and the eccentric ring roll is moved in a direction intersecting with the hole-shaped longitudinal body. 2. The method according to claim 1, wherein a supporting ring roll is disposed on the entrance or exit side 1111 of the eccentric ring roll or on both sides thereof. 3. The method according to claim 1 or 2, in which the phase difference between the eccentric rotations of the holes of the eccentric ring rolls that match the phase @p is 1.80 degrees, and the business luck of the eccentric rotations is equal. . 4. The method according to claim 1, 2 or 3, which reduces the wall thickness of a tube into which a mandrel is inserted. 5. The method according to claim 4, wherein the method is carried out while applying a pushing force to the tube or the mandrel or both from the entry side. 6. The method according to claim 4, wherein the method is carried out while applying a tensile force to the pipe or the mandrel or both from the outlet side. 7. The method according to claim 4, wherein the method is carried out while applying a pushing force of 2 to the tube or the mandrel or both from the inlet side and 2 tensile forces to the outlet side. 8. Claims 4, 5, 6, or The method described in Section 7.
JP580883A 1983-01-19 1983-01-19 Rolling method of long columnar body Pending JPS59133929A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP580883A JPS59133929A (en) 1983-01-19 1983-01-19 Rolling method of long columnar body
US06/571,534 US4567744A (en) 1983-01-19 1984-01-17 Method and apparatus for forming long cylindrical metal products
DE19843401595 DE3401595A1 (en) 1983-01-19 1984-01-18 METHOD AND DEVICE FOR MOLDING CYLINDRICAL PRODUCTS FROM METAL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP580883A JPS59133929A (en) 1983-01-19 1983-01-19 Rolling method of long columnar body

Publications (1)

Publication Number Publication Date
JPS59133929A true JPS59133929A (en) 1984-08-01

Family

ID=11621379

Family Applications (1)

Application Number Title Priority Date Filing Date
JP580883A Pending JPS59133929A (en) 1983-01-19 1983-01-19 Rolling method of long columnar body

Country Status (1)

Country Link
JP (1) JPS59133929A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63309347A (en) * 1987-06-10 1988-12-16 Ishikawajima Harima Heavy Ind Co Ltd Pipe forging device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63309347A (en) * 1987-06-10 1988-12-16 Ishikawajima Harima Heavy Ind Co Ltd Pipe forging device

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