JPH0118970B2 - - Google Patents
Info
- Publication number
- JPH0118970B2 JPH0118970B2 JP332783A JP332783A JPH0118970B2 JP H0118970 B2 JPH0118970 B2 JP H0118970B2 JP 332783 A JP332783 A JP 332783A JP 332783 A JP332783 A JP 332783A JP H0118970 B2 JPH0118970 B2 JP H0118970B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- heating
- heating device
- pipe
- heat
- 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
- 238000010438 heat treatment Methods 0.000 claims description 52
- 238000005452 bending Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 230000002500 effect on skin Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
本発明は金属管の内面を連続的に熱処理すると
共に曲げ加工し、曲管部及びその前後の直管部に
同一の熱処理が施された曲管を製造する方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a bent tube in which the inner surface of a metal tube is continuously heat-treated and bent, and the bent tube portion and the straight tube portions before and after the bent tube portion are subjected to the same heat treatment. It is something.
コンクリート輸送用の配管に用いる曲管は、コ
ンクリートの輸送時曲管部にコンクリートが強く
当るため、該曲管部に熱処理が施されていない
と、該部が短時間に摩耗して損傷するおそれがあ
り、また、曲管部前後の直管部にも前記の摩耗が
起ることは永年の経験で確認されている。従つ
て、曲管部及びその前後の直管部の内面に連続的
に熱処理の施された曲管が得られればコンクリー
ト等の輸送用配管に用いる曲管として極めて有用
である。 Bent pipes used for concrete transportation piping are subject to strong contact with the bent pipe during concrete transportation, so if the bent pipe is not heat treated, there is a risk of wear and damage in a short period of time. Moreover, it has been confirmed through many years of experience that the above-mentioned wear also occurs in the straight pipe sections before and after the bent pipe section. Therefore, if a curved pipe in which the inner surface of the curved pipe part and the straight pipe parts before and after the bent pipe part are continuously heat-treated can be obtained, it will be extremely useful as a bent pipe for use in pipes for transporting concrete and the like.
本発明は上記のような事情を背景とし、曲管部
及びその前後の直管部の内面に連続的に熱処理の
施された熱処理曲管を製造する方法を提供するこ
とを目的としてなされたもので、その構成は、金
属管を高周波誘導子から成る加熱装置により狭幅
の環状帯域に加熱しながら該加熱帯域を加熱の直
後冷却するようにすると共に前記加熱帯域を前記
管の長手方向に徐々に移動させつつ該帯域に曲げ
モーメントを作用させて曲げ加工する方法におい
て、前記加熱装置を管の内部に該管の軸方向に移
動可能とし、前記加熱装置を管の曲げられる部分
より適宜距離前に配し、管を固定したまま前記加
熱装置を後退させ乍ら管内面を加熱すると共に加
熱帯域を加熱の直後冷却して管の一方の直管部に
熱処理を施した後、前記加熱装置を停止すると共
に管を前進させ乍ら該管に曲げモーメントを付与
して曲げ加工すると同時に熱処理を施し、つい
で、管の前進を停止し、前記加熱装置を適宜距離
後退させて他方の直管部に熱処理を施することを
特徴とするものである。 The present invention has been made against the background of the above-mentioned circumstances, and has been made for the purpose of providing a method for manufacturing a heat-treated bent pipe in which the inner surfaces of the bent pipe part and the straight pipe parts before and after the bent pipe part are continuously heat-treated. The configuration is such that a metal tube is heated into a narrow annular zone by a heating device made of a high-frequency inductor, and the heating zone is cooled immediately after heating, and the heating zone is gradually heated in the longitudinal direction of the tube. In this method, the heating device is movable inside the tube in the axial direction of the tube, and the heating device is placed an appropriate distance in front of the bendable portion of the tube. The inner surface of the tube is heated while the heating device is retracted while the tube is fixed, and the heating zone is cooled immediately after heating to heat-treat one straight section of the tube, and then the heating device is At the same time as the tube is stopped, the tube is moved forward while a bending moment is applied to the tube, and the tube is bent and heat treated at the same time.Then, the forward movement of the tube is stopped and the heating device is moved back an appropriate distance to apply a bending moment to the other straight tube section. It is characterized by being subjected to heat treatment.
次に本発明方法の実施の一例を図に拠り説明す
る。 Next, an example of implementing the method of the present invention will be explained with reference to the drawings.
図は本発明方法を実施するための装置の一例
で、
１は曲げ加工すべき管、２は該管１の先端部又
は中間適宜の個所を把持するクランプ３を具えた
回転自在の曲げ腕、４は該曲げ腕２の回転軸、
５，５，６，６は管１を案内するための上下に連
動可能な案内ローラ、７は管１を推進する装置の
管端部支持台、８は外径が管１の内径より小さく
冷却装置９を一体に設けた環状の高周波誘導子か
ら成る加熱装置、１０は該加熱装置８と冷却水供
給管（図示せず）及び電線（図示せず）を挿入し
た槍、１１は前記加熱装置８と槍１０を支持する
ためのフレーム、１２は該フレーム１１の前後に
90度離隔して４個ずつ取附けた車輪であり、本発
明方法の実施に際しては、加熱装置８により管１
をその内側から狭幅の環状に加熱し、加熱の直後
加熱帯域を冷却するようになつている。 The figure shows an example of an apparatus for carrying out the method of the present invention, in which 1 is a tube to be bent, 2 is a rotatable bending arm equipped with a clamp 3 for gripping the tip or an appropriate point in the middle of the tube 1; 4 is the rotation axis of the bending arm 2;
5, 5, 6, and 6 are guide rollers that can be moved up and down to guide the tube 1; 7 is a tube end support stand of a device that propels the tube 1; and 8 is a cooling device whose outer diameter is smaller than the inner diameter of the tube 1. A heating device consisting of an annular high-frequency inductor integrally provided with a device 9, 10 a spear into which the heating device 8, a cooling water supply pipe (not shown) and an electric wire (not shown) are inserted, and 11 a heating device 8 and a frame for supporting the spear 10; 12 is located at the front and rear of the frame 11;
Four wheels are attached at 90 degrees apart, and when carrying out the method of the present invention, a heating device 8 is used to heat the pipe 1.
is heated from the inside in a narrow annular shape, and the heating zone is cooled immediately after heating.
而して、本発明方法を実施するには、まず、図
示のように、管１を案内ローラ５，５，６，６を
通してその先端部を曲げ腕２上のクランプ３に把
持せしめ、該管１の中に加熱装置８を挿入するの
であるが、この加熱装置８は曲管部となるべき部
の前の直管部を熱処理するために、管１の曲げ始
め点であるＢ点より適宜距離l1だけ前方のＡ点に
位置させて段取りを完了する。次いで、加熱装置
８に高周波電流を通して管１のＡ点が熱処理可能
温度に達したら、冷却装置９から冷却水を出し乍
ら該加熱装置８を徐々に後退（図の左方へ）させ
ることにより曲管部前方の直管部に熱処理を施し
て行き、該加熱装置８が距離l1移動してＢ点に達
したら、その移動を停止すると同時に管端部支持
台７に推力を加えて管１を徐々に移動（図の右方
へ）させ、曲げを開始するが、この曲げの開始
後、直ちに上下に連動する案内ローラ５，５，
６，６で管１の真円を修正する。こうして、所定
の曲げを行なうことにより曲げと同時に熱処理が
行われるのであつて、この曲げが完了したら、管
１の移動を停止すると同時に加熱装置８を後退さ
せ、曲管部に続く直管部の熱処理を行なうのであ
り、加熱装置８が距離l2移動してＣ点に達した
ら、高周波電流及び冷却水の供給を止める。 To carry out the method of the present invention, first, as shown in the figure, the tube 1 is passed through the guide rollers 5, 5, 6, 6, and its tip is held by the clamp 3 on the bending arm 2. A heating device 8 is inserted into the pipe 1, and in order to heat-treat the straight pipe section in front of the section that should become the bent pipe section, the heating device 8 is inserted into the pipe 1 from point B, which is the starting point of bending the pipe 1. Complete the setup by positioning it at point A a distance l1 ahead. Next, when a high-frequency current is passed through the heating device 8 and the point A of the tube 1 reaches a temperature that allows heat treatment, the heating device 8 is gradually retreated (toward the left in the figure) while cooling water is discharged from the cooling device 9. Heat treatment is applied to the straight pipe section in front of the bent pipe section, and when the heating device 8 moves a distance l 1 and reaches point B, it stops moving and at the same time applies thrust to the pipe end support 7 to tighten the pipe. 1 is gradually moved (toward the right side of the figure) to start bending. Immediately after the start of this bending, the guide rollers 5, 5, which are interlocked up and down.
Correct the perfect circle of tube 1 in steps 6 and 6. In this way, by performing a predetermined bending, heat treatment is performed at the same time as the bending, and when this bending is completed, the movement of the tube 1 is stopped and the heating device 8 is moved backward at the same time, and the straight pipe section following the bent section is Heat treatment is performed, and when the heating device 8 moves a distance l 2 and reaches point C, the supply of high frequency current and cooling water is stopped.
以上の操作を行なうことにより曲管部及びその
前後の直管部に連続的に熱処理の施された曲管が
製造されるのであるが、その操作上重要なことは
管１と加熱装置８との相対速度を常に一定に保つ
ことであつて、こうすることにより曲管部と両直
管部共に焼継ぎなどのない均一な熱処理曲管が得
られると共に、加熱装置の移動を加減することに
よつて曲げ加工時に曲率半径の急激な変化を避け
ることができる。 By performing the above operations, a bent pipe is manufactured in which the bent pipe part and the straight pipe parts before and after the bent pipe part are continuously heat-treated. By doing so, a uniformly heat-treated curved pipe with no burn joints can be obtained in both the curved pipe section and both straight pipe sections, and the movement of the heating device can be controlled. Therefore, sudden changes in the radius of curvature can be avoided during bending.
一般に、単なる熱処理であれば、管の加熱は外
面から行なうのが普通であり、その方が加熱用の
高周波誘導子が簡単になるのであるが、本発明に
おいて、あえて内面からの加熱を採用したのは、
高い周波数を用いて表皮効果により管の内面を優
先的に加熱し、外面をあまり硬化させずに内面を
充分硬化させるためであつて、この内面からの加
熱は、また、管外部に障害がないため、管をクラ
ンプしたまま、その全長に亘り加熱装置を移動す
ることができ、従つて、直管部を含めた管の全長
に亘つて均一な連続熱処理を施し易いし、更にク
ランプの開閉を加減することにより曲管部前部の
直管部の熱処理部分の長さを変えることも可能で
ある。 Generally, in the case of simple heat treatment, the tube is heated from the outside, which makes it easier to use a high-frequency inductor for heating, but in the present invention, heating from the inside is purposely adopted. The thing is,
This is done by using high frequency to preferentially heat the inner surface of the tube due to the skin effect, and sufficiently harden the inner surface without hardening the outer surface too much.This heating from the inner surface also causes no damage to the outside of the tube. Therefore, the heating device can be moved along the entire length of the pipe while the pipe is clamped, making it easy to perform uniform continuous heat treatment over the entire length of the pipe, including straight pipe sections. It is also possible to change the length of the heat-treated portion of the straight pipe section at the front of the curved pipe section by adjusting the length.
本発明は上述の通りであつて、本発明方法によ
れば、曲管部及びその前後の直管部の内面に均一
な熱処理の施された曲管を容易に製造することが
でき、また本発明方法により製造された曲管は、
前述のように、その曲管部及びその前後の直管部
が摩耗しにくいので、コンクリート輸送用配管に
用いる曲管として好適である。 The present invention is as described above, and according to the method of the present invention, it is possible to easily manufacture a curved pipe in which the inner surfaces of the curved pipe portion and the straight pipe portions before and after the curved pipe portion are uniformly heat-treated. The bent pipe manufactured by the invented method is
As mentioned above, the bent pipe part and the straight pipe parts before and after the bent pipe part are hard to wear, so it is suitable as a bent pipe for use in concrete transportation piping.
第１図は本発明方法の一例を示す平面図、第２
図は本発明方法により製造された曲管の一例の断
面図、第３図は本発明方法における管と加熱装置
の移動関係を示す図表である。
１……管、２……曲げ腕、３……クランプ、４
……回転軸、５，６……案内ローラ、７……管端
部支持台、８……加熱装置、９……冷却装置、１
０……槍、１１……フレーム。
Figure 1 is a plan view showing an example of the method of the present invention, Figure 2 is a plan view showing an example of the method of the present invention;
The figure is a sectional view of an example of a curved tube manufactured by the method of the present invention, and FIG. 3 is a chart showing the movement relationship between the tube and the heating device in the method of the present invention. 1...Pipe, 2...Bending arm, 3...Clamp, 4
... Rotating shaft, 5, 6 ... Guide roller, 7 ... Pipe end support stand, 8 ... Heating device, 9 ... Cooling device, 1
0... Spear, 11... Frame.
Claims (1)
り狭幅の環状帯域に加熱しながら該加熱帯域を加
熱の直後冷却するようにすると共に前記加熱帯域
を前記管の長手方向に徐々に移動させつつ該帯域
に曲げモーメントを作用させて曲げ加工する方法
において、前記加熱装置を管の内部に該管の軸方
向に移動可能とし、前記加熱装置を管の曲げられ
る部分より適宜距離前に配し、管を固定したまま
前記加熱装置を後退させ乍ら管内面を加熱すると
共に加熱帯域を加熱の直後冷却して管の一方の直
管部に熱処理を施した後、前記加熱装置を停止す
ると共に管を前進させ乍ら該管に曲げモーメント
を付与して曲げ加工すると同時に熱処理を施し、
ついで、管の前進を停止し、前記加熱装置を適宜
距離後退させて他方の直管部に熱処理を施すこと
を特徴とする熱処理曲管の製造方法。1. While heating a metal tube into a narrow annular zone with a heating device consisting of a high-frequency inductor, the heating zone is cooled immediately after heating, and the heating zone is gradually moved in the longitudinal direction of the tube. In the method of bending by applying a bending moment to the zone, the heating device is movable in the axial direction of the tube inside the tube, the heating device is placed an appropriate distance in front of the bendable portion of the tube, and While fixing the heating device, the inner surface of the tube is heated while the heating zone is cooled immediately after heating, and one straight section of the tube is heat-treated, and then the heating device is stopped and the tube is While moving the tube forward, a bending moment is applied to the tube to bend it, and at the same time heat treatment is performed,
A method for manufacturing a heat-treated curved pipe, characterized in that the forward movement of the pipe is then stopped, and the heating device is moved back an appropriate distance to heat-treat the other straight pipe section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP332783A JPS59129727A (en) | 1983-01-14 | 1983-01-14 | Production of heat treated bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP332783A JPS59129727A (en) | 1983-01-14 | 1983-01-14 | Production of heat treated bent pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59129727A JPS59129727A (en) | 1984-07-26 |
| JPH0118970B2 true JPH0118970B2 (en) | 1989-04-10 |
Family
ID=11554256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP332783A Granted JPS59129727A (en) | 1983-01-14 | 1983-01-14 | Production of heat treated bent pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59129727A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61117223A (en) * | 1984-11-14 | 1986-06-04 | Nippon Kokan Kk <Nkk> | Method for manufacturing bent pipe with high toughness welded metal part |
| AT390743B (en) * | 1988-09-16 | 1990-06-25 | Voest Alpine Stahl Donawitz | METHOD FOR THE PRODUCTION OF WINDING LAYER TUBES |
| GB2527187B (en) * | 2013-08-09 | 2016-08-03 | Pipeline Induction Heat Ltd | A vehicle for induction heating a bent pipeline section |
-
1983
- 1983-01-14 JP JP332783A patent/JPS59129727A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59129727A (en) | 1984-07-26 |
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