JPS6031563B2 - Erhardt pipe manufacturing method - Google Patents
Erhardt pipe manufacturing methodInfo
- Publication number
- JPS6031563B2 JPS6031563B2 JP3329280A JP3329280A JPS6031563B2 JP S6031563 B2 JPS6031563 B2 JP S6031563B2 JP 3329280 A JP3329280 A JP 3329280A JP 3329280 A JP3329280 A JP 3329280A JP S6031563 B2 JPS6031563 B2 JP S6031563B2
- Authority
- JP
- Japan
- Prior art keywords
- steel ingot
- tube
- container
- steel
- mandrel
- 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
Links
Landscapes
- Metal Extraction Processes (AREA)
Description
【発明の詳細な説明】
本発明は加熱した鋼片の中央部にマンドレルを圧入して
底付き素管を製造し、この底付き素管をこれにマンドレ
ルに挿入した状態でダイスを用いて押抜加工を施して底
付き成形管とし、この成形管の頭部を切り落して管とす
る所謂ェルハルト・プッシュベンチ方式による製管法の
改良に関するものである。[Detailed Description of the Invention] The present invention involves press-fitting a mandrel into the center of a heated steel piece to produce a base tube with a bottom, and pressing the base tube with a die using a die while inserting the base tube into the mandrel. This invention relates to an improvement in the pipe manufacturing method using the so-called Erhardt-Push Bench method, in which a tube is punched to form a bottomed tube, and the head of the tube is cut off to form a tube.
従来、このェルハルト製管法によって管を製造する場合
、素材たる鋼片として未加工の鋼塊を用いる時は第２図
イ〜木に示す如き工程にて実施されている。Conventionally, when manufacturing a pipe using the Erhardt pipe manufacturing method, when an unprocessed steel ingot is used as a raw material steel billet, the process is carried out as shown in FIGS.
即ち、先ず所定の鋳型に溶湯を入れて断熱押湯造魂法に
より、第２図イに示す如き鋼塊２０を得、この鋼魂２０
の頭部中央における不純物の濃厚偏折部２１ａ及び頭部
周辺における鋼塊肩部２１ｂ等を含む所護押傷部２１を
、例えばコールドソー等を用いて破線ｘ−ｘにて示す位
置から切り落す。次に押傷部２１を切断した鋼塊２０を
加熱炉にて所定温度に加熱した後、これを底部側から第
２図口に示す如き、上部に開口部を有する断面Ｕ形の有
底容器、即ちコンテナＣに挿入し、第２図ハに示す如く
コンテナＣの開□部にセットしたガイド部材Ｇの孔を通
してマンドレルＭ，の先端部を鋼塊２０の頭部中央から
所要深さに迄圧入して底付き素管２２を製造し、次いで
コンテナＣの底部中央に配設されている押上げロッドＲ
を作動して第２図二に示す如く底付き素管２２をコンテ
ナＣから取り出す。そしてこのようにして得た底付き素
管２２を通常再度加熱炉にて所定温度に加熱した後マン
ドレルＭ２に差し込んで、マンドレルＭ２の先端面を底
付き素管２２の底部内面に突き当てた状態で第２図ホに
示す如く例えばタンデムに配置されたダイスＤ，〜Ｄ４
にその底部側から挿入し、底付き秦管２２の底部外面を
冷却しながら熱間押抜加工を施して所定の内、外径を有
する底付き成形管２３とし、底付き成形管２３の底部２
３ａを切断して管２４を得、更にこの管２４の内、外面
の所定量を袷間にて切削加工し、製品に仕上げている。That is, first, molten metal is poured into a predetermined mold, and the steel ingot 20 as shown in FIG.
Using a cold saw or the like, for example, cut the protected dented part 21 including the concentrated impurity deflection part 21a at the center of the head and the steel ingot shoulder part 21b around the head from the position indicated by the broken line x-x. drop Next, the steel ingot 20 with the dented part 21 cut off is heated to a predetermined temperature in a heating furnace, and then it is placed into a bottomed container with a U-shaped cross section and an opening at the top, as shown in the opening in Figure 2 from the bottom side. That is, insert the mandrel M into the container C, and insert the tip of the mandrel M through the hole of the guide member G set in the opening □ of the container C as shown in FIG. Press fit to manufacture the base pipe 22 with a bottom, and then press the push-up rod R disposed at the center of the bottom of the container C.
is operated to take out the bottomed tube 22 from the container C as shown in FIG. The base tube 22 with the bottom thus obtained is usually heated again to a predetermined temperature in a heating furnace, and then inserted into the mandrel M2, so that the tip end surface of the mandrel M2 is brought into contact with the inner surface of the bottom of the base tube 22 with the bottom. For example, the dice D, ~D4 arranged in tandem as shown in Figure 2 E
The outer surface of the bottom of the bottomed Qin tube 22 is cooled and hot stamped to form a bottomed formed tube 23 having predetermined inner and outer diameters. 2
3a is cut to obtain a tube 24, and a predetermined amount of the inner and outer surfaces of this tube 24 are cut with a lining to finish the product.
ところで上述した如き方法にあっては鋼塊２０から管２
４を製造する迄の過程において、鋼塊２０の段階でその
押湯部２１の切断工程が、また底付き成形管２３から管
２４を得る段階で底部２３ａの切断工程が必要となって
いる。前者の場合は既述した如く、鋼塊２０の頭部中央
が不純物等の三農厚偏析部２１ａとなっているため、こ
の部分に直接マンドレルＭ，を圧入すると、膿厚偏折部
２１ａが底付き素菅２２の内周壁に広範囲に拡大伸展さ
れる結果、この拡大伸展された濃厚偏析部２１ａを除去
するための内面切削加工量が極めて大きくなり切削加工
に多大の工数を要することとなるからであり、また後者
の場合は底付き成形管２３を管２４に仕上げる上で当然
必要とされるものである。しかし上述した如き２度の切
断によって失われる切捨て量は大きく、それに伴う歩留
の低下が避けられないし、また２度の切断工程を要する
ことによる工数の増加のため生産能率に与える影響も大
きい。By the way, in the method described above, the pipe 2 is separated from the steel ingot 20.
4, a process of cutting the feeder part 21 is required at the stage of forming the steel ingot 20, and a process of cutting the bottom part 23a at the stage of obtaining the tube 24 from the formed tube 23 with bottom. In the former case, as mentioned above, the center of the head of the steel ingot 20 is the thick segregation part 21a of impurities, so if the mandrel M is directly press-fitted into this part, the thick segregation part 21a will be formed. As a result of being expanded and stretched over a wide range on the inner circumferential wall of the bottomed bare tube 22, the amount of internal cutting to remove the expanded and expanded thick segregated portion 21a becomes extremely large, requiring a large number of man-hours for cutting. In the latter case, it is naturally necessary to finish the formed tube 23 with a bottom into the tube 24. However, a large amount of waste is lost due to the above-mentioned two-time cutting, resulting in an unavoidable decrease in yield, and the increase in man-hours due to the two-time cutting process also has a large impact on production efficiency.
本発明者等は上述した如きェルハルト製管法、特に、素
材たる鋼片として分塊圧延、鍛造等による塑性加工を施
さない未加工の鋼塊を用いる場合において、鋼塊２０か
ら底付き素管２２を製造する工程についての実験研究を
行った結果、鋼塊２０をコンテナＣに挿入する際、鋼塊
２０をその底部側からではなく、頭部側則ち押濠部２１
側からコンテナＣ内に逆向きに挿入し、この状態でコン
テナＣの閉口部側に位置する鋼塊２０の底部中央からマ
ンドレルＭ，を圧入して底付き素管２２を製造すること
により本来鋼塊２０の段階にて切り落されるべき押湯部
２１を底付き成形管２３の底部２３ａとして切り落すこ
とが出来て、鋼塊２０の段階での押傷部２１の切断工程
が省略出来、切断工程は底付き成形管２３から管２４を
得るべく底部２３ａを切断する場合のみの一回で済ませ
得て、工数が大幅に減少し、歩蟹りも著しく向上し得る
ことを知見した。The present inventors used the Erhardt pipe manufacturing method as described above, especially when using an unprocessed steel ingot that has not been subjected to plastic working such as blooming rolling or forging as a raw material steel billet. As a result of experimental research on the process of manufacturing 22, it was found that when inserting the steel ingot 20 into the container C, the steel ingot 20 is not inserted from the bottom side, but from the head side, that is, the push moat part 21.
Insert the steel ingot 20 from the side in the opposite direction into the container C, and in this state press fit the mandrel M from the center of the bottom of the steel ingot 20 located on the closed side of the container C to manufacture the bottomed pipe 22. The riser part 21 that should be cut off at the stage of the ingot 20 can be cut off as the bottom part 23a of the bottomed forming tube 23, and the process of cutting the dented part 21 at the stage of the steel ingot 20 can be omitted. It has been found that the cutting process can be completed only once when cutting the bottom portion 23a to obtain the tube 24 from the formed tube 23 with a bottom, which greatly reduces the number of man-hours and significantly improves the cutting speed.
更に上述した工程を実施するに際しては鋼塊２０として
従来一般に用いられている断熱押湯による鋼塊よりも雷
弧押傷鋼塊等を使用するのがより好ましい結果が得られ
ることを知見した。即ち断熱押湯造塊法による鋼魂２０
の場合は頭部における中央部すなわち押傷ひげ部２１ｃ
と、周辺部すなわち鋼塊肩部２１ｂとの段差そ′が大き
いために、鋼魂２０を加熱した後第３図に示す如くコン
テナＣに挿入したとき、断面鋭角状に大きく突出した周
辺部、即ち鋼塊肩部２１ｂのみがコンテナＣの底部内面
に接触した状態となって鋼塊肩部２１ｂが他の部分に比
較して急速に降溢され、ここに内部応力が形成される結
果、鋼塊２川こマンドレルＭ．を圧入して底付き素管２
２を形成した時、第４図に示す如く鋼塊肩部２１ｂとし
て存在していた部分が位置する底付き素管２２における
底部２２ａ近傍のａ，ｂ部分に亀裂がまま発生し、後工
程のプッシュベンチにおける底付き素管２２の熱間押抜
加工時に、マンドレルＭ２が底付き素管２２の底部２３
ａを突き抜く、所謂底抜け現象が生じて押抜加工を行う
ことが出来なくなる。これに対して亀弧押傷鋼塊、水張
鋼塊の場合、鋼塊の頭部表面がその中央部、即ち押傷ひ
げ部と周辺部、即ち鋼塊肩部との間に殆んど段差のない
平坦な状態となっているため、鋼塊肩部と押傷ひげ部と
の間に降温速度の差が殆んど生じず、内部応力が極めて
小さく、上述した如き亀裂に伴う底抜け現象の発生を防
止し得ることとなる。本発明はかかる知見に基し、てな
されたものであって、その目的とするところはコンテナ
に対して鋼塊をその底部側から挿入することによって、
鋼塊の段階での押湯部に対する切断工程が省略出来、大
幅な工数の減少、歩概の向上が図れ、製管能率を著しく
高め得るェルハルト製管法を提供するにある。Furthermore, when carrying out the above-mentioned process, it has been found that more preferable results can be obtained by using a lightning arc stamped steel ingot or the like as the steel ingot 20, rather than a steel ingot formed by an insulating feeder, which has been generally used in the past. In other words, steel soul 20 made by the insulated riser ingot making method.
In the case of
Since there is a large step between the steel core 20 and the peripheral part, that is, the shoulder part 21b of the steel ingot, when the steel core 20 is heated and then inserted into the container C as shown in FIG. In other words, only the steel ingot shoulder 21b is in contact with the inner surface of the bottom of the container C, and the steel ingot shoulder 21b overflows more rapidly than other parts. As a result, internal stress is formed there, and the steel Mass 2 river mandrel M. Press-fit the base tube 2 with a bottom.
2, as shown in Fig. 4, cracks were still generated in parts a and b near the bottom 22a of the bottomed blank tube 22, where the part that existed as the steel ingot shoulder 21b was located, and this caused problems in the subsequent process. During hot punching of the base tube 22 with a bottom on a push bench, the mandrel M2 presses the bottom 23 of the base tube 22 with a bottom.
A so-called bottoming-out phenomenon occurs, making it impossible to perform punching. On the other hand, in the case of tortoise-curved steel ingots and water-filled steel ingots, the head surface of the steel ingot is mostly between the central part, that is, the stamped beard part, and the peripheral part, that is, the shoulder part of the steel ingot. Because it is in a flat state with no steps, there is almost no difference in the rate of cooling between the shoulder part of the steel ingot and the whisker part, and the internal stress is extremely small, which prevents the bottoming out phenomenon that accompanies cracks as described above. This will prevent the occurrence of The present invention has been made based on this knowledge, and its purpose is to insert a steel ingot into a container from the bottom side.
It is an object of the present invention to provide an Erhardt pipe manufacturing method which can omit the cutting process for a riser part at the steel ingot stage, greatly reduce the number of man-hours, improve the step schedule, and significantly increase pipe manufacturing efficiency.
本発明に係るェルハルト製管法は素材たる鋼片として鋼
塊肩部と押傷ひげ部との段差が３仇吻以内である鋼塊、
換言すれば鋼塊頭部上面が可及的に平坦な鋼塊を用い、
該鋼塊を加熱してその頭部側からコンテナ内に挿入し、
該コンテナ内に挿入した鋼塊の中央部にマンドレルを圧
入して底付き秦管を形成し、この底付き系管をプッシュ
ベンチにて所定寸法に熱間押抜き加工した後、底部を切
断して管とすることを特徴とする。The Erhardt pipe manufacturing method according to the present invention uses a steel ingot as a raw material in which the step difference between the shoulder part of the steel ingot and the bead part of the stamped part is within 3 degrees.
In other words, using a steel ingot whose top surface is as flat as possible,
The steel ingot is heated and inserted into the container from the head side,
A mandrel is press-fitted into the center of the steel ingot inserted into the container to form a bottomed pipe, and this bottomed pipe is hot-punched to a predetermined size on a push bench, and then the bottom is cut. It is characterized by being a pipe.
以下本発明をその実施過程を示す図面に基いて具体的に
説明する。The present invention will be specifically explained below based on drawings showing the implementation process.
第１図は本発明に係るヱルハルト製管法（以下本発明方
法という）の工程を示す模式図であって、先ず第１図イ
に示す如き鋼塊１を製造する。即ち鋼塊１は横断面が矩
形（円形等であってもよい）であって、その対角線寸法
は第１図口に示すコンテナＣ内への挿入が可能なようコ
ンテナＣの内蓬よりも僅かに小さく設定し、その頭部、
即ち押傷部１１は不純物の渡厚偏析部１１ａがある中央
部、即ち押湯ひげ部１１ｃと周辺部、即ち鋼塊肩部１１
ｂとの段差夕が可及的に僅かである。換言すれば頭部上
面が鋼塊肩部１１ｂから押傷ひげ部１１ｃにかけて略平
坦なものを製造する。鋼塊肩部１１ｂと押傷ひげ部１１
ｃとの段差そは３仇舷以内とする必要があり、好ましく
は２仇松以内とする。このような条件に適合する鋼塊の
製造方法としては通常、溶湯を鋳型に入れて固化させる
過程において、溶傷表面に電極を臨ませ、電極と港湯表
面との間に電弧を発生させつつ漸次固化させる、所謂露
孤押湯造塊法、或し、は溶湯を鋳型に入れて固化させる
過程で溶傷表面に水を張って表面を平坦化する、所謂水
張造塊法等が適用できる。上述した如き鋼塊１は例えば
プッシャー式連続加熱炉、台車式加熱炉等にて所定温度
に加熱した後、第１図口に示す如く頭部側から逆向きに
コンテナＣ内に挿入する。FIG. 1 is a schematic diagram showing the steps of the Erhard pipe manufacturing method according to the present invention (hereinafter referred to as the "method of the present invention"). First, a steel ingot 1 as shown in FIG. 1A is manufactured. That is, the steel ingot 1 has a rectangular cross section (it may be circular, etc.), and its diagonal dimension is slightly smaller than the inner diameter of the container C so that it can be inserted into the container C shown at the opening in Figure 1. Set its head smaller,
That is, the dented portion 11 is located at the central portion where the impurity segregation portion 11a is located, that is, the riser whisker portion 11c, and the peripheral portion, that is, the steel ingot shoulder portion 11.
The difference in height from b is as small as possible. In other words, the upper surface of the head is substantially flat from the steel ingot shoulder portion 11b to the pressed beard portion 11c. Steel ingot shoulder portion 11b and pressed beard portion 11
The height difference between the ship and C must be within 3 yards, preferably within 2 yards. The method of manufacturing steel ingots that meets these conditions is usually to place an electrode facing the melted surface during the process of putting molten metal into a mold and solidifying it, and to generate an electric arc between the electrode and the surface of the hot water. The so-called roko-bosei agglomeration method, in which the molten metal is gradually solidified, or the so-called water-filled agglomeration method, in which the molten metal is placed in a mold and solidified by applying water to the surface to flatten the surface, are applied. can. The steel ingot 1 as described above is heated to a predetermined temperature in, for example, a pusher-type continuous heating furnace, a cart-type heating furnace, etc., and then inserted into a container C from the head side in the opposite direction as shown in the opening in FIG.
鋼塊１をコンテナＣに挿入した状態では鋼塊１はその頭
部における鋼塊肩部１１ｂがコンテナＣの底部内周壁に
点接触し、また鋼塊１とコンテナＣの内周壁との間及び
鋼塊１の頭部表面とコンテナＣの底部内面との間には夫
々所要の隙間が形成された状態となっている。次いで第
１図ハに示す如くコンテナＣの閉口部にガイド部材Ｇを
セットし、ガイド部材Ｇの中央に閉口する孔を通してマ
ンドレルＭ，をコンテナＣ内に挿入し、マンドレルＭ，
の先端部をコンテナＣ内に挿入された鋼塊１にその底部
中央から圧入してゆく。マンドレルＭ．の圧入によって
鋼塊１とコンテナＣの内周面との間の隙間が埋められて
ゆき、マンドレルＭ．の先端部がコンテナＣの底部内面
から所要高さの位置まで圧入されたときマンドレルＭ，
を抜き出し、第１図二に示す如くコンテナＣの底部中央
に臨ませてある押し上げロッドＲを上昇させ、形成され
た底付き素替１２をコンテナＣから押し出す。この底付
き素管１２においては、鋼魂１における不純物の濃厚偏
析部１１ａとして存在していた部分が、第１図二におい
て点々を付して示す如く底付き素管１２の底部外面にそ
の中央部から周辺部側に向けて所要深さで分布している
。なお、前述した如く鋼塊頭部における段差そが極めて
４・さし、からコンテナＣの内面に当接した鋼塊肩部１
１ｂが急速に降溢することが少なくなるので段差が大き
い従来の鋼塊における如く底部に亀裂が発生することが
なくなる。When the steel ingot 1 is inserted into the container C, the steel ingot shoulder 11b at the head of the steel ingot 1 is in point contact with the bottom inner peripheral wall of the container C, and there is a gap between the steel ingot 1 and the inner peripheral wall of the container C. A required gap is formed between the head surface of the steel ingot 1 and the bottom inner surface of the container C, respectively. Next, as shown in FIG.
The tip of the container C is press-fitted into the steel ingot 1 inserted into the container C from the center of its bottom. Mandrel M. The gap between the steel ingot 1 and the inner peripheral surface of the container C is filled by press-fitting the mandrel M. When the tip of the mandrel M is press-fitted to the required height from the inner surface of the bottom of the container C, the mandrel M,
is pulled out, and the push-up rod R facing the center of the bottom of the container C is raised as shown in FIG. In this base tube 12 with a bottom, the portion that existed as a densely segregated area 11a of impurities in the steel core 1 is located at the center of the outer surface of the bottom of the base tube 12 as shown with dots in FIG. It is distributed at the required depth from the area toward the periphery. In addition, as mentioned above, the height difference at the head of the steel ingot is extremely large, and the shoulder part 1 of the steel ingot that is in contact with the inner surface of the container C is
Since 1b is less likely to overflow rapidly, cracks do not occur at the bottom as in conventional steel ingots with large steps.
このようにして得た底付き素替１２は通常再度加熱炉に
て所定温度に加熱されて次に第１図木に示す如くマンド
レルＭ２に差し込み、マンドレル地の先端面を底付き素
管１２の底部内面に突き当てた状態でプッシュベンチ（
図示せず）上に例えば図示の如くタンデムに配設された
複数のダイスＤ，，Ｄ２，Ｄ３，Ｄ４にその底部１２ａ
側から挿入し所定の内、外径を有する底付き成形管１３
に熱間押抜加工しても底抜け現象を生じることがない。The base tube 12 obtained in this manner is usually heated again to a predetermined temperature in a heating furnace, and then inserted into a mandrel M2 as shown in FIG. Push bench (
For example, as shown in the figure, a plurality of dice D, , D2, D3, D4 are disposed on the bottom 12a of the dice (not shown).
Molded tube 13 with a bottom inserted from the side and having a predetermined inner and outer diameter
No bottoming out phenomenon occurs even when hot stamping is performed.
この底付き素管１２においては前記した鋼塊１における
不純物の濃厚偏折部１１ａとして存在していた部分は第
１図へにおいて点々を付して示す如く底付き成形管１３
の底部外面に主として分布することとなる。底付き成形
管１３の底部１３ａを、前記した濃厚偏折部１１ａとし
て存在していた部分が管１４側に残留しないようコール
ドソ一等を用いて切り落すことにより、膿厚偏析部１１
ａを含まない管１４が得られる。In this base tube 12 with a bottom, the portion that existed as the concentrated uneven portion 11a of impurities in the steel ingot 1 is removed from the formed tube 12 with a bottom as shown with dots in FIG.
It is mainly distributed on the bottom outer surface of the By cutting off the bottom part 13a of the formed tube 13 with a bottom using a cold saw so that the part that existed as the thick segregated part 11a does not remain on the tube 14 side, the thick segregated part 11 is removed.
A tube 14 is obtained that does not contain a.
而して本発明方法にあっては底付き成形管１３の底部１
３ａを切り落して管１４を得る際に、鋼塊１において不
純物の濃厚偏折部１１ａとして存在していた部分を切り
落すことが出来ることとなって、鋼塊１の段階での押湯
部１１の切断工程が全く不要となり、切断工程が底付き
成形管１３から管１４を得る際の１回で済み、工数を大
幅に減少でき、歩解及び管１４の生産能率の著しい向上
が図れることとなる。Therefore, in the method of the present invention, the bottom part 1 of the bottomed forming tube 13
3a to obtain the tube 14, it is possible to cut off the portion that existed as the impurity-rich polarized portion 11a in the steel ingot 1, and the riser portion 11 at the stage of the steel ingot 1 can be cut off. The cutting process is completely unnecessary, and the cutting process is only required once when obtaining the tube 14 from the bottomed formed tube 13, which greatly reduces the number of man-hours and significantly improves the yield rate and the production efficiency of the tube 14. Become.
次に本発明方法による場合の歩留の状態を試験例に基い
て説明する。Next, the yield status in the case of the method of the present invention will be explained based on test examples.
試験においては鋼塊としてＣ：０．丸重量％、Ｍｎ：０
．８重量％の炭素鋼を用いた。そして本発明方法に用い
た鋼塊は溶湯を鋳型に入れて電弧加熱にて押湯を行って
押湯ひげ部と鋼塊肩部との段差が２仇肌である第１図イ
に示す形状のものを用い、また従来方法に用いた鋼塊は
断熱押湯造塊法によって得た前記段差が１４物舷である
第２図イに示す形状のものを用いた。表１
表１から明らかなように、本発明方法による場合は、底
付き成形管に対する切捨率は濃厚偏析部を管側に残さな
いよう切断するため、従来方法に比較して２％大きくな
っているが、鋼塊の段階での切捨率が０％であるため、
合計としては従来方法に比較して１０％の歩蟹向上が図
れている。In the test, C:0. Round weight%, Mn: 0
．． 8% by weight carbon steel was used. The steel ingot used in the method of the present invention is obtained by placing the molten metal in a mold and raising the ingot by electric arc heating, so that the ingot has the shape shown in Fig. 1A, with a height difference of 2 degrees between the riser whisker and the shoulder of the ingot. The steel ingot used in the conventional method had the shape shown in FIG. 2A, and the step was 14 broadsides, obtained by the adiabatic riser ingot making method. Table 1 As is clear from Table 1, in the case of the method of the present invention, the truncation rate for the formed tube with a bottom is 2% higher than that of the conventional method because the cutting is done so as not to leave the dense segregated part on the tube side. However, since the truncation rate at the steel ingot stage is 0%,
In total, a 10% improvement in walking speed was achieved compared to the conventional method.
以上の如く本発明方法にあっては切断工程が底付き成形
管から管を得る場合の一回のみで済み、鋼塊の段階での
切断工程が省略できることとなって、これに伴う工数が
減少し得て生産能率が著しく向上し、また、歩留も大幅
に向上し、且つまたプッシュベンチにおける押板加工に
際しても底抜け現象が生じることがないなど、本発明は
優れた効果を奏する。As described above, in the method of the present invention, the cutting process is only required once when obtaining a tube from a formed tube with a bottom, and the cutting process at the steel ingot stage can be omitted, reducing the number of man-hours involved. The present invention has excellent effects, such as significantly improving production efficiency, significantly improving yield, and preventing bottoming out during press plate processing on a push bench.
第１図イ〜へは本発明方法の実施過程を示す漠式図、第
２図イ〜へは従来方法の実施過程を示す模式図、第３図
は断熱押湯造塊法による鋼塊を用いて本発明方法を実施
する場合の説明図、第４図は同じくそれによって製造さ
れた底付き成形管の説明図である。
１・・・・・・鋼塊、１１・・・・・・押傷部、１１ａ
・・・・・・濃厚偏析部、１１ｂ…・・・肩部、１１ｃ
・・・・・・押傷ひげ部、１２…・・・底付き素管、１
３・・…・底付き成形管、１４……管、Ｃ……コンテナ
、Ｍ，，Ｍ２・・…・マンドレル、Ｄ，〜Ｄで・・・・
・ダイス。
第３図第４図
第１図
第２図Figures 1-A are vague diagrams showing the implementation process of the method of the present invention, Figures 2-A-2 are schematic diagrams showing the implementation process of the conventional method, and Figure 3 is a schematic diagram showing the implementation process of the conventional method. FIG. 4 is an explanatory diagram of the case where the method of the present invention is carried out using the same method, and FIG. 1... Steel ingot, 11... Pressure part, 11a
...Dense segregation part, 11b...Shoulder part, 11c
...Pressed beard part, 12...Main tube with bottom, 1
3... Formed tube with bottom, 14... Tube, C... Container, M,, M2... Mandrel, D, ~D...
·dice. Figure 3 Figure 4 Figure 1 Figure 2
Claims (1)
が３０ｍｍ以内である鋼塊を用い、該鋼塊をその頭部側
からコンテナ内に挿入し、該コンテナ内に挿入した鋼塊
底部中央にマンドレルを圧入して底付き素管を形成し、
該底付き素管をプツシユベンチにて所定寸法に押抜き加
工した後、底部を切断除去して管となすことを特徴とす
るエルハルト製管法。1. Using a steel ingot with a height difference of 30 mm or less between the shoulder of the steel ingot and the riser sink as the material steel billet, insert the steel ingot into a container from the head side, and then insert the steel ingot into the container. A mandrel is press-fitted into the center of the bottom of the block to form a base tube with a bottom.
The Erhard pipe manufacturing method is characterized in that the base pipe with a bottom is punched out to a predetermined size on a push bench, and then the bottom portion is cut and removed to form a pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3329280A JPS6031563B2 (en) | 1980-03-14 | 1980-03-14 | Erhardt pipe manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3329280A JPS6031563B2 (en) | 1980-03-14 | 1980-03-14 | Erhardt pipe manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56128611A JPS56128611A (en) | 1981-10-08 |
| JPS6031563B2 true JPS6031563B2 (en) | 1985-07-23 |
Family
ID=12382457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3329280A Expired JPS6031563B2 (en) | 1980-03-14 | 1980-03-14 | Erhardt pipe manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6031563B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5093170B2 (en) * | 2009-03-25 | 2012-12-05 | 住友金属工業株式会社 | Erhard's drilling method and core for Erhard's drilling |
| CN103974788B (en) | 2012-05-14 | 2015-08-26 | 新日铁住金株式会社 | The manufacture method of seamless steel pipe |
-
1980
- 1980-03-14 JP JP3329280A patent/JPS6031563B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56128611A (en) | 1981-10-08 |
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