JPS6157096B2 - - Google Patents

Info

Publication number
JPS6157096B2
JPS6157096B2 JP57006068A JP606882A JPS6157096B2 JP S6157096 B2 JPS6157096 B2 JP S6157096B2 JP 57006068 A JP57006068 A JP 57006068A JP 606882 A JP606882 A JP 606882A JP S6157096 B2 JPS6157096 B2 JP S6157096B2
Authority
JP
Japan
Prior art keywords
bar
billet
perforated
bending
strain
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
Application number
JP57006068A
Other languages
Japanese (ja)
Other versions
JPS58125313A (en
Inventor
Yutaka Mihara
Tomoshige Shudo
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.)
JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
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 Kokan Ltd filed Critical Nippon Kokan Ltd
Priority to JP606882A priority Critical patent/JPS58125313A/en
Publication of JPS58125313A publication Critical patent/JPS58125313A/en
Publication of JPS6157096B2 publication Critical patent/JPS6157096B2/ja
Granted legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/10Piercing billets

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Extrusion Of Metal (AREA)

Description

【発明の詳細な説明】 本発明は、熱間押出し用穿孔ビレツトの偏肉発
生防止方法および装置の創案に係り、熱間押出鋼
管の製造過程におけるプレス穿抗時のバー曲りを
適切に矯正制御せしめて穿孔中に発生する偏肉を
直接穿孔法においても有効に解消縮減ることので
きる方法および装置を得ようとするものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the invention of a method and device for preventing uneven thickness of a perforated billet for hot extrusion, and for appropriately controlling bar bending during press perforation in the manufacturing process of hot extruded steel pipes. At the very least, it is an object of the present invention to provide a method and apparatus that can effectively eliminate and reduce uneven thickness that occurs during drilling even in the direct drilling method.

熱間押出し用穿孔ビレツトを得る方法として
は、従来から直接穿孔法(ダイレクトピアシング
法)、エキスパンシヨン法があるが、これらの方
法によるものは何れも偏肉が発生し、又コスト
高、歩留り低下などを来す不利がある。即ち、直
接穿孔法は第1図に示すようにバツクアツプ機構
21を有するコンテナー22内に入れたビレツト
23に、バー24のセンターを合わせ、バー24
先端のポイント25を押し込んで最終的に打ち抜
き、素管(ホローピース)とするものであるが、
このような穿孔をなすに当つては実際のビレツト
に偏熱があり、又油滑条件も不均一であるので、
前記ポイント25の側面に偏つた力が作用し、バ
ー24が曲つて穿孔されることとなつて偏肉が発
生し、斯くして一旦発生した偏肉はその後の該素
管に対する加工に困難を与え、又好ましい最終製
品を得難くする。これに対しエキスパンシヨン法
は第2図に示ようにビレツト23に予めパイロツ
トホール26を削孔してから第1図ものと同様に
バー24先端のポイントを押し込んでパイロツト
ホール26の内径を押し拡げて行くもので、パイ
ロツトホール26が予め削孔されているだけに直
接穿孔法よりは偏肉の発生を縮減できるが、ビレ
ツト23に対し1本毎に機械加工によりそのパイ
ロツトホール26を形成することが必要であるか
らコスト高となり、又歩留りも低下する不利があ
る。
Traditional methods for obtaining perforated billets for hot extrusion include the direct piercing method and the expansion method, but these methods all result in uneven thickness, high cost, and low yield. There are disadvantages such as a decline. That is, in the direct drilling method, as shown in FIG.
The point 25 at the tip is pushed in and finally punched out to form a hollow piece.
When making such holes, there is uneven heat in the actual billet and the oil lubrication conditions are uneven, so
An uneven force acts on the side surface of the point 25, causing the bar 24 to be bent and drilled, resulting in an uneven thickness, and once the uneven thickness occurs, it becomes difficult to process the raw pipe later. and also make it difficult to obtain a desirable final product. On the other hand, in the expansion method, a pilot hole 26 is drilled in the billet 23 in advance as shown in FIG. Since the pilot holes 26 are drilled in advance, uneven thickness can be reduced compared to the direct drilling method, but the pilot holes 26 are formed by machining each billet 23 one by one. Since this is necessary, there is a disadvantage that the cost is high and the yield is also reduced.

本発明は、上記したような実情に鑑み検討を重
ねて創案されたものである。即ち、本発明者等が
上記したような直接穿孔法によるものについて前
記バー24に歪ゲージを貼り、バー24の曲り歪
引張方向pと偏肉方法との関係を70φ×280mmの
ものを目標肉厚17.5mmの素管とする場合について
測定した結果は第3図に示す通りであつて、これ
らの両者間に有意な対応関係にあることが確認さ
れ、又同様の関係は肉厚においてそれなりに減少
するとしても前記エキスパンシヨン法の場合にお
いても確認された。そこで、本発明においては上
記したような熱間押出し用穿孔ビレツトを製造す
るに当つて、そのプレス穿孔時にバーの曲りを真
直状にする力を附加し被加工ビレツトに偏肉の発
生するのを防止することを提案するものであつ
て、穿孔機本体に設けたバーの軸心と直角方向に
出没するバー押体により上記のようなバーの曲り
を真直状として直接穿孔法又はエキスパンシヨン
法を実施するものである。
The present invention was created after repeated studies in view of the above-mentioned circumstances. That is, the present inventors applied a strain gauge to the bar 24 using the direct drilling method described above, and determined the relationship between the bending strain tensile direction p of the bar 24 and the thickness unevenness method to determine the target thickness of the bar 24 of 70φ x 280 mm. The measurement results for the case of a 17.5 mm thick raw pipe are as shown in Figure 3, and it was confirmed that there is a significant correspondence between the two, and the same relationship is also found in the wall thickness. Even though it decreased, it was also confirmed in the case of the expansion method. Therefore, in the present invention, when manufacturing a perforated billet for hot extrusion as described above, a force is applied to straighten the bend of the bar during press perforation to prevent uneven thickness from occurring in the billet to be processed. This method is proposed to prevent the bending of the bar as described above by straightening it using a bar pusher that protrudes and retracts in a direction perpendicular to the axis of the bar provided on the main body of the punching machine, and uses a direct drilling method or an expansion method. The purpose is to implement the following.

これを具体的に添付図面に示すものについて説
明すると、第4図に示すようにケース2にビレツ
ト3を入れ直接穿孔法又はエキスパンシヨン法を
実施するときに、そのバー4が曲つたならば、そ
の曲げの引張り側が厚肉部3aとなり、圧縮側が
薄肉部3bとなるものと認められ、このことから
バー4の周面に歪ゲージ6を3カ所以上略等間隔
に貼布して前記の穿孔加工をなした場合の最大引
張歪発生方向を検知し、該歪量とバー先端の変位
との、関係をベースとしてバー4に矯正力を与
え。このようにバー4に矯正力を与える方法とし
ては第5図に示すように油圧シリンダー7の押圧
体8によつてバー4にその軸心と直角方向の押圧
力を与え、或いは第6図と第7図に示すようにバ
ー4の内部に複数の油圧孔9を形成し、この油圧
孔に対する圧力油の圧力調整によつてその曲りを
矯正する方法がある。
To explain this specifically with reference to what is shown in the attached drawings, if the billet 3 is placed in the case 2 and the direct drilling method or expansion method is performed as shown in FIG. 4, if the bar 4 is bent. It is recognized that the tension side of the bending becomes the thick part 3a, and the compression side becomes the thin part 3b.From this, three or more strain gauges 6 are pasted at approximately equal intervals on the circumferential surface of the bar 4, and the above-mentioned The direction in which the maximum tensile strain occurs when drilling is performed is detected, and a correction force is applied to the bar 4 based on the relationship between the amount of strain and the displacement of the tip of the bar. As a method of applying a straightening force to the bar 4 in this way, as shown in FIG. As shown in FIG. 7, there is a method in which a plurality of hydraulic holes 9 are formed inside the bar 4, and the curvature is corrected by adjusting the pressure of pressure oil with respect to the hydraulic holes.

斯かる本発明の装置についての全般的な構成関
係は別に第8図と第9図に示す通りであつて、上
記したような各油圧シリンダー7は設定台15に
対して第9図に示すようにバー4の円周方向にお
いて等間隔に設けら、上記設定台15はアウター
シリンダー12によつて押圧され、該設定台15
とビレツト3との間にはアプセツト用ステム13
が介装される。又、設定台15上にはガイド14
が設けられてインナーシリンダー11によつて圧
下されるバー4を案内し上記したようなポイント
5による加工を行わしめるように成つている。
The overall structural relationship of the device of the present invention is separately shown in FIGS. 8 and 9, and each hydraulic cylinder 7 as described above is connected to the setting table 15 as shown in FIG. The setting tables 15 are provided at equal intervals in the circumferential direction of the bar 4, and are pressed by the outer cylinder 12.
and billet 3 is an upset stem 13.
is interposed. Also, a guide 14 is placed on the setting table 15.
is provided so as to guide the bar 4 which is pressed down by the inner cylinder 11 and perform the machining at the point 5 as described above.

又、このような構成のものにおける制御シーケ
ンスは第10図に示す通りで、バー4の先端側に
歪ゲージ6を3枚以上貼着し、これらの歪ゲージ
6からの配線を適宜にバー4に設けられた溝によ
つてバー4の基端側に導いてから外部に取出し歪
測定器16によつて、夫々の歪ゲージによつて得
られた歪量を増幅し、その信号ε,ε,ε
……を計算機17に入れるように成つており、計
算機17においては先ず得られた各歪量からバー
4の曲りの方向とその大きさを計算する。又、該
計算機17では予め計算された各油圧とバー4先
端の変位との関係に基き各油圧シリンダー7に対
する必要な圧力を計算し、それによる信号p1
p2,p3を油圧制御機構18に送り、各油圧シリン
ダー7の発生圧力を制御する。
The control sequence for such a configuration is as shown in FIG. 10, in which three or more strain gauges 6 are attached to the tip side of the bar 4, and the wiring from these strain gauges 6 is connected to the bar 4 as appropriate. The strain amount obtained by each strain gauge is amplified by the strain measuring device 16 which is guided to the base end side of the bar 4 through a groove provided in the bar 4 and taken out to the outside, and the resulting signal ε 1 , ε 2 , ε 3
... is input into the computer 17, and the computer 17 first calculates the direction of bending of the bar 4 and its magnitude from each obtained strain amount. Further, the computer 17 calculates the necessary pressure for each hydraulic cylinder 7 based on the relationship between each oil pressure calculated in advance and the displacement of the tip of the bar 4, and the resulting signals p 1 ,
p 2 and p 3 are sent to the hydraulic control mechanism 18 to control the pressure generated in each hydraulic cylinder 7.

上記したような必要圧力は、前記のような歪値
より変位量を計算する過程と、矯正に必要な油圧
力を計算する過程とによつて得られ、これらの各
計算は以下の如くである。
The required pressure as described above is obtained by the process of calculating the amount of displacement from the strain value as described above and the process of calculating the hydraulic pressure required for correction, and each of these calculations is as follows. .

歪値より先端変位量の計算 主歪方向の表面歪をεgとすると、その表面応
力σgは次の式で求められる。
Calculation of tip displacement amount from strain value If the surface strain in the principal strain direction is εg, the surface stress σg can be obtained by the following formula.

σg=εg・E …… 又歪ゲージ測定位置での曲げモーメントMgは
次の,式によつて求められる。
σg=εg・E...The bending moment Mg at the strain gauge measurement position can be determined by the following formula.

Mg=σg・Z=εg・E・Z …… 但しZ:断面係数(丸棒の場合はZ=π/32D3 Mg=Wp・lg …… 但しWpはバー先端の曲げ作用力、lgはバー先
端から歪ゲージ測定位置までの距離。
Mg=σg・Z=εg・E・Z... However, Z: Section modulus (Z=π/ 32D in the case of a round bar. Distance from the tip to the strain gauge measurement position.

,式より前記Wpは次の式のようにな
る。
, the above Wp becomes as follows.

Wp=εg・E・Z/lg …… 更にバー先端のガイド部中心位置からの変位量
Xpは次のV式のようになる。
Wp=εg・E・Z/lg …… Furthermore, the amount of displacement of the tip of the bar from the center position of the guide part
Xp becomes as shown in the following V formula.

Xp=Wpl/3E 但し、lはガイド部までの距離、:断面二次
モーメントで丸棒の場合は=π/64D4である。
Xp=Wpl 3 /3E However, l is the distance to the guide part, and the second moment of area is = π/64D 4 in the case of a round bar.

矯正に必要な油圧力W0の計算 矯正する油圧力W0によるバー先端変位量X0
次の式ようになる。
Calculating the hydraulic pressure W 0 required for straightening The amount of bar tip displacement X 0 due to the hydraulic pressure W 0 for straightening is given by the following formula.

X0=W /3E(1+3l/2l)……
但しl1はバー先端から押圧シリンダー押圧体8
までの距離、l2はこの押圧体8とガイド14との
距離である。
X 0 = W 0 l 2 3 /3E (1+3l 1 /2l 2 )...
However, l 1 is a pressing cylinder pressing body 8 from the tip of the bar.
The distance l 2 is the distance between this pressing body 8 and the guide 14.

そこで前記Xp=X0となるようにW0を定めるに
は、 W0=2l・Wp/l (3l+2l) となり、従つて、 W0=2l・εg・E・Z/l (3l+2l
)lg となつてεgからW0を求めることができる。
Therefore , in order to determine W 0 so that Xp = /l 2 2 (3l 1 +2l 2
)lg, and W 0 can be found from εg.

本発明によるものの具体的な実施例について本
発明によらない従来法のものと比較して示してい
るのが第11図であつて、332φ×850mmで目標肉
厚を62mmとしたホローピース(素管)を直接穿孔
法によつて得るに当つて従来法によるものの最大
偏肉率は第11図に点線を以て示す通りであり、
5%〜20%の範囲にばらつき、10〜12.5%の範囲
内にピーク点があつて10%以内は30%程度である
ものであるのに対し、本発明によるものは該図の
実線で示すようになり、即ち最大偏肉率が10%以
下となり、ピーク点は2.5〜5%であつて、70%
以上が5%以内となることが確認され、著しい改
善効果を得ることができた。
Fig. 11 shows a concrete example of the present invention in comparison with a conventional method not based on the present invention. ) by the direct drilling method, the maximum thickness unevenness by the conventional method is as shown by the dotted line in Figure 11,
The variation ranges from 5% to 20%, the peak point is within the range of 10% to 12.5%, and the range within 10% is about 30%, whereas the one according to the present invention is shown by the solid line in the figure. In other words, the maximum thickness deviation rate is 10% or less, the peak point is 2.5 to 5%, and the maximum thickness is 70%.
It was confirmed that the above ratio was within 5%, and a significant improvement effect could be obtained.

以上説明したような本発明によるときは、この
種穿孔ビレツトにおいてその偏肉発生を大幅に縮
減せしめ、工程及び作業能率などからして有利な
直接穿孔法によつても好ましい素管を得しめ、エ
キスパンシヨン法においては偏肉発生の殆んどな
い素管を提供し、従つてその後の圧延成形加工を
頗る容易且つ円滑となし、又適正な製品を提供し
得るものであつて、工業的にその効果の大きい発
明である。
According to the present invention as explained above, it is possible to significantly reduce the occurrence of uneven thickness in this type of perforated billet, and to obtain a preferable raw pipe even by the direct perforation method, which is advantageous from the viewpoint of process and work efficiency, The expansion method provides a raw tube with almost no thickness deviation, which makes the subsequent rolling process very easy and smooth, and provides a suitable product, making it suitable for industrial use. This is a highly effective invention.

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

図面は、本発明の技術的内容を示すものであつ
て、第1図は直接穿孔法の概要を示した説明図、
第2図はエキスパンシヨン法の説明図、第3図は
直接穿孔法によるバーの曲り歪引張方向と偏肉方
向との関係を示した説明図、第4図は、本発明に
よる歪ゲージ貼布要領の説明図、第5図はその矯
正手法の1例を示した説明図、第6図はその別の
態様を示した説明図、第7図は第6図…線に
そつた断面図、第8図は、本発明による装置の全
般的な関係を示した縦断側面図、第9図はその矯
正機構部分の横断面図、第10図は、その制御シ
ーケンスの説明図、第11図は従来法によるもの
と本発明によるものの最大偏肉率について示した
図表である。 然して、これらの図面において、3はビレツ
ト、4はバー、5はポイント、6は歪ゲージ、7
は油圧シリンダー、8は押圧体、11はインナー
シリンダー、12はアウターシリンダー、13は
アプセツト用ステム、14はガイド、16は歪測
定器、17は計算機、18は油圧制御機構を示す
ものである。
The drawings show the technical contents of the present invention, and FIG. 1 is an explanatory diagram showing an overview of the direct drilling method;
Fig. 2 is an explanatory diagram of the expansion method, Fig. 3 is an explanatory diagram showing the relationship between the bending strain tensile direction and the thickness unevenness direction of the bar by the direct drilling method, and Fig. 4 is a diagram showing the strain gauge pasting according to the present invention. An explanatory diagram of the cloth procedure, Fig. 5 is an explanatory diagram showing one example of the correction method, Fig. 6 is an explanatory diagram showing another aspect thereof, and Fig. 7 is a sectional view along the line of Fig. 6. , FIG. 8 is a vertical sectional side view showing the general relationship of the device according to the present invention, FIG. 9 is a cross sectional view of the correction mechanism portion thereof, FIG. 10 is an explanatory diagram of its control sequence, and FIG. 11 is a chart showing the maximum thickness unevenness ratio of the conventional method and that of the present invention. Therefore, in these drawings, 3 is a billet, 4 is a bar, 5 is a point, 6 is a strain gauge, and 7 is a bar.
1 is a hydraulic cylinder, 8 is a pressing body, 11 is an inner cylinder, 12 is an outer cylinder, 13 is an upset stem, 14 is a guide, 16 is a strain measuring device, 17 is a computer, and 18 is a hydraulic control mechanism.

Claims (1)

【特許請求の範囲】 1 熱間押出し用穿孔ビレツトを得るに当つて穿
孔時におけるバーの曲りを該バーに設けた検出手
段によつて検出し、この値より求められた作用力
を該バーに配設した押圧手段によつて前記バーに
附与しつつ穿孔せしめ、穿孔ビレツトにおける偏
肉発生を防止することを特徴とする熱間押出し用
穿孔ビレツトの偏肉発生防止方法。 2 穿孔機本体にビレツトを穿孔するように設け
られたバーにその穿孔時における曲りを測定する
検出手段を配設し、該検出手段による測定結果に
よつて前記バーに対し押圧力を作用せしめる押圧
手段を配設し、これら押圧手段による押圧作用に
より穿孔時におけるバーの曲りを真直状態に矯正
するようにしたことを特徴とする熱間押出し用穿
孔ビレツトの偏肉発生防止装置。
[Claims] 1. In obtaining a perforated billet for hot extrusion, the bending of the bar during perforation is detected by a detection means provided on the bar, and an acting force determined from this value is applied to the bar. A method for preventing uneven thickness of a perforated billet for hot extrusion, characterized in that the bar is perforated while being applied to the bar by a disposed pressing means to prevent uneven thickness of the perforated billet. 2. A bar provided to drill a billet in the drilling machine body is provided with a detection means for measuring the bending during drilling, and a pressing force is applied to the bar based on the measurement result by the detection means. 1. A device for preventing uneven thickness of a perforated billet for hot extrusion, characterized in that means are provided, and the bending of the bar during perforation is corrected to a straight state by the pressing action of the pressing means.
JP606882A 1982-01-20 1982-01-20 Method and device for preventing generation of wall thickness deviation of billet to be pierced in hot extrusion Granted JPS58125313A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP606882A JPS58125313A (en) 1982-01-20 1982-01-20 Method and device for preventing generation of wall thickness deviation of billet to be pierced in hot extrusion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP606882A JPS58125313A (en) 1982-01-20 1982-01-20 Method and device for preventing generation of wall thickness deviation of billet to be pierced in hot extrusion

Publications (2)

Publication Number Publication Date
JPS58125313A JPS58125313A (en) 1983-07-26
JPS6157096B2 true JPS6157096B2 (en) 1986-12-05

Family

ID=11628258

Family Applications (1)

Application Number Title Priority Date Filing Date
JP606882A Granted JPS58125313A (en) 1982-01-20 1982-01-20 Method and device for preventing generation of wall thickness deviation of billet to be pierced in hot extrusion

Country Status (1)

Country Link
JP (1) JPS58125313A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7364875B2 (en) * 2019-09-25 2023-10-19 日本製鉄株式会社 Press drilling machine and seamless pipe manufacturing method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS495827A (en) * 1972-05-11 1974-01-19
JPS5117166A (en) * 1974-08-01 1976-02-10 Nippon Steel Corp PURESUROORUSENKOHONIOKERU HENNIKUKENCHIHOHO

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS495827A (en) * 1972-05-11 1974-01-19
JPS5117166A (en) * 1974-08-01 1976-02-10 Nippon Steel Corp PURESUROORUSENKOHONIOKERU HENNIKUKENCHIHOHO

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JPS58125313A (en) 1983-07-26

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